PPAR-α acutely inhibits functional activity of ASICs in rat dorsal root ganglion neurons.
PPAR-α acutely inhibits functional activity of ASICs in rat dorsal root ganglion neurons.
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PPAR-α 急性抑制大鼠背根神经节 ASIC 的功能活性
DOI:
10.18632/oncotarget.21805
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发表时间:
2017-11-03
期刊:
影响因子:
--
通讯作者:
Hu WP
中科院分区:
文献类型:
--
作者:
Wu J;Wang JJ;Liu TT;Zhou YM;Qiu CY;Shen DW;Hu WP
Peroxisome proliferator-activated receptor-α (PPAR-α), a lipid activated transcription factor of nuclear hormone receptor superfamily, can relieve pain through a rapid-response mechanism. However, little is known about the underlying mechanism. Herein, we report that PPAR-α activation acutely inhibits the functional activity of acid-sensing ion channels (ASICs), key sensors for extracellular protons, in rat dorsal root ganglion (DRG) neurons. Pre-application of PPAR-α agonist GW7647 for 2 min decreased the amplitude of proton-gated currents mediated by ASICs in a concentration-dependent manner. GW7647 shifted the concentration-response curve for proton downwards, with a decrease of 36.9 ± 2.3% in the maximal current response to proton. GW7647 inhibition of proton-gated currents can be blocked by GW6471, a selective PPAR-α antagonist. Moreover, PPAR-α activation decreased the number of acidosis-evoked action potentials in rat DRG neurons. Finally, peripheral administration of GW7647 dose-dependently relieved nociceptive responses to injection of acetic acid in rats. These results indicated that activation of peripheral PPAR-α acutely inhibited functional activity of ASICs in a non-genomic manner, which revealed a novel mechanism underlying rapid analgesia through peripheral PPAR-α.
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