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
Hu WP
中科院分区:
其他
文献类型:
--
作者:
Wu J;Wang JJ;Liu TT;Zhou YM;Qiu CY;Shen DW;Hu WP

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过氧化物酶体增殖物激活受体-α(Peroxisome proliferator-activated receptor-α,PPAR-α)是核激素受体超家族的一种脂质激活的转录因子,能通过快速反应机制缓解疼痛。然而,人们对潜在的机制知之甚少。在此,我们报道了在大鼠背根神经节(DRG)神经元中,PPAR-α激活急性抑制酸敏感离子通道(ASICs)的功能活性,ASICs是细胞外质子的关键传感器。预先应用PPAR-α激动剂GW 7647 2 min可浓度依赖性地降低ASICs介导的质子门控电流幅度。GW 7647使质子浓度-反应曲线下移,最大质子反应电流降低36.9 ± 2.3%。GW 7647对质子门控电流的抑制作用可被选择性PPAR-α拮抗剂GW 6471阻断。此外,激活PPAR-α可减少大鼠DRG神经元酸中毒诱发的动作电位数目。最后,GW 7647剂量依赖性地减轻大鼠对注射乙酸的伤害性反应。这些结果表明,外周PPAR-α的激活以非基因组方式急性抑制ASICs的功能活性,这揭示了外周PPAR-α快速镇痛的新机制。
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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