A cell permeable NPE caged ADP-ribose for studying TRPM2.

A cell permeable NPE caged ADP-ribose for studying TRPM2.
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用于研究 TRPM2 的细胞渗透性 NPE 笼状 ADP-核糖

DOI:
10.1371/journal.pone.0051028
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Yue J
Yue J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yu P;Wang Q;Zhang LH;Lee HC;Zhang L;Yue J

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瞬时电位受体melastatin-2(TRPM 2)是TRPM通道亚家族的一个非选择性钙离子通道,主要被细胞内二磷酸腺苷核糖(ADPR)激活。在这里,我们合成了1-(2-硝基苯基)乙基笼状ADPR(NPE-ADPR),并发现NPE-ADPR的解开有效地刺激完整的人Jurkat T淋巴细胞中的Ca 2+,Mg 2+和Zn 2+以浓度依赖性方式内流。阳离子内流被抑制剂或TRPM 2的敲低抑制。同样地,NPE-ADPR的解笼显著诱导过表达TRPM 2的HEK 293细胞中的阳离子进入。正如预期的那样,高温增加了光解的NPE-ADPR诱导阳离子进入的能力,而酸性pH抑制。此外,细胞外Ca ~(2+)的缺乏显着抑制Mg ~(2+)和Zn ~(2+)的内流后解开NPE-ADPR。另一方面,细胞外Na+或Mg 2+的缺乏对光解NPE-ADPR诱导的Ca 2+内流没有影响。总之,我们的结果表明,NPE-ADPR是一种细胞渗透性ADPR类似物,可用于研究TRPM 2介导的阳离子进入完整细胞。
Transient potential receptor melastatin-2 (TRPM2) is a non-selective Ca2+-permeable cation channel of the TRPM channel subfamily and is mainly activated by intracellular adenosine diphosphate ribose (ADPR). Here we synthesized a 1-(2-nitrophenyl)ethyl caged ADPR (NPE-ADPR) and found that uncaging of NPE-ADPR efficiently stimulated Ca2+, Mg2+, and Zn2+ influx in a concentration-dependent manner in intact human Jurkat T-lymphocytes. The cation influx was inhibited by inhibitors or knockdown of TRPM2. Likewise, uncaging of NPE-ADPR markedly induced cation entry in HEK 293 cells that overexpress TRPM2. As expected, high temperature increased the ability of the photolyzed NPE-ADPR to induce cation entry, whereas acidic pH inhibited. Moreover, the absence of extracellular Ca2+ significantly inhibited Mg2+ and Zn2+ influx after uncaging NPE-ADPR. On the other hand, the absence of extracellular Na+ or Mg2+ had no effect on photolyzed NPE-ADPR induced Ca2+ entry. Taken together, our results indicated that NPE-ADPR is a cell permeable ADPR analogue that is useful for studying TRPM2-mediated cation entry in intact cells.
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