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A REVIEW ON HELICOBACTER PYLORI: ITS BIOLOGY, COMPLICATIONS AND MANAGEMENT
Review Article
ASHWINI Pa, SUMANA MNb*2, SHILPA Uc, MAMATHA Pc, MANASA Pb, DHANANJAYA BLd, FARHAN ZAMEERe,
NAGENDRA PRASAD MNc*1
aDepartment of Microbiology, Faculty of Life Sciences, JSS University, bJSS Medical College and Hospital, JSS University, cSri
Jayachamarajendra College of Engineering, JSS Technical Institution Campus, Manasagangothri, Mysore 570006, Karnataka, India,
dDepartment of Toxicological and Drug Discovery Unit, Jain University, Bangalore 562112, Karnataka, India, e
Received: 28 Oct 2014 Revised and Accepted: 25 Nov 2014
Department of Studies in
Biotechnology, Microbiology and Biochemistry, SBRR Mahajana First Grade College, JL Puram and Mahajana Life Science Research Centre,
Mysore 570012, Karnataka, India
Email: npmicro8@yahoo.com
ABSTRACT
Helicobacter pylori (HP) emergences in gastro intestinal tracts of human beings are one of the major health concerns in recent times. The infection
in the later stages can lead to peptic ulcers and gastric cancers. HP is second commonly encountered pathogen in humans next only to Streptococcus.
The virulence of the pathogen is further strengthened by its capability in forming biofilms. There are various therapies to treat this infection which
are classified as first line, second line and third line, but are not free from the serious antibiotic resistances which normally are encountered in
treating bacterial diseases. Vowing to above reason, it is necessary to search for alternative management strategies with lesser side effects and
complications like plant based drugs and designer nutraceutical products which includes herbal extracts, probiotics, phytomedicines, antioxidants,
essential oils, flavonoids so-on. In the present study, we have reviewed on the thorough understanding on biology, complications and management
of H. Pylori and its infections.
Keywords: Peptic ulcers, H. Pylori, Biofilms, Cag A, Vac A, Phytomedicines.
INTRODUCTION
Helicobacter pylori a microaerophilic, gram negative bacteria
belonging to the family Helicobacter, is found mainly in the gastro
intestinal tract of human beings. It infects about 50% of world
population, out of which 10% develop peptic ulcer and around 1%
develop gastric cancer [1]. Studies done by Marshell and Robin have
provided vital hints in its role in the development of gastritis and
peptic ulcer diseases. H. pylori infection varies according to the
geographical conditions and different population. Among infected
people only few develop gastritis depending upon expression of
specific virulence factor by bacteria and host immune response [2].
Helicobacter pylori infection is mediated by the number of factors
such as flagella, heamagglutin, BabA gene expression and virulence
factors (CagA, Vac) [3]. H. pylori can form a biofilm on gastric
epithelial cells which contribute in adapting to the changing
environment in gastric mucosa, helping in longer survival and fight
against immune system [4] Lux S gene helps in quorum sensing in
biofilm [5]. These are the reasons for an initiation of gastritis which
if not treated may lead to clinical complications like peptic ulcer,
gastric cancer, gastro-oesophageal diseases, non-ulcer dyspepsia
and extra-intestinal diseases [6]. Numerous diagnostic methods exist
to detect infection that includes endoscopic and non-endoscopic
methods, Technique used may be direct (culture, microscopic
demonstration) or indirect methods (urease test, stool culture, PCR)
[7]. To overcome this infection, different treatment regimes are used
which includes the first line therapy (concomitant therapy and
hybrid therapy), second line therapy bismuth-containing quadruple
therapy and levofloxacin-containing therapy and third line
therapy(culture-guided therapy) [8]. Severe genetic variability
shown by H. pylori bestows it with antibiotic resistance owing to
search for alternative safer drugs.
Morphology
The basic morphology of H. pylori have specific feature of S-shape
with polar, sheathed flagella, which are varied by its size and the
number of spirals/turns [9]. Certain aspects of the ultra-structural
detail of the Helicobacter, e. g., sheathed flagella and surface urease,
have been implicated in their ability to survive in hostile
environments such as the acidic gastric mucosa and ability to induce
disease. Helicobacter pylori in vivo and under optimum in vitro
condition is an S-shaped bacterium with 1 to 3 turns, 0.5 ×5 μm in
length, with a tuft of 5 to 7 polar sheathed flagella [10].
