Granulocyte macrophage colony-stimulating activity production by cultured human thymic nonlymphoid cells is regulated by endogenous interleukin-1

D. Ridgway, M. S. Borzy, G. C. Bagby

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Supernatants of cultured human thymic nonlymphoid cells were assayed for granulopoietic factors using cultures of low density bone marrow mononuclear cells (LD-BMMC). Thymic nonlymphoid cell-conditioned medium (TNLC-CM) supported vigorous myeloid colony growth of LD-BMMC, and of LD-BMMC depleted of T lymphocytes and/or monocytes. Colony stimulating activity (CSA) in TNLC-CM was abrogated by a highly specific neutralizing antiserum against recombinant human granulocyte-macrophage colony-stimulating factor (GM-CSF). TNLC-CM also enhanced colony growth in LD-BMMC stimulated by colony stimulating activity from a giant cell tumor culture (GCT). The enhancing activity of TNLC-CM, unlike its CSA activity, required the presence of adherent cells in the marrow cell culture. The addition of anti-interleukin-1 (anti-IL-1) anti-body to TNLC-CM inhibited the GCT-enhancing activity, but not the CSA. When the anti-IL-1 immunoglobulin was added directly to cultures of thymic nonlymphoid cells, GM-CSF production was completely inhibited, and the GCT enhancing activity was neutralized. We conclude that an intercellular regulatory network exists in cultured thymic explants in which GM-CSF expression is induced by IL-1. In this system, the granulopoietic effect of IL-1 derives not from a direct effect on myeloid progenitors, but from its ability to recruit CSA production by other cells.

    Original languageEnglish (US)
    Pages (from-to)1230-1236
    Number of pages7
    JournalBlood
    Volume72
    Issue number4
    StatePublished - 1988

    Fingerprint

    Macrophages
    Conditioned Culture Medium
    Interleukin-1
    Granulocytes
    Bone
    Granulocyte-Macrophage Colony-Stimulating Factor
    Tumors
    Giant Cell Tumors
    Bone Marrow Cells
    Cell culture
    Cell Culture Techniques
    T-cells
    Immunoglobulins
    Immune Sera
    Growth
    Monocytes
    Cell Count
    Bone Marrow
    T-Lymphocytes

    ASJC Scopus subject areas

    • Hematology

    Cite this

    Granulocyte macrophage colony-stimulating activity production by cultured human thymic nonlymphoid cells is regulated by endogenous interleukin-1. / Ridgway, D.; Borzy, M. S.; Bagby, G. C.

    In: Blood, Vol. 72, No. 4, 1988, p. 1230-1236.

    Research output: Contribution to journalArticle

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