Nitrite impacts the survival of Mycobacterium tuberculosis in response to isoniazid and hydrogen peroxide.
Microbiologyopen
; 2(6): 901-11, 2013 Dec.
Article
em En
| MEDLINE
| ID: mdl-24019302
ABSTRACT
When access to molecular oxygen is restricted, Mycobacterium tuberculosis (Mtb) can respire an alternative electron acceptor, nitrate. We found that Mtb within infected primary human macrophages in vitro at physiologic tissue oxygen tensions respired nitrate, generating copious nitrite. A strain of Mtb lacking a functioning nitrate reductase was more susceptible than wild-type Mtb to treatment with isoniazid during infection of macrophages. Likewise, nitrate reductase-deficient Mtb was more susceptible to isoniazid than wild-type Mtb in axenic culture, and more resistant to hydrogen peroxide. These phenotypes were reversed by the addition of exogenous nitrite. Further investigation suggested that nitrite might inhibit the bacterial catalase. To the extent that Mtb itself is the most relevant source of nitrite acting within Mtb, these findings suggest that inhibitors of Mtb's nitrate transporter or nitrate reductase could enhance the efficacy of isoniazid.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Viabilidade Microbiana
/
Peróxido de Hidrogênio
/
Isoniazida
/
Macrófagos
/
Antibacterianos
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Mycobacterium tuberculosis
/
Nitritos
Limite:
Humans
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article