Biofilm formation by H. pylori
Biofilms are formed when bacteria transform from planktonic type
to a form, in which organisms are firmly adhered to abiotic and
biotic surfaces and these biofilms play an important role in bacterial
virulence. H. pylori has the ability to form biofilm in the
gastrointestinal tract. It is the second most common organism to
cause human infection next to Streptococcus mutants [4]. Flagella
help in adherence of Helicobacter pylori to gastric epithelial cells,
LuxS gene is responsible for the production of auto inducer2(AI-2)
which is the quorum sensing molecule helping the organism to
communicate with each other to know about their cell density and
an external environment. Vir B protein helps bacteria to spread and
form biofilm over the surface [11].
Biofilm biomass mainly consists of extracellular polymeric
substances (EPS) matrix up to 90% and is a mixture of EPS, cDNA,
proteins and some amount of other macromolecules [12]. The EPS
helps Helicobacter pylori in protecting itself against adverse
conditions particularly pH changes [13]. According to studies done
by Hideoyonizawa et al. [12] ‘TK1402’ strain of H. pylori showed
significantly higher level of biofilm formation compared to other
strains and Percival et al., referred biofilm’s role in longer survival of
the bacterium by fighting against an immune system of host and
chemotherapeutics [5].
Gastric Helicobacter species
Gastric Helicobacter species have adjusted to the harsh condition found
in gastric mucosal surface, the stomach of all mammals can be colonized
by members of genus Helicobacter [14] as indicated in table 1.
Pathogenesis of Helicobacter pylori
Colonization of H. pylori alone will not cause diseases by itself, but
several factors contributes to this like smoking, alcohol, Non-
steroidal Anti-inflammatory drug, Proton Pump Inhibitors and host
factors like gene polymorphism and immune response[16]. H. pylori
infection can be transmitted form one person to other by three basic
mode viz., iatrogenic mode, faecal-oral mode, oral-oral mode [17].
Adhesion of H. pylori is highly specific to gastric epithelium [18].
International Journal of Pharmacy and Pharmaceutical Sciences
ISSN- 0975-1491 Vol 7, Suppl 1, 2015
Innovare
Academic Sciences
Ashwini et al.
Int J Pharm Pharm Sci, Vol 7, Suppl 1, 14-20
“Drugs from Nature: Plants as an important source of pharmaceutically important metabolites”
Guest Editor: Dr. Dhananjaya Bhadrapura Lakkappa
15
Outer membrane protein BabA encoded by gene babA2 binds to
blood group antigen lewisb present on an epithelial cell membrane.
H. pylori with babA2+
Virulence factors of H pylori
strain associated with the increase in risk of
duodenal ulceration and gastric adenocarcinoma in association with
VacAS1 and Cag A strains increasing the risk of peptic ulcer and
gastric cancer [19].
Cag A
The main virulence determinant of H. pylori is a pathogenicity island
called Cag. Its pathogenicity island-positive strains have been closely
associated with peptic ulcer and gastric ulcers [15]. Genes in the cag
pathogenicity island encode a type IV secretion system through effector
protein and CagA is translocated into the host cell cytoplasm [20].
Vac A
Vac A, the vacuolating cytotoxin encoded by the Vac A gene, a strong
marker for H. pylori virulence which causes vacuolization of
epithelial cells, disruption of the endo somal/lysosomal pathway,
interference with cell signalling and the inhibition of T-cell
proliferation [21]. Vac A, has mature 87-KDa monomer in different H
pylori strains, but its cytotoxic activity has been shown to occur in
only 50% of H pylori strains [20]. Patients identified as VacA
seropositive were shown to have an increased risk of gastric
carcinoma that occurred in conjunction with the s1m1
polymorphism [22].
