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Castel T, Léon K, Gandubert C, Gueguen B, Amérand A, Guernec A, Théron M, Pichavant-Rafini K. Comparison of Sodium Selenite and Selenium-Enriched Spirulina Supplementation Effects After Selenium Deficiency on Growth, Tissue Selenium Concentrations, Antioxidant Activities, and Selenoprotein Expression in Rats. Biol Trace Elem Res 2024; 202:685-700. [PMID: 37202582 DOI: 10.1007/s12011-023-03705-0] [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] [Accepted: 05/13/2023] [Indexed: 05/20/2023]
Abstract
Selenium contributes to physiological functions through its incorporation into selenoproteins. It is involved in oxidative stress defense. A selenium deficiency results in the onset or aggravation of pathologies. Following a deficiency, the repletion of selenium leads to a selenoprotein expression hierarchy misunderstood. Moreover, spirulina, a microalga, exhibits antioxidant properties and can be enriched in selenium.. Our objective was to determine the effects of a sodium selenite or selenium-enriched spirulina supplementation. Thirty-two female Wistar rats were fed for 12 weeks with a selenium-deficient diet. After 8 weeks, rats were divided into 4 groups and were fed with water, sodium selenite (20 μg Se/kg body weight), spirulina (3 g/kg bw), or selenium-enriched spirulina (20 μg Se/kg bw + 3 g spirulina/kg bw). Another group of 8 rats was fed with normal diet during 12 weeks. Selenium concentration and antioxidant enzyme activities were measured in plasma, urine, liver, brain, kidney, heart, and soleus. Expression of GPx (1, 3), Sel (P, S, T, W), SEPHS2, TrxR1, ApoER2, and megalin were quantified in liver, kidney, brain, and heart. We showed that a selenium deficiency leads to a growth delay, reversed by selenium supplementation despite a minor loss of weight in week 12 for SS rats. All tissues displayed a decrease in selenium concentration following deficiency. The brain seemed protected. We demonstrated a hierarchy in selenium distribution and selenoprotein expression. A supplementation of sodium selenite improved GPx activities and selenoprotein expression while a selenium-enriched spirulina was more effective to restore selenium concentration especially in the liver, kidney, and soleus.
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Affiliation(s)
- T Castel
- Université de Brest, EA 4324 ORPHY, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, F-29200, Brest, France.
| | - K Léon
- Université de Brest, EA 4324 ORPHY, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, F-29200, Brest, France
| | - C Gandubert
- Université de Brest, EA 4324 ORPHY, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, F-29200, Brest, France
| | - B Gueguen
- CNRS, Univ Brest, UMS 3113, F-29280, Plouzané, France
- CNRS, Univ Brest, UMR 6538 Laboratoire Géosciences Océan, F-29280, Plouzané, France
| | - A Amérand
- Université de Brest, EA 4324 ORPHY, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, F-29200, Brest, France
| | - A Guernec
- Université de Brest, EA 4324 ORPHY, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, F-29200, Brest, France
| | - M Théron
- Université de Brest, EA 4324 ORPHY, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, F-29200, Brest, France
| | - K Pichavant-Rafini
- Université de Brest, EA 4324 ORPHY, UFR Sciences et Techniques, 6 avenue Victor Le Gorgeu, F-29200, Brest, France
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Dávila-Vega JP, Gastelum-Hernández AC, Serrano-Sandoval SN, Serna-Saldívar SO, Guitiérrez-Uribe JA, Milán-Carrillo J, Martínez-Cuesta MC, Guardado-Félix D. Metabolism and Anticancer Mechanisms of Selocompounds: Comprehensive Review. Biol Trace Elem Res 2022:10.1007/s12011-022-03467-1. [PMID: 36342630 DOI: 10.1007/s12011-022-03467-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 10/26/2022] [Indexed: 11/09/2022]
Abstract
Selenium (Se) is an essential micronutrient with several functions in cellular and molecular anticancer processes. There is evidence that Se depending on its chemical form and the dosage use could act as a modulator in some anticancer mechanisms. However, the metabolism of organic and inorganic forms of dietary selenium converges on the main pathways. Different selenocompounds have been reported to have crucial roles as chemopreventive agents, such as antioxidant activity, activation of apoptotic pathways, selective cytotoxicity, antiangiogenic effect, and cell cycle modulation. Nowadays, great interest has arisen to find therapies that could enhance the antitumor effects of different Se sources. Herein, different studies are reported related to the effects of combinatorial therapies, where Se is used in combination with proteins, polysaccharides, chemotherapeutic agents or as nanoparticles. Another important factor is the presence of single nucleotide polymorphisms in genes related to Se metabolism or selenoprotein synthesis which could prevent cancer. These studies and mechanisms show promising results in cancer therapies. This review aims to compile studies that have demonstrated the anticancer effects of Se at molecular levels and its potential to be used as chemopreventive and in cancer treatment.
