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2008:
Oh Hwanhee; Yang Siyoung; Park Meeyoung; Chun Jang-Soo
Matrix metalloproteinase (MMP)-12 regulates MMP-9 expression in interleukin-1beta-treated articular chondrocytes.
Journal of cellular biochemistry 2008;
105(
6):.
Limited information is available on the expression and role of matrix metalloproteinase (MMP)-12 in chondrocytes. We characterized the expression mechanism of MMP-12 and possible function in chondrocytes. Interleukin (IL)-1beta induced the expression and activation of MMP-12 in primary culture chondrocytes and cartilage explants via mitogen-activated protein (MAP) kinase signaling pathways. Among MAP kinases, extracellular signal-regulated kinase and p38 kinase are necessary for MMP-12 expression, whereas c-jun N-terminal kinase is required for the activation of MMP-12. The possibility that MMP-12 acts as a modulator of other MMP was examined. MMP-12 alone did not affect other MMP expressions. However, MMP-12 enhanced expression and activation of MMP-9 in the presence of IL-1beta. Our results indicate that IL-1beta in chondrocytes induces the expression and activation of MMP-12, which, in turn, augments MMP-9 expression and activation.
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