Biochemical characteristics of H. pylori
H. pylori infection is usually life long as it has the capacity to adjust
to natural habitat like mucus layer over the gastric epithelial cell. H.
pylori lack several pathways which are commonly present in less
specialized bacteria like enteric bacteria [23]. The organism can be
cultured only in specific chemically defined medium containing
amino acids arginine, histidine, iso leucine, methionine,
phenylalanine and valine [24]. H. pylori are urease, catalase, oxidase
positive [25] and is microaerophilic utilizing O2
Diagnosis of H. pylori
as terminal electron
acceptor [24]. Ammonia plays very important role in both nitrogen
metabolism and acid resistance. Ammonia production is mainly
through high urease activity, which acts as key component in
nitrogen metabolism, acid resistance and virulence factor [26, 27]
Diagnostic tests for H. pylori infection include endoscopic and
nonendoscopic methods. The techniques used may be direct (culture,
microscopic demonstration of the organism) or indirect methods
(using urease, stool antigen, or an antibody response as a marker of
disease)[7]. The choice of test depends to a large extent on availability,
cost and includes a distinction between tests used to establish a
diagnosis of the infection and those used to confirm its eradication.
Culture methods
H. pylori may be routinely isolated by culture from human gastric
biopsy samples. The organism requires a microaerophilic
environment and complex media. Variety of basal media and
different supplements has been proposed for isolation of the
organism. However, Columbia Agar Base or Brain Heart Infusion
(BHI) broth supplemented with blood or serum has been found
adequate for culturing [7]. They typically grow best in freshly
prepared moist media incubated in a warm (37 °C) atmosphere with
5%-10% CO2, 80%-90%N 2 and 5%-10% O 2
Urease test
. The best specimens for
isolation of H. pylori are biopsy samples obtained during endoscopy.
H. pylori are known for the production of urease enzyme. The test
involves utilization of H. pylori urease to identify active organisms
[28]. Sensitivity of greater than 93% and specificity of 98% is
reported for urease testing.
Urea breath test
Urea breath test is considered as the gold standard for the diagnosis
of H. pylori. This test gives accurate and proper result compared to
other tests. In this test 13C or 14
Stool culture
C urea is fed to patient where in
stomach it’s broken down by urease enzyme of H. pylori [29].
Inactive coccoid form of H. pylori in stomach will not give the
positive urea breath test.
One of the suspected routes of transmission of H. Pylori is oro-fecal
making it a candidate to be isolated from faecal sample. H. pylori are
susceptible to biliary salts and there is a great competition with
other numerous bacteria present in the stool. Dore et al.[30] have
reported successful isolation of H. pylori after treating with bile
sequestering agent cholestyramine before plating on culture
medium. A meta-analysis revealed that the global sensitivity and
specificity of stool antigen tests are 94% (95%CI: 93-95) and 97%
(95%CI: 96-98), respectively.
PCR
PCR is used not only for the detection of bacterium but also for
characterization of pathogenic genes and specific mutations
associated with antimicrobial resistance. The highly conserved 16S
rRNA gene in bacteria exhibits sequences which are shared by
different species of Helicobacter. H. pylori specific DNA in these
specimens, target genus specific gene (C97 and C98) and conserved
region of Vac A gene. Rocha et al. and Cirak et al. suggested that any
specimens should be designated positive for H. pylori when there is
amplification of two different conserved target genes [31, 32].
Complications of H. pylori infection
Gastritis: is a condition where stomach lining is inflamed. There are
three stages of gastritis acute, chronic and atrophy phase. Acute
phase is subclinical stage, where H. pylori penetrate through viscid
mucous layer reaching epithelial cell where it multiplies. Epithelial
cells react to this by mucus depletion, cell exfoliation and
compensatory regenerative changes [33] If immune response fails to
eradicate the infection, in next 3 or 4 weeks there will be change
from acute phase to chronic phase. In this phase the production of
cytokine and specific anti-H. pylori antibodies by B-cell proliferation
and plasma cell differentiation results in production of Ig-M
antibodies and complement fixing antibody. But still if it fails to
eliminate infection [34]. Atrophy is the last stage of gastritis where
loss of glandular tissue takes place due to repeated or continuous
mucosal injury leading to progressive mucosal damage, leading to
erosion or ulceration of the mucosa [35].
Peptic ulcer
H. pylori causes an inflammatory response in gastric mucosa by
inducing epithelium derived cytokines mainly interleukin 8 (IL8)
and IL 1β [36] by the action of neutrophils, macrophages, lysosomal
enzymes, leukotrienes (LT), and reactive oxygen species hampering
mucosal defence and initiating the immuno pathogenetic process of
ulcer formation. Urease catalyses production of ammonia, when
there is an increase in concentration leading to the formation of
toxic complex such as ammonic chloride, along phospholipases A
and C impairs the phospholipid-rich layer in the mucosa that
maintains mucosal hydration and integrity of the gastric epithelial
barrier leading to ulcers [37].
