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Ge L, Zhou Y, Gu H, Wu Q, Zhou Z, Zheng S, Stanley D, Song Q. Male Selenoprotein F-Like (SPF-L) Influences Female Reproduction and Population Growth in Nilaparvata lugens (Hemiptera: Delphacidae). Front Physiol 2019; 10:1196. [PMID: 31611805 PMCID: PMC6773838 DOI: 10.3389/fphys.2019.01196] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Accepted: 09/03/2019] [Indexed: 12/16/2022] Open
Abstract
Selenoproteins serve in anti-oxidant and cellular redox functions in almost all organisms. A recent study characterized a selenoprotein F-like (SPF-L) in the brown plant hopper’s (BPH), Nilaparvata lugens, male accessory glands (MAGs), raised the question of whether the SPF-L is associated with female fecundity. In this study, SPF-L mRNA was found to be enriched in the internal reproductive organ (IRO) of virgin males, also expressed relatively stably in virgin males and females, and dietary dsSPF-L-treatments led to reduced MAG protein and Arginine content. Knockdown of NlSPF-L in unmated males did not influence juvenile hormone (JH) III and ecdysteroid titers, however, dsSPF-L-treated mated males had increased JH III titer, and reduced ecdysteroid titer compared to controls. After mating with dsSPF-L-treated males, female partners had reduced fat body and ovary soluble proteins and JH III tier and vitellogenin (Vg) mRNA levels, but no alterations in ecdysteroid titer, body weight or longevity. The experimental females had prolonged pre-oviposition periods and they laid fewer eggs, which suffered reduced hatching rates and population growth index (PGI). Such mating also led to impaired IRO development in males and females, which was confirmed by immunofluorescence staining. We infer that SPF-L affects reproductive success of males and their partners.
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Affiliation(s)
- LinQuan Ge
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
| | - YongKai Zhou
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
| | - HaoTian Gu
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
| | - Qing Wu
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
| | - Ze Zhou
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
| | - Sui Zheng
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China
| | - David Stanley
- Biological Control of Insects Research Laboratory, USDA/Agricultural Research Service, Columbia, MO, United States
| | - QiSheng Song
- Division of Plant Sciences, University of Missouri, Columbia, MO, United States
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Abstract
The site of protein folding and maturation for the majority of proteins that are secreted, localized to the plasma membrane or targeted to endomembrane compartments is the endoplasmic reticulum (ER). It is essential that proteins targeted to the ER are properly folded in order to carry out their function, as well as maintain protein homeostasis, as accumulation of misfolded proteins could lead to the formation of cytotoxic aggregates. Because protein folding is an error-prone process, the ER contains protein quality control networks that act to optimize proper folding and trafficking of client proteins. If a protein is unable to reach its native state, it is targeted for ER retention and subsequent degradation. The protein quality control networks of the ER that oversee this evaluation or interrogation process that decides the fate of maturing nascent chains is comprised of three general types of families: the classical chaperones, the carbohydrate-dependent system, and the thiol-dependent system. The cooperative action of these families promotes protein quality control and protein homeostasis in the ER. This review will describe the families of the ER protein quality control network and discuss the functions of individual members.
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Affiliation(s)
- Benjamin M Adams
- Department of Biochemistry and Molecular Biology, University of Massachusetts, 240 Thatcher Road, Amherst, MA, 01003, USA
- Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, MA, 01003, USA
| | - Michela E Oster
- Department of Biochemistry and Molecular Biology, University of Massachusetts, 240 Thatcher Road, Amherst, MA, 01003, USA
| | - Daniel N Hebert
- Department of Biochemistry and Molecular Biology, University of Massachusetts, 240 Thatcher Road, Amherst, MA, 01003, USA.
- Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, MA, 01003, USA.
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Zhao L, Feng Y, Deng J, Zhang NY, Zhang WP, Liu XL, Rajput SA, Qi DS, Sun LH. Selenium Deficiency Aggravates Aflatoxin B1-Induced Immunotoxicity in Chick Spleen by Regulating 6 Selenoprotein Genes and Redox/Inflammation/Apoptotic Signaling. J Nutr 2019; 149:894-901. [PMID: 31070734 DOI: 10.1093/jn/nxz019] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 11/06/2018] [Accepted: 01/23/2019] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Selenium (Se) plays a protective role in aflatoxin B1 (AFB1)-induced splenic immunotoxicity in chicks. OBJECTIVE This study was designed to reveal the underlying mechanism of Se-mediated protection against AFB1-induced splenic injury in broilers. METHODS Four groups of 1-d-old Cobb male broilers (n = 5 cages/diet, 6 chicks/cage) were arranged in a 3-wk 2 × 2 factorial design trial whereby they were fed an Se-deficient, corn- and soy-based diet [base diet (BD), 36 μg Se/kg], BD plus 1.0 mg AFB1/kg, BD plus 0.3 mg Se/kg, or BD plus 1.0 mg AFB1/kg and 0.3 mg Se/kg (as 2-hydroxy-4-methylselenobutanoic acid). Serum and spleen were collected at week 3 to assay for cytokines, histology, redox status, selected inflammation- and apoptosis-related genes and proteins, and the selenogenome. RESULTS Dietary AFB1 induced growth retardation and spleen injury, decreasing (P < 0.05) body weight gain, feed intake, feed conversion efficiency, and serum interleukin-1β by 17.8-98.1% and increasing (P < 0.05) the spleen index and serum interleukin-6 by 37.6-113%. It also reduced the splenic lymphocyte number, the white pulp region, and histiocyte proliferation in Se-adequate groups. However, Se deficiency aggravated (P < 0.05) these AFB1-induced alterations by 16.2-103%. Moreover, Se deficiency decreased (P < 0.05) splenic glutathione peroxidase (GPX) activity and glutathione-S transferase and glutathione concentrations by 35.6-89.4% in AFB1-exposed groups. Furthermore, Se deficiency upregulated (P < 0.05) the apoptotic (Caspase 3 and Caspase 9) and antimicrobial (β defensin 1 and 2) genes, but downregulated (P < 0.05) antiapoptotic (B-cell lymphoma 2) and inflammatory (E3 ubiquitin-protein ligase CBL-B) genes at the mRNA and/or protein level in AFB1 supplementation groups. Additionally, Se deficiency downregulated (P < 0.05) GPX3, thioredoxin reductase 1 (TXNRD 1), GPX4, and selenoprotein (SELENO) S, and upregulated (P < 0.05) SELENOT and SELENOU in spleen in AFB1 administered groups. CONCLUSIONS Dietary Se deficiency exacerbated AFB1-induced spleen injury in chicks, partially through the regulation of oxidative stress, inflammatory and apoptotic signaling, and 6 selenoproteins.
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Affiliation(s)
- Ling Zhao
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology
| | - Yue Feng
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology
| | - Jiang Deng
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology
| | - Ni-Ya Zhang
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology
| | - Wan-Po Zhang
- Department of Veterinary Pathology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Xiao-Li Liu
- Department of Veterinary Pathology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Shahid Ali Rajput
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology
| | - De-Sheng Qi
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology
| | - Lv-Hui Sun
- Department of Animal Nutrition and Feed Science, College of Animal Science and Technology
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Zhu J, Wang G, Li C, Li Q, Gao Y, Chen F, Xia G. Maize Sep15-like functions in endoplasmic reticulum and reactive oxygen species homeostasis to promote salt and osmotic stress resistance. PLANT, CELL & ENVIRONMENT 2019; 42:1486-1502. [PMID: 30577086 DOI: 10.1111/pce.13507] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 12/12/2018] [Accepted: 12/16/2018] [Indexed: 05/21/2023]
Abstract
In animals, the Sep15 protein participates in disease resistance, growth, and development, but the function of its plant homologues remains unclear. Here, the function of maize Sep15 was analysed by characterization of two independent Sep15-like loss-of-function mutants. In the absence of ZmSep15-like, seedling tolerance to both water and salinity stress was compromised. The mutants experienced a heightened level of endoplasmic reticulum stress, and over-accumulated reactive oxygen species, resulting in leaf necrosis. Characterization of Arabidopsis thaliana atsep15 mutant as well as like with ectopic expression of ZmSep15-like indicated that ZmSep15-like contributed to tolerance of both osmotic and salinity stress. ZmSep15-like interacted physically with UDP-glucose: glycoprotein glucosyltransferase1 (UGGT1). When the interaction was disrupted, the response to both osmotic and salinity stresses was impaired in maize or Arabidopsis. Co-expressing ZmUGGT1 and ZmUGGT2 enhanced the tolerance of A. thaliana to both stressors, indicating a functional interaction between them. Together, the data indicated that plants Sep15-like proteins promote osmotic and salinity stress resistance by influencing endoplasmic reticulum stress response and reactive oxygen species level.
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Affiliation(s)
- Jiantang Zhu
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, China
| | - Guangling Wang
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, China
| | - Cuiling Li
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, China
| | - Qingqing Li
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, China
| | - Yankun Gao
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, China
| | - Fanguo Chen
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, China
| | - Guangmin Xia
- The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Science, Shandong University, Jinan, China
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Bayse CA, Pollard DB. Conformation dynamics of cyclic disulfides and selenosulfides in CXXC(U) (X = Gly, Ala) tetrapeptide redox motifs. J Pept Sci 2019; 25:e3160. [PMID: 30873692 DOI: 10.1002/psc.3160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 01/26/2019] [Accepted: 02/05/2019] [Indexed: 02/01/2023]
Abstract
Thioredoxin fold proteins often contain a Cys-(Xxx)n -Cys(Sec) or CXn C(U) motif, where the active cysteine (C) or selenocysteine (U) is bridged by X residues, which vary with protein function. The effect of the X residues on the conformation space of the oxidized disulfide and selenosulfide forms of the CXXC(U) motif has been investigated using molecular dynamics (MD) and density functional theory. Multi-microsecond-length MD simulations of the CGGC, CGAC, and CAGC cyclic peptides show that CGGC rings readily exchange between several conformations over the course of the simulation, but steric interactions with the methyl group of Ala limit the conformation space available to the cyclic peptide, especially for CGAC. The potential for the motif to be reduced, as measured by the energy of the lowest unoccupied molecular orbitals, is dependent upon the ring conformation. These results suggest that control of available conformations by the bridging residues and the protein tertiary structure may be important for defining the function of the CXXC motif. Theoretical 77 Se chemical shifts of the selenosulfide moiety are dependent upon the conformation and/or intramolecular Se···O interactions with the backbone carbonyl group of the C-terminal U residue.
