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Chebulinic Acid Suppresses Adipogenesis in 3T3-L1 Preadipocytes by Inhibiting PPP1CB Activity
Jinsoo Kim1, Dohee Ahn1, Sang J Chung1,2
1School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea.
Abstract:
Depletion of protein phosphatase-1 catalytic subunit beta (PPP1CB), a serine/threonine protein phosphatase and potent adipogenic activator, suppresses the differentiation of 3T3-L1 preadipocytes into mature adipocytes. Therefore, PPP1CB is considered as a potential therapeutic target for obesity. We screened 1033 natural products for PPP1CB inhibitors and identified chebulinic acid, which is abundantly present in the seeds of Euphoria longana and fruits of Terminalia chebula. Chebulinic acid strongly inhibited the hydrolysis of 6,8-difluoro-4-methylumbelliferyl phosphate by PPP1CB (IC50 = 300 nM) and demonstrated potent antiadipogenic effects in 3T3-L1 preadipocytes in a concentration-dependent manner. Additional studies have demonstrated that chebulinic acid suppresses early differentiation by downregulating key transcription factors that control adipogenesis in 3T3-L1 cells. These results suggested that chebulinic acid may be a potential therapeutic agent for treating obesity by inhibiting PPP1CB activity.
Insights
Chebulinic acid inhibits protein phosphatase-1 catalytic subunit beta (PPP1CB), a key factor in fat cell development. This natural compound shows potential as a therapeutic for obesity by blocking PPP1CB activity and preventing adipogenesis.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Protein phosphatase-1 catalytic subunit beta (PPP1CB) is a serine/threonine protein phosphatase that activates adipogenesis.
- PPP1CB plays a crucial role in the differentiation of preadipocytes into mature adipocytes.
- PPP1CB is recognized as a potential therapeutic target for obesity management.
Purpose of the Study:
- To identify natural products that inhibit PPP1CB.
- To evaluate the antiadipogenic effects of identified inhibitors.
- To investigate the mechanism of action of potential therapeutic agents for obesity.
Main Methods:
- Screening of 1033 natural products for PPP1CB inhibitors.
- Enzyme inhibition assays using 6,8-difluoro-4-methylumbelliferyl phosphate.
- Assessment of antiadipogenic effects in 3T3-L1 preadipocytes.
- Analysis of key adipogenic transcription factors.
Main Results:
- Chebulinic acid was identified as a potent PPP1CB inhibitor (IC50 = 300 nM).
- Chebulinic acid demonstrated significant antiadipogenic effects in 3T3-L1 cells in a dose-dependent manner.
- Chebulinic acid suppressed early adipocyte differentiation by downregulating key transcription factors.
Conclusions:
- Chebulinic acid is a natural product that effectively inhibits PPP1CB activity.
- Chebulinic acid exhibits potent antiadipogenic properties.
- Chebulinic acid represents a potential therapeutic candidate for obesity treatment by targeting PPP1CB.
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