Gastric cancer
GC is the second cause for cancer related death worldwide,
accounting nearly 11% of cancers in male and 7% in female [38]. H.
pylori infection is recognized as type 1 carcinogen by International
Agency of Research on cancer [39]. Multiple mechanisms are
involved in carcinogenesis, among them important are production of
relative oxygen species that causes DNA damage and mutation.
Hypermethylation of gene promoter (CpG) island is associated with
H. pylori infection and deregulation of many pathways; among them
some are important pathways such as p53 pathway,PI3 kinase/Akt
pathway, Wnt pathway and NF-κB pathway [40].
Gastroesophageal reflux diseases (GERD)
Is a multifaceted disorder where gastric acid coming up from the
stomach into the oesophagus [41]. The Montreal consensus
Ashwini et al.
Int J Pharm Pharm Sci, Vol 7, Suppl 1, 14-20
“Drugs from Nature: Plants as an important source of pharmaceutically important metabolites”
Guest Editor: Dr. Dhananjaya Bhadrapura Lakkappa
16
conference defined (GERD) as “a condition which develops when the
reflux of gastric contents causes troublesome symptoms and/or
complication” [42]. GERD symptoms are seen in 25-40% of the
general population, the relationship between GERD and H. pylori are
documented by many researchers and infection varies by geographic
location [43].
Non ulcer dyspepsia or functional dyspepsia
A symptom of upper gastrointestinal distress, without any identified
structural abnormalities during diagnosis [15]. Uninvestigated
dyspepsia is defined as presence of dyspepsia symptoms for which
no further diagnostic evaluation has been performed [44].
There are many possible causes for this, like lifestyle factors, stress,
altered visceral sensation, increased serotonin sensitivity, alteration
in gastric acid secretion, gastric emptying and psycho-social
impairment. H. pylori infection may be one of the factors among
multifactorial etiology of the diseases [45]. Studies carried out in
Kuala Lumpur by Goh et al. reveals that H. pylori was found in 31.2%
of the non-ulcer dyspepsia patients [46].
Table 1: Characteristics of some selected Helicobacter species [15]
Species
Primary mammalian host
Pathology
Gastric Helicobacter spp. H.
pylori
Human, primate
Gastritis, peptic ulcer diseases, gastric adenocarcinoma, MALT lymphoma
H. felis
Cat, dog, mouse
Gastritis in natural host; may cause peptic ulcers or gastric
adenocarcinoma in mouse
H. mustelae
Ferret
Gastritis, peptic ulcer diseases, gastric adenocarcinoma, MALT lymphoma
H. acinonychis
Cheetah, tiger, other big cats
Gastritis, peptic ulcer diseases
H. heilmannii
Human, dog, cat, monkey,
cheetah, rat
Gastritis, dyspeptic symptoms, MALT lymphoma
Enterohepatic Helicobacter spp.
H. hepaticus
Mouse, other rodents
Proliferative typhlocolitis, hepatitis, hepatocellular carcinoma
Table 2: An outline of different therapeutic lines against H. pylori infection [8]
First line
Second line
Third line
If CLR-R*>20%
Concomitant
(10 days PPI
**
Or
standard dose),clarithromycin
(500 mg), amoxicillin(1g) and
metronidazole(500 mg)
Sequential
(5days dual therapy: PPI(standard dose)
and amoxicillin (1g) fallowed by a 5-day
triple therapy with a PPI(standard dose),
clarithromycin (500 mg) and metronidazole
(500 mg)
Levofloxacin-based triple therapy(10 days
for levofloxacin(500 mg), amoxicillin (1g)
and a PPI (standard dose)
Quadruple
10 days rabeprazole(20 mg),bismuth subcitrate
(300 mg), amoxicillin (500 mg) and
levofloxacin(500 mg)
Or
Quadruple
(7days lansoprazole(30 mg), tripotassium
dicitratobismuthate(240 mg), furazolidone (200
mg) and tetracycline (1g).