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Affiliation(s)
- Craig A Bayse
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA, 23529
| | - Deanna B Pollard
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA, 23529
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Zhang L, Zhu JH, Zhang X, Cheng WH. The Thioredoxin-Like Family of Selenoproteins: Implications in Aging and Age-Related Degeneration. Biol Trace Elem Res 2019; 188:189-195. [PMID: 30229511 DOI: 10.1007/s12011-018-1521-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 09/10/2018] [Indexed: 01/01/2023]
Abstract
The thioredoxin-like (Rdx) family proteins contain four selenoproteins (selenoprotein H, SELENOH; selenoprotein T, SELENOT; selenoprotein V, SELENOV; selenoprotein W, SELENOW) and a nonselenoprotein Rdx12. They share a CxxU or a CxxC (C, cysteine; x, any amino acid; U, selenocysteine) motif and a stretch of eGxFEI(V) sequence. From the evolutionary perspective, SELENOW and SELENOV are clustered together and SELENOH and SELENOT are in another branch. Selenoproteins in the Rdx family exhibit tissue- and organelle-specific distribution and are differentially influenced in response to selenium deficiency. While SELENOH is nucleus-exclusive, SELENOT resides mainly in endoplasmic reticulum and SELENOW in cytosol. SELENOV is expressed essentially only in the testes with unknown cellular localization. SELENOH and SELENOW are more sensitive than SELENOT and SELENOV to selenium deficiency. While physiological functions of the Rdx family of selenoproteins are not fully understand, results from animal models demonstrated that (1) brain-specific SELENOT knockout mice are susceptible to 1-methyl-4-phenylpyridinium-induced Parkinson's disease in association with redox imbalance and (2) adult zebrafishes with heterozygous SELENOH knockout are prone to dimethylbenzanthracene-induced tumorigenesis together with increased DNA damage and oxidative stress. Further animal and human studies are needed to fully understand physiological roles of the Rdx family of selenoproteins in redox regulation, genome maintenance, aging, and age-related degeneration.
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Affiliation(s)
- Li Zhang
- Department of Food Science, Nutrition and Health Promotion, Mississippi State University, Mississippi State, MS, 39762, USA
- Department of Poultry Science, Mississippi State University, Mississippi State, MS, 39762, USA
| | - Jian-Hong Zhu
- Department of Preventive Medicine, School of Public Health, Wenzhou Medical University, Wenzhou, Zhejiang, 325035, China
- Department of Geriatrics and Neurology, The Second Affiliated Hospital and Yuying Children's Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, 325035, China
| | - Xiong Zhang
- Department of Geriatrics and Neurology, The Second Affiliated Hospital and Yuying Children's Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, 325035, China
| | - Wen-Hsing Cheng
- Department of Food Science, Nutrition and Health Promotion, Mississippi State University, Mississippi State, MS, 39762, USA.
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Wang L, Jing J, Yan H, Tang J, Jia G, Liu G, Chen X, Tian G, Cai J, Shang H, Zhao H. Selenium Pretreatment Alleviated LPS-Induced Immunological Stress Via Upregulation of Several Selenoprotein Encoding Genes in Murine RAW264.7 Cells. Biol Trace Elem Res 2018; 186:505-513. [PMID: 29671252 DOI: 10.1007/s12011-018-1333-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 04/03/2018] [Indexed: 12/16/2022]
Abstract
This study was conducted to profile selenoprotein encoding genes in mouse RAW264.7 cells upon lipopolysaccharide (LPS) challenge and integrate their roles into immunological regulation in response to selenium (Se) pretreatment. LPS was used to develop immunological stress in macrophages. Cells were pretreated with different levels of Se (0, 0.5, 1.0, 1.5, 2.0 μmol Se/L) for 2 h, followed by LPS (100 ng/mL) stimulation for another 3 h. The mRNA expression of 24 selenoprotein encoding genes and 9 inflammation-related genes were investigated. The results showed that LPS (100 ng/mL) effectively induced immunological stress in RAW264.7 cells with induced inflammation cytokines, IL-6 and TNF-α, mRNA expression, and cellular secretion. LPS increased (P < 0.05) mRNA profiles of 9 inflammation-related genes in cells, while short-time Se pretreatment modestly reversed (P < 0.05) the LPS-induced upregulation of 7 genes (COX-2, ICAM-1, IL-1β, IL-6, IL-10, iNOS, and MCP-1) and further increased (P < 0.05) expression of IFN-β and TNF-α in stressed cells. Meanwhile, LPS decreased (P < 0.05) mRNA levels of 18 selenoprotein encoding genes and upregulated mRNA levels of TXNRD1 and TXNRD3 in cells. Se pretreatment recovered (P < 0.05) expression of 3 selenoprotein encoding genes (GPX1, SELENOH, and SELENOW) in a dose-dependent manner and increased (P < 0.05) expression of another 5 selenoprotein encoding genes (SELENOK, SELENOM, SELENOS, SELENOT, and TXNRD2) only at a high level (2.0 μmol Se/L). Taken together, LPS-induced immunological stress in RAW264.7 cells accompanied with the global downregulation of selenoprotein encoding genes and Se pretreatment alleviated immunological stress via upregulation of a subset of selenoprotein encoding genes.
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Affiliation(s)
- Longqiong Wang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Jinzhong Jing
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Hui Yan
- Department of Animal Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Jiayong Tang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
- Trace Element Research Center, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Gang Jia
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
- Trace Element Research Center, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Guangmang Liu
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Xiaoling Chen
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Gang Tian
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Jingyi Cai
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Haiying Shang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Hua Zhao
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, China.
- Trace Element Research Center, Sichuan Agricultural University, Chengdu, Sichuan, China.
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Role of Selenoprotein F in Protein Folding and Secretion: Potential Involvement in Human Disease. Nutrients 2018; 10:nu10111619. [PMID: 30400132 PMCID: PMC6266307 DOI: 10.3390/nu10111619] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 10/20/2018] [Accepted: 10/23/2018] [Indexed: 12/12/2022] Open
Abstract
Selenoproteins form a group of proteins of which its members contain at least one selenocysteine, and most of them serve oxidoreductase functions. Selenoprotein F (SELENOF), one of the 25 currently identified selenoproteins, is located in the endoplasmic reticulum (ER) organelle and is abundantly expressed in many tissues. It is regulated according to its selenium status, as well as by cell stress conditions. SELENOF may be functionally linked to protein folding and the secretion process in the ER. Several studies have reported positive associations between SELENOF genetic variations and several types of cancer. Also, altered expression levels of SELENOF have been found in cancer cases and neurodegenerative diseases. In this review, we summarize the current understanding of the structure, expression, and potential function of SELENOF and discuss its possible relation with various pathological processes.
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Anouar Y, Lihrmann I, Falluel-Morel A, Boukhzar L. Selenoprotein T is a key player in ER proteostasis, endocrine homeostasis and neuroprotection. Free Radic Biol Med 2018; 127:145-152. [PMID: 29800653 DOI: 10.1016/j.freeradbiomed.2018.05.076] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/18/2018] [Accepted: 05/20/2018] [Indexed: 12/11/2022]
Abstract
Selenoprotein T (SELENOT, SELT) is a thioredoxin-like enzyme anchored at the endoplasmic reticulum (ER) membrane, whose primary structure is highly conserved during evolution. SELENOT is abundant in embryonic tissues and its activity is essential during development since its gene knockout in mice is lethal early during embryogenesis. Although its expression is repressed in most adult tissues, SELENOT remains particularly abundant in endocrine organs such as the pituitary, pancreas, thyroid and testis, suggesting an important role of this selenoprotein in hormone production. Our recent studies showed indeed that SELENOT plays a key function in insulin and corticotropin biosynthesis and release by regulating ER proteostasis. Although SELENOT expression is low or undetectable in most cerebral structures, its gene conditional knockout in brain provokes anatomical alterations that impact mice behavior. This suggests that SELENOT also plays an important role in brain development and function. In addition, SELENOT is induced after injury in brain or liver and exerts a cytoprotective effect. Thus, the data gathered during the last ten years of intense investigation of this newly discovered thioredoxin-like enzyme point to an essential function during development and in adult endocrine organs or lesioned brain, most likely by regulating ER redox circuits that control homeostasis and survival of cells with intense metabolic activity.
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Affiliation(s)
- Youssef Anouar
- Rouen-Normandie University, UNIROUEN, INSERM, U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, 76821 Mont-Saint-Aignan, France; Institute for Research and Innovation in Biomedicine of Normandy, 76000 Rouen, France.
| | - Isabelle Lihrmann
- Rouen-Normandie University, UNIROUEN, INSERM, U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, 76821 Mont-Saint-Aignan, France; Institute for Research and Innovation in Biomedicine of Normandy, 76000 Rouen, France
| | - Anthony Falluel-Morel
- Rouen-Normandie University, UNIROUEN, INSERM, U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, 76821 Mont-Saint-Aignan, France; Institute for Research and Innovation in Biomedicine of Normandy, 76000 Rouen, France
| | - Loubna Boukhzar
- Rouen-Normandie University, UNIROUEN, INSERM, U1239, Neuronal and Neuroendocrine Differentiation and Communication Laboratory, 76821 Mont-Saint-Aignan, France; Institute for Research and Innovation in Biomedicine of Normandy, 76000 Rouen, France
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Peters KM, Carlson BA, Gladyshev VN, Tsuji PA. Selenoproteins in colon cancer. Free Radic Biol Med 2018; 127:14-25. [PMID: 29793041 PMCID: PMC6168369 DOI: 10.1016/j.freeradbiomed.2018.05.075] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 05/18/2018] [Accepted: 05/20/2018] [Indexed: 02/07/2023]
Abstract
Selenocysteine-containing proteins (selenoproteins) have been implicated in the regulation of various cell signaling pathways, many of which are linked to colorectal malignancies. In this in-depth excurse into the selenoprotein literature, we review possible roles for human selenoproteins in colorectal cancer, focusing on the typical hallmarks of cancer cells and their tumor-enabling characteristics. Human genome studies of single nucleotide polymorphisms in various genes coding for selenoproteins have revealed potential involvement of glutathione peroxidases, thioredoxin reductases, and other proteins. Cell culture studies with targeted down-regulation of selenoproteins and studies utilizing knockout/transgenic animal models have helped elucidate the potential roles of individual selenoproteins in this malignancy. Those selenoproteins, for which strong links to development or progression of colorectal cancer have been described, may be potential future targets for clinical interventions.
