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Background and purpose: Several studies have demonstrated anti-proliferative and pro-apoptotic actions of cannabinoids on various tumours, together with their anti-angiogenic properties. The non-psychoactive cannabinoid cannabidiol (CBD) effectively inhibits the growth of different types of tumours in vitro and in vivo and down-regulates some pro-angiogenic signals produced by glioma cells. As its anti-angiogenic properties have not been thoroughly investigated to date, and given its very favourable pharmacological and toxicological profile, here, we evaluated the ability of CBD to modulate tumour angiogenesis. Experimental approach: Firstly, we evaluated the effect of CBD on human umbilical vein endothelial cell (HUVEC) proliferation and viability - through [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay and FACS analysis - and in vitro motility - both in a classical Boyden chamber test and in a wound-healing assay. We next investigated CBD effects on different angiogenesis-related proteins released by HUVECs, using an angiogenesis array kit and an ELISA directed at MMP2. Then we evaluated its effects on in vitro angiogenesis in treated HUVECs invading a Matrigel layer and in HUVEC spheroids embedded into collagen gels, and further characterized its effects in vivo using a Matrigel sponge model of angiogenesis in C57/BL6 mice. Key results: CBD induced HUVEC cytostasis without inducing apoptosis, inhibited HUVEC migration, invasion and sprouting in vitro, and angiogenesis in vivo in Matrigel sponges. These effects were associated with the down-modulation of several angiogenesis-related molecules. Conclusions and implications: This study reveals that CBD inhibits angiogenesis by multiple mechanisms. Its dual effect on both tumour and endothelial cells supports the hypothesis that CBD has potential as an effective agent in cancer therapy.
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RESEARCH PAPERbph_2050 1218..1231
Cannabidiol inhibits
angiogenesis by multiple
M Solinas1*, P Massi2*, AR Cantelmo3*, MG Cattaneo2*, R Cammarota3*,
D Bartolini3, V Cinquina1, M Valenti1, LM Vicentini2, DM Noonan4,
A Albini3** and D Parolaro1**
1Department of Biomedical, Computer and Communication Sciences, University of Insubria,
Busto Arsizio (VA), Italy, 2Department of Pharmacology, Chemotherapy and Toxicology,
University of Milan, Milan, Italy, 3Oncology Research Laboratory, Science and Technology Park,
IRCCS MultiMedica, Milan, Italy, and 4Department of Biotechnology and Life Sciences,
University of Insubria, Varese, Italy
Daniela Parolaro, Department of
Biomedical, Computer and
Communication Sciences, Centre
of Neuroscience, University
of Insubria, Busto Arsizio
(VA) 21052, Italy. E-mail:
*These authors equally
contributed to the work.
**These authors share the
cannabidiol; angiogenesis;
HUVEC; migration; invasion;
tube formation
6 December 2011
16 May 2012
21 May 2012
Several studies have demonstrated anti-proliferative and pro-apoptotic actions of cannabinoids on various tumours,
together with their anti-angiogenic properties. The non-psychoactive cannabinoid cannabidiol (CBD) effectively inhibits
the growth of different types of tumours in vitro and in vivo and down-regulates some pro-angiogenic signals produced
by glioma cells. As its anti-angiogenic properties have not been thoroughly investigated to date, and given its very
favourable pharmacological and toxicological profile, here, we evaluated the ability of CBD to modulate tumour
Firstly, we evaluated the effect of CBD on human umbilical vein endothelial cell (HUVEC) proliferation and viability – through
[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay and FACS analysis – and in vitro motility – both in a
classical Boyden chamber test and in a wound-healing assay. We next investigated CBD effects on different angiogenesis-
related proteins released by HUVECs, using an angiogenesis array kit and an ELISA directed at MMP2. Then we evaluated its
effects on in vitro angiogenesis in treated HUVECs invading a Matrigel layer and in HUVEC spheroids embedded into collagen
gels, and further characterized its effects in vivo using a Matrigel sponge model of angiogenesis in C57/BL6 mice.
CBD induced HUVEC cytostasis without inducing apoptosis, inhibited HUVEC migration, invasion and sprouting in vitro, and
angiogenesis in vivo in Matrigel sponges. These effects were associated with the down-modulation of several angiogenesis-
related molecules.
This study reveals that CBD inhibits angiogenesis by multiple mechanisms. Its dual effect on both tumour and endothelial cells
supports the hypothesis that CBD has potential as an effective agent in cancer therapy.
ET-1,endothelin-1;HUVECs,human umbilical vein endothelial cells;PDGF-AA,platelet-derived growth factor-AA;
TIMP1,tissue inhibitor of metalloproteinases 1;uPA,urokinase-type plasminogen activator
BJP British Journal of
1218 British Journal of Pharmacology (2012) 167 1218–1231 © 2012 The Authors
British Journal of Pharmacology © 2012 The British Pharmacological Society
Several studies have demonstrated that cannabinoids exert an
inhibitory action on the proliferation of various cancer cell
lines, and are able to slow down or arrest the growth of
different models of tumour xenograft in experimental animals
(for review see Flygare and Sander, 2008; Alexander et al.,
2009; Freimuth et al., 2010; Guindon and Hohmann, 2011).
These data have attracted increasing interest for clinical
exploitation of cannabinoid-based anti-cancer therapies.
Recently, in addition to their anti-proliferative and pro-
apoptotic actions, it has been shown that cannabinoids can
affect other important processes in tumourigenesis, in par-
ticular angiogenesis. Angiogenesis, the formation of new
blood vessels from the pre-existing ones, represents an essen-
tial part of tumour growth, invasion and metastasis and con-
stitutes a therapeutic target for cancer therapy. Diverse
complex cellular actions are implicated in angiogenesis, such
as extracellular matrix degradation, migration and prolifera-
tion of endothelial cells, morphological differentiation of
endothelial cells to form tubes. All of these processes require
a finely tuned balance between stimulating and inhibitory
signals. Stimulating signals include growth factors, such as
VEGF, integrins, angiopoietins, chemokines, as well as other
factors (Folkman, 2007; Chung et al., 2010). Molecules induc-
ing inhibitory signals include thrombospondin, interferons
and other cytokines as well as other endogenous angiogenesis
inhibitory factors, which may target endothelial cells either
directly or indirectly (Noonan et al., 2008; 2011a; Albini et al.,
2009; 2010).
Cannabinoids that bind to the CB1and/or CB2cannabi-
noid receptors (WIN5512-2, HU210, JWH133 and THC) have
been reported to inhibit vascular endothelial cell survival
and migration (Blázquez et al., 2003) as part of their
anti-angiogenic action. Treatment with these cannabinoids
reduces vascular density in experimental tumours (Blázquez
et al., 2003; 2006; Casanova et al., 2003; Portella et al., 2003;
Preet et al., 2008). Met-fluoro-anandamide, a metabolically
stable analogue of the endocannabinoid anandamide, has
been demonstrated to inhibit spreading of endothelial cell
spheroids, reduce capillary-like tube formation in vitro and
suppress angiogenesis in an in vivo chick chorioallantoic
membrane assay (Pisanti et al., 2007). In addition, cannabi-
noids are also able to suppress pro-angiogenic factor produc-
tion (Casanova et al., 2003; Blázquez et al., 2004; Preet et al.,
2008) as well as directly induce apoptosis of the endothelial
Although cannabinoids have a favourable drug safety
profile, their clinical use in cancer therapy is impaired by
their psychoactivity and psychotropic side effects, mediated
largely by their interaction with the neuronal CB1cannabi-
noid receptor, or by their immune depressant effects, medi-
ated by the peripheral CB2cannabinoid receptor subtype.
More strategic approaches are aimed at the use of natural
non-psychotropic cannabinoids that bind with very low
affinity to cannabinoid receptors, thus excluding either psy-
chotropic and/or immune/peripheral effects (Gertsch et al.,
2010; Russo, 2011).
