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MiR-146b accelerates osteoarthritis progression by targeting alpha-2-macroglobulin

Xin Liu1,2, Liangliang Liu1,2, Hongbo Zhang1,2

  • 1Department of Orthopedics, Academy of Orthopaedics, Guangdong Province, The Third Affiliated Hospital of Southern Medical University, Guangzhou 510630, China.

Aging
|August 20, 2019
PubMed

Insights

MicroRNA-146b (miR-146b) accelerates osteoarthritis progression by targeting Alpha-2-macroglobulin (A2M), increasing cartilage degradation. Inhibiting miR-146b protects against osteoarthritis, suggesting it as a therapeutic target.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biomedical Research

Background:

  • Osteoarthritis (OA) is a degenerative joint disease marked by extracellular matrix (ECM) breakdown in chondrocytes.
  • The specific role of microRNA-146b (miR-146b) in OA pathogenesis is not well understood.

Purpose of the Study:

  • To investigate the function of miR-146b in the progression of osteoarthritis.
  • To determine the molecular mechanisms underlying miR-146b's effect on chondrocyte ECM degradation.

Main Methods:

  • Mouse chondrocytes were transfected with miRNA mimics/inhibitors and treated with IL-1β.
  • Cell viability, caspase activation, and proteolytic enzyme expression were measured using RT-PCR, ELISA, and Western blots.
  • Luciferase reporter assays and in vivo DMM-induced OA models were employed to validate targets and therapeutic potential.

Main Results:

  • Downregulation of miR-146b significantly inhibited IL-1β-induced caspase activation and proteolytic enzyme expression.
  • miR-146b directly targets Alpha-2-macroglobulin (A2M) mRNA, negatively regulating its expression.
  • Inhibition of miR-146b in vivo ameliorated DMM-induced osteoarthritis by reducing cartilage proteoglycan degradation.

Conclusions:

  • miR-146b promotes osteoarthritis progression by targeting A2M, leading to increased proteolytic enzyme production and chondrocyte apoptosis.
  • miR-146b and A2M represent potential therapeutic targets for managing osteoarthritis.
Keywords:
alpha-2-macroglobulinapoptosischondrocytesmiR-146bosteoarthritis

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