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Evidence for the involvement of endogenous ATP and P2X receptors in TMJ pain.

Abstract
Evidence is accumulating which supports a role for ATP in the initiation of pain by acting on P2X receptors expressed on nociceptive afferent nerve terminals. To investigate whether these receptors play a role in temporomandibular (TMJ) pain, we studied the presence of functional P2X receptors in rat TMJ by examining the nociceptive behavioral response to the application of the selective P2X receptor agonist alpha,beta-methylene ATP (alpha,beta-meATP) into the TMJ region of rat. The involvement of endogenous ATP in the development of TMJ inflammatory hyperalgesia was also determined by evaluating the effect of the general P2 receptor antagonist pyridoxal-phosphate-6-azophenyl-2',4'-disulphonic acid (PPADS) on carrageenan-induced TMJ inflammatory hyperalgesia. Application of alpha,beta-meATP into the TMJ region of rats produced significant nociceptive responses that were significantly reduced by the co-application of lidocaine N-ethyl bromide quaternary salt, QX-314, (2%) or of the P2 receptor antagonist PPADS. Co-application of PPADS with carrageenan into the TMJ significantly reduced inflammatory hyperalgesia. The results indicate that functional P2X receptors are present in the TMJ and suggest that endogenous ATP may play a role in TMJ inflammatory pain mechanisms possibly by acting primarily in these receptors.
AuthorsMaria Cláudia G Oliveira, Carlos Amílcar Parada, Maria Cecília Ferraz Arruda Veiga, Luciane Rocha Rodrigues, Silvana Pereira Barros, Cláudia Herrera Tambeli
JournalEuropean journal of pain (London, England) (Eur J Pain) Vol. 9 Issue 1 Pg. 87-93 (Feb 2005) ISSN: 1090-3801 [Print] England
PMID15629879 (Publication Type: Journal Article)
Chemical References
  • Anti-Inflammatory Agents
  • Purinergic P2 Receptor Agonists
  • Purinergic P2 Receptor Antagonists
  • Receptors, Purinergic P2
  • Receptors, Purinergic P2X
  • pyridoxal phosphate-6-azophenyl-2',4'-disulfonic acid
  • QX-314
  • Pyridoxal Phosphate
  • Adenosine Triphosphate
  • Carrageenan
  • Lidocaine
  • alpha,beta-methyleneadenosine 5'-triphosphate
Topics
  • Adenosine Triphosphate (analogs & derivatives, metabolism, pharmacology)
  • Animals
  • Anti-Inflammatory Agents (pharmacology)
  • Arthralgia (metabolism, physiopathology)
  • Arthritis (chemically induced, metabolism, physiopathology)
  • Carrageenan (antagonists & inhibitors)
  • Disease Models, Animal
  • Down-Regulation (drug effects, physiology)
  • Lidocaine (analogs & derivatives, pharmacology)
  • Male
  • Nociceptors (drug effects, metabolism)
  • Purinergic P2 Receptor Agonists
  • Purinergic P2 Receptor Antagonists
  • Pyridoxal Phosphate (analogs & derivatives, pharmacology)
  • Rats
  • Rats, Wistar
  • Receptors, Purinergic P2 (metabolism)
  • Receptors, Purinergic P2X
  • Sensory Receptor Cells (metabolism, physiopathology)
  • Temporomandibular Joint (innervation, physiopathology)
  • Temporomandibular Joint Disorders (chemically induced, metabolism, physiopathology)

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