title: Proteoglycans from human umbilical vein endothelial cells.
abstract: Human umbilical vein endothelial cells were incubated with [35S]sulphate and investigated for their proteoglycan production. By gel chromatography, ion-exchange chromatography and CsCl density-gradient centrifugation we obtained preparative amounts of the endothelial proteoheparan sulphate HSI and of proteochondroitin sulphate from the conditioned medium of mass-cultured human umbilical vein endothelial cells. Approximately 90% of the 35S-labeled material in the endothelial cell conditioned medium was proteochondroitin sulphate. This molecule, with a molecular mass of 180-200 kDa, contains four side-chains of 35-40 kDa and a core protein of 35-40 kDa. Two proteoheparan sulphate forms (HSI and HSII) from the conditioned medium were distinguished by molecular mass and transport kinetics from the cell layer to the medium in pulse-chase experiments. One major form (HSI), with an approximate molecular mass of 160-200 kDa a core protein of 55-60 kDa and three to four polysaccharide side-chains of 35 kDa each, was found enriched in the cellular membrane pellet. Another proteoheparan sulphate (HSII), with polysaccharide moieties of 20 kDa, is enriched in the subendothelial matrix (substratum).
mesh_terms: D000596:Amino Acids / Q000302:isolation & purification; D002241:Carbohydrates / Q000302:isolation & purification; D055598:Chemical Phenomena; D002621:Chemistry; D011508:Chondroitin Sulfate Proteoglycans / Q000145:classification / Q000302:isolation & purification*; D002845:Chromatography / Q000379:methods; D004730:Endothelium, Vascular / Q000032:analysis*; D005260:Female; D006025:Glycosaminoglycans / Q000302:isolation & purification*; D019812:Heparan Sulfate Proteoglycans; D006497:Heparan Sulfate / Q000145:classification / Q000302:isolation & purification*; D006801:Humans; D011509:Proteoglycans / Q000302:isolation & purification*; D014471:Umbilical Veins / Q000032:analysis*
chemical_list: D000596:Amino Acids; D002241:Carbohydrates; D011508:Chondroitin Sulfate Proteoglycans; D006025:Glycosaminoglycans; D019812:Heparan Sulfate Proteoglycans; D006497:Heparan Sulfate; D011509:Proteoglycans