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Liu Y, Wang J, Chang Z, Li S, Zhang Z, Liu S, Wang S, Wei L, Lv Q, Ding K, Zhang Z. SeMet alleviates AFB 1-induced oxidative stress and apoptosis in rabbit kidney by regulating Nrf2//Keap1/NQO1 and PI3K/AKT signaling pathways. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 269:115742. [PMID: 38039849 DOI: 10.1016/j.ecoenv.2023.115742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 11/08/2023] [Accepted: 11/24/2023] [Indexed: 12/03/2023]
Abstract
The purpose of this study was to explore the protective effect of SeMet on renal injury induced by AFB1 in rabbits and its molecular mechanism. Forty rabbits of 35 days old were randomly divided into control group, AFB1 group (0.3 mg AFB1/kg b.w), 0.2 mg/kg Se + AFB1 group (0.3 mg AFB1/kg b.w + 0.2 mg SeMet/kg feed) and 0.4 mg/kg Se + AFB1 group (0.3 mg AFB1/kg b.w + 0.4 mg SeMet/kg feed). The SeMet treatment group was fed different doses of SeMet diets every day for 21 days. On the 17-21 day, the AFB1 treatment group, the 0.2 mg/kg Se + AFB1 group and the 0.4 mg/kg Se + AFB1 group were administered 0.3 mg AFB1 /kg b.w by gavage (dissolved in 0.5 ml olive oil) respectively. The results showed that AFB1 poisoning resulted in the changes of renal structure, the increase of renal coefficient and serum biochemical indexes, the ascent of ROS and MDA levels, the descent of antioxidant enzyme activity, and the significant down-regulation of Nrf2, HO-1 and NQO1. Besides, AFB1 poisoning increased the number of renal apoptotic cells, rised the levels of PTEN, Bax, Caspase-3 and Caspase-9, and decreased the levels of PI3K, AKT, p-AKT and Bcl-2. In summary, SeMet was added to alleviate the oxidative stress injury and apoptosis of kidney induced by AFB1, and the effect of 0.2 mg/kg Se + AFB1 is better than 0.4 mg/kg Se + AFB1.
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Affiliation(s)
- Yumei Liu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Jianing Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Zhaoyang Chang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | | | - Zhikai Zhang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Shiyang Liu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Shuaishuai Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Lan Wei
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Qiongxia Lv
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Ke Ding
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China
| | - Ziqiang Zhang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang 471000, Henan, China.
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Sun Z, Wu K, Feng C, Lei XG. Selenium-dependent glutathione peroxidase 1 regulates transcription of elongase 3 in murine tissues. Free Radic Biol Med 2023; 208:708-717. [PMID: 37726091 DOI: 10.1016/j.freeradbiomed.2023.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 08/26/2023] [Accepted: 09/11/2023] [Indexed: 09/21/2023]
Abstract
We have previously shown dysregulated lipid metabolism in tissues of glutathione peroxidase 1 (GPX1) overexpressing (OE) or deficient (KO) mice. This study explored underlying mechanisms of GPX1 in regulating tissue fatty acid (FA) biosynthesis. GPX1 OE, KO, and wild-type (WT) mice (n = 5, male, 3-6 months old) were fed a Se-adequate diet (0.3 mg/kg) and assayed for liver and adipose tissue FA profiles and mRNA levels of key enzymes of FA biosynthesis and redox-responsive transcriptional factors (TFs). These three genotypes of mice (n = 5) were injected intraperitoneally with diquat, ebselen, and N-acetylcysteine (NAC) at 10, 50, and 50 mg/kg of body weight, respectively, and killed at 0 and 12 h after the injections to detect mRNA levels of FA elongases and desaturases and the TFs in the liver and adipose tissue. A luciferase reporter assay with targeted deletions of mouse Elovl3 promoter was performed to determine transcriptional regulations of the gene by GPX1 mimic ebselen in HEK293T cells. Compared with WT, GPX1 OE and KO mice had 9-42% lower (p < 0.05) and 36-161% higher (p < 0.05) concentrations of C20:0, C22:0, and C24:0 in these two tissues, respectively, along with reciprocal increases and decreases (p < 0.05) of Elovl3 transcripts. Ebselen and NAC decreased (p < 0.05), whereas diquat decreased (p < 0.05), Elovl3 transcripts in the two tissues. Overexpression and knockout of GPX1 decreased (p < 0.05) and increased (p < 0.05) ELOVL3 levels in the two tissues, respectively. Three TFs (GABP, SP1, and DBP) were identified to bind the Elovl3 promoter (-1164/+33 base pairs). Deletion of DBP (-98/-86 base pairs) binding domain in the promoter attenuated (13%, p < 0.05) inhibition of ebselen on Elovl3 promoter activation. In summary, GPX1 overexpression down-regulated very long-chain FA biosynthesis via transcriptional inhibition of the Elovl3 promoter activation.
