Neuregulin 1 Regulates Excitability of Fast-spiking Neurons Through Kv1.1 and Acts in Epilepsy

Overview

Journal Nat Neurosci

Date 2011 Dec 14

PMID 22158511

Citations 93

Authors

Ke-Xin Li

Ying-Mei Lu

Zheng-Hao Xu

Jing Zhang

Jun-Ming Zhu

Jian-Ming Zhang

Shu-Xia Cao

Xiao-Juan Chen

Zhong Chen

Jian-Hong Luo

Shumin Duan

Xiao-Ming Li

Affiliations

Soon will be listed here.

Abstract

Dysfunction of fast-spiking, parvalbumin-positive (FS-PV) interneurons is implicated in the pathogenesis of epilepsy. ErbB4, a key Neuregulin 1 (NRG1) receptor, is mainly expressed in this type of interneurons, and recent studies suggest that parvalbumin interneurons are a major target of NRG1-ErbB4 signaling in adult brain. Thus, we hypothesized that downregulation of NRG1-ErbB4 signaling in FS-PV interneurons is involved in epilepsy. We found that NRG1, through its receptor ErbB4, increased the intrinsic excitability of FS-PV interneurons. This effect was mediated by increasing the near-threshold responsiveness and decreasing the voltage threshold for action potentials through Kv1.1, a voltage-gated potassium channel. Furthermore, mice with specific deletion of ErbB4 in parvalbumin interneurons were more susceptible to pentylenetetrazole- and pilocarpine-induced models of epilepsy. Exogenous NRG1 delayed the onset of seizures and decreased their incidence and stage. Moreover, expression of ErbB4, but not ErbB2, was downregulated in human epileptogenic tissue. Together, our findings suggest that NRG1-ErbB4 signaling contributes to human epilepsy through regulating the excitability of FS-PV interneurons. ErbB4 may be a new target for anticonvulsant drugs in epilepsy.

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