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Reversible overexpression of bace1-cleaved neuregulin-1 N-terminal fragment induces schizophrenia-like phenotypes in mice.

Abstract：

BACKGROUND:Neuregulin-1 (Nrg1) is a pleiotropic signaling molecule that regulates neural development, and mutation of Nrg1 is a risk factor for schizophrenia. Cleavage of type I β1 Nrg1 isoform by Bace1 releases a secreted N-terminal fragment (Nrg1-ntfβ), which can bind to a cognate ErbB receptor to activate the specific signaling cascade. This study aimed to determine whether increased expression of Nrg1 is beneficial for brain development and functions. METHODS:We generated transgenic mice overexpressing this fragment under the control of a tetracycline-inducible promoter and examined functional and behavioral changes in mice upon reversible expression of the transgene. RESULTS:Increased expression of full-length Nrg1 in mouse neurons has been previously shown to enhance myelination in the central nervous system. Overexpressing Nrg1-ntfβ enhanced the expression of myelin proteins, consistent with the expected activation of the Nrg1 signaling pathway by Nrg1-ntfβ. Contrary to expectations, overexpressing Nrg1-ntfβ transgene caused schizophrenia-like behaviors in transgenic mice, and these abnormal behaviors were reversible if the expression of the Nrg1-ntfβ transgene was turned off. Our molecular assay suggests that protein levels of N-methyl-D-aspartate receptors are reduced in this transgenic mouse model, which might underlie the observed social and cognitive behavioral impairments. CONCLUSIONS:Our results indicate that overexpressing the secreted form of Nrg1 is sufficient to cause schizophrenia-like behaviors in a mouse model, meaning the effect is independent of the transmembrane and C-terminal domains of Nrg1. Hence, genetic gain-of-function mutations of Nrg1 are also risk factors for schizophrenia.

journal_name

Biol Psychiatry

journal_title

Biological psychiatry

authors

Luo X,He W,Hu X,Yan R

doi

10.1016/j.biopsych.2013.09.026

subject

Has Abstract

pub_date

2014-07-15 00:00:00

pages

120-7

issue

2

eissn

0006-3223

issn

1873-2402

pii

S0006-3223(13)00867-6

journal_volume

76

pub_type

杂志文章

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