Abstract
Persistent passive coping (p-coping) behaviour is a hallmark feature in major depression and is reversed by fast-acting antidepressants (such as ketamine). This behaviour is regulated by a specific cortico-midbrain circuit. However, the contribution of inhibition in prefrontal cortex to p-coping modulation, and its relevance to chronic stress and/or fast-acting antidepressant effects, are poorly understood. Here, we found that rostral prelimbic cortex (rPL) bidirectionally controls p-coping behaviour where excitatory and inhibitory neurons play opposite roles. Chronic stress leads to a reduced excitation/inhibition (E/I) ratio, reflected as alterations of in vivo spiking rate, synaptic strength, and intrinsic excitability of rPL neurons. A fast-acting antidepressant, (2 R,6 R)-hydroxynorketamine (HNK), reduced p-coping, restored rPL E/I ratio, and partially reversed neuronal changes in chronically stressed mice. Notably, chronic stress and HNK significantly affected fast-spiking/parvalbumin inhibitory neurons which also bidirectionally regulate the passive coping behaviour, highlighting the critical roles of these neurons in the above processes. These findings underscore the importance of rPL E/I balance in regulating p-coping behaviour, which is disrupted by chronic stress and rapidly restored by fast-acting antidepressant.
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Acknowledgements
We thank the members of Zhou’s lab for the technical supports and helpful discussion. This work is supported by grant from Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions (2023SHIBS0004), National Natural Science Foundation of China (82471548), and Wenzhou Basic Scientific Research Project (Y2023064).
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Conceptualization: QZ, THF, and XM. Methodology: QZ, THF, TL, XM, and XC. Experiment and data analysis: THF, TL, and QZ. Writing—original draft: QZ and THF. Writing—review and editing: QZ, THF, and XC. Funding acquisition: QZ and XC. Project administration: QZ. Supervision, QZ.
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Fong, T.H., Li, T., Ma, X. et al. Prefrontal contribution to passive coping behaviour in chronic stress and treatment by fast-acting antidepressant. Neuropsychopharmacol. (2025). https://doi.org/10.1038/s41386-025-02200-5
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DOI: https://doi.org/10.1038/s41386-025-02200-5


