| Abstract: | Glycosaminoglycans of cultured nickel-induced rat rhabdomyosarcoma cell lines with different metastatic potentials and of non-malignant myoblasts, grown in the presence or in the absence of hydrocortisone, were studied comparatively. The newly formed 3H]glucosamine-labelled cell surface proteoglycans and glycosaminoglycans were separated by ion exchange chromatography and partially characterized. The overall incorporation of the label in the glycosaminoglycan fractions and the average molecular weight of the heparan and of the chondroitin sulfate proteoglycans was lower in the malignant cells than in the non-malignant L6 myoblasts. The strongly metastatic 9-4/0 parental line and the 6 subline were relatively richer in chondroitin sulfate and poorer in dermatan sulfate labels than the very weakly metastatic 8 subline and the L6 myoblasts. Hyaluronic acid and heparan sulfate labels were inversely related to the metastatic capacity of the cell lines studied. Hydrocortisone treatment induced an increase in the cell surface chondroitin and dermatan sulfate labels in the case of the strongly metastatic lines, and a decrease of the same parameters in the case of the weakly metastatic 8 line. |
