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Search for other papers by Zhongli Chen in
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DZHK (German Center for Cardiovascular Research), Partner Site Greifswald, Greifswald, Germany
Department of Psychiatry and Psychotherapy, University Medicine Greifswald, Greifswald, Germany
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Institute of Clinical Chemistry and Laboratory Medicine, University Medicine Greifswald, Germany
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Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
Department of Internal Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
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Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands
Department of Internal Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
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Search for other papers by W Edward Visser in
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Search for other papers by Marcel E Meima in
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Objective
Thyroid hormone (TH) transport represents a critical first step in governing intracellular TH regulation. It is still unknown whether the full repertoire of TH transporters has been identified. Members of the solute carrier (SLC) 22 family have substrates in common with the known TH transporters of the organic anion-transporting peptide family. Therefore, we screened the SLC22 family for TH transporters
Methods
Uptake of 1 nM of iodothyronines or sulfated iodothyronines in COS1 cells expressing SLC22 proteins was performed.
Results
We first tested 25 mouse (m) SLC22 proteins for TH uptake and found that the majority of the organic anion transporter (OAT) clade were capable of 3,3’,5-triiodothyronine and/or thyroxine (T4) transport. Based on phylogenetic tree analysis of the mouse and human (h) SLC22 family, we selected eight hSLC22s that grouped with the newly identified mouse TH transporters. Of these, four tested positive for uptake of one or more substrates, particularly hSLC22A11 showed robust (3-fold over control) uptake of T4. Uptake of sulfated iodothyronines was strongly (up to 17-fold) induced by some SLC22s, most notably SLC22A8, hSLC22A9, mSLC22A27 and mSLC22A29. Finally, the zebrafish orthologues of SLC22A6/8 drOatx and drSlc22a6l also transported almost all (sulfated) iodothyronines tested. The OAT inhibitors lesinurad and probenecid inhibited most SLC22 proteins.
Conclusions
Our results demonstrated that members of the OAT clade of the SLC22 family constitute a novel, evolutionary conserved group of transporters for (sulfated) iodothyronines. Future studies should reveal the relevance of these transporters in TH homeostasis and physiology.
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Progress in the management of thyroid eye disease (TED) has been slow for many decades. The recent introduction of teprotumumab (TEP) in the therapeutic arena for TED has had a major impact in view of its efficacy, particularly with respect to its ability to reduce proptosis. However, the high cost of TEP, limited availability to patients outside the USA, and the lack of data on cost-effectiveness are significant barriers to improving the care of patients with TED globally. Recent guidance from authoritative professional organisations deliver different perspectives on the role of TEP in the routine management of patients with TED, underscoring the complexities of interpreting the evidence. The advance that TEP undoubtedly represents in managing TED effectively has highlighted inequities faced by patients and uncertainties about appropriate metrics of efficacy. Professional organisations have an important role addressing these problems. Future studies need to focus on optimising the measurement of outcomes and on assessing cost-effectiveness.
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Purpose
To determine whether thyroid-stimulating hormone level ≥ 30 mU/L is necessary for radioiodine (131I) remnant ablation (RRA) in patients with differentiated thyroid cancer (DTC), as well as its influencing factors and predictors.
Methods
A total of 487 DTC patients were retrospectively enrolled in this study. They were divided into two groups (TSH < 30 and ≥ 30 mU/L) and further divided into eight subgroups (0–<30, 30–<40, 40–<50, 50–<60, 60–<70, 70–<80, 80–<90, and 90–<100 mU/L). The simultaneous serum lipid level, successful rate of RRA and its influencing factors in different groups were analyzed. The receiver operating characteristic curves derived from pre-ablative thyroglobulin (pre-Tg) and pre-Tg/TSH ratio were compared for RRA success prediction performance.
