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- W2810355350 abstract "The present experiment aimed at understanding the effects of cortisol levels on sheep peripheral blood mononuclear cell (PBMC) proliferation and cytokine production during hyperthermia. To mimic stress related to the exposition of high ambient temperatures, PBMC were cultured at 43°C for 12 h, and subsequently at 39°C for additional 12 h. Cells in normothermia were cultured at 39°C for 24 h. Phytohemagglutinin-stimulated PBMC were cultured with different cortisol levels: 0 ng/mL; 100 ng/mL, representing the physiological cortisol concentration simulating stress condition (Cort100); and 1,000 ng/mL, representing the hyperactivated hypothalamic-pituitary-adrenal axis (Cort1000). Phytohemagglutinin-stimulated PBMC with 0 ng/mL of cortisol concentration represented the positive control, whereas nonstimulated PBMC without cortisol represented the negative control (NC). The free cell supernatants were collected for the determination of IL-6, IL-1β, and IL-10 by ELISA. Bromodeoxyuridine assay was performed on cells to determine cell proliferation. Exposition to hyperthermia negatively affected cell proliferation, IL-6, IL-1β, and IL-10 concentrations in cell supernatants. The interaction of hyperthermia and cortisol level affected both cell proliferation and IL-10 production. Both PBMC proliferation and IL-10 production in positive control, Cort100, and Cort1000 decreased at 43°C as compared with 39°C NC. On average, the Cort100 treatment displayed higher concentrations of IL-6 than NC. The present experiment demonstrated that the action of cortisol concentration simulating stress condition on cell proliferation and cytokine production was a permissive/stimulatory action during normothermia, whereas it was a suppressive action during hyperthermia. These data confirmed that cortisol concentration simulating stress condition could have a role in the immune system of sheep via mediating cellular homeostasis in the condition of hyperthermia. The negative effects of hyperthermia on sheep immune responses were apparent when performing an immunological challenge." @default.
- W2810355350 created "2018-07-10" @default.
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- W2810355350 date "2018-09-01" @default.
- W2810355350 modified "2023-09-24" @default.
- W2810355350 title "Glucocorticoid effects on sheep peripheral blood mononuclear cell proliferation and cytokine production under in vitro hyperthermia" @default.
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- W2810355350 doi "https://doi.org/10.3168/jds.2018-14471" @default.
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