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Zytner P, Kutschbach A, Gong W, Ohse VA, Taudte L, Kipp AP, Klotz LO, Priebs J, Steinbrenner H. Selenium-Enriched E. coli Bacteria Mitigate the Age-Associated Degeneration of Cholinergic Neurons in C. elegans. Antioxidants (Basel) 2024; 13:492. [PMID: 38671939 PMCID: PMC11047679 DOI: 10.3390/antiox13040492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Revised: 04/16/2024] [Accepted: 04/18/2024] [Indexed: 04/28/2024] Open
Abstract
Selenium (Se) is an essential trace element for humans and animals, but high-dose supplementation with Se compounds, most notably selenite, may exert cytotoxic and other adverse effects. On the other hand, bacteria, including Escherichia coli (E. coli), are capable of reducing selenite to red elemental Se that may serve as a safer Se source. Here, we examined how a diet of Se-enriched E. coli bacteria affected vital parameters and age-associated neurodegeneration in the model organism Caenorhabditis elegans (C. elegans). The growth of E. coli OP50 for 48 h in medium supplemented with 1 mM sodium selenite resulted in reddening of the bacterial culture, accompanied by Se accumulation in the bacteria. Compared to nematodes supplied with the standard E. coli OP50 diet, the worms fed on Se-enriched bacteria were smaller and slimmer, even though their food intake was not diminished. Nevertheless, given the choice, the nematodes preferred the standard diet. The fecundity of the worms was not affected by the Se-enriched bacteria, even though the production of progeny was somewhat delayed. The levels of the Se-binding protein SEMO-1, which serves as a Se buffer in C. elegans, were elevated in the group fed on Se-enriched bacteria. The occurrence of knots and ruptures within the axons of cholinergic neurons was lowered in aged nematodes provided with Se-enriched bacteria. In conclusion, C. elegans fed on Se-enriched E. coli showed less age-associated neurodegeneration, as compared to nematodes supplied with the standard diet.
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Affiliation(s)
- Palina Zytner
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (P.Z.); (A.K.); (W.G.); (V.A.O.); (L.-O.K.)
| | - Anne Kutschbach
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (P.Z.); (A.K.); (W.G.); (V.A.O.); (L.-O.K.)
| | - Weiye Gong
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (P.Z.); (A.K.); (W.G.); (V.A.O.); (L.-O.K.)
| | - Verena Alexia Ohse
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (P.Z.); (A.K.); (W.G.); (V.A.O.); (L.-O.K.)
| | - Laura Taudte
- Institute of Nutritional Sciences, Department of Nutritional Physiology, Friedrich Schiller University Jena, D-07743 Jena, Germany; (L.T.); (A.P.K.)
| | - Anna Patricia Kipp
- Institute of Nutritional Sciences, Department of Nutritional Physiology, Friedrich Schiller University Jena, D-07743 Jena, Germany; (L.T.); (A.P.K.)
| | - Lars-Oliver Klotz
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (P.Z.); (A.K.); (W.G.); (V.A.O.); (L.-O.K.)
| | - Josephine Priebs
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (P.Z.); (A.K.); (W.G.); (V.A.O.); (L.-O.K.)
| | - Holger Steinbrenner
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (P.Z.); (A.K.); (W.G.); (V.A.O.); (L.-O.K.)
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Lorenzo-Mora AM, López-Sobaler AM, Bermejo LM, González-Rodríguez LG, Cuadrado-Soto E, Peral-Suárez Á, Salas-González MD, Delgado-Losada ML, Rodríguez-Rojo IC, Barabash A, Maestú-Unturbe F, Aparicio A. Association between Mineral Intake and Cognition Evaluated by Montreal Cognitive Assessment (MoCA): A Cross-Sectional Study. Nutrients 2023; 15:4505. [PMID: 37960158 PMCID: PMC10648921 DOI: 10.3390/nu15214505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/27/2023] [Accepted: 10/20/2023] [Indexed: 11/15/2023] Open
Abstract
BACKGROUND Mineral intake may protect against cognitive impairment (CI) and all-cause dementia, which affects a large number of adults worldwide. The aim of this study was to investigate the association between mineral intake and Montreal Cognitive Assessment (MoCA), which is a sensitive and specific test. METHODS In total, 201 adults were included in a cross-sectional study. They completed a three-day dietary record to estimate their average daily intake of minerals. Contributions to dietary reference intakes (DRIs) were also calculated. The participants were divided into tertiles according to their mineral intake. CI classifications were determined via the MoCA (score < 26). Apolipoprotein E (APOE) genotyping was carried out, and the patients' anthropometric measurements and physical activity, health and personal data were collected. RESULTS The prevalence of CI in this selective sample was 54.2% (34.3% females and 19.9% males). In women, being in the third tertiles of iron and manganese intake was associated with lower odds of having CI (OR [95% CI]: 0.32 [0.11 ± 0.93]; 0.33 [0.12 ± 0.93], p < 0.05). No significant differences were observed for any of the nutrients studied in men. CONCLUSIONS These findings suggest that a low mineral intake, especially low iron and manganese intake in women, is associated with a worse cognition as assessed by MoCA.
