|Year : 2015 | Volume
| Issue : 2 | Page : 421-428
Protective effects of ginger and marshmallow extracts on indomethacin-induced peptic ulcer in rats
Sameh S Zaghlool1, Basim A Shehata2, Ali A Abo-Seif1, Hekma A Abd El-Latif3
1 Department of Pharmacology and Toxicology, Faculty of Pharmacy, Nahda University, Beni-Suef, Egypt
2 Department Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
3 Department of Pharmacology and Toxicology, Faculty of Pharmacy, Umm Al-Qura University, KSA
|Date of Web Publication||6-Jul-2015|
Dr. Sameh S Zaghlool
Faculty of Pharmacy, Nahda University, Beni-Suef
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: Gastric ulcer is one of the most serious diseases. Most classic treatment lines produce adverse drug reactions. Therefore, this study aimed to investigate the protective effects of two natural extracts, namely ginger and marshmallow extracts, on indomethacin-induced gastric ulcer in rats. Materials and Methods: Animals were divided into five groups; a normal control group, an ulcer control group, and three treatment groups receiving famotidine (20 mg/kg), ginger (100 mg/kg), and marshmallow (100 mg/kg). Treatments were given orally on a daily basis for 14 days prior to a single intra-peritoneal administration of indomethacin (20 mg/kg). Results: Indomethacin administration resulted in significant ulcerogenic effect evidenced by significant elevations in ulcer number, ulcer index, and blood superoxide dismutase activity accompanied by significant decreases in gastric mucosal nitric oxide and glutathione levels. In addition, elevations in gastric mucosal lipid peroxides and histamine content were observed. Alternatively, pretreatment with famotidine, ginger or marshmallow significantly corrected macroscopic and biochemical findings, supported microscopically by results of histopathological study. Conclusion: These results demonstrate that administration of either ginger or marshmallow extract could protect against indomethacin-induced peptic ulcer in rats presumably via their antioxidant properties and inhibition of histamine release.
Keywords: Famotidine, ginger, indomethacin, marshmallow, peptic ulcer
|How to cite this article:|
Zaghlool SS, Shehata BA, Abo-Seif AA, Abd El-Latif HA. Protective effects of ginger and marshmallow extracts on indomethacin-induced peptic ulcer in rats. J Nat Sc Biol Med 2015;6:421-8
|How to cite this URL:|
Zaghlool SS, Shehata BA, Abo-Seif AA, Abd El-Latif HA. Protective effects of ginger and marshmallow extracts on indomethacin-induced peptic ulcer in rats. J Nat Sc Biol Med [serial online] 2015 [cited 2021 Mar 7];6:421-8. Available from: http://www.jnsbm.org/text.asp?2015/6/2/421/160026
| Introduction|| |
Peptic ulcer is one of the world's major gastrointestinal disorders, embracing both gastric and duodenal ulcers, and affecting 10% of the world population.  Peptic ulcer disease is a complex and multicausal disease that occurs when biological balance between defense and aggressive factors in gastrointestinal tract is disturbed.  Among aggressive factors are endogenous factors like gastric acid and pepsin secretion,  active free radicals and oxidants, leukotrienes,  and endothelins  as well as exogenous factors like ethanol  or nonsteroidal anti-inflammatory drugs (NSAIDs).  In contrast, gastric mucus, bicarbonate,  normal blood flow,  prostaglandins (PGs), nitric oxide (NO), and antioxidant enzymes like catalase (CAT), or antioxidant peptides like glutathione (GSH) work as defensive barriers. 
There are many drugs that are used in the treatment of peptic ulcer. Until now, there is no one drug without a side effect or that gives 100% curative rate or complete cure. 
Famotidine is an H 2 receptor antagonist that inhibits acid production by reversibly competing with histamine for binding with histamine H 2 receptors that are located at the basolateral membrane of the parietal cells.  Histamine H 2 receptor antagonists not only inhibit acid secretion induced by histamine, gastrin and cholinergic stimulation, but also promote healing of the ulcers. 
Various medicinal plants were used traditionally in the treatment of peptic ulcer. Plants and phytomedicines exhibit their action by various mechanisms like antioxidant, cytoprotective or antisecretory actions.  Plants possessing active principles such as flavonoid, tannins, or terpenoids usually show antiulcer activity. 