The non-psychoactive cannabinoid, cannabidiol (CBD),
which has a very low affinity for both CB1and CB2cannabi-
noid receptors, but variably interferes with transient receptor
potential (TRP) receptors (De Petrocellis et al., 2011) and
PPAR receptors (O’Sullivan and Kendall, 2010), has been
reported to inhibit the growth of several tumours (Ligresti
et al., 2006; Ramer et al., 2010a,b; McAllister et al., 2011;
Shrivastava et al., 2011), including glioma (Massi et al., 2004;
2006; 2008; Vaccani et al., 2005; Marcu et al., 2010; Torres
et al., 2011), both in vitro and in vivo. Treatment of glioma
cells with CBD triggered apoptosis/autophagy, caspase
cascade activation, oxidative stress as well as modulation of
the lipoxygenase pathway and the endocannabinoid system
(Massi et al., 2004; 2006; 2008; Vaccani et al., 2005; Marcu
et al., 2010; Torres et al., 2011).
The anti-angiogenic properties of CBD have not been
thoroughly investigated to date. Given its very favourable
pharmacological and toxicological profile, here, we investi-
gated the anti-angiogenic properties of CBD on human
umbilical vein endothelial cells (HUVECs). We found that
CBD induced endothelial cell cytostasis without inducing
apoptosis, inhibited endothelial cell migration, invasion
and sprouting in vitro and inhibited angiogenesis in vivo.
These effects were associated with a down-modulation of
several molecules associated with angiogenesis, including
MMP2 and MMP9, urokinase-type plasminogen activator
(uPA), endothelin-1 (ET-1), platelet-derived growth factor-AA
(PDGF-AA) and chemokine (c-x-c motif) ligand 16 (CXCL16).
Taken together, our results provide a wide spectrum char-
acterization of the anti-angiogenic effects of CBD on HUVECs
and its dual effect on both cancer and endothelial cells sup-
ports the hypothesis that CBD could represent a potential
effective agent in cancer therapy.
Standard chemicals and cell culture reagents were purchased
from Sigma-Aldrich Srl (Milan, Italy).
Murine recombinant VEGFA and murine recombin-
ant TNF-awere purchased from Peprotech (Offenbach,
Germany); heparin was obtained from Sigma (Sigma-Aldrich
Chemie, Taufkirchen, Germany).
CBD was a generous gift from GW Pharmaceuticals (Salis-
bury, UK). It was initially dissolved in ethanol to a concen-
tration of 50 mM and stored at -20°C and further diluted in
complete tissue culture medium; final ethanol concentration
never exceeded 0.05%.
Cell cultures
HUVECs were either isolated from umbilical cords by digestion
with collagenase as described by Jaffe et al. (1973) or pur-
chased from Promo Cell (Heidelberg, Germany) or Lonza
(Basel, Switzerland). These former cells were routinely grown
in 199 medium (M199), supplemented with 20% heat-
inactivated fetal bovine serum (FBS), 25 mg·mL-1endothelial
cell growth factor and 50 mg·mL-1heparin. The latter were
grown in endothelial growth medium as indicated by the
provider. All cells were maintained at 37°C in a humidified
5% CO2atmosphere and used between the second and eighth
passage in vitro.
For in vitro studies, cells were seeded in complete medium,
and after 24 h incubation, the medium was replaced by
Cannabidiol and angiogenesis
British Journal of Pharmacology (2012) 167 1218–1231 1219
medium with 2% FBS containing the compound to be tested
at the indicated concentrations.
MTT test
To determine the effects of CBD on cell proliferation, the
bromide] (MTT) colorimetric assay was carried out as previ-
ously reported (Massi et al., 2004). Briefly, HUVECs were
seeded in complete medium in a 96-well flat bottom multi-
well at a density of 1 ¥104cells per well. After 24 h, the
medium was replaced by medium with 2% FBS and 2 ng·mL-1
VEGF and cells were treated with CBD at the indicated con-
centrations for 24 h. At the end of the incubation with the
drug, MTT (0.5 mg·mL-1final concentration) was added to
each well and the incubation was continued for a further 4 h.
The insoluble formazan crystals were solubilized by the addi-
tion of 100 mL of 100% dimethyl sulfoxide. Plates were read at
570 nm, using an automatic microtitre plate reader and %
control was calculated as the absorbance of the treated cells
per control cells ¥100.
Cytofluorimetric analysis
HUVECs (6 ¥105) were incubated with different concentra-
tions of CBD for 24 h in 2% FBS complete medium. Cells were
then recovered, washed twice with PBS and transferred to test
tubes. Cells were pelleted and resuspended in Annexin
V-binding buffer (0.01 M HEPES (pH 7.4) and 0.14 M NaCl;
2.5 mM CaCl2). Fluorescein isothiocyanate Annexin V and
7-amino-actinomycin D (BD Biosciences, San Jose , CA, USA)
were added to each test tube and incubated for 15 min at
room temperature in the dark. Cells were then washed in PBS,
supernatants discarded and resuspended in 400 mL of binding
buffer. Samples were acquired by flow fluorocytometry using
a FACSCanto (BD Biosciences) and analysed using FACSDiva
Software 6.1.2. The experiment was performed twice and
each condition was in duplicate.
Cell migration assay – Boyden chamber and
scratch wound-healing assay
HUVEC migration assays were performed in a 48-well modi-
fied Boyden chamber as previously described (Cattaneo et al.,
2008). Briefly, Nucleopore polyvinylpyrrolidone-free polycar-
bonate filters (8 mm) coated with 10 mg·mL-1of type IV colla-
gen were placed over a bottom chamber containing M199
supplemented with 10% FBS as attractant factor. The cells,
suspended in M199 containing 1% fatty acid free BSA, were
incubated for 1 h with the indicated concentrations of CBD,
and then added to the upper chamber at a density of 5 ¥
104cells per well. CBD was continuously present during the
experiments. After 6 h of incubation at 37°C, non-migrated
cells on the upper surface of the filter were removed by
scraping. The cells migrated to the lower side of the filter were
stained with Diff-quick stain, and 5 unit fields per filter were
counted at 160 ¥magnification with a microscope (Zeiss,
Oberkochen, Germany). The assays were run in triplicate.
To investigate HUVEC migration, the cells were seeded at
a concentration of 4 ¥104cells·500 mL-1medium per well in
24-well culture plates. After 24 h, confluent monolayers were
‘scratched’ with a plastic pipette tip to create a uniform,
cell-free ‘wound’ area and treated with CBD at the indicated
concentrations. The gap created and the time required for
cells to migrate into the area were recorded by phase contrast
microscopy using a 10¥objective, at 0, 16 and 24 h. At each
time point, eight photographs of each wound area were taken
and the migratory effect was quantified by counting the cells
present in the gap using ImageJ software.
Human array kit/proteome profiler
To analyse the expression profiles of tumour-related proteins,
we used the Proteome Profiler™ Human Antibody Array Kit
(R&D Systems, Ltd, Abingdon, UK), according to the manu-
facturer’s instructions. This kit uses an array of 55 antibodies
directed at proteins involved in angiogenesis and invasive-
ness, spotted onto a nitrocellulose membrane. Briefly,
HUVECs were seeded in complete medium in a 24-well flat
bottom multiwell at a density of 9.6 ¥104cells per well-1. After
24 h, the medium was replaced by medium with 2% FBS and
2 ng·mL-1VEGF and cells were treated with CBD at the indi-
cated concentrations for 24 h. Supernatants of CBD-treated
and untreated HUVECs (1 mL) were centrifuged and mixed
with 15 mL of biotinylated detection antibodies for 1 h at
room temperature. Then the membranes were incubated with
the sample/antibody mixtures overnight at 4°C on a rocking
platform. Following a washing step to remove unbound mate-
rial, streptavidin–horseradish and chemiluminescent detec-
tion reagents were added sequentially. The intensity of
chemiluminescence was captured on X-ray film and the data
quantified by scanning on a transmission-mode scanner and
analysing the array image file using ImageJ analysis software.
The release of MMP2 from CBD-treated and -untreated
HUVECs was evaluated by an ELISA according to the manu-
facturer’s instructions (R&D Systems Ltd). Briefly, HUVECs
were seeded in complete medium in a 24-well flat bottom
multiwell at a density of 5 ¥104cells per well. After 24 h, the
medium was replaced by medium with 2% FBS and 2 ng·mL-1
VEGF and cells were treated with CBD at the indicated con-
centrations for 24 h. At the end of the incubation period,
supernatants were collected, centrifuged and protein content
was determined according to BCA assay (Pierce, IL, USA).
