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Liu F, Last KS, Henry TB, Reinardy HC. Interspecific differences in oxidative DNA damage after hydrogen peroxide exposure of sea urchin coelomocytes. Mutagenesis 2022; 38:13-20. [PMID: 36130095 PMCID: PMC9897020 DOI: 10.1093/mutage/geac018] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 09/07/2022] [Indexed: 02/07/2023] Open
Abstract
Interspecific comparison of DNA damage can provide information on the relative vulnerability of marine organisms to toxicants that induce oxidative genotoxicity. Hydrogen peroxide (H2O2) is an oxidative toxicant that causes DNA strand breaks and nucleotide oxidation and is used in multiple industries including Atlantic salmon aquaculture to treat infestations of ectoparasitic sea lice. H2O2 (up to 100 mM) can be released into the water after sea lice treatment, with potential consequences of exposure in nontarget marine organisms. The objective of the current study was to measure and compare differences in levels of H2O2-induced oxidative DNA damage in coelomocytes from Scottish sea urchins Echinus esculentus, Paracentrotus lividus, and Psammechinus miliaris. Coelomocytes were exposed to H2O2 (0-50 mM) for 10 min, cell concentration and viability were quantified, and DNA damage was measured by the fast micromethod, an alkaline unwinding DNA method, and the modified fast micromethod with nucleotide-specific enzymes. Cell viability was >92% in all exposures and did not differ from controls. Psammechinus miliaris coelomocytes had the highest oxidative DNA damage with 0.07 ± 0.01, 0.08 ± 0.01, and 0.07 ± 0.01 strand scission factors (mean ± SD) after incubation with phosphate-buffered saline, formamidopyrimidine-DNA glycosylase, and endonuclease-III, respectively, at 50 mM H2O2. Exposures to 0.5 mM H2O2 (100-fold dilution from recommended lice treatment concentration) induced oxidative DNA damage in all three species of sea urchins, suggesting interspecific differences in vulnerabilities to DNA damage and/or DNA repair mechanisms. Understanding impacts of environmental genotoxicants requires understanding species-specific susceptibilities to DNA damage, which can impact long-term stability in sea urchin populations in proximity to aquaculture farms.
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Affiliation(s)
- Fengjia Liu
- The Scottish Association for Marine Science, Oban, United Kingdom
| | - Kim S Last
- The Scottish Association for Marine Science, Oban, United Kingdom
| | - Theodore B Henry
- Institute of Earth and Life Sciences, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, United Kingdom,Center for Environmental Biotechnology, The University of Tennessee, Knoxville, Knoxville, TN, United States
| | - Helena C Reinardy
- Corresponding author. Scottish Association for Marine Science, Oban, Argyll PA37 1QA, UK. E-mail: ;
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Sex Bias in Differentiated Thyroid Cancer. Int J Mol Sci 2021; 22:ijms222312992. [PMID: 34884794 PMCID: PMC8657786 DOI: 10.3390/ijms222312992] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/22/2021] [Accepted: 11/29/2021] [Indexed: 01/03/2023] Open
Abstract
Differentiated thyroid cancers are more frequent in women than in men. These different frequencies may depend on differences in patient's behavior and in thyroid investigations. However, an impact on sexual hormones is likely, although this has been insufficiently elucidated. Estrogens may increase the production of mutagenic molecules in the thyroid cell and favor the proliferation and invasion of tumoral cells by regulating both the thyrocyte enzymatic machinery and the inflammatory process associated with tumor growth. On the other hand, the worse prognosis of thyroid cancer associated with the male gender is poorly explained.
