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• W2110266849 endingPage "23792" @default.
• W2110266849 startingPage "23780" @default.
• W2110266849 abstract "The lack of beta1 integrins on chondrocytes leads to severe chondrodysplasia associated with high mortality rate around birth. To assess the impact of beta1 integrin-mediated cell-matrix interactions on the function of adult knee joints, we conditionally deleted the beta1 integrin gene in early limb mesenchyme using the Prx1-cre transgene. Mutant mice developed short limbed dwarfism and had joint defects due to beta1 integrin deficiency in articular regions. The articular cartilage (AC) was structurally disorganized, accompanied by accelerated terminal differentiation, altered shape, and disrupted actin cytoskeleton of the chondrocytes. Defects in chondrocyte proliferation, cytokinesis, and survival resulted in hypocellularity. However, no significant differences in cartilage erosion, in the expression of matrix-degrading proteases, or in the exposure of aggrecan and collagen II cleavage neoepitopes were observed between control and mutant AC. We found no evidence for disturbed activation of MAPKs (ERK1/2, p38, and JNK) in vivo. Furthermore, fibronectin fragment-stimulated ERK activation and MMP-13 expression were indistinguishable in control and mutant femoral head explants. The mutant synovium was hyperplastic and frequently underwent chondrogenic differentiation. beta1-null synoviocytes showed increased proliferation and phospho-focal adhesion kinase expression. Taken together, deletion of beta1 integrins in the limb bud results in multiple abnormalities of the knee joints; however, it does not accelerate AC destruction, perturb cartilage metabolism, or influence intracellular MAPK signaling pathways." @default.
• W2110266849 created "2016-06-24" @default.
• W2110266849 creator A5023983987 @default.
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• W2110266849 creator A5026111008 @default.
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• W2110266849 date "2009-08-01" @default.
• W2110266849 modified "2023-10-10" @default.
• W2110266849 title "β1 Integrin Deficiency Results in Multiple Abnormalities of the Knee Joint" @default.
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• W2110266849 doi "https://doi.org/10.1074/jbc.m109.039347" @default.
• W2110266849 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2749151" @default.
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