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Bone marrow stem cells-derived exosomes extracted from osteoporosis patients inhibit osteogenesis via

L-B Jiang1, L Tian, C-G Zhang

  • 1Department of Orthopedics, Guangzhou University of Chinese Medicine, Guangzhou, China. Shuangyugang@163.com.

European Review for Medical and Pharmacological Sciences
|October 20, 2018
PubMed
Abstract

Insights

MicroRNA-21 in exosomes from osteoporosis patients

Area of Science:

  • Biomedical research
  • Stem cell biology
  • Molecular biology

Background:

  • Osteoporosis is a bone disease characterized by low bone mass and microarchitectural deterioration.
  • Mesenchymal stem cells (MSCs) play a crucial role in bone formation and regeneration.
  • Exosomes are small vesicles involved in intercellular communication, carrying various biomolecules.

Purpose of the Study:

  • To investigate the role of microRNA-21 (miR-21) within exosomes derived from mesenchymal stem cells (MSCs) of osteoporosis patients.
  • To determine if these exosomes inhibit osteogenesis by targeting the SMAD7 gene.

Main Methods:

  • Isolation and culture of MSCs from healthy donors and osteoporosis patients.
  • Characterization of MSCs and their osteogenic potential.
  • Isolation and characterization of exosomes using ultracentrifugation.
  • Quantification of miR-21 and SMAD7 expression in MSCs and exosomes.
  • Assessment of osteogenic markers (Runx2, ALP, Bglap) and ALP activity.
  • Luciferase reporter gene assay to confirm miR-21 and SMAD7 interaction.

Main Results:

  • MSCs from osteoporosis patients exhibited normal morphology and differentiation potential.
  • Exosomes from osteoporosis patients' MSCs showed significantly higher miR-21 levels compared to healthy controls.
  • Treatment with exosomes from osteoporosis patients' MSCs reduced Runx2 expression and ALP activity in recipient MSCs.
  • SMAD7 was validated as a direct target of miR-21 and was downregulated in exosomes from osteoporosis patients.
  • Overexpression of SMAD7 led to decreased expression of osteogenic markers (ALP, Bglap, Runx2).

Conclusions:

  • MicroRNA-21 within exosomes derived from osteoporosis patients' MSCs inhibits osteogenesis.
  • This inhibition occurs through the downregulation of SMAD7, a key regulator of bone formation.

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