Central amygdala NPBWR1 neurons facilitate social novelty seeking and new social interactions.

The formation of new social interactions is vital for social animals, but the underlying neural mechanisms remain poorly understood. We identified CeA neurons, a population in central amygdala expressing neuropeptide B/W receptor-1 (NPBWR1), that play a critical role in these interactions. CeA neurons were activated during encounters with unfamiliar, but not with familiar, mice. Manipulations of CeA neurons showed that their excitation is essential for maintaining physical interactions with novel conspecifics. Activation of CeA neurons alleviated social deficits induced by chronic social defeat stress, suggesting therapeutic potential. Conversely, overexpression of human in CeA neurons reduced activity of these neurons and impaired social interactions with unfamiliar mice. This effect was absent in a polymorphic variant of the human NPBWR1 gene (404A>T). These findings highlight how CeA neurons promote social novelty seeking and reveal a complex interplay between genetic variations and social behavior.