Abstract
Growth differentiation factor 11 (GDF11) is a member of the transforming growth factor-β superfamily. Recent studies confirmed that GDF11 plays an important role in regulating the regeneration of brain, skeletal muscle, and heart during aging; however, its role in bone metabolism remains unclear. Thus, the aim of this study was to determine the effects of GDF11 on bone metabolism, including bone formation and bone resorption, both in vitro and in vivo. Our results showed that GDF11 inhibited osteoblastic differentiation of bone marrow mesenchymal stem cells in vitro. Mechanistically, GDF11 repressed Runx2 expression by inducing SMAD2/3 phosphorylation during osteoblast differentiation. Moreover, intraperitoneal injection of GDF11 inhibited bone formation and accelerated age-related bone loss in mice. Our results also showed that GDF11 had no effect on osteoclast differentiation or bone resorption both in vitro and in vivo. These results provide a further rationale for the therapeutic targeting of GDF11 for the treatment of age-related osteoporosis.
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Acknowledgments
This work was supported by Grant No. 81520108008 from the Major International (Regional) Joint Research Project of China National Natural Scientific Foundation (NSFC), Grant No. 81125006 from the Distinguished Young Scientists of China National Natural Scientific Foundation, Grant No. U1301222 from the NSFC-Guangdong Joint Project, and Grant No. 81570806 from the China National Natural Scientific Foundation.
Author Contributions
Study design: XHL; Study conduct: QL, MLT, CJL, ZL, TL, and XHL; Data collection: QL, MLT, CJL, and ZL; Data analysis: XHL, QL, MLT, and CJL; Data interpretation: XHL, QL, MLT, CJL, and LZ; Drafting manuscript: XHL, QL, MLT, and CJL; Revising manuscript content: XHL and QL; Approval of the final manuscript: QL, MLT, CJL, ZL, TL and XHL; XHL and QL are primarily responsible for integrity of the data analysis, and all authors take responsibility for and attest to the integrity of the data analysis. XHL is responsible for transmitting the editors’ comments to the other authors.
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Xiang-Hang Luo, Qiong Lu, Man-Li Tu, Chang-Jun Li, Li Zhang, Tie-Jian Jiang, and Tang Liu declare that they have no conflict of interest.
Human and Animal Rights and Informed Consent
Mouse cell line and mice were used in this study. All animal experiments were approved by the Animal Care and Use Committee of the Laboratory Animal Research Center at Xiangya Medical School of Central South University (Changsha, Hunan, China). Strict accordance with the recommendations in the Guide for the Care and Use of Laboratory Animals. No human specimen was used in this study.
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Lu, Q., Tu, ML., Li, CJ. et al. GDF11 Inhibits Bone Formation by Activating Smad2/3 in Bone Marrow Mesenchymal Stem Cells. Calcif Tissue Int 99, 500–509 (2016). https://doi.org/10.1007/s00223-016-0173-z
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DOI: https://doi.org/10.1007/s00223-016-0173-z