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Published on: May 4, 2021
Widdrol blocks 3T3-L1 preadipocytes growth and differentiation due to inhibition of mitotic clonal expansion
Hee-Jung Yun1, Jeong-Hwan Kim, Hyun-Young Jeong
1Department of Biomaterial Control (BK21 program), Dong-Eui University Graduate School, Busan 614-714, Republic of Korea.
Abstract:
Adipocyte differentiation is strongly associated with obesity, which causes metabolic disorders. In this study, we investigated the inhibitory effects of widdrol on 3T3- L1 preadipocyte growth and differentiation. Widdrol decreased lipid droplet accumulation and down-regulated adipogenic transcription factors such as C/EBPalpha, C/EBPbeta, and PPARgamma. Widdrol blocked preadipocyte proliferation and differentiation through the inhibition of mitotic clonal expansion, which was accompanied by the failure of degradation of p21, a cyclin-dependent kinase inhibitor. Cell-cycle analysis clearly indicated that widdrol actively induces cell-cycle arrest at the G1-S phage transition, causing cells to remain in the preadipocyte state. Moreover, widdrol increased p21 expression and inhibited Rb phosphorylation in preadipocyte incubated in a hormone medium. Therefore, these findings clearly suggest that widdrol blocks preadipocyte growth and differentiation through the inhibition of mitotic clonal expansion by p21- and Rb-dependent G1 arrest and can be developed as a potent anti-adipogenic agent for reducing obesity.
Insights
Widdrol inhibits 3T3-L1 preadipocyte growth and differentiation by causing cell-cycle arrest. This compound shows potential as an anti-obesity agent by blocking fat cell development.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- Adipocyte differentiation is a key process in obesity development and associated metabolic disorders.
- Targeting preadipocyte proliferation and differentiation offers a strategy for obesity management.
Purpose of the Study:
- To investigate the anti-adipogenic effects of widdrol on 3T3-L1 preadipocytes.
- To elucidate the molecular mechanisms underlying widdrol's inhibitory action on adipogenesis.
Main Methods:
- Treatment of 3T3-L1 preadipocytes with widdrol.
- Assessment of lipid droplet accumulation and adipogenic transcription factor expression (C/EBPα, C/EBPβ, PPARγ).
- Analysis of preadipocyte proliferation, mitotic clonal expansion, and cell-cycle progression (G1-S phase).
- Evaluation of p21 expression and Rb phosphorylation.
Main Results:
- Widdrol significantly reduced lipid accumulation and downregulated key adipogenic transcription factors.
- Widdrol inhibited preadipocyte proliferation by blocking mitotic clonal expansion.
- Widdrol induced G1-S phase cell-cycle arrest, increased p21 expression, and inhibited Rb phosphorylation.
Conclusions:
- Widdrol effectively blocks preadipocyte growth and differentiation through p21- and Rb-dependent G1 arrest.
- Widdrol's mechanism involves inhibiting mitotic clonal expansion, offering a potential therapeutic strategy for obesity.