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Affiliation(s)
- Ana M. Lorenzo-Mora
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
| | - Ana M. López-Sobaler
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
- VALORNUT Research Group, Complutense University of Madrid, 28040 Madrid, Spain;
- San Carlos Health Research Institute (IdISSC), 28040 Madrid, Spain;
| | - Laura M. Bermejo
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
- VALORNUT Research Group, Complutense University of Madrid, 28040 Madrid, Spain;
- San Carlos Health Research Institute (IdISSC), 28040 Madrid, Spain;
| | - Liliana G. González-Rodríguez
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
- VALORNUT Research Group, Complutense University of Madrid, 28040 Madrid, Spain;
| | - Esther Cuadrado-Soto
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
- VALORNUT Research Group, Complutense University of Madrid, 28040 Madrid, Spain;
| | - África Peral-Suárez
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
- School of Sport, Exercise and Health Sciences, Loughborough LE11 3TU, UK
| | - María Dolores Salas-González
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
- VALORNUT Research Group, Complutense University of Madrid, 28040 Madrid, Spain;
| | - María Luisa Delgado-Losada
- VALORNUT Research Group, Complutense University of Madrid, 28040 Madrid, Spain;
- San Carlos Health Research Institute (IdISSC), 28040 Madrid, Spain;
- Department of Experimental Psychology, Cognitive Processes and Speech Therapy, Faculty of Psychology, Complutense University of Madrid, 28223 Madrid, Spain
| | - Inmaculada C. Rodríguez-Rojo
- Center for Cognitive and Computational Neuroscience, Complutense University of Madrid, 28223 Madrid, Spain;
- Department of Nursing and Physiotherapy, Faculty of Medicine and Health Sciences, Universidad de Alcalá, 28871 Madrid, Spain
| | - Ana Barabash
- Faculty of Medicine, Department of Medicine, Complutense University of Madrid, 28040 Madrid, Spain;
- Endocrinology and Nutrition Department, Hospital Clínico Universitario San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), 28040 Madrid, Spain
- Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - Fernando Maestú-Unturbe
- San Carlos Health Research Institute (IdISSC), 28040 Madrid, Spain;
- Department of Experimental Psychology, Cognitive Processes and Speech Therapy, Faculty of Psychology, Complutense University of Madrid, 28223 Madrid, Spain
- Center for Cognitive and Computational Neuroscience, Complutense University of Madrid, 28223 Madrid, Spain;
| | - Aránzazu Aparicio
- Department of Nutrition and Food Science, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (A.M.L.-M.); (A.M.L.-S.); (L.M.B.); (E.C.-S.); (Á.P.-S.); (M.D.S.-G.); (A.A.)