Samples (50 mL) were added to individual wells in a microwell
plate commercially coated with a polyclonal antibody against
human MMP2. After 2 h at room temperature, the wells were
washed and detection antibody against MMP2 conjugated to
horseradish peroxidase was added. The wells were then
washed and substrate solution, containing both hydrogen
peroxide and tetramethylbenzidine as chromogen, was added
for 30 min at room temperature. After the addition of the
stop solution, colour intensity was measured at 450 nm in a
microplate reader (EL800, Bio-Tek, Winooski, VT, USA). The
absorbance values of the unknown samples were within the
linearity range of the ELISA test, assessed by calibration
curves obtained with known amounts of MMP2.
Western blotting
HUVECs were plated in complete medium and after adhesion
were treated with increasing concentrations of CBD in the
presence of 2% FBS. After 24 h, cells were collected by brief
trypsinization and total lysates were prepared using Cell Lysis
BJP M Solinas et al.
1220 British Journal of Pharmacology (2012) 167 1218–1231
Buffer (Cell Signaling Technology, Beverly, MA, USA). Protein
concentrations were evaluated by the DC Protein Assay (Bio-
Rad, Hercules, CA, USA). Equal amounts of proteins for each
sample were resolved on 10% SDS-PAGE and blotted onto
nitrocellulose membranes (Amersham, Biosciences, Otelfin-
gen, CH). Following blocking with 5% non-fat milk powder
(w v-1) in Tris-buffered saline (10 mM Tris–HCl, pH 7.5,
100 mM NaCl, 0.1% Tween-20) for 1 h at room temperature,
membranes were incubated with primary antibodies directed
against the human antigens MMP2 and uPA (5B4 clone), both
kindly provided by Prof Mario Del Rosso (Department of
Experimental Pathology and Oncology, University of Flor-
ence) and an anti-a-tubulin antibody used for normalizing
protein loading. The antibodies were diluted in 5% BSA,
Tris-buffered saline, 0.1% Tween-20 and 5% milk powder,
Tris-buffered saline, 0.1% Tween-20, respectively. The bound
antibodies were visualized by horseradish-peroxidase-
conjugated secondary antibodies and an enhanced chemi-
luminescence detection system from Amersham Biosciences
(Pittsburgh, PA, USA).
Zymographic analysis
Zymography was performed by electrophoresis of 10 mgof
proteins extracted from HUVECs treated with different con-
centrations of CBD as for Western blotting, but without
heating the samples, in 10% polyacrylamide containing 0.1%
gelatin in the presence of SDS. After electrophoresis, the gels
were incubated for 30 min at room temperature with gentle
agitation in Renaturing Buffer (Invitrogen, Eugene, OR, USA)
and overnight at 37°C in the Developing Buffer (Invitrogen).
The gels then were stained for 30 min with Coomassie®
G-250 stain (Invitrogen), which visualizes areas where the
gelatin has been removed by enzymatic activity. The resulting
bands were acquired with an Epson Perfection V750 pro
scanner (Syngene, Cambridge, UK).
Matrigel morphogenesis assay
The effects of CBD on the ability of HUVECs to reorganize and
differentiate into capillary-like networks were also assessed in
the in vitro Matrigel morphogenesis assay. A 24-multiwell
plate, pre-chilled at -20°C, was carefully filled with 300 mL per
well of liquid Matrigel (10 mg·mL-1) at 4°C with a pre-chilled
pipette, avoiding bubbles. The Matrigel was then polymerized
for 1 h at 37°C. HUVECs (5 ¥104cells per well) were suspended
in 1 mL of complete medium supplemented with 2% FBS in
the absence or presence of different concentrations of CBD at
the indicated concentrations, and carefully layered on the top
of the polymerized Matrigel. Effects on the growth and mor-
phogenesis of HUVECs were recorded after 6 h incubation
with an inverted microscope (Leica DM-IRB, Leitz Microsys-
tems, Wetzlar, Germany) equipped with charge-coupled
device optics and a digital analysis system.
In vitro angiogenesis assay from spheroids
HUVEC spheroids were generated as described by Korff and
Augustin (1998). In brief, a specific number of HUVECs (1 ¥
103cells per well) were suspended in M199-containing 10%
FBS and 0.25% (w v-1) carboxymethylcellulose, and seeded in
non-adherent round bottom 96-well plates. Under these con-
ditions, single suspended cells contribute to the formation of
an endothelial cell-derived spheroid.
In order to quantify in vitro angiogenesis, HUVEC sphe-
roids were embedded into collagen gels. Briefly, 50–100
HUVEC spheroids were suspended in 0.3 mL of 20% FBS
containing 0.9% (w v-1) carboxymethylcellulose, and mixed
with 0.3 mL of a collagen stock solution prepared by mixing
at 4°C acidic rat tail collagen (5 mg·mL-1; 8 vol) with 10¥
M199 and 0.1 M NaOH to adjust the pH to 7.4. The various
test substances were added to the suspended spheroids before
embedding them into collagen. The spheroid-containing gel
was rapidly transferred into pre-warmed 24-well plates, and
incubated for 48 h at 37°C in 5% CO2. In-gel angiogenesis
was quantified by measuring the cumulative length of all of
the capillary-like sprouts originating from the individual
spheroids using the National Institute of Health Image J pro-
gramme. At least 20 spheroids per experimental group were
measured in each experiment.
Male mice (6–7 weeks old, ~20 g body weight) were main-
tained on a standard chow pellet diet and had free access to
water, with a 12 h light/dark cycles. Wild-type (WT) animals
(strain C57/BL6; Charles River, Italy) were used 7 days after
arrival. Groups of eight mice were used for each treatment for
a total number of 40 animals. The animals were monitored
daily for health status. All procedures were performed in
adherence with the guidelines released by the Italian Ministry
of Health (D.L.116/92) and the European Community direc-
tives regulating animal research (86/609/EEC). The results of
all studies involving animals are reported in accordance with
the ARRIVE guidelines (Kilkenny et al., 2010; McGrath et al.,
In vivo angiogenesis: Matrigel sponge assay
The ability of CBD to inhibit the formation of new blood
vessels in vivo was tested using the Matrigel sponge model as
described previously (Albini et al., 1994). Liquid Matrigel
solutions containing an angiogenic cocktail (100 ng·mL-1
VEGFA, 1.2 ng·mL-1TNF-a, and 25 U·mL-1heparin) in com-
bination with different concentrations of CBD or vehicle
alone were brought to a final volume of 0.6 mL and slowly
injected s.c. into the flanks of C57/BL6 male mice (Charles
River) where they formed a polymerized support. Heparin
was added to avoid cytokine/growth factor trapping by pro-
teoglycans in the Matrigel. The CBD concentrations were
calculated by referring to the dose that we previously injected
peritumourally in xenografts of nude mice (Massi et al.,
2004). Groups of eight mice were used for each treatment.
Four days after injection, the gels were recovered and
weighed. For haemoglobin measurements, the recovered gels
were minced and dispersed in PBS. The haemoglobin released
was measured using Drabkin reagent kit (Sigma) and the
concentration calculated from a calibration curve after spec-
trophotometric analysis at 540 nm.
Statistical analysis
Results are presented as mean SEM. The significance of
differences was evaluated by one-way ANOVA, followed by
post-hoc analysis Dunnett’s t-test, performed with the Prism
software package (GraphPad Software for Science, Inc., San
Diego, CA, USA).
Cannabidiol and angiogenesis
British Journal of Pharmacology (2012) 167 1218–1231 1221
The drug/molecular target nomenclature conforms to the
BJP’s Guide to Receptors and Channels (Alexander et al.,
CBD inhibits HUVEC proliferation
We first investigated whether CBD could effect the prolifera-
tion of HUVECs. The addition of CBD to the cells for 24 h
resulted in a concentration-dependent inhibition of the
mitochondrial oxidative metabolism, as determined by the
MTT test (Figure 1). The range of concentrations tested was
from 1 mMto19mM. Statistically significant differences from
the control were observed at concentrations of 9 mMor
greater. The reduction in MTT at 9 mM was 36 2%, with an
IC50 of MTT inhibition of 9.90 1.02 mM. These findings
indicate that CBD inhibited HUVEC proliferation, as the
metabolic activity measured by MTT reflects cell number.
