Abstract
Although phosphatidylinositol 4,5-bisphosphate (PIP 2) regulates syndecan-4 function, the potential influence of syndecan-4 on PIP 2 remains unknown. GFP containing PIP 2-binding-PH domain of phospholipase Cδ (GFP-PHδ) was used to monitor PIP 2. Syndecan-4 overexpression in COS-7 cells enhanced membrane translocation of GFP-PHδ, while the opposite was observed when syndecan-4 was knocked-down. PIP 2 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 PIP 2 by negatively regulating PLC-dependent PIP 2 degradation.
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