- VALORNUT Research Group, Complutense University of Madrid, 28040 Madrid, Spain;
- San Carlos Health Research Institute (IdISSC), 28040 Madrid, Spain;
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Golin A, Tinkov AA, Aschner M, Farina M, da Rocha JBT. Relationship between selenium status, selenoproteins and COVID-19 and other inflammatory diseases: A critical review. J Trace Elem Med Biol 2023; 75:127099. [PMID: 36372013 PMCID: PMC9630303 DOI: 10.1016/j.jtemb.2022.127099] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/19/2022] [Accepted: 11/01/2022] [Indexed: 11/06/2022]
Abstract
The antioxidant effects of selenium as a component of selenoproteins has been thought to modulate host immunity and viral pathogenesis. Accordingly, the association of low dietary selenium status with inflammatory and immunodeficiency has been reported in the literature; however, the causal role of selenium deficiency in chronic inflammatory diseases and viral infection is still undefined. The COVID-19, characterized by acute respiratory syndrome and caused by the novel coronavirus 2, SARS-CoV-2, has infected millions of individuals worldwide since late 2019. The severity and mortality from COVID-19 have been associated with several factor, including age, sex and selenium deficiency. However, available data on selenium status and COVID-19 are limited, and a possible causative role for selenium deficiency in COVID-19 severity has yet to be fully addressed. In this context, we review the relationship between selenium, selenoproteins, COVID-19, immune and inflammatory responses, viral infection, and aging. Regardless of the role of selenium in immune and inflammatory responses, we emphasize that selenium supplementation should be indicated after a selenium deficiency be detected, particularly, in view of the critical role played by selenoproteins in human health. In addition, the levels of selenium should be monitored after the start of supplementation and discontinued as soon as normal levels are reached. Periodic assessment of selenium levels after supplementation is a critical issue to avoid over production of toxic metabolites of selenide because under normal conditions, selenoproteins attain saturated expression levels that limits their potential deleterious metabolic effects.
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Affiliation(s)
- Anieli Golin
- Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, RS, Brazil
| | - Alexey A Tinkov
- Yaroslavl State University, Yaroslavl, Russia; Institute of Cellular and Intracellular Symbiosis, Russian Academy of Sciences, Orenburg, Russia; Institute of Bioelementology, Orenburg, Russia
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Marcelo Farina
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - João Batista Teixeira da Rocha
- Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, RS, Brazil; Departamento de Bioquímica, Instituto Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
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Bratchikov OI, Dubonos PA, Tyuzikov IA, Zhilyaeva YA. Zinc metabolism in healthy men and in patients with chronic bacterial prostatitis. RESEARCH RESULTS IN PHARMACOLOGY 2022. [DOI: 10.3897/rrpharmacology.8.94845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Introduction: Zinc is a vital trace element, which regulates metabolism of a prostate gland. It has been established that a low plasma zinc level in men increases the risk of chronic prostatitis and vice versa, chronic prostatitis is often accompanied by zinc deficiency in the prostate gland. The purpose of this study is to research the features and possible correlations of zinc metabolism disorders at systemic (in blood) and local (in prostatic fluid) levels in healthy men and patients with chronic bacterial prostatitis (CBP).
Materials and methods: Ninety patients with CBP (main group) and thirty healthy men (control group) were randomized by age (mean age 38.5±2.9 years) and examined. In addition to standard examinations, the zinc levels in blood serum and prostatic fluid were determined, and the oxidative status of the prostate gland was assessed (the level of reactive oxygen species (ROS), conjugated dienes, malondialdehyde, superoxide dismutase (SOD) activity in the prostatic fluid) according to standard methods.
Results and discussion: In patients with CBP, the absolute deficiency of plasma and prostatic zinc was detected 2.89 and 2.5 times more often, respectively, than in healthy men (p < 0.05). At the same time, both the patients with CBP and healthy men had significant correlations between plasma zinc and zinc in prostatic fluid (r = 0.345; n = 37; p = 0.001 and r = 0.156; n = 30; p = 0.001; respectively). A significant positive correlation between the zinc level and the activity of SOD in prostatic fluid was revealed only in the patients with CBP (r = 0.389; n = 90; p = 0.001).
Conclusion: Zinc concentration in blood plasma does not objectively reflect zinc metabolism disorders in the prostate gland, and therefore the determination of zinc in prostatic fluid is the most reliable and sensitive method for assessing zink disorders in patients with CBP.
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Selenium: An Antioxidant with a Critical Role in Anti-Aging. Molecules 2022; 27:molecules27196613. [PMID: 36235150 PMCID: PMC9570904 DOI: 10.3390/molecules27196613] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 09/28/2022] [Accepted: 10/01/2022] [Indexed: 02/08/2023] Open
Abstract
Aging is characterized by an imbalance between damage inflicted by reactive oxygen species (ROS) and the antioxidative defenses of the organism. As a significant nutritional factor, the trace element selenium (Se) may remodel gradual and spontaneous physiological changes caused by oxidative stress, potentially leading to disease prevention and healthy aging. Se is involved in improving antioxidant defense, immune functions, and metabolic homeostasis. An inadequate Se status may reduce human life expectancy by accelerating the aging process or increasing vulnerability to various disorders, including immunity dysfunction, and cancer risk. This review highlights the available studies on the effective role of Se in aging mechanisms and shows the potential clinical implications related to its consumption. The main sources of organic Se and the advantages of its nanoformulations were also discussed.
