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• W2076846521 abstract "The lifespan of red blood cells is terminated when macrophages remove senescent red blood cells by erythrophagocytosis. This puts macrophages at the center of systemic iron recycling in addition to their functions in tissue remodeling and innate immunity. Thus far, erythrophagocytosis has been studied by evaluating phagocytosis of erythrocytes that were damaged to mimic senescence. These studies have demonstrated that acquisition of some specific individual senescence markers can trigger erythrophagocytosis by macrophages, but we hypothesized that the mechanism of erythrophagocytosis of such damaged erythrocytes might differ from erythrophagocytosis of physiologically aged erythrocytes.To test this hypothesis we generated an erythrocyte population highly enriched in senescent erythrocytes by a hypertransfusion procedure in mice. Various erythrocyte-aging signals were analyzed and erythrophagocytosis was evaluated in vivo and in vitro.The large cohort of senescent erythrocytes from hypertransfused mice carried numerous aging signals identical to those of senescent erythrocytes from control mice. Phagocytosis of fluorescently-labeled erythrocytes from hypertransfused mice injected into untreated mice was much higher than phagocytosis of labeled erythrocytes from control mice. However, neither erythrocytes from hypertransfused mice, nor those from control mice were phagocytosed in vitro by primary macrophage cultures, even though these cultures were able to phagocytose oxidatively damaged erythrocytes.The large senescent erythrocyte population found in hypertransfused mice mimics physiologically aged erythrocytes. For effective erythrophagocytosis of these senescent erythrocytes, macrophages depend on some features of the intact phagocytosing tissue for support." @default.
• W2076846521 created "2016-06-24" @default.
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• W2076846521 date "2012-02-13" @default.
• W2076846521 modified "2023-10-18" @default.
• W2076846521 title "Physiologically aged red blood cells undergo erythrophagocytosis in vivo but not in vitro" @default.
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• W2076846521 doi "https://doi.org/10.3324/haematol.2011.057620" @default.
• W2076846521 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3396668" @default.
• W2076846521 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22331264" @default.
• W2076846521 hasPublicationYear "2012" @default.
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