Tonevitsky A G, Zhukova O S, Mirimanova N V, Omelyanenko V G, Timofeeva N V, Bergelson L D
Cardiological Research Center, USSR Academy of Medical Sciences, Moscow.
FEBS Lett. 1990 May 21;264(2):249-52. doi: 10.1016/0014-5793(90)80260-p.
The only gangliosides in Burkitt's lymphoma EB-3 cells is GM3. Treatment of Burkitt's lymphoma EB-3 cells with gangliosides GM1 or GM3 results in their binding to and partial incorporation into the cell membrane. About 25% of cell-associated ganglioside GM1 can interact with the ricin. However, such an increase in the number of binding sites does not enhance but rather decreases the cytotoxic effect of ricin. A similar protective effect was observed when the cells were pretreated with ganglioside GM3. In contrast, the increase in ricin biding sites caused by pretreatment of the cells with neuraminidase was accompanied by increase in ricin cytotoxicity. These differences may be related to observed differences in the rate of ricin-endocytosis by native and ganglioside-treated cells.
