title: Biogenic Nanoselenium Particles Effectively Attenuate Oxidative Stress-Induced Intestinal Epithelial Barrier Injury by Activating the Nrf2 Antioxidant Pathway.
abstract: In the present study, a new form of selenium nanoparticle (biogenic nanoselenium (BNS) particles) was synthesized using bacteria. The protection of BNS particles against oxidative stress-induced intestinal barrier dysfunction and the inherent mechanisms of this process were investigated, and selenomethionine (SeMet) and chemically synthesized nanoselenium (Nano-Se) particles were used for comparison. Characterization of BNS particles revealed that they were monodispersed and homogeneous spheres, with an average size of 139.43 ± 7.44 nm. In the mouse model of intestinal oxidative stress, BNS particles were found to protect the mouse intestinal barrier function and preserve intestinal redox homeostasis more efficiently than SeMet and Nano-Se. In vitro experiments with porcine jejunum epithelial (IPEC-J2) cells verified the stronger epithelial barrier-protecting effect of BNS particles against oxidative stress, with reduced cell apoptosis and an improved cell redox state. BNS activated the nuclear factor (erythroid-derived-2)-like 2 (Nrf2) and increased the expression of its downstream genes, including thioredoxin reductase (TXNRD)-1, NADPH dehydrogenase (NQO)-1, heme oxygenase (HO)-1, and thioredoxin (Trx), in dose- and time-dependent manners. In contrast, SeMet and Nano-Se merely enhanced the activity of the selenoenzymes TXNRD-1 and glutathione peroxidase (GPx)-1, indicating the role of selenium donors. Moreover, the knock down of Nrf2 significantly blocked the antioxidative effect of BNS, confirming that BNS protects the intestinal barrier from oxidative stress-induced damage by activating Nrf2 and its downstream genes. Our results suggest that BNS is a promising selenium species with potential application in treating oxidative stress-related intestinal diseases.
authors.affiliation: National Engineering Laboratory of Biological Feed Safety and Pollution Prevention and Control, Key laboratory of Molecular Animal Nutrition, Ministry of Education, Institute of Feed Science, Zhejiang University , 866 Yuhang Tang Road, Hangzhou 310058, China.
authors.forename: Deguang
authors.initials: D
authors.lastname: Song
authors.affiliation: National Engineering Laboratory of Biological Feed Safety and Pollution Prevention and Control, Key laboratory of Molecular Animal Nutrition, Ministry of Education, Institute of Feed Science, Zhejiang University , 866 Yuhang Tang Road, Hangzhou 310058, China.
authors.forename: Yuanzhi
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: National Engineering Laboratory of Biological Feed Safety and Pollution Prevention and Control, Key laboratory of Molecular Animal Nutrition, Ministry of Education, Institute of Feed Science, Zhejiang University , 866 Yuhang Tang Road, Hangzhou 310058, China.
authors.forename: Xiaoxiao
authors.initials: X
authors.lastname: Li
authors.affiliation: National Engineering Laboratory of Biological Feed Safety and Pollution Prevention and Control, Key laboratory of Molecular Animal Nutrition, Ministry of Education, Institute of Feed Science, Zhejiang University , 866 Yuhang Tang Road, Hangzhou 310058, China.
authors.forename: Fengqin
authors.initials: F
authors.lastname: Wang
authors.affiliation: National Engineering Laboratory of Biological Feed Safety and Pollution Prevention and Control, Key laboratory of Molecular Animal Nutrition, Ministry of Education, Institute of Feed Science, Zhejiang University , 866 Yuhang Tang Road, Hangzhou 310058, China.
authors.forename: Zeqing
authors.initials: Z
authors.lastname: Lu
authors.affiliation: National Engineering Laboratory of Biological Feed Safety and Pollution Prevention and Control, Key laboratory of Molecular Animal Nutrition, Ministry of Education, Institute of Feed Science, Zhejiang University , 866 Yuhang Tang Road, Hangzhou 310058, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Xiao
authors.affiliation: National Engineering Laboratory of Biological Feed Safety and Pollution Prevention and Control, Key laboratory of Molecular Animal Nutrition, Ministry of Education, Institute of Feed Science, Zhejiang University , 866 Yuhang Tang Road, Hangzhou 310058, China.
authors.forename: Yizhen
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000818:Animals; D000975:Antioxidants; D007422:Intestines; D051379:Mice; D051267:NF-E2-Related Factor 2; D018384:Oxidative Stress; D012643:Selenium; D013552:Swine
chemical_list: D000975:Antioxidants; D051267:NF-E2-Related Factor 2; D012643:Selenium
keywords: Nrf2; antioxidant; apoptosis; biogenic nanoselenium particles; intestinal barrier; oxidative stress