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Capacitative Ca2+ entry involves Ca2+ influx factor in rat glioma C6 cells.

机译:电容性Ca2 +进入涉及大鼠神经胶质瘤C6细胞中的Ca2 +内流因子。

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Capacitative Ca2+ entry exists in rat glioma C6 cells; however, how the information of depletion of Ca2+ in intracellular stores transmits to the plasma membrane is unknown. In the present study, we examined whether Ca2+ influx factor (CIF) causes capacitative Ca2+ entry in C6 cells. CIF was extracted from non-treated (Non-CIF), bombesin-treated (BBS-CIF) and thapsigargin-treated (TG-CIF) C6 cells by a reverse-phase silica cartridge. The addition of BBS-CIF and TG-CIF gradually increased cytoplasmic Ca2+ concentration ([Ca2+]i) but Non-CIF did not increase [Ca2+]i. Neither BBS-CIF nor TG-CIF elevated [Ca2+]i in the absence of extracellular Ca2+. Gd3+ inhibited the increase in [Ca2+]i induced by BBS-CIF and TG-CIF. Genistein abolished an elevation of [Ca2+]i induced by BBS-CIF and TG-CIF. BBS-CIF and TG-CIF did not increase inositol 1,4,5-trisphosphate accumulation. The results suggest that capacitative Ca2+ entry is caused by CIF in rat glioma C6 cells.
机译:大鼠脑胶质瘤C6细胞中存在Ca2 +进入细胞;然而,细胞内存储中Ca2 +消耗的信息如何传递到质膜尚不清楚。在本研究中,我们检查了Ca2 +内流因子(CIF)是否导致C6细胞中的电容性Ca2 +进入。通过反相硅胶色谱柱从未经处理的(Non-CIF),经过蛙皮素处理的(BBS-CIF)和毒胡萝卜素处理的(TG-CIF)C6细胞中提取CIF。 BBS-CIF和TG-CIF的添加逐渐增加了细胞质Ca2 +浓度([Ca2 +] i),但Non-CIF并未增加[Ca2 +] i。在缺少细胞外Ca2 +的情况下,BBS-CIF和TG-CIF均未升高[Ca2 +] i。 Gd3 +抑制了BBS-CIF和TG-CIF诱导的[Ca2 +] i的增加。金雀异黄素废除了BBS-CIF和TG-CIF诱导的[Ca2 +] i升高。 BBS-CIF和TG-CIF没有增加肌醇1,4,5-三磷酸的积累。结果表明,在大鼠神经胶质瘤C6细胞中,CIF引起了Ca2 +的进入。

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