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Let-7a-5p inhibits BMSCs osteogenesis in postmenopausal osteoporosis mice

Wenpu Ma1, Qingjun Dou1, Xin Ha2

  • 1Department of Orthopaedics, Liaocheng People's Hospital, No. 67 Dongchang West Road, Liaocheng City, Shandong Province, 252000, China.

Biochemical and Biophysical Research Communications
|January 21, 2019
PubMed
Abstract

Insights

High let-7a-5p levels inhibit bone marrow mesenchymal stem cell differentiation in osteoporosis. This microRNA targets TGFBR1, suggesting a mechanism for postmenopausal osteoporosis.

Area of Science:

  • Biomedical research
  • Stem cell biology
  • Osteoporosis research

Background:

  • Postmenopausal osteoporosis (PMOP) is a significant health concern.
  • Bone marrow mesenchymal stem cells (BMSCs) play a crucial role in bone formation.
  • Understanding the molecular mechanisms regulating BMSC osteogenic differentiation is vital for PMOP treatment.

Purpose of the Study:

  • To investigate the role of microRNA let-7a-5p in the osteogenic differentiation of BMSCs.
  • To elucidate the mechanism by which let-7a-5p affects BMSC function in a mouse model of PMOP.
  • To identify potential molecular targets of let-7a-5p involved in osteoporosis.

Main Methods:

  • Established a mouse model of PMOP and confirmed using micro-CT.
  • Cultured BMSCs from sham and PMOP mice, inducing osteogenic differentiation.
  • Quantified let-7a-5p expression via qRT-PCR and assessed osteogenic markers (ALP, alizarin red, Runx2, Osterix) using qRT-PCR and Western blot.
  • Validated the targeting relationship between let-7a-5p and TGFBR1 using luciferase reporter gene assays.

Main Results:

  • The PMOP mouse model was successfully established.
  • let-7a-5p expression was significantly upregulated in BMSCs from PMOP mice compared to sham controls.
  • Overexpression of let-7a-5p inhibited BMSC osteogenic differentiation, evidenced by reduced ALP activity and calcified nodule formation.
  • let-7a-5p suppressed the expression of key osteogenic transcription factors, Runx2 and Osterix.
  • TGFBR1 was confirmed as a direct target gene of let-7a-5p.

Conclusions:

  • let-7a-5p acts as an inhibitor of osteogenic differentiation in BMSCs.
  • The inhibitory effect of let-7a-5p on osteogenesis in PMOP mice is mediated through the regulation of its target gene, TGFBR1.
  • Targeting the let-7a-5p/TGFBR1 axis may offer a therapeutic strategy for postmenopausal osteoporosis.
Keywords:
Bone marrow mesenchymal stem cellsLet-7a-5pPostmenopausal osteoporosisTGFBR1

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