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Related Experiment Video

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Mitoregulin Controls β-Oxidation in Human and Mouse Adipocytes.

Max Friesen1, Curtis R Warren2, Haojie Yu1

  • 1Division of Cardiovascular Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02115, USA.

Stem Cell Reports
|April 4, 2020
PubMed
Summary

Mitochondrial protein mitoregulin (MTLN), encoded by LINC00116, regulates fat metabolism in human and mouse fat cells. This discovery offers potential therapeutic targets for obesity by enhancing triglyceride clearance.

Keywords:
MTLNadipocytehuman stem cellsmetabolic diseasemetabolismmitochondrial metabolism

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Area of Science:

  • Metabolic research
  • Molecular biology
  • Genetics

Background:

  • A long non-coding RNA (lncRNA) in mouse adipocytes, homologous to human LINC00116, was previously found to regulate adipogenesis.
  • This lncRNA contains a conserved coding region with potential protein-coding capacity.

Purpose of the Study:

  • To investigate the protein expression and function of the peptide encoded by human LINC00116, identified as mitoregulin (MTLN).
  • To determine MTLN's role in adipocyte metabolism, specifically triglyceride clearance, lipolysis, and mitochondrial fatty acid oxidation.

Main Methods:

  • Analysis of human protein expression from LINC00116.
  • Functional studies in human stem cell-derived adipocytes and isolated murine adipocytes.
  • Investigation of systemic lipid phenotypes in knockout mice.
  • Biochemical assays to determine MTLN's interaction with mitochondrial proteins.

Main Results:

  • Human protein expression of a peptide within LINC00116 (MTLN) was confirmed.
  • MTLN modulates triglyceride clearance in human adipocytes by regulating lipolysis and mitochondrial beta-oxidation.
  • MTLN directly interacts with the beta subunit of the mitochondrial trifunctional protein, crucial for fatty acid oxidation.
  • Knockout mice exhibited systemic lipid phenotypes, and both murine and human adipocytes showed autonomous MTLN phenotypes.

Conclusions:

  • MTLN plays a significant regulatory role in adipocyte metabolism.
  • MTLN's function in promoting white adipocyte triglyceride clearance presents a potential therapeutic avenue for obesity.
  • Further research is warranted to explore MTLN's therapeutic potential, considering associated caveats.