Bactericidal effect of plaunotol, a cytoprotective antiulcer agent, against Helicobacter pylori.
نویسندگان
چکیده
In order to investigate the bactericidal effect of plaunotol, an oily antiulcer agent, against Helicobacter pylori, comparative studies were conducted using its derivatives, M-4, M-5, and M-6, whose hydrophobicity decreased in the order of plaunotol > M-6 > M-5 > M-4 by log P determination. Plaunotol rapidly reduced the viability of H. pylori in vitro, and cell death was associated with cell lysis. In addition, plaunotol showed eightfold stronger bactericidal activity against H. pylori than M-6 and M-5, while the compound with the lowest hydrophobicity, M-4, showed no bactericidal activity. The bactericidal activities of plaunotol and its derivatives were related to the hydrophobicity of these compounds. To investigate a possible interaction between these compounds and the cell membrane of H. pylori, their effects on liposomal membranes prepared from phosphatidylethanolamine and cardiolipin, which are known to be present in the membrane of H. pylori, were determined by detection of glucose release from the liposomes. Plaunotol showed eight-fold higher activity than M-6 and M-5, while M-4 showed no activity. The effects of plaunotol and its derivatives on liposomal membrane were therefore related to their bactericidal activities. In addition, it was confirmed that the bactericidal effect of plaunotol against H. pylori was neutralized by the liposomal membrane, and that plaunotol led to an increase in permeability of the membrane, as evidenced by measurement of the leakage of 260 nm absorbing-material from H. pylori. These results suggest that the bactericidal effect of plaunotol against H. pylori is due to the interaction between this compound and the bacterial cell membrane.
منابع مشابه
Effect of plaunotol in combination with clarithromycin against clarithromycin-resistant Helicobacter pylori in vitro and in vivo.
OBJECTIVES Recently, there has been a decrease in the eradication rate of Helicobacter pylori due to the increase in antibiotic resistance of this bacterium. Plaunotol, a cytoprotective anti-ulcer agent, exhibits antibacterial activity against H. pylori. The purpose of the present study was to investigate the effect of plaunotol in combination with clarithromycin against clarithromycin-resistan...
متن کاملEffect of plaunotol in combination with clarithromycin or amoxicillin on Helicobacter pylori in vitro and in vivo.
Plaunotol, a cytoprotective anti-ulcer agent, has antibacterial activity against Helicobacter pylori. The purpose of the present study was to investigate the effect of plaunotol when combined with clarithromycin or amoxicillin against H. pylori. When combined with clarithromycin, plaunotol showed synergic activity against 11 of 14 strains, and additive activity against the other three strains, ...
متن کاملCapsaicin as an inhibitor of the growth of the gastric pathogen Helicobacter pylori.
Capsaicin, the active ingredient in chili, has been implicated as both a cytoprotective and a detrimental agent to the gastric mucosa. The effect of capsaicin on Helicobacter pylori has not been investigated previously. Therefore, we performed in vitro time- and concentration-dependent studies to examine the growth of H. pylori in the presence of capsaicin. Capsaicin specifically inhibited grow...
متن کاملEradication of Helicobacter pylori and use of antisecretory drugs: population based cohort study.
Helicobacter pylori is an important risk factor for peptic ulcers. If infection withH pylori is cured, ulcers associated with H pylori do not recur. An H pylori “test and treat” strategy for patients with peptic ulcers having long term antisecretory treatment has been suggested, in the hope that eradicating H pylori would curtail the rising use of antiulcer drugs. 2 We describe the long term ef...
متن کاملIn vitro bactericidal activities of Japanese rice-fluid against Helicobacter pylori strains
BACKGROUND Helicobacter pylori has now been widely recognized as a causative agent of gastroduodenal diseases. The development of safer anti- H. pylori compounds is desirable due to the antibiotic-resistant strains emerged to date. METHODS We successfully developed the compounds of Rice-fluid derived from unpolished, polished, and usually cooked Japanese rice, and investigated their in vitro ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- The Journal of antimicrobial chemotherapy
دوره 38 3 شماره
صفحات -
تاریخ انتشار 1996