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As melanocortins promote nerve regeneration after axonal injury, we investigated whether MC4R functions as a key receptor for peripheral nerve regeneration. <jats:italic>In situ<\/jats:italic> hybridization revealed that MC4R mRNA is induced in mouse hypoglossal motor neurons after axonal injury, whereas mRNAs for MC1R, MC2R, MC3R, and MC5R are not expressed either before or after nerve injury. This result was confirmed by RT\u2010PCR. The level of MC4R mRNA expression increased significantly from day 3 after axotomy, reached a peak on day 5, and decreased to the control level on day 14. Similar induction of MC4R was observed in axotomized mouse dorsal root ganglia (DRGs). MC4R mRNA expression was induced exclusively among the MCR family in the L4\u20106 DRG after sciatic nerve injury. We further examined whether alpha\u2010melanocortin stimulating hormone (alpha\u2010MSH) promotes neurite elongation via MC4R. In mouse DRG neuron culture, alpha\u2010MSH significantly promoted neurite outgrowth at a concentration of 10<jats:sup>\u22128<\/jats:sup>\u2003mol\/L. This neurite\u2010elongation effect was entirely inhibited by the addition of a selective MC4R blocker, JKC\u2010363. Therefore, it is concluded that alpha\u2010MSH could stimulate neurite elongation via MC4R in DRG neurons. The present results suggest that induction of MC4R is crucial for motor and sensory neurons to regenerate after axonal injury.<\/jats:p>","DOI":"10.1111\/j.1471-4159.2006.04432.x","type":"journal-article","created":{"date-parts":[[2007,2,5]],"date-time":"2007-02-05T12:43:30Z","timestamp":1170679410000},"page":"1145-1152","source":"Crossref","is-referenced-by-count":21,"title":["Melanocortin receptor 4 is induced in nerve\u2010injured motor and sensory neurons of mouse"],"prefix":"10.1111","volume":"101","author":[{"given":"Katsuhisa","family":"Tanabe","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazushige","family":"Gamo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shunsuke","family":"Aoki","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keiji","family":"Wada","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroshi","family":"Kiyama","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2007,1,9]]},"reference":[{"key":"e_1_2_7_2_1","first-page":"1182","article-title":"Differential effects of melanocortin peptides on neural melanocortin receptors","volume":"46","author":"Adan R. 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