Fusion of SV40-induced endocytotic vacuoles with the nuclear membrane.
The interaction between simian virus 40(SV40)-induced endocytotic vacuoles and the nuclear membrane was investigated using cationized ferritin (CF) and concanavalin A (Con A) as cell membrane markers. These markers bound to the cell surfaces of CV-1 cells together with SV40 at 4 degrees C. Following incubation of these modified cells at 37 degrees C in serum-free medium, the cell membranes showed many invaginations. After incubation for 60 min at 37 degrees C in the same medium, many various-sized vacuoles were present that contained membrane-bound CF, Con A and SV40. After 2 h of incubation at 37 degrees C, Con A was present in some areas of the perinuclear cisterna along the nuclear membrane. The control experiment, however, showed no localization of Con A-binding on the nuclear membrane. These results provide evidence that SV40-induced endocytotic vacuoles migrate toward the nucleus and fuse with its membrane.
D000818:Animals; D002460:Cell Line; D002462:Cell Membrane / Q000648:ultrastructure; D002472:Cell Transformation, Viral; D002522:Chlorocebus aethiops; D003208:Concanavalin A; D004705:Endocytosis; D005293:Ferritins; D006735:Horseradish Peroxidase; D007668:Kidney; D008854:Microscopy, Electron; D009685:Nuclear Envelope / Q000502:physiology / Q000648:ultrastructure*; D009940:Organoids / Q000648:ultrastructure*; D013539:Simian virus 40 / Q000235:genetics*; D014617:Vacuoles / Q000502:physiology / Q000648:ultrastructure*
D003208:Concanavalin A; D005293:Ferritins; D006735:Horseradish Peroxidase