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Sohn SY, Inoue K, Rhee CM, Leung AM. Risks of Iodine Excess. Endocr Rev 2024:bnae019. [PMID: 38870258 DOI: 10.1210/endrev/bnae019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 06/04/2024] [Accepted: 06/12/2024] [Indexed: 06/15/2024]
Abstract
Iodine is a micronutrient that is required for thyroid hormone synthesis. The iodide cycle in thyroid hormone synthesis consists of a series of transport, oxidation, organification, and binding/coupling steps in thyroid follicular cells. Common sources of iodine include the consumption of an iodine-rich diet or iodine fortified foods, the administration of amiodarone, iodine-containing supplements, or iodinated contrast media, and other miscellaneous sources. Methods to assess population iodine status include the measurement of urinary iodine concentrations, blood thyroglobulin levels, prevalence of elevated neonatal TSH levels, and thyroid volume. Although excessive iodine intake or exposure is generally well tolerated, an acute iodine load may result in thyroid dysfunction (hypothyroidism or hyperthyroidism) in certain susceptible individuals due to the failure to escape from the Wolff-Chaikoff effect and to the Jod-Basedow phenomenon, respectively. In this review, we discuss the associations between excessive iodine intake or exposure, with particular focus on iodinated contrast media as a common source of excess iodine in healthcare settings, and risks of incident thyroid dysfunction. We also summarize the risks of iodine excess in vulnerable populations and review current guidelines regarding the screening and monitoring of iodinated contrast-induced thyroid dysfunction. Finally, we discuss the long-term potential nonthyroidal health risks associated with iodine excess and suggest the need for more data to define safe upper limits for iodine intake, particularly in high-risk populations.
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Affiliation(s)
- Seo Young Sohn
- Division of Endocrinology, Department of Internal Medicine, Myongji Hospital, Hanyang University College of Medicine, Goyang, South Korea
| | - Kosuke Inoue
- Department of Social Epidemiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Hakubi Center, Kyoto University, Kyoto, Japan
| | - Connie M Rhee
- Division of Nephrology, Department of Medicine, Department of Medicine, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California, USA
- Division of Nephrology, Department of Medicine, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California, USA
| | - Angela M Leung
- Division of Endocrinology, Diabetes, and Metabolism; Department of Medicine, University of California Los Angeles David Geffen School of Medicine, Los Angeles, California, USA
- Division of Endocrinology, Diabetes, and Metabolism; Department of Medicine, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California, USA
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Moreno-Reyes R, Feldt-Rasmussen U, Piekiełko-Witkowska A, Gaspar da Rocha A, Badiu C, Köhrle J, Duntas L. The ETA-ESE statement on the European Chemicals Agency opinion on iodine as an endocrine disruptor. Eur Thyroid J 2024; 13:ETJ-23-0244. [PMID: 38320401 PMCID: PMC10959048 DOI: 10.1530/etj-23-0244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 02/05/2024] [Indexed: 02/08/2024] Open
Abstract
In 2022, the European Chemicals Agency (ECHA) made a statement concluding that iodine is an endocrine disruptor (ED). "We stress the fact that the ECHA opinion ECHA/BPC/357/2022 is based on their misguidedly zooming in on exclusively the biocidal products (e.g., hand disinfectants, disinfection of animals' teats/udder, embalming fluids before cremation, etc.) that contain molecular iodine (I2), entirely neglecting [see the 2013 ECHA Regulation (EU) n°528/2012 describing iodine as being of "great importance for human health". Clearly, the current sweeping and erroneous classification of "iodine" as an endocrine disruptor is ill-advised. We moreover call upon the scientific and medical community at large to use the accurate scientific nomenclature, i.e., iodide or iodate instead of "iodine" when referring to iodized salts and food prepared there with. Drugs, diagnostic agents, and synthetic chemicals containing the element iodine in the form of covalent bonds must be correctly labelled ''iodinated'', if possible, using each time their distinctive and accurate chemical or pharmacological name.
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Affiliation(s)
- Rodrigo Moreno-Reyes
- Department of Nuclear Medicine, Hospital Erasme, Université Libre de Bruxelles, Brussels, Belgium
| | - Ulla Feldt-Rasmussen
- Department of Endocrinology and Metabolism, University Hospital Rigshospitalet, and Faculty of Ηealth and Clinical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Agnieszka Piekiełko-Witkowska
- Centre of Postgraduate Medical Education, Centre of Translational Research, Department of Biochemistry and Molecular Biology, Warsaw, Poland: Basic Lead of the European Society of Endocrinology Focus Area on Thyroid
| | - Adriana Gaspar da Rocha
- Public Health Unit, ULS Baixo Mondego, Figueira da Foz, Portugal Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal Health Investigation and Innovation Institute (i3S), University of Porto, Porto, Portugal
| | - Corin Badiu
- National Institute of Endocrinology "C. Davila" University of Medicine and Pharmacy, Bucharest, Romania
| | - Josef Köhrle
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institut für Experimentelle Endokrinologie, Berlin, Germany: Co-Lead of the European Society of Endocrinology Focus Area on Environmental Endocrinology
| | - Leonidas Duntas
- Evgenideion Hospital, Unit of Endocrinology, Metabolism and Diabetes, National Kapodistrian University of Athens, Athens, Greece
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Zeng J, Li Q, Lu X, Liu DD, Jiao RG, Jiang YQ, Liu YB, Xu WQ, Ma J, Gu GL. Monitoring of urinary iodine concentration in naval pilots: should iodine be supplemented or limited at coastal stations? Mil Med Res 2024; 11:6. [PMID: 38247001 PMCID: PMC10802043 DOI: 10.1186/s40779-024-00511-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 01/09/2024] [Indexed: 01/23/2024] Open
Affiliation(s)
- Jia Zeng
- Department of Aeronautical Diseases, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China
| | - Qi Li
- No. 92853 Station Troops Hospital of Chinese PLA, Huludao, 125000, Liaoning, China
| | - Xiang Lu
- Department of Aeronautical Diseases, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China
| | - Dan-Dan Liu
- Department of Aeronautical Diseases, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China
| | - Rong-Guan Jiao
- Department of Intensive Care Unit, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China
| | - Yan-Qing Jiang
- Department of Aeronautical Diseases, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China
| | - Yan-Bing Liu
- Department of Aeronautical Diseases, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China
| | - Wan-Qing Xu
- Department III of Internal Medicine, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China
| | - Jun Ma
- Department of Aeronautical Diseases, Naval Medical Center, Naval Medical University of Chinese PLA, Shanghai, 200052, China.
