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Singh E, Gupta A, Singh P, Jain M, Muthukumaran J, Singh RP, Singh AK. Exploring mammalian heme peroxidases: A comprehensive review on the structure and function of myeloperoxidase, lactoperoxidase, eosinophil peroxidase, thyroid peroxidase and peroxidasin. Arch Biochem Biophys 2024; 761:110155. [PMID: 39278306 DOI: 10.1016/j.abb.2024.110155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2024] [Revised: 08/29/2024] [Accepted: 09/12/2024] [Indexed: 09/18/2024]
Abstract
The peroxidase family of enzymes is a ubiquitous cluster of enzymes primarily responsible for the oxidation of organic and inorganic substrates. The mammalian heme peroxidase subfamily is characterized by a covalently linked heme prosthetic group which plays a key role in the oxidation of halides and psuedohalides into their respective hypohalous acid and hypothiocyanous acid under the influence of H2O2 as substrate. The members of the heme peroxidase family include Lactoperoxidase (LPO), Eosinophil peroxidase (EPO), Myeloperoxidase (MPO), Thyroid peroxidase (TPO) and Peroxidasin (PXDN). The biological activity of LPO, MPO and EPO pertains to antibacterial, antifungal and antiviral while TPO is involved in the biosynthesis of the thyroid hormone and PXDN helps maintain the ECM. While these enzymes play several immunomodulatory roles, aberrations in their activity have been implicated in diseases such as myocardial infarction, asthma and Alzheimer's amongst others. The sequence and structural similarities amongst the members of the family are strikingly high while the substrate specificities and subcellular locations vary. Hence, it becomes important to provide a consortium of information regarding the members to study their biochemical, pathological and clinical function.
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Affiliation(s)
- Ekampreet Singh
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Ayushi Gupta
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Pratyaksha Singh
- School of Biotechnology, Gautam Buddha University, P.C. 201312, Greater Noida, U.P., India
| | - Monika Jain
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Jayaraman Muthukumaran
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India
| | - Rashmi Prabha Singh
- Department of Life Science, Sharda School of Basic Sciences and Research, Sharda University, P.C. 201310, Greater Noida, U.P., India.
| | - Amit Kumar Singh
- Department of Biotechnology, Sharda School of Engineering and Technology, Sharda University, P.C. 201310, Greater Noida, U.P., India.
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Rudresh BB, Tater AK, Barot V, Patel N, Desai A, Mitra S, Deshpande A. Development and experimental validation of 3D QSAR models for the screening of thyroid peroxidase inhibitors using integrated methods of computational chemistry. Heliyon 2024; 10:e29756. [PMID: 38660252 PMCID: PMC11040118 DOI: 10.1016/j.heliyon.2024.e29756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 04/13/2024] [Accepted: 04/15/2024] [Indexed: 04/26/2024] Open
Abstract
The intricate network of glands and organs that makes up the endocrine system. Hormones are used to regulate and synchronize the nervous and physiological systems. The agents which perturbate an endocrine system are called endocrine disruptors and they can eventually affect cellular proliferation and differentiation in target tissues. A subclass of endocrine disruptors known as thyroid disruptors (TDs) or thyroid disrupting chemicals (TDCs) influence the hypothalamo-pituitary-thyroid axis or directly interfere with thyroid function by binding to thyroid hormone receptors. Thyroid hormone levels in circulation are now included in more test guidelines (OECD TG 441, 407, 408, 414, 421/422, 443/416). Although these might be adequate to recognize thyroid adversity, they are unable to explain the underlying mechanism of action. Thyroid peroxidase (TPO) and sodium iodide symporter (NIS), two proteins essential in the biosynthesis of thyroid hormones, are well-accepted molecular targets for inhibition. The screening of a large number of molecules using high throughput screening (HTS) requires a minimum quantity of sample, cost, and time consuming. Whereas 3-dimensional quantitative structure-activity relationship (3D-QSAR) analysis can screen the TDCs before synthesizing a compound. In the present study, the human TPO (hTPO) and NIS (hNIS) structures were modelled using homology modeling and the quality of the structures was validated satisfactorily using MD simulation for 100ns. Further, 190 human TPO inhibitors with IC50 were curated from Comptox and docked with the modelled structure of TPO using D238, H239 and D240 centric grid. The binding conformation of a molecule with low binding energy was used as a reference and the rest other molecules were aligned after generating the possible conformers. The activity-stratified partition was performed for aligned molecules and training set (139), test set (51) were defined. The machine learning models such as k Nearest Neighbor (kNN) and Random Forest (RF) models were built and validated using external experimental dataset containing 10 molecules. Among the 10 molecules, all 10 molecules were identified as TPO inhibitors and demonstrated 100 % accuracy qualitatively. To confirm the selective TPO inhibition all 10 molecules were docked with the modelled structure of hNIS and the results have demonstrated the selective TPO inhibition.
