Detection of pyrazinamide heteroresistance in Mycobacterium tuberculosis
نویسندگان
چکیده
منابع مشابه
Host Targeted Activity of Pyrazinamide in Mycobacterium tuberculosis Infection
Pyrazinamide (PZA) is one of the first line antibiotics used for the treatment of tuberculosis (TB). In the present study, we have used in vitro and in vivo systems to investigate whether PZA, in addition to its known anti-mycobacterial properties, modulate the host immune response during Mycobacterium tuberculosis (Mtb) infection. In vitro we have examined the effect of PZA on cytokine and che...
متن کاملCharacterization of pncA mutations in pyrazinamide-resistant Mycobacterium tuberculosis.
Pyrazinamide (PZA) is a first-line drug for short-course tuberculosis therapy. Resistance to PZA is usually accompanied by loss of pyrazinamidase (PZase) activity in Mycobacterium tuberculosis. PZase converts PZA to bactericidal pyrazinoic acid, and the loss of PZase activity is associated with PZA resistance. The gene (pncA) encoding the M. tuberculosis PZase has recently been sequenced, and m...
متن کامل[Phenotypic characterization of pyrazinamide-resistant Mycobacterium tuberculosis isolated in Poland].
INTRODUCTION Pyrazinamide (PZA) is an important first-line antituberculous drug, which is applied together with INH, RMP, EMB and SM. This drug plays a unique role in the first phase of TB therapy because it is active within macrophages and kills tubercule bacilli. Testing of the resistibility of Mycobacterium tuberculosis to PZA is technically difficult because PZA is active only at acid pH. T...
متن کاملpncA mutations in pyrazinamide-resistant Mycobacterium tuberculosis isolates in Portugal.
The nucleotide sequences of the pncA genes within 55 multidrug-resistant pyrazinamide-resistant Mycobacterium tuberculosis clinical isolates were determined. Fifty-three out of the 55 isolates were pyrazinamidase (PZase) negative. Four strains contained a wild-type pncA gene, and PZase activity was undetectable in two of these strains. Seven of the 18 identified pncA mutations found have not be...
متن کاملEvaluation of colorimetric methods using nicotinamide for rapid detection of pyrazinamide resistance in Mycobacterium tuberculosis.
The direct detection of pyrazinamide resistance in Mycobacterium tuberculosis is sufficiently difficult that many laboratories do not attempt it. Most pyrazinamide resistance is caused by mutations that inactivate the pyrazinamidase enzyme needed to convert the prodrug pyrazinamide to its active form. We evaluated two newer and simpler methods to assess pyrazinamidase activity, the nitrate redu...
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ژورنال
عنوان ژورنال: International Journal of Mycobacteriology
سال: 2015
ISSN: 2212-5531
DOI: 10.1016/j.ijmyco.2014.09.013