VAMP2-dependent exocytosis regulates plasma membrane insertion of TRPC3 channels and contributes to agonist-stimulated Ca2+ influx.

VAMP2-dependent exocytosis regulates plasma membrane insertion of TRPC3 channels and contributes to agonist-stimulated Ca2+ influx.
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VAMP2 依赖性胞吐作用调节 TRPC3 通道的质膜插入,并有助于激动剂刺激的 Ca2 流入。

DOI:
10.1016/j.molcel.2004.07.010
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发表时间:
2004
期刊:
影响因子:
16
通讯作者:
Ambudkar,InduS
Ambudkar,InduS
中科院分区:
生物学1区
文献类型:
--
作者:
Singh,BrijB;Lockwich,TimothyP;Bandyopadhyay,BidhanC;Liu,Xibao;Bollimuntha,Sunitha;Brazer,So-Ching;Combs,Christian;Das,Sunit;Leenders,AGMiriam;Sheng,Zu-Hang;Knepper,MarkA;Ambudkar,SureshV;Ambudkar,InduS

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激动剂刺激TRPC3通道的机制尚不清楚。在这里,我们证明TRPC3-N末端与VAMP2和αSNAP相互作用。此外,内源性和外源性表达的TRPC3与SNARE蛋白在神经元和上皮细胞中共定位和共免疫沉淀。GFP-TRPC3的成像显示其定位于质膜区和可移动的细胞内囊泡。brefeltin - a或BAPTA-AM对质膜区域进行光漂白后,TRPC3-GFP荧光恢复降低。破伤风毒素(TeNT)切割VAMP2不能阻止TRPC3向质膜区域传递,但可以降低其表面表达。TeNT也降低了碳水化合物和OAG,但没有降低信号素,刺激了Ca2+内流。重要的是,carbachol,而不是thapsigargin,增加了TRPC3的表面表达,而TRPC3被TeNT而不是BAPTA减弱。综上所述,这些数据表明,依赖vamp2的胞吐调节TRPC3通道的质膜插入,并有助于碳甾醇刺激Ca2+内流。
The mechanism(s) involved in agonist-stimulation of TRPC3 channels is not yet known. Here we demonstrate that TRPC3-N terminus interacts with VAMP2 and αSNAP. Further, endogenous and exogenously expressed TRPC3 colocalized and coimmunoprecipitated with SNARE proteins in neuronal and epithelial cells. Imaging of GFP-TRPC3 revealed its localization in the plasma membrane region and in mobile intracellular vesicles. Recovery of TRPC3-GFP fluorescence after photobleaching of the plasma membrane region was decreased by brefeldin-A or BAPTA-AM. Cleavage of VAMP2 with tetanus toxin (TeNT) did not prevent delivery of TRPC3 to the plasma membrane region but reduced its surface expression. TeNT also decreased carbachol and OAG, but not thapsigargin, stimulated Ca2+influx. Importantly, carbachol, not thapsigargin, increased surface expression of TRPC3 that was attenuated by TeNT and not by BAPTA. In aggregate, these data suggest that VAMP2-dependent exocytosis regulates plasma membrane insertion of TRPC3 channels and contributes to carbachol-stimulation of Ca2+influx.
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