PMID:7690439

Citation	Ploemacher, RE, van Soest, PL, Boudewijn, A and Neben, S (1993) Interleukin-12 enhances interleukin-3 dependent multilineage hematopoietic colony formation stimulated by interleukin-11 or steel factor. Leukemia 7:1374-80
Abstract	Interleukin 12 (IL-12: natural killer cell stimulatory factor, NKSF; cytotoxic lymphocyte maturation factor, CLMF) was studied for its effect on colony formation and lineage expression of low-density bone marrow cells from 5-fluorouracil-treated mice, and of sorted stem cells using a semi-solid culture assay in the absence or presence of IL-3, IL-11, Steel factor (SF) and erythropoietin. IL-12 did not support colony formation as a single factor, nor in the presence of IL-11 or SF. In IL-3-containing cultures, IL-12 slightly enhanced neutrophilic and monocyte differentiation. Both SF and IL-11 synergized with IL-3 to increase the percentage of multilineage colonies and the number of colonies containing erythrocytes, megakaryocytes, neutrophils, eosinophils, monocytes/macrophages, and blast cells, but not mast cells. In the presence of IL-3 + IL-11, IL-12 greatly enhanced neutrophil, megakaryocyte, erythrocyte, and mast cell development. In IL-3 + SF-containing cultures, IL-12 further increased colony numbers and a higher percentage of colonies expressed neutrophilic, megakaryocytic, erythroid, monocytic, blast cell, and/or mast cell lineages. Colony size and the presence of eosinophils in colonies were unaffected by IL-12 addition. These effects of IL-12 could not be reversed by antibodies against interferon-gamma. Our data show that IL-12 may act as a synergistic factor, stimulating multilineage expression of hemopoietic stem cells, probably via a direct action. The observed activity of IL-12, however, required the presence of a least two factors, i.e. either IL-3 + IL-11, or IL-3 + SF.
Links	PubMed
Keywords	Animals; Colony-Forming Units Assay; Drug Synergism; Erythrocytes/cytology; Hematopoietic Cell Growth Factors/pharmacology; Hematopoietic Stem Cells/cytology; Interleukin-11/pharmacology; Interleukin-12; Interleukin-3/pharmacology; Interleukins/pharmacology; Leukocytes/cytology; Male; Megakaryocytes/cytology; Mice; Mice, Inbred C57BL; Mice, Inbred CBA; Monocytes/cytology; Stem Cell Factor
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