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Affiliation(s)
| | | | - Vaibav Barot
- Jai Research Foundation, Valvada, Vapi, Gujarat, 396105, India
| | - Nitin Patel
- Jai Research Foundation, Valvada, Vapi, Gujarat, 396105, India
| | - Ashita Desai
- Jai Research Foundation, Valvada, Vapi, Gujarat, 396105, India
| | - Sreerupa Mitra
- Jai Research Foundation, Valvada, Vapi, Gujarat, 396105, India
| | - Abhay Deshpande
- Jai Research Foundation, Valvada, Vapi, Gujarat, 396105, India
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Avramidou E, Gkantaras A, Dermitzakis I, Sapalidis K, Manthou ME, Theotokis P. Histological Alterations in Hashimoto's Disease: A Case-Series Ultrastructural Study. MEDICINES (BASEL, SWITZERLAND) 2023; 10:51. [PMID: 37755241 PMCID: PMC10534781 DOI: 10.3390/medicines10090051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/22/2023] [Accepted: 08/25/2023] [Indexed: 09/28/2023]
Abstract
BACKGROUND Hashimoto's thyroiditis (HT) is an autoimmune disease exhibiting stromal fibrosis and follicular cell destruction due to lymphoplasmacytic infiltration. Besides deprecated analyses, histopathological approaches have not employed the use of electron microscopy adequately toward delineating subcellular-level interactions. METHODS Biopsies for ultrastructural investigations were obtained from the thyroids of five patients with HT after a thyroidectomy. Transmission electron microscopy (TEM) was utilized to study representative tissue specimens. RESULTS Examination indicated interstitial extravasated blood cells and a plethora of plasma cells, based on their subcellular identity landmarks. These antibody-secreting cells were profoundly spotted near follicular cells, fibroblasts, and cell debris entrenched in collagenous areas. Pathological changes persistently affected subcellular components of the thyrocytes, including the nucleus, endoplasmic reticulum (ER), Golgi apparatus, mitochondria, lysosomes, and other intracellular vesicles. Interestingly, significant endothelial destruction was observed, specifically in the larger blood vessels, while the smaller vessels appeared comparatively unaffected. CONCLUSIONS Our TEM findings highlight the immune-related alterations occurring within the thyroid stroma. The impaired vasculature component and remodeling have not been described ultrastructurally before; thus, further exploration is needed with regards to angiogenesis in HT in order to achieve successful prognostic, diagnostic, and treatment-monitoring strategies.
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Affiliation(s)
- Eleni Avramidou
- Department of Histology-Embryology, School of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (E.A.); (I.D.); (M.E.M.)
| | - Antonios Gkantaras
- Pediatric Immunology and Rheumatology Referral Centre, First Department of Pediatrics, Ippokration General Hospital, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
| | - Iasonas Dermitzakis
- Department of Histology-Embryology, School of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (E.A.); (I.D.); (M.E.M.)
| | - Konstantinos Sapalidis
- 3rd Surgical Department, “AHEPA” University Hospital, School of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;
| | - Maria Eleni Manthou
- Department of Histology-Embryology, School of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (E.A.); (I.D.); (M.E.M.)
| | - Paschalis Theotokis
- Department of Histology-Embryology, School of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; (E.A.); (I.D.); (M.E.M.)