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Affiliation(s)
- Juan Pablo Dávila-Vega
- Escuela de Ingeniería Y Ciencias, Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, México
- Tecnologico de Monterrey, The Institute for Obesity Research, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
| | - Ana Carolina Gastelum-Hernández
- Facultad de Ciencias Químico Biológicas, Programa Regional de Posgrado en Biotecnología, Universidad Autónoma de Sinaloa, FCQB-UAS, AP 1354, CP 80000, Culiacán, Sinaloa, Mexico
| | - Sayra N Serrano-Sandoval
- Escuela de Ingeniería Y Ciencias, Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, México
- Tecnologico de Monterrey, The Institute for Obesity Research, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
| | - Sergio O Serna-Saldívar
- Escuela de Ingeniería Y Ciencias, Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, México
| | - Janet A Guitiérrez-Uribe
- Tecnologico de Monterrey, The Institute for Obesity Research, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
- Escuela de Ingeniería Y Ciencias, Tecnologico de Monterrey, Reserva Territorial Atlixcáyotl, Campus Puebla, Vía Atlixcáyotl 5718, C.P. 72453, Puebla, Pue, México
| | - Jorge Milán-Carrillo
- Tecnologico de Monterrey, The Institute for Obesity Research, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
| | - M Carmen Martínez-Cuesta
- Department of Food Biotechnology and Microbiology, Instituto de Investigación en Ciencias de La Alimentación, CIAL (CSIC-UAM), Nicolás Cabrera 9, 28049, Madrid, Spain
| | - Daniela Guardado-Félix
- Escuela de Ingeniería Y Ciencias, Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, México.
- Tecnologico de Monterrey, The Institute for Obesity Research, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico.
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Schomburg L. Selenoprotein P - Selenium transport protein, enzyme and biomarker of selenium status. Free Radic Biol Med 2022; 191:150-163. [PMID: 36067902 DOI: 10.1016/j.freeradbiomed.2022.08.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/02/2022] [Accepted: 08/15/2022] [Indexed: 11/26/2022]
Abstract
The habitual intake of selenium (Se) varies strongly around the world, and many people are at risk of inadequate supply and health risks from Se deficiency. Within the human organism, efficient transport mechanisms ensure that organs with a high demand and relevance for reproduction and survival are preferentially supplied. To this end, selenoprotein P (SELENOP) is synthesized in the liver and mediates Se transport to essential tissues such as the endocrine glands and the brain, where the "SELENOP cycle" maintains a privileged Se status. Mouse models indicate that SELENOP is not essential for life, as supplemental Se supply was capable of preventing the development of severe symptoms. However, knockout mice died under limiting supply, arguing for an essential role of SELENOP in Se deficiency. Many clinical studies support this notion, pointing to close links between health risks and low SELENOP levels. Accordingly, circulating SELENOP concentrations serve as a functional biomarker of Se supply, at least until a saturated status is achieved and SELENOP levels reach a plateau. Upon toxic intake, a further increase in SELENOP is observed, i.e., SELENOP provides information about possible selenosis. The SELENOP transcripts predict an insertion of ten selenocysteine residues. However, the decoding is imperfect, and not all these positions are ultimately occupied by selenocysteine. In addition to the selenocysteine residues near the C-terminus, one selenocysteine resides central within an enzyme-like environment. SELENOP proved capable of catalyzing peroxide degradation in vitro and protecting e.g. LDL particles from oxidation. An enzymatic activity in the intact organism is unclear, but an increasing number of clinical studies provides evidence for a direct involvement of SELENOP-dependent Se transport as an important and modifiable risk factor of disease. This interaction is particularly strong for cardiovascular and critical disease including COVID-19, cancer at various sites and autoimmune thyroiditis. This review briefly highlights the links between the growing knowledge of Se in health and disease over the last 50 years and the specific advances that have been made in our understanding of the physiological and clinical contribution of SELENOP to the current picture.
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Affiliation(s)
- Lutz Schomburg
- Charité-Universitätsmedizin Berlin, Institute for Experimental Endocrinology, Cardiovascular-Metabolic-Renal (CMR)-Research Center, Hessische Straße 3-4, 10115 Berlin, Germany.
