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Functional Interaction between Transient Receptor Potential V4 Channel and Neuronal Calcium Sensor 1 and the Effects of Paclitaxel
Molecular Pharmacology ( IF 3.2 ) Pub Date : 2021-09-01 , DOI: 10.1124/molpharm.121.000244
Julio C Sánchez 1 , Barbara E Ehrlich 2
Affiliation  

Neuronal calcium sensor 1 (NCS1), a calcium-binding protein, and transient receptor potential V4 (TRPV4), a plasma membrane calcium channel, are fundamental in the regulation of calcium homeostasis. The interactions of these proteins and their regulation by paclitaxel (PTX) were investigated using biochemical, pharmacological, and electrophysiological approaches in both a breast cancer epithelial cell model and a neuronal model. TRPV4 and NCS1 reciprocally immunoprecipitated each other, suggesting that they make up a signaling complex. The functional consequence of this physical association was that TRPV4 currents increased with increased NCS1 expression. Calcium fluxes through TRPV4 correlated with the magnitude of TRPV4 currents, and these calcium fluxes depended on NCS1 expression levels. Exposure to PTX amplified the acute effects of TRPV4 expression, currents, and calcium fluxes but decreased the expression of NCS1. These findings augment the understanding of the properties of TRPV4, the role of NCS1 in the regulation of TRPV4, and the cellular mechanisms of PTX-induced neuropathy.

中文翻译:

瞬时受体电位 V4 通道与神经钙传感器 1 之间的功能相互作用及紫杉醇的作用

神经元钙传感器 1 (NCS1)(一种钙结合蛋白)和瞬时受体电位 V4 (TRPV4)(一种质膜钙通道)是钙稳态调节的基础。使用生化、药理学和电生理学方法在乳腺癌上皮细胞模型和神经元模型中研究了这些蛋白质的相互作用及其紫杉醇 (PTX) 的调节。TRPV4 和 NCS1 相互免疫沉淀,表明它们组成了一个信号复合物。这种物理关联的功能结果是 TRPV4 电流随着 NCS1 表达的增加而增加。通过 TRPV4 的钙通量与 TRPV4 电流的大小相关,并且这些钙通量取决于 NCS1 表达水平。暴露于 PTX 会放大 TRPV4 表达、电流和钙通量的急性效应,但会降低 NCS1 的表达。这些发现增强了对 TRPV4 特性、NCS1 在 TRPV4 调节中的作用以及 PTX 诱导神经病变的细胞机制的理解。
更新日期:2021-09-08
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