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首页> 外文期刊>Archives of Toxicology >Dual action of palmitoyl trifluoromethyl ketone (PACOCF3) on Ca2+ signaling: activation of extracellular Ca2+ influx and alteration of ATP- and bradykinin-induced Ca2+ responses in Madin Darby canine kidney cells.
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Dual action of palmitoyl trifluoromethyl ketone (PACOCF3) on Ca2+ signaling: activation of extracellular Ca2+ influx and alteration of ATP- and bradykinin-induced Ca2+ responses in Madin Darby canine kidney cells.

机译:棕榈酰三氟甲基酮(PACOCF3)对Ca2 +信号传导的双重作用:Madin Darby犬肾细胞中细胞外Ca2 +内流的激活以及ATP和缓激肽诱导的Ca2 +反应的改变。

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摘要

The effect of the phospholipase A2 inhibitor palmitoyl trifluoromethyl ketone (PACOCF3) on Ca2+ signaling in Madin Darby canine kidney (MDCK) cells was examined using fura-2 as the fluorescent Ca2+ indicator. At a concentration of 20 microM, PACOCF3 did not change basal cytosolic free calcium concentrations ([Ca2+]i), but at concentrations of 50-250 microM PACOCF3 induced an increase in [Ca2+]i by activating extracellular Ca2+ entry which was partly suppressed by 50 microM La3+. The effect of PACOCF3 was abolished by removal of extracellular Ca2+. PACOCF3 (10 microM) enhanced both the peak value and the area under the curve of the [Ca2+]i increase induced by 10 microM ATP and 1 microM bradykinin by potentiating extracellular Ca2+ influx without affecting internal Ca2+ release. Several other phospholipase A2 inhibitors had no effect on basal [Ca2+]i or agonist-induced [Ca2+]i increases. Collectively, the results suggest that PACOCF3 alters Ca2+ signaling in renal tubular cells in a manner independent of phospholipase A2 inhibition.
机译:使用fura-2作为荧光Ca2 +指示剂,检查了磷脂酶A2抑制剂棕榈酰三氟甲基酮(PACOCF3)对Madin Darby犬肾(MDCK)细胞Ca2 +信号传导的影响。在浓度为20 microM时,PACOCF3不会改变基础胞浆游离钙的浓度([Ca2 +] i),但是在浓度为50-250 microM时,PACOCF3通过激活细胞外Ca2 +进入而诱导[Ca2 +] i的增加,而该抑制作用部分受到抑制。 50 microM La3 +。 PACOCF3的作用通过去除细胞外Ca2 +而消除。 PACOCF3(10 microM)通过增强细胞外Ca2 +内流而不影响内部Ca2 +的释放,增强了10 microM ATP和1 microM缓激肽诱导的[Ca2 +] i增加的峰值和曲线下面积。其他几种磷脂酶A2抑制剂对基础[Ca2 +] i或激动剂诱导的[Ca2 +] i升高没有影响。总体而言,结果表明,PACOCF3以独立于磷脂酶A2抑制的方式改变了肾小管细胞中的Ca2 +信号传导。

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