Results
There was no statistical difference in success rates of RRA between the two groups (P = 0.247) and eight subgroups (P = 0.685). Levels of total cholesterol (P < 0.001), triglyceride (P = 0.006), high-density lipoprotein cholesterol (P = 0.024), low-density lipoprotein cholesterol (P = 0.001), apolipoprotein B (P < 0.001), and apolipoprotein E (P = 0.002) were significantly higher while apoA/apoB ratio (P = 0.024) was significantly lower at TSH ≥ 30 mU/L group. Pre-Tg level, gender, and N stage were influencing factors for RRA. The area under the curve of pre-Tg level and pre-Tg/TSH ratio was 0.7611 (P < 0.0001) and 0.7340 (P < 0.0001) for all enrolled patients and 0.7310 (P = 0.0145) and 0.6524 (P = 0.1068) for TSH < 30 mU/L, respectively.
Conclusion
TSH ≥ 30 mU/L may not be necessary for the success of RRA. Patients with higher serum TSH levels prior to RRA will suffer from severer hyperlipidemia. Pre-Tg level could be used as a predictor for the success of RRA, especially when TSH < 30 mU/L.
Search for other papers by Irene Campi in
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Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
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The clinical consequences of primary hypothyroidism include cardiovascular morbidity, increased mortality, and poor quality of life; therefore guidelines endorsed by several Scientific Societies recommend measuring circulating thyroid-stimulating hormone (TSH) in patients at risk. The assessment of serum TSH levels is also deemed to be the most robust and accurate biomarker during the management of replacement therapy in patients with a previous diagnosis of primary hypothyroidism. In line with a reflex TSH laboratory strategy, free thyroxine is measured only if the TSH falls outside specific cutoffs, in order to streamline investigations and save unjustified costs. This serum TSH-based approach to both diagnosis and monitoring has been widely accepted by several national and local health services; nevertheless, false-negative or -positive testing may occur, leading to inappropriate management or treatment. This review aims to describe several infrequent causes of increased circulating TSH, including analytical interferences, resistance to TSH, consumptive hypothyroidism, and refractoriness to levothyroxine replacement treatment. We propose a clinical flowchart to aid correct recognition of these various conditions, which represent important potential pitfalls in the diagnosis and treatment of primary hypothyroidism.
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Objective
The aim of this multicentre study was to investigate the progression of patient-reported outcomes after thyroid surgery, with emphasis on voice and swallowing difficulties.
Methods
An online platform was used to collect replies to standardised questionnaires (voice handicap index, VHI; voice-related quality of life, VrQoL; EAT-10) preoperatively and at 2–6 weeks and 3–6–12 months after surgery.
Results
A total of 236 patients were recruited from five centres that contributed with median of 11 cases (range 2–186 cases). Average symptoms scores showed voice changes lasting up to 3 months: VHI increased from 41 ± 15 (preop) to 48 ± 21 (6 weeks) and returned to 41 ± 15 at 6 months. Similarly, VrQoL increased from 12 ± 4 to 15 ± 6 and returned to 12 ± 4 (6 months). Severe voice changes (VHI > 60) were reported in 12% of patients preop, 22% at 2 weeks, 18% at 6 weeks, 13% at 3 months and 7% at 12 months. Only five patients with normal preoperative voice had persistent severe voice changes after 6–12 months. Those with severe voice changes at 2 weeks (median VHI 70.5, IQR 65–81) had significant improvement by 6 months (median VHI 54, IQR 39–65) (P < 0.001).
Swallowing assessment showed a median preop score of 0 (IQR 0–3) increasing to a median of 2 (IQR 0–8) at 2 weeks and normal values afterwards.
Conclusion
The ThyVoice online platform allows the assessment of patient-reported outcome measures in thyroid surgery. Voice morbidity appears to be more frequent than commonly reported, and this risk should the quoted during informed consent. Swallowing difficulties are mild but significant in the first 2 weeks.
Search for other papers by Caiyan Mo in
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Search for other papers by Han Chen in
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Background
Central hyperthyroidism is characterized by elevated free thyroid hormone and unsuppressed thyroid-stimulating hormone (TSH), and this laboratory feature includes TSH-secreting pituitary adenoma (TSHoma) and resistance to thyroid hormone β (RTHβ). Central hyperthyroidism combined with Graves’ disease (GD) has been rarely reported.
