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  • Title: Effects of a murine mammary tumor on in vivo and in vitro hemopoiesis.
    Author: Johnson GR, Whitehead R, Nicola NA.
    Journal: Int J Cell Cloning; 1985 Mar; 3(2):91-105. PubMed ID: 3873504.
    Abstract:
    The effects of an autologous transplanted mammary tumor (RIII-T3) on hemopoiesis in RIII mice are described. Tumor-bearing animals died 30 to 40 days after inoculation and displayed splenomegaly, extreme neutrophilia, and moderately increased monocyte levels in the spleen, peripheral blood, and bone marrow. The precursors of neutrophils and monocytes, granulocyte/macrophage colony-forming cells (GM-CFC) were elevated in the spleen, bone marrow, and peripheral blood. RIII-T3-conditioned medium stimulated bone marrow GM-CFC and caused the myelomonocytic cell line, WEHI-3B, to differentiate in vitro. The conditioned medium did not stimulate erythroid, megakaryocyte, or eosinophil colony formation. When conditioned medium was fractionated, two peaks of activity corresponding to GM-CSF and G-CSF were observed, suggesting that the extreme neutrophilia observed in tumor-bearing animals may result from chronic exposure of the hemopoietic system to these hemopoietic hormones.
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