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Blood monocytes from patients with sarcoidosis were incubated in vitro, and secretion of endogenous pyrogen (EP), the protein which mediates fever, and lysozyme (L) were measured. After incubation with endotoxin, monocytes from 5 patients with sarcoidosis released twice as much EP as did monocytes from normal individuals (p < .001). Initial 24-hr secretion of L by monocytes from 6 of 11 additional patients with sarcoidosis exceeded the normal range of values for cells from 11 age- and sex-matched control individuals. Cells with initially augmented secretion rates continued to secrete increased amounts of L for 3 days. A correlation was noted between in vitro secretion of L by monocytes and serum levels of L in the same patient. These studies indicate that circulating mononuclear cells in some patients with sarcoidosis have an increased capacity to secrete EP and/or L prior to tissue localization.
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