Premium
Participation of peripheral tachykinin NK 1 receptors in the carrageenan‐induced inflammation of the rat temporomandibular joint
Author(s) -
DenadaiSouza Alexandre,
Camargo Livia de Lucca,
Ribela Maria T.C.P.,
Keeble Julie E.,
Costa Soraia K.P.,
Muscará Marcelo N.
Publication year - 2009
Publication title -
european journal of pain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.305
H-Index - 109
eISSN - 1532-2149
pISSN - 1090-3801
DOI - 10.1016/j.ejpain.2008.09.012
Subject(s) - extravasation , temporomandibular joint , inflammation , medicine , peripheral , receptor , nociceptor , carrageenan , allodynia , tumor necrosis factor alpha , nociception , endocrinology , anesthesia , pathology , pharmacology , hyperalgesia
Temporomandibular disorders represent one of the major challenges in dentistry therapeutics. This study was undertaken to evaluate the time course of carrageenan‐induced inflammation in the rat temporomandibular joint (TMJ) and to investigate the role of tachykinin NK 1 receptors. Inflammation was induced by a single intra‐articular (i.art.) injection of carrageenan into the left TMJ (control group received sterile saline). Inflammatory parameters such as plasma extravasation, leukocyte influx and mechanical allodynia (measured as the head‐withdrawal force threshold) and TNFα and IL‐1β concentrations were measured in the TMJ lavages at selected time‐points. The carrageenan‐induced responses were also evaluated after treatment with the NK 1 receptor antagonist SR140333. The i.art. injection of carrageenan into the TMJ caused a time‐dependent plasma extravasation associated with mechanical allodynia, and a marked neutrophil accumulation between 4 and 24h. Treatment with SR140333 substantially inhibited the increase in plasma extravasation and leukocyte influx at 4 and 24h, as well as the production of TNFα and IL‐1β into the joint cavity, but failed to affect changes in head‐withdrawal threshold. The results obtained from the present TMJ‐arthritis model provide, for the first time, information regarding the time course of this experimental inflammatory process. In addition, our data show that peripheral NK 1 receptors mediate the production of both TNFα and IL‐1β in the TMJ as well as some of the inflammatory signs, such as plasma extravasation and leukocyte influx, but not the nociceptive component.