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- W2074371965 abstract "The paradigm states that inflammatory cells disappear from airway tissues through apoptosis and phagocytosis. However, cells may also be cleared through primary cytolysis, necrosis secondary to apoptosis, or transepithelial migration. This study examines the occurrence of apoptosis, secondary necrosis, and cytolysis of eosinophils in human nasal polyps in vivo and blood eosinophils in vitro. Eosinophils abounded in subepithelium and in paracellular epithelial pathways. Macrophages commonly occurred but without engulfed eosinophils. Scattered cells, including epithelial cells, were stained by antibody to the caspase cleavage product of poly(ADP-ribose) polymerase. Few cells were apoptotic (stained by terminal deoxy RNase nick end labeling). Of more than 3,000 examined tissue eosinophils, 110 were caspase cleavage positive, but only one was apoptotic. Transmission electron microscopy analysis of more than 500 eosinophils revealed viable and cytolytic eosinophils but not apoptosis, secondary necrosis, or engulfment of eosinophils. Plasma cells but neither epithelial cells nor eosinophils exhibited apoptotic ultrastructural morphology. Eosinophils in vitro exhibited different stages of apoptosis, ending with secondary necrosis distinct from in vivo eosinophil cytolysis. Our results show that the clearance of eosinophils from nasal polyps largely occurs through nonapoptosis pathways, including cytolysis and paraepithelial migration, and they challenge the belief that apoptosis is important for clearance of eosinophils from respiratory tissues." @default.
- W2074371965 created "2016-06-24" @default.
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- W2074371965 date "2004-10-01" @default.
- W2074371965 modified "2023-09-24" @default.
- W2074371965 title "Occurrence of Apoptosis, Secondary Necrosis, and Cytolysis in Eosinophilic Nasal Polyps" @default.
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- W2074371965 doi "https://doi.org/10.1164/rccm.200402-240oc" @default.
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