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Obesity Hinders the Protective Effect of Selenite Supplementation on Insulin Signaling. Antioxidants (Basel) 2022; 11:antiox11050862. [PMID: 35624726 PMCID: PMC9138114 DOI: 10.3390/antiox11050862] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/22/2022] [Accepted: 04/26/2022] [Indexed: 12/11/2022] Open
Abstract
The intake of high-fat diets (HFDs) containing large amounts of saturated long-chain fatty acids leads to obesity, oxidative stress, inflammation, and insulin resistance. The trace element selenium, as a crucial part of antioxidative selenoproteins, can protect against the development of diet-induced insulin resistance in white adipose tissue (WAT) by increasing glutathione peroxidase 3 (GPx3) and insulin receptor (IR) expression. Whether selenite (Se) can attenuate insulin resistance in established lipotoxic and obese conditions is unclear. We confirm that GPX3 mRNA expression in adipose tissue correlates with BMI in humans. Cultivating 3T3-L1 pre-adipocytes in palmitate-containing medium followed by Se treatment attenuates insulin resistance with enhanced GPx3 and IR expression and adipocyte differentiation. However, feeding obese mice a selenium-enriched high-fat diet (SRHFD) only resulted in a modest increase in overall selenoprotein gene expression in WAT in mice with unaltered body weight development, glucose tolerance, and insulin resistance. While Se supplementation improved adipocyte morphology, it did not alter WAT insulin sensitivity. However, mice fed a SRHFD exhibited increased insulin content in the pancreas. Overall, while selenite protects against palmitate-induced insulin resistance in vitro, obesity impedes the effect of selenite on insulin action and adipose tissue metabolism in vivo.
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Zhang X, He H, Xiang J, Li B, Zhao M, Hou T. Selenium-containing soybean antioxidant peptides: Preparation and comprehensive comparison of different selenium supplements. Food Chem 2021; 358:129888. [PMID: 33933969 DOI: 10.1016/j.foodchem.2021.129888] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 12/12/2022]
Abstract
Present study aimed to prepare and identify antioxidative peptides from selenium-containing soybeans, and to investigate their bioavailability and protective effects against oxidative stress-related diseases. Selenium-containing soybean antioxidative peptides (Mw < 1 kDa, SePPs) hydrolyzed by Neutrase and Alcalase reached the highest cellular antioxidant activity (EC50 value 320.5 ± 39.71 μg/L). SePPs could be efficiently absorbed through Caco-2 monolayer, and then significantly reverse the tumor necrosis factor-α (TNF-α)-induced inflammatory cytokine, phosphorylated c-Jun N-terminal kinases (p-JNK) and nuclear factor-kappa B (NF-κB) levels in EA. hy926 cells (p < 0.05). d-galactose-induced aging mice model showed that liver superoxidase dismutase (SOD) and glutathione peroxidase-1 (GPx-1) were enhanced, while aspartate aminotransferase (AST), alanine aminotransferase (ALT) and NF-κB were decreased by SePPs significantly (p < 0.05). SePPs could inhibit brain oxidative stress via regulating MAPK/NF-κB pathway. Comparing with Na2SeO3, selenomethionine (SeMet) and selenium-free peptides, SePPs was found to present synergistic effects of selenium and peptides in antioxidant activity.
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Affiliation(s)
- Xing Zhang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Hui He
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Jiqian Xiang
- Enshi Tujia & Miao Autonomous Prefecture Academy of Agricultural Sciences, Enshi 445000, China
| | - Bin Li
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Mengge Zhao
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Tao Hou
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; Enshi Tujia & Miao Autonomous Prefecture Academy of Agricultural Sciences, Enshi 445000, China.
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Effects of diet supplementation with sodium selenite and selenium-enriched in puppies’ health performance from post-weaning to adulthood. Anim Feed Sci Technol 2021. [DOI: 10.1016/j.anifeedsci.2021.114897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Peng Y, Xi J, Sun Y, Chen G, Li D, Peng C, Wan X, Cai H. Tea components influencing bioavailability of fluoride and potential transport mechanism in the Caco‐2 cell line model. Int J Food Sci Technol 2020. [DOI: 10.1111/ijfs.14466] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yun Peng
- State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University Hefei 230036 China
| | - Junjun Xi
- State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University Hefei 230036 China
| | - Yue Sun
- State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University Hefei 230036 China
| | - Guijie Chen
- College of Food Science and Technology Nanjing Agricultural University Nanjing 210095 China
| | - Daxiang Li
- State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University Hefei 230036 China
| | - Chuanyi Peng
- State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University Hefei 230036 China
| | - Xiaochun Wan
- State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University Hefei 230036 China
| | - Huimei Cai
- State Key Laboratory of Tea Plant Biology and Utilization Anhui Agricultural University Hefei 230036 China
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8
