Abstract
Chronic pain conditions within clinical populations are correlated with a high incidence of depression, and researchers have reported their high rate of comorbidity. Clinically, chronic pain worsens the prevalence of depression, and depression increases the risk of chronic pain. Individuals suffering from chronic pain and depression respond poorly to available medications, and the mechanisms underlying the comorbidity of chronic pain and depression remain unknown. We used spinal nerve ligation (SNL) in a mouse model to induce comorbid pain and depression. We combined behavioral tests, electrophysiological recordings, pharmacological manipulation, and chemogenetic approaches to investigate the neurocircuitry mechanisms of comorbid pain and depression. SNL elicited tactile hypersensitivity and depression-like behavior, accompanied by increased and decreased glutamatergic transmission in dorsal horn neurons and midbrain ventrolateral periaqueductal gray (vlPAG) neurons, respectively. Intrathecal injection of lidocaine, a sodium channel blocker, and gabapentin ameliorated SNL-induced tactile hypersensitivity and neuroplastic changes in the dorsal horn but not depression-like behavior and neuroplastic alterations in the vlPAG. Pharmacological lesion of vlPAG glutamatergic neurons induced tactile hypersensitivity and depression-like behavior. Chemogenetic activation of the vlPAG-rostral ventromedial medulla (RVM) pathway ameliorated SNL-induced tactile hypersensitivity but not SNL-elicited depression-like behavior. However, chemogenetic activation of the vlPAG-ventral tegmental area (VTA) pathway alleviated SNL-produced depression-like behavior but not SNL-induced tactile hypersensitivity. Our study demonstrated that the underlying mechanisms of comorbidity in which the vlPAG acts as a gating hub for transferring pain to depression. Tactile hypersensitivity could be attributed to dysfunction of the vlPAG-RVM pathway, while impairment of the vlPAG-VTA pathway contributed to depression-like behavior.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgements
We would like to acknowledge the technical support by the Basic Medical Core Laboratory, I-Shou University College of Medicine. The authors would like to thank SATU Joint Research Scheme organized by Presidents’ Forum of Southeast Asia and Taiwan Universities (SATU) for the collaborative enhancement.
Funding
This work was supported by the Ministry of Science and Technology, Taipei, Taiwan (MOST 110–2511-H-002–020-MY3 to W.-H.P.; MOST 110–2320-B-214–002 to H.-W.K.; MOST 109–2320-B-214–001 and MOST 111–2628-B-214 -001 -MY3 to C.-C.W; MOST 108–2320-B-214–011-MY3 and MOST 111–2320-B-214 -002 -MY3 to Y.-C.H.), Fundamental Research Grant Scheme, Ministry of Higher Education, Malaysia (FRGS/1/2021/SKK06/UCSI/02/4 and FRGS/1/2021/WAB13/UCSI/02/1 to M.T.L.) and UCSI University Research Excellence and Innovation Grant, Malaysia (REIG-FPS-2020/065 to M.T.L.).
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MTL, WHP, and YCH designed the studies, performed experiments, analyzed data, and wrote the draft manuscript. CCW and HWK conducted some behavioral experiments. DWW and YNT were involved in the revision of the final manuscript. YCH conceptualized, supervised the project, and prepared the manuscript with the help of all authors.
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All animal experiments were approved by the Institutional Animal Care and Use Committee of College of Medicine, I-Shou University following ARRIVE guidelines.
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Lee, M.T., Peng, WH., Wu, CC. et al. Impaired Ventrolateral Periaqueductal Gray-Ventral Tegmental area Pathway Contributes to Chronic Pain-Induced Depression-Like Behavior in Mice. Mol Neurobiol 60, 5708–5724 (2023). https://doi.org/10.1007/s12035-023-03439-z
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DOI: https://doi.org/10.1007/s12035-023-03439-z