Ginger (Zingiber officinale Roscoe, Family: Zingiberaceae) is a herbal drug. Some active components of ginger are reported also to stimulate digestion and absorption and to relieve constipation and flatulence by increasing muscular activity in the digestive tract. ,
In folk medicine and literature, marshmallow (Althaea officinalis L., Family: Malvaceae) was used in gastrointestinal disorders.  Aqueous marshmallow flower extract demonstrated protection against ethanol-induced gastric ulcer in some nations. It has been shown that mucilage and flavonoids have the property of covering and protecting gastric mucosa, thereby reducing the incidence of gastric ulcer. 
Based on the abovementioned data, the aim of the present study was to investigate the putative protective values and mechanisms of ginger and marshmallow extracts in indomethacin-induced peptic ulcer in rats.
| Materials and Methods|| |
Adult male Wistar rats, weighing 200-250 g, were used as experimental animals in the present investigation. Animals were obtained from the animal house of Nahda University, Beni-Suef. They were kept under observation for about 15 days before the onset of the experiment to exclude any inter-current infection. The chosen animals were housed in plastic cages with good aerated covers at 25°C ± 0.5°C as well as 12 h light/dark cycles. Animals were allowed free access to water and were supplied daily with standard forage ad libitum. All animal housing and handling were conducted in accordance with the research protocols established by the Animal Care Committee of the National Research Center (Cairo, Egypt) which followed the recommendations of the National Institutes of Health Guide for Care and Use of Laboratory Animals (Publication No. 85-23, revised 1985).
Ginger and marshmallow were purchased from Haraz Company, Cairo, Egypt and were identified phytochemically by staff members of the Department of Pharmacognosy, Faculty of Pharmacy, Nahda University. Alcoholic extract of ginger was prepared by cutting rhizomes into small pieces that were completely dried in shed up for 3-4 days. Powder (1 kg) was obtained with the help of a mixer, and then extraction was done using 50% ethanol (v/v). The homogenate was concentrated on rotavapor (IKA ® RV 10, digital, 20-270 rpm - IKA ® HB 10, basic, 0-180°C - made in Germany). The residue was designated as ethanol extract (11.5 g). The extract was presolubilized in distilled water for the in vivo studies.  The residue was dissolved in normal saline, 100 mg/mL, and prepared for oral use. Aqueous extract of marshmallow was prepared by soaking the dried flowers of marshmallow (1 kg) in hot water (85-90°C) for h, followed by filtration and drying of the filtrate under reduced pressure, with a final yield of about 11.8%. The residue was dissolved in normal saline in a concentration of 100 mg/mL, and kept for oral administration. 
Drugs, chemicals, and reagent kits
All chemicals used in the study were of analytical grade. Famotidine was obtained as a gift from Amoun Pharmaceutical Industries Company "APIC," Cairo, Egypt. Indomethacin was obtained as a gift from Sigma Pharmaceutical Company, Egypt. Histamine reagent kit was obtained from Oxford Biomedical Research, Inc., USA. Malondialdehyde (MDA) reagent kit was obtained from Cell Biolabs, Inc., USA. NO reagent kit was obtained from Assay Designs, Inc., USA. GSH reagent kit was obtained from Cell Biolabs, Inc., USA. Superoxide dismutase (SOD) reagent kit was obtained from Cell Biolabs, Inc., USA.
Preliminary phytochemical study
The extracts were subjected to preliminary phytochemical screening. , Results of screening are shown in the following table:
Rats were randomly allocated into five groups, each consisting of 6-8 rats, where test agents or saline were administrated by oral feeding tube once daily for consecutive 14 days. Groups 1 and 2 received normal saline (10 ml/kg/day, p.o.) and served as normal control and peptic ulcer control groups, respectively. Group 3 received famotidine (20 mg/kg/day, p.o.)  and served as standard treatment group. Group 4 received ginger (100 mg/kg/day, p.o.), , while Group 5 received marshmallow (100 mg/kg/day, p.o.),  and served as study treatment groups. On 15 th day, all animals were subjected to a single intra-peritoneal administration of indomethacin (20 mg/kg, i.p.),  except for the normal control group, after 24 h of starvation. Three hours after injection of indomethacin or saline, animals were sacrificed by cervical dislocation under anesthesia by urethane (1.25 g/kg, i.p.). The blood samples were collected from the retino-orbital sinus before rats were sacrificed. Stomachs were isolated and opened along the greater curvature. The stomachs were washed with ice-cold saline and the glandular portion was then exposed and examined for ulceration. Ulcer index was determined and following gastric ulcer assessment, gastric mucosal homogenates were prepared in saline for biochemical estimations.