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Affiliation(s)
- Kristin M Peters
- Dept. of Biological Sciences, Towson University, 8000 York Rd, Towson, MD 21252, United States.
| | - Bradley A Carlson
- National Cancer Institute, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD 20892, United States.
| | - Vadim N Gladyshev
- Dept. of Medicine, Brigham & Women's Hospital, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, United States.
| | - Petra A Tsuji
- Dept. of Biological Sciences, Towson University, 8000 York Rd, Towson, MD 21252, United States.
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61
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Yang T, Liu T, Cao C, Xu S. miR‐200a‐5p augments cardiomyocyte hypertrophy induced by glucose metabolism disorder via the regulation of selenoproteins. J Cell Physiol 2018; 234:4095-4103. [DOI: 10.1002/jcp.27206] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 07/16/2018] [Indexed: 12/14/2022]
Affiliation(s)
- Tianshu Yang
- College of Veterinary Medicine Northeast Agricultural University Harbin China
| | - Tianqi Liu
- College of Veterinary Medicine Northeast Agricultural University Harbin China
| | - Changyu Cao
- Foshan University, College of Life and Science Foshan China
| | - Shiwen Xu
- College of Veterinary Medicine Northeast Agricultural University Harbin China
- Key Laboratory of Animal Cellular and Genetic Engineering of Heilongjiang Province Northeast Agricultural University Harbin China
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62
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Benham AM. Endoplasmic Reticulum redox pathways: in sickness and in health. FEBS J 2018; 286:311-321. [PMID: 30062765 DOI: 10.1111/febs.14618] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 06/25/2018] [Accepted: 07/27/2018] [Indexed: 02/06/2023]
Abstract
The Endoplasmic Reticulum (ER) is the major site for secretory protein production in eukaryotic cells and like an efficient factory, it has the capacity to expand or contract its output depending on the demand for its services. A primary function of the ER is to co-ordinate the quality control of proteins as they enter this folding factory at the base of the secretory pathway. Reduction-oxidation (redox) reactions have an important role to play in the quality control process, through the provision of disulphide bonds and by maintaining a favourable redox environment for oxidative protein folding. The ER is also a major contributor to calcium homeostasis and is a key site for lipid biosynthesis, two processes that additionally impact upon, and are influenced by, redox in the ER compartment.
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Tang J, He A, Yan H, Jia G, Liu G, Chen X, Cai J, Tian G, Shang H, Zhao H. Damage to the myogenic differentiation of C2C12 cells by heat stress is associated with up-regulation of several selenoproteins. Sci Rep 2018; 8:10601. [PMID: 30006533 PMCID: PMC6045685 DOI: 10.1038/s41598-018-29012-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 07/04/2018] [Indexed: 01/05/2023] Open
Abstract
This study was conducted to profile the selenoprotein encoding genes or proteins in mouse C2C12 cells and integrate their roles in the skeletal cell damage induced by heat stress (HS). Cells were cultured at 37.0 °C or 41.5 °C for 4, 6 or 8 days. The mRNA expression of 24 selenoprotein encoding genes and abundance of 5 selenoproteins were investigated. HS suppressed myogenic differentiation and impaired the development of muscle myotubes. HS down-regulated (P < 0.01) mRNA abundance of MYOD and MYOGENIN, and decreased (P < 0.01) MYOGENIN protein expression, HS elevated (P < 0.01) HSP70 and (P < 0.01) the ratio of BCL-2 to BAX at both mRNA and protein level. Meanwhile, HS up-regulated (P < 0.01–0.05) expressions of 18, 11 and 8 selenoprotein encoding genes after 4, 6 and 8 days of hyperthermia, and only down-regulated (P < 0.01) DIO2 after 6 and 8 days of hyperthermia, respectively. Furthermore, HS influenced expression of selenoproteins and up-regulated (P < 0.01–0.05) GPX1, GPX4 and SEPN1 after 6 days of HS. The damage to development of mouse skeletal muscle myotubes by HS accompanied with the up-regulation of both selenoprotein encoding genes and proteins, which suggested a potential protective effect of selenoprotein on hyperthermia associated damage in C2C12 cells.
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Affiliation(s)
- Jiayong Tang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China.,Trace Element Research Center, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Aihua He
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Hui Yan
- Department of Animal Sciences, Purdue University, West Lafayette, IN, 47907, USA
| | - Gang Jia
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Guangmang Liu
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Xiaoling Chen
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Jingyi Cai
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Gang Tian
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Haiying Shang
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China
| | - Hua Zhao
- Animal Nutrition Institute, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China. .,Trace Element Research Center, Sichuan Agricultural University, Chengdu, Sichuan, 611130, China.
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64
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Zoidis E, Seremelis I, Kontopoulos N, Danezis GP. Selenium-Dependent Antioxidant Enzymes: Actions and Properties of Selenoproteins. Antioxidants (Basel) 2018; 7:E66. [PMID: 29758013 PMCID: PMC5981252 DOI: 10.3390/antiox7050066] [Citation(s) in RCA: 203] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 05/07/2018] [Accepted: 05/09/2018] [Indexed: 12/23/2022] Open
Abstract
Unlike other essential trace elements that interact with proteins in the form of cofactors, selenium (Se) becomes co-translationally incorporated into the polypeptide chain as part of 21st naturally occurring amino acid, selenocysteine (Sec), encoded by the UGA codon. Any protein that includes Sec in its polypeptide chain is defined as selenoprotein. Members of the selenoproteins family exert various functions and their synthesis depends on specific cofactors and on dietary Se. The Se intake in productive animals such as chickens affect nutrient utilization, production performances, antioxidative status and responses of the immune system. Although several functions of selenoproteins are unknown, many disorders are related to alterations in selenoprotein expression or activity. Selenium insufficiency and polymorphisms or mutations in selenoproteins' genes and synthesis cofactors are involved in the pathophysiology of many diseases, including cardiovascular disorders, immune dysfunctions, cancer, muscle and bone disorders, endocrine functions and neurological disorders. Finally, heavy metal poisoning decreases mRNA levels of selenoproteins and increases mRNA levels of inflammatory factors, underlying the antagonistic effect of Se. This review is an update on Se dependent antioxidant enzymes, presenting the current state of the art and is focusing on results obtained mainly in chicken.
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Affiliation(s)
- Evangelos Zoidis
- Department of Nutritional Physiology and Feeding, Faculty of Animal Science and Aquaculture, Agricultural University of Athens, 75 Iera Odos, 11855 Athens, Greece.
| | - Isidoros Seremelis
- Chemistry Laboratory, Department of Food Science and Human Nutrition, Agricultural University of Athens, 75 Iera Odos, 11855 Athens, Greece.
| | - Nikolaos Kontopoulos
- Chemistry Laboratory, Department of Food Science and Human Nutrition, Agricultural University of Athens, 75 Iera Odos, 11855 Athens, Greece.
| | - Georgios P Danezis
- Chemistry Laboratory, Department of Food Science and Human Nutrition, Agricultural University of Athens, 75 Iera Odos, 11855 Athens, Greece.
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65
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Donadio JLS, Rogero MM, Guerra-Shinohara EM, Barbosa F, Desmarchelier C, Borel P, Sneddon AA, Hesketh JE, Cozzolino SMF. Genetic variants in selenoprotein genes modulate biomarkers of selenium status in response to Brazil nut supplementation (the SU.BRA.NUT study). Clin Nutr 2018; 38:539-548. [PMID: 29609868 DOI: 10.1016/j.clnu.2018.03.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 03/08/2018] [Accepted: 03/12/2018] [Indexed: 12/27/2022]
Abstract
BACKGROUND The beneficial effects of selenium (Se) to human health are exerted by selenoproteins, which can be quantified in blood and used as biomarkers of Se status. Different responses of Se biomarkers after supplementation with selenomethionine and sodium selenite have been observed and some of them could be due to genetic polymorphisms, mainly single nucleotide polymorphisms (SNPs). Brazil nuts are known to be the richest natural source of Se. OBJECTIVE Investigate how genetic variations in selenoprotein genes modulate biomarkers of Se status in response to Brazil nut supplementation. METHODS The SU.BRA.NUT study was a four month interventional trial which involved healthy volunteers of both genders, selected in University of Sao Paulo. The supplementation was done with one Brazil nut a day for 8 weeks, followed by 8 weeks of washout. Blood samples were collected at 5 time points: baseline, 4 and 8 weeks of supplementation and 4 and 8 weeks of washout for analysis of five biomarkers of Se status - erythrocyte GPx1 (Glutathione Peroxidase 1) activity, plasma GPx3 activity, plasma Se, erythrocyte Se, and plasma selenoprotein P. The gene expression of GPX1, SELENOP, SELENOF and SELENOS was done before and after 8 weeks of supplementation. The volunteers were genotyped for SNPs in GPX1 (rs1050450, rs3811699 and rs1800699), GPX4 (rs713041), SELENOP (rs3877899 and rs7579), SELENOF (rs5845) and SELENOS (rs34713741). RESULTS A total of 130 volunteers finished the protocol. The concentrations of four biomarkers of Se status increased significantly after 4 and 8 weeks of supplementation, being modulated by gender. In addition, erythrocyte GPx1 activity was associated with rs1050450, rs713041 and rs5845. Plasma Se was associated with rs7579 and selenoprotein P with plasma Se at baseline. Nut supplementation significantly increased GPX1 mRNA expression only in subjects with CC genotype at rs1050450. SELENOP mRNA expression was significantly lower in subjects with GG genotype at rs7579 before and after supplementation. CONCLUSION Genetic variations in GPX1 and SELENOP genes are associated with different responses of molecular and biochemical biomarkers of Se status after Brazil nut supplementation in healthy Brazilians. The SU.BRA.NUT study was registred at www.clinicaltrials.gov as NCT 03111355.
