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The Journal of Immunology, Vol 143, Issue 7 2311-2316, Copyright © 1989 by American Association of Immunologists
ARTICLES |
ME Rothenberg, J Petersen, RL Stevens, DS Silberstein, DT McKenzie, KF Austen and WF Owen Jr
Department of Medicine, Harvard Medical School, Boston, MA 02115.
Human peripheral blood-derived eosinophils were assessed for their viability, density, and functional properties after 7 days of culture with purified mouse IL-5 and mouse 3T3 fibroblasts. Whereas none of the eosinophils remained viable after 7 days of culture in the absence of IL-5, 38 +/- 12% and 61 +/- 14% (n = 6, mean +/- SD) of the eosinophils survived in the presence of 1 pM IL-5 alone or 1 pM IL-5 in the presence of 3T3 fibroblasts, respectively (p less than 0.05). Direct contact between the fibroblasts and the eosinophils was not needed for this enhanced IL-5-dependent viability. After 7 days, 66 +/- 7% (n = 6) of the cocultured eosinophils were viable when the two cell types were separated by a 0.4-microns filter. As assessed by density-gradient centrifugation after 7 days of IL-5 exposure, all of the original normodense eosinophils became hypodense. The time course of this conversion was accelerated by the presence of 3T3 fibroblasts. Enhanced helminthic cytotoxicity was maintained by the 7-day cultured eosinophils only if they had been cocultured with fibroblasts. Eosinophils killed 10 +/- 11% (n = 5), 48 +/- 17%, and 31 +/- 15% of the larvae when they were cultured for 7 days in IL-5 alone, in IL-5 in direct contact with 3T3 fibroblasts, or in IL-5 with filter separation of the fibroblasts and the eosinophils, respectively. The ability of IL- 5 to induce progenitor cells to differentiate selectively into eosinophils, and of 3T3 fibroblasts to facilitate the IL-5-mediated conversion of normodense eosinophils to hypodense eosinophils with increased viability and antibody-dependent cytotoxicity suggests a role for both hematopoietic and tissue factors in determining the presence and pathobiologic function of activated hypodense eosinophils in patients with hypereosinophilic conditions.
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