Evaluation of Structurally Related 3-Substituted 4-Amino-2-arylquinolines and 2-Aryl-4-methoxyquinolines for Potential Antimycobacterial Activity

Authors

  • Antoinette Labuschagné University of South Africa
  • Namrita Lall Department of Plant Science, University of Pretoria, Pretoria, South Africa
  • Malose J. Mphahlele Department of Plant Science, University of Pretoria, Pretoria, South Africa

Keywords:

antimycobacterial activity, Mycobacterium tuberculosis, immunomodulation, 2-aryl-4-methoxyquinolines, 4-amino-2-arylquinolines

Abstract

Series of structurally related 2-aryl-4-(amino/methoxy)quinoline derivatives were evaluated for potential antimycobacterial activity against Mycobacterium tuberculosis strain H37Rv. A complete inhibition of a drug sensitive strain of M. tuberculosis was observed at 20.0 µg/ml for 4-amino-2-(4-chlorophenyl)quinoline 3b, 4-amino-3-iodo-2-(4-methoxyphenyl)quinoline 5d, 4-amino-2,3-diphenylquinoline 6a, 4-amino-2-(4-fluorophenyl)-3-phenylquinoline 6b and 4-amino-2-(4-methoxyphenyl)-3-phenylquinoline 6d. These derivatives were further evaluated for activity against a multidrug resistant strain of M. tuberculosis. The minimum inhibitory concentration (MIC) against a two drug-resistant strain was found to be ≥5.0≤20.0 µg/ml. Systems 6a and 6b were, in turn, subjected to cytotoxicity assay using U937 human macrophages and their intracellular antimycobacterial activity was also determined. Moreover, these two 4-amino-2,3-diarylquinoline derivatives were also investigated for their immune modulatory effect according to Th1 and Th2-subset cytokines.

Author Biographies

Antoinette Labuschagné, University of South Africa

Chemistry and professor

Namrita Lall, Department of Plant Science, University of Pretoria, Pretoria, South Africa

Plant Science, Student

Malose J. Mphahlele, Department of Plant Science, University of Pretoria, Pretoria, South Africa

Plant Science and Associate Professor

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2013-07-18

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