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- W4248320908 abstract "Abstract Objective: Many studies have demonstrated that curcumin can downregulate mRNA levels of sterol regulatory element-binding proteins (SREBP-2), however, our study did not find similar results. This study was designed to demonstrate that curcumin inhibits the proteolytic process of SREBP-2 by first inhibiting the expression of membrane-bound transcription factor site-1 protease (S1P) rather than directly inhibiting SREBP-2 expression. Methods: After curcumin treatment, Caco-2 cells were collected to observe the dose- and time-dependent dynamics of precursor and mature SREBP-2, transcription factor specific protein 1 (SP-1) and SREBP cleavage-activating protein (SCAP). After curcumin treatment, SREBP-2 distribution was detected in the cells and S1P protein expression were examined. Results: Curcumin could downregulate mRNA levels of SREBP2, SP-1 and SCAP, but it did not simultaneously downregulate the expression of precursor SREBP-2 (pSREBP-2) and SCAP. Curcumin can inhibit the proteolytic process of SREBP-2, reduce the production of mature SREBP-2 (mSREBP-2) and change the cellular distribution of SREBP-2. The inhibitory effect of curcumin on SP-1 protein expression is short-acting. Conclusion: Curcumin can inhibit the SREBP-2 proteolytic process to reduce mSREBP-2 which functions as a transcription factor, affecting the regulation of cholesterol metabolism-related genes. This process may be achieved by regulating the expression of S1P. Curcumin does not directly inhibit the expression of mSREBP-2 protein, and it has no such inhibitory effect for at least a short period of time, although curcumin does reduce the amount of mSREBP-2 protein." @default.
- W4248320908 created "2022-05-12" @default.
- W4248320908 creator A5048155805 @default.
- W4248320908 creator A5071229608 @default.
- W4248320908 date "2020-03-17" @default.
- W4248320908 modified "2023-09-27" @default.
- W4248320908 title "Curcumin Inhibits the Proteolytic Process of SREBP-2 by First Inhibiting the Expression of S1P rather than Directly Inhibiting SREBP-2 Expression." @default.
- W4248320908 doi "https://doi.org/10.21203/rs.3.rs-17491/v1" @default.
- W4248320908 hasPublicationYear "2020" @default.
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