title: Oncostatin M promotes osteogenesis and suppresses adipogenic differentiation of human adipose tissue-derived mesenchymal stem cells.
abstract: Oncostatin M (OSM) is a multifunctional cytokine of the interleukin-6 family and has been implicated in embryonic development, differentiation, inflammation, and regeneration of liver and bone. In the present study, we demonstrated that treatment of human adipose mesenchymal stem cells (hADSCs) with OSM-attenuated adipogenic differentiation, as indicated by decreased accumulation of intracellular lipid droplets and down-regulated expression of adipocytic markers, such as lipoprotein lipase and PPARgamma. However, OSM treatment stimulated osteogenic differentiation, as demonstrated by the increase in matrix mineralization and expression levels of osteogenic differentiation markers, including alkaline phosphatase, Runx2, and osteocalcin. OSM treatment induced activation of JAK2, JAK3, and ERK in hADSCs, and pre-treatment of hADSCs with the JAK2 inhibitor, AG490, significantly restored the OSM-induced inhibition of adipogenic differentiation. Whereas, the JAK3 inhibitor, WHI-P131, and the MEK inhibitor, U0126, had no effects on the anti-adipogenic activity of OSM. On the other hand, the pro-osteogenic activity of OSM was prevented by treatment of the cells with WHI-P131 or U0126, but not with AG490. These results indicate that distinct signaling pathways, including JAK2, JAK3, and MEK-ERK, play specific roles in the OSM-induced anti-adipogenic and pro-osteogenic differentiation of hADSCs.
authors.affiliation: Research Center for Ischemic Tissue Regeneration & Medical Research Institute, Pusan National University, Busan 602-739, Republic of Korea.
authors.forename: Hae Young
authors.initials: HY
authors.lastname: Song
authors.forename: Eun Su
authors.initials: ES
authors.lastname: Jeon
authors.forename: Jung Il
authors.initials: JI
authors.lastname: Kim
authors.forename: Jin Sup
authors.initials: JS
authors.lastname: Jung
authors.forename: Jae Ho
authors.initials: JH
authors.lastname: Kim
mesh_terms: D050156:Adipogenesis / Q000187:drug effects* / Q000235:genetics; D000273:Adipose Tissue / Q000166:cytology* / Q000187:drug effects* / Q000201:enzymology; D015415:Biomarkers / Q000378:metabolism; D002454:Cell Differentiation / Q000187:drug effects; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D015850:Interleukin-6 / Q000494:pharmacology; D053614:Janus Kinase 2 / Q000378:metabolism; D053616:Janus Kinase 3 / Q000378:metabolism; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000187:drug effects* / Q000201:enzymology; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D053683:Oncostatin M / Q000494:pharmacology*; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D010012:Osteogenesis / Q000187:drug effects*; D013997:Time Factors
chemical_list: D015415:Biomarkers; D015850:Interleukin-6; D053683:Oncostatin M; D053614:Janus Kinase 2; D053616:Janus Kinase 3; D048049:Extracellular Signal-Regulated MAP Kinases; D020929:Mitogen-Activated Protein Kinase Kinases