Phenotypic changes in 3T3 cells associated with the change of sphingolipid synthesis by a ceramide analog, 2‐decanoylamino‐3‐morpholino‐1‐phenylpropanol (compound RV538)

Abstract

A culture of BALB/c 3T3 cells grown in the presence of 40 μM of the ceramide analog compound RV538 (2‐decanoylamino‐3‐morpholino‐1‐phenylpropanol) for several passages caused a substantial decrease in the level of all glycosphingolipids and an accumulation of ceramide and sphingomyelin. Associated with these chemical changes of sphingolipid composition and metabolism, the following phenotypic changes were observed: (i) loss of the cobblestone appearance at cell density saturation and development of fibroblastic appearance with partial overlapping of cells; (ii) reduction of cell growth rate; (iii) enhanced production of lactic acid; (iv) enhanced rate of glucose transport; and (v) higher incidence of large colony formation with infiltrating appearance in soft agar. Cell morphology changes, lactate pruduction, and enhanced sugar uptake were reversed by co‐culturing cells with gangliosides, particularly trisialogangliosides. Thus, these phenotypic changes mimicking those of oncogenically transformed cells are closely related to the blocked synthesis of glycolipids in these cells, whereas other changes may be caused by an accumulation of ceramide and sphingomyelin.