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- W1489352253 abstract "Abstract Mononuclear phagocytes have the capacity to directly participate in extracellular matrix turnover via secretion of neutral proteinases. We have studied the effects of in vivo and in vitro differentiation upon cellular content or secretion of a spectrum of neutral proteinases, along with a counter-regulatory metalloproteinase inhibitor (TIMP). We found 1) matrix-degradative serine proteinases (leukocyte elastase and cathepsin G) were lost during cellular maturation and/or differentiation; 2) the 92-kDa type IV/type V collagenase and TIMP were secreted earliest in mononuclear phagocyte differentiation, whereas stromelysin secretion was observed only by LPS-stimulated alveolar macrophages; 3) exposure of alveolar macrophages, but not monocytes, to phorbol esters and LPS resulted in markedly augmented secretion of all studied metalloproteinases and TIMP; 4) monocyte-derived macrophages partially (but not completely) mimicked the metalloproteinase secretory phenotype of alveolar macrophages; and 5) the secretory phenotype of alveolar macrophages for interstitial collagenase (but not TIMP) was largely lost during in vitro culture. These results underscore the complexity of the process of differentiation in human mononuclear phagocytes, and provide insights into the variable capacity of mononuclear phagocytes to degrade extracellular matrix components. Moreover, we anticipate that human mononuclear phagocytes at various stages of differentiation will provide a useful model system for study of the variable regulation of secretion of human matrix-degrading metalloproteinases." @default.
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- W1489352253 date "1991-02-15" @default.
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- W1489352253 title "Neutral proteinases of human mononuclear phagocytes. Cellular differentiation markedly alters cell phenotype for serine proteinases, metalloproteinases, and tissue inhibitor of metalloproteinases." @default.
- W1489352253 doi "https://doi.org/10.4049/jimmunol.146.4.1286" @default.
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