Non-acidic activation of pain-related Acid-Sensing Ion Channel 3 by lipids

The EMBO Journal
Sébastien MarraEmmanuel Deval

Abstract

Extracellular pH variations are seen as the principal endogenous signal that triggers activation of Acid-Sensing Ion Channels (ASICs), which are basically considered as proton sensors, and are involved in various processes associated with tissue acidification. Here, we show that human painful inflammatory exudates, displaying non-acidic pH, induce a slow constitutive activation of human ASIC3 channels. This effect is largely driven by lipids, and we identify lysophosphatidylcholine (LPC) and arachidonic acid (AA) as endogenous activators of ASIC3 in the absence of any extracellular acidification. The combination of LPC and AA evokes robust depolarizing current in DRG neurons at physiological pH 7.4, increases nociceptive C-fiber firing, and induces pain behavior in rats, effects that are all prevented by ASIC3 blockers. Lipid-induced pain is also significantly reduced in ASIC3 knockout mice. These findings open new perspectives on the roles of ASIC3 in the absence of tissue pH variation, as well as on the contribution of those channels to lipid-mediated signaling.

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Citations

Mar 30, 2016·European Journal of Pharmacology·Vyacheslav S KorkoshDenis B Tikhonov
Jun 10, 2016·British Journal of Pharmacology·Emilie BoscardinStephan Kellenberger
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