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Profound changes in the level of certain dehydrogenase enzymes were observed in lymphoid tissues of rats involved by erythroblastic stem cell leukaemia. In lymphoid tissues free of leukaemic involvement, activity of malate dehydrogenase (MDH) always exceeded that of lactate dehydrogenase (LDH). In those which contained substantial infiltrates of leukaemic cells, activity of LDH was increased while MDH activity was reduced. In leukaemic spleen significant changes were observed in the molecular forms of LDH; the proportion of LDH-5 (muscle-type LDH) was greatly increased while the other molecular forms were reduced. The spleen of rats with leukaemia exhibited a marked increase in the normal level of aerobic and anaerobic glycolysis but the rate of respiration was unchanged.The terminal stages of stem cell leukaemia in the rat are characterized by wide-spread leukaemic infiltration of liver and other tissues. Lymph node involvement, however, was found to be selective. Coeliac lymph nodes greatly exceeded other lymph node groups in their incidence of leukaemic involvement. It is considered that the selective nature of lymph node involvement in stem cell leukaemia derives from topographical considerations.

Leukaemia Evoked with 7,8,12-Trimethylbenz(a)Anthracene in Rat. III. Changes in Lymphoid Tissues