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Assessment of the Activity of Selected Indian Medicinal Plants against Mycobacterium tuberculosis: A Preliminary Screening Using the Microplate Alamar Blue Assay

Tannaz Birdi, Desiree D’souza, Monica Tolani, Poonam Daswani, Vinita Nair, Pundarikakshudu Tetali, Juan Carlos Toro, Sven Hoffner

European Journal of Medicinal Plants · pp. 308–323 · Published 12 Oct 2012

10.9734/EJMP/2012/1638

Abstract

Aim: Identification of anti-Mycobacterium tuberculosis agents of plant origin, against sensitive and multidrug resistant (MDR) strains. Study Design: Assessing anti-M. tuberculosis activity of five Indian medicinal plants, which have been reported in traditional literature for various uses including respiratory ailments. Place and Duration of Study: Mumbai, India; May 2009 – December 2011. Methodology of Study: The reference strain (H37Rv), three susceptible and three MDR clinical isolates of M. tuberculosis were used. Acetone, ethanol and aqueous extracts (prepared sequentially) of Acorus calamus L. (rhizome), Andrographis paniculata Nees. (leaf), Ocimum sanctum L. (leaf), Piper nigrum L. (seed) and Pueraria tuberosa DC. (tuber) were tested at 1, 10 and 100 µg/ml using the Microplate Alamar Blue Assay. The active extracts were assessed for cytotoxicity on the human lung epithelial cell line (A549) using the neutral red assay and a phytochemical analysis was made using High Performance Thin Layer Chromatography (HPTLC). Results: Among the plants tested, the acetone extract of P. nigrum appears promising. It was effective against H37Rv, all susceptible isolates and one MDR isolate at 100 µg/ml. The ethanol extract caused some inhibition of growth, though less than the cut-off of 99%. A combination of acetone and ethanol extracts at 50 µg/ml each was effective against all isolates tested. The known active phytoconstituent of P. nigrum, piperine (also an efflux pump inhibitor), was effective against H37Rv in the presence of suboptimal concentration of Rifampicin, but not against the clinical isolates tested. Presence of piperine in the acetone and ethanol extracts was confirmed by HPTLC. Extracts of P. nigrum and piperine were not cytotoxic to the A549 cell line. Conclusion: Amongst the five plants tested, P. nigrum was active. The acetone extract may have active components in addition to piperine. It is possible that the class and expression of efflux pumps in H37Rv is different from that in the clinical isolates, and hence piperine did not inhibit these isolates. Thus, it is necessary to screen clinical isolates in addition to reference strains. The observation of the increased efficacy of the combination of acetone and ethanol extracts is interesting.

Traditional medicine anti-Mycobacterium tuberculosis; microplate alamar blue assay cytotoxicity HPTLC Piper nigrum.

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