Hypotonic shocks activate rat TRPV4 in yeast in the absence of polyunsaturated fatty acids.

Hypotonic shocks activate rat TRPV4 in yeast in the absence of polyunsaturated fatty acids.
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DOI:
10.1016/j.febslet.2009.01.027
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发表时间:
2009-02-18
期刊:
影响因子:
3.5
通讯作者:
Kung, Ching
Kung, Ching
中科院分区:
生物学3区
文献类型:
--
作者:
Loukin, Stephen H.;Su, Zhenwei;Kung, Ching

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瞬时受体电位通道(TRP)是化学物质、热量和机械力感知的基础。我们在酵母中表达了大鼠TRPV1和TRPV4亚型,并使用转基因水母发光蛋白监测了它们在体内随着Ca 2+升高的活性。热和辣椒素激活TRPV1,但不激活TRPV4。低渗休克激活TRPV4,但不激活TRPV1。渗透膨胀被建模以激活酶,产生多不饱和脂肪酸(PUFA)以打开哺乳动物细胞中的TRPV 4。该模型将机械敏感性归因于酶而不是通道。酵母只有一个Δ9脂肪酸单去饱和酶,不能产生PUFA,这表明TRPV4活化的另一种机制。我们讨论了这种差异的可能解释。
Transient-receptor-potential channels (TRPs) underlie the sensing of chemicals, heat, and mechanical force. We expressed the rat TRPV1 and TRPV4 subtypes in yeast and monitored their activities in vivo as Ca2+ rise using transgenic aequorin. Heat and capsaicin activate TRPV1 but not TRPV4 in yeast. Hypotonic shocks activate TRPV4 but not TRPV1. Osmotic swelling is modeled to activate enzyme(s), producing polyunsaturated fatty acids (PUFAs) to open TRPV4 in mammalian cells. This model relegates mechanosensitivity to the enzyme and not the channel. Yeast has only a single Δ9 fatty-acid monodesaturase and cannot make PUFAs suggesting an alternative mechanism for TRPV4 activation. We discuss possible explanations of this difference.
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