TRPP2 and TRPV4 form a polymodal sensory channel complex.

TRPP2 and TRPV4 form a polymodal sensory channel complex.
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DOI:
10.1083/jcb.200805124
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发表时间:
2008-08-11
影响因子:
7.8
通讯作者:
Walz, Gerd
Walz, Gerd
中科院分区:
生物学1区
文献类型:
--
作者:
Koetttgen, Michael;Buchholz, Bjoern;Garcia-Gonzalez, Miguel A.;Kotsis, Fruzsina;Fu, Xiao;Doerken, Mara;Boehlke, Christopher;Steffl, Daniel;Tauber, Robert;Wegierski, Tomasz;Nitschke, Roland;Suzuki, Makoto;Kramer-Zucker, Albrecht;Germino, Gregory G.;Watnick, Terry;Prenen, Jean;Nilius, Bernd;Kuehn, E. Wolfgang;Walz, Gerd

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初级纤毛已经进化为一个多功能的细胞室,装饰大多数脊椎动物细胞。纤毛在各种器官中都能感受到机械刺激,但将纤毛的偏转转化为细胞内钙瞬变的分子机制仍然是难以捉摸的。多囊肾病中突变的多囊蛋白-2 (TRPP2)离子通道是纤毛介导的钙瞬变所必需的,但缺乏机械敏感性。我们在这里发现TRPP2利用TRPV4在纤毛中形成机械和热敏分子传感器。肾上皮细胞中TRPV4的缺失可消除血流诱导的钙瞬变,这表明TRPV4与TRPP2一样,是纤毛机械传感器的重要组成部分。由于trpv4缺陷斑马鱼和小鼠没有肾囊肿,我们的研究结果挑战了纤毛流感知缺陷构成肾囊肿发生基本机制的概念。
The primary cilium has evolved as a multifunctional cellular compartment that decorates most vertebrate cells. Cilia sense mechanical stimuli in various organs, but the molecular mechanisms that convert the deflection of cilia into intracellular calcium transients have remained elusive. Polycystin-2 (TRPP2), an ion channel mutated in polycystic kidney disease, is required for cilia-mediated calcium transients but lacks mechanosensitive properties. We find here that TRPP2 utilizes TRPV4 to form a mechano- and thermosensitive molecular sensor in the cilium. Depletion of TRPV4 in renal epithelial cells abolishes flow-induced calcium transients, demonstrating that TRPV4, like TRPP2, is an essential component of the ciliary mechanosensor. Because TRPV4-deficient zebrafish and mice lack renal cysts, our findings challenge the concept that defective ciliary flow sensing constitutes the fundamental mechanism of cystogenesis.
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