| | - Guo-Li Gu
- Department of General Surgery, Air Force Medical Center, Air Force Medical University of Chinese PLA, Beijing, 100142, China.
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Zhang X, Tian L, Teng D, Teng W. The Relationship between Thyrotropin Serum Concentrations and Thyroid Carcinoma. Cancers (Basel) 2023; 15:5017. [PMID: 37894384 PMCID: PMC10605180 DOI: 10.3390/cancers15205017] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 10/10/2023] [Accepted: 10/14/2023] [Indexed: 10/29/2023] Open
Abstract
Thyroid Stimulating Hormone (TSH) is a hormone secreted by the pituitary gland and plays a role in regulating the production and secretion of thyroid hormones by the thyroid gland. This precise feedback loop is essential for maintaining a harmonious balance of thyroid hormones in the body, which are vital for numerous physiological processes. Consequently, TSH serves as a significant marker in assessing thyroid function, and deviations from normal TSH levels may indicate the presence of a thyroid disorder. Thyroid cancer (TC) is the malignant tumor within the endocrine system. In recent years, numerous experts have dedicated their efforts to discovering efficacious biomarkers for TC. These biomarkers aim to improve the accurate identification of tumors with a poor prognosis, as well as facilitate active monitoring of tumors with a more favorable prognosis. The role of TSH in the thyroid gland underscores its potential influence on the occurrence and progression of TC, which has garnered attention in the scientific community. However, due to the limited scope of clinical research and the dearth of high-quality foundational studies, the precise impact of TSH on TC remains unclear. Consequently, we present a comprehensive review of this subject, aiming to offer a valuable reference for future research endeavors.
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Affiliation(s)
| | | | - Di Teng
- Department of Endocrinology and Metabolism, Institute of Endocrine, NHC Key Laboratory of Diagnosis and Treatment of Thyroid Diseases, The First Hospital of China Medical University, Shenyang 110001, China; (X.Z.); (L.T.); (W.T.)
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Wang J, Gao Y, Zong Y, Gao W, Wang X, Sun J, Miao S. Nomogram Model Based on Iodine Nutrition and Clinical Characteristics of Papillary Thyroid Carcinoma to Predict Lateral Lymph Node Metastasis. Cancer Control 2023; 30:10732748231193248. [PMID: 37671703 PMCID: PMC10483970 DOI: 10.1177/10732748231193248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/07/2023] Open
Abstract
OBJECTIVE Preoperative evaluation of lateral lymph node metastasis (LLNM) in patients with papillary thyroid carcinoma (PTC) has been one of the major clinical challenges. This study aims to develop and validate iodine nutrition-related nomogram models to predict lateral cervical lymph node metastasis in patients with PTC. METHODS This is a retrospective study. Urinary iodine concentration (UIC) and serum iodine concentration (SIC) were measured in 187 LLNM patients and 289 non-LLNM (NLLNM) patients. All patients were randomized 3:1 into the training cohort (n = 355) and the validation cohort (n = 121). Using logistic regression analysis, we analyzed the influence of iodine nutrition-related factors and clinicopathological characteristics on LLNM in PTC patients. Lasso regression method was used to screen risk factors and construct a nomogram for predicting LLNM. The receiver operating characteristic curve (ROC curve), calibration curve, and decision curve analysis (DCA) of the nomogram models were carried out for the training and validation cohorts. RESULTS Gender, SIC, smoking history, drinking history, family history of PTC, multifocality, bilateral or unilateral tumors, TSH, Tg, and tumor size were included in the nomogram model predicting LLNM, with an area under the curve (AUC) of .795. The nomogram model showed good calibration and clinical benefit in both the training and validation cohorts. CONCLUSION The nomogram model based on iodine nutrition and other clinicopathological features is effective for predicting the lateral lymph node metastasis in PTC patients.
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Affiliation(s)
- Junrong Wang
- Department of Head and Neck Surgery, Harbin Medical University Cancer Hospital, Harbin, China
| | - Yuzhang Gao
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, People’s Republic of China
- Otolaryngology Major Disease Research Key Laboratory of Hunan Province, Changsha, People’s Republic of China
| | - Yuxuan Zong
- Department of Breast Surgery, The First of hospital of Qiqihar, Qiqihar, China
| | - Weitong Gao
- Department of Oncology, Harbin Medical University Cancer Hospital, Harbin, China
| | - Xueying Wang
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, People’s Republic of China
- Otolaryngology Major Disease Research Key Laboratory of Hunan Province, Changsha, People’s Republic of China
| | - Ji Sun
- Department of Head and Neck Surgery, Harbin Medical University Cancer Hospital, Harbin, China
| | - Susheng Miao
- Department of Head and Neck Surgery, Harbin Medical University Cancer Hospital, Harbin, China
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