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Sánchez J, Sánchez Biol A, Múnera Biol M, García E, López JF. Immunoglobulin E and G autoantibodies against eosinophil proteins in children and adults with asthma and healthy subjects. World Allergy Organ J 2023; 16:100742. [PMID: 36941898 PMCID: PMC10024149 DOI: 10.1016/j.waojou.2023.100742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 12/15/2022] [Accepted: 12/21/2022] [Indexed: 02/04/2023] Open
Abstract
Background Autoimmune IgG response has been described in the pathogenesis of asthma in adults, but IgE autoimmunity has been little explored. Considering high levels of blood eosinophils and immunoglobulin E in asthmatic patients, the possibility of IgE autoantibody response to eosinophil proteins arises. Objective To explore the presence of IgE and IgG autoantibodies against Eosinophil peroxidase (EPX) and Eosinophil cationic protein (ECP). Methods Three steps were followed: 1) The frequency of IgE and IgG autoantibodies against EPX and ECP was investigated among asthmatic and healthy subjects. 2) The ability of IgE autoantibodies to induce an inflammatory response (basophil activation) was performed. 3) The capacity of autoantibodies to identify patients with severe asthma was evaluated. Results Asthmatic and healthy subjects had IgE and IgG autoantibodies against EPX and ECP. Anti-EPX IgE was significantly higher in asthmatic patients. Severe asthmatic patients had a higher frequency and higher levels of IgE and IgG autoantibodies compared to healthy subjects. There was not a correlation between autoantibodies and blood eosinophils. Children younger than 14 years of age had IgE and IgG autoantibodies against to EPX and ECP. IgE autoantibodies to EPX and ECP induced basophil activation in asthmatic patients. Conclusion In this study, we identify for the first time IgE autoantibodies against EPX and ECP in adults and children patients with asthma; IgE and IgG autoantibodies against EPX and ECP could serve as a predictive biomarker of the clinical severity.
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Affiliation(s)
- Jorge Sánchez
- Group of Clinical and Experimental Allergy, Clinic “IPS Universitaria”, University of Antioquia. Medellín, Colombia
- Corresponding author. Department of Allergology and Pediatrics, Faculty of Medicine, University of Antioquia. Medellín, Colombia.
| | - Andres Sánchez Biol
- Group of Clinical and Experimental Allergy, Clinic “IPS Universitaria”, University of Antioquia. Medellín, Colombia
- Faculty of Medicine, Corporation University “Rafael Nuñez”, Cartagena, Colombia
| | - Marlon Múnera Biol
- Faculty of Medicine, Corporation University “Rafael Nuñez”, Cartagena, Colombia
| | - Elizabeth García
- Universidad de Los Andes, Fundación Santa Fe de Bogota, Unidad Medica quirúrgica ORL. Bogota, Colombia
| | - Juan-Felipe López
- Group of Clinical and Experimental Allergy, Clinic “IPS Universitaria”, University of Antioquia. Medellín, Colombia
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Molina MF, Pio MG, Scheps KG, Adrover E, Abelleyro MM, Targovnik HM, Rivolta CM. Curating the gnomAD database: Report of novel variants in the thyroid peroxidase gene using in silico bioinformatics algorithms and a literature review. Mol Cell Endocrinol 2022; 558:111748. [PMID: 35995307 DOI: 10.1016/j.mce.2022.111748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/31/2022] [Accepted: 08/01/2022] [Indexed: 12/15/2022]
Abstract
Thyroid peroxidase (TPO) is a membrane-bound glycoprotein located at the apical side of the thyroid follicular cells that catalyzes both iodination and coupling of iodotyrosine residues within the thyroglobulin molecule, leading to the synthesis of thyroid hormone. Variants in TPO cause congenital hypothyroidism (CH) by iodide organification defect and are commonly inherited in an autosomal recessive fashion. In the present work, we report a detailed population analysis and bioinformatic prediction of the TPO variants indexed in the Genome Aggregation Database (gnomAD) v2.1.1. The proportion of missense cysteine variants and nonsense, frameshift, and splice acceptor/donor variants were analyzed in each ethnic group (European (Non-Finnish), European (Finnish), African/African Americans, Latino/Admixed American, East Asian, South Asian, Ashkenazi Jewish, Other). The results showed a clear predominance of frameshift variants in the East Asian (82%) and European (Finnish) (75%) population, whereas the splice site variants predominate in African/African Americans (99.46%), Other (96%), Latino/Admixed American (94%), South Asian (86%), European (Non-Finnish) (56%) and Ashkenazi Jewish (56%) populations. The analysis of the distribution of the variants indexed in gnomAD v2.1.1 database revealed that most missense variants identified in the An peroxidase domain map in exon 8, followed by exons 11, 7 and 9, and finally in descending order by exons 10, 6, 12 and 5. In total, 183 novel TPO variants were described (13 missense cysteine's variants, 158 missense variants involving the An peroxidase domain and 12 splicing acceptor or donor sites variants) which were not reported in the literature and that would have deleterious effects on prediction programs. In the gnomAD v2.1.1 population, the estimated prevalence of heterozygous carriers of the potentially damaging variants was 1:77. In conclusion, we provide an updated and curated reference source of new TPO variants for application in clinical diagnosis and genetic counseling. Also, this work contributes to elucidating the molecular basis of CH associated with TPO defects.