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Affiliation(s)
- Janaina L S Donadio
- Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Marcelo M Rogero
- Department of Nutrition, Faculty of Public Health, University of São Paulo, São Paulo, Brazil.
| | - Elvira M Guerra-Shinohara
- Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
| | - Fernando Barbosa
- Department of Clinical, Toxicological and Bromatological Analysis, Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil.
| | | | - Patrick Borel
- C2VN, Aix-Marseille Univ, INRA, INSERM, Marseille, France.
| | - Alan A Sneddon
- The Rowett Institute, University of Aberdeen, Aberdeen, UK.
| | - John E Hesketh
- Institute for Cell and Molecular Biosciences, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK.
| | - Silvia M F Cozzolino
- Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil.
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66
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Emerging roles of endoplasmic reticulum-resident selenoproteins in the regulation of cellular stress responses and the implications for metabolic disease. Biochem J 2018; 475:1037-1057. [PMID: 29559580 DOI: 10.1042/bcj20170920] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 02/12/2018] [Accepted: 02/13/2018] [Indexed: 12/25/2022]
Abstract
Chronic metabolic stress leads to cellular dysfunction, characterized by excessive reactive oxygen species, endoplasmic reticulum (ER) stress and inflammation, which has been implicated in the pathogenesis of obesity, type 2 diabetes and cardiovascular disease. The ER is gaining recognition as a key organelle in integrating cellular stress responses. ER homeostasis is tightly regulated by a complex antioxidant system, which includes the seven ER-resident selenoproteins - 15 kDa selenoprotein, type 2 iodothyronine deiodinase and selenoproteins S, N, K, M and T. Here, the findings from biochemical, cell-based and mouse studies investigating the function of ER-resident selenoproteins are reviewed. Human experimental and genetic studies are drawn upon to highlight the relevance of these selenoproteins to the pathogenesis of metabolic disease. ER-resident selenoproteins have discrete roles in the regulation of oxidative, ER and inflammatory stress responses, as well as intracellular calcium homeostasis. To date, only two of these ER-resident selenoproteins, selenoproteins S and N have been implicated in human disease. Nonetheless, the potential of all seven ER-resident selenoproteins to ameliorate metabolic dysfunction warrants further investigation.
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67
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Barage SH, Deobagkar DD, Baladhye VB. Characterization of structural and functional role of selenocysteine in selenoprotein H and its impact on DNA binding. Amino Acids 2018; 50:593-607. [DOI: 10.1007/s00726-018-2543-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 02/15/2018] [Indexed: 12/13/2022]
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68
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Tian J, Liu J, Li J, Zheng J, Chen L, Wang Y, Liu Q, Ni J. The interaction of selenoprotein F (SELENOF) with retinol dehydrogenase 11 (RDH11) implied a role of SELENOF in vitamin A metabolism. Nutr Metab (Lond) 2018; 15:7. [PMID: 29410696 PMCID: PMC5778809 DOI: 10.1186/s12986-017-0235-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 12/13/2017] [Indexed: 11/10/2022] Open
Abstract
Background Selenoprotein F (SELENOF, was named as 15-kDa selenoprotein) has been reported to play important roles in oxidative stress, endoplasmic reticulum (ER) stress and carcinogenesis. However, the biological function of SELENOF is still unclear. Methods A yeast two-hybrid system was used to screen the interactive protein of SELENOF in a human fetal brain cDNA library. The interaction between SELENOF and interactive protein was validated by fluorescence resonance energy transfer (FRET), co-immunoprecipitation (co-IP) and pull-down assays. The production of retinol was detected by high performance liquid chromatograph (HPLC). Results Retinol dehydrogenase 11 (RDH11) was found to interact with SELENOF. RDH11 is an enzyme for the reduction of all-trans-retinaldehyde to all-trans-retinol (vitamin A). The production of retinol was decreased by SELENOF overexpression, resulting in more retinaldehyde. Conclusions SELENOF interacts with RDH11 and blocks its enzyme activity to reduce all-trans-retinaldehyde.
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Affiliation(s)
- Jing Tian
- 1College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen University, Shenzhen, 518060 China
| | - Jiapan Liu
- 1College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen University, Shenzhen, 518060 China
| | - Jieqiong Li
- 2College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Microbial Genetic Engineering, Shenzhen University, Shenzhen, 518060 China
| | - Jingxin Zheng
- 3College of Life Sciences and Oceanography, Shenzhen Engineering Laboratory for Marine Algal Biotechnology, Shenzhen University, Shenzhen, 518060 China
| | - Lifang Chen
- 4Department of Neurology, Shenzhen University 1st Affiliated Hospital, Shenzhen Second People's Hospital, Sungang West Road, Shenzhen, China
| | - Yujuan Wang
- 1College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen University, Shenzhen, 518060 China
| | - Qiong Liu
- 1College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen University, Shenzhen, 518060 China
| | - Jiazuan Ni
- 1College of Life Sciences and Oceanography, Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science, Shenzhen University, Shenzhen, 518060 China
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70
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Abstract
A sizeable fraction of the selenoproteome encodes oxidoreductases possessing a thioredoxin fold, a structural motif that is shared among a diverse group of enzymes. In these oxidoreductases, the active site is comprised of a cysteine and a selenocysteine separated by one to two amino acids. In a subset of these selenoproteins, such as human SELENOH, SELENOM, SELENOT, SELENOV, SELENOW, and SELENOF, this redox motif is positioned immediately after the first β-sheet in a short loop, and is essential for interactions with its substrate or partners. Here, we describe the preparation of a representative member of this group, SELENOM, by selenocysteine-driven expressed protein ligation. The preparation employs a peptide bond formation between two protein fragments expressed recombinantly in E. coli. This method can be employed to prepare other selenoproteins.
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Affiliation(s)
- Jun Liu
- Department of Chemistry and Biochemistry, University of Delaware, 136 Brown Laboratory, Newark, DE, 19716, USA
| | - Qingqing Chen
- Department of Chemistry and Biochemistry, University of Delaware, 136 Brown Laboratory, Newark, DE, 19716, USA
| | - Sharon Rozovsky
- Department of Chemistry and Biochemistry, University of Delaware, 136 Brown Laboratory, Newark, DE, 19716, USA.
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71
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Liu Y, Su H, Li R, Li X, Xu Y, Dai X, Zhou Y, Wang H. Comparative transcriptome analysis of Glyphodes pyloalis Walker (Lepidoptera: Pyralidae) reveals novel insights into heat stress tolerance in insects. BMC Genomics 2017; 18:974. [PMID: 29258441 PMCID: PMC5735938 DOI: 10.1186/s12864-017-4355-5] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Accepted: 11/28/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Heat tolerance is a key parameter that affects insect distribution and abundance. Glyphodes pyloalis Walker (Lepidoptera: Pyralidae) is a devastating pest of mulberry in the main mulberry-growing regions and can cause tremendous losses to sericulture by directly feeding on mulberry leaves and transmitting viruses to Bombyx mori. Moreover, G. pyloalis shows a prominent capacity for adaptation to daily and seasonal temperature fluctuations and can survive several hours under high temperature. To date, the molecular mechanism underlying the outstanding adaptability of this pest to high temperature remains unclear. RESULTS In this study, we performed comparative transcriptome analyses on G. pyloalis exposed to 25 and 40 °C for 4 h. We obtained 34,034 unigenes and identified 1275 and 1222 genes significantly upregulated or downregulated, respectively, by heat stress. Data from the transcriptome analyses indicated that some processes involved in heat tolerance are conserved, such as high expression of heat shock protein (HSP) genes and partial repression of metabolism progress. In addition, vitamin digestion and absorption pathways and detoxification pathways identified here provided new insights for the investigation of the molecular mechanisms of heat stress tolerance. Furthermore, transcriptome analysis indicated that immune and phosphatidylinositol signaling system have a close relationship with heat tolerance. In addition, the expression patterns of ten randomly selected genes, such as HSP and cytochrome P450, were consistent with the transcriptome results obtained through quantitative real-time PCR. CONCLUSIONS Comparisons among transcriptome results revealed the upregulation of HSPs and genes involved in redox homeostasis, detoxication, and immune progress. However, many metabolism progresses, such as glycolysis/gluconeogenesis and fatty acid biosynthesis, were partially repressed. The results reflected that the heat tolerance of G. pyloalis is a fairly complicated process and related to a broad range of physiological regulations. Our study can improve understanding on the mechanisms of insect thermal tolerance.
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Affiliation(s)
- Yuncai Liu
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Hang Su
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Rongqiao Li
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiaotong Li
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yusong Xu
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China.
| | - Xiangping Dai
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yanyan Zhou
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Huabing Wang
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, China.
