Similarly to humans, healthy, wild-type mice develop osteoarthritis, including of the temporomandibular joint (TMJ), as a result of aging. Pro-inflammatory cytokines, such as IL-1β, IL-6, and TNFα, are known to contribute to the development of osteoarthritis, whereas TGFβ has been associated with articular regeneration. We hypothesized that a balance between IL-1β and TGFβ underlies the development of TMJ osteoarthritis, whereby IL-1β signaling down-regulates TGFβ expression as part of disease pathology. Our studies in wild-type mice, as well as the Col1-IL1βXAT mouse model of osteoarthritis, demonstrated an inverse correlation between IL-1β and TGFβ expression in the TMJ. IL-1β etiologically correlated with joint pathology, whereas TGFβ expression associated with IL-1β down-regulation and improvement of articular pathology. Better understanding of the underlying inflammatory processes during disease will potentially enable us to harness inflammation for orofacial tissue regeneration.
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