CBD does not induce toxicity or apoptosis in
To verify whether CBD was cytotoxic or induced apoptosis of
endothelial cells, we performed cytofluorimetric viability
analyses. HUVECs were exposed to different mM concentra-
tions of CBD for 24 h, and, after incubation, cells were ana-
lysed for both Annexin V and 7-amino-actinomycin D. A
high percentage of viable cells (about 90%) was observed in
all the samples, with no significant difference between the
treated and untreated cells (Figure 2). These data show that
CBD had no toxic effect on HUVECs, suggesting that the
inhibitory effects exerted by CBD on HUVECs were not due to
apoptosis or toxicity but rather cytostasis.
CBD potently inhibits HUVEC migration
To investigate if CBD is able to modulate HUVEC migration,
we employed a 48-well modified Boyden chamber assay. As
shown in Figure 3A, CBD treatment caused a decrease in cell
migration from 30% to 75% in the range 1–10 mM, and sta-
tistical significance was reached at 1 mM, a concentrations
much lower than those inducing cytostasis (MTT test, IC50
9.90 1.02 mM ; Figure 1).
To confirm this anti-migratory effect, we performed a cell
culture wound-healing assay. Images of the cell-free wound
area were taken after 16 h and 24 h. Figure 3B shows the
qualitative effect of increasing CBD concentration on
HUVECs at 16 h in the wound healing assay. In the control
group, cells have migrated in the gap, whereas in CBD-treated
cells there is a clear reduction in migration. Quantification of
data showed a dose-dependent effect of CBD at inhibiting cell
migration (Figure 3C) evident after 16 h of treatment and
persisting for up to 24 h. Calculation of the IC50 indicated a
value of 9.31 1.02 mM, similar to that of the IC50 for
CBD modifies the expression pattern of
angiogenesis-related proteins in HUVECs
Since angiogenesis depends on the activity of different pro-
teins involved in complex pathways, we decided to analyse
whether CBD interfered with the expression profile of a set of
proteins involved in the angiogenic process, using a rapid
and sensitive antibody array-based assay. The array images
shown in Figure 4A allow a qualitative assessment of the
effect of CBD on the expression pattern of multiple proteins
released by HUVECs and captured by the specific pre-spotted
antibodies on nitrocellulose membranes (see Methods). Eight
proteins on the panel were down-regulated in response
to CBD: MMP9, tissue inhibitor of metalloproteinases 1
(TIMP1), SerpinE1-plasminogen activator inhibitor type-1
(PAI-1), uPA, CXCL16, ET-1, PDGF-AA and IL-8. The extent of
down-regulation ranged from 20% up to 50% as compared to
the control, depending on the protein, in the presence of the
highest concentration of CBD used, 12 mM (Figure 4B). The
effect of CBD on the protease uPA was confirmed by Western
blotting (Figure 4C), where a clear concentration-dependent
reduction of expression was observed.
Given the crucial role played by MMP2 in enhancing
angiogenesis, and since the levels of this protein cannot be
detected by the antibody array method, we performed an
ELISA assay to determine whether CBD inhibits HUVEC inva-
sion by modulating MMP2 release into the supernatants of
HUVECs. As shown in Figure 5A, after a slight increase at the
lowest dose tested, CBD induces a concentration-dependent
decrease in MMP2 release. Western blot analyses were also
performed to evaluate the effect of CBD on the expression of
MMP2 and uPA proteins extracted from HUVECs. Treatment
with CBD resulted in a dose-dependent inhibition of MMP2
(Figure 5B). Zymography analysis revealed a concentration-
dependent reduction in the corresponding gelatinolytic
activity produced by CBD-treated HUVECs (Figure 5C).
CBD inhibits endothelial morphogenesis in
vitro and the outgrowth of capillary-like
structures from HUVEC spheroids
HUVECs when plated on a three-dimensional (3-D) Matrigel
layer are able in 6 h to organize into capillary-like networks,
mimicking in vitro the events that occur in vivo during the
Figure 1
Cannabidiol inhibits the proliferation of HUVECs. HUVECs were cul-
tured in serum-free medium with increasing concentrations of CBD.
Cell proliferation was determined by MTT assay after 24 h of treat-
ment. The proliferation was expressed as percentage of the untreated
control. Data represent the mean SEM of at least three independ-
ent experiments.
BJP M Solinas et al.
1222 British Journal of Pharmacology (2012) 167 1218–1231
Figure 2
Cannabidiol does not induce toxicity or apoptosis in endothelial cells. HUVECs were incubated in 2% FBS complete medium with increasing
concentrations of CBD for 24 h. The cells were then harvested, stained with both Annexin V and 7-amino-actinomycin D, analysed and quantified
by flow cytometry. (A) Representative charts indicating the proportion of apoptotic and necrotic cells. (B) Histogram representing means and SD
of three different experiments.
Cannabidiol and angiogenesis
British Journal of Pharmacology (2012) 167 1218–1231 1223
angiogenic process (Grant et al., 1989). Thus, we employed
this model to characterize the in vitro anti-angiogenic effect of
CBD. The addition of the drug partially interfered with mor-
phogenesis of HUVECs (Figure 6A).
To confirm the results obtained, we set up a collagen
gel-based 3-D angiogenesis assay where the outgrowth of
capillary-like structures from HUVECs can be quantitatively
measured (Korff and Augustin, 1999; Cattaneo et al., 2009).
Standardized spheroids were seeded in collagen gels and
treated for 48 h with VEGF (30 ng·mL-1) in the absence or
presence of CBD (1 mM). We found that CBD significantly
inhibited the VEGF-induced outgrowth of capillary-like struc-
tures from HUVEC spheroids (Figure 6B, C), confirming its
ability to act, at least in vitro, as an anti-angiogenic factor and
suggesting an effect largely on sprouting of new capillaries.
CBD inhibits in vivo angiogenesis
The sponge model was used as a rapid and quantitative
system for measuring the in vivo anti-angiogenic activity of
CBD dissolved in Matrigel. A s.c. injection of Matrigel pro-
duces a 3-D pellet which, when angiogenic factors are
present, becomes rapidly vascularized. A cocktail of VEGF,
TNF-aand heparin, mixed with the Matrigel, induced a
strong angiogenic reaction (Figure 7A). When increasing con-
centrations of CBD were added to this mixture, significant
inhibition of the in vivo angiogenic response was observed, as
detected by measuring the haemoglobin content of the recov-
ered gels (Figure 7B). At the lowest dose employed, the effect
of CBD, although still significant, was lower, suggesting a
dose-dependent effect.
Discussion and conclusions
Angiogenesis is a highly regulated multistep process that
involves endothelial cell chemotactic migration, invasion,
proliferation, differentiation into tubular capillaries, and the
production of a basement membrane around the vessels
(Folkman, 1995; Kesisis et al., 2007). In this study, CBD exhib-
ited potent anti-angiogenic properties, inhibiting HUVEC
growth, migration and invasion in vitro as well as angiogen-
esis in the Matrigel sponge assay in vivo. Molecular studies in
vitro demonstrated that CBD exerts its effects through the
down-regulation of several angiogenic mechanisms. Taken
together, these data suggest that CBD has great potential as a
new anti-angiogenic drug.
Our results demonstrated that CBD was effective in
inhibiting endothelial cell proliferation without inducing
Figure 3
Cannabidiol inhibits HUVEC migration in a concentration-dependent manner. (A) HUVECs were pretreated for 1 h with CBD, and chemotaxis
experiments were then performed as described, using 10% FBS as a chemoattractant. The results are expressed as a percentage of the maximal
migration induced by FBS in the absence of CBD. Mean values SEM of two independent experiments performed in triplicate are shown.
**P<0.01, ***P<0.001 compared to untreated cells, Dunnett’s t-test. (B) HUVECs were seeded in 24-well culture plates and grown for 24 h. Then,
confluent monolayers were scratched with a plastic pipette tip and treated with CBD at the indicated concentrations. Images of the cell-free
wound area were taken by phase contrast microscopy using a 10¥objective, at 0 h, 16 h and 24 h. Representative images of the qualitative effect
of increasing CBD concentration on HUVECs 16 h after scratch. (C) Quantification of the cells migrated into the gap, 16 h (left) and 24 h (right)
after treatment. **P<0.01 versus Control (C), Dunnett’s t-test.