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Shi Y, Han L, Zhang X, Xie L, Pan P, Chen F. Selenium Alleviates Cerebral Ischemia/Reperfusion Injury by Regulating Oxidative Stress, Mitochondrial Fusion and Ferroptosis. Neurochem Res 2022; 47:2992-3002. [PMID: 35725978 PMCID: PMC9470641 DOI: 10.1007/s11064-022-03643-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 05/18/2022] [Accepted: 05/19/2022] [Indexed: 11/29/2022]
Abstract
To clarify the potential role of selenium (Se) on cerebral ischemia/reperfusion (I/R) injury, we utilized mouse middle cerebral artery occlusion (MCAO) followed by reperfusion as an animal model and oxygen-glucose deprivation and reoxygenation (OGD/R) to treat N2a cells as a cell model, respectively. MCAO model was established in mice and then divided into different groups with or without Se treatment. TTC staining was used to observe whether the cerebral I/R modeling was successful, and the apoptosis level was determined by TUNEL staining. The expression of GPx-4 and p22phox was assessed by western blot. In vitro experiments, the OGD/R induced oxidative stress in N2a cells was assessed by levels of GSH/GSSG, malondialdehyde, superoxide dismutase and iron content, respectively. QRT-PCR was used to detect the mRNA levels of Cox-2, Fth1, Mfn1 and mtDNA in N2a cells. JC-1 staining and flow cytometry was performed to detect the mitochondrial membrane potential. Se treatment alleviated cerebral I/R injury and improved the survival rate of mice. Additionally, Se treatment apparently attenuated oxidative stress and inhibited iron accumulation in MCAO model mice and OGD/R model of N2a cells. In terms of its mechanism, Se could up-regulate Mfn1 expression to alleviate oxidative stress and ferroptosis by promoting mitochondrial fusion in vivo and vitro. These findings suggest that Se may have great potential in alleviating cerebral I/R injury.
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Affiliation(s)
- Yuanyuan Shi
- Department of Central Laboratory, The Yancheng School of Clinical Medicine of Nanjing Medical University (Yancheng Third People’s Hospital), Yancheng, 224008 Jiangsu China
| | - Lijian Han
- Department of Neurology, The Yancheng School of Clinical Medicine of Nanjing Medical University (Yancheng Third People’s Hospital), Yancheng, 224008 Jiangsu China
| | - Xianxian Zhang
- Department of Neurology, The Yancheng School of Clinical Medicine of Nanjing Medical University (Yancheng Third People’s Hospital), Yancheng, 224008 Jiangsu China
| | - Lili Xie
- Department of Neurology, The Yancheng School of Clinical Medicine of Nanjing Medical University (Yancheng Third People’s Hospital), Yancheng, 224008 Jiangsu China
| | - Pinglei Pan
- Department of Central Laboratory, The Yancheng School of Clinical Medicine of Nanjing Medical University (Yancheng Third People’s Hospital), Yancheng, 224008 Jiangsu China
| | - Fei Chen
- Department of Central Laboratory, The Yancheng School of Clinical Medicine of Nanjing Medical University (Yancheng Third People’s Hospital), Yancheng, 224008 Jiangsu China
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Xu J, Zhou H, Xiang G. Identification of Key Biomarkers and Pathways for Maintaining Cognitively Normal Brain Aging Based on Integrated Bioinformatics Analysis. Front Aging Neurosci 2022; 14:833402. [PMID: 35356296 PMCID: PMC8959911 DOI: 10.3389/fnagi.2022.833402] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 02/07/2022] [Indexed: 12/18/2022] Open
Abstract
Background Given the arrival of the aging population has caused a series of social and economic problems, we aimed to explore the key genes underlying cognitively normal brain aging and its potential molecular mechanisms. Methods GSE11882 was downloaded from Gene Expression Omnibus (GEO). The data from different brain regions were divided into aged and young groups for analysis. Co-expressed differentially expressed genes (DEGs) were screened. Functional analysis, protein–protein interaction (PPI) network, microRNA (miRNA)-gene, and transcription factor (TF)-gene networks were performed to identify hub genes and related molecular mechanisms. AlzData database was used to elucidate the expression of DEGs and hub genes in the aging brain. Animal studies were conducted to validate the hub genes. Results Co-expressed DEGs contained 7 upregulated and 87 