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Comparative effects of 7 beta-hydroxycholesterol towards murine lymphomas, lymphoblasts and lymphocytes: selective cytotoxicity and blastogenesis inhibition.

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The effects of 7 beta-hydroxycholesterol on lymphoma cells in culture, on lymphocytes entering blastic transformation and on quiescent murine spleen lymphocytes have been investigated. The early events of blastogenesis as well as YAC-1, RDM-4 and EL-4 cells were shown to be very sensitive to this sterol at microM concentration, whereas constituted lymphoblasts and normal lymphocytes remained insensitive at 50 times higher concentration. The effect of some classical antitumor drugs (Adriamycin, Mitomycin-C, Methotrexate) on these lymphoma cells were of the same order of magnitude. However, the activity of 7 beta-hydroxycholesterol was closely related to the composition of the culture medium. Indeed, the cytotoxic effects of this compound were less in medium supplemented with foetal calf serum than in lipoprotein poor, Ultroser-G supplemented medium. The possible impairment of the same, or closely related, events occurring in blastic transformation and in rapid proliferation of cells is pointed out. Our results raise the question of the possible use of these compounds for an antitumor strategy.

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