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Journal Article
Research Support, Non-U.S. Gov't
Oncostatin M regulates osteogenic differentiation of murine adipose-derived mesenchymal progenitor cells through a PKCdelta-dependent mechanism.
Cell and Tissue Research 2015 May
Oncostatin M (OSM) is an IL-6/LIF family cytokine that influences mesenchymal progenitor differentiation; however, the mechanisms of this activity have not been fully elucidated. Using uncommitted murine adipose tissue-derived mesenchymal progenitors, we have examined mechanisms of OSM-induced osteogenesis. Murine OSM (mOSM) induced osteogenic differentiation to a greater degree than interleukin (IL)-6 and other members of the gp130 cytokine family, promoting extracellular matrix mineralization as indicated by Alizarin Red S staining. mOSM also increased expression of osteogenesis-associated gene products BMP4, BMP7, Runx-2, and osteocalcin as assessed by immunoblotting and real-time quantitative PCR. Additionally, protein kinase C (PKC) delta activity was upregulated in response to OSM stimulation, and to a greater degree than IL-6. Knockdown of PKCdelta expression by use of RNA interference (RNAi) reduced OSM-mediated osteogenic differentiation and decreased expression of Runx-2. These findings suggest that OSM differentially promotes osteogenesis in non-committed mesenchymal progenitors relative to other gp130 cytokines. This activity correlates with selective activation of PKCdelta in OSM-treated cells, indicating that OSM-induced osteogenesis and upregulation of osteogenic gene products require activity of PKCdelta.
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