Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Peroxisome Proliferator-Activated Receptor α Facilitates Osteogenic Differentiation in MC3T3-E1 Cells via the Sirtuin 1-Dependent Signaling Pathway

  • Gong, Kai (Department of Orthopaedics, Chengdu Military General Hospital) ;
  • Qu, Bo (Department of Orthopaedics, Chengdu Military General Hospital) ;
  • Wang, Cairu (Department of Orthopaedics, Chengdu Military General Hospital) ;
  • Zhou, Jingsong (Department of Orthopaedics, Chengdu Military General Hospital) ;
  • Liao, Dongfa (Department of Orthopaedics, Chengdu Military General Hospital) ;
  • Zheng, Wei (Department of Orthopaedics, Chengdu Military General Hospital) ;
  • Pan, Xianming (Department of Orthopaedics, Chengdu Military General Hospital)
  • Received : 2017.02.06
  • Accepted : 2017.05.03
  • Published : 2017.06.30
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Abstract

Type 2 diabetes mellitus (T2DM) is a chronic metabolic disease characterized by lack of insulin and high glucose levels. T2DM can cause bone loss and fracture, thus leading to diabetic osteoporosis. Promoting osteogenic differentiation of osteoblasts may effectively treat diabetic osteoporosis. We previously reported that Sirtuin 1 (Sirt1), a $NAD^+$-dependent deacetylase, promotes osteogenic differentiation through downregulation of peroxisome proliferator-activated receptor (PPAR) ${\gamma}$. We also found that miR-132 regulates osteogenic differentiation by downregulating Sirt1 in a $PPAR{\beta}/{\delta}$-dependent manner. The ligand-activated transcription factor, $PPAR{\alpha}$, is another isotype of the peroxisome proliferator-activated receptor family that helps maintain bone homeostasis and promot bone formation. Whether the regulatory role of $PPAR{\alpha}$ in osteogenic differentiation is mediated via Sirt1 remains unclear. In the present study, we aimed to determine this role and the underlying mechanism by using high glucose (HG) and free fatty acids (FFA) to mimic T2DM in MC3T3-E1 cells. The results showed that HG-FFA significantly inhibited expression of $PPAR{\alpha}$, Sirt1 and osteogenic differentiation, but these effects were markedly reversed by $PPAR{\alpha}$ overexpression. Moreover, siSirt1 attenuated the positive effects of $PPAR{\alpha}$ on osteogenic differentiation, suggesting that $PPAR{\alpha}$ promotes osteogenic differentiation in a Sirt1-dependent manner. Luciferase activity assay confirmed interactions between $PPAR{\alpha}$ and Sirt1. These findings indicate that $PPAR{\alpha}$ promotes osteogenic differentiation via the Sirt1-dependent signaling pathway.

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References

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