Case Report
We describe three patients with TSHoma combined with GD and one patient with GD combined with RTHβ and pituitary adenoma. These three patients with TSHoma combined with GD showed elevated thyroid hormone, while TSH level was normal or elevated, and TSH receptor antibodies were positive. After thyrotoxicosis was controlled, they all underwent transsphenoidal surgery. We also describe a patient with an initial presentation of GD who developed hypothyroidism after anti-hyperthyroidism treatment and TSH was inappropriately significantly increased. His head magnetic resonance imaging revealed a pituitary adenoma. Genetic testing confirmed a heterozygous mutation in the thyroid hormone receptor β gene c.1148G>A (p.R383H). After levothyroxine and desiccated thyroid tablet treatment, the TSH level decreased to normal.
Conclusion
These four cases highlight the need to consider the diagnosis of GD combined with central hyperthyroidism when faced with inconsistent thyroid function test results, illuminating the specific diagnostic and therapeutic challenges of coexisting primary and central hyperthyroidism. Finally, we propose clinical management for central hyperthyroidism combined with GD.
Department of Medical Radiation Physics and Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden
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Department of Oncology-Pathology, Karolinska Institutet, Stockholm, Sweden
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Department of Pathology and Cancer Diagnostics, Karolinska University Hospital, Stockholm, Sweden
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Stockholms Sjukhem Foundation's Research and Development Department, Stockholm, Sweden
Department of Clinical Sciences Lund, Lund University, Lund, Sweden
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Department of Breast, Endocrine Tumours and Sarcoma, Karolinska University Hospital, Stockholm, Sweden
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Department of Pathology and Cancer Diagnostics, Karolinska University Hospital, Stockholm, Sweden
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Background
Successful radioiodine treatment of differentiated thyroid cancer requires iodine avidity: that is, the concentration and retention of iodine in cancer tissue. Several parameters have previously been linked with lower iodine avidity. However, a comprehensive analysis of which factors best predict iodine avidity status, and the magnitude of their impact, is lacking.
Methods
Quantitative measurements of iodine avidity in surgical specimens (primary tumour and lymph node metastases) of 28 patients were compared to immunohistochemical expression of the thyroid-stimulating hormone receptor, thyroid peroxidase (TPO), pendrin, sodium–iodide symporter (NIS) and mutational status of BRAF and the TERT promoter. Regression analysis was used to identify independent predictors of poor iodine avidity.
Results
Mutations in BRAF and the TERT promoter were significantly associated with lower iodine avidity for lymph node metastases (18-fold and 10-fold, respectively). Membranous NIS localisation was found only in two cases but was significantly associated with high iodine avidity. TPO expression was significantly correlated with iodine avidity (r = 0.44). The multivariable modelling showed that tumour tissue localisation (primary tumour or lymph node metastasis), histological subtype, TPO and NIS expression and TERT promoter mutation were each independent predictors of iodine avidity that could explain 68% of the observed variation of iodine avidity.
Conclusions
A model based on histological subtype, TPO and NIS expression and TERT promoter mutation, all evaluated on initial surgical material, can predict iodine avidity in thyroid cancer tissue ahead of treatment. This could inform early adaptation with respect to expected treatment effect.
Search for other papers by Hicham Benabdelkamel in
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Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
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Department of Medicine, College of Medicine and King Saud Medical City, King Saud University, Riyadh, Saudi Arabia
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Department of Biochemistry and Molecular Medicine, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
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Background
Hypothyroidism is clinically characterized by a decrease in levels of the circulating thyroid hormones namely thyroxine and triiodothyronine. The main treatment for hypothyroidism is thyroid hormone replacement using levothyroxine to normalize serum thyroid hormone levels.
Objectives
In this study, we explored the metabolic changes in the plasma of patients with hypothyroidism after reaching a euthyroid state with levothyroxine treatment.
Methods
Plasma samples from 18 patients diagnosed as overt hypothyroidism were collected before and after levothyroxine treatment upon reaching a euthyroid state and were analyzed by high-resolution mass spectrometry-based metabolomics. Multivariate and univariate analyses evaluated data to highlight potential metabolic biomarkers.