BJP M Solinas et al.
1224 British Journal of Pharmacology (2012) 167 1218–1231
endothelial cell apoptosis or necrosis, suggesting a cytostatic
action. Several chemotherapeutic drugs have anti-angiogenic
properties only at near or fully cytotoxic concentrations;
therefore, their clinical relevance is controversial. Interest-
ingly, CBD did not induce HUVEC apoptosis or necrosis even
at the highest dose tested (12 mM). Several anti-angiogenic
molecules inhibit endothelial cell proliferation, without
exerting any cytotoxic action and can even inhibit apoptosis
in endothelial cells (Fassina et al., 2004; Lorusso et al., 2009;
Noonan et al., 2011b). This seems to be in contrast to their
effects on tumour cells, where often these compounds are
cytotoxic, at least at high doses. However, this may depend
on several characteristics of tumour cells, including chronic
stress related to high-level production of oxygen and other
radicals, metabolic alterations and oncogene dependence
(Ferrari et al., 2010). Further cellular stress in tumour cells
pushes the cell over the threshold and into apoptosis,
whereas in normal cells, this may act as a form of ‘precondi-
tioning’ stimulus that renders the cells more resistant to
subsequent insults (Ferrari et al., 2010).
CBD’s lack of cytotoxicity towards endothelial cells is
quite different from that reported in previous studies with
other cannabinoids (Blázquez et al., 2003). In these studies,
endothelial cell cytotoxicity was considered a potential
mechanism of action. Our data suggest that, unlike other
cannabinoids, the effects of CBD are not due to endothelial
cell toxicity but rather to modulation of intracellular path-
ways leading to a decrease in several pro-angiogenic factors.
CBD showed potent inhibition of endothelial cell migra-
tion, both in the scratch wound-healing assay and, with an
even stronger effect, in the Boyden chamber assay. The dif-
ferent efficacy of CBD in these tests could be ascribed to the
different sensitivity of the assays, since the wound-healing
assay is generally less sensitive than the Boyden chamber.
Moreover, the use of primary fresh HUVECs in the Boyden
chamber in comparison with the commercially available cells
employed in the wound-healing assay could account for the
different potency observed. However, in our hands, CBD elic-
ited significant effects on migration at concentrations lower
than those causing 50% inhibition of proliferation (9 mM and
Figure 4
Cannabidiol affects the protein expression profile of HUVECs. (A) HUVECs were treated with CBD for 24 h and supernatants were used to
determine different protein levels through a human antibody array kit/proteome profiler. Representative proteomic membrane analysis with the
indication of proteins modified. (B) Densitometric analysis of the membrane spots reported as percentage of the untreated control. Data represent
the mean SEM of three independent experiments. *P<0.05, **P<0.01, ***P<0.001 versus Control, Dunnett’s t-test. (C) Western blot analysis
of 5B4 antibody against uPA. A representative Western blot is shown. NT, not treated.
Cannabidiol and angiogenesis
British Journal of Pharmacology (2012) 167 1218–1231 1225
1mM, respectively, in wound healing and Boyden chamber
assays versus IC50 value of 10 mM in the MTT assay run in
parallel to the migration tests). We previously demonstrated
the same order of potency of CBD on U87-MG glioma cell
proliferation versus invasion (Vaccani et al., 2005). In agree-
ment with these results, Marcu et al. (2010) showed that CBD
was more potent at inhibiting U251 invasiveness compared
to their proliferation. Thus, similar to glioma, CBD is highly
potent at inhibiting endothelial cell migration compared to
proliferation, suggesting that factors influencing cell migra-
tion and invasion may represent its primary targets.
In line with this, our molecular investigation showed that
CBD affected the expression of several prominent factors
involved in primary vascular endothelial cell functions; in
particular compounds that induce invasion and migration,
which included MMP2 and MMP9, TIMP1, SerpinE1/PAI1,
uPA, CXCL16, IL-8, ET-1 and PDGF-AA.
CBD inhibited MMP2 and MMP9, two fundamental pro-
teases that, through the remodelling of the extracellular
matrix and basement membrane, are involved in distinct
vascular events, and whose levels are increased in numerous
malignancies, including glioma (Cantelmo et al., 2010;
Pisanti et al., 2011; Noonan et al., 2011b).
CBD down-regulated the expression of TIMP1, a stromal
factor with multiple functions. TIMPs are commonly
described as negative regulators of MMPs. Nasser et al. (2006)
showed that TIMP1 is an inhibitor of high-grade glioma inva-
sion. In line with this, Ramer et al. (2010a) recently reported
a CBD-driven increase in TIMP1 in lung cancer cells that
correlated with diminished invasiveness. Nevertheless, there
is increasing evidence to suggest that TIMPs are multifunc-
tional proteins, possessing a dual role in regulating cell pro-
liferation and angiogenesis. In vitro, TIMP1 promotes growth
of human keratinocytes and several other cell types (Bertaux
et al., 1991; Hayakawa et al., 1992), inhibits apoptosis
(Alexander et al., 1996; Guedez et al., 1998; Li et al., 1999)
and regulates angiogenesis (Yoshiji et al., 1998; Lafleur et al.,
2002). Moreover, increased expression of TIMP1 protein has
been observed in multiple tumour types, including breast,
colon, gastric and lung cancers, as well as in lymphoma and
carcinomas of unknown primary origin (Zeng et al., 1995;
Mimori et al., 1997; Ree et al., 1997; Guedez et al., 2001;
Schrohl et al., 2004; Gouyer et al., 2005; Karavasilis et al.,
Based on these considerations, it is noteworthy that inhi-
bition of proteins such as MMP2 and MMP9 and TIMP1
further confirms the wide spectrum of CBD action on MMP
and TIMP molecules, key factors in cell motility, invasion and
proliferation, and suggests a complex picture through which
CBD can impair cell growth and invasion.
In addition to the MMP/TIMP system, CBD also down-
regulated the uPA and the plasminogen activator inhibitor
SerpinE1/PAI-1, two important factors in extracellular matrix
remodelling and consequent angiogenesis. The uPA plays
a pivotal role in the degradation of extracellular matrix,
and suppression of uPA and uPAR by shRNA attenuates
angiogenin-mediated angiogenesis in endothelial and gliob-
lastoma cell lines (Raghu et al., 2010). Thus, CBD shares simi-
larities with other therapeutic approaches that, by inhibiting
the uPA/uPAR functions, have been shown to possess anti-
angiogenic and anti-tumour effects (for review, see Ulisse
et al., 2009).
Figure 5
Cannabidiol affects the expression of MMP2. (A) HUVECs were treated with CBD for 24 h and the MMP2 levels in supernatants were determined
by ELISA. Protein levels in the different experimental conditions, compared with Control, of three independent experiments are shown. **P<0.01
versus Control (C), Dunnett’s t-test. (B) Western blot analysis of MMP2. A representative Western blot is shown. NT, not treated. A human MMP2
protein (MMP2) was used as a standard. (C) Representative zymogram corresponding to the expression and gelatinolytic activity of MMP2 by
HUVECs treated with different concentrations of CBD. A human MMP2 protein (MMP2) was used as a standard.
BJP M Solinas et al.
1226 British Journal of Pharmacology (2012) 167 1218–1231
Since SerpinE1/PAI-1 inhibits uPA, low levels of this
protein would be expected to favour cell growth. However,
recent data have revealed a two-faced role in the modulation
of apoptosis in tumour cells in comparison with non-tumour
cells. At present, the reason for these discrepant effects is still
unclear and some recent reports point to other multifunc-
tional roles of this protein in angiogenesis, invasiveness and
cell adhesion (Ulisse et al., 2009).
CBD also significantly inhibited two potent angiogenic
factors: the chemokines CXCL16 and IL-8 (Rabquer et al.,
2011). Stimulation of HUVECs with CXCL16 leads to
increases in cell proliferation, chemotactic motility and
network formation (Zhuge et al., 2005), whereas IL-8 can
induce angiogenesis through both direct and indirect mecha-
nisms (Benelli et al., 2002; 2003; Lai et al., 2011). The
decreased level of both chemokines following CBD treatment
would be consistent with its in vitro and in vivo anti-
angiogenic effects.