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Khoruzhenko A, Miot F, Massart C, Van Sande J, Dumont JE, Beauwens R, Boom A. Functional model of rat thyroid follicles cultured in Matrigel. Endocr Connect 2021; 10:570-578. [PMID: 33909590 PMCID: PMC8183616 DOI: 10.1530/ec-21-0169] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 04/28/2021] [Indexed: 11/11/2022]
Abstract
BACKGROUND Long-term maintenance of functional activity of thyroid cells is an essential requirement for basic in vitro studies on the physiology and pathology of the thyroid. An important prerequisite of thyrocytes' functional activity in vivo and in vitro is their follicle organization. AIM This study aimed at developing a method of cultivation of functionally active rat thyroid follicles in Matrigel under three-dimensional conditions. METHODS Undamaged rat thyroid follicles were isolated by enzymatic digestion with collagenase/dispase, then embedded into Matrigel, and cultivated for 2 weeks. Thyroglobulin, thyroxine and zonula occludens-1 (ZO-1) localization were revealed by immunofluorescence analysis. Iodide organification was tested by protein-bound 125I (PBI) measurement. RESULTS Integrity of the follicles was preserved during the whole period of cultivation and was confirmed by 3D reconstruction of ZO-1 localization. Thyroglobulin was detected in the thyrocyte cytoplasm, as well as in the intrafollicular lumen. Thyroxine was observed predominantly at the apical side of thyrocytes. Also, generated cultures were characterized by a high level of iodide organification: PB125I represented 39% of the total radioactivity in the Matrigel drop embedding the follicles; at the same time, methimazole almost totally inhibited this process (0.2% of total radioactivity). CONCLUSION The method of rat thyrocyte cultivation in Matrigel, as described here allows to maintain the structural integrity and the functional activity of thyroid follicles in vitro and could be used for wide ranges of basic and applied researches in thyroidology.
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Affiliation(s)
- Antonina Khoruzhenko
- Institute of Interdisciplinary Research (IRIBHM), Université libre de Bruxelles, Brussels, Belgium
- Institute of Molecular Biology and Genetics, NAS of Ukraine, Kiev, Ukraine
| | - Françoise Miot
- Institute of Interdisciplinary Research (IRIBHM), Université libre de Bruxelles, Brussels, Belgium
| | - Claude Massart
- Institute of Interdisciplinary Research (IRIBHM), Université libre de Bruxelles, Brussels, Belgium
| | - Jacqueline Van Sande
- Institute of Interdisciplinary Research (IRIBHM), Université libre de Bruxelles, Brussels, Belgium
| | - Jacques Emile Dumont
- Institute of Interdisciplinary Research (IRIBHM), Université libre de Bruxelles, Brussels, Belgium
| | - Renaud Beauwens
- Laboratory of Physiology and Pharmacology, Université libre de Bruxelles, Brussels, Belgium
| | - Alain Boom
- Laboratoire d’Histologie, de Neuroanatomie et de Neuropathologie, Université libre de Bruxelles, Brussels, Belgium
- Correspondence should be addressed to A Boom:
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Arczewska KD, Krasuska W, Stachurska A, Karpińska K, Sikorska J, Kiedrowski M, Lange D, Stępień T, Czarnocka B. hMTH1 and GPX1 expression in human thyroid tissue is interrelated to prevent oxidative DNA damage. DNA Repair (Amst) 2020; 95:102954. [PMID: 32877752 DOI: 10.1016/j.dnarep.2020.102954] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 08/09/2020] [Accepted: 08/13/2020] [Indexed: 12/14/2022]
Abstract
Oxidative stress (OS) is recognized as disturbance of cellular equilibrium between reactive oxygen species (ROS) formation and their elimination by antioxidant defense systems. One example of ROS-mediated damage is generation of potentially mutagenic DNA precursor, 8-oxodGTP. In human cells genomic 8-oxodGTP incorporation is prevented by the MutT homologue 1 (MTH1 or hMTH1 for human MTH1) protein. It is well established that malignant cells, including thyroid cancer cells, require hMTH1 for maintaining proliferation and cancerous transformation phenotype. Above observations led to the development of hMTH1 inhibitors as novel anticancer therapeutics. In the current study we present extensive analysis of oxidative stress responses determining sensitivity to hMTH1 deficiency in cultured thyroid cells. We observe here that hMTH1 depletion results in downregulation of several glutathione-dependent OS defense system factors, including GPX1 and GCLM, making some of the tested thyroid cell lines highly dependent on glutathione levels. This is evidenced by the increased ROS burden and enhanced proliferation defect after combination of hMTH1 siRNA and glutathione synthesis inhibition. Moreover, due to the lack of data on hMTH1 expression in human thyroid tumor specimens we decided to perform detailed analysis of hMTH1 expression in thyroid tumor and peri-tumoral tissues from human patients. Our results allow us to propose here that anticancer activity of hMTH1 suppression may be boosted by combination with agents modulating glutathione pool, but further studies are necessary to precisely identify backgrounds susceptible to such combination treatment.
