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Modulation of vascular endothelial cell growth by basement membrane heparan sulfate was investigated using four lines of normal and transformed cells. The growth of transformed endothelial cells, but not normal cells, on reconstituted basement membrane was severely suppressed when heparan sulfate, one of the components of the membrane, was specifically degraded by an enzyme, heparitinase. Similarly, when cells were grown on surfaces coated with heparan sulfate, as little as 60 pg/cm2 of heparan sulfate caused growth enhancement of transformed cells, but suppression of normal cells. These results together with our previous observations (IMAMURA, T and MITSUI, Y. (1987) Exp. Cell Res., 172: 92-100) argue that transformed cells have reversed a mechanism by which basement membrane heparan sulfate functions as a physiological suppressor for the growth of normal endothelial cells.

Contact with Basement Membrane Heparan Sulfate Enhances the Growth of Transformed Vascular Endothelial Cells, but Suppresses Normal Cells.