Effect of Royal Jelly on spatial learning and memory in rat model of streptozotocin-induced sporadic Alzheimer's disease

Abstract

It has been recently demonstrated that Royal jelly (RJ) has a beneficial role on neural functions. Alzheimer's disease (AD) is associated with impairments of learning and memory. Therefore, the present study was designed to examine the effect of RJ on spatial learning and memory in rats after intracerebroventricular injection of streptozotocin (icv-STZ).
Rats were infused bilaterally with an icv injection of STZ, while sham rats received vehicle only. The rats were feed with RJ-contained food (3% w/w) (lyophilized RJ mixed with powdered regular food) or regular food for 10 days. Then spatial learning and memory was tested in the rats by Morris water maze test.
Results showed that in icv-STZ group latency and path length were increased as compared to sham group, also icv-STZ rats less remembered the target quadrant that previously the platform was located; however, these were protected significantly in STZ group that received RJ-containing food.
Our findings support the potential neuroprotective role of RJ and its helpful effects in AD.

Full text

Advanced Biomedical Research | April - June 2012 | Vol 1 | Issue 2 1
Background: It has been recently demonstrated that Royal jelly (RJ) has a beneficial role on neural functions.
Alzheimer’s disease (AD) is associated with impairments of learning and memory. Therefore, the present study
was designed to examine the effect of RJ on spatial learning and memory in rats after intracerebroventricular
injection of streptozotocin (icv-STZ).
Materials and Methods: Rats were infused bilaterally with an icv injection of STZ, while sham rats received
vehicle only. The rats were feed with RJ-contained food (3% w/w) (lyophilized RJ mixed with powdered
regular food) or regular food for 10 days. Then spatial learning and memory was tested in the rats by
Morris water maze test.
Results: Results showed that in icv-STZ group latency and path length were increased as compared to
sham group, also icv-STZ rats less remembered the target quadrant that previously the platform was
located; however, these were protected significantly in STZ group that received RJ-containing food.
Conclusions: Our findings support the potential neuroprotective role of RJ and its helpful effects in AD.
Key words: Alzheimer’s disease, rat, Royal jelly, spatial learning and memory, streptozotocin
Address for correspondence:
Dr. Parham Reisi, Department of Physiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. E‑mail: p_reisi@med.mui.ac.ir
Received: 18‑01‑2012, Accepted: 13‑03‑2012
Abstract
Effect of Royal Jelly on spatial learning and memory in
rat model of streptozotocin‑induced sporadic Alzheimer’s
disease
Zohre Zamani, Parham Reisi1, Hojjatallah Alaei2, Ali Asghar Pilehvarian3
Applied Physiology Research Center, 1Department of Physiology, School of Medicine and Biosensor Research Center, 2Department of
Physiology, School of Medicine Isfahan University of Medical Sciences, 3Department of Basic Sciences,
Isfahan Payame Noor University, Isfahan, Iran
Original Article
Access this article online
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Website:
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DOI:
10.4103/2277-9175.98150
ABR_24_12R9
INTRODUCTION
Alzheimer’s disease (AD) is a disorder with a deadly
outcome and unknown etiology in human that aficted
many people worldwide.[1] This disease is characterized
Copyright: © 2012 Zamani. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction
in any medium, provided the original author and source are credited.
How to cite this article: Zamani Z, Reisi P, Alaei H, Pilehvarian AA. Effect of Royal Jelly on spatial learning and memory in rat model of streptozotocin-induced
sporadic Alzheimer's disease. Adv Biomed Res 2012;1:26.
by a progressive and irreversible neurodegeneration in
various brain regions, especially in the hippocampus,
which is an important area for memory and cognition.[2,3]
The increased production and accumulation of amyloid‑β
peptide (Aβ) contribute to progressive neuronal
degeneration.[4,5] Therefore, Alzheimer’s is associated
with decits in cognitive abilities such as learning
and memory in human beings.[5] Currently, there isn’t
any conclusive treatment for AD and the common
treatments just slow the progression of the disease and
manage some of the symptoms.[3]
Royal jelly (RJ) is an essential food for the honey
bee young larva and the queen herself, it thought to
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Zamani, et al.: Effects of Royal jelly on spatial learning and memory in Alzheimer's rat
2 Advanced Biomedical Research | April - June 2012 | Vol 1 | Issue 2
play important nutritional roles in the queen.[6] It is
a viscous substance secreted by the hypopharyngeal
and mandibular glands of the worker honey bee of the
species, Apis mellifera. It has been reported to have a
variety of biological activities toward various types of
cells and tissues of animal models.[6]
RJ is composed of proteins, carbohydrates, lipids
(including sterols and fatty acids), and traces of
mineral salts and vitamins.[7] This material has been
determined to exhibit a variety of pharmacological
activities including antitumor, antimicrobial,
vasodilative, and hypotensive activities, as well
as growth stimulating and infection preventing,
antihypercholesterolemic and anti‑inflammatory
activities. Several studies have been shown the
antioxidant activity of RJ.[8] For these reasons, for
more than 30 years, RJ has been used commercially
in medical products, healthy foods, and cosmetics, to
a wide extent.[8]
In addition, RJ facilitates the differentiation of all
types of brain cells including neurons from cultured
neural stem/progenitorcells (NS/NPCs).[6] RJ or its
components would facilitate in vivo neurogenesis
in the hippocampal dentate gyrus (DG).[9] However,
there are no reports so far showing the effects of RJ
on cognition behaviorally, especially when there is a
background of neurodegenerative disease.