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Affiliation(s)
- Ziqiao Sun
- Department of Animal Science, Cornell University, Ithaca, NY, 14853, USA
| | - Kun Wu
- Department of Animal Science, Cornell University, Ithaca, NY, 14853, USA
| | - Chenhan Feng
- Department of Animal Science, Cornell University, Ithaca, NY, 14853, USA
| | - Xin Gen Lei
- Department of Animal Science, Cornell University, Ithaca, NY, 14853, USA.
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Silva Tesser GL, Junior NR, Campos FP, Costa APGC, Sartor H, Kaufmann C, de Vargas Junior JG, Eyng C, Nunes RV. Effects of feeding diets with zinc-l-selenomethionine on growth performance of broilers subjected to cyclic heat stress. Trop Anim Health Prod 2023; 55:384. [PMID: 37897539 DOI: 10.1007/s11250-023-03779-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 10/10/2023] [Indexed: 10/30/2023]
Abstract
Limited information exists on the use of zinc-l-selenomethionine (Zn-L-SeMet) in broiler diets and its effects on the growth performance, body temperature, mortality rates, blood profile, and gene expression, especially when animals are reared under cyclic heat stress conditions. This study aimed to investigate the impact of Zn-L-SeMet in broiler diets from 1 to 42 days of age reared under cyclic heat stress and its effects on growth performance, cloacal temperatures, mortality rate, blood parameters, and insulin-like growth factor 1 (IGF-1) and growth hormone receptor (GHR) gene expression in the breast muscle. A total of 1000 male Cobb 500® broiler chicks were randomly assigned to five treatments: 0, 0.15, 0.23, 0.47, and 1.30 mg/kg of Zn-L-SeMet. Each treatment consisted of 10 replicates with 20 birds each. No statistically significant differences in growth performance were observed from 1 to 21 days of age (P > 0.05). However, from 1 to 42 days, feed intake (FI) and feed conversion ratio (FCR) decreased linearly (P < 0.05). Cloacal temperatures showed no significant effects (P > 0.05), while overall mortality rate exhibited a quadratic response (P < 0.05), with the optimal inclusion level predicted to reduce broiler mortality at 0.71 mg/kg. Triglyceride (TRG) levels increased with 0.97 mg/kg (P < 0.05), and gama-glutamil transferase (GGT) levels decreased with the inclusion of 1.19 mg/kg (P < 0.05). No significant effects on IGF-1 and GHR gene expression were found (P > 0.05). In conclusion, the inclusion of 1.30 mg/kg of Zn-L-SeMet in diets of heat-stressed broilers improved growth performance from 1 to 42 days of age. An inclusion of 0.71 mg/kg reduced mortality rate, while 0.97 mg and 1.19 mg increased and reduced TRG and GGT levels, respectively.