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Rohn I, Kroepfl N, Bornhorst J, Kuehnelt D, Schwerdtle T. Side‐Directed Transfer and Presystemic Metabolism of Selenoneine in a Human Intestinal Barrier Model. Mol Nutr Food Res 2019; 63:e1900080. [DOI: 10.1002/mnfr.201900080] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 03/11/2019] [Indexed: 12/28/2022]
Affiliation(s)
- Isabelle Rohn
- Institute of Nutritional ScienceUniversity of Potsdam 14558 Nuthetal Germany
| | - Nina Kroepfl
- Institute of Chemistry, Analytical ChemistryNAWI GrazUniversity of Graz 8010 Graz Austria
| | - Julia Bornhorst
- Institute of Nutritional ScienceUniversity of Potsdam 14558 Nuthetal Germany
- TraceAge – DFG Research Unit FOR 2558Berlin‐Potsdam‐Jena Germany
- Faculty of Mathematics and Natural SciencesUniversity of Wuppertal 42119 Wuppertal Germany
| | - Doris Kuehnelt
- Institute of Chemistry, Analytical ChemistryNAWI GrazUniversity of Graz 8010 Graz Austria
| | - Tanja Schwerdtle
- Institute of Nutritional ScienceUniversity of Potsdam 14558 Nuthetal Germany
- TraceAge – DFG Research Unit FOR 2558Berlin‐Potsdam‐Jena Germany
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Hazane-Puch F, Champelovier P, Arnaud J, Trocmé C, Garrel C, Faure P, Laporte F. Six-day selenium supplementation led to either UVA-photoprotection or toxic effects in human fibroblasts depending on the chemical form and dose of Se. Metallomics 2014; 6:1683-92. [DOI: 10.1039/c4mt00040d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Abstract
SIGNIFICANCE The current literature regarding the effects of the gaseous signal molecule hydrogen sulfide (H2S) in the gastrointestinal system is reviewed. Bacterial, host and pharmaceutical-derived H2S are all considered and presented according to the physiological or pathophysiological effects of the gaseous signal molecule. These subjects include the toxicology of intestinal H2S with emphasis on bacterial-derived H2S, especially from sulfate-reducing bacteria, the role of endogenous and exogenous H2S in intestinal inflammation, and the roles of H2S in gastrointestinal motility, secretion and nociception. RECENT ADVANCES While its pro- and anti-inflammatory, smooth muscle relaxant, prosecretory, and pro- and antinociceptive actions continue to remain the major effects of H2S in this system; recent findings have expanded the potential molecular targets for H2S in the gastrointestinal tract. CRITICAL ISSUES Numerous discrepancies remain in the literature, and definitive molecular targets in this system have not been supported by the use of competitive antagonism. FUTURE DIRECTIONS Future work will hopefully resolve discrepancies in the literature and identify molecular targets and mechanisms of action for H2S. It is clear from the current literature that the long-appreciated relationship between H2S and the gastrointestinal tract continues to be strong as we endeavor to unravel its mysteries.
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Affiliation(s)
- David R Linden
- Enteric NeuroScience Program, Department of Physiology and Biomedical Engineering, Mayo Clinic College of Medicine , Rochester, Minnesota
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Pick D, Degen C, Leiterer M, Jahreis G, Einax JW. Transport of selenium species in Caco-2 cells: Analytical approach employing the Ussing chamber technique and HPLC-ICP-MS. Microchem J 2013. [DOI: 10.1016/j.microc.2013.02.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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Hazane-Puch F, Champelovier P, Arnaud J, Garrel C, Ballester B, Faure P, Laporte F. Long-term selenium supplementation in HaCaT cells: importance of chemical form for antagonist (protective versus toxic) activities. Biol Trace Elem Res 2013; 154:288-98. [PMID: 23771685 DOI: 10.1007/s12011-013-9709-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 05/15/2013] [Indexed: 01/09/2023]
Abstract
The beneficial effect of selenium (Se) on cancer is known to depend on the chemical form, the dose and the duration of the supplementation. The aim of this work was to explore long term antagonist (antioxidant versus toxic) effects of an inorganic (sodium selenite, Na2SeO3) and an organic (seleno-L-methionine, SeMet) forms in human immortalized keratinocytes HaCaT cells. HaCaT cells were supplemented with Na2SeO3 or SeMet at micromolar concentrations for 144 h, followed or not by UVA radiation. Se absorption, effects of UVA radiation, cell morphology, antioxidant profile, cell cycle processing, DNA fragmentation, cell death triggered and caspase-3 activity were determined. At non-toxic doses (10 μM SeMet and 1 μM Na2SeO3), SeMet was better absorbed than Na2SeO3. The protection of HaCaT from UVA-induced cell death was observed only with SeMet despite both forms increased glutathione peroxidase-1 (GPX1) activities and selenoprotein-1 (SEPW1) transcript expression. After UVA irradiation, malondialdehyde (MDA) and SH groups were not modulated whatever Se chemical form. At toxic doses (100 μM SeMet and 5 μM Na2SeO3), Na2SeO3 and SeMet inhibited cell proliferation associated with S-G2 blockage and DNA fragmentation leading to apoptosis caspase-3 dependant. SeMet only led to hydrogen peroxide production and to a decrease in mitochondrial transmembrane potential. Our study of the effects of selenium on HaCaT cells reaffirm the necessity to take into account the chemical form in experimental and intervention studies.
