The contribution of TRPV1 channel to 20-HETE-Aggravated ischemic neuronal injury.

The contribution of TRPV1 channel to 20-HETE-Aggravated ischemic neuronal injury.
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DOI:
10.1016/j.prostaglandins.2018.07.001
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发表时间:
2018-07
影响因子:
2.9
通讯作者:
Yang ZJ
Yang ZJ
中科院分区:
生物学3区
文献类型:
--
作者:
Zhang X;El Demerdash N;Falck JR;Munnuri S;Koehler RC;Yang ZJ

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20-羟基二十碳四烯酸 (20-HETE) 是一种细胞色素 P450 (CYP) 4A/4F 衍生的花生四烯酸代谢物,可直接导致缺血性神经元损伤。然而,对于缺血后 20-HETE 神经毒性的介质知之甚少。在这里,我们重点关注瞬时受体电位阳离子通道亚家族 V 成员 1 (TRPV1) 在 20-HETE 诱导的神经毒性中的作用。我们的结果表明 TRPV1 和 CYP4A 免疫反应性在神经元中共定位。 TRPV1 抑制可减弱 20-HETE 模拟物 20-5,14-HEDGE 诱导的活性氧 (ROS) 产生和培养神经元中的神经元损伤,并在体外和体内保护缺血神经元。 TRPV1 抑制与 20-HETE 合成抑制剂 HET0016 联合使用并没有产生额外的保护作用。此外,TRPV1 基因抑制和 NADPH 氧化酶抑制剂 gp91ds-dat 均以相似的程度减弱 ROS 的产生。然而,联合治疗并没有实现额外的减少。因此,我们得出结论,TRPV1通道参与了20-HETE的ROS生成和缺血后的神经毒性。
20-Hydroxyeicosatetraenoic acid (20-HETE), a cytochrome P450 (CYP) 4A/4F-derived metabolite of arachidonic acid, directly contributes to ischemic neuronal injury. However, little is known about mediators of 20-HETE neurotoxicity after ischemia. Here, we focus on the role of transient receptor potential cation channel subfamily V member 1 (TRPV1) in 20-HETE-induced neurotoxicity. Our results showed that TRPV1 and CYP4A immunoreactivity were colocalized in neurons. TRPV1 inhibition attenuated 20-HETE mimetic 20-5,14-HEDGE-induced reactive oxygen species (ROS) production and neuronal injury in cultured neurons and protected ischemic neurons in vitro and in vivo. TRPV1 inhibition in combination with 20-HETE synthesis inhibitor HET0016 did not produce additional protective effects. Furthermore, TRPV1 genetic inhibition and NADPH oxidase inhibitor gp91ds-dat each attenuated ROS production to a similar extent. However, combined treatment did not achieve additional reduction. Therefore, we conclude that TRPV1 channels are involved in 20-HETE’s ROS generation and neurotoxicity after ischemia.
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