downregulated genes. The enrichment analysis indicated DEGs were mainly involved in biological processes and pathways related to immune-inflammatory responses. From the PPI network, 10 hub genes were identified: C1QC, C1QA, C1QB, CD163, FCER1G, VSIG4, CD93, CD14, VWF, and CD44. CD44 and CD93 were the most targeted DEGs in the miRNA-gene network, and TIMP1, HLA-DRA, VWF, and FGF2 were the top four targeted DEGs in the TF-gene network. In AlzData database, the levels of CD44, CD93, and CD163 in patients with Alzheimer’s disease (AD) were significantly increased than those in normal controls. Meanwhile, in the brain tissues of cognitively normal mice, the expression of CD44, CD93, and CD163 in the aged group was significantly lower than those in the young group. Conclusion The underlying molecular mechanisms for maintaining healthy brain aging are related to the decline of immune-inflammatory responses. CD44, CD93, and CD 163 are considered as potential biomarkers. This study provides more molecular evidence for maintaining cognitively normal brain aging.
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Affiliation(s)
- Jinling Xu
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuhan, China
| | - Hui Zhou
- Department of General Surgery, The Third Xiangya Hospital, Central South University, Changsha, China
| | - Guangda Xiang
- The First School of Clinical Medicine, Southern Medical University, Guangzhou, China
- Department of Endocrinology, General Hospital of Central Theater Command, Wuhan, China
- *Correspondence: Guangda Xiang,
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Tauber S, Sieckmann MK, Erler K, Stahl W, Klotz LO, Steinbrenner H. Activation of Nrf2 by Electrophiles Is Largely Independent of the Selenium Status of HepG2 Cells. Antioxidants (Basel) 2021; 10:antiox10020167. [PMID: 33498683 PMCID: PMC7911449 DOI: 10.3390/antiox10020167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/15/2021] [Accepted: 01/21/2021] [Indexed: 12/13/2022] Open
Abstract
Selenoenzymes, whose activity depends on adequate selenium (Se) supply, and phase II enzymes, encoded by target genes of nuclear factor erythroid 2-related factor 2 (Nrf2), take part in governing cellular redox homeostasis. Their interplay is still not entirely understood. Here, we exposed HepG2 hepatoma cells cultured under Se-deficient, Se-adequate, or Se-supranutritional conditions to the Nrf2 activators sulforaphane, cardamonin, or diethyl maleate. Nrf2 protein levels and intracellular localization were determined by immunoblotting, and mRNA levels of Nrf2 target genes and selenoproteins were assessed by qRT-PCR. Exposure to electrophiles resulted in rapid induction of Nrf2 and its enrichment in the nucleus, independent of the cellular Se status. All three electrophilic compounds caused an enhanced expression of Nrf2 target genes, although with differences regarding extent and time course of their induction. Whereas Se status did not significantly affect mRNA levels of the Nrf2 target genes, gene expression of selenoproteins with a low position in the cellular "selenoprotein hierarchy", such as glutathione peroxidase 1 (GPX1) or selenoprotein W (SELENOW), was elevated under Se-supplemented conditions, as compared to cells held in Se-deficient media. In conclusion, no major effect of Se status on Nrf2 signalling was observed in HepG2 cells.
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Affiliation(s)
- Sarah Tauber
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Maria Katharina Sieckmann
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Katrin Erler
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Wilhelm Stahl
- Institute of Biochemistry and Molecular Biology I, Medical Faculty, Heinrich Heine University Düsseldorf, D-40001 Düsseldorf, Germany;
| | - Lars-Oliver Klotz
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
| | - Holger Steinbrenner
- Institute of Nutritional Sciences, Nutrigenomics Section, Friedrich Schiller University Jena, D-07743 Jena, Germany; (S.T.); (M.K.S.); (K.E.); (L.-O.K.)
- Correspondence: ; Tel.: +49-3641-949757
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Klotz LO, Simm A. Altern und Ernährung. Z Gerontol Geriatr 2020; 53:283-284. [DOI: 10.1007/s00391-020-01741-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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