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- W2414985043 abstract "The effect of the chemical carcinogen dimethylbenzanthracene (DMBA) on cellular immunity was studied at a 6-mg dose which induces adenocarcinomas and adenoacanthomas in more than 70% of BalB/c mice within 1 year after administration. DMBA caused a significant reduction of splenic natural killer (NK) activity and responsiveness to alloantigens in mixed lymphocyte reactions (MLR). These activities decreased soon after the carcinogen treatment and remained suppressed during the entire tumor induction period. There was a linear correlation between the reduction in NK activity and a selective decrease in the number of asialo GM1 positive cells in the spleen. However, cell sorting experiments using the flow cytometer have shown that the lytic activity per cell of asialo GM-1 positive cells in untreated mice and in DMBA-treated ones was similar. There was no correlation between the suppressed response of the T cells in MLR and the percentage of T cell subpopulations residing in the spleen of the DMBA-treated mice. The decrease in the number of NK cells and the reduced MLR activity in the spleen occurred simultaneously with a decrease in the potential of bone marrow precursor cells to reconstitute NK and MLR activity in the spleen of lethally irradiated mice. These results indicate that the carcinogen DMBA effects the immune system at various levels and either eliminates or inactivates precursor cells as well as mature lymphoid cells." @default.
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- W2414985043 date "1986-01-01" @default.
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- W2414985043 title "Marker and function analysis of natural killer and alloreactive T cells during early stages of dimethylbenzanthracene carcinogenesis. The immunity system during the precancer period." @default.
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