EGF induces efficient Cx43 gap junction endocytosis in mouse embryonic stem cell colonies via phosphorylation of Ser262, Ser279/282, and Ser368.
EGF induces efficient Cx43 gap junction endocytosis in mouse embryonic stem cell colonies via phosphorylation of Ser262, Ser279/282, and Ser368.
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EGF通过SER262,SER279/282和SER368的磷酸化诱导小鼠胚胎干细胞菌落中的有效CX43间隙内吞作用。
DOI:
10.1016/j.febslet.2014.01.048
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发表时间:
2014-03-03
期刊:
影响因子:
3.5
通讯作者:
Falk MM
中科院分区:
文献类型:
--
作者:
Fong JT;Nimlamool W;Falk MM
Gap junctions (GJ) traverse apposing membranes of neighboring cells to mediate intercellular communication by passive diffusion of signaling molecules. We have shown previously that cells endocytose GJs utilizing the clathrin machinery. Endocytosis generates cytoplasmic double-membrane vesicles termed annular gap junctions or connexosomes. However, the signaling pathways and protein modifications that trigger GJ endocytosis are largely unknown. Treating mouse embryonic stem cell colonies - endogenously expressing the GJ protein connexin43 (Cx43) - with epidermal growth factor (EGF) inhibited intercellular communication by 64% and activated both, MAPK and PKC signaling cascades to phosphorylate Cx43 on serines 262, 279/282, and 368. Upon EGF treatment Cx43 phosphorylation transiently increased up to 4 fold and induced efficient (66.4%) GJ endocytosis as evidenced by a 5.9 fold increase in Cx43/clathrin co-precipitation.
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