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Bactericidal effect of plaunotol, a cytoprotective antiulcer agent, against Helicobacter pylori
Abstract:
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.
Insights
Plaunotol effectively kills Helicobacter pylori by interacting with its cell membrane, while its derivatives
Area of Science:
- Microbiology
- Pharmacology
- Biochemistry
Background:
- Helicobacter pylori is a significant pathogen causing gastric ulcers.
- Plaunotol is an antiulcer agent with potential bactericidal properties.
- Understanding the mechanism of action against H. pylori is crucial for developing new treatments.
Purpose of the Study:
- To investigate the bactericidal effect of plaunotol and its derivatives against Helicobacter pylori.
- To determine the relationship between hydrophobicity and bactericidal activity.
- To elucidate the interaction mechanism with the bacterial cell membrane.
Main Methods:
- Comparative study of plaunotol and its derivatives (M-4, M-5, M-6) based on log P determination.
- In vitro assessment of bactericidal activity and cell viability.
- Liposomal membrane interaction studies using phosphatidylethanolamine and cardiolipin.
- Measurement of glucose release from liposomes and leakage of 260 nm absorbing material from H. pylori.
Main Results:
- Plaunotol demonstrated potent bactericidal activity against H. pylori, causing cell lysis.
- Bactericidal activity correlated positively with hydrophobicity; M-4 showed no activity.
- Plaunotol interacted with liposomal membranes and increased bacterial membrane permeability, leading to material leakage.
Conclusions:
- The bactericidal effect of plaunotol against H. pylori is mediated by its interaction with the bacterial cell membrane.
- Hydrophobicity plays a key role in the efficacy of plaunotol and its derivatives.
- Plaunotol's mechanism involves disrupting membrane integrity, suggesting its therapeutic potential.