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MiR-19b-3p accelerates bone loss after spinal cord injury by suppressing osteogenesis via regulating PTEN/Akt/mTOR

Da Liu1, Bo Wang2, Min Qiu1

  • 1Department of Orthopedics, Shengjing Hospital of China Medical University, Shenyang, People's Republic of China.

Journal of Cellular and Molecular Medicine
|December 17, 2020
PubMed

Insights

MicroRNA-19b-3p exacerbates bone loss after spinal cord injury (SCI) by inhibiting osteogenesis. Targeting miR-19b-3p with antagomirs can reverse this bone loss, offering a potential therapeutic strategy.

Area of Science:

  • Biomedical research
  • Molecular biology
  • Skeletal biology

Background:

  • Spinal cord injury (SCI) leads to significant bone loss, impacting patient quality of life.
  • MicroRNA (miRNA) dysfunction is implicated in post-SCI bone loss, but specific mechanisms remain unclear.
  • The role of miR-19b-3p in SCI-induced bone loss requires elucidation.

Purpose of the Study:

  • To investigate the role of the miR-19b-3p/PTEN axis in osteogenesis following SCI.
  • To explore the underlying molecular mechanisms, including autophagy and signaling pathways.

Main Methods:

  • Analysis of miR-19b-3p levels in SCI rat femurs.
  • Overexpression of miR-19b-3p in bone marrow mesenchymal stem cells (BMSCs).
  • Investigation of PTEN, Akt, and mTOR phosphorylation.
  • Assessment of autophagy modulation using rapamycin.
  • Treatment of SCI rats with antagomir-19b-3p.

Main Results:

  • miR-19b-3p levels were elevated in SCI rat femurs with reduced autophagy.
  • Overexpressing miR-19b-3p in BMSCs suppressed osteogenic differentiation by downregulating PTEN and activating Akt/mTOR signaling.
  • Autophagy inhibition was linked to miR-19b-3p's suppressive effect on osteogenesis.
  • Rapamycin treatment mitigated the inhibitory effects of miR-19b-3p.
  • Antagomir-19b-3p administration reversed bone loss in SCI rats.

Conclusions:

  • miR-19b-3p promotes bone loss post-SCI by inhibiting osteogenesis.
  • The miR-19b-3p/PTEN/Akt/mTOR pathway regulates osteogenic differentiation via autophagy.
  • miR-19b-3p is a potential therapeutic target for treating bone loss after SCI.
Keywords:
autophagybone lossmiR-19b-3pspinal cord injury

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