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- W2149208570 abstract "Two transglutaminases (TGs), factor XIIIA (FXIIIA) and TG2, undergo physiologic upregulation in growth plate hypertrophic chondrocytes, and pathological upregulation in osteoarthritic cartilage. Externalization of guanine-nucleotide-bound TG2 drives chondrocyte maturation to hypertrophy, a state linked to matrix remodeling and calcification. Here, we tested the hypothesis that FXIIIA also promotes hypertrophic differentiation. Using human articular chondrocytes, we determined that extracellular FXIIIA induced chondrocyte hypertrophy associated with rapid movement of TG2 to the cell surface. Site-directed mutagenesis revealed that FXIIIA Pro37 bordering the thrombin endoproteolytic Arg38-Gly39 site, but not intrinsic TG catalytic activity, were necessary for FXIIIA to induce chondrocyte hypertrophy. TGs have been demonstrated to interact with certain integrins and, during osteoarthritis (OA), α1β1 integrin is upregulated and associated with hypertrophic chondrocytes. FXIIIA engaged α1β1 integrin in chondrocytes. Antibody crosslinking of α1β1 integrin mobilized TG2. Conversely, an α1β1-integrin-specific blocking antibody inhibited the capacity of FXIIIA to induce TG2 mobilization to the cell surface, phosphorylation of p38 MAP kinase, and chondrocyte hypertrophy. Our results identify a unique functional network between two cartilage TG isoenzymes that accelerates chondrocyte maturation without requirement for TG-catalyzed transamidation by either TG." @default.
- W2149208570 created "2016-06-24" @default.
- W2149208570 creator A5030928268 @default.
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- W2149208570 date "2008-07-01" @default.
- W2149208570 modified "2023-09-26" @default.
- W2149208570 title "Factor XIIIA mobilizes transglutaminase 2 to induce chondrocyte hypertrophic differentiation" @default.
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- W2149208570 doi "https://doi.org/10.1242/jcs.011262" @default.
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