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Affiliation(s)
- Katarzyna D Arczewska
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813 Warsaw, Poland.
| | - Wanda Krasuska
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813 Warsaw, Poland
| | - Anna Stachurska
- Department of Immunohematology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813 Warsaw, Poland
| | - Kamila Karpińska
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813 Warsaw, Poland; Laboratory of the Molecular Biology of Cancer, Centre of New Technologies, University of Warsaw, S. Banacha 2c, 02-097 Warsaw, Poland
| | - Justyna Sikorska
- Department of Immunohematology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813 Warsaw, Poland
| | - Mirosław Kiedrowski
- Clinical Department of Oncology and Hematology, Central Clinical Hospital of the Ministry of Interior and Administration in Warsaw, Center of Postgraduate Medical Education, Wołowska 137, 02-507 Warsaw, Poland
| | - Dariusz Lange
- Tumor Pathology Department, Maria Skłodowska-Curie National Research Institute of Oncology, Gliwice Branch, Wybrzeże Armii Krajowej 15, 44-102 Gliwice, Poland
| | - Tomasz Stępień
- Department of General and Endocrinological Surgery, Copernicus Memorial Hospital, Pabianicka 62, 93-036 Łódź, Poland
| | - Barbara Czarnocka
- Department of Biochemistry and Molecular Biology, Centre of Postgraduate Medical Education, Marymoncka 99/103, 01-813 Warsaw, Poland
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Ruggeri RM, CampennÌ A, Giuffrida G, Casciaro M, Barbalace MC, Hrelia S, Trimarchi F, CannavÒ S, Gangemi S. Oxidative stress as a key feature of autoimmune thyroiditis: an update. MINERVA ENDOCRINOL 2020; 45:326-344. [PMID: 32969631 DOI: 10.23736/s0391-1977.20.03268-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Oxidative stress has been proposed as one of the factors concurring in the pathophysiology of autoimmune thyroid diseases. Reactive oxygen species are the main expression of oxidative stress in biological systems, and their production can overcome antioxidant defenses ultimately leading to cell damage, apoptosis, and death. The present review was aimed at describing the state of the art of the relationships between oxidative stress and autoimmune thyroiditis. The most used biomarkers of oxidative stress and their correlation with thyroid function are reported. EVIDENCE ACQUISITION We conducted a search of the literature in the English language starting from 2000, using the following search terms: "Hashimoto thyroiditis," "autoimmune thyroiditis," "hypothyroidism," "hyperthyroidism," "oxidative stress," "oxidants," "antioxidant," "advanced glycation end products." Both clinical studies and animal models were evaluated. EVIDENCE SYNTHESIS Data form clinical studies clearly indicate that the balance between oxidants and antioxidants is shifted towards the oxidative side in patients with autoimmune thyroiditis, suggesting that oxidative stress may be a key event in the pathophysiology of the disease, irrespective of thyroid function. Studies in animal models, such as the NOD.H2h4 mouse, confirm that thyroidal accumulation of ROS plays a role in the initiation and progression of autoimmune thyroiditis. CONCLUSIONS Oxidant/antioxidant imbalance represent a key feature of thyroid autoimmunity. Oxidative stress parameters could be used as biochemical markers of chronic inflammation, to better predict the disease evolution along its natural history. Dietary habits and antioxidant supplements may provide protection from autoimmunity, opening new perspectives in the development of more tailored therapies.
