Sharma, S. and Kumar, M. and Sharma, S. and Nargotra, A. and Koul, S. and Khan, I. A. (2010) Piperine as an inhibitor of Rv1258c, a putative multidrug efflux pump of Mycobacterium tuberculosis. Journal of Antimicrobial Chemotherapy, 65 (8). pp. 1694-1701. ISSN 0305-7453

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Objectives: To evaluate the role of piperine as an inhibitor of Rv1258c of Mycobacterium tuberculosis. Methods: Rifampicin, in combination with piperine, was tested against M. tuberculosis H37Rv and rifampicinresistant (rifr) M. tuberculosis. A laboratory-generated rifampicin-resistant mutant (rifr) of M. tuberculosis was tested for drug susceptibility and the expression level of the putative efflux protein (Rv1258c) by real-time PCR. The three-dimensional (3D) structure of Rv1258c was also predicted using an in silico approach. Results: In the present study, rifampicin in combination with piperine, a trans-trans isomer of 1-piperoyl-piperidine,reduced the MIC and mutation prevention concentration (MPC) of rifampicin for M. tuberculosis H37Rv, including multidrug-resistant (MDR) M. tuberculosis and clinical isolates. Moreover, piperine effectively enhanced the bactericidal activity of rifampicin in time–kill studies and also significantly extended its post-antibiotic effect (PAE). In the presence of rifampicin, M.tuberculosis rifr showed a 3.6-fold overexpression of Rv1258c.The 3D structure of Rv1258c, using in silico modelling, was analysed to elucidate the binding of piperine to the active site. Conclusions: The results of this study are suggestive of piperine’s involvement in the inhibition of clinically overexpressed mycobacterial putative efflux protein (Rv1258c). Piperine may be useful in augmenting the antimycobacterial activity of rifampicin in a clinical setting.

Item Type: Article
Subjects: Pharmacological Sciences
Depositing User: Mr. Amit Nargotra
Date Deposited: 02 Jan 2012 11:13
Last Modified: 02 Jan 2012 11:13

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