Volume 14, Issue 2 pp. 139-140
Short Communication

The effect of reserpine, a modulator of multidrug efflux pumps, on the in vitro activity of tetracycline against clinical isolates of methicillin resistant Staphylococcus aureus (MRSA) possessing the tet(K) determinant

Simon Gibbons

Corresponding Author

Simon Gibbons

Centre for Pharmacognosy and Phytotherapy, The School of Pharmacy, University of London, 29–39 Brunswick Square, London WC1N 1AX, UK

The School of Pharmacy, University of London, 29–39 Brunswick Sqaure, London WC1N 1AXSearch for more papers by this author
E. E. Udo

E. E. Udo

Department of Microbiology, Faculty of Medicine, Kuwait University, P.O. Box 24923, Safat 13110, Kuwait

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Abstract

As part of a screening programme to identify modulators of multidrug efflux in methicillin resistant Staphyloccocus aureus (MRSA), we have validated our assays using the antihypertensive plant alkaloid reserpine. Clinical isolates of MRSA were resistant to tetracycline and shown to possess the tet(K) determinant which encodes for the Tet(K) efflux protein, which conferred high level resistance to tetracycline (MIC = 128 µg/mL). In the presence of reserpine, a known inhibitor of multidrug resistance (mdr) efflux pumps, this MIC was significantly reduced (MIC = 32 µg/mL). Copyright © 2000 John Wiley & Sons, Ltd.

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