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Affiliation(s)
- Rosaria M Ruggeri
- Department of Clinical and Experimental Medicine, Gaetano Martino University Hospital, University of Messina, Messina, Italy - .,Unit of Endocrinology, University Hospital of Messina, Messina, Italy -
| | - Alfredo CampennÌ
- Department of Biomedical Sciences and Morpho-Functional Imaging, University of Messina, Messina, Italy
| | - Giuseppe Giuffrida
- Department of Clinical and Experimental Medicine, Gaetano Martino University Hospital, University of Messina, Messina, Italy.,Unit of Endocrinology, University Hospital of Messina, Messina, Italy
| | - Marco Casciaro
- Unit of Allergology and Clinical Immunology, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Maria C Barbalace
- Department of Life Quality Studies, University of Bologna, Bologna, Italy
| | - Silvana Hrelia
- Department of Life Quality Studies, University of Bologna, Bologna, Italy
| | | | - Salvatore CannavÒ
- Unit of Endocrinology, University Hospital of Messina, Messina, Italy.,Department of Human Pathology DETEV, University of Messina, Messina, Italy
| | - Sebastiano Gangemi
- Unit of Allergology and Clinical Immunology, Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
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Ruggeri RM, D'Ascola A, Vicchio TM, Campo S, Gianì F, Giovinazzo S, Frasca F, Cannavò S, Campennì A, Trimarchi F. Selenium exerts protective effects against oxidative stress and cell damage in human thyrocytes and fibroblasts. Endocrine 2020; 68:151-162. [PMID: 31889242 DOI: 10.1007/s12020-019-02171-w] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 12/21/2019] [Indexed: 12/11/2022]
Abstract
PURPOSE Selenium, incorporated into specific seleno-enzymes, is essential to proper thyroid function and protect cells from oxidative damage induced by H2O2 during thyroid hormone synthesis. Several studies indicated that low selenium levels are associated with thyroid autoimmunity and related disorders, but real effectiveness of selenium supplementation in such diseases is still controversial. We evaluated the effect of selenium on oxidative damage in human thyrocytes and thyroid fibroblasts in vitro. METHODS To induce oxidative stress, primary cultures were exposed to H2O2, in the presence or the absence of selenium, as either selenomethionine or selenite. We performed the following assays: cell viability, caspase-3 activity, BCL-2/BAX gene expression, DNA fragmentation, malondialdehyde levels, and glutathione peroxidase (GPx) activity measurements. RESULTS Thyrocytes and thyroid fibroblasts exposed to H2O2 and preincubated with both selenocompounds displayed a significant dose-dependent increase in cell viability compared to cells incubated with H2O2 alone. Pretreatment with selenomethionine and selenite significantly reduced caspase-3 activity and BAX mRNA levels and increased BCL-2 mRNA levels in a dose-dependent manner. Accordingly, H2O2 induced a diffuse pattern of DNA degradation and an increase in malondialdehyde levels, which was prevented by the pretreatment with both selenomethionine and selenite. Both selenocompounds induced an increase in GPx activity, suggesting that these protective effects may be, almost in part, mediated by these selenoproteins. CONCLUSION In human thyrocytes and fibroblasts in vitro, selenium exerts protective effects against H2O2 in a dose-dependent manner, being selenite effective at lower doses than selenomethionine.
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Affiliation(s)
- Rosaria M Ruggeri
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy.
- Endocrine Unit, University Hospital AOU Policlinico G. Martino, Messina, Italy.
| | - Angela D'Ascola
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Teresa M Vicchio
- Endocrine Unit, University Hospital AOU Policlinico G. Martino, Messina, Italy
| | - Salvatore Campo
- Department of Clinical and Experimental Medicine, University of Messina, Messina, Italy
| | - Fiorenza Gianì
- Department of Clinical and Experimental Medicine, Endocrinology Unit, University of Catania, Catania, Italy
| | | | - Francesco Frasca
- Department of Clinical and Experimental Medicine, Endocrinology Unit, University of Catania, Catania, Italy
| | - Salvatore Cannavò
- Endocrine Unit, University Hospital AOU Policlinico G. Martino, Messina, Italy
- Department of Human Pathology DETEV, University of Messina, Messina, Italy
| | - Alfredo Campennì
- Department of Biomedical and Dental Sciences and Morfo-Functional Images, Unit of Nuclear Medicine, University of Messina, Messina, Italy
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Kyrilli A, Gacquer D, Detours V, Lefort A, Libert F, Twyffels L, Van Den Eeckhaute L, Strickaert A, Maenhaut C, De Deken X, Dumont JE, Miot F, Corvilain B. Dissecting the Role of Thyrotropin in the DNA Damage Response in Human Thyrocytes after 131I, γ Radiation and H2O2. J Clin Endocrinol Metab 2020; 105:5614560. [PMID: 31701151 DOI: 10.1210/clinem/dgz185] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 10/15/2019] [Accepted: 11/05/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND The early molecular events in human thyrocytes after 131I exposure have not yet been unravelled. Therefore, we investigated the role of TSH in the 131I-induced DNA damage response and gene expression in primary cultured human thyrocytes. METHODS Following exposure of thyrocytes, in the presence or absence of TSH, to 131I (β radiation), γ radiation (3 Gy), and hydrogen peroxide (H2O2), we assessed DNA damage, proliferation, and cell-cycle status. We conducted RNA sequencing to profile gene expression after each type of exposure and evaluated the influence of TSH on each transcriptomic response. RESULTS Overall, the thyrocyte responses following exposure to β or γ radiation and to H2O2 were similar. However, TSH increased 131I-induced DNA damage, an effect partially diminished after iodide uptake inhibition. Specifically, TSH increased the number of DNA double-strand breaks in nonexposed thyrocytes and thus predisposed them to greater damage following 131I exposure. This effect most likely occurred via Gα q cascade and a rise in intracellular reactive oxygen species (ROS) levels. β and γ radiation prolonged thyroid cell-cycle arrest to a similar extent without sign of apoptosis. The gene expression profiles of thyrocytes exposed to β/γ radiation or H2O2 were overlapping. Modulations in genes involved in inflammatory response, apoptosis, and proliferation were observed. TSH increased the number and intensity of modulation of differentially expressed genes after 131I exposure. CONCLUSIONS TSH specifically increased 131I-induced DNA damage probably via a rise in ROS levels and produced a more prominent transcriptomic response after exposure to 131I.
