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. 1990 Mar;69(3):402–408.

Differential effects of LPS, IFN-gamma and TNF alpha on the secretion of lysozyme by individual human mononuclear phagocytes: relationship to cell maturity.

C E Lewis 1, S P McCarthy 1, J Lorenzen 1, J O McGee 1
PMCID: PMC1385959  PMID: 2107146

Abstract

Human mononuclear phagocytes can be activated to perform a variety of complex functions by exposure to the immunomodulators, lipopolysaccharide (LPS), interferon-gamma (IFN-gamma) and tumour necrosis factor alpha (TNF alpha). Although such activation often involves the release of various cytokines by monocytes and macrophages, little is known of the effects of such signals on their secretion of lysozyme (LZM). In this study, a reverse haemolytic plaque assay for LZM secretion is coupled with immunocytochemistry for the pan macrophage (CD68) marker, EBM/11. This enabled the direct effects of LPS, IFN-gamma and TNF alpha on the secretion of LZM by individual, immunoidentified human mononuclear phagocytes to be investigated. The overall secretion of this peptide by populations of freshly isolated or 3-day cultured monocytes was augmented by exposure for 6 hr to bacterial LPS, recombinant human IFN-gamma or recombinant human TNF alpha. Extension of the culture period for monocytes from 3 to 7 days prior to use in the assay resulted in higher levels of LZM secretion, which could be further increased by TNF alpha but not by LPS or IFN-gamma. Individual peritoneal macrophages activated by inflammation in vivo were uniform in their augmented LZM responses to TNF alpha, but a small subpopulation of human peritoneal macrophages, which may represent younger 'inflammatory' exudate macrophages, was seen to be preferentially responsive to the LZM-stimulating effects of LPS and IFN-gamma. These studies suggest that (i) secretion of LZM by human mononuclear phagocytes can be regulated by LPS and IFN-gamma, although the effects of these agents may be dependent upon the state of maturation and/or differentiation of the cells, and (ii) TNF alpha is a potent stimulant of LZM secretion by monocytes and macrophages irrespective of cell maturity.

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Selected References

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