View : 208 Download: 274
Sterol Regulatory Element-binding Protein (SREBP)-1-mediated lipogenesis is involved in cell senescence
- Sterol Regulatory Element-binding Protein (SREBP)-1-mediated lipogenesis is involved in cell senescence
- Kim Y.-M.; Shin H.-T.; Seo Y.-H.; Byun H.-O.; Yoon S.-H.; Lee I.-K.; Hyun D.-H.; Chung H.-Y.; Yoon G.
- Ewha Authors
- SCOPUS Author ID
- Issue Date
- Journal Title
- Journal of Biological Chemistry
- Journal of Biological Chemistry vol. 285, no. 38, pp. 29069 - 29077
- SCI; SCIE; SCOPUS
- Document Type
Show the fulltext
- Increased cell mass is one of the characteristics of senescent cells, but this event has not been clearly defined. When subcellular organellar mass was estimated with organelle-specific fluorescence dyes, we observed that most membranous organelles progressively increase in mass during cell senescence. This increase was accompanied by an increase in membrane lipids and augmented expression of lipogenic enzymes, such as fatty acid synthase (FAS), ATP citrate lyase, and acetyl-CoA carboxylase. The mature form of sterol regulatory element-binding protein (SREBP)-1 was also elevated. Increased expression of these lipogenic effectors was further observed in the liver tissues of aging Fischer 344 rats. Ectopic expression of mature form of SREBP-1 in both Chang cells and primary young human diploid fibroblasts was enough to induce senescence. Blocking lipogenesis with FAS inhibitors (cerulenin and C75) and via siRNA-mediated silencing of SREBP-1 and ATP citrate lyase significantly attenuated H2O2-induced senescence. Finally, old human diploid fibroblasts were effectively reversed to young-like cells by challenging with FAS inhibitors. Our results suggest that enhanced lipogenesis is not only a common event, but also critically involved in senescence via SREBP-1 induction, thereby contributing to the increase in organelle mass (as a part of cell mass), a novel indicator of senescence. © 2010 by The American Society for Biochemistry and Molecular Biology, Inc.
- Appears in Collections:
- 자연과학대학 > 생명과학전공 > Journal papers
- Files in This Item:
Sterol Regulatory Element-binding Protein (SREBP)-1-mediated Lipogenesis Is Involved in Cell Senescence.pdf(2.65 MB)
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.