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Affiliation(s)
- Maricel F Molina
- Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología, Biotecnología y Genética/Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina
| | - Mauricio Gomes Pio
- Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología, Biotecnología y Genética/Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina
| | - Karen G Scheps
- Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología, Biotecnología y Genética/Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina
| | - Ezequiela Adrover
- Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología, Biotecnología y Genética/Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina
| | - Miguel M Abelleyro
- CONICET-Academia Nacional de Medicina, Instituto de Medicina Experimental (IMEX), Buenos Aires, Argentina
| | - Héctor M Targovnik
- Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología, Biotecnología y Genética/Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina
| | - Carina M Rivolta
- Universidad de Buenos Aires. Facultad de Farmacia y Bioquímica. Departamento de Microbiología, Inmunología, Biotecnología y Genética/Cátedra de Genética, Buenos Aires, Argentina; CONICET-Universidad de Buenos Aires, Instituto de Inmunología, Genética y Metabolismo (INIGEM), Buenos Aires, Argentina.
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Bogusławska J, Godlewska M, Gajda E, Piekiełko-Witkowska A. Cellular and molecular basis of thyroid autoimmunity. Eur Thyroid J 2022; 11:ETJ-21-0024. [PMID: 34981746 PMCID: PMC9142813 DOI: 10.1530/etj-21-0024] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 11/01/2021] [Indexed: 11/08/2022] Open
Abstract
Autoimmune thyroid disease (AITD) is the most common human autoimmune disease. The two major clinical manifestations of AITD are Graves' disease and Hashimoto's thyroiditis (HT). AITD is characterized by lymphocytic infiltration of the thyroid gland, leading either to follicular cell damage, thyroid gland destruction, and development of hypothyroidism (in HT) or thyroid hyperplasia, induced by thyroid antibodies which activate thyrotropin receptor (TSHR) on thyrocytes, leading to hyperthyroidism. The aim of this review is to present up-to-date picture of the molecular and cellular mechanisms that underlie the pathology of AITD. Based on studies involving patients, animal AITD models, and thyroid cell lines, we discuss the key events leading to the loss of immune tolerance to thyroid autoantigens as well as the signaling cascades leading to the destruction of thyroid gland. Special focus is given on the interplay between the environmental and genetic factors, as well as ncRNAs and microbiome contributing to AITD development. In particular, we describe mechanistic models by which SNPs in genes involved in immune regulation and thyroid function, such as CD40, TSHR, FLT3, and PTPN22, underlie AITD predisposition. The clinical significance of novel diagnostic and prognostic biomarkers based on ncRNAs and microbiome composition is also underscored. Finally, we discuss the possible significance of probiotic supplementation on thyroid function in AITD.
