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Antimicrobial Agents and Chemotherapy, May 1997, 1004-1009, Vol 41, No. 5
L Collins and SG Franzblau
In response to the need for rapid, inexpensive, high-throughput assays for
antimycobacterial drug screening, a microplate-based assay which uses
Alamar blue reagent for determination of growth was evaluated. MICs of 30
antimicrobial agents against Mycobacterium tuberculosis H37Rv, M.
tuberculosis H37Ra, and Mycobacterium avium were determined in the
microplate Alamar blue assay (MABA) with both visual and fluorometric
readings and compared to MICs determined in the BACTEC 460 system. For all
three mycobacterial strains, there was < or = 1 dilution difference
between MABA and BACTEC median MICs in four replicate experiments for 25 to
27 of the 30 antimicrobics. Significant differences between MABA and BACTEC
MICs were observed with 0, 2, and 5 of 30 antimicrobial agents against
H37Rv, H37Ra, and M. avium, respectively. Overall, MICs determined either
visually or fluorometrically in MABA were highly correlated with those
determined in the BACTEC 460 system, and visual MABA and fluorometric MABA
MICs were highly correlated. MICs of rifampin, rifabutin, minocycline, and
clarithromycin were consistently lower for H37Ra compared to H37Rv in all
assays but were similar for most other drugs. M. tuberculosis H37Ra may be
a suitable surrogate for the more virulent H37Rv strain in primary
screening of compounds for antituberculosis activity. MABA is sensitive,
rapid, inexpensive, and nonradiometric and offers the potential for
screening, with or without analytical instrumentation, large numbers of
antimicrobial compounds against slow-growing mycobacteria.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Microplate alamar blue assay versus BACTEC 460 system for high- throughput screening of compounds against Mycobacterium tuberculosis and Mycobacterium avium
Pharmacology Research Department, Gillis W. Long Hansen's Disease Center, Baton Rouge, Louisiana 70894, USA.
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