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  • Title: TMJ pain in relation to circulating neuropeptide Y, serotonin, and interleukin-1 beta in rheumatoid arthritis.
    Author: Alstergren P, Ernberg M, Kopp S, Lundeberg T, Theodorsson E.
    Journal: J Orofac Pain; 1999; 13(1):49-55. PubMed ID: 10425968.
    Abstract:
    AIMS: The aim of this study was to test the hypothesis that temporomandibular joint (TMJ) pain is influenced by circulating levels of neuropeptide Y, serotonin, and interleukin-1 beta in rheumatoid arthritis. METHODS: Forty-three seropositive (RF+) or seronegative (RF-) rheumatoid arthritis patients and 24 healthy individuals were included in the study. RESULTS: High serum concentrations of serotonin were associated with low TMJ pressure pain thresholds and pain during mandibular movement in the RF+ patients. The results of this study do not support a relationship between circulating neuropeptide Y or interleukin-1 beta and TMJ pain. The RF+ patients had higher C-reactive protein levels and erythrocyte sedimentation rates than the RF- patients. There were also higher plasma levels of interleukin-1 beta in the RF+ patients than in the healthy individuals. Plasma levels of neuropeptide Y in the RF- patients were higher than in the healthy individuals. CONCLUSION: This study indicates that the serum concentration of serotonin is associated with TMJ allodynia in seropositive rheumatoid arthritis.
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