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Affiliation(s)
- Joanna Bogusławska
- Centre of Postgraduate Medical Education, Department of Biochemistry and Molecular Biology, Warsaw, Poland
| | - Marlena Godlewska
- Centre of Postgraduate Medical Education, Department of Biochemistry and Molecular Biology, Warsaw, Poland
| | - Ewa Gajda
- Centre of Postgraduate Medical Education, Department of Biochemistry and Molecular Biology, Warsaw, Poland
| | - Agnieszka Piekiełko-Witkowska
- Centre of Postgraduate Medical Education, Department of Biochemistry and Molecular Biology, Warsaw, Poland
- Correspondence should be addressed to A Piekiełko-Witkowska:
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Choi KM, Joo MS, Kang G, Woo WS, Kim KH, Jeong SH, Son MY, Kim DH, Park CI. First report of eosinophil peroxidase in starry flounder (Platichthys stellatus): Gene identification and gene expression profiling. FISH & SHELLFISH IMMUNOLOGY 2021; 118:155-159. [PMID: 34461259 DOI: 10.1016/j.fsi.2021.08.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 08/13/2021] [Accepted: 08/22/2021] [Indexed: 06/13/2023]
Abstract
Eosinophils are granular leukocytes that are evolutionarily preserved in the innate immune system of some invertebrates and vertebrates, and these cells can directly remove invading microorganisms and secrete various cytokines, and are also involved in homeostasis. These eosinophils are made up of specific granular proteins that can be differentiated from other cells, and eosinophil peroxidase (EPX) is a peroxidase released only from eosinophils that plays an important role in maintaining the main function and homeostasis of eosinophils. We obtained the sequence information of EPX for the first time from the starry flounder (Platichthys stellatus), and predicted it by amino acid sequencing to confirm sequence alignment and phylogenetic characteristics with other species. Based on analysis of the expression characteristics of PsEPX mRNA in healthy P. stellatus, it was expressed at the highest level in peripheral blood lymphocytes (PBLs) and was also expressed at a relatively high level in the head kidney and intestine, which are immune-related tissues. After artificial infection with Streptococcus parauberis and viral haemorrhagic septicaemia virus, which are the causes of major pathogenic diseases, the expression level of PsEPX was significantly regulated, which showed specific characteristics of pathogens or tissues. These results suggest that PsEPX is an important component of the immune system of P. stellatus and is considered a basic research case for the study of the immunological function of eosinophils in fish.
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Affiliation(s)
- Kwang-Min Choi
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea
| | - Min-Soo Joo
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea
| | - Gyoungsik Kang
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea
| | - Won-Sik Woo
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea
| | - Kyung Ho Kim
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea
| | - Son Ha Jeong
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea
| | - Min Young Son
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea
| | - Do-Hyung Kim
- Department of Aquatic Life Medicine, College of Fisheries Science, Pukyong National University, 45, Yongso-ro, Nam-Gu., Busan, Republic of Korea.
| | - Chan-Il Park
- Department of Marine Biology & Aquaculture, College of Marine Science, Gyeongsang National University, 455, Tongyeong, 650-160, Republic of Korea.
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Sánchez J, Sánchez A, Munera M, Garcia E, Lopez JF, Velásquez-Lopera M, Cardona R. Presence of IgE Autoantibodies Against Eosinophil Peroxidase and Eosinophil Cationic Protein in Severe Chronic Spontaneous Urticaria and Atopic Dermatitis. ALLERGY, ASTHMA & IMMUNOLOGY RESEARCH 2021; 13:746-761. [PMID: 34486259 PMCID: PMC8419645 DOI: 10.4168/aair.2021.13.5.746] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 12/17/2020] [Accepted: 12/17/2020] [Indexed: 11/20/2022]
Abstract
Purpose Eosinophils are frequently found in atopic dermatitis (AD) and chronic spontaneous urticaria (CSU) that release eosinophil peroxidase (EPX) and eosinophil cationic protein (ECP). Continuous exposure to these proteins could trigger an autoimmune response which may contribute to the pathogenesis and severity of skin inflammation. In this study, we investigate the immunoglobulin E (IgE) response against eosinophil proteins in CSU and AD. Methods We recruited patients with severe AD, severe CSU and healthy subjects to explore the presence of IgE autoantibodies and cross-reactivity against EPX, ECP and thyroid peroxidase (TPO). The potential cross-reactive epitopes among the peroxidase family were determined using in silico tools. Results The frequencies of anti-EPX IgE (28.8%) and anti-ECP IgE (26.6%) were higher in the AD group, and anti-TPO IgE was higher in the CSU group (27.2%). In the CSU group, there was a correlation between the anti-EPX IgE and anti-TPO IgE levels (r = 0.542, P < 0.001); TPO inhibited 42% of IgE binding to EPX, while EPX inhibited 59% of IgE binding to TPO, suggesting a cross-reactivity with EPX as a primary sensitizer. There was greater inhibition when we used a pool of sera CSU and AD, TPO inhibited 52% of IgE binding to EPX, while EPX inhibited 78% of IgE binding to TPO. In silico analysis showed a possible shared epitope in the peroxidase protein family. Conclusions IgE against eosinophil proteins may contribute to chronic inflammation in patients with AD and CSU. Cross-reactivity between EPX and TPO could explain thyroid problems in CSU patients.
