Intracellular ATP concentration contributes to the cytotoxic and cytoprotective effects of adenosine.

Intracellular ATP concentration contributes to the cytotoxic and cytoprotective effects of adenosine.
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细胞内 ATP 浓度有助于腺苷的细胞毒性和细胞保护作用。

DOI:
10.1371/journal.pone.0076731
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Liu J
Liu J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li S;Li X;Guo H;Liu S;Huang H;Liu N;Yang C;Tang P;Liu J

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细胞外腺苷(Ade)通过两种途径与细胞相互作用:在纳摩尔/微摩尔浓度下激活细胞表面受体;在毫摩尔浓度下干扰细胞内核苷酸库的稳态。阿德显示细胞毒性和细胞保护作用,但其潜在机制仍不清楚。在本研究中,腺苷介导的ATP对细胞活力的影响进行了研究。腺苷处理被认为是在低细胞内ATP状态下的细胞保护,但在正常ATP状态下的细胞毒性。腺苷介导的细胞毒性和细胞保护作用依赖于腺苷衍生的ATP形成,但不通过腺苷受体途径。阿德增强了ATP产生介导的蛋白酶体抑制诱导的细胞死亡。这些数据提供了一个新的途径,腺苷发挥双重生物学效应的细胞活力,表明腺苷作为一个重要的作用,除了腺苷受体途径的ATP前体。
Extracellular adenosine (Ade) interacts with cells by two pathways: by activating cell surface receptors at nanomolar/micromolar concentrations; and by interfering with the homeostasis of the intracellular nucleotide pool at millimolar concentrations. Ade shows both cytotoxic and cytoprotective effects; however, the underlying mechanisms remain unclear. In the present study, the effects of adenosine-mediated ATP on cell viability were investigated. Adenosine treatment was found to be cytoprotective in the low intracellular ATP state, but cytotoxic under the normal ATP state. Adenosine-mediated cytotoxicity and cytoprotection rely on adenosine-derived ATP formation, but not via the adenosine receptor pathway. Ade enhanced proteasome inhibition-induced cell death mediated by ATP generation. These data provide a new pathway by which adenosine exerts dual biological effects on cell viability, suggesting an important role for adenosine as an ATP precursor besides the adenosine receptor pathway.
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