title: The role of peripheral N-methyl-D-aspartate receptors in muscle hyperalgesia.
abstract: The present study demonstrates that intramuscular administration of N-methyl-D-aspartate receptor antagonist AP5 dose-dependently attenuates complete Freund's adjuvant (CFA) induced muscular hyperalgesia. CFA significantly reduced mean bite force and success rate in the rats trained to produce a specific bite force. Pretreatment with AP5 reversed the overall magnitude of reduction in mean bite force and success rate in CFA inflamed rats, and significantly facilitated the recovery of these measures to pre-injection level. AP5 treatment 1 day after the CFA injection had little effect on CFA-mediated changes in bite force measurements. These data suggest that peripheral N-methyl-D-aspartate receptors play a critical role in the development of persistent muscle hyperalgesia, and provide important new insights for therapeutic alternatives that can be directed at the periphery.
authors.affiliation: Department of Biomedical Sciences, University of Maryland Baltimore School of Dentistry, Baltimore, MD 21201, USA. jyr001@dental.umaryland.edu
authors.forename: Jin Y
authors.initials: JY
authors.lastname: Ro
authors.forename: Michael
authors.initials: M
authors.lastname: Nies
authors.forename: Youping
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D015763:2-Amino-5-phosphonovalerate / Q000494:pharmacology; D000818:Animals; D001732:Bite Force; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D018691:Excitatory Amino Acid Antagonists / Q000494:pharmacology; D005620:Freund's Adjuvant; D006930:Hyperalgesia / Q000139:chemically induced / Q000188:drug therapy / Q000503:physiopathology*; D008297:Male; D009132:Muscles / Q000187:drug effects / Q000503:physiopathology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D016194:Receptors, N-Methyl-D-Aspartate / Q000502:physiology*; D013997:Time Factors
chemical_list: D018691:Excitatory Amino Acid Antagonists; D016194:Receptors, N-Methyl-D-Aspartate; D015763:2-Amino-5-phosphonovalerate; D005620:Freund's Adjuvant