Assessment of gross mucosal damage
The gastric mucosal layer was carefully inspected for the occurrence of ulcers and their numbers were counted with the aid of an illuminated magnifying lens (10x).  The sum of the total length of long ulcers and hemorrhagic spots in each group of rats was divided by the number of animals to calculate the ulcer index (mm). Ulcer index was calculated according to the method described by.  The preventive index was calculated according to the method previously described. 
Histamine content of the gastric mucosa was determined according to the method described earlier  using enzyme immunoassay at 650 nm spectrophotometrically. Gastric mucosal GSH was determined in stomach homogenate using a chromogen that reacts with the thiol group of GSH to produce a colored compound that absorbs at 405 nm spectrophotometrically.  Lipid peroxide formation was determined in gastric mucosal homogenate according to the method described previously  at 532 nm spectrophotometrically. Total NO concentration was determined in gastric mucosal homogenate according to the method previously described  at 540 ± 20 nm spectrophotometrically. SOD activity was determined in blood according to the method described previously  at 490 nm spectrophotometrically.
Hematoxylin and eosin (H and E) was used for histological examination of the general structure of the stomach.  The effect of drugs was evaluated through assessment of the inflammatory and necrotic changes in the mucosal tissue. Briefly, gastric tissue samples from each group were fixed in 10% formalin for 24 h. The formalin fixed specimens were embedded in paraffin and sectioned (3-5 mm) and stained with H and E dye. The histochemical sections were evaluated by light microscope and photographed.
Statistical analysis and the significance of the difference between group means were determined using one-way ANOVA test followed by Tukey-Kramer multiple comparisons test, using GraphPad Instat computer software, San Diego, USA. Graphs and tables were performed using Microsoft Excel 2010 computer program (Microsoft Office Privacy, Microsoft Corporation, One Microsoft Way, Redmond, WA, USA).
| Results|| |
Ulcer number, ulcer index, and preventive index [Figure 1]
|Figure 1: Protective effects of 14 days daily treatment by ginger, marshmallow and famotidine on ulcer number, ulcer index, and preventive index in indomethacin-induced gastric ulceration in rats. Each value represents the mean of 6-8 animals ± standard error of the mean. Statistical analysis was determined using one-way ANOVA test followed by Tukey-Kramer multiple comparisons test. *Significantly different from normal control group value at P < 0.05. @ Significantly different from the ulcer control group value at P < 0.05. # Significantly different from famotidine (standard drug) treated group value at P < 0.05|
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Rats subjected to indomethacin administration showed significant ulceration in the glandular area of their stomachs compared to normal control rats. Pretreatment with famotidine and ginger significantly reduced ulcer number and ulcer index and significantly prevented the incidence of ulceration as compared to ulcer control group. In addition, marshmallow pretreatment did not significantly affect the ulcer number or ulcer index but significantly prevented the incidence of ulceration as compared to ulcer control group and significantly increased the ulcer number and ulcer index as compared to famotidine (standard drug) treated group.
Blood superoxide dismutase activity [Figure 2]
|Figure 2: Protective effects of 14 days daily treatment by ginger, marshmallow and famotidine on superoxide dismutase in indomethacin- induced gastric ulceration in rats. Each value represents the mean of 6-8 animals ± standard error of the mean. Statistical analysis was determined using one-way ANOVA test followed by Tukey-Kramer multiple comparisons test. *Significantly different from normal control group value at P < 0.05. @ Significantly different from the ulcer control group value at P < 0.05. # Significantly different from famotidine (standard drug) treated group value at P < 0.05.|
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Rats subjected to indomethacin administration (ulcer control rats) showed a significant increase in SOD activity as compared to normal control rats. Pretreatment with famotidine and ginger significantly decreased SOD activity as compared to ulcer control rats. In addition, marshmallow pretreatment significantly increased SOD activity as compared to ulcer control rats, being significantly better than famotidine (standard drug) treated group.
Tissue nitric oxide, glutathione, malondialdehyde, and histamine [Table 1]
|Table 1: Protective effects of 14 days daily treatment by ginger, marshmallow, and famotidine on NO, GSH, MDA and histamine in indomethacin-induced gastric ulceration in rats|
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Rats subjected to indomethacin administration (ulcer control rats) showed significantly decreased GSH and NO content and significantly increased MDA and histamine contents as compared to normal control rats. Pretreatment with famotidine significantly increased GSH and NO contents and significantly decreased MDA and histamine contents as compared to ulcer control rats. Ginger pretreatment significantly increased NO content as compared to ulcer control group. On the other hand, it did not significantly affect GSH content as compared to ulcer control group. Ginger pretreatment significantly decreased MDA and histamine content as compared to ulcer control rats. In addition, marshmallow pretreatment did not significantly affect GSH or NO contents as compared to ulcer control rats. Marshmallow also did not significantly affect MDA content but significantly increased histamine content as compared to ulcer control rats.