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Affiliation(s)
- Florence Hazane-Puch
- Unité de Biochimie Hormonale et Nutritionnelle, Département de Biochimie, Toxicologie et Pharmacologie, Institut de Biologie et de Pathologie, Centre Hospitalier Universitaire de Grenoble, CS10217, 38043 Grenoble, France.
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Pacitti D, Wang T, Page MM, Martin SAM, Sweetman J, Feldmann J, Secombes CJ. Characterization of cytosolic glutathione peroxidase and phospholipid-hydroperoxide glutathione peroxidase genes in rainbow trout (Oncorhynchus mykiss) and their modulation by in vitro selenium exposure. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2013; 130-131:97-111. [PMID: 23384997 DOI: 10.1016/j.aquatox.2012.12.020] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 12/19/2012] [Accepted: 12/20/2012] [Indexed: 06/01/2023]
Abstract
Selenium (Se) is an oligonutrient with both essential biological functions and recognized harmful effects. As the selenocysteine (SeCys) amino acid, selenium is integrated in several Se-containing proteins (selenoproteins), many of which are fundamental for cell homeostasis. Nevertheless, selenium may exert toxic effects at levels marginally above those required, mainly through the generation of reactive oxygen species (ROS). The selenium chemical speciation can strongly affect the bioavailability of this metal and its impact on metabolism, dictating the levels that can be beneficial or detrimental towards an organism. Glutathione peroxidase (GPxs) is the largest and the most studied selenoprotein family. Cytosolic glutathione peroxidase (cGPx, GPx1) and phospholipid hydroperoxide glutathione peroxidase (PHGPx, GPx4) are widely distributed throughout tissues, and play a pivotal role in regulating the oxidative status in the cell. In this study we have cloned GPx1 and GPx4 genes in rainbow trout (Oncorhynchus mykiss). The constitutive mRNA expression of these GPx genes was examined in 18 trout tissues and their responsiveness to Se availability was analysed using a rainbow trout liver cell line (RTL). An inorganic (sodium selenite, Na2SeO3) and organic (selenocysteine, Cys-Se-Se-Cys) selenocompound have been used as Se sources. GPx1 activity was also tested to verify the impact of transcript changes on the enzymatic function of these molecules. To understand if the results obtained from the transcript expression analysis were due to Se bioavailability or generation of ROS, the cytoxicity of the two selenocompounds was tested by measuring the impact of Se on cell membrane integrity. Lastly, Se availability was quantified by mass spectrophotometry to determine the amount of Se in the cell culture media, the Se background due to the foetal calf serum supplement and the contribution from the two selenocompounds used in the treatments. Three isoforms of genes for both GPx1 (GPx1a, 1b1 and 1b2) and GPx4 (GPx4a1, a2 and b) have been identified. The discovery of a third gene encoding for GPx1 and GPx4 hints that salmonids may have the biggest selenoproteome amongst all vertebrates. Transcripts of GPx4 genes were more highly expressed in most tissues examined in vivo (except blood, head kidney and spleen), whereas those of the GPx1 genes were more responsive to selenium exposure in vitro, especially to the organic form. Interestingly, GPx1a was the most sensitive to selenium availability in non stressful conditions, whereas GPx1b1 and GPx1b2 were highly induced by exposure to selenium levels that had some toxic effects on the cells. Although the different concentrations tested of the two selenocompounds modulate GPx1 transcript expression to various degrees, no significant change of GPx1 enzymatic activity was detectable. Our results lead us to conclude that trout GPx1 transcripts expression level may represent a sensitive biomarker for selenium intake, helping to evaluate if selenium concentration and chemical speciation impact on cell homeostasis.
