The contribution of TRPV1 channel to 20-HETE–aggravated ischemic neuronal injury

Publication date: Available online 6 July 2018Source: Prostaglandins & Other Lipid MediatorsAuthor(s): Xiaofan Zhang, Nagat El Demerdash, John R. Falck, Sailu Munnuri, Raymond C. Koehler, Zeng-Jin YangABSTRACT20-Hydroxyeicosatetraenoic acid (20-HETE), a cytochrome P450 (CYP) 4 A/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 CYP4 A 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.
Source: Prostaglandins and Other Lipid Mediators - Category: Lipidology Source Type: research