Mittal A, Seshadri PS, Prasad HK, Sathish M, Nath I. Radiometric macrophage culture assay for rapid evaluation of antileprosy activity of rifampin.
Antimicrob Agents Chemother 1983;
24:579-85. [PMID:
6360040 PMCID:
PMC185377 DOI:
10.1128/aac.24.4.579]
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Abstract
The antileprosy effect of rifampin was evaluated by a newly developed rapid in vitro assay wherein 31 human-derived strains and 1 armadillo-derived strain of Mycobacterium leprae were maintained for 2 and 3 weeks, respectively, in murine and human macrophages in the presence of [3H]thymidine. Of these strains, 27 showed significant incorporation of the radiolabel in cultures of live bacilli as compared with control cultures of heat-killed bacilli of the same strain. Consistent and significant inhibition of [3H]thymidine uptake was observed in M. leprae resident cultures with 3 to 200 ng of rifampin per ml as compared with similar cultures without the drug. In general, an increase in percent inhibition was seen from 3 to 20 ng/ml, with marginal increases at 40, 50, and 100 ng/ml. M. leprae strains appear to be remarkably susceptible to this drug in the in vitro assay.
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