TNFα-induced miR-130 resulted in adipocyte dysfunction during obesity-related inflammation

Area of Science:

• Cell Biology
• Molecular Biology
• Metabolic Disease Research

Background:

• Adipocytes are susceptible to inflammatory cytokines like Tumor Necrosis Factor-alpha (TNFα), which can impair their function.
• MicroRNA-130 (miR-130) is known to regulate adipogenesis by targeting PPARγ mRNA, but its expression regulation during inflammation is unclear.

Purpose of the Study:

• To investigate the mechanisms controlling miR-130 expression in adipocytes under inflammatory conditions.
• To determine the role of miR-130 induction in TNFα-induced adipocyte dysfunction.

Main Methods:

• Analysis of miR-130 levels in white adipose tissue (WAT) from high-fat diet (HFD) fed mice.
• Assessment of miR-130 expression in TNFα-stimulated primary adipocytes.
• Chromatin immunoprecipitation (ChIP) assay to evaluate p65 binding to miR-130 promoter regions.

Main Results:

• miR-130 primary transcripts were elevated following TNFα stimulation, indicating transcriptional regulation.
• TNFα treatment enhanced the binding of p65 to the promoter regions of miR-130.
• Increased miR-130 levels correlate with adipocyte dysfunction.

Conclusions:

• TNFα induces miR-130 expression transcriptionally in adipocytes.
• The p65 subunit of NF-κB is involved in the TNFα-mediated upregulation of miR-130.
• Induced miR-130 contributes to the inflammatory dysfunction of adipocytes.