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Affiliation(s)
- D Pacitti
- Scottish Fish Immunology Research Centre, Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen, United Kingdom
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An in vitro investigation of species-dependent intestinal transport of selenium and the impact of this process on selenium bioavailability. Br J Nutr 2012; 109:2126-34. [DOI: 10.1017/s0007114512004412] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A range of Se species has been shown to occur in a variety of different foodstuffs. Depending on its speciation, Se is more or less bioavailable to human subjects. In the present study, the role of speciation as a determinant of Se bioavailability was addressed with an investigation of species-specific mechanisms of transport at the intestinal level. The present work focused on four distinct Se compounds (selenate (Se(VI)), selenite (Se(IV)), selenomethionine (SeMet) and methylselenocysteine (MeSeCys)), whose intestinal transport was mimicked through an in vitro bicameral model of enterocyte-like differentiated Caco-2 cells. Efficiency of Se absorption was shown to be species dependent (SeMet>MeSeCys>Se(VI)>Se(IV)). In the case of SeMet, MeSeCys and Se(VI), the highly polarised passage from the apical to basolateral pole indicated that a substantial fraction of transport was transcellular, whilst results for Se(IV) indicated paracellular diffusion. Passage of the organic Se species (SeMet and MeSeCys) became saturated after 3 h, but no such effect was observed for the inorganic species. In addition, SeMet and MeSeCys transport was significantly inhibited by their respective S analogues methionine and methylcysteine, which suggests a common transport system for both kinds of compounds.
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Gammelgaard B, Rasmussen LH, Gabel-Jensen C, Steffansen B. Estimating intestinal absorption of inorganic and organic selenium compounds by in vitro flux and biotransformation studies in Caco-2 cells and ICP-MS detection. Biol Trace Elem Res 2012; 145:248-56. [PMID: 21863324 DOI: 10.1007/s12011-011-9174-y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 08/08/2011] [Indexed: 10/17/2022]
Abstract
The aim of the present work was to compare and estimate absorption and biotransformation of selected selenium compounds by studying their fluxes across Caco-2 cells. Five different selenium compounds, selenomethionine (SeMet), Se-methylselenocysteine (MeSeCys), selenate, selenite, and methylseleninic acid (MeSeA), were applied to Caco-2 cells in a concentration of 10 μM, and fluxes in both directions were studied for 2 h. Fluxes of selenite and MeSeA in the presence of excess reduced glutathione (selenite + GSH and MeSeA + GSH) and flux of MeSeA in the presence of excess cysteine (MeSeA + Cys) were also studied. Selenium absorptive and exsorptive fluxes and accumulation in cell cytosol were analyzed by means of flow injection inductively coupled plasma mass spectrometry (ICP-MS). Absorptive flux of SeMet, MeSeCys, and selenate showed values correlating to complete in vivo absorption, while selenite and MeSeA fluxes correlated to poor in vivo absorption. Speciation analysis of cell lysate and donor and receptor solutions by LC-ICP-MS showed limited transformation of all selenium compounds. Extensive transformation as well as significantly increased absorptive flux was observed when co-administering selenite with glutathione compared to administering selenite alone. These observations are possibly due to formation of selenodiglutathione (GS-Se-SG) which may be absorbed differently than selenite. Concomitant application of GSH or cysteine with MeSeA resulted in extensive transformation of MeSeA, including volatile species, whereas no significant increases in fluxes were observed. In summary, the absorption of selenite selenate and the selenoamino acids is considered complete under physiological conditions, but the absorption mechanisms and metabolism of the compounds are different.
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Affiliation(s)
- Bente Gammelgaard
- Department of Pharmaceutics and Analytical Chemistry, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark.
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Gammelgaard B, Stürup S, Christensen MV. Human urinary excretion and metabolism of (82)Se-enriched selenite and selenate determined by LC-ICP-MS. Metallomics 2012; 4:149-55. [PMID: 22258472 DOI: 10.1039/c2mt00163b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Urinary excretion of selenium after ingestion of isotope labeled selenite and selenate was studied in seven healthy volunteers, 4 men and 3 women (age 28-50 years). An aqueous solution containing 330 μL (82)Se-selenate (corresponding to 74.3 μg (82)Se) was given orally and urine samples were subsequently collected during the following 24 hours. The scheme was repeated four weeks later with a 280 μL (82)Se-selenite solution (corresponding to 74.4 μg (82)Se). The amount of total Se in the urine samples was determined by inductively coupled mass spectrometry. The mean total urinary excretion of (82)Se following (82)Se-selenate administration was 33.7% (range 15.6-42.5%) while the mean total excretion of (82)Se after (82)Se-selenite administration was 3.2% (range 2.8-3.9%) of the ingested amount. LC-ICPMS analysis of the urine samples showed that the majority of the selenium excreted after selenate ingestion was unchanged selenate for 6 of the individuals while one individual had metabolized a fraction (approx. 20%) of the selenate to selenosugar. Ingestion of 10 times larger doses of selenite in two individuals resulted in 13-23% excretion primarily excreted as selenosugar. These results show that the human metabolic pathways of selenite and selenate are different and indicate that not all selenate, although well absorbed, may be available for the beneficial health effects.
