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- W2558730576 abstract "<b><i>Background:</i></b> Asthma severity and eosinophilia correlate with a deficiency in vitamin D and its active metabolite calcitriol. Calcitriol modulates numerous leukocyte functions, but its effect on eosinophils is not fully understood. We postulated that calcitriol exerts a direct effect on eosinophil biology by modulating cell survival. <b><i>Methods:</i></b> Purified peripheral blood eosinophils from atopic donors were incubated in the presence of calcitriol for up to 14 days with or without IL-5. The effect of calcitriol on eosinophil viability was measured using the annexin-V/propidium iodide flow cytometry assay. We also examined the release of eosinophil peroxidase (EPX) in media using a flow cytometry assay with anti-EPX antibodies, and the enzymatic activity of EPX was measured by an OPD-based colorimetric assay. <b><i>Results:</i></b> We observed that calcitriol sustained cell viability in eosinophils with a concurrent reduction of necrotic cells. This effect was amplified by the addition of IL-5. In parallel, we observed that a physiological dose of calcitriol (10 n<smlcap>M</smlcap>) significantly reduced eosinophil necrosis and cytolytic release of EPX in media when coincubated with IL-5. <b><i>Conclusion:</i></b> These results suggest that calcitriol may exert a direct effect on eosinophils by reducing necrosis and the cytolytic release of inflammatory mediators like EPX." @default.
- W2558730576 created "2016-12-08" @default.
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- W2558730576 date "2016-01-01" @default.
- W2558730576 modified "2023-10-14" @default.
- W2558730576 title "Calcitriol Reduces Eosinophil Necrosis Which Leads to the Diminished Release of Cytotoxic Granules" @default.
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- W2558730576 doi "https://doi.org/10.1159/000450951" @default.
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