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  • Title: Microfluorometry of nuclear acridine orange metachromasia in lymphocytes of thymus, spleen, and blood of AKR and random-bred mice.
    Author: Alvarez MR.
    Journal: Cancer Res; 1976 Mar; 36(3):895-900. PubMed ID: 56232.
    Abstract:
    Lymphocyte chromatin lability to acid hyrolysis was studied using acridine orange fluorescence metachromasia in a high-lymphocytic-leukemia-susceptibility strain (AKR) and random-bred mice (ICR). Comparisons were made of blood, thymus, and spleen lymphocytes between random-bred, "normal" AKR, and leukemic AKR animals. The leukemic mice were in the stages of the disease characterized by enlarged thymus and spleen but preceding massive elevation of blood lymphocytes. The ranges of the mean chromatin acid lability overlapped and were nearly identical in peripheral blood lymphocytes. However, thymic and splenic lymphocytes showed a marked rise in mean chromatic acid lability in the leukemic animals. The ranges of the mean values of this parameter were also found to be far greater in the lymphopoietic organs of normal AKR than in the random-bred mice. The data indicate that anatomically normal AKR animals of an age in which they are highly susceptible to spontaneous lymphocytic leukemia may contain a greater number of lymphoblasts in both the spleen and the thymus than do comparable random-bred mice. The implications of these findings are discussed in relation to strain differences and the concept of thymic origin of lymphocytic leukemia in mice.
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