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Singh, Purva; Marcu, Kenneth B.; Goldring, Mary B.; Otero, Miguel
Annals of the New York Academy of Sciences, April 2019, 2019-04-00, 20190401, Volume: 1442, Issue: 1Journal Article
Articular chondrocytes are quiescent, fully differentiated cells responsible for the homeostasis of adult articular cartilage by maintaining cellular survival functions and the fine‐tuned balance between anabolic and catabolic functions. This balance requires phenotypic stability that is lost in osteoarthritis (OA), a disease that affects and involves all joint tissues and especially impacts articular cartilage structural integrity. In OA, articular chondrocytes respond to the accumulation of injurious biochemical and biomechanical insults by shifting toward a degradative and hypertrophy‐like state, involving abnormal matrix production and increased aggrecanase and collagenase activities. Hypertrophy is a necessary, transient developmental stage in growth plate chondrocytes that culminates in bone formation; in OA, however, chondrocyte hypertrophy is catastrophic and it is believed to initiate and perpetuate a cascade of events that ultimately result in permanent cartilage damage. Emphasizing changes in DNA methylation status and alterations in NF‐κB signaling in OA, this review summarizes the data from the literature highlighting the loss of phenotypic stability and the hypertrophic differentiation of OA chondrocytes as central contributing factors to OA pathogenesis. Articular chondrocytes are quiescent, fully differentiated cells responsible for the homeostasis of adult articular cartilage. In osteoarthritis (OA), these cells respond to accumulated biochemical and biomechanical insults by shifting towards a degradative and hypertrophy‐like state. This review summarizes the data from the literature highlighting the loss of phenotypic stability and the hypertrophic differentiation of OA chondrocytes, emphasizing changes in DNA methylation status and alterations in NF‐κB signaling in OA.
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