Regulation of connexin43 gap junctional communication by phosphatidylinositol 4,5-bisphosphate.
Regulation of connexin43 gap junctional communication by phosphatidylinositol 4,5-bisphosphate.
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调节磷脂酰肌醇4,5-双磷酸的连接缝连接通信。
DOI:
10.1083/jcb.200610144
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发表时间:
2007-06-04
期刊:
影响因子:
--
通讯作者:
Moolenaar WH
中科院分区:
文献类型:
--
作者:
van Zeijl L;Ponsioen B;Giepmans BN;Ariaens A;Postma FR;Várnai P;Balla T;Divecha N;Jalink K;Moolenaar WH
Cell–cell communication through connexin43 (Cx43)-based gap junction channels is rapidly inhibited upon activation of various G protein–coupled receptors; however, the mechanism is unknown. We show that Cx43-based cell–cell communication is inhibited by depletion of phosphatidylinositol 4,5-bisphosphate (PtdIns[4,5]P2) from the plasma membrane. Knockdown of phospholipase Cβ3 (PLCβ3) inhibits PtdIns(4,5)P2 hydrolysis and keeps Cx43 channels open after receptor activation. Using a translocatable 5-phosphatase, we show that PtdIns(4,5)P2 depletion is sufficient to close Cx43 channels. When PtdIns(4,5)P2 is overproduced by PtdIns(4)P 5-kinase, Cx43 channel closure is impaired. We find that the Cx43 binding partner zona occludens 1 (ZO-1) interacts with PLCβ3 via its third PDZ domain. ZO-1 is essential for PtdIns(4,5)P2-hydrolyzing receptors to inhibit cell–cell communication, but not for receptor–PLC coupling. Our results show that PtdIns(4,5)P2 is a key regulator of Cx43 channel function, with no role for other second messengers, and suggest that ZO-1 assembles PLCβ3 and Cx43 into a signaling complex to allow regulation of cell–cell communication by localized changes in PtdIns(4,5)P2.
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影响因子:
4.1
作者:
HII, CST;OH, SY;MURRAY, AW
通讯作者:
MURRAY, AW
影响因子:
4.8
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Attramadal, H
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3.3
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Meda, P
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2.9
作者:
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影响因子:
9.2
作者:
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通讯作者:
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