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The Journal of Immunology, Vol 138, Issue 12 4288-4292, Copyright © 1987 by American Association of Immunologists

ARTICLES

Growth of an interleukin 2/interleukin 4-dependent T cell line induced by granulocyte-macrophage colony-stimulating factor (GM-CSF)

T Kupper, P Flood, D Coleman and M Horowitz

Lymphokine activities in conditioned medium from activated helper T cell lines are most commonly defined by the proliferation of "specific" lymphokine-dependent cell lines. Various sublines of IL 2-dependent (and ostensibly specific) HT-2 and CTLL cells have now been shown to proliferate in response to BSF-1/IL 4 as well. After activation with antigen or mitogen, D10.G4.1, an antigen-specific cloned T helper cell that has recently been shown to produce IL 4 but not IL 2, secretes two distinct cytokines that induce the growth of HT-2 cells. These "T cell growth factors" (TCGF) can be separated by reversed phase high- performance liquid chromatography (RP-HPLC). The TCGF activity of one of these factors can be blocked by 11B11, an antibody specific for IL 4. The second TCGF activity is not affected by 11B11 or by antibodies specific for IL 2. This TCGF activity can be neutralized by a goat polyclonal antibody to granulocyte-macrophage colony-stimulating factor (GM-CSF), and has a RP-HPLC elution profile identical to that of recombinant GM-CSF. Recombinant GM-CSF induces both proliferation and long-term growth of HT-2 but not CTLL cells, and this activity can be neutralized by the same antibody to GM-CSF. GM-CSF is best known as a factor that induces the maturation and growth of granulocytes and macrophages from bone marrow-derived hematopoietic precursor cells. The ability of GM-CSF to induce the growth of certain T cell lines indicates that this molecule may play a role in T cell-mediated immune responses, either as an autocrine growth factor or a paracrine stimulus from both lymphoid and nonlymphoid tissues that produce this cytokine.


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