Abstract
Social animals encounter both environmental and social stress, yet the mechanisms by which individuals with different levels of trait anxiety cope with these stressors, as well as the neurobiological links between trait anxiety and social cognition, remain incompletely understood. Here, male mice are classified into high-trait anxiety (HTA) and low-trait anxiety (LTA) groups based on their anxiety responses to elevated platform exposure in the open field test. Under observational learning-based vicarious social defeat stress (VSDS), HTA mice exhibit less social avoidance behavior toward CD1 aggressors than LTA mice. Fiber photometry reveals that HTA mice display higher activity of ventral tegmental area (VTA) dopaminergic (VTADA) neurons during environmental stress, while LTA mice exhibit greater VTADA neurons activity under social stress. Viral tracing identifies the connectivity of VTADA neurons and anterior cingulate cortex (ACC). Optogenetic and chemogenetic manipulations demonstrate that VTA-ACC dopaminergic circuit is necessary and sufficient for VSDS-induced social avoidance behavior in HTA and LTA mice. RNA-sequencing suggested that VTA neuroinflammatory signaling may be a key factor contributing to the difference between HTA and LTA mice. Thus, this study reveals a neural circuit mechanism for trait anxiety-related observational learning of social avoidance behavior in male mice, and provides a molecular mechanism in shaping trait anxiety.
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Data availability
The RNA sequencing data have been deposited into China National GeneBank Database with the accession number CNP0005854. The other data that support the findings of this study are available from the corresponding author upon reasonable request.
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Funding
This work was supported financially by grants from the National Natural Science Foundation of China (nos. 31871073 and 32171023 to BT; nos. 32271036 and 32471034 to PZ).
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ML contributed to investigation, conducting experiments, acquiring data, analyzing data, reviewing the manuscript, visualization and all the manuscript revision work. KR contributed to conceptualization, experimental design, conducting experiments, acquiring data, analyzing data, writing the manuscript, and visualization. CC, Y-LS, and JL contributed to animal surgeries and in vivo analyses. T-XL and JY contributed to investigation and validation. XP and X-KY contributed to methodology. Y-BY and G-GL contributed to data curation. J-SD and S-TC contributed to behavior tests. PZ and BT contributed to conceptualization, methodology, resources, writing – review & editing, visualization, supervision, project administration, and funding acquisition.
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Li, M., Ren, K., Cui, C. et al. VTA-ACC dopaminergic circuit mediates trait anxiety-related observational learning of social avoidance in male mice. Neuropsychopharmacol. 50, 1364–1375 (2025). https://doi.org/10.1038/s41386-025-02139-7
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DOI: https://doi.org/10.1038/s41386-025-02139-7