Nitrite impacts the survival of Mycobacterium tuberculosis in response to isoniazid and hydrogen peroxide.

Nitrite impacts the survival of Mycobacterium tuberculosis in response to isoniazid and hydrogen peroxide.
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DOI:
10.1002/mbo3.126
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发表时间:
2013-12
期刊:
影响因子:
3.4
通讯作者:
Nathan, Carl F.
Nathan, Carl F.
中科院分区:
生物学3区
文献类型:
--
作者:
Cunningham-Bussel, Amy;Bange, Franz C.;Nathan, Carl F.

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当接触分子氧受到限制时,结核分枝杆菌(Mtb)可以呼吸另一种电子受体--硝酸盐。我们发现,在体外感染的原代人巨噬细胞内,结核分枝杆菌在生理组织氧分压下呼吸硝酸盐,产生丰富的亚硝酸盐。在巨噬细胞感染过程中,缺乏功能硝酸还原酶的结核分枝杆菌菌株比野生型结核分枝杆菌对异烟肼更敏感。同样,在无菌培养中,硝酸还原酶缺陷型Mtb比野生型Mtb对异烟肼更敏感,对过氧化氢的抗性更强。外源亚硝酸盐的加入逆转了这些表型。进一步研究表明,亚硝酸盐可能对细菌过氧化氢酶有抑制作用。在一定程度上,结核分枝杆菌本身是结核分枝杆菌内作用的亚硝酸盐的最相关来源,这些发现表明,结核分枝杆菌硝酸盐转运体或硝酸还原酶的抑制剂可以增强异烟肼的疗效。
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.
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