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MiR-21 overexpression improves osteoporosis by targeting RECK

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Abstract

Osteoporosis is a kind of metabolic bone disorder. MicroRNA-21 (miR-21) has been proven to play an important role in bone formation, whereas its role in osteoporosis is unclear. In the present study, miR-21 expression was inhibited by TNF-α in mesenchymal stem cells (MSCs). TNF-α induced cell apoptosis, and inhibited cell proliferation and differentiation of MSCs. Whereas the effect was reversed by miR-21 mimics. Expression of reversion-inducing cysteine-rich protein with Kazal motifs (RECK) which is a predicted target of miR-21 was inhibited by miR-21 mimics. A luciferase reporter gene assay showed that miR-21 directly bound to RECK 3′-UTR. The effect of TNF-α on MSCs was reversed by RECK siRNA which was consistent with miR-21 mimics. The expression of MT1-MMP was inhibited by TNF-α and enhanced by RECK siRNA and miR-21 mimics. For the in vivo study, an osteoporosis model (OVX) was established by bilateral oophorectomy in mice. The expression of miR-21 decreased and RECK increased in the OVX mice. When treated with lentiviral RECK shRNA, the osteocalcin concentration and alkaline phosphate activity of the OVX mice decreased. The bone mineral density of the right femur mid-diaphysis was improved by RECK shRNA. Collectively, miR-21 modulated the osteoporosis by targeting RECK. These results emphasize the role of miR-21 during osteoporosis and suggest RECK might be a new medical target for osteoporosis.

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Abbreviations

MSCs:

Mesenchymal stem cells

RECK:

Reversion-inducing cysteine-rich protein with Kazal motifs

OVX:

Ovariectomy

MMP:

Matrix metalloproteinase

ALP:

Alkaline phosphate

BMD:

Bone mineral density

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Orthopedics, The 1st Affiliated Hospital of Medical College, Xi’an Jiaotong University, 277 West Yanta Street, Xi’an, 710061, Shaanxi, China

    Weigong Zhao

  2. Department of Immunology and Pathogenic Biology, School of Medicine, Xi’an Jiaotong University, 76 West Yanta Street, Xi’an, 710061, Shaanxi, China

    Yanying Dong, Caijun Wu, Yunfeng Ma & Yanhong Ji

  3. Department of Pathology, The 2nd Affiliated Hospital of Medical College, Xi’an Jiaotong University, Xi’an, 710004, Shaanxi, China

    Yaofeng Jin

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  1. Weigong Zhao
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Correspondence to Weigong Zhao or Yanhong Ji.

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Zhao, W., Dong, Y., Wu, C. et al. MiR-21 overexpression improves osteoporosis by targeting RECK. Mol Cell Biochem 405, 125–133 (2015). https://doi.org/10.1007/s11010-015-2404-4

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  • DOI: https://doi.org/10.1007/s11010-015-2404-4

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