Hypotonicity-induced TRPV4 function in renal collecting duct cells: modulation by progressive cross-talk with Ca2+-activated K+ channels.

Hypotonicity-induced TRPV4 function in renal collecting duct cells: modulation by progressive cross-talk with Ca2+-activated K+ channels.
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DOI:
10.1016/j.ceca.2011.11.011
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发表时间:
2012-02
期刊:
影响因子:
4
通讯作者:
O'Neil RG
O'Neil RG
中科院分区:
生物学2区
文献类型:
--
作者:
Jin M;Berrout J;Chen L;O'Neil RG

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小鼠皮质集合管 (CCD) M-1 细胞在盖玻片上生长至汇合,以评估 TRPV4 和 Ca2+ 激活的 K+ 通道之间的相互作用。免疫细胞化学显示 TRPV4 以及 CCD 标记、aquaporin-2 和 Ca2+ 激活的 K+ 通道、小电导 SK3 (KCa2.3) 通道和大电导 BKα 通道 (KCa1.1) 的强表达。 TRPV4 过表达研究表明 K+ 通道对 TRPV4 的物理依赖性很小。然而,通过低渗肿胀(或 GSK1016790A,一种选择性激动剂)激活 TRPV4 或通过选择性拮抗剂 HC-067047 抑制,证明 SK3 和 BK-α 激活对 TRPV4 介导的 Ca2+ 流入有很强的依赖性。选择性抑制 BK-α 通道(伊贝里奥毒素)或 SK3 通道(apamin),从而使细胞去极化,进一步揭示了 TRPV4 介导的 Ca2+ 流入对两个 K+ 通道激活的显着依赖性。结论是 TRPV4 通道与 SK3 和 BK-α 通道之间存在协同串扰,以在通道组之间提供严格的功能调节。这种串扰本质上可能是渐进的,其中最初的 TRPV4 介导的 Ca2+ 流入将首先激活高度 Ca2+ 敏感的 SK3 通道,这反过来会导致 Ca2+ 流入增强并激活 Ca2+ 不太敏感的 BK 通道。
The mouse cortical collecting duct (CCD) M-1 cells were grown to confluency on coverslips to assess the interaction between TRPV4 and Ca2+-activated K+ channels. Immunocytochemistry demonstrated strong expression of TRPV4, along with the CCD marker, aquaporin-2, and the Ca2+-activated K+ channels, the small conductance SK3 (KCa2.3) channel and large conductance BKα channel (KCa1.1). TRPV4 overexpression studies demonstrated little physical dependency of the K+ channels on TRPV4. However, activation of TRPV4 by hypotonic swelling (or GSK1016790A, a selective agonist) or inhibition by the selective antagonist, HC-067047, demonstrated a strong dependency of SK3 and BK-α activation on TRPV4-mediated Ca2+ influx. Selective inhibition of BK-α channel (Iberiotoxin) or SK3 channel (apamin), thereby depolarizing the cells, further revealed a significant dependency of TRPV4-mediated Ca2+ influx on activation of both K+ channels. It is concluded that a synergistic cross-talk exists between the TRPV4 channel and SK3 and BK-α channels to provide a tight functional regulation between the channel groups. This cross-talk may be progressive in nature where the initial TRPV4-mediated Ca2+ influx would first activate the highly Ca2+-sensitive SK3 channel which, in turn, would lead to enhanced Ca2+ influx and activation of the less Ca2+-sensitive BK channel.
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