Abstract
Both peripheral and central corticotropin-releasing factor (CRF) systems have been implicated in regulating pain sensation. However, compared with the peripheral, the mechanisms underlying central CRF system in pain modulation have not yet been elucidated, especially at the neural circuit level. The corticoaccumbal circuit, a structure rich in CRF receptors and CRF-positive neurons, plays an important role in behavioral responses to stressors including nociceptive stimuli. The present study was designed to investigate whether and how CRF signaling in this circuit regulated pain sensation under physiological and pathological pain conditions. Our studies employed the viral tracing and circuit-, and cell-specific electrophysiological methods to label the CRF-containing circuit from the medial prefrontal cortex to the nucleus accumbens shell (mPFCCRF-NAcS) and record its neuronal propriety. Combining optogenetic and chemogenetic manipulation, neuropharmacological methods, and behavioral tests, we were able to precisely manipulate this circuit and depict its role in regulation of pain sensation. The current study found that the CRF signaling in the NAc shell (NAcS), but not NAc core, was necessary and sufficient for the regulation of pain sensation under physiological and pathological pain conditions. This process was involved in the CRF-mediated enhancement of excitatory synaptic transmission in the NAcS. Furthermore, we demonstrated that the mPFCCRF neurons monosynaptically connected with the NAcS neurons. Chronic pain increased the protein level of CRF in NAcS, and then maintained the persistent NAcS neuronal hyperactivity through enhancement of this monosynaptic excitatory connection, and thus sustained chronic pain behavior. These findings reveal a novel cell- and circuit-based mechanistic link between chronic pain and the mPFCCRF → NAcS circuit and provide a potential new therapeutic target for chronic pain.
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Acknowledgements
We would like to thank Li Yang, Dong-Yu Zhou, Wei Zheng and Prof. Cheng Xiao for technical supports. The present study was supported by the National Key R&D Program of China—the Sci-Tech Innovation 2030 Major Project (2021ZD0203100), the National Natural Science Foundation of China (82130033, 82293641, 31970937, 82271255, 82101315 and 82271263); Jiangsu Province Innovative and Entrepreneurial Team Program, the Key Project of Nature Science Foundation of Jiangsu Education Department (22KJA320006); the Innovation and Entrepreneurship Program of Xuzhou Medical University (2021CXFUZX002), China Postdoctoral Science Foundation (2022M710771 and 2022M722676), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX21_2704); the Yangfan Plan of Shanghai Science and Technology Commission (No. 22YF1439600); the China Postdoctoral Science Foundation (No. 2022M710771); the National Natural Science Foundation of China (No. 82201372).
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W.Z., Y.-M.Y., X.-Y.W., S.-H.X., Y.M., H.T., M.T., H.L., Z.X., H.Z., J.-L.C., and H.-L.D. initiated and designed the research. W.Z., S.-H.X., and J.-L.C. wrote the manuscript. W.Z., X.-Y.W., Y.M., Y.-M.Y., H.T., M.T., H.L., P.W. and J.-X.Y. performed all experiments and analyzed and interpreted the results. All the authors approved the submission.
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Zhao, W., Yu, YM., Wang, XY. et al. CRF regulates pain sensation by enhancement of corticoaccumbal excitatory synaptic transmission. Mol Psychiatry (2024). https://doi.org/10.1038/s41380-024-02488-7
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DOI: https://doi.org/10.1038/s41380-024-02488-7