GM-CSF is required for the Pseudomonas exotoxin A-induced proliferation of immature T cells in athymic mice.
Previous studies have demonstrated that Pseudomonas exotoxin A stimulated the proliferation of immature T lymphocytes within the splenocytes of athymic mice. These studies were performed to determine which lymphokines were involved in the proliferation of the immature T cells. The results of this study indicate that exotoxin A does not induce the production of interleukin-2 or tumor necrosis factor from B cell-depleted splenotypes from athymic mice. However, exotoxin A does induce the production of granulocyte-macrophage colony-stimulating factor (GM-CSF) from B cell-depleted splenocytes. Furthermore, the GM-CSF was shown to be produced by a Thy1+, CD4-, CD8- T lymphocyte. The addition of anti-GM-CSF antibody abrogates the exotoxin A-induced proliferation of B cell-depleted splenocytes from athymic mice. Thus, these data indicate that exotoxin A induces the production of GM-CSF from immature T lymphocytes within the splenocytes of athymic mice and the exotoxin A-induced proliferation of these immature T cells is dependent on the presence of GM-CSF.
Department of Biology, Southeastern Oklahoma State University, Durant 74701.
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Dixon
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Misfeldt
D036002:ADP Ribose Transferases; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D001427:Bacterial Toxins; D002454:Cell Differentiation / Q000276:immunology; D005098:Exotoxins / Q000276:immunology*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000096:biosynthesis / Q000502:physiology*; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D008819:Mice, Nude; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology*; D018800:Thy-1 Antigens / Q000276:immunology; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis; D037521:Virulence Factors; D000097668:Pseudomonas aeruginosa Exotoxin A
D036002:ADP Ribose Transferases; D000911:Antibodies, Monoclonal; D001427:Bacterial Toxins; D005098:Exotoxins; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D007376:Interleukin-2; D018800:Thy-1 Antigens; D014409:Tumor Necrosis Factor-alpha; D037521:Virulence Factors; D000097668:Pseudomonas aeruginosa Exotoxin A