| First Author | Huo H | Year | 2003 |
| Journal | J Biol Chem | Volume | 278 |
| Issue | 13 | Pages | 11561-9 |
| PubMed ID | 12538586 | Mgi Jnum | J:82575 |
| Mgi Id | MGI:2653705 | Doi | 10.1074/jbc.M211785200 |
| Citation | Huo H, et al. (2003) Lipid rafts/caveolae are essential for insulin-like growth factor-1 receptor signaling during 3T3-L1 preadipocyte differentiation induction. J Biol Chem 278(13):11561-9 |
| abstractText | Lipid rafts/caveolae are found to be essential for insulin-like growth factor (IGF)-1 receptor signaling during 3T3-L1 preadipocyte differentiation induction. In 3T3-L1 cells, IGF-1 receptor is located in lipid rafts/caveolae of the plasma membrane and can directly interact with caveolin-1, the major protein component in caveolae. Disruption of lipid rafts/caveolae by depleting cellular cholesterol with cholesterol-binding reagent, beta-methylcyclodextrin or filipin, blocks the IGF-1 receptor signaling in 3T3-L1 preadipocyte. Both hormonal induced adipocyte differentiation and mitotic clonal expansion are inhibited by lipid rafts/caveolae disruption. However, a nonspecific lipid binding reagent, xylazine, does not affect adipocyte differentiation or mitotic clonal expansion. Further studies indicate that lipid rafts/caveolae are required only for IGF-1 receptor downstream signaling and not the activation of receptor itself by ligand. Thus, our results suggest that localization in lipid rafts/caveolae and association with caveolin enable IGF-1 receptor to have a close contact with downstream signal molecules recruited into lipid rafts/caveolae and transmit the signal through these signal molecule complexes. |
