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      Effects of experimental conditions on the production of interleukin-1 alpha and -1 beta by human endothelial cells cultured in vitro.

      International journal of immunopharmacology

      Cells, Cultured, Culture Media, Endothelium, Vascular, cytology, metabolism, Humans, Immunoenzyme Techniques, Interleukin-1, analysis, biosynthesis

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          We have characterized the production of IL-1 alpha and -beta in primary and passaged cultures of quiescent human umbilical vein endothelial cells (HUVECs) using highly specific and sensitive solid-phase enzyme immunoassays. Primary cultures produced both immunoreactive IL-1 alpha and IL-1 beta following stimulation with lipopolysaccharide with the alpha form predominating over the beta. Most of the IL-1 produced remained cell-associated. Primary, but not passaged, cultures were significantly contaminated by macrophage-like cells, possibly accounting for higher production of IL-1, especially IL-1 beta. Gel filtration of secreted proteins derived from cultured HUVECs showed that the immunoreactive IL-1 alpha exhibited the expected molecular weight (17 kDa), but cell-associated IL-1s appeared to be a mixture of the 17 kDa protein and of higher molecular weight precursors. Mitogens in the culture medium (serum and endothelial cell growth supplement) were powerful stimuli of endothelial IL-1 production and accounted for the relatively high basal IL-1 levels observed in the cultured endothelial cells. The proliferative phenotype of the endothelium is possibly linked to the expression of high level of IL-1, which until now was thought to be an autocrine inhibitor of endothelial cell mitosis.

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