ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2026
Nigra-Subthalamic Dopaminergic Circuitry Modulates and Represents Distinct Pain Modality in Physiological and Pain States in Mice.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Dopaminergic (DA) neurons in the substantia nigra pars compacta (SNc) degenerate in Parkinson's disease (PD). Although pain is a common non-motor symptom in PD, it remains unclear whether and how degeneration of SNc DA neurons contributes to hyperalgesia. In the present study, we revealed a nigro-subthalamic DA circuit, composed of a subset of SNc DA neurons, the SNc DA projection to the subthalamic nucleus (STN), and the downstream STN neurons. These components regulate mechanical, but not thermal, pain threshold on the contralateral side, exhibiting distinct responses to mechanical and thermal stimuli which varied in neuropathic pain and Parkinsonian mice. D2-, but not D1-like, dopamine receptors in the STN were involved in these processes, and their activation mitigated mechanical hyperalgesia in both neuropathic pain and Parkinsonian mice. The GABAergic neurons in the substantia nigra pars reticulata (SNr) responded to pain stimulation and facilitated pain responses in SNc DA neurons. Thus, the SNr
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