Deletion of complex gangliosides of human glioma cells during mitotic cell division.

Glycolipid compositions of the human glioma cell line T98G were studied during each phase of the cell cycle to see if those cell surface molecules are concerned with cell proliferation. In vitro cultured non-synchronized T98G cells are composed of ceramidemonohexoside (CMH), ceramidedihexoside (CDH), ceramidetrihexoside (CTH) and neolactotetraosylceramide (nLc4Cer) as neutral glycolipids, and of sulfatide (CS), gangliosides GM3, GM2, GD1a and several other gangliosides as acidic ones. While total glycolipid content per cellular weight was shown to be increased during the M phase, deletion of complex gangliosides particularly b-series gangliosides was recognized (p < 0.05). The glycolipid profile in other phases was fairly consistent, and there was no glycolipid molecule specific to a certain phase of the cell cycle. Relative enhancement of simple gangliosides with a decrease of complex ones during mitotic division may imply the functional involvement of complex gangliosides in cell-cell or cell-matrix attachment, which may have to be abandoned during the process of detachment from the matrix or cellular cleavage.