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RMR-Related DNAJC6 Expression Suppresses Adipogenesis in 3T3-L1 Cells
Juhee Kim1,2, Myoungsook Lee1,3
1Department of Food & Nutrition, Sungshin Women's University, Seoul 01133, Korea.
Cells
|April 23, 2022
Summary
The DNAJC6 gene suppresses adipogenesis, impacting resting metabolic rate (RMR) and energy metabolism. This discovery reveals a new mechanism in childhood obesity by affecting lipolysis, insulin signaling, and mitochondrial function.
Area of Science:
- Genetics and Molecular Biology
- Metabolic Disorders
- Cellular Biology
Background:
- Obesity is linked to severe health issues like type 2 diabetes and cardiovascular disease.
- The DNAJC6 gene was identified in a pilot GWAS as significantly related to resting metabolic rate (RMR) in childhood obesity.
- Understanding novel genetic factors influencing energy imbalance is crucial for obesity research.
Purpose of the Study:
- To investigate the role of DNAJC6 in obesity by examining its effects on adipogenesis and energy metabolism.
- To elucidate the molecular mechanisms by which DNAJC6 influences cellular processes related to fat cell development and function.
- To explore the impact of DNAJC6 overexpression on adipogenesis-related biomarkers, lipolysis, insulin signaling, and mitochondrial activity.
Main Methods:
- Utilized 3T3-L1 cells overexpressing DNAJC6 (Tg cells) to study obesity mechanisms.
- Assessed adipogenesis through Oil red O staining and cell morphology assays (DAPI/BODIPY).
- Quantified gene and protein expression of adipogenesis markers (PPARγ, C/EBPα, aP2), adipokines (leptin, adiponectin), lipolysis indicators (pHSL, free glycerol), insulin signaling components (insulin receptor, AKT, IRS-1, GLUT4), and mitochondrial function markers (oxygen consumption, ATP production, UCP1).
- Monitored autophagy markers (LC3).
Main Results:
- DNAJC6 overexpression inhibited lipid droplet formation and adipocyte differentiation.
- Expression of key adipogenesis biomarkers, adipokines, lipolysis markers, and insulin signaling components (including AKT phosphorylation and GLUT4) were significantly reduced in Tg cells.
- Mitochondrial function, including oxygen consumption and ATP production, was impaired in Tg cells.
- Increased autophagosomal protein LC3 indicated elevated autophagy.
Conclusions:
- DNAJC6 acts as a suppressor of adipogenesis, contributing to a novel mechanism in energy metabolism and obesity.
- Reduced DNAJC6 expression negatively impacts lipolysis, adipokine secretion, insulin sensitivity, and mitochondrial function.
- This study provides the first evidence linking DNAJC6 to RMR and offers new insights into cellular energy balance in the context of obesity.
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