If CLR-R<20%
Hybrid (dual-concomitant)
(7days dual therapy: PPI (standard dose)
and amoxicillin (1g) followed by 7days
concomitant quadruple therapy:
PPI(standard dose), amoxicillin (1 g),
clarithromycin(500 mg) and metronidazole
(500 mg)
Levofloxacin-based triple therapy
(10 days for levofloxacin(500
mg),amoxicillin(1g),
and a PPI(standard dose)
Quadruple
10 days rabeprazole(20 mg), bismuth
subcitrate(300 mg),amoxicillin(500 mg),and
levofloxacin(500 mg)
Or
Quadruple
7 days lansoprazole(30 mg), tripotassium
dicitratobismuthate(240 mg),furazolidone (200
mg) and tetracycline (1g)
CLR R=Clarithromycin resistance. **PPI= proton pump inhibitor. **
Standard empirical third line therapy is lacking.
Fig. 1: Clinical manifestation of H. pylori infection leading to cancer [48]
Ashwini et al.
Int J Pharm Pharm Sci, Vol 7, Suppl 1, 14-20
“Drugs from Nature: Plants as an important source of pharmaceutically important metabolites”
Guest Editor: Dr. Dhananjaya Bhadrapura Lakkappa
17
Extra-intestinal diseases
The H. pylori infection has association with other diseases along with
intestinal diseases because proinflammatory nature of H. pylori
inflammation could be the common and important feature of
pathogenesis. The association of many diseases with H. pylori
proposes that there would be a common pathway existing in all the
conditions [47]. These includes cardiovascular diseases,
hepatobiliary diseases, respiratory tract disorder like laryngeal
cancer, lung cancer, dermatological disorder like chronic urticaria,
haematological disorder like immune thrombocytopenic purpura,
henoch-schonlein purpura, iron deficiency anaemia, cobalamin
deficiency and appetite regulation [15].
However further research should be carried out in detail to draw
a proper conclusion between H. pylori infection and above
diseases [6].
Treatments for Helicobacter pylori infection
Presently there are three main therapies followed by clinicians in
treatment of H. pylori infections: first line, second line and third line
therapy [8].
Fig. 2: Overview on Helicobacter pylori: Biology, Complications and Management-(A). Interaction of the H. py lori with host, possible
consequences and complications. (B). Stages of Biofilm development. (C). Herbal management of pathogenesis and possible target
mechanism [80, 81]
First line therapy
First line therapy is a combination of PPI (proton pump inhibitor) along
with antibiotics amoxicillin or metronidazole and clarithromycin[49]. A
study suggested that eradication rate of standard triple therapy were
more than 90% [50] but recently the efficacy is decreased worldwide
due to increased rate of clarithromycin resistance of H. Pylori [51]. This is
considered as main cause for failure in first line therapy [52]. First line
therapy involves three methods concomitant therapy, sequential
therapy, hybrid therapy [53].
Second line therapy
First line therapy approximately failed in 20% of patients, making
way for second line therapy [54]. Basically second line therapy is a
quadruple therapy that can be divided into two different regimes,
with and without bismuth salt, bismuth based quadruple therapy
consisting of a PPI, bismuth, tetracycline and metronidazole [55].
Bismuth based therapy showed no significant increase in side effect
other than dark stool [56]. Levofloxacin based therapy showed 81%
efficacy when study was conducted in Spain with 300 patients in 10
days trial [57] but there was increase in rate of fluoroquinolones
resistance among H. pylori strains [58] leading to limit the use of
levofloxacin in H. pylori eradication in second line therapy (table 2).
Third line therapy
Patients who are failing in first and second line therapy are
suggested for third line therapy (table 2). An international guideline
recommends the culture-guided approach or an alternative therapy
based on local antimicrobial resistances [59]. The most commonly
used antibiotic are rifabutin and furazolidone. Furazolidone is also
used in third line therapy, when study was conducted with 10
patients who failed in first-line, second-line and rifabutin-based
therapy showed 60% eradication used along with amoxicillin and
PPI [60]. A study among 94 consecutive population showed>90%
treatment efficacy when they prescribed regimen after carrying out
susceptibility test [61]. Currently this approach is carried out in
specialist centres with research interest and expertise in treatment.
Adjuvant therapy
Adjuvant therapies may show added benefits in eradication of H. pylori
infections. One of the studies conducted in 2008, using probiotics
along with H. pylori eradication therapy showed no side effects and
increased the rate of eradication [62]. Vaccination has been proposed
for eradication of H. pylori infection which is still in phase I trial with
relatively good success [63]. So to overcome the problem of antibiotic
resistance of H. pylori new therapeutical strategies should be
developed [8].