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72
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Calles-Garcia D, Yang M, Soya N, Melero R, Ménade M, Ito Y, Vargas J, Lukacs GL, Kollman JM, Kozlov G, Gehring K. Single-particle electron microscopy structure of UDP-glucose:glycoprotein glucosyltransferase suggests a selectivity mechanism for misfolded proteins. J Biol Chem 2017; 292:11499-11507. [PMID: 28490633 DOI: 10.1074/jbc.m117.789495] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 05/07/2017] [Indexed: 11/06/2022] Open
Abstract
The enzyme UDP-glucose:glycoprotein glucosyltransferase (UGGT) mediates quality control of glycoproteins in the endoplasmic reticulum by attaching glucose to N-linked glycan of misfolded proteins. As a sensor, UGGT ensures that misfolded proteins are recognized by the lectin chaperones and do not leave the secretory pathway. The structure of UGGT and the mechanism of its selectivity for misfolded proteins have been unknown for 25 years. Here, we used negative-stain electron microscopy and small-angle X-ray scattering to determine the structure of UGGT from Drosophila melanogaster at 18-Å resolution. Three-dimensional reconstructions revealed a cage-like structure with a large central cavity. Particle classification revealed flexibility that precluded determination of a high-resolution structure. Introduction of biotinylation sites into a fungal UGGT expressed in Escherichia coli allowed identification of the catalytic and first thioredoxin-like domains. We also used hydrogen-deuterium exchange mass spectrometry to map the binding site of an accessory protein, Sep15, to the first thioredoxin-like domain. The UGGT structural features identified suggest that the central cavity contains the catalytic site and is lined with hydrophobic surfaces. This enhances the binding of misfolded substrates with exposed hydrophobic residues and excludes folded proteins with hydrophilic surfaces. In conclusion, we have determined the UGGT structure, which enabled us to develop a plausible functional model of the mechanism for UGGT's selectivity for misfolded glycoproteins.
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Affiliation(s)
- Daniel Calles-Garcia
- From the Department of Biochemistry, McGill University, Montreal, Quebec H3G0B1, Canada
| | - Meng Yang
- From the Department of Biochemistry, McGill University, Montreal, Quebec H3G0B1, Canada
| | - Naoto Soya
- Department of Physiology, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - Roberto Melero
- Biocomputing Unit, Centro Nacional de Biotectnologíay, 28049 Madrid, Spain
| | - Marie Ménade
- From the Department of Biochemistry, McGill University, Montreal, Quebec H3G0B1, Canada
| | - Yukishige Ito
- Synthetic Cellular Chemistry Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - Javier Vargas
- Biocomputing Unit, Centro Nacional de Biotectnologíay, 28049 Madrid, Spain.,Bioengineering Lab, Escuela Politécnica Superior, Universidad San Pablo CEU, 28668 Madrid, Spain, and
| | - Gergely L Lukacs
- Department of Physiology, McGill University, Montreal, Quebec H3G1Y6, Canada
| | - Justin M Kollman
- Department of Biochemistry, University of Washington, Seattle, Washington 98195-7350
| | - Guennadi Kozlov
- From the Department of Biochemistry, McGill University, Montreal, Quebec H3G0B1, Canada
| | - Kalle Gehring
- From the Department of Biochemistry, McGill University, Montreal, Quebec H3G0B1, Canada,
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Endoplasmic reticulum-resident selenoproteins as regulators of calcium signaling and homeostasis. Cell Calcium 2017; 70:76-86. [PMID: 28506443 DOI: 10.1016/j.ceca.2017.05.001] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 04/30/2017] [Indexed: 01/07/2023]
Abstract
The human selenoprotein family contains 25 members that share the common feature of containing the amino acid, selenocysteine (Sec). Seven selenoproteins are localized to the endoplasmic reticulum (ER) and exhibit different structural features contributing to a range of cellular functions. Some of these functions are either directly or indirectly related to calcium (Ca2+) flux or homeostasis. The presence of the unique Sec residue within these proteins allows some to exert oxidoreductase activity, while the function of the Sec in other ER selenoproteins remains unclear. Some functional insight has been achieved by identifying domains within the ER selenoproteins or through the identification of binding partners. For example, selenoproteins K and N (SELENOK AND SELENON) have been characterized through interactions detected with the inositol 1,4,5-triphosphate receptors (IP3Rs) and the SERCA2b pump, respectively. Others have been linked to chaperone functions related to ER stress or Ca2+ homeostasis. This review summarizes the details gathered to date regarding the ER-resident selenoproteins and their effect on Ca2+ regulated pathways and outcomes in cells.
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74
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Liu J, Chen Q, Rozovsky S. Utilizing Selenocysteine for Expressed Protein Ligation and Bioconjugations. J Am Chem Soc 2017; 139:3430-3437. [PMID: 28186733 PMCID: PMC5824972 DOI: 10.1021/jacs.6b10991] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Employing selenocysteine-containing protein fragments to form the amide bond between respective protein fragments significantly extends the current capabilities of the widely used protein engineering method, expressed protein ligation. Selenocysteine-mediated ligation is noteworthy for its high yield and efficiency. However, it has so far been restricted to solid-phase synthesized seleno-peptides and thus constrained by where the selenocysteine can be positioned. Here we employ heterologously expressed seleno-fragments to overcome the placement and size restrictions in selenocysteine-mediated chemical ligation. Following ligation, the selenocysteine can be deselenized into an alanine or serine, resulting in nonselenoproteins. This greatly extends the flexibility in selecting the conjugation site in expressed protein ligations with no influence on native cysteines. Furthermore, the selenocysteine can be used to selectively introduce site-specific protein modifications. Therefore, selenocysteine-mediated expressed protein ligation simplifies incorporation of post-translational modifications into the protein scaffold.
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Affiliation(s)
| | | | - Sharon Rozovsky
- Department of Chemistry & Biochemistry, University of Delaware, Newark, DE, 19716
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75
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Dery L, Reddy PS, Dery S, Mousa R, Ktorza O, Talhami A, Metanis N. Accessing human selenoproteins through chemical protein synthesis. Chem Sci 2017; 8:1922-1926. [PMID: 28451306 PMCID: PMC5364654 DOI: 10.1039/c6sc04123j] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 10/29/2016] [Indexed: 12/28/2022] Open
Abstract
The human body contains 25 selenoproteins, which contain in their sequence the twenty-first encoded amino acid, selenocysteine. About a dozen of these proteins remain functionally uncharacterized or poorly studied. Challenges in accessing these selenoproteins using traditional recombinant expressions have prevented biological characterization thus far. Chemical protein synthesis has the potential to overcome these hurdles. Here we report the first total chemical syntheses of two human selenoproteins, selenoprotein M (SELM) and selenoprotein W (SELW). The synthesis of the more challenging protein SELM was enabled using recent advances in the field of selenocysteine chemistry. This approach allows the preparation of selenoproteins in milligram quantities and in homogenous form, which should open new horizons for future studies to pursue a fuller biological understanding of their role in health and disease.
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Affiliation(s)
- L Dery
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra, Givat Ram , Jerusalem 91904 , Israel .
| | - P Sai Reddy
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra, Givat Ram , Jerusalem 91904 , Israel .
| | - S Dery
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra, Givat Ram , Jerusalem 91904 , Israel .
| | - R Mousa
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra, Givat Ram , Jerusalem 91904 , Israel .
| | - O Ktorza
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra, Givat Ram , Jerusalem 91904 , Israel .
| | - A Talhami
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra, Givat Ram , Jerusalem 91904 , Israel .
| | - N Metanis
- Institute of Chemistry , The Hebrew University of Jerusalem , Edmond J. Safra, Givat Ram , Jerusalem 91904 , Israel .
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76
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Shi X, Kong J, Meng X, Luan S, Luo K, Cao B, Liu N, Lu X, Deng K, Cao J, Zhang Y, Zhang H, Li X. Comparative microarray profile of the hepatopancreas in the response of "Huanghai No. 2" Fenneropenaeus chinensis to white spot syndrome virus. FISH & SHELLFISH IMMUNOLOGY 2016; 58:210-219. [PMID: 27591045 DOI: 10.1016/j.fsi.2016.07.031] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 06/30/2016] [Accepted: 07/25/2016] [Indexed: 06/06/2023]
Abstract
White spot syndrome virus (WSSV) infects all shrimp species and is the greatest detriment to shrimp culture. To better understand the mechanism of molecular responses to WSSV infection in "Huanghai No. 2" Fenneropenaeus chinensis, a microarray technique was used. Microarray gene expression profiling of 59,137 unigenes identified Differentially Expressed Genes (DEGs) both in live and moribund shrimp at early, peak and late phases. In live shrimp, 1307, 1479 and 1539 DEGs were obtained in the early, peak and late phase, respectively. Meanwhile, 1536, 2181 and 1591 DEGs were obtained in moribund shrimp. Twenty known annotation genes are uniquely expressed in the late phase of live shrimp, including adhesion regulating molecule 1, arginine kinase, BUD31 homolog, and QM. Compared to WSSV-susceptible shrimp, 75 known annotation genes are uniquely expressed in WSSV-resistant shrimp, including arginine kinase, BUD31 homolog, clottable protein 2, caspase 2, cathepsin C, calnexin, HMGBb, Histone 3, and selenoprotein M. The gene expression patterns of the infected shrimp were altered by WSSV infection. To further confirm the expression of differentially expressed genes, real-time RT-PCR was performed to test six randomly selected genes. The data will provide valuable information to understand the immune mechanism of shrimp's response to WSSV.
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Affiliation(s)
- Xiaoli Shi
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Jie Kong
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China.
| | - Xianhong Meng
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Sheng Luan
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Kun Luo
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Baoxiang Cao
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Ning Liu
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Xia Lu
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Kangyu Deng
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Jiawang Cao
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Yingxue Zhang
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Hengheng Zhang
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
| | - Xupeng Li
- Key Laboratory for Sustainable Utilization of Marine Fisheries Resources, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, PR China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao 266071, PR China
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Dai J, Zhou J, Liu H, Huang K. Selenite and ebselen supplementation attenuates D-galactose-induced oxidative stress and increases expression of SELR and SEP15 in rat lens. J Biol Inorg Chem 2016; 21:1037-1046. [PMID: 27752786 DOI: 10.1007/s00775-016-1400-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 10/08/2016] [Indexed: 12/16/2022]
Abstract
Selenite and ebselen supplementation has been shown to possess anti-cataract potential in some experimental animal models of cataract, however, the underlying mechanisms remain unclear. The present study was designed to evaluate the anti-cataract effects and the underlying mechanisms of selenite and ebselen supplementation on galactose induced cataract in rats, a common animal model of sugar cataract. Transmission electron microscopy images of lens fiber cells (LFC) and lens epithelial cells (LEC) were observed in D-galactose-induced experimental cataractous rats treated with or without selenite and ebselen, also redox homeostasis and expression of proteins such as selenoprotein R (SELR), 15kD selenoprotein (SEP15), superoxide dismutase 1 (SOD1), catalase (CAT), β-crystallin protein, aldose reductase (AR) and glucose-regulated protein 78 (GRP78) were estimated in the lenses. The results showed that D-galactose injection injured rat lens and resulted in cataract formation; however, selenite and ebselen supplementation markedly alleviated ultrastructural injury of LFC and LEC. Moreover, selenite and ebselen supplementation could mitigate the oxidative damage in rat lens and increase the protein expressions of SELR, SEP15, SOD1, CAT and β-crystallin, as well as decrease the protein expressions of AR and GRP78. Taken together, these findings for the first time reveal the anti-cataract potential of selenite and ebselen in galactosemic cataract, and provide important new insights into the anti-cataract mechanisms of selenite and ebselen in sugar cataract.
