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Integral membrane heparan sulfate proteoglycans

G David1

  • 1Center for Human Genetics, University of Leuven, Belgium.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|August 1, 1993
PubMed
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Heparan sulfate is a regulatory polysaccharide that controls cell growth and interactions. It is anchored to cell surfaces by novel proteoglycans, syndecan-like integral membrane proteoglycans (SLIPS) and glypican-related integral membrane proteoglycans (GRIPS).

Area of Science:

  • Biochemistry
  • Cell Biology
  • Developmental Biology

Background:

  • Heparan sulfate (HS) is a crucial regulatory polysaccharide involved in cell signaling.
  • HS modulates growth factor-receptor interactions, proteinase-inhibitor complex formation, and cell surface interactions with enzymes and structural proteins.
  • HS is abundant on embryonic cell surfaces, defining morphogenetic boundaries.

Purpose of the Study:

  • To identify and characterize the molecular families of integral membrane proteins that anchor cell surface heparan sulfate.
  • To investigate the differential expression and functional contexts of these proteoglycans.

Main Methods:

  • Identification of novel molecular families of integral membrane proteoglycans.
  • Characterization of syndecan-like integral membrane proteoglycans (SLIPS) and glypican-related integral membrane proteoglycans (GRIPS).

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Main Results:

  • Two novel molecular families of cell surface proteoglycans anchor heparan sulfate: SLIPS and GRIPS.
  • SLIPS have transmembrane core proteins with conserved cytoplasmic domains.
  • GRIPS are linked to the cell surface via glycosyl phosphatidylinositol and exhibit differential expression and turnover patterns.

Conclusions:

  • Cell surface proteoglycans (SLIPS and GRIPS) function in specific contexts to transduce signals from the interplay of matrix components, growth factors, and proteinases.
  • These proteoglycans are subject to strict developmental controls, suggesting specific roles in cellular processes.
  • The differential expression and localization of these proteoglycans highlight their specialized functions in distinct cell types and membrane domains.