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Affiliation(s)
- Jorge Sánchez
- Group of Clinical and Experimental Allergy, IPS Universitaria Clinic, University of Antioquia, Medellín, Colombia.
| | - Andres Sánchez
- Group of Clinical and Experimental Allergy, IPS Universitaria Clinic, University of Antioquia, Medellín, Colombia.,Medical Research Group (GINUMED), Rafael Núñez University Corporation, Department Immunology, Faculty of Medicine, Cartagena, Colombia
| | - Marlon Munera
- Medical Research Group (GINUMED), Rafael Núñez University Corporation, Department Immunology, Faculty of Medicine, Cartagena, Colombia
| | - Elizabeth Garcia
- Allergy Department, Faculty of Medicine, Universidad de los Andes, Bogotá, Colombia.,Department Allergology, Fundación Santa Fe de Bogotá, Bogotá, Colombia
| | - Juan-Felipe Lopez
- Group of Clinical and Experimental Allergy, IPS Universitaria Clinic, University of Antioquia, Medellín, Colombia.,Institute for Immunological Research, University of Cartagena, Cartagena, Colombia
| | - Margarita Velásquez-Lopera
- Dermatological Research Center, Centro de Investigaciones Dermatológicas (CIDERM), University of Antioquia, Medellín, Colombia
| | - Ricardo Cardona
- Group of Clinical and Experimental Allergy, IPS Universitaria Clinic, University of Antioquia, Medellín, Colombia
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Yu Y, Bovenhuis H, Wu Z, Laport K, Groenen MAM, Crooijmans RPMA. Deleterious Mutations in the TPO Gene Associated with Familial Thyroid Follicular Cell Carcinoma in Dutch German Longhaired Pointers. Genes (Basel) 2021; 12:997. [PMID: 34209805 PMCID: PMC8306087 DOI: 10.3390/genes12070997] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/22/2021] [Accepted: 06/25/2021] [Indexed: 12/26/2022] Open
Abstract
Familial thyroid cancer originating from follicular cells accounts for 5-15% of all the thyroid carcinoma cases in humans. Previously, we described thyroid follicular cell carcinomas in a large number of the Dutch German longhaired pointers (GLPs) with a likely autosomal recessive inheritance pattern. Here, we investigated the genetic causes of the disease using a combined approach of genome-wide association study and runs of homozygosity (ROH) analysis based on 170k SNP array genotype data and whole-genome sequences. A region 0-5 Mb on chromosome 17 was identified to be associated with the disease. Whole-genome sequencing revealed many mutations fitting the recessive inheritance pattern in this region including two deleterious mutations in the TPO gene, chr17:800788G>A (686F>V) and chr17:805276C>T (845T>M). These two SNP were subsequently genotyped in 186 GLPs (59 affected and 127 unaffected) and confirmed to be highly associated with the disease. The recessive genotypes had higher relative risks of 16.94 and 16.64 compared to homozygous genotypes for the reference alleles, respectively. This study provides novel insight into the genetic causes leading to the familial thyroid follicular cell carcinoma, and we were able to develop a genetic test to screen susceptible dogs.
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Affiliation(s)
| | | | | | | | | | - Richard P. M. A. Crooijmans
- Animal Breeding and Genomics, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands; (Y.Y.); (H.B.); (Z.W.); (K.L.); (M.A.M.G.)
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