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  • Title: Enhancement of the antibiotic activity against a multiresistant Escherichia coli by Mentha arvensis L. and chlorpromazine.
    Author: Coutinho HD, Costa JG, Lima EO, Falcão-Silva VS, Siqueira-Júnior JP.
    Journal: Chemotherapy; 2008; 54(4):328-30. PubMed ID: 18698137.
    Abstract:
    BACKGROUND: This is the first report testing the antibiotic resistance-modifying activity of Mentha arvensis. METHODS: In this study an ethanol extract of M. arvensis L. and chlorpromazine were tested for their antimicrobial activity alone or in combination with conventional antibiotics against strains of Escherichia coli. RESULTS: The growth of two E. coli strains tested was not inhibited by the extract. The minimum inhibitory concentration and minimal bactericide concentration values were >or=1 mg/ml for both strains of E. coli used. A potentiating effect of this extract on gentamicin was demonstrated. Similarly, there was a potentiating effect of chlorpromazine on kanamycin, amikacin and tobramycin, indicating the involvement of an efflux system in the resistance to these aminoglycosides. CONCLUSIONS: It is therefore suggested that extracts from M. arvensis could be used as a source of plant-derived natural products with resistance-modifying activity, such as in the case of gentamicin, constituting a new weapon against bacterial resistance to antibiotics, as with chlorpromazine.
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