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

  • Xu-chu Pan (潘旭初)
  • Yong-tang Song (宋咏堂)
  • Cheng Liu (刘 成)
  • Hong-bing Xiang (项红兵)
  • Chuan-jian Lu (卢传坚)
Article

Summary

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 α (NGCα)]. 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.

Key words

melanocortin-4 receptor nociception rostral ventromedial medulla 

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Copyright information

© Huazhong University of Science and Technology and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Xu-chu Pan (潘旭初)
    • 1
  • Yong-tang Song (宋咏堂)
    • 1
  • Cheng Liu (刘 成)
    • 2
  • Hong-bing Xiang (项红兵)
    • 2
  • Chuan-jian Lu (卢传坚)
    • 3
  1. 1.Medical Association of Hubei ProvinceWuhanChina
  2. 2.Department of Anesthesiology and Pain Medicine, Tongji Hospital, Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina
  3. 3.Department of DermatologyGuangdong Provincial Hospital of Traditional Chinese MedicineGuangzhouChina

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