Changes in heparan sulfate structure during transition from the proliferating to the non-dividing state of cultured arterial smooth muscle cells.
Cultured arterial smooth muscle cells synthesize a cell-associated heparan sulfate proteoglycan which consists of a 92 kDa core protein with 3 to 4 heparan sulfate side chains covalently attached. Biosynthesis of the cell-associated heparan sulfate proteoglycan was compared in proliferating and in non-dividing vascular smooth muscle cells which are preincubated in the presence of [35]sulfate or a combination of [35S]methionine and [3H]glucosamine. The Mr of the core protein was identical in either growth state, but changes in the structure of the heparan sulfate side chains were observed. Non-dividing (postconfluent) arterial smooth muscle cells form longer heparan sulfate chains with a higher proportion of hydrophobic (N-acetyl) groups than proliferating (preconfluent) cells as judged from gel filtration experiments, hydrophobic interaction chromatography and heparitinase degradation. An enzyme preparation from proliferating cells catalyzes deacetylation and N-sulfation of heparan sulfate at a 5-fold higher activity than from non-dividing cells. Cell density-dependent structural differences of heparan sulfate are related to the finding that heparan sulfate isolated from non-dividing cells has a 10-fold higher antiproliferative potency than heparan sulfate from proliferating (preconfluent) cells.
Schmidt
A
A
Institute of Arteriosclerosis Research, University of Münster, Federal Republic of Germany.
Buddecke
E
E
D000818:Animals; D001013:Aorta, Thoracic / Q000378:metabolism; D002417:Cattle; D002455:Cell Division / Q000502:physiology; D002462:Cell Membrane / Q000378:metabolism; D002478:Cells, Cultured; D011508:Chondroitin Sulfate Proteoglycans / Q000378:metabolism; D002853:Chromatography, Liquid; D019812:Heparan Sulfate Proteoglycans; D006497:Heparan Sulfate / Q000378:metabolism*; D009131:Muscle, Smooth, Vascular / Q000166:cytology / Q000201:enzymology / Q000378:metabolism*; D011506:Proteins / Q000302:isolation & purification; D015238:Sulfotransferases; D013466:Sulfurtransferases / Q000378:metabolism
D011508:Chondroitin Sulfate Proteoglycans; D019812:Heparan Sulfate Proteoglycans; D006497:Heparan Sulfate; D011506:Proteins; D015238:Sulfotransferases; D013466:Sulfurtransferases; C021350:heparitin sulfotransferase