Immunosuppressor cells from newborn mouse spleen are macrophages differentiating in vitro from monoblastic precursors

European Journal of Immunology
P F PiguetP Vassalli

Abstract

Newborn mouse spleen, whose cells strongly suppress the in vitro humoral response of adult spleen cells, is essentially a hematopoietic organ. It contains a large percentage of proliferating cells, among which about 50% are erythroblasts (identified by their spectrin content) and about 15% are cells of the myelocytic and monocytic lineage. Lymphoid cells are a minority, with about 20% B and only 1-2% T lymphocytes. After a 4 days, a culture of newborn spleen cells contains 5-10 times more macrophages than that of an adult spleen. Most of these macrophage precursors from the newborn spleen are proliferating cells, partially glass- or plastic-adherent, which differentiate in culture into activated macrophages producing large amounts of plasminogen activator. It is this macrophage excess which is responsible for the immunosuppressive effect of newborn spleen cells in culture, as indicated by (a) the effect of silica particles added to the cultures, which both relieve the suppression and prevent the accumulation of macrophages and (b) the suppression of the humoral response of adult spleen cells when they are cultured on the adherent cells from a newborn but not from an adult spleen. The suppressive effect of macrophages seems to r...Continue Reading

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Related Concepts

Senility
Cell Differentiation Process
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