Abstract
Oxidative stress and endoplasmic reticulum (ER) stress are involved in different types of stress-induced injuries. The aim of the present study was to evaluate the effect of Se deficiency on oxidative stress, ER stress and apoptosis in chicken livers. Chickens (1 day old, n = 180) were randomly divided into two groups: the L group [fed with a Se-deficient (Se 0.033 mg/kg) diet] and the control group [fed with a normal (Se 0.2 mg/kg) diet]. Factor-associated oxidative stress, catalase (CAT) activity, H2O2 production and the inhibition of hydroxyl radicals (·OH) in the chicken liver were determined on days 15, 25, 35, 45, 55 and 65, respectively. In addition, ER stress-related genes (GRP78, GRP94, ATF4, ATF6 and IRE) and apoptosis-related genes (caspase3 and Bcl-2) were examined by fluorescence quantitative PCR or western blot analysis. Apoptosis levels were also measured using ultrastructural observations and the TdT-mediated dUTP nick end labeling assay. The results showed that CAT activity and ·OH inhibition were decreased and that H2O2 production was increased in the low-Se group, which demonstrated that oxidative stress occurred in the chicken liver. The ER stress-related genes (GRP78, GRP94, ATF4, ATF6 and IRE) and the apoptosis-related gene caspase3 were increased (p < 0.05), while Bcl-2 was decreased (p < 0.05) by Se deficiency. In addition, apoptosis and ER lesions were observed by ultrastructural observations of the chicken liver in the low-Se group. The level of apoptosis and the number of apoptotic cells increased with time. These results indicated that the oxidative-ER stress pathway participates in Se deficiency-induced apoptosis in the chicken liver.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (31272626); the International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China (31320103920) and the Study Abroad Foundation of Heilongjiang Province (LC201031).
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Yao, L., Du, Q., Yao, H. et al. Roles of oxidative stress and endoplasmic reticulum stress in selenium deficiency-induced apoptosis in chicken liver. Biometals 28, 255–265 (2015). https://doi.org/10.1007/s10534-014-9819-3
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DOI: https://doi.org/10.1007/s10534-014-9819-3