Two growth factors were also down-regulated by CBD:
ET-1 and PDGF-AA. ETs modulate various stages of neovascu-
larization. Increased levels of ET-1 and its cognate receptor are
significantly associated with microvessel density and VEGF
expression in tumour cells, whereas its down-regulation cor-
relates well with diminished endothelial cell growth and
migration (Bagnato et al., 2008).
PDGF-AA is a member of the well-known PDGF family
that exerts its angiogenic effect in endothelial cells by
binding to a specific protein tyrosine kinase receptor, which
in its turn engages several signalling molecules involved in
multiple cellular and developmental responses.
Taken together, these observations suggest a broad effect
of CBD on vascular endothelial cell biology. This wide
Figure 6
Cannabidiol inhibits in vitro endothelial morphogenesis and angiogenesis. (A) HUVECs were incubated on a Matrigel substrate in the presence of
M199 alone (Control –) or of M199 supplemented with 2% FBS (Control +), in the absence or presence of different concentrations of CBD for
6 h at 37°C. CBD interfered with HUVEC organization in capillary-like networks. (B) HUVEC spheroids, generated as described in the ‘Methods’
section, were embedded in collagen gel supplemented with VEGF (30 ng·mL-1) in the absence (Control) or in the presence of CBD (1 mM).
Representative photos of each experimental group are shown. (C) Quantification of the sprouting. The results are expressed as the mean SEM
of the cumulative sprout length of the capillary-like structures emerging from 24 to 26 individual spheroids per experimental group. **P<0.01
compared to spheroids from control HUVECs, Dunnett’s t-test.
Cannabidiol and angiogenesis
British Journal of Pharmacology (2012) 167 1218–1231 1227
spectrum modulation of angiogenesis-related factors leads to
a decreased ability of endothelial cells to properly form new
vessels in vitro and, to an even more prominent extent,
impaired angiogenesis in in vivo plugs.
However, the molecular mechanism through which CBD
exerts these effects still remains unknown. Vascular endothe-
lial cells express various functional receptors for cannabi-
noids, including the CB1receptor (Liu et al., 2000), the CB2
receptor (Blázquez et al., 2003), the tentative abnormal CBD
receptor (Járai et al., 1999), the TRP receptors (Golech et al.,
2004; Curry and Glass, 2006; Kwan et al., 2007) and the
PPARg(O’Sullivan et al., 2009; Yokoyama et al., 2011): each of
these could, at least in part, be involved in CBD anti-
angiogenic effects. These receptors control important cell
functions such as migration (Blázquez et al., 2003; Mo et al.,
2004), survival (Blázquez et al., 2003), vascular tone (Wagner
et al., 1997; Bátkai et al., 2001) and tumour-derived endothe-
lial cell migration (Fiorio Pla et al., 2012). Recently, blockade
of the CB1receptor has been closely linked to inhibition
of angiogenesis (Pisanti et al., 2011). Our present data do
not allow us to indicate a receptor-dependent versus
-independent mechanism of CBD in HUVECs. Since both
cannabinoid-dependent (McKallip et al., 2002; 2006; Ligresti
et al., 2006; Ramer et al., 2010a,b; Aviello et al., 2012) and
-independent (Massi et al., 2004; Vaccani et al., 2005; Shrivas-
tava et al., 2011) mechanisms were previously shown for CBD
anti-tumour effects, it is also possible that its anti-angiogenic
activity may be due to a receptor-independent mechanism,
involving different primary cellular targets. In line with this,
recent studies (McAllister et al., 2007; 2011) have demon-
strated that the anti-invasive and anti-proliferative effects of
CBD in breast cancer are closely associated with inhibition of
Id-1, an inhibitor of basic helix-loop-helix transcription
factors that is over-expressed in tumour cells. Id proteins play
a vital role in regulating angiogenesis during embryonic
development and tumourigenesis and ectopic Id-1 expression
in HUVECs leads to increased migration of the cells, while
suppression of its endogenous expression results in reduced
migration (Qiu et al., 2011). Thus, Id-1 could represent a key
signalling pathway for CBD in HUVECs.
In conclusion, our results indicate that CBD exerts a
potent anti-angiogenic effect by widely affecting several path-
ways involved in this process. Its dual effect on both tumour
and endothelial cells further suggests that CBD could repre-
sent a potential effective agent in cancer therapy.
The authors wish to thank GW Pharmaceuticals for providing
CBD and financial support to conduct these studies. These
studies were also funded by the AIRC (Associazione Italiana
per la Ricerca sul Cancro) to AA and DMN. We thank Prof.
Mario Del Rosso (Department of Experimental Pathology and
Oncology, University of Florence) for kindly providing the
human anti-MMP2 and anti-uPA (5B4 clone) antibodies.
Conflicts of Interest
This research work was partially funded by GW
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Cannabidiol inhibits in vivo angiogenesis. Matrigel sponges containing angiogenic factors (VEGF, TNF-aand heparin) become rapidly vascularized
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... In addition to the role they play regarding pain, neuropeptides released by stimulated nerve endings are involved in vasodilation, inflammation (by producing proinflammatory cytokines and by activating inflammatory infiltrating cells), and synoviocyte proliferation and activation (115,116). During joint diseases, the proliferation of endothelial cells and their morphological differentiation to form tubes accompanies extracellular matrix degradation which facilitates the tissutal invasion of inflammatory cells and is perpetuated by various mediators (2,(116)(117)(118). Therefore, angiogenesis and matrix degradation may be interesting/key targets to counteract the progression and chronicity of joint inflammation and degeneration. ...
... The notable anti-angiogenic activities of cannabinoid compounds, which have mainly been tested in tumor experiments, are carried out directly, inhibiting vascular endothelial cell migration and survival, and decreasing the expression of proangiogenic factors (35,128). It has been shown that CBD may inhibit angiogenesis by the down-modulation of several angiogenesis-related molecules (117). Cannabinoids may act on different receptors to obtain their effect; however, the expression of . ...
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Background: The metacarpophalangeal joint undergoes enormous loading during locomotion and can therefore often become inflamed, potentially resulting in osteoarthritis (OA). There are studies indicating that the endocannabinoid system (ECS) modulates synovium homeostasis, and could be a promising target for OA therapy. Some cannabinoid receptors, which modulate proliferative and secretory responses in joint inflammation, have been functionally identified in human and animal synovial cells. Objective: To characterize the cellular distribution of the cannabinoid receptors 1 (CB1R) and 2 (CB2R), and the cannabinoid-related receptors transient receptor potential vanilloid type 1 (TRPV1), G protein-related receptor 55 (GPR55) and peroxisome proliferator-activated receptor alpha (PPARα) in the synovial membrane of the metacarpophalangeal joint of the horse. Animals: The dorsal synovial membranes of 14 equine metacarpophalangeal joints were collected post-mortem from an abattoir. Materials and methods: The dorsal synovial membranes of 14 equine metacarpophalangeal joints were collected post-mortem from an abattoir. The expression of the CB1R, CB2R, TRPV1, GPR55, and PPARα in synovial tissues was studied using qualitative and quantitative immunofluorescence, and quantitative real-time reverse transcriptase PCR (qRT-PCR). Macrophage-like (MLS) and fibroblast-like (FLS) synoviocytes were identified by means of antibodies directed against IBA1 and vimentin, respectively. Results: Both the mRNA and protein expression of the CB2R, TRPV1, GPR55, and PPARα were found in the synoviocytes and blood vessels of the metacarpophalangeal joints. The synoviocytes expressed the mRNA and protein of the CB1R in some of the horses investigated, but not in all. Conclusions and clinical importance: Given the expression of the CB1R, CB2R, TRPV1, GPR55, and PPARα in the synovial elements of the metacarpophalangeal joint, these findings encouraged the development of new studies supporting the use of molecules acting on these receptors to reduce the inflammation during joint inflammation in the horse.
