Abstract
Production of human granulocyte colony stimulating factor (G-CSF) by stromal cells was studied in vitro. Induction of G-CSF by interleukin 1 (IL-1) and lipopolysaccharide (LPS) was compared using enzyme immunoassay in various kinds of stromal cells. Primary human bone marrow stromal cells, a human bone marrow-derived stromal cell line (KM-102), and peripheral blood monocytes secreted small amounts of G-CSF without stimulation, while vascular endothelial cells and skin fibroblasts secreted G-CSF only when induced by IL-1 or LPS. The production of G-CSF by monocytes was stimulated predominantly by LPS, whereas that by KM-102 cells, endothelial cells, and fibroblasts was induced by IL-1 but much less so by LPS. IL-1 and LPS stimulated similar levels of G-CSF production by primary bone marrow stromal cells which consisted of various types of cells. In situ hybridization for G-CSF mRNA showed that only a small proportion of primary bone marrow stromal cells expressed a large amount of G-CSF mRNA upon stimulation. The positive cells were round or oval in shape, while most of the spindle-shaped stromal cells were negative for specific grains. Although further characterization of positive cells is needed, the results suggest that bone ...Continue Reading
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