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Affiliation(s)
- Jie Dai
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan, Wuhan, Hubei, 430074, People's Republic of China
| | - Jun Zhou
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan, Wuhan, Hubei, 430074, People's Republic of China.
| | - Hongmei Liu
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan, Wuhan, Hubei, 430074, People's Republic of China
| | - Kaixun Huang
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Hongshan, Wuhan, Hubei, 430074, People's Republic of China.
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78
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García-Triana A, Peregrino-Uriarte AB, Yepiz-Plascencia G. Selenoprotein M gene expression, peroxidases activity and hydrogen peroxide concentration are differentially regulated in gill and hepatopancreas of the white shrimp Litopenaeus vannamei during hypoxia and reoxygenation. Comp Biochem Physiol A Mol Integr Physiol 2016; 199:14-20. [DOI: 10.1016/j.cbpa.2016.04.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/10/2016] [Accepted: 04/18/2016] [Indexed: 10/21/2022]
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Brigelius-Flohé R, Flohé L. Selenium and redox signaling. Arch Biochem Biophys 2016; 617:48-59. [PMID: 27495740 DOI: 10.1016/j.abb.2016.08.003] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2016] [Accepted: 08/01/2016] [Indexed: 01/06/2023]
Abstract
Selenium compounds that contain selenol functions or can be metabolized to selenols are toxic via superoxide and H2O2 generation, when ingested at dosages beyond requirement. At supra-nutritional dosages various forms of programmed cell death are observed. At physiological intakes, selenium exerts its function as constituent of selenoproteins, which overwhelmingly are oxidoreductases. Out of those, the glutathione peroxidases counteract hydroperoxide-stimulated signaling cascades comprising inflammation triggered by cytokines or lipid mediators, insulin signaling and different forms of programmed cell death. Similar events are exerted by peroxiredoxins, which functionally depend on the selenoproteins of the thioredoxin reductase family. The thiol peroxidases of both families can, however, also act as sensors for hydroperoxides, thereby initiating signaling cascades. Although the interaction of selenoproteins with signaling events has been established by genetic techniques, the in vivo relevance of these findings is still hard to delineate for several reasons: The biosynthesis of individual selenoproteins responds differently to variations of selenium intakes; selenium is preferentially delivered to privileged tissues via inter-organ trafficking and receptor-mediated uptake, and only half of the selenoproteins known by sequence have been functionally characterized. The fragmentary insights do not allow any uncritical use of selenium for optimizing human health.
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Affiliation(s)
| | - Leopold Flohé
- Departamento de Bioquímica, Universidad de la República, 11800 Montevideo, Uruguay; Department of Molecular Medicine, University of Padova, I-35121 Padova, Italy
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80
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Xu H, Li C, Zeng Q, Agrawal I, Zhu X, Gong Z. Genome-wide identification of suitable zebrafish Danio rerio reference genes for normalization of gene expression data by RT-qPCR. JOURNAL OF FISH BIOLOGY 2016; 88:2095-2110. [PMID: 27126589 DOI: 10.1111/jfb.12915] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2015] [Accepted: 01/18/2016] [Indexed: 06/05/2023]
Abstract
In this study, to systematically identify the most stably expressed genes for internal reference in zebrafish Danio rerio investigations, 37 D. rerio transcriptomic datasets (both RNA sequencing and microarray data) were collected from gene expression omnibus (GEO) database and unpublished data, and gene expression variations were analysed under three experimental conditions: tissue types, developmental stages and chemical treatments. Forty-four putative candidate genes were identified with the c.v. <0·2 from all datasets. Following clustering into different functional groups, 21 genes, in addition to four conventional housekeeping genes (eef1a1l1, b2m, hrpt1l and actb1), were selected from different functional groups for further quantitative real-time (qrt-)PCR validation using 25 RNA samples from different adult tissues, developmental stages and chemical treatments. The qrt-PCR data were then analysed using the statistical algorithm refFinder for gene expression stability. Several new candidate genes showed better expression stability than the conventional housekeeping genes in all three categories. It was found that sep15 and metap1 were the top two stable genes for tissue types, ube2a and tmem50a the top two for different developmental stages, and rpl13a and rp1p0 the top two for chemical treatments. Thus, based on the extensive transcriptomic analyses and qrt-PCR validation, these new reference genes are recommended for normalization of D. rerio qrt-PCR data respectively for the three different experimental conditions.
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Affiliation(s)
- H Xu
- Pearl River Fisheries Research Institute, Chinese Academic of Fishery Sciences, Guangzhou 510380, China
- Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
| | - C Li
- Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
| | - Q Zeng
- Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
| | - I Agrawal
- Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
| | - X Zhu
- Pearl River Fisheries Research Institute, Chinese Academic of Fishery Sciences, Guangzhou 510380, China
| | - Z Gong
- Department of Biological Sciences, National University of Singapore, Singapore 117543, Singapore
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81
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Selenium and Metabolic Disorders: An Emphasis on Type 2 Diabetes Risk. Nutrients 2016; 8:80. [PMID: 26861388 PMCID: PMC4772044 DOI: 10.3390/nu8020080] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 02/02/2016] [Indexed: 12/21/2022] Open
Abstract
Selenium (Se) is a micronutrient that maintains biological functions through the action of Se containing proteins known as selenoproteins. Due to the known antioxidant effects of Se, supplements containing Se have been on the rise. While Se supplementation may be beneficial for Se deficient populations, few are at risk for Se deficiency due to the transportation of food from Se-rich regions and the rise of Se-enriched foods. Alarmingly, Se supplementation may have adverse effects in people who already receive an adequate Se supply. Specifically, an increased risk of type 2 diabetes has been reported in individuals with high baseline Se levels. However, this effect was restricted to males, suggesting the relationship between Se and glucose homeostasis may be sexually dimorphic. This review will discuss the current understanding of the interaction between Se and glucose homeostasis, including any sex differences that have been described.
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Knockdown of 15-kDa selenoprotein (Sep15) increases hLE cells' susceptibility to tunicamycin-induced apoptosis. J Biol Inorg Chem 2015; 20:1307-17. [PMID: 26531105 DOI: 10.1007/s00775-015-1309-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Accepted: 10/21/2015] [Indexed: 10/22/2022]
Abstract
In this work, we investigated the effect of Sep15 gene knockdown on apoptosis in human lens epithelial (hLE) cells, trying to understand the relevance of Sep15 to cataract formation in the Sep15 knockout (KO) mice. The results showed that sole knockdown of Sep15 by RNA interference did not result in apoptosis; however, reduction of Sep15 expression aggravated tunicamycin (Tm)-induced cell apoptosis and caspases activation. Furthermore, Tm-induced mitochondrial dysfunction was also exacerbated under the Sep15 knockdown condition by measurement of mitochondrial membrane potential decrease and human cytochrome c release into cytosol. Interestingly, the knockdown of Sep15 exacerbated Tm-induced oxidative stress while endoplasmic reticulum (ER) stress was not correspondingly elevated. These results suggest that the protective role of Sep15 against Tm-induced apoptosis in hLE cells is operated via inhibiting oxidative stress rather than regulating Tm-induced ER stress, and the protective role becomes dependent on Sep15 only in acute stress condition.
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Abstract
SIGNIFICANCE Selenoproteins employ selenium to supplement the chemistry available through the common 20 amino acids. These powerful enzymes are affiliated with redox biology, often in connection with the detection, management, and signaling of oxidative stress. Among them, membrane-bound selenoproteins play prominent roles in signaling pathways, Ca(2+) regulation, membrane complexes integrity, and biosynthesis of lipophilic molecules. RECENT ADVANCES The number of selenoproteins whose physiological roles, protein partners, expression, evolution, and biosynthesis are characterized is steadily increasing, thus offering a more nuanced view of this specialized family. This review focuses on human membrane selenoproteins, particularly the five least characterized ones: selenoproteins I, K, N, S, and T. CRITICAL ISSUES Membrane-bound selenoproteins are the least understood, as it is challenging to provide the membrane-like environment required for their biochemical and biophysical characterization. Hence, their studies rely mostly on biological rather than structural and biochemical assays. Another aspect that has not received much attention is the particular role that their membrane association plays in their physiological function. FUTURE DIRECTIONS Findings cited in this review show that it is possible to infer the structure and the membrane-binding mode of these lesser-studied selenoproteins and design experiments to examine the role of the rare amino acid selenocysteine.