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Affiliation(s)
- Aglaia Kyrilli
- Division of Endocrinology, Erasme Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - David Gacquer
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Vincent Detours
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Anne Lefort
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Frédéric Libert
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Laure Twyffels
- Center for Microscopy and Molecular Imaging (CMMI), Gosselies Biopark, ULB, Gosselies, Belgium
| | - Laura Van Den Eeckhaute
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Aurélie Strickaert
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Carine Maenhaut
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Xavier De Deken
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Jacques Emile Dumont
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Françoise Miot
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
| | - Bernard Corvilain
- Division of Endocrinology, Erasme Hospital, Université Libre de Bruxelles (ULB), Brussels, Belgium
- Institut de Recherche Interdisciplinaire en Biologie Humaine et Moleculaire (IRIBHM), School of Medicine, ULB, Brussels, Belgium
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Gheorghiu ML, Badiu C. Selenium involvement in mitochondrial function in thyroid disorders. Hormones (Athens) 2020; 19:25-30. [PMID: 31960358 DOI: 10.1007/s42000-020-00173-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 01/16/2020] [Indexed: 12/18/2022]
Abstract
Selenium (Se), an important oligoelement, is a component of the antioxidant system. Over the last decade, it has been ever more frequently discussed in the context of thyroid disorders. Graves' disease and Hashimoto's thyroiditis, differentiated thyroid cancer, and even endemic goiter may have common triggers that are activated by excess reactive oxygen species (ROS), which are involved in various stages of the pathogenesis of thyroid disorders. Most oxidative events occur in mitochondria, organelles that contain enzymes with Se as a cofactor. Mitochondria are responsible for the production of ATP in the cell and are also a major site of ROS production. Thyroid hormone status (the thyroid being the organ with the highest concentration of Se in the body) has a profound impact on mitochondria biogenesis. In this review, we focus on the role of Se in mitochondrial function in thyroid disorders with impaired oxidative stress, since both thyroid hormone synthesis and thyroid dysfunction involve ROS. The role of Se deficiency or its excess in relation to mitochondrial dysfunction in the context of thyroid disorders is therefore of interest.
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Affiliation(s)
- Monica Livia Gheorghiu
- Department of Endocrinology, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania
- Department of Endemic Goiter and Its Complications, "C.I. Parhon" National Institute of Endocrinology, Bucharest, Romania
| | - Corin Badiu
- Department of Endocrinology, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.
- Department of Thyroid Related Disorders, "C.I. Parhon" National Institute of Endocrinology, Bucharest, Romania.
