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MiR-22-3p facilitates bone marrow mesenchymal stem cell osteogenesis and fracture healing through the

Chunqiu Wang1, Xinguo Wang2, Hui Cheng2

  • 1Department of Orthopedics, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.

International Journal of Experimental Pathology
|December 28, 2023
PubMed

Insights

MicroRNA-22-3p promotes bone fracture healing by targeting SOSTDC1 and activating the PI3K/AKT pathway. This study reveals miR-22-3p as a potential therapeutic target for enhancing fracture repair.

Area of Science:

  • Biomedical Engineering
  • Molecular Biology
  • Orthopedics

Background:

  • Bone fractures represent a significant global health burden, necessitating research into effective healing strategies.
  • MicroRNAs (miRNAs) are increasingly recognized for their roles in bone metabolism and disease.
  • The specific function of miR-22-3p in fracture healing remained largely unexplored prior to this study.

Purpose of the Study:

  • To investigate the role and underlying mechanism of miR-22-3p in rat femoral fracture healing.
  • To determine the effect of miR-22-3p on osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs).
  • To elucidate the molecular pathway through which miR-22-3p influences fracture repair.

Main Methods:

  • Establishment of a rat femoral fracture model and isolation of BMSCs.
  • Quantitative real-time PCR (RT-qPCR) and immunohistochemistry to assess miR-22-3p and SOSTDC1 expression.
  • Western blotting for osteogenic proteins, flow cytometry for BMSC identification, and differentiation assays (Alizarin red, ALP, Oil Red O).
  • Luciferase reporter assay to confirm miR-22-3p targeting of SOSTDC1 and in vivo histological analysis (H&E staining).

Main Results:

  • MiR-22-3p was downregulated, while SOSTDC1 was upregulated in fracture callus tissues.
  • Overexpression of miR-22-3p enhanced osteogenic differentiation of BMSCs.
  • MiR-22-3p directly targeted SOSTDC1, activating the PI3K/AKT signaling pathway.
  • Inhibition of SOSTDC1 or PI3K/AKT pathway abrogated the pro-osteogenic effects of miR-22-3p.

Conclusions:

  • MiR-22-3p plays a crucial role in facilitating femoral fracture healing in rats.
  • The mechanism involves miR-22-3p targeting SOSTDC1 to activate the PI3K/AKT pathway, thereby promoting osteogenesis.
  • MiR-22-3p represents a promising therapeutic target for improving fracture healing outcomes.
Keywords:
PI3K/AKTfracture healingmiR-22-3psclerostin domain-containing 1

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