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Melanocortin-4 receptor expression in the rostral ventromedial medulla involved in modulation of nociception in transgenic mice

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单位: [1]Med Assoc Hubei Prov, Wuhan 430060, Peoples R China [2]Huazhong Univ Sci & Technol, Tongji Hosp, Dept Anesthesiol & Pain Med, Tongji Med Coll, Wuhan 430030, Peoples R China [3]Guangdong Prov Hosp Tradit Chinese Med, Dept Dermatol, Guangzhou 510120, Guangdong, Peoples R China
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关键词: melanocortin-4 receptor nociception rostral ventromedial medulla

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The rostral ventromedial medulla (RVM) is a prominent component of the descending modulatory system involved in the control of spinal nociceptive transmission. In the current study, we investigated melanocortin-4 receptor (MC4R) expression in the RVM, where the neurons involved in modulation of nociception reside. Using a line of mice expressing green fluorescent protein (GFP) under the control of the MC4R promoter, we found a large number of GFP-positive neurons in the RVM [nucleus raphe magnus (NRM) and nucleus gigantocellularis pars alpha (NGC alpha)]. Fluorescence immunohistochemistry revealed that approximately 10% of MC4R-GFP-positive neurons coexpressed tyrosine hydroxylase, indicating that they were catecholaminergic, whereas 50%-75% of those coexpressed tryptophan hydroxylase, indicating that they were serotonergic. Our findings support the hypothesis that MC4R signaling in RVM may modulate the activity of serotonergic sympathetic outflow sensitive to nociceptive signals, and that MC4R signaling in RVM may contribute to the descending modulation of nociceptive transmission.

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出版当年[2012]版:
大类 | 4 区 医学
小类 | 4 区 生化与分子生物学
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Q4 BIOCHEMISTRY & MOLECULAR BIOLOGY
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第一作者单位: [1]Med Assoc Hubei Prov, Wuhan 430060, Peoples R China
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