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Nicolson NG, Brown TC, Korah R, Carling T. Immune cell infiltrate-associated dysregulation of DNA repair machinery may predispose to papillary thyroid carcinogenesis. Surgery 2020; 167:66-72. [PMID: 31439400 DOI: 10.1016/j.surg.2019.02.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 02/21/2019] [Accepted: 02/21/2019] [Indexed: 11/27/2022]
Abstract
BACKGROUND An altered immune microenvironment may contribute to papillary thyroid cancer development, as immune infiltrates are identified postoperatively in many papillary thyroid cancer cases with or without diagnosed thyroiditis. Oxygen radicals, endogenous or inflammation-induced, can generate DNA damage, which causes mutations when repaired incorrectly. We hypothesized that infiltrating immune cells might promote aberrant DNA repair, predisposing thyrocytes to papillary thyroid cancer. METHODS Quantitative reverse-transcriptase polymerase chain reaction assays measured gene expression in fresh-frozen samples (n = 55). RNA-seq data was obtained for papillary thyroid cancer and normal thyroid samples from the Cancer Genome Atlas (n = 564), and Hashimoto's-affected and normal thyroids from the Genotype-Tissue Expression project (n = 279). Immune cell marker expression levels were compared to histological estimates and to selected DNA repair genes. Immunohistochemistry localized gene expression to specific cell types. RESULTS DNA polymerase theta expression by quantitative reverse-transcriptase Polymerase chain reaction was higher in papillary thyroid cancer and papillary thyroid cancer-adjacent samples than in benign normal thyroid (P < .001). Immune markers including CD4 correlated with DNA polymerase theta expression (r = 0.50) but not other DNA repair genes examined. Benign tissue with Hashimoto's exhibited increased DNA polymerase theta (P < .0001) and CD3E (P < .0001) expression. DNA polymerase theta localized to thyrocytes, not lymphocytes. CONCLUSION We identified a strong correlation between immune cell infiltrate and dysregulated thyrocyte DNA repair genes, likely reflecting a pathway to papillary thyroid cancer development.
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Affiliation(s)
- Norman G Nicolson
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT
| | - Taylor C Brown
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT
| | - Reju Korah
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT
| | - Tobias Carling
- Yale Endocrine Neoplasia Laboratory, Department of Surgery, Yale School of Medicine, New Haven, CT; Section of Endocrine Surgery, Department of Surgery, Yale School of Medicine, New Haven, CT.
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The Dual Oxidase Duox2 stabilized with DuoxA2 in an enzymatic complex at the surface of the cell produces extracellular H 2O 2 able to induce DNA damage in an inducible cellular model. Exp Cell Res 2019; 384:111620. [PMID: 31513783 DOI: 10.1016/j.yexcr.2019.111620] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 09/06/2019] [Accepted: 09/07/2019] [Indexed: 12/21/2022]
Abstract
Thyroid hormone synthesis requires H2O2, produced by two NADPH oxidases, Duox1 and Duox2. To be fully active at the apical pole of the thyrocytes, these enzymes need additional maturation factors DuoxA1 and DuoxA2. The proteins have been shown to be localized at the cell surface, suggesting that they could form a complex with Duox counterparts. We have generated multiple HEK293 Tet-On3G cell lines that express various combinations of DuoxA upon doxycycline induction, in association with a constitutive expression of the Duox enzyme. We compared Duox specific activity, Duox/DuoxA cell surface interactions and the cellular consequences of sustained H2O2 generation. By normalizing H2O2 extracellular production by Duox or DuoxA membrane expression, we have demonstrated that the most active enzymatic complex is Duox2/DuoxA2, compared to Duox1/DuoxA1. A direct cell surface interaction was shown between Duox1/2 and both DuoxA1 and DuoxA2 using the Duolink® technology, Duox1/DuoxA1 and Duox2/DuoxA2 membrane complexes being more stable than the unpaired ones. A significant increase in DNA damage was observed in the nuclei of Duox2/DuoxA2 expressing cells after doxycycline induction and stimulation of Duox catalytic activity. The maturation and activity of Duox2 were drastically impaired when expressed with the glycosylation-defective maturation factor DuoxA2, while the impact of the unglycosylated DuoxA1 mutant on Duox1 membrane expression and activity was rather limited. The present data demonstrate for the first time that H2O2 produced by the Duox2/DuoxA2 cell surface enzymatic complex could provoke potential mutagenic DNA damage in an inducible cellular model, and highlight the importance of the co-expressed partner in the activity and stability of Duox/DuoxA complexes.
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11
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Godlewska M, Banga PJ. Thyroid peroxidase as a dual active site enzyme: Focus on biosynthesis, hormonogenesis and thyroid disorders of autoimmunity and cancer. Biochimie 2019; 160:34-45. [DOI: 10.1016/j.biochi.2019.02.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 02/05/2019] [Indexed: 01/02/2023]
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