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Social Isolation During Adolescence Induces Anxiety Behaviors and Enhances Firing Activity in BLA Pyramidal Neurons via mGluR5 Upregulation.
Molecular Neurobiology 2018 June
Social isolation during the vulnerable period of adolescence contributes to the occurrence of psychiatric disorders and profoundly affects brain development and adult behavior. Although the impact of social isolation during adolescence on anxiety behaviors has been well studied, much less is known about the onset and underlying mechanisms of these behaviors. We observed that following 2 weeks, but not 1 week, of social isolation, adolescent mice exhibited anxiety behaviors. Strikingly, the mGluR5 protein levels in the amygdala increased concomitantly with anxiety behaviors, and both intraperitoneal administration and intra-basolateral amygdala (BLA) infusion of MPEP, a metabotropic glutamate receptor 5 antagonist, normalized anxiety behaviors. Furthermore, electrophysiological studies showed that 2 weeks of social isolation during adolescence facilitated pyramidal neuronal excitability in the BLA, which could be normalized by MPEP. Together, these results reveal a critical period in adolescence during which social isolation can induce anxiety behaviors and facilitate BLA pyramidal neuronal excitability, both of which are mediated by mGluR5, thus providing mechanistic insights into the onset of anxiety behaviors after social isolation during adolescence.
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