Syndecan-4 promotes the retention of phosphatidylinositol 4,5-bisphosphate in the plasma membrane

Soojin Kwon, Hyowon Son, Youngsil Choi, Jung hyun Lee, Sojoong Choi, Yangmi Lim, Inn Oc Han, Eok Soo Oh

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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.

Original languageEnglish
Pages (from-to)2395-2400
Number of pages6
JournalFEBS Letters
Issue number14
StatePublished - 21 Jul 2009


  • Adhesion
  • Phosphatidylinositol 4,5-bisphosphate
  • Signal transduction
  • Syndecan


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