Biological properties in vitro of a combination of recombinant murine interleukin‐3 and granulocyte‐macrophage colony‐stimulating factor

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Abstract
The effect of recombinant murine interleukin‐3 (rIL‐3) and recombinant murine granulocyte‐macrophage colony‐stimulating factor (rGM‐CSF) on in vitro murine myeloid progenitor cell (CFU‐C) growth and on the function of murine resident peritoneal macrophages was investigated. both rIL‐3 and rGM‐CSF are known to support the growth of CFU‐C and, when combined, were found to act synergistically to induce the development of an increased number of CFU‐C. The distribution pattern of myeloid colonies in the presence of these two growth factors was in general similar to that in the presence of rGM‐CSF alone. both rGM‐CSF and rIL‐3 enhanced the phagocytosis of Candida albicans (CA) by mature macrophages producing an increase in the percentage of phagocytosing cells as well as an increase in the number of yeast particles ingested per cell. No additive effect on the phagocytosis was observed when the two growth factors were added concurrently. rGM‐CSF, but not rIL‐3, enhanced the killing of CA by macrophages. This killing was inhibited by scavengers of oxygen radicals.

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