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Tmem100 Is a Regulator of TRPA1-TRPV1 Complex and Contributes to Persistent Pain.

Research paper by Hao-Jui HJ Weng, Kush N KN Patel, Nathaniel A NA Jeske, Sonya M SM Bierbower, Wangyuan W Zou, Vinod V Tiwari, Qin Q Zheng, Zongxiang Z Tang, Gary C H GC Mo, Yan Y Wang, Yixun Y Geng, Jin J Zhang, Yun Y Guan, Armen N AN Akopian, Xinzhong X Dong

Indexed on: 03 Feb '15Published on: 03 Feb '15Published in: Neuron



Abstract

TRPA1 and TRPV1 are crucial pain mediators, but how their interaction contributes to persistent pain is unknown. Here, we identify Tmem100 as a potentiating modulator of TRPA1-V1 complexes. Tmem100 is coexpressed and forms a complex with TRPA1 and TRPV1 in DRG neurons. Tmem100-deficient mice show a reduction in inflammatory mechanical hyperalgesia and TRPA1- but not TRPV1-mediated pain. Single-channel recording in a heterologous system reveals that Tmem100 selectively potentiates TRPA1 activity in a TRPV1-dependent manner. Mechanistically, Tmem100 weakens the association of TRPA1 and TRPV1, thereby releasing the inhibition of TRPA1 by TRPV1. A Tmem100 mutant, Tmem100-3Q, exerts the opposite effect; i.e., it enhances the association of TRPA1 and TRPV1 and strongly inhibits TRPA1. Strikingly, a cell-permeable peptide (CPP) containing the C-terminal sequence of Tmem100-3Q mimics its effect and inhibits persistent pain. Our study unveils a context-dependent modulation of the TRPA1-V1 complex, and Tmem100-3Q CPP is a promising pain therapy.