... Many studies have shown that cannabinoids may have anticancer properties and antiangiogenic, anti-inflammatory, and antiseizure effects using in vitro and in vivo models. [21][22][23][24][25][26][27] Cannabinoid mechanisms of action are not yet fully understood. Binding of THC, CBD, or other plant constituents to receptors are considered to elicit a great number of pathways, including the mitogen-activated protein kinase-driven apoptosis and autophagy pathways, endoplasmic reticulum stressrelated pathways, and inflammasome-mediated signaling pathways. ...
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The endocannabinoid system (ECS) is an integral neuromodulatory system involved in neuronal development, synaptic plasticity, and homeostasis regarding immunity, as well as brain and other physiological functions such as anxiety, pain, metabolic regulation, and bone growth. Cannabis is a plant that contains exogenous cannabinoids, which have the potential for profound interplay within the ECS as enzymatic inhibitors or receptor-mediated interactions. Activation of cannabinoid receptors leads to various intracellular signaling processes that are involved in cellular functions, but those interactions are diverse due to different affinities of each cannabinoid with relevant receptors. Among the exogenous cannabinoids, cannabidiol (CBD) has drawn attention due to its potential anticancer, antiangiogenic, anti-inflammatory, and antiseizure properties using in vitro and in vivo models. Although scientific evidence is limited in dogs, there appears to be cautious optimism regarding the utilization of CBD in conjunction with other therapeutics for a range of disorders. This review will primarily focus on current scientific research on the efficacy of CBD on seizure, anxiety, osteoarthritis, and atopic dermatitis, following a brief discussion of endo- and exogenous cannabinoids, ECS, their molecular mechanism, and potential side effects in veterinary medicine. Cannabinoid pharmacology and pharmacokinetics will be addressed in the companion Currents in One Health by Schwark and Wakshlag, AJVR , May 2023.
... CBD (2.5 µM) robustly promoted the osteogenic differentiation of DPSC. These results are in agreement with other studies that a low dose of CBD (<10 µM) enhances proliferation and osteogenic differentiation of MSCs (41)(42)(43), while the pro-mitotic effects weakened with a higher dose of CBD (>10 µM) (44)(45)(46). Based on our ndings, we choose CBD (2.5 µM) as an optimal concentration to induce osteogenic potential in DPSC. ...
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Dental pulp stem cells (DPSC)-derived 3D-aggregates/spheroids have shown robust soft/hard tissue regeneration potential. However, difficulties to control the cell number, size, and shape of DPSC-aggregates/spheroids cause cell necrosis and difficulties in homogenous seeding of aggregates/spheroids in the 3D-printed microporous bone grafts. Moreover, inducing the osteogenic potential of these aggregates/spheroids is still a challenge. This study developed cannabidiol (CBD)-pretreated, self-assembled, and injectable DPSC-derived osteogenic micro-spheroids (70 μm) that robustly promoted in situ bone regeneration. We developed micro-spheroids by seeding 250 cells/microwell in agarose gel microwells of 200 µm diameter developed using prefabricated mold and cultured with CBD for 14 days to induce osteogenic potential. In vitro study results showed that CBD did not affect the viability of DPSC but promoted osteogenic differentiation during 2D culture. In micro-spheroids, 3D cytoskeleton visualization showed better integrity and robustly higher expression of osteogenic markers and promoted in situ bone regeneration compared with DPSC. CBD-pretreated micro-spheroids showed robustly higher bone-regenerative capacity via upregulation of WNT6. Taken together, our approach of developing organoid-like injectable osteogenic micro-spheroids can be used as the effective carrier of the effect of in vitro drug treatment during in situ bone tissue engineering which eliminates the direct in vivo drug application-related adverse effects.
... CBD and CBG inhibit tumor growth in human PCa cells and xenograft models [11,24] although through different and not completely elucidated mechanisms. Currently, a phase I/Ib study is evaluating the safety and effectiveness of Epidiolex (CBD) in biochemically recurrent PCa patients (Clinical Trials Identifier: NCT04428203) [25]. ...
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In spite of the huge advancements in both diagnosis and interventions, hormone refractory prostate cancer (HRPC) remains a major hurdle in prostate cancer (PCa). Metabolic reprogramming plays a key role in PCa oncogenesis and resistance. However, the dynamics between metabolism and oncogenesis are not fully understood. Here, we demonstrate that two multi-target natural products, cannabidiol (CBD) and cannabigerol (CBG), suppress HRPC development in the TRansgenic Adenocarcinoma of the Mouse Prostate (TRAMP) model by reprogramming metabolic and oncogenic signalling. Mechanistically, CBD increases glycolytic capacity and inhibits oxidative phosphorylation in enzalutamide-resistant HRPC cells. This action of CBD originates from its effect on metabolic plasticity via modulation of VDAC1 and hexokinase II (HKII) coupling on the outer mitochondrial membrane, which leads to strong shifts of mitochondrial functions and oncogenic signalling pathways. The effect of CBG on enzalutamide-resistant HRPC cells was less pronounced than CBD and only partially attributable to its action on mitochondria. However, when optimally combined, these two cannabinoids exhibited strong anti-tumor effects in TRAMP mice, even when these had become refractory to enzalutamide, thus pointing to their therapeutical potential against PCa.
... Defects in VEGF ligands or receptors, including VEGF-R1, which are highly expressed throughout the brain (Lecuyer et al., 2017), can lead to impairment of blood vessel function (Cebe-Suarez et al., 2006). Notably, both ethanol and cannabinoid exposure during development has been shown to decrease VEGF expression and inhibit angiogenesis (Wang et al., 2016;Solinas et al., 2012;Martínez-Peña et al., 2021;Blázquez et al., 2004). Both exposures produce a decrease in cell proliferation, although presently, only ethanol exposure is also associated with increased rates of neuronal apoptosis during a crucial developmental window for angiogenesis. ...
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Alcohol and marijuana are two of the most consumed psychoactive substances by pregnant people, and independently, both substances have been associated with lifelong impacts on fetal neurodevelopment. Importantly, individuals of child-bearing age are increasingly engaging in simultaneous alcohol and cannabinoid (SAC) use, which amplifies each drug's pharmacodynamic effects and increases craving for both substances. However, to date, investigations of prenatal polysubstance use are notably limited in both human and non-human populations. In this review paper, we will address what is currently known about combined exposure to these substances, both directly and prenatally, and identify shared prenatal targets from single-exposure paradigms that may highlight susceptible neurobiological mechanisms for future investigation and therapeutic intervention. Finally, we conclude this manuscript by discussing factors that we feel are essential in the consideration and experimental design of future preclinical SAC studies.
... The inhibition of VEGF expression in glioma cells by CBD represents its antineoplastic and antiangiogenic properties [57]. In this regard, Solinas et al. reported CBD-induced human umbilical vein endothelial cell (HUVEC) migration, in vitro sprouting and invasion, and in vivo angiogenesis in tumor cells; such effects were related to the downmodulation of many angiogenesisrelated molecules [58]. This study showed that the antiangiogenic activity of CBD is effective in counteracting OHSS development. ...
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Studies suggest that ovarian hyperstimulation syndrome (OHSS) can be treated by reducing the level of vascular endothelial growth factor (VEGF). However, due to the side effects of commercially available VEGF-reducing drugs, they can be ruled out as a suitable treatment for OHSS; therefore, researchers are looking for new medications to treat OHSS. This study is aimed at investigating the effects of cannabidiol (CBD) in an OHSS model and to evaluate its efficacy in modulating the angiogenesis pathway and VEGF gene expression. For this purpose, 32 female mice were randomly divided into four groups (eight mice per group): control group, group 2 with OHSS induction, group 3 receiving 32 nmol of dimethyl sulfoxide after OHSS induction, and group 4 receiving 30 mg/kg of CBD after OHSS induction. The animals’ body weight, ovarian weight, vascular permeability (VP), and ovarian follicle count were measured, and the levels of VEGF gene and protein expression in the peritoneal fluid were assessed. Based on the results, CBD decreased the body and ovarian weights, VP, and corpus luteum number compared to the OHSS group ( p < 0.05 ). The peritoneal VEGF gene and protein expression levels reduced in the CBD group compared to the OHSS group ( p < 0.05 ). Also, CBD caused OHSS alleviation by suppressing VEGF expression and VP. Overall, CBD downregulated VEGF gene expression and improved VP in OHSS.
