Introduction
Among the bacterial chronic infections of the gastrointestinal system,Helicobacter pylori is an important etiological agent of chronic gastritis,peptic ulceration and gastric cancer in humans and possibly a risk factor in coronary heart and cardiovascular diseases The S-shaped gram-negative bacterium,colonizes the gastric epithelial surface, andwithstands the stomach’s hostile ambience by microaerophilic growth capability and high urease activity. In addition, it produces numerous virulence factors, the most important being urease and catalase. Urease is located on the cell surface loosely bound into a urease-containing material and hence continually shed into the microenvironment. With regard to therapies for eradication of the disease produced by this microorganism, colloidal bismuth subcitrate (CBS) (involved in decreased adherence of H. pylori in gastric epithelial cells together with antibiotics, such as amoxycillin, tetracycline, metronidazole,are the drugs currently used against H. pylori. CBS in chewable tablets have been found to be more effective in eradication of this bacterium than ingestible
tablets of the same composition,as a consequence of the fact that H.pylori was also isolated from patients’ dental plaques that were suggested to be a possible source of infection relapse.This triple therapy is considered highly efficient for long-term treatment, with 80% of patients showing absence of pathogens, despite some associated
side effects, such as diarrhea and colitis, and low eradication due to resistance to strain variation, having been reported.In view of the incomplete cure achieved with the
triple therapy described above and its possible side effects, we decided to look for plant extracts capable of inhibiting growth of H. pylori and its highly potent urease activity. In a previous study we reported thyme to be a potent in vitro inhibitor
of the growth and urease production of H. pylori.In the present study, we investigated the inhibitory effect on the growth and urease activity of extracts from stem bark of
Cinnamonum cassia. This spice was found to exertantioxidant activity in fermented meat sausage, to possess antibacterial properties against a large variety of microorganisms,
some of them pathogenic, to inhibit growth and aflatoxin production of molds, to
inhibit food spoilage by yeast and to delay acid production by the starter bacterium Lactobacillus plantarum. In addition, 57 chemical constituents were isolated from its extracts and identified by GLC.Two of them showed prevention of serotonin-induced
ulcerogenesis in rats.Up to now, there have been no studies reporting activities of this plant against H. pylori. Here we report results from the in vitro antibacterial activity
against seven clinical isolates of H. pylori and studies on antiurease activity of ethanolic and methylene chloride extracts of C. cassia and of some of its constituents.
Introduction
Among the bacterial chronic infections of the gastrointestinal system,Helicobacter pylori is an important etiological agent of chronic gastritis,peptic ulceration and gastric cancer in humans and possibly a risk factor in coronary heart and cardiovascular diseases The S-shaped gram-negative bacterium,colonizes the gastric epithelial surface, andwithstands the stomach’s hostile ambience by microaerophilic growth capability and high urease activity. In addition, it produces numerous virulence factors, the most important being urease and catalase. Urease is located on the cell surface loosely bound into a urease-containing material and hence continually shed into the microenvironment. With regard to therapies for eradication of the disease produced by this microorganism, colloidal bismuth subcitrate (CBS) (involved in decreased adherence of H. pylori in gastric epithelial cells together with antibiotics, such as amoxycillin, tetracycline, metronidazole,are the drugs currently used against H. pylori. CBS in chewable tablets have been found to be more effective in eradication of this bacterium than ingestible
tablets of the same composition,as a consequence of the fact that H.pylori was also isolated from patients’ dental plaques that were suggested to be a possible source of infection relapse.This triple therapy is considered highly efficient for long-term treatment, with 80% of patients showing absence of pathogens, despite some associated
side effects, such as diarrhea and colitis, and low eradication due to resistance to strain variation, having been reported.In view of the incomplete cure achieved with the
triple therapy described above and its possible side effects, we decided to look for plant extracts capable of inhibiting growth of H. pylori and its highly potent urease activity. In a previous study we reported thyme to be a potent in vitro inhibitor
of the growth and urease production of H. pylori.In the present study, we investigated the inhibitory effect on the growth and urease activity of extracts from stem bark of
Cinnamonum cassia. This spice was found to exertantioxidant activity in fermented meat sausage, to possess antibacterial properties against a large variety of microorganisms,
some of them pathogenic, to inhibit growth and aflatoxin production of molds, to
inhibit food spoilage by yeast and to delay acid production by the starter bacterium Lactobacillus plantarum. In addition, 57 chemical constituents were isolated from its extracts and identified by GLC.Two of them showed prevention of serotonin-induced
ulcerogenesis in rats.Up to now, there have been no studies reporting activities of this plant against H. pylori. Here we report results from the in vitro antibacterial activity
against seven clinical isolates of H. pylori and studies on antiurease activity of ethanolic and methylene chloride extracts of C. cassia and of some of its constituents.
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