PYRAZINAMIDE/PYRAZINOIC ACID RESISTANCE IN MYCOBACTERIUM TUBERCULOSIS: RECENT FINDINGS AND IMPLICATIONS FOR IMPROVING THE TREATMENT OF TUBERCULOSIS

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Abstract

Abstract. Pyrazinamide (PZA) is unique in that it is a component of the first line therapy for drug sensitive tuberculosis and in most current and experimental treatments also for multi drug resistant tuberculosis. Furthermore, PZA has been shown to help to ensure lasting cure and prevent relapse in shorter multi drug regimens. PZA is a prodrug. Mycobacterial tuberculosis (MTB) PncA enzyme activates the anti-mycobacterial prodrug PZA by transforming it into pyrazinoic acid (POA). The majority of clinical PZA resistant isolates contain mutations within the pncA gene and therefore remain sensitive to POA as they no longer activate PZA. Resistance to the active compound POA requires an alternative resistance mechanism and in vitro selected spontaneous MTB POA resistant mutants typically acquire a range of mutations in panD or mutations in one of a series of genes most of which are associated with the regulation of the bacterial stringent response. Clinically isolated PZA resistant MTB strains resistant to PZA and POA with mutations in any of these genes are unusual. Thus, it is likely the stringent response is critical for MTB in vivo and a damaged stringent response results in at least a reduction in fitness. Various lead compounds that disrupt the MTB stringent response have been identified that might form the basis for drugs with activity against latent mycobacteria with the potential to shorten tuberculosis treatment. Here we discuss the role of latency in the lifecycle of MTB and possible links to the activity PZA with a focus on potential new targets and drugs.

About the authors

R. M. Anthony

National Institute for Public Health and the Environment, Bilthoven

Author for correspondence.
Email: richard.anthony@rivm.nl

Richard M. Anthony, Senior Scientist, National Institute for Public Health
and the Environment (RIVM)

P.O. Box 1, 3720 BA Bilthoven, The Netherlands,
National Institute for Public Health and the Environment (RIVM).
Phone: +31302742363. Fax: +31302744418

Нидерланды

A. L. den Hertog

Institute for Life Sciences and Chemistry, HU University of Applied Sciences, Utrecht

Email: fake@neicon.ru
PhD Lecturer, Institute for Life Sciences and Chemistry, HU University of Applied Sciences Нидерланды

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