Gαq Sensitizes TRPM8 to Inhibition by PI(4,5)P2 Depletion upon Receptor Activation
| Autor: | Tibor Rohacs, Luyu Liu, Chifei Kang, Natalia Shirokova, Yevgen Yudin, Janhavi Nagwekar |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
biology Phospholipase C Chemistry G protein General Neuroscience Cell biology 03 medical and health sciences Transient receptor potential channel 030104 developmental biology 0302 clinical medicine Gq alpha subunit TRPM8 biology.protein Receptor Research Articles 030217 neurology & neurosurgery Ion channel G protein-coupled receptor |
| Zdroj: | The Journal of Neuroscience. 39:6067-6080 |
| ISSN: | 1529-2401 0270-6474 |
| Popis: | The cold- and menthol-sensitive transient receptor potential melastatin 8 (TRPM8) channel is important for both physiological temperature detection and cold allodynia. Activation of G-protein-coupled receptors (GPCRs) by proinflammatory mediators inhibits these channels. It was proposed that this inhibition proceeds via direct binding of G(αq) to the channel. TRPM8 requires the plasma membrane phospholipid phosphatidylinositol 4,5-bisphosphate [PI(4,5)P(2) or PIP(2)] for activity. However, it was claimed that a decrease in cellular levels of this lipid upon receptor activation does not contribute to channel inhibition. Here, we show that supplementing the whole-cell patch pipette with PI(4,5)P(2) reduced inhibition of TRPM8 by activation of G(αq)-coupled receptors in mouse dorsal root ganglion (DRG) neurons isolated from both sexes. Stimulating the same receptors activated phospholipase C (PLC) and decreased plasma membrane PI(4,5)P(2) levels in these neurons. PI(4,5)P(2) also reduced inhibition of TRPM8 by activation of heterologously expressed muscarinic M1 receptors. Coexpression of a constitutively active G(αq) protein that does not couple to PLC inhibited TRPM8 activity, and in cells expressing this protein, decreasing PI(4,5)P(2) levels using a voltage-sensitive 5′-phosphatase induced a stronger inhibition of TRPM8 activity than in control cells. Our data indicate that, upon GPCR activation, G(αq) binding reduces the apparent affinity of TRPM8 for PI(4,5)P(2) and thus sensitizes the channel to inhibition induced by decreasing PI(4,5)P(2) levels. SIGNIFICANCE STATEMENT Increased sensitivity to heat in inflammation is partially mediated by inhibition of the cold- and menthol-sensitive transient receptor potential melastatin 8 (TRPM8) ion channels. Most inflammatory mediators act via G-protein-coupled receptors that activate the phospholipase C pathway, leading to the hydrolysis of phosphatidylinositol 4,5-bisphosphate [PI(4,5)P(2)]. How receptor activation by inflammatory mediators leads to TRPM8 inhibition is not well understood. Here, we propose that direct binding of G(αq) both reduces TRPM8 activity and sensitizes the channel to inhibition by decreased levels of its cofactor, PI(4,5)P(2). Our data demonstrate the convergence of two downstream effectors of receptor activation, G(αq) and PI(4,5)P(2) hydrolysis, in the regulation of TRPM8. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|