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miR-342-5p inhibits expression of Bmp7 to regulate proliferation, differentiation and migration of osteoblasts

Xuesen Li1, Kang Li2, Guisheng Yu2

  • 1Department of Orthopedics, The Affiliated Hospital of Qingdao University, Qingdao 266555, Shandong, China.

Molecular Immunology
|August 10, 2019
PubMed
Abstract

Insights

MicroRNA-342-5p inhibition promotes osteoblast function and fracture healing by upregulating Bone Morphogenetic Protein 7 (Bmp7) and activating the MEK/ERK pathway.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Fracture healing is a complex biological process prone to complications like non-union.
  • MicroRNA (miR)-342-5p, a downstream molecule of the Notch signaling pathway, has an unclear role in fracture healing.
  • Understanding miR-342-5p's function in osteoblasts is crucial for addressing impaired bone regeneration.

Purpose of the Study:

  • To investigate the functional role of miR-342-5p in osteoblasts.
  • To elucidate the underlying molecular mechanisms of miR-342-5p in bone regeneration.
  • To explore the relationship between miR-342-5p, Bmp7, and the MEK/ERK pathway in osteogenesis.

Main Methods:

  • Quantitative reverse transcription PCR (qRT-PCR) to assess miR-342-5p expression during osteoblast differentiation.
  • Cell viability, apoptosis, migration, and osteogenic differentiation assays (CCK-8, trypan blue, flow cytometry, Transwell, Western blot).
  • Analysis of downstream targets and signaling pathways, including the MEK/ERK pathway.

Main Results:

  • miR-342-5p expression decreased during osteoblast differentiation.
  • Overexpression of miR-342-5p inhibited osteoblast proliferation, migration, and differentiation, while downregulating Bmp7.
  • Inhibition of miR-342-5p promoted osteoblast function and activated the MEK/ERK pathway, partly through Bmp7 upregulation.

Conclusions:

  • miR-342-5p acts as an inhibitor of osteoblast proliferation, migration, and differentiation.
  • Inhibiting miR-342-5p promotes fracture healing by enhancing osteoblast function via Bmp7 and MEK/ERK pathway activation.
  • Targeting miR-342-5p presents a potential therapeutic strategy for improving bone regeneration.
Keywords:
Bmp7Fracture healingMEK/ERKOsteoblastsmicroRNA-342-5p

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