Interplay between Calcium, Diacylglycerol, and Phosphorylation in the Spatial and Temporal Regulation of PKCα-GFP*
Interplay between Calcium, Diacylglycerol, and Phosphorylation in the Spatial and Temporal Regulation of PKCα-GFP*
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钙、二酰甘油和磷酸化在 PKCα-GFP* 时空调节中的相互作用
DOI:
10.1074/jbc.m201130200
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发表时间:
2002
期刊:
影响因子:
--
通讯作者:
Y. Tojyo
中科院分区:
文献类型:
--
作者:
A. Tanimura;A. Nezu;T. Morita;N. Hashimoto;Y. Tojyo
The function of protein kinase C (PKC) is closely regulated by its subcellular localization. We expressed PKCα fused to green fluorescent protein (PKCα-GFP) and examined its translocation in living and permeabilized cells of the human parotid cell line, HSY-EB. ATP induced an oscillatory translocation of PKCα-GFP to and from the plasma membrane that paralleled the appearance of repetitive Ca2+ spikes. Staurosporine attenuated the relocation of PKCα-GFP to the cytosol and caused a stepwise accumulation of PKCα-GFP at the plasma membrane during ATP stimulation. Diacylglycerol enhanced the amplitude and duration of the ATP-induced oscillatory translocation of PKCα-GFP. Ionomycin induced a transient translocation of PKCα-GFP to the plasma membrane despite the continuous elevation of cytosolic Ca2+. The ionomycin-induced transient translocation of PKCα-GFP was prolonged by staurosporine, diacylglycerol, and phorbol myristate acetate. Experiments using permeabilized cells showed that staurosporine or the elimination of ATP and Mg2+ decreases the rate of dissociation of PKCα-GFP from the membrane. Diacylglycerol slowed the dissociation of PKCα-GFP from the membrane regardless of the Ca2+ concentration. The effect of diacylglycerol was attenuated by ATP plus Mg2+ at low concentrations of Ca2+ (<500 nm) but not at high concentrations of Ca2+ (>1000 nm). These data suggest a complex interplay between Ca2+, diacylglycerol, and phosphorylation in the regulation of the membrane binding of PKCα.
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DOI:
--
发表时间:
1999
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
作者:
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通讯作者:
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影响因子:
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发表时间:
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