Nitric oxide-dependent pro-oxidant and pro-apoptotic effect of metallothioneins in HL-60 cells challenged with cupric nitrilotriacetate.

Nitric oxide-dependent pro-oxidant and pro-apoptotic effect of metallothioneins in HL-60 cells challenged with cupric nitrilotriacetate.
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金属硫蛋白在用次氮基三乙酸铜攻击的 HL-60 细胞中具有一氧化氮依赖性促氧化和促凋亡作用。

DOI:
10.1042/0264-6021:3540397
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发表时间:
2001
期刊:
The Biochemical journal
影响因子:
--
通讯作者:
Kagan,VE
Kagan,VE
中科院分区:
--
文献类型:
--
作者:
Liu,S;Kawai,K;Tyurin,VA;Tyurina,YY;Borisenko,GG;Fabisiak,JP;Quinn,PJ;Pitt,BR;Kagan,VE

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金属硫蛋白(MTs)的细胞内保护功能包括隔离过渡态和重金属、清除自由基和保护亲电试剂。我们报道MT对cu诱导的细胞毒性的保护可以逆转,并且在暴露于NO的HL-60细胞中可以诱导促氧化和促凋亡作用。我们证明,在zncl2预处理的HL-60细胞中,加载了硝基三乙酸铜(Cu-NTA),暴露于NO供体s -亚硝基-n -乙酰青霉胺,导致MT半胱氨酸的s -亚硝基化和氧化。MT与Cu结合的硫酸盐簇的破坏导致具有氧化还原活性的Cu的松动和释放,Cu的氧化还原循环活性增强,主要类膜磷脂的过氧化作用增加。我们还发现,在zncl2预处理/ cu - nta负载的HL-60细胞中,cu诱导的氧化应激伴随着细胞凋亡,表现为核形态的特征性变化、核体间DNA的切割、磷脂酰丝氨酸的外化、细胞色素从线粒体释放到细胞质中以及caspase-3的激活。我们得出结论,在cu挑战细胞中,NO可以逆转mt的保护作用,并将其转化为促氧化、促凋亡的工具。
Intracellular safeguarding functions of metallothioneins (MTs) include sequestering transition and heavy metals, scavenging free radicals and protecting against electrophiles. We report that MT protection against Cu-induced cytotoxicity can be reversed and pro-oxidant and pro-apoptotic effects can be induced in HL-60 cells exposed to NO. We demonstrate that in ZnCl2-pretreated HL-60 cells loaded with copper nitrilotriacetate (Cu-NTA), exposure to an NO donor,S-nitroso-N-acetyl penicillamine, resulted in S-nitrosylation and oxidation of MT cysteines. This disruption of MT Cu-binding thiolate clusters caused loosening and release of redox-active Cu, enhanced redox-cycling activity of Cu and increased peroxidation of major classes of membrane phospholipids. We also found that Cu-induced oxidative stress in ZnCl2-pretreated/Cu-NTA-loaded HL-60 cells was accompanied by apoptosis documented by characteristic changes of nuclear morphology, internucleosomal DNA cleavage, externalization of phosphatidylserine, release of cytochromecfrom mitochondria into cytosol and activation of caspase-3. We conclude that in Cu-challenged cells, NO can reverse the protective role of MTs and convert them into pro-oxidant, pro-apoptotic implements.
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