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Affiliation(s)
- Guilherme Luis Silva Tesser
- Department of Animal Science, Western Paraná State University, Marechal Cândido Rondon, PR, 85960-000, Brazil.
| | - Nilton Rohloff Junior
- Department of Animal Science, Western Paraná State University, Marechal Cândido Rondon, PR, 85960-000, Brazil
| | - Felipe Potenza Campos
- Department of Animal Science, Western Paraná State University, Marechal Cândido Rondon, PR, 85960-000, Brazil
| | | | - Heloísa Sartor
- Department of Animal Science, Western Paraná State University, Marechal Cândido Rondon, PR, 85960-000, Brazil
| | - Cristine Kaufmann
- Department of Animal Science, Western Paraná State University, Marechal Cândido Rondon, PR, 85960-000, Brazil
| | | | - Cinthia Eyng
- Department of Animal Science, Western Paraná State University, Marechal Cândido Rondon, PR, 85960-000, Brazil
| | - Ricardo Vianna Nunes
- Department of Animal Science, Western Paraná State University, Marechal Cândido Rondon, PR, 85960-000, Brazil
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Effects of Dietary Selenium and Oxidized Fish Oils on Intestinal Lipid Metabolism and Antioxidant Responses of Yellow Catfish Pelteobagrus fulvidraco. Antioxidants (Basel) 2022; 11:antiox11101904. [PMID: 36290629 PMCID: PMC9598306 DOI: 10.3390/antiox11101904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/15/2022] [Accepted: 09/20/2022] [Indexed: 11/30/2022] Open
Abstract
Currently, the effect of selenium and oxidized fish oil interactions on the intestinal lipid metabolism and antioxidant responses of fish remains unknown. Herein, yellow catfish Pelteobagrus fulvidraco (weight: 3.99 ± 0.01 g) were used as experimental animals and were fed four diets: an adequate amount of selenium (0.25 mg kg−1) with fresh fish oil (A-Se+FFO), an adequate amount of selenium with oxidized fish oil (A-Se+OFO), a high amount of selenium (0.50 mg kg−1) with fresh fish oil (H-Se+FFO), and a high amount of selenium with oxidized fish oil (H-Se+OFO). The feeding experiment was conducted for 10 weeks. The results showed that selenium supplementation alleviated the intestinal tissue damage and reduced the lipid accumulation that was induced by oxidized fish oils. Meanwhile, we also found that 0.50 mg kg−1 selenium reduced the oxidative stress that is caused by oxidized fish oils through increasing the GSH and the activity and mRNA expression of antioxidant enzymes. Dietary selenium and oxidized fish oils also affected the mRNA expression of intestinal selenoproteins including selenow2a, selenop2, and selenot2. Mechanistically, Se and oxidized eicosapentaenoic acid (oxEPA) influenced the GSH content by affecting the DNA binding ability of activating transcription factor (ATF) 3 to the slc7a11 promoter. For the first time, our results suggested that selenium alleviated the oxidized fish oil-induced intestinal lipid deposition and the oxidative stress of the fish. We also elucidated the novel mechanism of selenium increasing the GSH content by affecting the interaction of ATF3 and the slc7a11 promoter.
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Zhao L, Chu XH, Liu S, Li R, Zhu YF, Li FN, Jiang J, Zhou JC, Lei XG, Sun LH. Selenium-Enriched Cardamine violifolia Increases Selenium and Decreases Cholesterol Concentrations in Liver and Pectoral Muscle of Broilers. J Nutr 2022; 152:2072-2079. [PMID: 35728044 DOI: 10.1093/jn/nxac141] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/19/2022] [Accepted: 06/14/2022] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Supernutrition of selenium (Se) in an effort to produce Se-enriched meat may inadvertently cause lipid accumulation. Se-enriched Cardamine violifolia (SeCv) contains >80% of Se in organic forms. OBJECTIVES This study was to determine whether feeding chickens a high dose of SeCv could produce Se-biofortified muscle without altering their lipid metabolism. METHODS Day-old male broilers were allocated to 4 groups (6 cages/group and 6 chicks/cage) and were fed either a corn-soy base diet (BD, 0.13-0.15 mg Se/kg), the BD plus 0.5 mg Se/kg as sodium selenite (SeNa) or as SeCv, or the BD plus a low-Se Cardamine violifolia (Cv, 0.20-0.21mg Se/kg). At week 6, concentrations of Se and lipid and expression of selenoprotein and lipid metabolism-related genes were determined in the pectoral muscle and liver. RESULTS The 4 diets showed no effects on growth performance of broilers. Compared with the other 3 diets, SeCv elevated (P < 0.05) Se concentrations in the pectoral muscle and liver by 14.4-127% and decreased (P < 0.05) total cholesterol concentrations by 12.5-46.7% and/or triglyceride concentrations by 28.8-31.1% in the pectoral muscle and/or liver, respectively. Meanwhile, SeCv enhanced (P < 0.05) muscular α-linolenic acid (80.0%) and hepatic arachidonic acid (58.3%) concentrations compared with SeNa and BD, respectively. SeCv downregulated (P < 0.05) the cholesterol and triglyceride synthesis-related proteins (sterol regulatory element binding transcription factor 2 and diacylglycerol O-acyltransferase 2) and upregulated (P < 0.05) hydrolysis and β-oxidation of fatty acid-related proteins (lipoprotein lipase, fatty acid binding protein 1, and carnitine palmitoyltransferase 1A), as well as selenoprotein P1 and thioredoxin reductase activity in the pectoral muscle and/or liver compared with SeNa. CONCLUSIONS Compared with SeNa, SeCv effectively raised Se and reduced lipids in the liver and muscle of broilers. The effect was mediated through the regulation of the cholesterol and triglyceride biosynthesis and utilization-related genes.
