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Cytokine Profiles During Carrageenan-Induced Inflammatory Hyperalgesia in Rat Muscle and Hind Paw

Cytokine Profiles During Carrageenan-Induced Inflammatory Hyperalgesia in Rat Muscle and Hind Paw,10.1016/j.jpain.2006.06.010,Journal of Pain,L. C. Lo

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Cytokine Profiles During Carrageenan-Induced Inflammatory Hyperalgesia in Rat Muscle and Hind Paw   (Citations: 36)
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It is not known if a cytokine cascade develops during muscle inflammation and whether cytokines contribute to muscle inflammatory pain. We measured plasma and tissue cytokine concentrations, and behavioral responses to noxious mechanical stimuli, after inducing inflammation in the gastrocnemius muscle and the hind paw of rats. Tissue and plasma samples were taken 3, 6, or 24 h after carrageenan or saline injection into one of the 2 sites. Tumor necrosis factor alpha (TNF-α), interleukin (IL)-1β, IL-6, and cytokine-induced neutrophil chemoattractant 1 (CINC-1) concentrations were measured. Hyperalgesia was present 3 h after carrageenan injection into the hind paw and muscle. The TNF-α was elevated significantly in the inflamed hind paw tissue (P < .001) but not in inflamed muscle tissue. IL-1β was elevated 6 h after carrageenan injection in the hind paw tissue but only 24 h in the muscle tissue (P < .001). The IL-6 was elevated 3 h after injection in the hind paw tissue but only after 6 h in the muscle tissue (P < .01). The CINC-1 in plasma, muscle, and hind paw was elevated from 3 h to 24 h after carrageenan injection (P < .01). The release of IL-1β and IL-6, known to mediate hyperalgesia elsewhere, is delayed in muscle inflammation compared with cutaneous inflammation, whereas TNF-α is not elevated during muscle inflammation.
Journal: Journal of Pain - J PAIN , vol. 8, no. 2, pp. 127-136, 2007
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