Eicosapentaenoic acid down-regulates expression of the selenoprotein P gene by inhibiting SREBP-1c protein independently of the AMP-activated protein kinase pathway in H4IIEC3 hepatocytes.
|
| Abstract |
Selenoprotein P (encoded by SELENOP in humans, Selenop in rat), a liver-derived secretory protein, induces resistance to insulin and vascular endothelial growth factor (VEGF) in type 2 diabetes. Suppression of selenoprotein P may provide a novel therapeutic approach to treating type 2 diabetes; however, few drugs inhibiting SELENOP expression in hepatocytes have been identified. The present findings demonstrate that eicosapentaenoic acid (EPA) suppresses SELENOP expression by inactivating sterol regulatory element-binding protein-1c (SREBP-1c, encoded by Srebf1 in rat) in H4IIEC3 hepatocytes. Treatment with EPA caused concentration- and time-dependent reduction in SELENOP promoter activity. EPA activated AMP-activated protein kinase (AMPK); however, the inhibitory effect of EPA on SELENOP promoter activity was not canceled with an AMPK inhibitor compound C and dominant-negative AMPK transfection. Deletion mutant promoter assays and computational analysis of transcription factor-binding sites conserved among the species resulted in identification of a sterol regulatory element (SRE)-like site in the SELENOP promoter. A chromatin immunoprecipitation (ChIP) assay revealed that EPA decreases binding of SREBP-1c to the SELENOP promoter. Knockdown of Srebf1 resulted in a significant down-regulation of Selenop expression. Conversely, SREBP-1c overexpression inhibited the suppressive effect of EPA. These data provide a novel mechanism of action for EPA involving improvement of systemic insulin sensitivity through the regulation of selenoprotein P production independently of the AMPK pathway and suggest an additional approach to developing anti-diabetic drugs.
|
|---|---|
| Authors | Natsumi Tajima-Shirasaki, Kiyo-Aki Ishii, Hiroaki Takayama, Takayoshi Shirasaki, Hisakazu Iwama, Keita Chikamoto, Yoshiro Saito, Yasumasa Iwasaki, Atsushi Teraguchi, Fei Lan, Akihiro Kikuchi, Yumie Takeshita, Koji Murao, Seiichi Matsugo, Shuichi Kaneko, Hirofumi Misu, Toshinari Takamura |
| Journal | The Journal of biological chemistry (J Biol Chem) Vol. 292 Issue 26 Pg. 10791-10800 (06 30 2017) ISSN: 1083-351X [Electronic] United States |
| PMID | 28465347 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
| Copyright | © 2017 by The American Society for Biochemistry and Molecular Biology, Inc. |
| Chemical References |
|
| Topics |
|
Join CureHunter, for free Research Interface BASIC access!
Realize the full power of the drug-disease research graph!