One of the relevant animal models of Alzheimer’s
disease is intracerebroventricular streptozotocin
(icv‑STZ) injection.[1,10] Streptozotocin is a diabetogenic
drug that used to induce diabetes mellitus,[11] and recent
evidence suggests that the intracerebroventricular
(icv) injection of streptozotocin (STZ) to rats in a
subdiabetogenic dose causes prolonged impairment
of memory and brain metabolic process, as a sporadic
dementia of the Alzheimer’s type (SDAT) that
comprises more than 90% of Alzheimer’s patients in
the world.[1,10] Therefore, the aim of this study was
to evaluate the effect of RJ on learning and memory
in rats after intracerebroventricular injection of
streptozotocin (icv ‑STZ).
MATERIALS AND METHODS
Male Wistar rats (320 ± 20 g) were housed four per
cage and maintained on a 12 h light–dark cycle in an
air‑conditioned constant temperature (23 ± 1°C) room,
with food and water made available ad libitum. The
Ethic Committee for Animal Experiments at Isfahan
University approved the study and all experiments were
conducted in accordance with the National Institute
of Health Guide for the Care and Use of Laboratory
Animals (NIH Publications No. 80‑23) revised 1996.
Animals were divided into four groups (n = 9). The
rst group was the sham control (sham group), the
second group consisted of sham animals receiving
RJ‑contained food (sham‑RJ group), the third group
was the ICV‑STZ control (lesion group), and the
fourth group consisted of ICV‑STZ animals receiving
RJ‑contained food (lesion‑RJ). Rats in the control
groups received regular food.
Five days after surgical procedure, for recovery, rats
received RJ‑contained food for 10 days and then spatial
learning and memory was tested in the rats by Morris
water maze test.
RJ was administrated in the form of a mixed food
prepared by adding freeze‑dried RJ at 3% (w/w) in
regular food powder. The mixture and pure regular
food were made into pellets with a small amount of
water and desiccated under vacuum overnight.[9,12]
Surgical procedure
The rats were anesthetized with chloral hydrates
(400 mg/kg, i.p.) and their heads were fixed in
a stereotaxic frame. A heating pad was used
to maintain body temperature at 36.5 ± 0.5°C.
The skull was exposed and two small holes were
drilled and injection canula was lowered into the
lateral ventricles (anterior‑posterior = ‑0.8 mm;
medial‑lateral = ±1.6 mm; and dorsal‑ventral =
‑4.2 mm with reference to bregma).[13] Injection
canula was connected to a Hamilton syringe attached
to a microinjector unit. The lesion group received
a bilateral ICV injection of STZ (1.5 mg/kg in 4 µl
per site) as in previous studies.[10] The sham group
underwent the same surgical procedures, but the same
volume of saline was injected instead of STZ.
Morris water maze test
The circular tank (180 cm in diameter) was lled with
water (22 ± 2°C) made opaque and was surrounded by
a variety of extra‑maze cues. The tank was divided into
four quadrants and four start positions were located at
the interactions of the quadrants. Data were recorded
using custom software (Radiab 1). Twenty‑four hours
before water maze testing, all rats were habituated to
the water and apparatus.
In the spatial acquisition phase, the rats learned to
nd a submerged platform using extra‑maze cues.
A transparent Lucite platform (10 × 10 cm) was
submerged 2 cm underneath the water in north‑east
quadrant of the tank, where it remained for all spatial
trials [Figure 1a]. Each rat participated in 16 trials,
which were organized into daily block of four trials
(1 trial/start position within a block) for 4 consecutive
days. For each trial, the rat was given a maximum time
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Zamani, et al.: Effects of Royal jelly on spatial learning and memory in Alzheimer's rat
Advanced Biomedical Research | April - June 2012 | Vol 1 | Issue 2 3
of 60 s to locate the platform, after which it remained
there for 30 s. If the rat did not locate the platform
within 60 s, it was guided to it by the experimenter.