Histopathological examination [Figure 3]a-e
|Figures 3: Images from stomachs and histopathological examination of each group. (a) Image from stomach and a photomicrograph of the fundus of Group 1 normal control group. (b) Image from stomach and a photomicrograph of the fundus of Group 2-ulcer control group. (c) Image from stomach and a photomicrograph of the fundus of Group 3-famotidine (20 mg/kg, p.o.). (d) Image from stomach and a photomicrograph of the fundus of Group 4-ginger (100 mg/kg, p.o.). (e) Image from stomach and a photomicrograph of the fundus of Group 5-Marshmallow (100 mg/kg, p.o.). Where (white arrow) is gastric pits or congested blood vessels, (black arrow) is the glandular mucosa, (arrow heads) is cellular infiltration, (ê) is the submucosal layer, MM is the muscularis mucosa, IC is the inner circular layer of musculosa and OL is outer longitudinal layer|
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Histopathological examination of normal control rats' stomachs showed normal basic layers of the fundus. The glandular mucosa appears darker because of nuclei of epithelial and connective tissue. It contains thin pink strip marks in the muscularis mucosa [Figure 3]a. Rats subjected to indomethacin showed severe disruption in the glandular epithelium with exfoliation of cells. Edema of submucosa, cellular infiltration, and congested blood vessels were also evident [Figure 3]b. Pretreatment with famotidine limited the damage to the superficial epithelium with detachment of few cells [Figure 3]c. Ginger-pretreated rat sections showed mild disruption to the glandular epithelium, with some edema of the submucosal layer and intact muscularis mucosa [Figure 3]d. Marshmallow pretreatment showed disruption to the glandular epithelium with exfoliation of cells, associated with edema of the submucosal layer, thickened muscularis mucosa, congested blood vessels, and cellular infiltration [Figure 3]e.
| Discussion|| |
The present investigation aims to evaluate the possible protective effects of ginger and marshmallow on indomethacin-induced gastric ulcer in rats. Results of the current investigation revealed that indomethacin administration caused significant ulceration in the glandular area of the rat stomach as seen in histopathological examination, associated with marked elevation in ulcer number and ulcer index. These results are in agreement with previous investigations demonstrating that anti-inflammatory drug like indomethacin can produce visible gastric ulcers in experimental animals. ,, In the present investigation, indomethacin administration significantly decreased gastric GSH content compared to normal rats, again in harmony with previous studies demonstrating that indomethacin administration produced significant reduction in GSH contents in gastric mucosa.  The decreased concentration of GSH is typically associated with increased lipid peroxidation, evident in the present study as increased MDA level. In agreement, antioxidant markers have been shown to be reduced in stomach tissue damaged by indomethacin in a previous study.  NSAID administration was reported to cause suppression of antioxidant defense and to initiate lipid peroxidation in stomach tissue, resulting in gastric damage.  According to our results, indomethacin administration significantly decreased NO content. Similarly, NO levels were shown to be reduced in stomach tissue damaged by indomethacin.  In addition, it was demonstrated that indomethacin application significantly decreased levels of endogenous antioxidants GSH and NO. ,, A well-known mechanism responsible for gastric damage induced by indomethacin is the inhibition of cycloxygenase, a rate limiting enzyme in the synthesis of PGs. However, recent studies have suggested that NSAIDs such as indomethacin have pro-oxidant activity and initiate lipid peroxidation by generating reactive oxygen species, thereby interfering with endogenous antioxidant systems of the mucosa cells. ,,
Increased oxidative stress is an important cause of NSAIDs' damaging effect on stomach tissue. , Our results showed that indomethacin administration significantly increased gastric tissue histamine content. These results are in harmony with previous investigations concluding that PGs are extremely potent inhibitors of mast cell degranulation, and mast cells are capable of releasing a variety of mediators, like leukotriene C 4 and platelet activating factor, that can contribute to mucosal injury. In addition, NSAIDs could reduce gastric mucosal blood flow and thus contribute to the pathogenesis of ulcer disease.  According to our work results, indomethacin administration significantly increased gastric SOD activity, which was in agreement with previous reports.  The relationship between SOD activity and PG synthesis is suggested as a possible mechanism of indomethacin-induced ulcers. ,
On the other hand, mechanisms for such actions of NSAIDs seem to be complex and multifactorial, including the inhibition of PG synthesis, induction of apoptosis and necrosis of gastric mucosal cells, , neutrophil penetration, dysfunction of microvessels, reduced secretion of bicarbonate and mucus, and increased gastric motility.  However, the actual mechanisms by which NSAIDs produce acute and chronic gastro-duodenal mucosal injury are not completely understood.  However, recent studies have focused on the role of oxidative stress in mediating NSAID-induced microvascular disturbance associated with gastric mucosal injury.  Indomethacin produced more severe gastric damage in rats than did other non-NSAIDs. 
