Mechanisms of Antibacterial Action of Three Monoterpenes

Antimicrobial Agents and Chemotherapy - Tập 49 Số 6 - Trang 2474-2478 - 2005
Domenico Trombetta1, Francesco Castelli2, Maria Grazia Sarpietro2, Vincenza Venuti1, Mariateresa Cristani1, Cláudia Daniele3, Antonella Saija1, Gabriela Mazzanti3, Giuseppe Bisignano1
1Department Farmaco-Biologico, University of Messina, Messina
2Department of Chemical Sciences, University of Catania, Catania
3Department of Pharmacology of Natural Substances and General Physiology, University of Rome “La Sapienza” Rome, Italy

Tóm tắt

ABSTRACT In the present paper, we report the antimicrobial efficacy of three monoterpenes [linalyl acetate, (+)menthol, and thymol] against the gram-positive bacterium Staphylococcus aureus and the gram-negative bacterium Escherichia coli . For a better understanding of their mechanisms of action, the capability of these three monoterpenes to damage biomembranes was evaluated by monitoring the release, following exposure to the compounds under study, of the water-soluble fluorescent marker carboxyfluorescein from unilamellar vesicles with different lipidic compositions (phosphatidylcholine, phosphatidylcholine/phosphatidylserine [9:1], phosphatidylcholine/stearylamine [9:1], and phosphatidylglycerol/cardiolipin [9:1]). Furthermore, the interaction of the terpenes tested with dimyristoylphosphatidylcholine multilamellar vesicles as model membranes was monitored by means of differential scanning calorimetry. Finally, the results were related to the relative lipophilicity and water solubility of the compounds examined. Taken together, our findings lead us to speculate that the antimicrobial effect of (+)menthol, thymol, and linalyl acetate may result, at least partially, from a perturbation of the lipid fraction of microorganism plasma membrane, resulting in alterations of membrane permeability and in leakage of intracellular materials. Besides being related to physicochemical characteristics of the drugs (such as lipophilicity and water solubility), this effect seems to be dependent on lipid composition and net surface charge of microbial membranes. Furthermore, the drugs might cross the cell membranes, penetrating into the interior of the cell and interacting with intracellular sites critical for antibacterial activity.

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Antimicrobial Agents and Chemotherapy

Tập 49 Số 6

2474-2478

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