The next trial started immediately after removal from
the platform. Escape latencies (s), swim distance (cm),
and swim speed (cm/s) were recorded.
In the retention phase, 1 day and 1 week after
the spatial acquisition phase, 60‑s probe trial was
conducted to examine how well the rats had learned
the exact location of the platform. During this trial, the
platform was removed from the tank. The quadrant
time (percent time spent in the training quadrant)
was recorded during the probe trial.[14] To test possible
decits in sensory–motor processes, rats were tested
in the water maze with a visible platform on a new
location on the nal day of training.[15]
Statistical analysis
Data were analyzed using the SPSS 16 for Windows.
Results are given as mean ± S.E.M. The escape
latencies, path length, and swim speed were analyzed
with three‑factor mixed ANOVA for between‑subjects
differences between sham and lesion (“ICV‑STZ”
effect), between non‑RJ and RJ (“RJ” effect), and
ICV‑STZ*RJ effect interaction and repeated measures
(within subjects) effects across block interval 1 to 4
(“BLOCK” effect). The probe trial data for percentage
of time spent in each of the four zones were analyzed
by multivariate ANOVA.
RESULTS
All rats except lesion group showed a reduction in
escape latencies (BLOCK effect, F(3,96) = 46.157,
P < 0.001) and a reduction in the distance swam to
locate the platform (BLOCK effect, F(3,96)=25.259,
P < 0.001) across blocks of trials, indicating spatial
acquisition. Sham groups found the platform more
quickly than lesion groups [28.9 ±1.8 s and 43.54 ± 1.6 s,
respectively; ICV‑STZ effect, F(1,32) = 36.265,
P < 0.001] and took shorter paths to the platform
[637.7 ± 48.1 cm and 958.6 ± 43.6 cm, respectively;
ICV‑STZ effect, F(1,32) = 24.46, P < 0.001]. The rats
that received RJ contained food, found the platform
more quickly than the rats that received regular food
[30.48 ± 1.85 s and 41.94 ± 1.58 s, respectively; RJ
effect, F(1,32) = 22.2, P < 0.001] and took shorter paths
to the platform [687.4 ± 49.4 cm and 908.86 ± 42.9 cm,
respectively; RJ effect, F(1,32) = 11.65, P <0.01]. Also,
RJ contained food maintained both the escape latencies
[ICV‑STZ*RJ effect interaction, F(1,32) = 0.22,
P = 0.64] and the pathlengths [ICV‑STZ*RJ effect
interaction, F(1,32) = 0.06, P = 8] in lesion rats
[Figures 1b and 1c].
Swim speed did not show any change during
continuous day [BLOCK effect, F(3,96) = 2.01,
P = 0.118] and there wasn’t any difference between
the groups [Figure 1d].
Results from the probe trial as measured by the
mean percentage (%) time spent in each of the four
zones indicated that 1 day after acquisition phase the
sham groups spent more time in zone 1, where the
platform was previously located, than the ICV‑STZ
groups [38.14 ± 2.58% and 23.41 ± 2.33%, respectively;
ICV‑STZ effect, F(1,32) = 31.02, P < 0.001]. The
mean percentage (%) time spent in zone 1 was not
signicantly different between the rats that received
RJ‑contained food and the rats that received regular
food [36.71 ± 2.65% and 24.83 ± 2.26%, respectively;
RJ effect, F(1,32) = 3.564, P = 0.068]; however,
RJ‑contained food maintained that in lesion rats
[ICV‑STZ*RJ effect interaction, F(1,32) = 0.85,
P = 0.36] [Figure 2a].
One week after acquisition phase, the sham groups
spent more time in zone 1 than the ICV‑STZ groups
[38.19 ± 2.05% and 22.78 ± 1.86%, respectively;
ICV‑STZ effect, F(1,32) = 17.94, P < 0.001]. The rats
that received RJ‑contained food spent more time
in zone 1 than the rats that received regular food
[33.1 ± 2.1% and 27.87 ± 1.8%, respectively; RJ effect,
F(1,32) = 11.67, P < 0.01]; also, RJ‑contained food
maintained that in lesion rats [ICV‑STZ*RJ effect
interaction, F(1,32) = 0, P = 0.99) [Figure 2b].
DISCUSSION
The present results showed that use of RJ is effective
in signicant improvement of learning and memory
defects that induced with icv‑STZ in rats.