Lung cancer remains the most chronic form of cancer and the leading cause of cancer mortality in the world. Despite significant improvements in the treatment of lung cancer, the current therapeutic interventions are only partially effective, necessitating the continued search for better, novel alternative treatments. Angiogenesis and cancer stem cells play a central role in the initiation and propagation of cancers. Tumor angiogenesis is triggered by an angiogenic switch when pro-angiogenic factors exceed anti-angiogenic components. Although many anti-angiogenic agents are used in cancer treatment, there are therapeutic limitations with significant side effects. In recent years, cannabinoids have been investigated extensively for their potential anti-neoplastic effects. Our previous findings showed that cannabidiol (CBD) could impede tumor growth in mouse models of melanoma and glioblastoma. Importantly, CBD has been suggested to possess anti-angiogenic activity. In this study, we tested, for the first time, inhalant CBD in the treatment of heterotopic lung cancer and whether such potential effects could reduce cancer stem cell numbers and inhibit tumor angiogenesis. We implanted NCI H1437 human lung cancer cells in nude mice and treated the mice with inhalant CBD or placebo. The outcomes were measured by tumor size and imaging, as well as by immunohistochemistry and flow cytometric analysis for CD44, VEGF, and P-selectin. Our findings showed that CBD decreased tumor growth rate and suppressed expression of CD44 and the angiogenic factors VEGF and P-selectin. These results suggest, for the first time, that inhalant CBD can impede lung cancer growth by suppressing CD44 and angiogenesis.
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Colon cancer affects millions of individuals in Western countries. Cannabidiol, a safe and non-psychotropic ingredient of Cannabis sativa, exerts pharmacological actions (antioxidant and intestinal antinflammatory) and mechanisms (inhibition of endocannabinoid enzymatic degradation) potentially beneficial for colon carcinogenesis. Thus, we investigated its possible chemopreventive effect in the model of colon cancer induced by azoxymethane (AOM) in mice. AOM treatment was associated with aberrant crypt foci (ACF, preneoplastic lesions), polyps, and tumour formation, up-regulation of phospho-Akt, iNOS and COX-2 and down-regulation of caspase-3. Cannabidiol-reduced ACF, polyps and tumours and counteracted AOM-induced phospho-Akt and caspase-3 changes. In colorectal carcinoma cell lines, cannabidiol protected DNA from oxidative damage, increased endocannabinoid levels and reduced cell proliferation in a CB(1)-, TRPV1- and PPARγ-antagonists sensitive manner. It is concluded that cannabidiol exerts chemopreventive effect in vivo and reduces cell proliferation through multiple mechanisms.
Macrophage-derived cytokines and other mediators have been implicated in the multiorgan failure of septic shock, but the mechanism of the associated hypotension has remained unresolved. We recently presented evidence that activation of peripheral CB1 cannabinoid receptors contributes to the hypotension in hemorrhagic shock, and that macrophage-derived anandamide (arachidonyl ethanolamide) may be a contributing factor (Wagner et al., Nature, in press). Here we examined whether a similar mechanism may be involved in endotoxic shock induced by E. coli lipopolysaccharide (LPS). In urethane-anesthetized rats, LPS (15 mg/kg i.v.) causes long lasting hypotension and tachycardia. The hypotension, but not the tachycardia, can be prevented by pretreatment with the CB1 receptor antagonist, SR141716A injected iv. (3 mg/kg), but not intracisternally (300 μg/kg). Circulating macrophages isolated from 3 ml of rat blood and exposed to LPS in vivo (15 mg/kg i.v.) or in vitro (200 μg/ml for 90 min) caused SR141716A-sensitive hypotension and SR141716A-resistent tachycardia when injected into normotensive recipient rats, whereas control macrophages caused no such effects. Anandamide could be identified by RP-HPLC/GC/MS in isolated macrophages exposed in vitro to LPS, but not in control macrophages. Another endogenous cannabinoid, 2-arachidonyl glycerol could also be identified in macrophages. These findings indicate that circulating macrophages generate endogenous cannabinoids, which may play a role in LPS-induced hypotension via activation of peripheral CB1 receptors.
Features Discusses fundamental issues in the development of traditional medicines for the benefit of human health The sequential rational approach to the subject matter is a positive differentiating characteristic Contributors are experts in the fields of natural products research, drug discovery, botany and herbal medicine Brings awareness to the many problems facing the development of medicinal herbal products, such as quality control and pharmacokinetic and pharmacodynamic issues Summary The deregulation of dietary supplements and natural products marketing by the FDA has widened the natural products market in Europe and worldwide. Whilst the discussion about the validity of the plant approach to nutrition and diseases treatment continues, the explosion of the use of whatever is considered "natural" has generated concern about effectiveness and danger. Incorporating information ranging from regulatory aspects to clinical trial and vigilance, Herbal Medicines for Human Health: Development and Evaluation of Plant-Derived Medicines: Provides a reference model for those who would like to start the R&D process for a natural product Discusses fundamental issues in the development of traditional medicines for the benefit of human health Takes a sequential rational approach to the subject matter Brings awareness to the many problems facing the development of medicinal herbal products, such as quality control, pharmacokinetic, and pharmacodynamic issues This book takes readers on a rational path for development of efficacious medicinal herbal products. It points out the many problems facing the development of these products, such as quality control, pharmacokinetic, and pharmacodynamic issues. It suggests areas where future developments should occur given healthcare needs and public health considerations.
The tissue inhibitor of metalloproteinases-1 (TIMP-1) has at least 2 independent functions, i.e., regulation of matrix metalloproteinases and erythroid-potentiating activity. We investigated the effects of TIMP-1 over-expression on tumor growth, using cloned lines derived from a TIMP-1-transfected rat breast carcinoma cell line. The in vitro growth rate of the TIMP-1-transfected clones was indistinguishable from that of the control. In contrast, the highest TIMP-1-producing clone (159.0 ng/ml), designated as T-H, formed 4.6-fold larger s.c. tumors than did the control after 14 days. Tumors derived from an intermediate TIMP-1-producing clone (45.4 ng/ml), designated as T-M, were 1.9-fold larger than the control. TIMP-1 over-expression was associated with increased vascular endothelial growth factor (VEGF) expression, vascularization and proliferative activity of the s.c. tumors. Similar to the rat breast carcinoma cells, transfection of TIMP-1 cDNA into the human breast carcinoma cell line MCF-7 resulted in up-regulation of VEGF, with a linear relationship between TIMP-1 and VEGF production in 9 cell clones examined. There was, however, no change in VEGF expression when the rat and human breast carcinoma cell lines were exposed to exogenous recombinant TIMP-1. Our findings suggest that over-expression of TIMP-1 confers growth advantage on breast carcinoma cells in vivo and that up-regulation of VEGF expression may play an important role in this TIMP-1-mediated, growth-stimulating effect. Int. J. Cancer 75:81–87, 1998.Published 1998 Wiley-Liss, Inc.†
Angiogenesis is a frequent hallmark of inflammation; in acute inflammation angiogenesis occurs to revascularize damaged tissues, with subsequent vascular pruning and maturation, which results in restoration of an adequate blood supply to the tissue involved. Angiogenesis is also a characteristic of chronic inflammation, and may be one of the links between inflammation and cancer (Colotta et al. 2009; Kobayashi and Lin 2009). KeywordsAngiogenesis-Endothelial cells-Innate immunity-Specific immunity
Human tissue inhibitor of metalloproteinases-1 (TIMP-1), but not TIMP-2, has potent growth-promoting activity for a wide range of human and bovine cells, TIMP-1 seems to be a new cell-growth factor in serum and to stimulate the cells independently of its inhibitory activity.
The Fifth Edition of the 'Guide to Receptors and Channels' is a compilation of the major pharmacological targets divided into seven sections: G protein-coupled receptors, ligand-gated ion channels, ion channels, catalytic receptors, nuclear receptors, transporters and enzymes. These are presented with nomenclature guidance and summary information on the best available pharmacological tools, alongside suggestions for further reading. Available alongside this publication is a portal at which is produced in close association with NC-IUPHAR and allows free online access to the information presented in the Fifth Edition.