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Updated: May 10, 2026

Mechanism of Regulation of Adipocyte Numbers in Adult Organisms Through Differentiation and Apoptosis Homeostasis
Published on: June 3, 2016
E3 ubiquitin ligase E6AP negatively regulates adipogenesis by downregulating proadipogenic factor C/EBPalpha
Pooja Pal1, Savita Lochab, Jitendra Kumar Kanaujiya
1LSS008, DTDD Division, CSIR-Central Drug Research Institute, Lucknow, India.
E3 ubiquitin ligase E6AP inhibits adipocyte differentiation by degrading CCAAT/Enhancer Binding Protein Alpha (C/EBPα). Knocking down E6AP promotes adipogenesis, revealing E6AP
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- CCAAT/Enhancer Binding Protein Alpha (C/EBPα) is crucial for adipocyte differentiation.
- The role of E3 ubiquitin ligases in adipogenesis is not fully understood.
Purpose of the Study:
- To investigate the role of E6AP, an E3 ubiquitin ligase, in adipocyte differentiation.
- To elucidate the mechanism by which E6AP affects C/EBPα during adipogenesis.
Main Methods:
- 3T3-L1 cell culture and differentiation assays.
- Oil red staining for lipid droplet quantification.
- Western blotting to assess protein levels of C/EBPα.
- Gene silencing (knockdown) and overexpression studies of E6AP.
- Analysis of proadipogenic gene expression.
Main Results:
- E6AP inhibits adipocyte differentiation in 3T3-L1 cells, evidenced by reduced lipid accumulation.
- E6AP knockdown promotes adipocyte differentiation independently of hormonal induction.
- E6AP targets C/EBPα for degradation via the ubiquitin-proteasome pathway, thus downregulating its protein levels.
- Catalytically inactive E6AP mutant (E6AP-C843A) stabilizes C/EBPα and promotes adipogenesis.
Conclusions:
- E6AP acts as a negative regulator of adipogenesis.
- E6AP inhibits adipocyte differentiation by promoting the degradation of C/EBPα.
- Targeting E6AP could be a potential strategy for modulating adipogenesis.
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