Ashwini et al.
Int J Pharm Pharm Sci, Vol 7, Suppl 1, 14-20
“Drugs from Nature: Plants as an important source of pharmaceutically important metabolites”
Guest Editor: Dr. Dhananjaya Bhadrapura Lakkappa
18
Herbal drugs for the management of H. Pylori
Many infections can be treated by non-antibiotics. These non-
antibiotic therapies for treating H. pylori infections includes herbal
extracts, probiotics, phytomedicines, antioxidants, flavonoids,
essential oils, terpenoids so-on [64]. Many medicinal plant products,
including apple peel polyphenol, tea product, garlic extract, finger
root extract possess anti-H. pylori activity and management of
induced gastric inflammatory effect [65]. The entire mechanism is
been depicted in fig. 2.
Natural antioxidants are of immense nutraceutical value. The
medicinal properties of many herbal plants are because of presence
of natural antioxidants. Polyphenols and flavonoids which are
present in plants decreases acid mucosal secretion, inhibits the
production of pepsinogen, promotes gastric mucosa formation and
decrease ulcerogenic lesions [66]. Some of the herbal plants, berries,
fruits which are widely used against H. pylori induced gastric ulcers
are listed below.
Fruits
Apple (Malus domestica)
M. domestica fruit and its extracted phenolic acids possess
gastroprotective activity by reducing neutrophil infiltration in
gastric tissue and antioxidant activity by reducing gastroendothelial
cell injury. Apple peel and fruit which contains polyphenols shows
gastroprotective activity and also inhibit production of inflammatory
cytokines and lipid peroxidation [67].
Cranberry (Vaccinium macrocarpon)
As per Anna et al., cranberry juice at 20% concentration fortified
with sodium hydrocarbonate or calcium have shown promising
results in the elimination of H. pylori [64].
Gooseberry (Phyllathus emblica)
Phenolic present in the fruit of P. emblica possesses antioxidant
activity and cryoprotective activity through which it protects against
gastric ulcer. Gallic acid rich extract have been reported with
excellent healing property on gastric ulcer. Fruit ethanol extract
have shown anti H. pylori activity in in vitro conditions [68].
Pomogranate (Puccinia granatum)
The peel extract of P. granatum has antioxidant activity which
protects gastric mucosa & gastric ulcer. The tannins from fruit of P.
granatum are known to prevent the formation of gastric ulcer [69].
Raspberries (Rubus idaeus)
Ellagic acid, the main constituent of raspberries is a powerful
disease fighting substance and it was demonstrated that it could kill
several H. pylori strains. Ellagic acid is very stable substance which
does not degrade while storage or cooking [68].
Red wine
Red wine possesses antibacterial activity against H. pylori because of the
presence of resveratrol. Resveratrol has shown a remarkable inhibitory
effect on H. pylori urease activity with MIC range of 6.25-25ug/ml [69].
Plants
Berberines
An active constituent of Berberis vulgaris is an alkaloid isolated from
root and bark, has been effective in preventing H. pylori infection [66]
Cinnamon
It is demonstrated that extracts of cinnamon helps in fighting against
H. pylori by inhibiting bacterial urease enzyme inside stomach [70].
Curcumin
Curcumin, an active constituent of Curcuma longa (turmeric) has a
great therapeutic potential against H. pylori associated
gastroduodenal diseases and also was very effective in eradicating H.
pylori from infected mouse stomach [71].
Garlic (Allium sativum)
Garlic contains thiosulfonates, terpenoids, steroids and other phenols
which may be responsible for its medicinal value. It is reported that H.
pylori is susceptible to 40 ug/ml of garlic extract [72].
Green tea
Green tea one of the popular beverages worldwide has shown its
antibiotic activity against H. pylori in vitro and in vivo. Antioxidant
catechin present in green tea has shown excellent antibacterial
activity against H. pylori. Epigallocatechin gallate showed strongest
activity with MIC = 8 ug/ml for 50% of the tested strain. Effect of
green tea is dose dependent [73].
Ginger (Zingiber officinale)
Gingerols are group of structurally related polyphenolic compounds
isolated from ginger are found to be active constituent and inhibits
the growth of CagA+ strains. MIC range of 0.78 to 12.5ug/ml was
significantly active against CagA+ strains of H. pylori [74].
