首页> 外文期刊>The Journal of Antibiotics: An International Journal >Pro-caspase-3 protects cells from polymyxin B-induced cytotoxicity by preventing ROS accumulation
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Pro-caspase-3 protects cells from polymyxin B-induced cytotoxicity by preventing ROS accumulation

机译:通过防止ROS累积,pro-caspase-3保护来自多粘蛋白B诱导的细胞毒性的细胞

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摘要

Polymyxin B (PMB), a last-line antibiotic used against antibiotic-resistant superbugs, causes undesirable cytotoxic side effects. However, its mechanisms remain unknown. In this study, we unexpectedly found that caspase-3, a main executor of apoptosis, plays a protective role in PMB-induced cytotoxicity. Caspase-3 knockout (KO) cells exhibited higher susceptibility to PMB-induced cytotoxicity compared with wild-type (WT) cells, accompanied by increased levels of reactive oxygen species (ROS). Interestingly, co-treatment with the antioxidant N-acetylcysteine (NAC) rescued cell viability to a similar extent as WT cells. Furthermore, PMB failed to facilitate the processing of inactive caspase-3 (procaspase-3) into active forms, suggesting that pro-caspase-3 nonenzymatically suppresses PMB-driven ROS accumulation and its cytotoxicity. Thus, our findings that demonstrate the potential ability of PMB to stimulate ROS generation, but which is normally masked by pro-caspase-3-dependent mechanisms, may provide novel insights into the mechanisms of PMB-induced side effects.
机译:Polymyxin B(PMB)是针对抗生素抗性超照的最后一线抗生素,导致不希望的细胞毒性副作用。但是,它的机制仍然是未知的。在这项研究中,我们出乎意料发现Caspase-3是凋亡的主要执行者,在PMB诱导的细胞毒性中起着保护性作用。与野生型(WT)细胞相比,Caspase-3敲除(KO)细胞对PMB诱导的细胞毒性的敏感性较高,伴随着活性氧(ROS)的增加。有趣的是,与抗氧化剂N-乙酰半胱氨酸(NAC)的共同处理抵押于与WT细胞相似的细胞活力。此外,PMB未能促进将无活性的Caspase-3(Procaspase-3)加工成活性形式,表明Pro-Caspase-3非酶促抑制PMB驱动的ROS积累及其细胞毒性。因此,我们证明PMB刺激ROS产生的潜在能力的发现,但通常通过Pro-Caspase-3依赖机制掩盖,可以为PMB诱导的副作用的机制提供新的洞察。

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