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Affiliation(s)
- Ling Zhao
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Xiao-Han Chu
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Shuai Liu
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Rong Li
- Enshi Autonomous Prefecture Academy of Agricultural Sciences, Enshi, Hubei, China
| | - Yun-Fen Zhu
- Enshi Autonomous Prefecture Academy of Agricultural Sciences, Enshi, Hubei, China
| | - Feng-Na Li
- School of Public Health (Shenzhen), Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Jie Jiang
- Shenzhen Center for Disease Control and Prevention, Shenzhen, Guangdong, China
| | - Ji-Chang Zhou
- School of Public Health (Shenzhen), Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Xin Gen Lei
- Department of Animal Science, Cornell University, Ithaca, NY, USA
| | - Lv-Hui Sun
- Hubei Hongshan Laboratory, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
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Lei XG, Combs GF, Sunde RA, Caton JS, Arthington JD, Vatamaniuk MZ. Dietary Selenium Across Species. Annu Rev Nutr 2022; 42:337-375. [PMID: 35679623 DOI: 10.1146/annurev-nutr-062320-121834] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This review traces the discoveries that led to the recognition of selenium (Se) as an essential nutrient and discusses Se-responsive diseases in animals and humans in the context of current understanding of the molecular mechanisms of their pathogeneses. The article includes a comprehensive analysis of dietary sources, nutritional utilization, metabolic functions, and dietary requirements of Se across various species. We also compare the function and regulation of selenogenomes and selenoproteomes among rodents, food animals, and humans. The review addresses the metabolic impacts of high dietary Se intakes in different species and recent revelations of Se-metabolites, means of increasing Se status, and the recycling of Se in food systems and ecosystems. Finally, research needs are identified for supporting basic science and practical applications of dietary Se in food, nutrition, and health across species. Expected final online publication date for the Annual Review of Nutrition, Volume 42 is August 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Xin Gen Lei
- Department of Animal Science, Cornell University, Ithaca, New York, USA;
| | - Gerald F Combs
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, Massachusetts, USA
| | - Roger A Sunde
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Joel S Caton
- Department of Animal Science, North Dakota State University, Fargo, North Dakota, USA
| | - John D Arthington
- Department of Animal Sciences, University of Florida, Gainesville, Florida, USA
| | - Marko Z Vatamaniuk
- Department of Animal Science, Cornell University, Ithaca, New York, USA;
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Vinceti M, Filippini T, Jablonska E, Saito Y, Wise LA. Safety of selenium exposure and limitations of selenoprotein maximization: Molecular and epidemiologic perspectives. ENVIRONMENTAL RESEARCH 2022; 211:113092. [PMID: 35259406 DOI: 10.1016/j.envres.2022.113092] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 03/04/2022] [Accepted: 03/04/2022] [Indexed: 02/08/2023]
Abstract
Recent evidence from laboratory and epidemiologic studies has shed a different light on selenium health effects and its recommended range of environmental exposure, compared with earlier research. Specifically, epidemiologic studies in Western populations have shown adverse effects of selenium exposure at low levels, sometimes below or slightly above selenium intakes needed to maximize selenoprotein expression and activity. In addition, three recent lines of evidence in molecular and biochemical studies suggest some potential drawbacks associated with selenoprotein maximization: 1) the possibility that selenoprotein upregulation is a compensatory response to oxidative challenge, induced by selenium itself or other oxidants; 2) the capacity of selenoproteins to trigger tumor growth in some circumstances; and 3) the deleterious metabolic effects of selenoproteins and particularly of selenoprotein P. The last observation provides a toxicological basis to explain why in humans selenium intake levels as low as 60 μg/day, still in the range of selenium exposure upregulating selenoprotein expression, might start to increase risk of type 2 diabetes. Overall, these new pieces of evidence from the literature call into question the purported benefit of selenoprotein maximization, and indicate the need to reassess selenium dietary reference values and upper intake level. This reassessment should clarify which range of selenoprotein upregulation follows restoration of adequate selenium availability and which range is driven by a compensatory response to selenium toxicity and oxidative stress.
