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Syndecan-4 promotes the retention of phosphatidylinositol 4,5-bisphosphate in the plasma membrane
- Syndecan-4 promotes the retention of phosphatidylinositol 4,5-bisphosphate in the plasma membrane
- Kwon S.; Son H.; Choi Y.; Lee J.-h.; Choi S.; Lim Y.; Han I.-O.; Oh E.-S.
- Ewha Authors
- 오억수; 이정현
- SCOPUS Author ID
- Issue Date
- Journal Title
- FEBS Letters
- vol. 583, no. 14, pp. 2395 - 2400
- SCI; SCIE; SCOPUS
- Although phosphatidylinositol 4,5-bisphosphate (PIP2) regulates syndecan-4 function, the potential influence of syndecan-4 on PIP2 remains unknown. GFP containing PIP2-binding-PH domain of phospholipase Cδ (GFP-PHδ) was used to monitor PIP2. Syndecan-4 overexpression in COS-7 cells enhanced membrane translocation of GFP-PHδ, while the opposite was observed when syndecan-4 was knocked-down. PIP2 levels were higher in total phospholipids extracted from rat embryo fibroblasts expressing syndecan-4. Syndecan-4-induced membrane targeting of GFP-PHδ was further enhanced by phosphoinositide-3-kinase inhibitor, but not by phospholipase C (PLC) inhibitor. Besides, both ionomycin and epidermal growth factor caused dissociation of GFP-PHδ from plasma membrane, an effect that was significantly delayed by syndecan-4 over-expression. Collectively, these data suggest that syndecan-4 promotes plasma membrane retention of PIP2 by negatively regulating PLC-dependent PIP2 degradation. © 2009 Federation of European Biochemical Societies.
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