Referenced in: none

Automatically associated channels: Kir6.1

Title: EPAC inhibition of SUR1 receptor increases glutamate release and seizure vulnerability.

Authors: Kunpeng Zhao, Ruojian Wen, Xiaoxi Wang, Lei Pei, Ying Yang, You Shang, Nicolas Bazan, Ling-Qiang Zhu, Qing Tian, Youming Lu

Journal, date & volume: J. Neurosci., 2013 May 15 , 33, 8861-5

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/23678128

Abstract
EPAC (Exchange Proteins Activated by cAMP) regulates glutamate transmitter release in the central neurons, but a role underlying this regulation has yet to be identified. Here we show that EPAC binds directly to the intracellular loop of an ATP-sensitive potassium (KATP) channel type-1 sulfonylurea receptor (SUR1) receptor consisting of amino acids 859-881 (SUR1(859-881)). Ablation of EPAC or expression of SUR1(859-881), which intercepts EPAC-SUR1 binding, increases the open probability of KATP channels consisting of the Kir6.1 subunit and SUR1. Opening of KATP channels inhibits glutamate release and reduces seizure vulnerability in adult mice. Therefore, EPAC interaction with SUR1 controls seizure susceptibility and possibly acts via regulation of glutamate release.