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Adaptation of Zajdela ascitic hepatoma cells to monolayer growth: change in the cell ganglioside pattern.

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The Zajdela hepatoma is a transplantable ascitic tumor of the rat, characterized by a very simple ganglioside pattern, GM3 being the main compound. When these cells are adapted to monolayer culture, they undergo a maturation process and the total cellular ganglioside concentration increases progressively; GM2, GM1 and GD3 amounts rose and GD1a accumulated. These modifications in the ganglioside pattern complexity are not affected by the addition of ascitic fluid to the cultures, nor by growth in serum free, hormone-supplemented medium. They are totally reversible when the cultured hepatoma cells are reinjected into a rat and developed an ascitic tumour. Cell growth control and adhesion processes could be related to the maturation process of these hepatoma cells growing in monolayer, which may constitute a convenient model for further investigations on the regulation of membrane glycolipid composition by the external environment.

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