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MicroRNA-27b Regulates Mitochondria Biogenesis in Myocytes

Linyuan Shen1, Lei Chen2, Shunhua Zhang1

  • 1College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China.

Plos One
|February 6, 2016
PubMed

Insights

MicroRNAs (miRNAs) regulate mitochondrial biogenesis. This study found that miRNA-27b down-regulates forkhead box j3 (Foxj3), impacting mitochondria content during myocyte differentiation.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression at the post-transcriptional level.
  • The precise mechanisms by which miRNAs influence mitochondrial biogenesis remain incompletely understood.
  • Mitochondrial biogenesis is crucial for cellular energy production and is tightly regulated during differentiation.

Purpose of the Study:

  • To investigate the role of miRNA-27b in the regulation of mitochondrial biogenesis.
  • To identify the direct target gene of miRNA-27b involved in this process.
  • To elucidate the molecular pathway through which miRNA-27b affects mitochondria content.

Main Methods:

  • Utilized C2C12 myoblast cell line for studying myogenic differentiation.
  • Quantified mitochondrial content and gene/protein expression levels.
  • Performed luciferase activity assays to confirm direct miRNA-target interaction.
  • Overexpressed miRNA-27b to assess its functional impact on mitochondrial genes and Foxj3.

Main Results:

  • Mitochondrial content increased, while miRNA-27b expression decreased during C2C12 cell differentiation.
  • Forkhead box j3 (Foxj3) was identified as a direct target of miRNA-27b.
  • Overexpression of miRNA-27b led to reduced mitochondrial content and suppressed expression of Foxj3 and its downstream genes (Mef2c, PGC1α, NRF1, mtTFA).

Conclusions:

  • miRNA-27b negatively regulates mitochondrial biogenesis in differentiating myocytes.
  • This regulation occurs through the direct targeting and down-regulation of Foxj3.
  • The findings reveal a novel miRNA-mediated pathway controlling mitochondria development.

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