title: Wnt inhibitory factor (WIF)-1 inhibits osteoblastic differentiation in mouse embryonic mesenchymal cells.
abstract: Wnt inhibitory factor (WIF)-1 belongs to the members of secreted modulators of Wnt proteins. Secreted frizzled-related proteins (sFRPs), another member of Wnt modulators, have been shown to play differential roles in Wnt signaling depending on the subtypes and cell models. This study was undertaken to investigate the functional role of WIF-1 in osteoblastic differentiation of mouse mesenchymal C3H10T1/2 cells. C3H10T1/2 cells express endogenous WIF-1 and its expression level decreases during osteoblastogenesis. Treatment of C3H10T1/2 cells with WIF-1 significantly reduced alkaline phosphatase (ALP) activities induced by either osteogenic medium (OM, ascorbic acid and beta-glycerophosphate) or Wnt-3a conditioned medium (CM) in a dose-dependent manner. In contrast, the expression level of endogenous WIF-1 increased during adipogenesis and WIF-1 treatment resulted in increased adipogenesis. C3H10T1/2 cells transduced with WIF-1 retrovirus also exhibited reduced ALP activity and decreased mRNA expression of Runx2, collagen type 1, ALP and osteocalcin during osteoblastic differentiation compared to empty virus-transduced cells. Moreover, treatment with WIF-1 dose-dependently attenuates beta-catenin/T-cell factor (TCF) transcriptional activity in this cell line. Finally, knockdown of WIF-1 in C3H10T1/2 cells by RNA interference leads to increase in ALP activities. Collectively, these results indicate that WIF-1 plays as a negative regulator of osteoblastic differentiation in mouse mesenchymal C3H10T1/2 cells in vitro.
authors.affiliation: Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
authors.forename: Sun Wook
authors.initials: SW
authors.lastname: Cho
authors.forename: Jae-Yeon
authors.initials: JY
authors.lastname: Yang
authors.forename: Hyun Jin
authors.initials: HJ
authors.lastname: Sun
authors.forename: Ju Yeon
authors.initials: JY
authors.lastname: Jung
authors.forename: Sun Ju
authors.initials: SJ
authors.lastname: Her
authors.forename: Hwa Young
authors.initials: HY
authors.lastname: Cho
authors.forename: Hyung Jin
authors.initials: HJ
authors.lastname: Choi
authors.forename: Sang Wan
authors.initials: SW
authors.lastname: Kim
authors.forename: Seong Yeon
authors.initials: SY
authors.lastname: Kim
authors.forename: Chan Soo
authors.initials: CS
authors.lastname: Shin
mesh_terms: D041721:3T3-L1 Cells; D048868:Adaptor Proteins, Signal Transducing; D050156:Adipogenesis / Q000187:drug effects / Q000235:genetics; D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D015153:Blotting, Western; D002454:Cell Differentiation / Q000187:drug effects* / Q000235:genetics; D002460:Cell Line; D024042:Collagen Type I / Q000235:genetics; D050659:Core Binding Factor Alpha 1 Subunit / Q000235:genetics; D004789:Enzyme Activation / Q000187:drug effects; D016326:Extracellular Matrix Proteins / Q000235:genetics / Q000494:pharmacology / Q000502:physiology*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000494:pharmacology / Q000502:physiology*; D059630:Mesenchymal Stem Cells / Q000166:cytology* / Q000187:drug effects* / Q000378:metabolism; D051379:Mice; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects* / Q000378:metabolism; D015675:Osteocalcin / Q000235:genetics; D010012:Osteogenesis / Q000187:drug effects / Q000235:genetics; D034622:RNA Interference; D020133:Reverse Transcriptase Polymerase Chain Reaction; D051820:TCF Transcription Factors / Q000235:genetics; D014162:Transfection; D051176:beta Catenin / Q000235:genetics
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D024042:Collagen Type I; D050659:Core Binding Factor Alpha 1 Subunit; D016326:Extracellular Matrix Proteins; D036341:Intercellular Signaling Peptides and Proteins; C493716:Runx2 protein, mouse; D051820:TCF Transcription Factors; C118544:Wif1 protein, mouse; D051176:beta Catenin; D015675:Osteocalcin; D000469:Alkaline Phosphatase