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| Content Provider | PubMed Central |
|---|---|
| Author | Takaishi, Kiyosumi Duplomb, Laurence Wang, May-yun Li, Jinping Unger, Roger H. |
| Copyright Year | 2004 |
| Abstract | To determine whether the antilipogenic actions of insulin-induced gene 1 (insig-1) demonstrated in cultured preadipocytes also occur in vivo, we infected Zucker diabetic fatty (ZDF) (fa/fa) rats, with recombinant adenovirus containing insig-1 or -2 cDNA. An increase of both proteins appeared in their livers. In control ZDF (fa/fa) rats infected with adenovirus containing the β-galactosidase (β-gal) cDNA, triacylglycerols in the liver and plasma rose steeply whereas the insig-infected rats exhibited substantial attenuation of the increase in hepatic steatosis and hyperlipidemia. Insig overexpression was associated with a striking reduction in the elevated level of nuclear sterol regulatory element-binding protein (SREBP)-1c, the activated form of the transcription factor. The mRNA of SREBP-1c lipogenic target enzymes also fell. The mRNA of endogenous insig-1, but not -2a and -2b, was higher in the fatty livers of untreated obese ZDF (fa/fa) rats compared with controls, but the elevation was not sufficient to block the ≈3-fold increase in SREBP-1c expression and activity. In normal animals, adenovirus-induced overexpression of the insigs reduced the increase in SREBP-1c mRNA and its target enzymes caused by refeeding. The findings demonstrated that both insigs have antilipogenic action when transgenically overexpressed in livers with increased SREBP-1c-mediated lipogenesis. However, the increase in endogenous insig-1 expression associated with augmented lipogenesis may limit it, but is insufficient to prevent it. |
| Related Links | http://dx.doi.org/10.1073/pnas.0401715101 |
| Ending Page | 7111 |
| Page Count | 6 |
| Starting Page | 7106 |
| File Format | |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 101 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2004-05-04 |
| Access Restriction | Open |
| Rights Holder | National Academy of Sciences |
| Subject Keyword | General Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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