Abstract
MICs of dapsone (p-p'-diaminodiphenylsulfone) were determined radiometrically for ten strains each of the Mycobacterium avium complex (MAC) and Mycobacterium tuberculosis. MICs ranged from 50 to 250 micrograms/ml for Mycobacterium tuberculosis and from 2 to 100 micrograms/ml for MAC. However, at a concentration as low as 1.5 micrograms/ml dapsone significantly inhibited growth of MAC bacteria when used in combination with other drugs specifically acting at the mycobacterial cell-wall level. The latter drugs were used in subinhibitory concentrations, and included m-fluorophenylalanine (an inhibitor of mycoside-C biosynthesis), ethambutol (an inhibitor of arabinogalactan biosynthesis), and ethionamide (an inhibitor of mycolic acid biosynthesis). Using a radiometric method (Bactec 460-TB), the activity of dapsone was found to be enhanced for 2/10 strains in the presence of m-fluorophenylalanine, for 3/10 strains in the presence of ethambutol and for 5/10 strains in the presence of ethionamide. A satisfactory correlation between the radiometric data and bacterial viable counts was established.
MeSH Terms
Cell Wall/drug effects
Dapsone/pharmacology
Drug Combinations
Ethambutol/pharmacology
Ethionamide/pharmacology
Microbial Sensitivity Tests
Mycobacterium avium Complex/drug effects
Mycobacterium tuberculosis/drug effects
Phenylalanine/analogs & derivatives,pharmacology
Chemicals
Drug Combinations
3-fluorophenylalanine
Phenylalanine
Ethambutol
Dapsone
Ethionamide
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Rastogi N
Laboratoire de la Tuberculose et des Mycobactéries, Institut Pasteur, Point-à-Pitre, Guadeloupe.
Goh K S
Labrousse V
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