Like previous studies, our results demonstrated that
ICV‑STZ causes impairment of learning and memory in
rats.[16] The study has been shown that the application
of STZ in a subdiabetogenic dose in rats brain leads to
damage to glucose’s metabolism and causes reduction in
adenosine triphosphate (ATP/ADP ratio). This may be
calculated by the imbalance between intake and output
of energy.[17] It has been shown that acetylcholine is
necessary to formation and improvement of memory;
its synthesis needs to glucose metabolism and insulin
in order to control choline acetyltransferase (ChAT)
activity.[1] Previous researches have demonstrated that
icv‑STZ causes reduced energy metabolism/oxidative
stress leading to cognitive dysfunction by inhibiting the
synthesis of acetyl‑CoA and therefore acetyl‑choline
synthesis. Also, streptozotocin causes reduced ChAT
activity in hippocampus and increased cholinesterase
(ChE) activity in the rat’s brains.[1]
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Zamani, et al.: Effects of Royal jelly on spatial learning and memory in Alzheimer's rat
4 Advanced Biomedical Research | April - June 2012 | Vol 1 | Issue 2
In addition, like in AD, icv‑STZ through prolonged
impairment of brain energy metabolism and oxidative
damage increases the inammatory cytokines, such
as interleukin‑8 (IL‑8) and interleukin‑1 (IL‑1). This
inammatory cytokines and severe oxidative stress
lead to mitochondrial dysfunction and increase the
risk of cell apoptosis in the brain, particularly in the
hippocampus.[18,19]
As a secondary observation, our results demonstrated
that use of RJ in rats enhanced learning and
memory performance. Previous studies showed that
RJ stimulates production of neurotrophic factors,
such as glial cell line‑derived neurotrophic factor
(GDNF), and has neuroprotective effects in the adult
brain, especially in hippocampus.[6] These studies
are compatible with the results from our behavioral
study.
One of unique components in RJ is 10‑hydroxy‑
trans‑2decanoic acid (HDEA), an unsaturated fatty
acid. Because HDEA is a small unsaturated fatty
Figure 1: Effects of Royal jelly (RJ) contained food on performance during the spatial acquisition of Morris water maze test in rats with
intracerebroventricular injection of streptozotocin. Schematic diagram of tank and site of the platform (a). The escape latencies (b), the path length
(c), and the swim speed (d) at different days to reach the platform. Each point represents the day mean ± SEM of 4 swims. For latency and path
length, lower numbers indicate better performance (*P < 0.05 and **P < 0.01 with respect to the sham group, †P < 0.05 signicant difference
between the lesion and the lesion-RJ groups; n = 9).
d
c
b
a
Figure 2: Effects of Royal jelly (RJ) contained food on performance during the probe trial in rats with intracerebroventricular injection of
streptozotocin, quadrant time, as measured by mean percentage (%) time spent in each of the four zones, 1 day (a) and 1 week (b) after spatial
acquisition phase. Zone 1 was the training quadrant that previously platform was located (*P < 0.05 and **P < 0.01 with respect to the sham
group, †P < 0.05 signicantly difference between the lesion and the lesion-RJ groups; n = 9).
b
a
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Zamani, et al.: Effects of Royal jelly on spatial learning and memory in Alzheimer's rat
Advanced Biomedical Research | April - June 2012 | Vol 1 | Issue 2 5
acid, it can pass through blood–brain barrier. It has
been demonstrated that HDEA mimics the effects
of brain‑derived neurotrophic factor (BDNF) and
probably stimulate neurogenesis in the mature
brain.[20] Other active component in RJ is adenosine
monophosphate (AMP) N1‑oxide that is effective in
neuronal differentiation of PC12 cells.[7,20]
One of the factors which play an effective role in
pathogenesis of ageing and neurodegenerative
diseases is oxidative stress, which is an imbalance
between free radicals and antioxidant system.[21,22]
Oxygenate radicals can attack to proteins, nucleic
acids, and lipid membranes and accordingly interrupt
the integrity and performance of the cell.[23] The
brain tissue contains a lot of unsaturated fatty acids
which are especially vulnerable for free‑radical
attacks.[24] Therefore, antioxidant substances can
play an important role in prevention and cure of
neurodegenerative diseases.[10,16] Recently, studies
have suggested that RJ has free‑radical scavenging
capacity and is a highly efcient antioxidant.[25,26] RJ
has been shown that inhibits lipid proxidation both
in vitro and in vivo.[27]
RJ has a potent ability to improve insulin resistance
and this is a valuable effect in AD.[28] Same to AD or
ageing brain, ICV‑STZ in rats causes desensitization
of insulin receptors[29] and it has demonstrated
that ICV‑STZ through damage of the neuronal
insulin receptor induces progressive deteriorations
in the mental capacities of learning, memory, and
cognition.[1]
In conclusion, our ndings show that RJ protects
spatial learning and memory performance in AD and it
has positive effects on neural functions and cognition.
ACKNOWLEDGMENTS
This research was supported by the Applied Physiology
Research Center of Isfahan University of Medical Sciences,
Isfahan, Iran. Also, the authors wish to thank Isfahanhoney.
com Corporation for preparation and standardization of
royal jelly.
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