Jing-Jing Yan, Xiao-Jing Ding, Ting He, Ai-Xiao Chen, Wen Zhang, Zi-Xian Yu, Xin-Yu Cheng, Chuan-Yao Wei, Qiao-Dan Hu, Xiao-Yao Liu, Yan-Li Zhang, Mengge He, Zhi-Yong Xie, Xi Zha, Chun Xu, Peng Cao, Haohong Li, and Xiao-Hong Xu
Behavioral observations suggest a connection between anxiety and predator defense, but the underlying neural mechanisms remain unclear. Here we examine the role of the anterior hypothalamic nucleus (AHN), a node in the predator defense network, in anxiety-like behaviors. By in vivo recordings in male mice, we find that activity of AHN GABAergic (AHNVgat+) neurons shows individually stable increases when animals approach unfamiliar objects in an open field (OF) or when they explore the open-arm of an elevated plus-maze (EPM). Moreover, object-evoked AHN activity overlap with predator cue responses and correlate with the object and open-arm avoidance. Crucially, exploration-triggered optogenetic inhibition of AHNVgat+ neurons reduces object and open-arm avoidance. Furthermore, retrograde viral tracing identifies the ventral subiculum (vSub) of the hippocampal formation as a significant input to AHNVgat+ neurons in driving avoidance behaviors in anxiogenic situations. Thus, convergent activation of AHNVgat+ neurons serves as a shared mechanism between anxiety and predator defense to promote behavioral avoidance.
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