Abstract
Background
Osteoarthritis arising from cartilage degeneration is the most common cause of joint pain. However, the relationship between joint pain and cartilage degeneration is not well understood.
Questions/Purposes
We asked whether the inflammatory mediators participate in the joint pain in the presence of cartilage degeneration.
Methods
We observed electromyographic responses of hindlimb flexors to four inflammatory mediators (bradykinin, ATP, acetylcholine, and serotonin) injected in normal rat knees and in those with monosodium iodoacetate (MIA)-induced arthritis.
Results
Joint cartilage of all the rats with MIA-induced arthritis histologically showed severe degeneration. We observed greater magnitude and longer duration responses in the MIA-induced arthritis than normal joints with all four mediators.
Conclusions
The data suggested nociceptors in osteoarthritic joints are more sensitive to inflammatory mediators than in normal joints. Such nociceptive sensitization to inflammatory mediators may participate in the joint pain in osteoarthritis.
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Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
Each author certifies that his or her institution approved the animal protocol for this investigation and that all investigations were conducted in conformity with ethical principles of research.
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Okamoto, M., Atsuta, Y. Cartilage Degeneration is Associated with Augmented Chemically-induced Joint Pain in Rats: A Pilot Study. Clin Orthop Relat Res 468, 1423–1427 (2010). https://doi.org/10.1007/s11999-009-1193-z
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DOI: https://doi.org/10.1007/s11999-009-1193-z