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- W3126363393 abstract "We aimed to identify the immunoregulatory role of the cyclin-dependent kinase inhibitor p21 in the homeostasis of mandibular condylar cartilage affected by mechanical stress.Ten C57BL/6 wild-type (WT) and ten p21-/- mice aged 8 weeks were divided into the untreated and treated groups. In the treated groups, mechanical stress was applied to the temporomandibular joint (TMJ) through forced mouth opening for 3 hr/day for 7 days. The dissected TMJs were assessed using micro-CT, histology, and immunohistochemistry.Treated p21-/- condyles with mechanical stress revealed more severe subchondral bone destruction, with thinner cartilage layers and smaller proteoglycan area relative to treated WT condyles; untreated WT and p21-/- condyles had smoother surfaces. Immunohistochemistry revealed significant increases in the numbers of caspase-3, interleukin-1β, matrix metalloprotease (MMP)-9, and MMP-13 positive cells, and few aggrecan positive cells, in treated p21-/- than in treated WT samples. Moreover, the number of TUNEL positive cells markedly increased in p21-/- condyles affected by mechanical stress.Our findings indicate that p21 in chondrocytes contributes to regulate matrix synthesis via the control ofm aggrecan and MMP-13 expression under mechanical stress. Thus, p21 might regulate the pathogenesis of osteoarthritis in the TMJ." @default.
- W3126363393 created "2021-02-15" @default.
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- W3126363393 date "2021-02-10" @default.
- W3126363393 modified "2023-10-18" @default.
- W3126363393 title "The immunoregulatory role of p21 in the development of the temporomandibular joint‐osteoarthritis" @default.
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- W3126363393 doi "https://doi.org/10.1002/cre2.404" @default.
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