Abstract
Social avoidance is highly detrimental for natural behavior. Despite much research on this topic, the mechanisms underlying the development of social avoidance as a consequence of social-related traumatic experiences remain highly elusive. To investigate this issue, we adapted a mouse model of social threat conditioning in which mice received shock punishment during exploration of an unfamiliar conspecific. This resulted in prominent and lasting reductions in social behavior, effects that were not observed in mice that received shock punishment in the absence of a social stimulus. Furthermore, the effects of social threat conditioning were independent of contextual settings, sex variables, and particular identity of the unfamiliar conspecifics that predicted shock punishment. Shedding new light into the neurobiological bases for this phenomenon, we found that optogenetic silencing of the prelimbic (PL), but not infralimbic (IL), prefrontal cortex during social threat conditioning produced profound forgetting and restoration of social behavior during subsequent sociability tests. Significant forgetting and recovery of social behavior was also observed with prelimbic inhibition of NMDARs. Collectively, these findings are consistent with the notion that social-related trauma is a prominent risk factor for social avoidance, and that traumatic experiences that involve social elements engage learning-related mechanisms in corticolimbic networks to promote long-term representations of social threat.

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Acknowledgements
The authors thank Shatavia McBride and Hope Msengi for technical assistance. The authors would also like to thank Dr. Isabel Muzzio, Dr. Todd Troyer, and Dr. Edwin Barea-Rodriguez for sharing equipment, Dr. Alfonso Apicella for sharing supplies and for general feedback on the project, and Dr. Maria Diehl for comments on an earlier version of the manuscript.
Funding
KLO, ACFO, JMT, CG, KRW, AEK, ARR, SAV, ANM, and ABR were supported by the Baptist Health Foundation, UTSAÂ NDRB Seed Grant Program, UTSA College of Sciences, UT-STAR Program, and NIH grants R25EB027605 and T34GM145507. JRR was supported by the North Carolina TraCS Institute, Foundation of Hope, Brain and Behavior Research Foundation, Kavli Foundation, Whitehall Foundation, and NIH grant R01MH132073.
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Conceptualization: ABR and JRR. Research design: ABR, KLO, and JRR. Validation of methods: ABR, KLO, and ACFO. Animal behavior: KLO, ACFO, JMT, CG, KRW, AEK, ARR, SAV, and ANM. Optogenetics: KLO, ACFO, AEK, and ARR. Drug experiment: ABR., KLO, and ARR. Data analysis: ABR, KLO, and ACFO. Histology: KLO, JMT, CG, KRW, ARR, and ANM. Article preparation: ABR, KLO, and JRR. Project supervision: ABR.
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Lozano-Ortiz, K., Felix-Ortiz, A.C., Terrell, J.M. et al. The prelimbic prefrontal cortex mediates the development of lasting social avoidance as a consequence of social threat conditioning. Neuropsychopharmacol. 50, 1875–1884 (2025). https://doi.org/10.1038/s41386-025-02073-8
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DOI: https://doi.org/10.1038/s41386-025-02073-8