Liquorice (Glycyrrhiza glabra)
Liquorice has been used in traditional ways in many countries for
the management of H. pylori. The rhizomes and roots of G. glabra
contain antimicrobial, antioxidant, antiadhesive, anticancer and anti-
ulcer activities. Gutgard is an extract from G. glabra. This could
reduce H. pylori gastric colonization significantly [69].
Nutmeg (Myristica fragrans)
Through various investigations it has been proved that M. fragrans
seeds have very strong anti H. pylori activity in vitro.
Dihydroguaiaretic acid which is isolated from aril of seed also
showed a strong anti H. pylori activity. The major action of these
seeds is suppression of acidity and volume of gastric secretion. An
herbal formulation containing M. fragrans have remarkably
inhibited gastric ulcer and hypersecretion in rats [75].
Honey
Manuka honey has shown bacteriostatic properties on H. pylori at a
50 mL/l concentration. According to Osato et al., osmotic effect was
shown to be the important reason for killing H. pylori [76].
Propolis
A mixture which is collected by honey bees from different plant
sources to maintain the structural stability of the hive. Propolis is
considered as natural antibiotic because of its high content of
phenolic compounds. According to one of the reports 30% ethanolic
extracts of propolis have inhibited the growth of several H. pylori
clinical isolates in vitro through agar dilution, disc diffusion, agar-
well diffusion methods [76].
Essential oil
Thyme oil and Eucalyptus oil
A study carried out by Esmaeili et al. for determining anti-H. pylori
activity using essential oils of T. valgaris and E. globulus with H. pylori
ATCC 700392, T. valgaris showed better inhibitory activity [77].
Mastic gum
Mastic gum derived from Pistacia lentiscus tree, has anticancer,
antimicrobial activity [78] α-terpineol and (E)-methyl isoeugenol are
the components present in Mastic gum contribute to anti-H. pylori
activity as per the research conducted by Miyamoto et al.[79].
Carrot seed oil
(Daucus carota) researchers have proved among 16 different
essential oil considered for anti-H. pyloriactivity, carrot seed oil
exhibited better result followed by cinnamon bark oil [78, 79].
CONCLUSION
Gastric ulcer and cancers are the most prevalent gastrointestinal
disorder, resulting from oxidative stress, Helicobacter pylori
infection, up-regulation of proton potassium ATPase (PPA) activity,
Ashwini et al.
Int J Pharm Pharm Sci, Vol 7, Suppl 1, 14-20
“Drugs from Nature: Plants as an important source of pharmaceutically important metabolites”
Guest Editor: Dr. Dhananjaya Bhadrapura Lakkappa
19
down-regulation of gastric mucosal defense, etc. Further, the biotic
and abiotic environment influences the efficacy with which H. pylori
colonizes surfaces. The presence of microorganisms such as S.
epidermidis and other general intestinal microflora can facilitate the
colonization and persistency of H. pylori in the environment. The
mechanism involved in these interactions remains unknown but we
speculate that they are complex and it will be interesting to
characterize the molecules involved in this interaction (80, 81).
Currently, there is no human vaccine available against this pathogen.
Acquisition of resistance to antibiotics would represent a major
therapeutic problem. Thus it is very important to test for antibiotic
resistance in food-borne and clinical isolates of H. pylori and to
reconsider critically the use of antibiotics. A better understanding of
these processes will have a significant impact on the research
concerning the spread of infectious microorganisms in general and
on food safety. With respect to above facts, the authors emphasize
the role of phytochemicals as they offer better contribution to
antiulcer/anti-H. pylori activity. Thus, suggesting the possible usage
of bioactive which may find better application in ulcer management
and ulcer therapy. The current review embarks, H. pylori as an
organism which is much intelligent to be understood.
ACKNOWLEDGEMENT
Authors sincerely thank Dean, Director of Research and HOD,
Faculty of Life Sciences, JSS University, Mysore, The Principal, SJCE,
Mysore for their encouragement. All authors thank the Principal,
Mahajana Research Foundation for their support and
encouragement throughout the execution of this work. We also like
to thank JSS Medical College and JSS Hospital for their support.
CONFLICT OF INTERESTS
All authors declare no conflict of interest
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