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- W1879968192 abstract "The nucleosome, the basic structure of chromatin and normal product of cell apoptosis, plays a pivotal role both in the induction and the pathogenesis of systemic lupus erythematosus (SLE). Nucleosomes have been found to circulate at high levels in patients with SLE and apoptosis of lymphoid cells is increased during human and murine lupus. In this study, we examined the presence of possible defects in clearance mechanisms of apoptotic cells in murine lupus, and questioned further whether nucleosomes could compromise this phagocytic process. There did not appear to be any intrinsic functional defect of macrophages from young MRL+/+ lupus-prone mice to recognize and phagocytose apoptotic thymocytes. Nucleosomes, as a mimic of increased cell apoptotsis in vivo, induced a strong, dose-dependent, inhibition of phagocytosis of apoptotic thymocytes by young, pre-autoimmune, macrophages of MRL+/+ mice, whereas macrophages of non-autoimmune C3H mice only exhibited a trend to inhibition. The nucleosome-elicited inhibitory effect persisted during the development of the autoimmune response and appeared to be specific for the molecular mechanisms involved in macrophage phagocytosis of apoptotic cells. Our data suggest that nucleosome elicited inhibition of phagocytosis of apoptotic cells by MRL+/+ macrophages before the onset of the autoimmune response contribute, in a positive loop, to sustain and/or augment the levels of circulating (and potentially immunogenic) nucleosomes in lupus." @default.
- W1879968192 created "2016-06-24" @default.
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- W1879968192 date "1998-12-01" @default.
- W1879968192 modified "2023-10-06" @default.
- W1879968192 title "Nucleosomes inhibit phagocytosis of apoptotic thymocytes by peritoneal macrophages from MRL+/+ lupus-prone mice" @default.
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- W1879968192 doi "https://doi.org/10.1002/jlb.64.6.774" @default.
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