Results of the present study revealed that famotidine protected animals from indomethacin-induced gastric ulceration as manifested by significantly reduced ulcer number and ulcer index. Similar results were obtained by previous authors  showing high antiulcer activity of famotidine on indomethacin-induced ulcers. Oral administration of H 2 antagonists significantly reduced ulcer index after indomethacin administration. 
Famotidine significantly increased GSH content compared to ulcer control rats. Previous investigations reported that famotidine administration significantly increased GSH content in indomethacin-treated animals.  In addition, famotidine significantly increased gastric GSH and NO contents after indomethacin administration, in harmony with previous investigations. , In the present study, famotidine significantly decreased MDA content after indomethacin administration. This significant reduction in MDA levels along with significant increase in CAT level suggested antioxidant activity of H 2 antagonists. 
According to our study, ginger extract significantly reduced the ulcer number and ulcer index after indomethacin administration. Earlier, ethanolic extract of ginger produced a significant decrease in the intensity of ulceration induced by indomethacin and aspirin.  Data of the current work also demonstrated that ginger extract did not change gastric GSH content, again in agreement with previous studies.  Ginger administration significantly increased NO content after indomethacin administration. Similar results have been reported demonstrating that ginger was shown to be a potent inhibitor of NO synthesis in activated macrophages.  Ginger extract administration also decreased MDA after indomethacin administration. These results are in harmony with that obtained reporting an increase in MDA level could be prevented by orally treating the ulcer-induced animals with ginger extract as ginger extract caused a reduction in MDA concentration in the ulcerated gastric mucosa.  Data of the current work demonstrated that ginger extract significantly decreased histamine content. Similar results were obtained demonstrating that both ginger extract as well as 6-gingerol could inhibit production of pro-inflammatory cytokines from macrophages.  In addition, ginger extract significantly decreased SOD activity after indomethacin administration. Pretreatment with ginger for 2 weeks reversed these oxidative changes with concomitant decrease in SOD level, thereby suppressing most of the biochemical adverse effects induced by indomethacin. It has been reported that ginger had antioxidant activity and could improve enzymatic antioxidant activity.
The key of using ginger as a potential anti-ulcer agent originated from the finding that two of its active constituents, 6-gingerol and the terpenoid zingiberene, can ameliorate gastric lesion formation.  Surprisingly, some constituents of ginger have been shown to inhibit the synthesis of PGs.  It is therefore not understood how crude extracts of ginger can antagonize the effect of NSAIDs compounds. 
Results of the present study revealed that marshmallow extract did not change the ulcer number and ulcer index, and did not significantly affect GSH, NO or MDA contents after indomethacin administration. However, marshmallow extract significantly increased histamine content after indomethacin administration. Similar results have been reported demonstrating that marshmallow has immunostimulant activity where aqueous extracts of the roots stimulated phagocytosis and release of oxygen radicals and leukotrienes from human neutrophils in vitro. The aqueous extract also induced the release of cytokines, interleukin-6, and tumor necrosis factor from human monocytes in vitro. In addition, marshmallow extract significantly increased SOD activity after indomethacin administration. Marshmallow was reported to promote antioxidant activity, in a neotetrazolium model of injury. 
Therefore, the anti-ulcer effect of marshmallow could be attributed to the reduction of oxidative stress and histamine release. The gastroprotective effect of marshmallow observed could be attributed to active compounds found in the extract such as flavonoids and mucilage polysaccharides. ,
| Conclusion|| |
The present study demonstrates that administration of either ginger or marshmallow extract could protect against indomethacin-induced peptic ulcer in rats, presumably via their antioxidant properties and inhibition of histamine release.
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