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Affiliation(s)
- Jun Liu
- Department of Chemistry and Biochemistry, University of Delaware , Newark, Delaware
| | - Sharon Rozovsky
- Department of Chemistry and Biochemistry, University of Delaware , Newark, Delaware
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85
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The 811 C/T polymorphism in the 3' untranslated region of the selenoprotein 15-kDa (Sep15) gene and breast cancer in Caucasian women. Tumour Biol 2015; 37:1009-15. [PMID: 26264612 DOI: 10.1007/s13277-015-3847-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 07/24/2015] [Indexed: 12/20/2022] Open
Abstract
The 15-kDa selenoprotein (Sep15) is a selenocysteine-containing oxidoreductase in the endoplasmic reticulum that participates in disulfide-bond formation and protein folding control. The 3'-untranslated region (3'-UTR) contains two exclusively linked, polymorphic sites at positions 811 (C/T) and 1125 (G/A), which result in two functional haplotypes: 811C/1125G or 811T/1125A. The 811T/1125A variant occurs significantly more often in African-Americans as compared to Caucasians and has been linked to increased breast cancer risk in black women. We studied the 811C/T (rs5845) Sep15 gene polymorphism in 182 Caucasian women-83 breast cancer cases and 99 healthy controls-by pyrosequencing and polymerase chain reaction. Associations between allelic variants and clinico-pathological variables (e.g., age, stage of disease, tumor type, grading, and receptor status) were investigated. The genotype distribution in breast cancer patients (CC 63.9 %, CT 33.7 %, TT 2.4 %) and controls (69.7 %, CT 28.3 %, TT 2 %) showed no significant difference (OR 0.77, 95 % CI 0.41-1.42, p = 0.4). The overall low prevalence of the T allele was in accordance with that reported for Caucasians in previous studies. There was no significant association between 811C/T Sep15 polymorphism and any of clinico-pathological parameters. In conclusion, we are the first to report on 811C/T SEP 15 polymorphism in white breast cancer patients. Genotype variation within the 3'-UTR of the SEP 15 gene showed no association with breast cancer risk or clinico-pathological parameters in Caucasian women.
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86
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Bang J, Huh JH, Na JW, Lu Q, Carlson BA, Tobe R, Tsuji PA, Gladyshev VN, Hatfield DL, Lee BJ. Cell Proliferation and Motility Are Inhibited by G1 Phase Arrest in 15-kDa Selenoprotein-Deficient Chang Liver Cells. Mol Cells 2015; 38:457-65. [PMID: 25728752 PMCID: PMC4443288 DOI: 10.14348/molcells.2015.0007] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 01/08/2015] [Accepted: 01/09/2015] [Indexed: 01/08/2023] Open
Abstract
The 15-kDa selenoprotein (Sep15) is a selenoprotein residing in the lumen of the endoplasmic reticulum (ER) and implicated in quality control of protein folding. Herein, we established an inducible RNAi cell line that targets Sep15 mRNA in Chang liver cells. RNAi-induced Sep15 deficiency led to inhibition of cell proliferation, whereas cell growth was resumed after removal of the knockdown inducer. Sep15-deficient cells were arrested at the G1 phase by upregulating p21 and p27, and these cells were also characterized by ER stress. In addition, Sep15 deficiency led to the relocation of focal adhesions to the periphery of the cell basement and to the decrease of the migratory and invasive ability. All these changes were reversible depending on Sep15 status. Rescuing the knockdown state by expressing a silent mutant Sep15 mRNA that is resistant to siRNA also reversed the phenotypic changes. Our results suggest that SEP15 plays important roles in the regulation of the G1 phase during the cell cycle as well as in cell motility in Chang liver cells, and that this selenoprotein offers a novel functional link between the cell cycle and cell motility.
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Affiliation(s)
- Jeyoung Bang
- School of Biological Sciences, Seoul National University, Seoul, 151-742
Korea
- Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul, 151-742
Korea
| | - Jang Hoe Huh
- School of Biological Sciences, Seoul National University, Seoul, 151-742
Korea
| | - Ji-Woon Na
- School of Biological Sciences, Seoul National University, Seoul, 151-742
Korea
| | - Qiao Lu
- School of Biological Sciences, Seoul National University, Seoul, 151-742
Korea
| | - Bradley A. Carlson
- Mouse Cancer Genetics Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Ryuta Tobe
- Mouse Cancer Genetics Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Petra A. Tsuji
- Department of Biological Sciences, Towson University, Towson, MD 21252
| | - Vadim N. Gladyshev
- Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115,
USA
| | - Dolph L. Hatfield
- Mouse Cancer Genetics Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
| | - Byeong Jae Lee
- School of Biological Sciences, Seoul National University, Seoul, 151-742
Korea
- Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul, 151-742
Korea
- Institute of Molecular Biology and Genetics, Seoul National University, Seoul, 151-742
Korea
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Functional analysis of endoplasmic reticulum glucosyltransferase (UGGT): Synthetic chemistry's initiative in glycobiology. Semin Cell Dev Biol 2015; 41:90-8. [DOI: 10.1016/j.semcdb.2014.11.011] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 11/28/2014] [Accepted: 11/28/2014] [Indexed: 01/03/2023]
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88
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Bang J, Jang M, Huh JH, Na JW, Shim M, Carlson BA, Tobe R, Tsuji PA, Gladyshev VN, Hatfield DL, Lee BJ. Deficiency of the 15-kDa selenoprotein led to cytoskeleton remodeling and non-apoptotic membrane blebbing through a RhoA/ROCK pathway. Biochem Biophys Res Commun 2015; 456:884-90. [PMID: 25529450 PMCID: PMC4758352 DOI: 10.1016/j.bbrc.2014.12.059] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 12/11/2014] [Indexed: 01/20/2023]
Abstract
The 15-kDa selenoprotein (Sep15) has been implicated in etiology of some types of cancer. Herein, inducible RNAi cell lines were established and cell morphology and motility were analyzed. The majority of Sep15-deficient cells (>95%) formed membrane blebs in a dynamic manner. Blebbing cells transformed cell morphology from a normal flat spindle shape to a spherical morphology. In blebbing cells, actin fibers moved to the cell periphery, covering and obscuring visualization of α-tubulin. Bleb formation was suppressed by the inhibitors of Rho-associated protein kinase (ROCK), RhoA or myosin light chain (MLC), restoring blebbing cells to wild-type morphology. RhoA activation and phosphorylation of myosin phosphatase target subunit 1 was induced by Sep15 knockdown. Sep15-deficient cells were non-apoptotic, and displayed a distinct relative localization of F-actin and α-tubulin from typical apoptotic blebbing cells. Our data suggest that Sep15 in Chang liver cells regulates the pathway that antagonizes RhoA/ROCK/MLC-dependent non-apoptotic bleb formation.
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Affiliation(s)
- Jeyoung Bang
- School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea; Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul 151-742, Republic of Korea
| | - Mihyun Jang
- School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Jang Hoe Huh
- School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Ji-Woon Na
- School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea
| | - Myoungsup Shim
- School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea; Institute of Molecular Biology and Genetics, Seoul National University, Seoul 151-742, Republic of Korea
| | - Bradley A Carlson
- Mouse Cancer Genetics Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Ryuta Tobe
- Mouse Cancer Genetics Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Petra A Tsuji
- Department of Biological Sciences, Towson University, Towson, MD 21252, USA
| | - Vadim N Gladyshev
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Dolph L Hatfield
- Mouse Cancer Genetics Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
| | - Byeong Jae Lee
- School of Biological Sciences, Seoul National University, Seoul 151-742, Republic of Korea; Interdisciplinary Program in Bioinformatics, Seoul National University, Seoul 151-742, Republic of Korea; Institute of Molecular Biology and Genetics, Seoul National University, Seoul 151-742, Republic of Korea.
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89
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Cardoso BR, Roberts BR, Bush AI, Hare DJ. Selenium, selenoproteins and neurodegenerative diseases. Metallomics 2015; 7:1213-28. [DOI: 10.1039/c5mt00075k] [Citation(s) in RCA: 164] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A review of selenium's essential role in normal brain function and its potential involvement in neurodegenerative diseases.
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Affiliation(s)
- Bárbara Rita Cardoso
- The Florey Institute of Neuroscience and Mental Health
- The University of Melbourne
- Parkville, Australia
- Faculty of Pharmaceutical Sciences
- Department of Food and Experimental Nutrition
| | - Blaine R. Roberts
- The Florey Institute of Neuroscience and Mental Health
- The University of Melbourne
- Parkville, Australia
| | - Ashley I. Bush
- The Florey Institute of Neuroscience and Mental Health
- The University of Melbourne
- Parkville, Australia
| | - Dominic J. Hare
- The Florey Institute of Neuroscience and Mental Health
- The University of Melbourne
- Parkville, Australia
- Elemental Bio-imaging Facility
- University of Technology Sydney
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90
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Guerriero E, Accardo M, Capone F, Colonna G, Castello G, Costantini S. Assessment of the Selenoprotein M (SELM) over-expression on human hepatocellular carcinoma tissues by immunohistochemistry. Eur J Histochem 2014; 58:2433. [PMID: 25578973 PMCID: PMC4289845 DOI: 10.4081/ejh.2014.2433] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Revised: 10/20/2014] [Accepted: 10/22/2014] [Indexed: 11/22/2022] Open
Abstract
Selenium is an essential trace mineral of fundamental importance to human healthy and exerts its biological function through selenoproteins. In particular, Selenoprotein M (SELM) is located in the endoplasmic reticulum and contains the common redox motif of cysteine-X-X-selenocysteine type. It attracts great attention due to its high expression in brain and its potential roles as antioxidant, neuroprotective, and cytosolic calcium regulator. Recently, our group found SELM over-expression in human hepatocellular carcinoma (HCC) cell lines. In this report some paraffin-embedded tissues from liver biopsy of patients with hepatitis C virus (HCV)-related cirrhosis and HCC were immunohistochemically stained and SELM expression scoring was evaluated. Our results evidence for the first time an increase of SELM expression in HCC liver tissues, and its gradual expression raise associated with an increased malignancy grade. Therefore, we propose to use i) SELM as putative marker for HCC as well as ii) simple immunohistochemistry technique to distinguish between the different grades of malignancy.
