The effect of K(+) on caspase activity of corneal epithelial cells exposed to UVB.

The effect of K(+) on caspase activity of corneal epithelial cells exposed to UVB.
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DOI:
10.1016/j.exer.2016.07.014
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发表时间:
2016-10
影响因子:
3.4
通讯作者:
Ubels, John L.
Ubels, John L.
中科院分区:
医学3区
文献类型:
--
作者:
Leerar, John R.;Glupker, Courtney D.;Schotanus, Mark P.;Ubels, John L.

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人角膜缘上皮 (HCLE) 细胞暴露于 UVB 会通过激活 caspase-9、-8 和 -3 引发 K+ 快速丢失和细胞凋亡。研究表明,防止细胞内 K+ 丢失可以抑制细胞凋亡。本研究的目的是研究 K+ 对 UVB 诱导的 caspase 活性的影响。将 HCLE 细胞暴露于 150 mJ/cm2 UVB,然后测量细胞裂解物中的 caspase 活性。在反应缓冲液中存在和不存在 100 mM K+ 的情况下测量 Caspase 活性。在 100 mM K+ 存在下,UVB 诱导的 caspase-9、-8 和 -3 活性均降低。这些结果表明细胞中高 [K+] 的作用是抑制 caspase 活性。因此,当细胞因 UVB 反应而失去 K+ 时,半胱天冬酶就会被激活,细胞就会进入凋亡状态。这支持了我们的假设:K+ 抑制 caspase 活性。
Exposure of human corneal limbal epithelial (HCLE) cells to UVB triggers rapid loss of K+ and apoptosis via activation of caspases-9, -8 and -3. It has been shown that preventing loss of intracellular K+ can inhibit apoptosis. The goal of this study was to investigate the effect of K+ on the UVB-induced caspase activity. HCLE cells were exposed to 150 mJ/cm2 UVB, followed by measurement of caspase activity in cell lysates. Caspase activity was measured in the presence and absence of 100 mM K+ in the reaction buffer. UVB-induced activity of caspases-9, -8 and -3 all decreased in the presence of 100 mM K+. These results suggest that a role of high [K+] in the cell is to inhibit caspase activity. Therefore, when cells lose K+ in response to UVB, caspases are activated and cells go into apoptosis. This supports our hypothesis that K+ inhibits caspase activity.
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