Molecular basis of interaction between NG2 proteoglycan and galectin-3

Yunfei Wen, Irwan T. Makagiansar, Jun Ichi Fukushi, Fu Tong Liu, Michiko N. Fukuda, William B. Stallcup

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Previous work has demonstrated the ability of the NG2 proteoglycan, a component of microvascular pericytes, to stimulate endothelial cell motility and morphogenesis. This function of NG2 depends on formation of a complex with galectin-3 and α3β1 integrin to stimulate integrin-mediated transmembrane signaling. In addition, the co-expression of galectin-3 and NG2 in A375 melanoma cells suggests that the malignant properties of these cells may be affected by interaction between the two molecules. Here, we extend the theme of co-expression and interaction of NG2 and galectin-3 to human glioma cells. We also establish a molecular basis for the NG2/galectin-3 interaction. The C-terminal carbohydrate recognition domain of galectin-3 is responsible for binding to the NG2 core protein. Within the NG2 extracellular domain, the membrane-proximal D3 segment of the proteoglycan contains the primary binding site for interaction with galectin-3. The interaction between galectin-3 and NG2 is a carbohydrate-dependent one mediated by N-linked rather than O-linked oligosaccharides within the D3 domain of the NG2 core protein. These studies establish a foundation for attempts to reduce the aggressive properties of tumor cells by disrupting the NG2/galectin-3 interaction.

Original languageEnglish
Pages (from-to)115-127
Number of pages13
JournalJournal of Cellular Biochemistry
Volume98
Issue number1
DOIs
Publication statusPublished - May 1 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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