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Affiliation(s)
- Marco Vinceti
- CREAGEN Research Center of Environmental, Genetic and Nutritional Epidemiology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy; Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA.
| | - Tommaso Filippini
- CREAGEN Research Center of Environmental, Genetic and Nutritional Epidemiology, Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Ewa Jablonska
- Department of Translational Research, Nofer Institute of Occupational Medicine, Lodz, Poland
| | - Yoshiro Saito
- Laboratory of Molecular Biology and Metabolism, Graduate School of Pharmaceutical Sciences, Tohoku University, Sendai, Japan
| | - Lauren A Wise
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, USA
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Zhao M, Luo T, Zhao Z, Rong H, Zhao G, Lei L. Food Chemistry of Selenium and Controversial Roles of Selenium in Affecting Blood Cholesterol Concentrations. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:4935-4945. [PMID: 33902277 DOI: 10.1021/acs.jafc.1c00784] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Hypercholesterolemia, one of the major risk factors of cardiovascular diseases, is a worldwide public health problem. Nutraceuticals and phytochemicals are attracting attention as a result of their cholesterol-lowering ability and minimal side effects. Among them, selenium (Se) is on the list. The amount of Se in foods varies by region. Se-enriched fertilizers and feeds can raise the Se content in plants and animals, while some processing methods decrease food Se content. This review summarizes recent studies on (1) the content distribution of Se in foods and factors influencing Se-enriched foods, (2) the bioavailability and metabolism of Se, and (3) the role of Se in affecting blood cholesterol and cholesterol metabolism. Although the hypocholesterolemic effect of Se is equivocal, its cholesterol-lowering activity may be more remarkable when the Se supplementation is 200 μg/day or the baseline blood total cholesterol is above 200 mg/dL in humans with low Se status.
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Affiliation(s)
- Meng Zhao
- College of Food Science, Southwest University, No. 2 Tiansheng Road, Chongqing 400715, People's Republic of China
| | - Ting Luo
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang, Jiangxi 330047, People's Republic of China
| | - Zixuan Zhao
- College of Food Science, Southwest University, No. 2 Tiansheng Road, Chongqing 400715, People's Republic of China
| | - Han Rong
- College of Material and Environment, Beijing Institute of Technology, Zhuhai, Guangdong 519085, People's Republic of China
| | - Guohua Zhao
- College of Food Science, Southwest University, No. 2 Tiansheng Road, Chongqing 400715, People's Republic of China
| | - Lin Lei
- College of Food Science, Southwest University, No. 2 Tiansheng Road, Chongqing 400715, People's Republic of China
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Zhang DG, Zhao T, Xu XJ, Lv WH, Luo Z. Dietary Marginal and Excess Selenium Increased Triglycerides Deposition, Induced Endoplasmic Reticulum Stress and Differentially Influenced Selenoproteins Expression in the Anterior and Middle Intestines of Yellow Catfish Pelteobagrus fulvidraco. Antioxidants (Basel) 2021; 10:antiox10040535. [PMID: 33805536 PMCID: PMC8067157 DOI: 10.3390/antiox10040535] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 03/21/2021] [Accepted: 03/25/2021] [Indexed: 11/16/2022] Open
Abstract