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91
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Sun H, Deng T, Fu J. Chicken 15-kDa selenoprotein plays important antioxidative function in splenocytes. Biol Trace Elem Res 2014; 161:288-96. [PMID: 25249069 DOI: 10.1007/s12011-014-0126-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Accepted: 09/09/2014] [Indexed: 01/01/2023]
Abstract
The 15-kDa selenoprotein (Sep15) is a thioredoxin-like protein. The expression of Sep15 is regulated by dietary selenium (Se) and plays important roles in mammals. However, the structure and function of chicken Sep15 and its response to Se are still unclear. In the present study, we replicated the chicken Se deficiency models and Sep15 deficiency models in splenocytes. Then, the homology, structure analysis, and levels of Sep15 were analyzed. In addition, the oxidative stress levels were examined in Sep15 deficiency splenocytes. The results indicated that chicken Sep15 preserved high similarity with that of other 14 animals in the coding nucleotide sequences (CDS) and deduced amino acid sequence, which suggested that chicken Sep15 may be derived from the same ancestor with other animals. The predicted structure and function showed that chicken Sep15 preserved the conserved thioredoxin-like fold CxU, which suggested an antioxidative function. Chicken Sep15 was also decreased by Se deficiency in immune organs (P < 0.05). In addition, Sep15 deficiency induced the occurrence of higher oxidative stress and enhanced the sensitivity of cells to H2O2 (P < 0.05). So the in vitro study further verified its antioxidative function. Thus, similar to its mammal homolog, chicken Sep15 preserves the typical characteristic of selenoprotein and may play some roles in the redox regulation.
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Affiliation(s)
- Huijie Sun
- College of Computer Science and Technology, Harbin Engineering University, Harbin, 150001, People's Republic of China
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92
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Pitts MW, Byrns CN, Ogawa-Wong AN, Kremer P, Berry MJ. Selenoproteins in nervous system development and function. Biol Trace Elem Res 2014; 161:231-45. [PMID: 24974905 PMCID: PMC4222985 DOI: 10.1007/s12011-014-0060-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 06/23/2014] [Indexed: 01/03/2023]
Abstract
Selenoproteins are a distinct class of proteins that are characterized by the co-translational incorporation of selenium (Se) in the form of the 21st amino acid selenocysteine. Selenoproteins provide a key defense against oxidative stress, as many of these proteins participate in oxidation-reduction reactions neutralizing reactive oxygen species, where selenocysteine residues act as catalytic sites. Many selenoproteins are highly expressed in the brain, and mouse knockout studies have determined that several are required for normal brain development. In parallel with these laboratory studies, recent reports of rare human cases with mutations in genes involved in selenoprotein biosynthesis have described individuals with an assortment of neurological problems that mirror those detailed in knockout mice. These deficits include impairments in cognition and motor function, seizures, hearing loss, and altered thyroid metabolism. Additionally, due to the fact that oxidative stress is a key feature of neurodegenerative disease, there is considerable interest in the therapeutic potential of selenium supplementation for human neurological disorders. Studies performed in cell culture and rodent models have demonstrated that selenium administration attenuates oxidative stress, prevents neurodegeneration, and counters cell signaling mechanisms known to be dysregulated in certain disease states. However, there is currently no definitive evidence in support of selenium supplementation to prevent and/or treat common neurological conditions in the general population. It appears likely that, in humans, supplementation with selenium may only benefit certain subpopulations, such as those that are either selenium-deficient or possess genetic variants that affect selenium metabolism.
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Affiliation(s)
- Matthew W Pitts
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, 651 Ilalo St, Honolulu, HI, 96813, USA,
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93
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Rose AH, Hoffmann PR. Selenoproteins and cardiovascular stress. Thromb Haemost 2014; 113:494-504. [PMID: 25354851 DOI: 10.1160/th14-07-0603] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Accepted: 09/18/2014] [Indexed: 02/07/2023]
Abstract
Dietary selenium (Se) is an essential micronutrient that exerts its biological effects through its incorporation into selenoproteins. This family of proteins contains several antioxidant enzymes such as the glutathione peroxidases, redox-regulating enzymes such as thioredoxin reductases, a methionine sulfoxide reductase, and others. In this review, we summarise the current understanding of the roles these selenoproteins play in protecting the cardiovascular system from different types of stress including ischaemia-reperfusion, homocysteine dysregulation, myocardial hypertrophy, doxirubicin toxicity, Keshan disease, and others.
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Affiliation(s)
| | - Peter R Hoffmann
- Peter R. Hoffmann, University of Hawaii, John A. Burns School of Medicine, 651 Ilalo Street, Honolulu, HI 96813, USA, Fax: +1 808 692 1968, E-mail:
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94
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Metanis N, Hilvert D. Natural and synthetic selenoproteins. Curr Opin Chem Biol 2014; 22:27-34. [DOI: 10.1016/j.cbpa.2014.09.010] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 09/07/2014] [Accepted: 09/08/2014] [Indexed: 12/11/2022]
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95
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Labunskyy VM, Hatfield DL, Gladyshev VN. Selenoproteins: molecular pathways and physiological roles. Physiol Rev 2014; 94:739-77. [PMID: 24987004 DOI: 10.1152/physrev.00039.2013] [Citation(s) in RCA: 812] [Impact Index Per Article: 81.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Selenium is an essential micronutrient with important functions in human health and relevance to several pathophysiological conditions. The biological effects of selenium are largely mediated by selenium-containing proteins (selenoproteins) that are present in all three domains of life. Although selenoproteins represent diverse molecular pathways and biological functions, all these proteins contain at least one selenocysteine (Sec), a selenium-containing amino acid, and most serve oxidoreductase functions. Sec is cotranslationally inserted into nascent polypeptide chains in response to the UGA codon, whose normal function is to terminate translation. To decode UGA as Sec, organisms evolved the Sec insertion machinery that allows incorporation of this amino acid at specific UGA codons in a process requiring a cis-acting Sec insertion sequence (SECIS) element. Although the basic mechanisms of Sec synthesis and insertion into proteins in both prokaryotes and eukaryotes have been studied in great detail, the identity and functions of many selenoproteins remain largely unknown. In the last decade, there has been significant progress in characterizing selenoproteins and selenoproteomes and understanding their physiological functions. We discuss current knowledge about how these unique proteins perform their functions at the molecular level and highlight new insights into the roles that selenoproteins play in human health.
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Affiliation(s)
- Vyacheslav M Labunskyy
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts; and Molecular Biology of Selenium Section, Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Dolph L Hatfield
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts; and Molecular Biology of Selenium Section, Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
| | - Vadim N Gladyshev
- Division of Genetics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts; and Molecular Biology of Selenium Section, Mouse Cancer Genetics Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
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96
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Adamson S, Browning R, Singh P, Nobles S, Villarreal A, Karim S. Transcriptional activation of antioxidants may compensate for selenoprotein deficiencies in Amblyomma maculatum (Acari: Ixodidae) injected with selK- or selM-dsRNA. INSECT MOLECULAR BIOLOGY 2014; 23:497-510. [PMID: 24698418 PMCID: PMC4107163 DOI: 10.1111/imb.12098] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The Gulf-Coast tick, Amblyomma maculatum, possesses an elaborate set of selenoproteins, which prevent the deleterious effects from oxidative stress that would otherwise occur during feeding. In the current work, we examined the role of selenoprotein K (SelK) and selenoprotein M (SelM) in feeding A. maculatum by bioinformatics, transcriptional gene expression, RNA interference and antioxidant assays. The transcriptional expression of SelK did not vary significantly in salivary glands or midguts throughout the bloodmeal. However, there was a 58-fold increase in transcript levels of SelM in tick midguts. Ticks injected with selK-dsRNA or selM-dsRNA did not reveal any observable differences in egg viability but oviposition was reduced. Surprisingly, salivary antioxidant activity was higher in selenoprotein knockouts compared with controls, which is probably the result of compensatory transcriptional expression of genes involved in combating reactive oxygen species. In fact, quantitative real-time PCR data suggest that the transcriptional expression of catalase increased in ticks injected with selM-double-stranded RNA. Additionally, the transcriptional expression of selN decreased ∼90% in both SelK/SelM knockdowns. These data indicate that SelK and SelM are salivary antioxidants but are not essential for tick survival or reproduction and are compensated by other antioxidant systems.
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Affiliation(s)
- S Adamson
- Department of Biological Sciences, The University of Southern Mississippi, Hattiesburg, MS, USA
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97
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Structure–function relationship and evolutionary history of the human selenoprotein M (SelM) found over-expressed in hepatocellular carcinoma. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:447-56. [DOI: 10.1016/j.bbapap.2013.12.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Revised: 11/28/2013] [Accepted: 12/02/2013] [Indexed: 11/17/2022]
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98
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Takeda Y, Seko A, Hachisu M, Daikoku S, Izumi M, Koizumi A, Fujikawa K, Kajihara Y, Ito Y. Both isoforms of human UDP-glucose:glycoprotein glucosyltransferase are enzymatically active. Glycobiology 2014; 24:344-50. [DOI: 10.1093/glycob/cwt163] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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99
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Roman M, Jitaru P, Barbante C. Selenium biochemistry and its role for human health. Metallomics 2014; 6:25-54. [DOI: 10.1039/c3mt00185g] [Citation(s) in RCA: 421] [Impact Index Per Article: 42.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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100
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Galectin-1 is an interactive protein of selenoprotein M in the brain. Int J Mol Sci 2013; 14:22233-45. [PMID: 24284396 PMCID: PMC3856062 DOI: 10.3390/ijms141122233] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 10/24/2013] [Accepted: 10/24/2013] [Indexed: 11/17/2022] Open
Abstract
Selenium, an essential trace element for human health, mainly exerts its biological function through selenoproteins. Selenoprotein M (SelM) is one of the highly expressed selenoproteins in the brain, but its biological effect and molecular mechanism remain unclear. Thus, the interactive protein of SelM was investigated in this paper to guide further study. In order to avoid protein translational stop, the selenocysteine-encoding UGA inside the open reading frame of SelM was site-directly changed to the cysteine-encoding UGC to generate the SelM' mutant. Meanwhile, its N terminal transmembrane signal peptide was also cut off. This truncated SelM' was used to screen a human fetal brain cDNA library by the yeast two-hybrid system. A new interactive protein of SelM' was found to be galectin-1 (Gal-1). This protein-protein interaction was further verified by the results of fluorescence resonance energy transfer techniques, glutathione S-transferase pull-down and co-immunoprecipitation assays. As Gal-1 plays important roles in preventing neurodegeneration and promoting neuroprotection in the brain, the interaction between SelM' and Gal-1 displays a new direction for studying the biological function of SelM in the human brain.
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