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Affiliation(s)
- Bente Gammelgaard
- Department of Pharmaceutics and Analytical Chemistry, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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Zeng H, Jackson MI, Cheng WH, Combs GF. Chemical form of selenium affects its uptake, transport, and glutathione peroxidase activity in the human intestinal Caco-2 cell model. Biol Trace Elem Res 2011; 143:1209-18. [PMID: 21181292 DOI: 10.1007/s12011-010-8935-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Accepted: 12/12/2010] [Indexed: 04/17/2023]
Abstract
Determining the effect of selenium (Se) chemical form on uptake, transport, and glutathione peroxidase activity in human intestinal cells is critical to assess Se bioavailability at nutritional doses. In this study, we found that two sources of L-selenomethionine (SeMet) and Se-enriched yeast each increased intracellular Se content more effectively than selenite or methylselenocysteine (SeMSC) in the human intestinal Caco-2 cell model. Interestingly, SeMSC, SeMet, and digested Se-enriched yeast were transported at comparable efficacy from the apical to basolateral sides, each being about 3-fold that of selenite. In addition, these forms of Se, whether before or after traversing from apical side to basolateral side, did not change the potential to support glutathione peroxidase (GPx) activity. Although selenoprotein P has been postulated to be a key Se transport protein, its intracellular expression did not differ when selenite, SeMSC, SeMet, or digested Se-enriched yeast was added to serum-contained media. Taken together, our data show, for the first time, that the chemical form of Se at nutritional doses can affect the absorptive (apical to basolateral side) efficacy and retention of Se by intestinal cells; but that, these effects are not directly correlated to the potential to support GPx activity.
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Affiliation(s)
- Huawei Zeng
- US Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, P.O. Box 9034, Grand Forks, ND 58203, USA.
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Giulivi C, Ross-Inta C, Omanska-Klusek A, Napoli E, Sakaguchi D, Barrientos G, Allen PD, Pessah IN. Basal bioenergetic abnormalities in skeletal muscle from ryanodine receptor malignant hyperthermia-susceptible R163C knock-in mice. J Biol Chem 2011; 286:99-113. [PMID: 20978128 PMCID: PMC3013050 DOI: 10.1074/jbc.m110.153247] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Revised: 10/13/2010] [Indexed: 12/25/2022] Open
Abstract
Malignant hyperthermia (MH) and central core disease in humans have been associated with mutations in the skeletal ryanodine receptor (RyR1). Heterozygous mice expressing the human MH/central core disease RyR1 R163C mutation exhibit MH when exposed to halothane or heat stress. Considering that many MH symptoms resemble those that could ensue from a mitochondrial dysfunction (e.g. metabolic acidosis and hyperthermia) and that MH-susceptible mice or humans have a higher than normal cytoplasmic Ca(2+) concentration at rest, we evaluated the role of mitochondria in skeletal muscle from R163C compared with wild type mice under basal (untriggered) conditions. R163C skeletal muscle exhibited a significant increase in matrix Ca(2+), increased reactive oxygen species production, lower expression of mitochondrial proteins, and higher mtDNA copy number. These changes, in conjunction with lower myoglobin and glycogen contents, Myh4 and GAPDH transcript levels, GAPDH activity, and lower glucose utilization suggested a switch to a compromised bioenergetic state characterized by both low oxidative phosphorylation and glycolysis. The shift in bioenergetic state was accompanied by a dysregulation of Ca(2+)-responsive signaling pathways regulated by calcineurin and ERK1/2. Chronically elevated resting Ca(2+) in R163C skeletal muscle elicited the maintenance of a fast-twitch fiber program and the development of insulin resistance-like phenotype as part of a metabolic adaptation to the R163C RyR1 mutation.
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Affiliation(s)
- Cecilia Giulivi
- Department of Molecular Biosciences, School of Veterinary Medicine, University of California, Davis, California 95616, USA.
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Delgado MJ, Nogales F, Ojeda ML, Murillo ML, Carreras O. Effect of dietary selenite on development and intestinal absorption in offspring rats. Life Sci 2010; 88:150-5. [PMID: 21062629 DOI: 10.1016/j.lfs.2010.11.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2010] [Revised: 10/06/2010] [Accepted: 10/30/2010] [Indexed: 11/25/2022]
Abstract
AIM The present study aims to compare selenium (Se) status in offspring rats born to selenium-deficient and selenium supplemented dams and to analyse Se's influence on intestinal parameters and the intestinal absorption of selenomethionine (Se-Met). MAIN METHODS Male and female Wistar rats (150-200 g) were randomised in: control (C) (0.1 ppm Se), Se-deficient (SD) (0.01 ppm Se) and Se-supplemented (SS) (0.5 ppm Se) groups; and were mated to obtain their offspring. Se levels in serum, urine and faeces in offspring and in mothers' milk were measured by graphite-furnace atomic absorption spectrometry. Duodenal transport studies in offspring were performed using an in vivo perfusion of different Se-Met concentrations (2, 5, 10, 25, 75 and 150 μM). KEY FINDING A Se-deficient diet provoked a decrease in the offspring's body weight and intestinal parameters, while the supplemented diet increased these values. Serum Se levels were similar between Se-deficient and control offspring because the urinary excretion of Se was smaller to compensate for Se homeostasis. Intestinal Se-Met absorption obeys the Michaelis-Menten equation with lower apparent constant (K(m)) and maximal velocity (V(max)) in the SD group. However, the C and SS groups presented similar K(m) and different V(max). The V(max) showed greater values in the following order of rank: SS>C>SD groups. SIGNIFICANCE Selenium intake deficiencies in offspring lead to the development of compensatory mechanisms in order to normalise serum selenium levels. These mechanisms, however, do not permit normal body development; nor do they regulate intestinal parameters and Se-Met transport.
