Journal Article

The Influence of Human N-Acetyltransferase Genotype on the Early Bactericidal Activity of Isoniazid

P.R Donald, F.A. Sirgel, A. Venter, D.P. Parkin, H.I. Seifart, B.W. van de Wal, C. Werely, P.D. van Helden and J.S. Maritz

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 39, issue 10, pages 1425-1430
Published in print November 2004 | ISSN: 1058-4838
Published online November 2004 | e-ISSN: 1537-6591 | DOI: http://dx.doi.org/10.1086/424999
The Influence of Human N-Acetyltransferase Genotype on the Early Bactericidal Activity of Isoniazid

More Like This

Show all results sharing these subjects:

  • Infectious Diseases
  • Immunology
  • Public Health and Epidemiology
  • Microbiology

GO

Show Summary Details

Preview

The elimination of isoniazid is subject to the influence of the N-acetyltransferase 2 (NAT2) genotype, and individuals may be homozygotic slow, heterozygotic fast, or homozygotic fast acetylators of isoniazid. The early bactericidal activity (EBA) of an antituberculosis agent can be determined by quantitative culture of Mycobacterium tuberculosis in sputum samples obtained from patients with pulmonary tuberculosis during the first days of treatment. In these studies, the EBA of isoniazid during the first 2 days of treatment was determined for 97 patients with sputum smear-positive pulmonary tuberculosis following isoniazid doses of ⩽37.5 mg, 75 mg, 150 mg, 300 mg, and 600 mg. The NAT2 genotype was determined in 70 patients, and the association between EBA and genotype was examined in this subgroup. Similarly, the relationship between EBA and isoniazid serum concentration was evaluated in 87 patients. The mean EBA of isoniazid increased with dose, but it levelled off between doses of 150 mg (mean EBA, 0.572) and 300 mg (mean EBA, 0.553). Significant differences were found in the mean EBA of isoniazid between the homozygous slow acetylator group and the heterozygous fast acetylator group and between the homozygous slow acetylator group and the homozygous fast acetylator group, but not between the heterozygous fast acetylator group and the homozygous fast acetylator group. The EBA appeared to reach a maximum at a 2-h isoniazid concentration of 2–3 µg/mL. These data confirm a significant effect of NAT2 genotype on the EBA of isoniazid over a range of doses.

Journal Article.  4022 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.