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0This research examines how dopamine pathways connecting the ventral tegmental area (VTA) and the orbitofrontal cortex (OFC) regulate chronic pain and associated emotional disorders. Using a mouse model of trigeminal neuralgia, the authors identified a hypodopaminergic state that drives both physical sensitivity and depressive behaviors. The study reveals that two distinct dopamine receptors in the OFC serve as independent functional gates: D1 receptors manage anxiety and depression, while D2 receptors control pain relief. Specifically, the OFC-LDTg circuit was found to mediate emotional stability, whereas the OFC-BLA circuit specifically modulates physical pain thresholds. These findings suggest that targeting receptor-specific pathways within the mesocortical system could lead to more precise treatments for patients suffering from comorbid pain and mental health conditions. By distinguishing the neural hardware of sensory versus affective symptoms, the researchers provide a roadmap for optimizing dopaminergic interventions beyond traditional analgesics.
References:
Cai Y Q, Hou X Y, Wang G H, et al. Receptor and cell-type-specific mechanisms in mesocortical dopamine circuits gate chronic pain and comorbid anxiodepression[J]. Neuron, 2026.