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Affiliation(s)
- M J Delgado
- Department of Physiology and Zoology, Faculty of Pharmacy, Seville University, 41012 Seville, Spain
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Nickel A, Kottra G, Schmidt G, Danier J, Hofmann T, Daniel H. Characteristics of transport of selenoamino acids by epithelial amino acid transporters. Chem Biol Interact 2009; 177:234-41. [DOI: 10.1016/j.cbi.2008.09.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2008] [Revised: 09/10/2008] [Accepted: 09/11/2008] [Indexed: 11/26/2022]
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Tarze A, Dauplais M, Grigoras I, Lazard M, Ha-Duong NT, Barbier F, Blanquet S, Plateau P. Extracellular Production of Hydrogen Selenide Accounts for Thiol-assisted Toxicity of Selenite against Saccharomyces cerevisiae. J Biol Chem 2007; 282:8759-67. [PMID: 17261587 DOI: 10.1074/jbc.m610078200] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Administration of selenium in humans has anticarcinogenic effects. However, the boundary between cancer-protecting and toxic levels of selenium is extremely narrow. The mechanisms of selenium toxicity need to be fully understood. In Saccharomyces cerevisiae, selenite in the millimolar range is well tolerated by cells. Here we show that the lethal dose of selenite is reduced to the micromolar range by the presence of thiols in the growth medium. Glutathione and selenite spontaneously react to produce several selenium-containing compounds (selenodiglutathione, glutathioselenol, hydrogen selenide, and elemental selenium) as well as reactive oxygen species. We studied which compounds in the reaction pathway between glutathione and sodium selenite are responsible for this toxicity. Involvement of selenodiglutathione, elemental selenium, or reactive oxygen species could be ruled out. In contrast, extracellular formation of hydrogen selenide can fully explain the exacerbation of selenite toxicity by thiols. Indeed, direct production of hydrogen selenide with D-cysteine desulfhydrase induces high mortality. Selenium uptake by S. cerevisiae is considerably enhanced in the presence of external thiols, most likely through internalization of hydrogen selenide. Finally, we discuss the possibility that selenium exerts its toxicity through consumption of intracellular reduced glutathione, thus leading to severe oxidative stress.
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Affiliation(s)
- Agathe Tarze
- Laboratoire de Biochimie, UMR CNRS 7654, Département de Biologie, Ecole Polytechnique, 91128 Palaiseau Cedex, France
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Nan KJ, Li CL, Wei YC, Sui CG, Jing Z, Qin HX, Zhao LJ, Pan BR. Cloning of human 15ku selenoprotein gene from H9 T cells. World J Gastroenterol 2003; 9:1777-80. [PMID: 12918119 PMCID: PMC4611542 DOI: 10.3748/wjg.v9.i8.1777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To clone human 15ku selenoprotein gene.
METHODS: H9 human T cells were cultured in RPMI1640 medium supplemented with 100 mL/L fetal calf serum. mRNA was isolated from the cells. cDNA library was constructed by RT-PCR. The human 15ku selenoprotein gene was obtained by PCR and cloned into T vector and sequenced.
RESULTS: A unique cDNA fragment about 1244 bp was obtained. Sequence analysis identified an open reading frame within the cDNA. The gene had an in-frame TGA, which encoded selenocysteine (Sec), and a 3’-UTR SECIS element, which was required for synthesis of selenoprotein. The predicted protein molecular mass was about 15ku (162 residues). The result was identical with human liver 15ku selenoprotein gene published in Genbank.
CONCLUSION: Human 15ku selenoprotein gene can be successfully obtained from T cell line.
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Affiliation(s)
- Ke-Jun Nan
- Department of Medical Oncology, First Hospital of Xi'an Jiaotong University, Xi'an 710061, Shaanxi Province, China
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