title: Relationship of calcitonin gene-related peptide in synovial tissues and temporomandibular joint pain in humans.
abstract: OBJECTIVE
  To elucidate the expression of calcitonin gene-related peptide (CGRP) in synovial tissue taken from the human temporomandibular joint (TMJ) with internal derangement, and discuss the relationship between CGRP and joint pain.
  
  
  METHODS
  Using an immunohistochemical technique, 48 joints in 48 patients were examined. As controls, synovial tissue specimens from 7 joints with habitual dislocation without pain were also examined.
  
  
  RESULTS
  In all of the internal derangement and control subjects, CGRP-positive cells were observed in the connective tissues around the blood vessels beneath the lining cells. The extent score of CGRP was significantly higher in the internal derangement group than in the control group (P=.033). There was a significant positive correlation between the extent score of CGRP and joint pain (P=.036, r=0.30).
  
  
  CONCLUSIONS
  These results suggest that the expression of CGRP is increased in the synovial tissues from patients with internal derangement, and that CGRP seems to play an important role in the mechanism of pain production in patients with symptomatic internal derangement.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Kanazawa Medical University, Daigaku, Uchinada, Ishikawa, Japan. jun-s@kanazawa-med.ac.jp
authors.forename: Jun
authors.initials: J
authors.lastname: Sato
authors.forename: Natsuki
authors.initials: N
authors.lastname: Segami
authors.forename: Keiseki
authors.initials: K
authors.lastname: Kaneyama
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yoshimura
authors.forename: Kazuma
authors.initials: K
authors.lastname: Fujimura
authors.forename: Yoshino
authors.initials: Y
authors.lastname: Yoshitake
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D018771:Arthralgia / Q000473:pathology; D001182:Arthroscopy; D015740:Calcitonin Gene-Related Peptide / Q000032:analysis*; D003238:Connective Tissue / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D004204:Joint Dislocations / Q000473:pathology*; D008297:Male; D008833:Microcirculation / Q000473:pathology; D008875:Middle Aged; D018709:Statistics, Nonparametric; D013583:Synovial Membrane / Q000098:blood supply / Q000473:pathology*; D013585:Synovitis / Q000473:pathology; D013705:Temporomandibular Joint Disorders / Q000473:pathology*
chemical_list: D015740:Calcitonin Gene-Related Peptide