Selenium (Se) is an essential micro-mineral and plays important roles in antioxidant responses, and also influences lipid metabolism and selenoprotein expression in vertebrates, but the effects and mechanism remain unknown. The study was undertaken to decipher the insights into dietary Se influencing lipid metabolism and selenoprotein expression in the anterior and middle intestine (AI and MI) of yellow catfish Pelteobagrus fulvidraco. Yellow catfish (weight: 8.27 ± 0.03 g) were fed a 0.03- (M-Se), 0.25- (A-Se), or 6.39- (E-Se) mg Se/kg diet for 12 wk. AI and MI were analyzed for triglycerides (TGs) and Se concentrations, histochemistry and immunofluorescence, enzyme activities, and gene and protein levelsassociated with antioxidant responses, lipid metabolism, endoplasmic reticulum (ER) stress, and selenoproteome. Compared to the A-Se group, M-Se and E-Se diets significantly decreased weight gain (WG) and increased TGs concentration in the AI and MI. In the AI, compared with A-Se group, M-Se and E-Se diets significantly increased activities of fatty acid synthase, expression of lipogenic genes, and suppressed lipolysis. In the MI, compared to the A-Se group, M-Se and E-Se diets significantly increased activities of lipogenesis and expression of lipogenic genes. Compared with A-Se group, E-Se diet significantly increased glutathione peroxidase (GPX) activities in the AI and MI, and M-Se diet did not significantly reduce GPX activities in the AI and MI. Compared with the A- Se group, E-Se diet significantly increased glutathione peroxidase (GPX) activities in the plasma and liver, and M-Se diet significantly reduced GPX activities in the plasma and liver. Compared with the A-Se group, M-Se and E-Se groups also increased glucose-regulated protein 78 (GRP78, ER stress marker) protein expression of the intestine. Dietary Se supplementation also differentially influenced the expression of the 28 selenoproteins in the AI and MI, many of which possessed antioxidant characteristics. Compared with the A-Se group, the M-Se group significantly decreased mRNA levels of txnrd2 and txnrd3, but made no difference on mRNA levels of these seven GPX proteins in the MI. Moreover, we characterized sterol regulatory element binding protein 1c (SREBP1c) binding sites of three ER-resident proteins (selenom, selenon, and selenos) promoters, and found that Se positively controlled selenom, selenon, and selenos expression via SREBP1c binding to the selenom, selenon, and selenos promoter. Thus, dietary marginal and excess Se increased TGs deposition of yellow catfish P. fulvidraco, which might be mediated by ER-resident selenoproteins expression and ER stress.
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Affiliation(s)
- Dian-Guang Zhang
- Key Laboratory of Freshwater Animal Breeding, Fishery College, Huazhong Agricultural University, Ministry of Agriculture, Wuhan 430070, China; (D.-G.Z.); (T.Z.); (X.-J.X.); (W.-H.L.)
| | - Tao Zhao
- Key Laboratory of Freshwater Animal Breeding, Fishery College, Huazhong Agricultural University, Ministry of Agriculture, Wuhan 430070, China; (D.-G.Z.); (T.Z.); (X.-J.X.); (W.-H.L.)
| | - Xiao-Jian Xu
- Key Laboratory of Freshwater Animal Breeding, Fishery College, Huazhong Agricultural University, Ministry of Agriculture, Wuhan 430070, China; (D.-G.Z.); (T.Z.); (X.-J.X.); (W.-H.L.)
| | - Wu-Hong Lv
- Key Laboratory of Freshwater Animal Breeding, Fishery College, Huazhong Agricultural University, Ministry of Agriculture, Wuhan 430070, China; (D.-G.Z.); (T.Z.); (X.-J.X.); (W.-H.L.)
| | - Zhi Luo
- Key Laboratory of Freshwater Animal Breeding, Fishery College, Huazhong Agricultural University, Ministry of Agriculture, Wuhan 430070, China; (D.-G.Z.); (T.Z.); (X.-J.X.); (W.-H.L.)
- Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
- Correspondence: or ; Tel.: +86-27-8728-2113; Fax: +86-27-8728-2114
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