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Updated: Jun 5, 2025
Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
Published on: June 3, 2016
ATF3 suppresses 3T3-L1 adipocyte adipogenesis by transcriptionally repressing USP53
Abstract:
Obesity is a widespread nutritional disorder, leading to a strong predisposition toward adverse health consequences. Activating transcription factor 3 (ATF3), a stress-induced transcription factor, has been documented as a therapeutic target for obesity. The intent of this project was to characterize the detailed role of ATF3 in adipogenesis in the context of obesity and its obscure downstream mechanism. After adipogenic differentiation, RT-qPCR and western blot examined ATF3 and ubiquitin-specific peptidase 53 (USP53) mRNA levels and protein levels. Adipogenesis was identified by Oil Red O staining, triglyceride (TG) levels, and western blot analysis. JASPAR database, ChIP and luciferase reporter assays predicted and validated the transcriptional regulation of USP53 by ATF3. Western blot also examined the protein levels of Ras homolog family member A (RhoA)/Rho-associated coiled-coil kinase (ROCK) pathway-involved proteins. ATF3 mRNA and protein levels were depleted in the differentiated 3T3-L1 adipocytes, and ATF3 elevation hindered the adipogenesis of 3T3-L1 adipocytes. ATF3 suppressed the transcription of USP53 as a transcription factor and lowered USP53 expression. Eventually, USP53 upregulation partially blunted the inhibitory role of ATF3 overexpression in adipogenesis and the RhoA/ROCK pathway. Consequently, ATF3 might transcriptionally inactivate USP53 to repress adipocyte adipogenesis and downregulate the RhoA/ROCK pathway.
Insights
Activating transcription factor 3 (ATF3) hinders fat cell formation (adipogenesis) by suppressing USP53. This suggests ATF3 is a potential therapeutic target for obesity and related metabolic disorders.
Area of Science:
- Molecular Biology
- Cell Biology
- Metabolic Disorders
Background:
- Obesity is a major health concern linked to numerous adverse health outcomes.
- Activating transcription factor 3 (ATF3), a stress-inducible factor, is recognized as a potential therapeutic target for obesity.
- The precise role and downstream mechanisms of ATF3 in adipogenesis remain incompletely understood.
Purpose of the Study:
- To elucidate the detailed function of ATF3 in adipogenesis within the context of obesity.
- To investigate the downstream molecular mechanisms regulated by ATF3 during fat cell differentiation.
Main Methods:
- Utilized 3T3-L1 cells for adipogenesis studies.
- Employed RT-qPCR and Western blotting to quantify ATF3, USP53, and RhoA/ROCK pathway protein levels.
- Assessed adipogenesis via Oil Red O staining and triglyceride content measurement.
- Predicted and validated ATF3 transcriptional regulation of USP53 using bioinformatic tools (JASPAR), ChIP, and luciferase reporter assays.
Main Results:
- ATF3 expression was reduced during 3T3-L1 adipocyte differentiation.
- Overexpression of ATF3 inhibited adipogenesis and suppressed USP53 transcription and expression.
- USP53 upregulation partially rescued the inhibitory effects of ATF3 on adipogenesis and the RhoA/ROCK pathway.
Conclusions:
- ATF3 acts as a transcriptional repressor of USP53, thereby inhibiting adipocyte differentiation.
- ATF3 influences adipogenesis and the RhoA/ROCK signaling pathway, suggesting a role in metabolic regulation.
- Targeting the ATF3-USP53 axis may offer a novel therapeutic strategy for managing obesity.
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