A plasma membrane-associated phospholipase in SV40-transformed 3T3 cells

Vinblastine-induced formation of annulated lamellae in SV3T3 cells

SV40-transformed 3T3 cells formed microtubular crystals in the cytoplasm when treated with vinblastine sulfate. Annulated lamellae, an unusual intracellular organelle found in some actively proliferating cell types, appeared concurrently with the formation of microtubular crystals. Although crystals were also seen in non-transformed 3T3 cells treated with vinblastine, annulated lamellae were not found.

Phospholipase activity in human tumors: localization by cytochemical staining

Phospholipase activity was localized for the first time by cytochemical staining at the plasma membrane of malignant cells in gastric adenocarcinomas by electron microscopy. This activity was not found in benign cells of the same tumor, e.g., in components of the connective tissue underlying the glandular epithelium, or in cells beyond the margin of the same tumor. Neither benign nor malignant cells of colorectal tumors, nor those in malignant melanoma, had any phospholipase activity that could be demonstrated by the method.