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Published on: February 28, 2017
Wnt inhibitory factor (WIF)-1 inhibits osteoblastic differentiation in mouse embryonic mesenchymal cells
Sun Wook Cho1, Jae-Yeon Yang, Hyun Jin Sun
1Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea.
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.
Insights
Wnt inhibitory factor (WIF)-1 negatively regulates osteoblastic differentiation in mouse mesenchymal cells. WIF-1 reduces alkaline phosphatase activity and key gene expression during bone cell development, while promoting fat cell formation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Wnt inhibitory factor (WIF)-1 is a secreted modulator of Wnt proteins.
- Secreted frizzled-related proteins (sFRPs) exhibit varied roles in Wnt signaling.
- Understanding WIF-1's function in osteogenesis is crucial for bone biology research.
Purpose of the Study:
- To investigate the functional role of WIF-1 in osteoblastic differentiation.
- To determine WIF-1's impact on mesenchymal stem cell fate.
- To elucidate WIF-1's mechanism in regulating Wnt signaling pathways.
Main Methods:
- Utilized C3H10T1/2 mouse mesenchymal cells.
- Administered WIF-1 protein and Wnt-3a conditioned medium.
- Employed retroviral transduction and RNA interference for WIF-1 manipulation.
- Assessed alkaline phosphatase (ALP) activity and gene expression (Runx2, collagen type 1, osteocalcin).
Main Results:
- WIF-1 treatment dose-dependently inhibited osteogenic medium- and Wnt-3a-induced ALP activity.
- WIF-1 expression decreased during osteoblastogenesis but increased during adipogenesis.
- WIF-1 knockdown elevated ALP activity, indicating a negative regulatory role.
- WIF-1 attenuated beta-catenin/T-cell factor transcriptional activity.
Conclusions:
- WIF-1 acts as a negative regulator of osteoblastic differentiation in C3H10T1/2 cells.
- WIF-1 influences mesenchymal stem cell differentiation towards adipogenesis rather than osteogenesis.
- These findings highlight WIF-1's critical role in modulating Wnt signaling during bone and fat cell development.
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