Diagnosing oxidative stress in bacteria: not as easy as you might think.

Diagnosing oxidative stress in bacteria: not as easy as you might think.
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DOI:
10.1016/j.mib.2015.01.004
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发表时间:
2015-04
影响因子:
5.4
通讯作者:
Imlay JA
Imlay JA
中科院分区:
生物学2区
文献类型:
--
作者:
Imlay JA

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微生物很容易受到细胞内活性氧 (ROS) 水平升高的影响。这种情况导致人们提出许多自然压力可能是有毒的,特别是因为它们加速内源性活性氧的形成。这种机制已在氧化还原循环化合物中得到令人信服的证明。然而,对于大多数其他压力源来说,证据要弱得多。临床抗生素产生致命活性氧应激的假说引起了广泛关注,作者讨论了支持或反对这一观点的一些证据。重要的是,即使所有细胞电子流以某种方式转移到 ROS 形成中,所产生的 H2O2 和 O2− 剂量也更有可能起到抑菌作用,而不是杀菌作用,除非同时阻断关键的防御机制。
Microorganisms are vulnerable to elevated levels of intracellular reactive oxygen species (ROS). This situation has led to proposals that many natural stresses might be toxic specifically because they accelerate endogenous ROS formation. Such a mechanism has been convincingly demonstrated for redox-cycling compounds. However, the evidence is much weaker for most other stressors. The hypothesis that clinical antibiotics generate lethal ROS stress has attracted much attention, and the author discusses some aspects of evidence that support or oppose this idea. Importantly, even if all cellular electron flow were somehow diverted to ROS formation, the resultant doses of H2O2 and O2− would more likely be bacteriostatic than bacteriocidal unless key defense mechanisms were simultaneously blocked.
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