Results
Liquid chromatography-mass spectrometry-based metabolomics revealed a significant decrease in the levels of ceramide, phosphatidylcholine, triglycerides, acylcarnitine, and peptides after levothyroxine treatment; this could indicate a change in the fatty acid transportation system and an enhanced β-oxidation, compared with a hypothyroid state. At the same time, the decrease in the peptides suggested a shift in protein synthesis. In addition, there was a considerable rise in glycocholic acid following therapy, suggesting the involvement of thyroid hormones in stimulating bile acid production and secretion.
Conclusions
A metabolomic analysis of patients with hypothyroidism revealed significant changes in several metabolites and lipids after treatment. This study showed the value of the metabolomics technique in providing a complementary understanding of the pathophysiology of hypothyroidism and as a crucial tool for examining the molecular impact of levothyroxine treatment on hypothyroidism. It was an important tool for investigating the therapeutic effects of levothyroxine on hypothyroidism at the molecular level.
Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, The Netherlands
Amsterdam Reproduction & Development Research Institute, Amsterdam, The Netherlands
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Department of Pediatric Endocrinology, Emma Children’s Hospital, Amsterdam UMC, location University of Amsterdam, Amsterdam, The Netherlands
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Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam, The Netherlands
Amsterdam Reproduction & Development Research Institute, Amsterdam, The Netherlands
Endocrine Laboratory, Department of Laboratory Medicine, Amsterdam UMC, location Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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Department of Pediatric Endocrinology, Emma Children’s Hospital, Amsterdam UMC, location University of Amsterdam, Amsterdam, The Netherlands
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Thyroid hormone (TH) is indispensable for brain development in utero and during the first 2–3 years of life, and the negative effects of TH deficiency on brain development are irreversible. Detection of TH deficiency early in life by neonatal screening allows early treatment, thereby preventing brain damage.
Inborn shortage of TH, also named congenital hypothyroidism (CH), can be the result of defective thyroid gland development or TH synthesis (primary or thyroidal CH (CH-T)). Primary CH is characterized by low blood TH and elevated thyroid-stimulating hormone (TSH) concentrations. Less frequently, CH is due to insufficient stimulation of the thyroid gland because of disturbed hypothalamic or pituitary function (central CH). Central CH is characterized by low TH concentrations, while TSH is normal, low or slightly elevated.
Most newborn screening (NBS) programs for CH are primarily TSH based and thereby do not detect central CH. Only a few NBS programs worldwide aim to detect both forms of CH by different strategies. In the Netherlands, we have a unique T4–TSH–thyroxine-binding globulin (TBG) NBS algorithm for CH, which enables the detection of primary and central CH.
Although the necessity of central CH detection by NBS is still under debate, it has been shown that most central CH patients have moderate-to-severe hypothyroidism instead of mild and that early detection of central CH by NBS probably improves its clinical outcome and clinical care for central CH patients with multiple pituitary hormone deficiency. We are therefore convinced that detection of central CH by NBS is of utmost importance.
Department of Neurology, Sahlgrenska University Hospital, Gothenburg, Sweden
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Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
Wallenberg’s Centre of Molecular and Translational Medicine, Region Västra Götaland, Sweden
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Department of Pedagogical, Curricular and Professional Studies, Faculty of Education, University of Gothenburg, Gothenburg, Sweden
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Wallenberg’s Centre of Molecular and Translational Medicine, Region Västra Götaland, Sweden
Department of Endocrinology, Sahlgrenska University Hospital, Gothenburg, Sweden
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Objective
Mental fatigue, depression, anxiety, and cognitive complaints are common in Graves’ disease (GD). Our aims were to assess the relationship between these variables in patients with GD during both hyperthyroidism and a long stable euthyroidism.
Methods
A prospective longitudinal case-control study where 65 premenopausal women diagnosed with GD and 65 matched controls were assessed twice with 15 months in between. The first visit for patients was in overt hyperthyroidism and the second after treatment.
Results
During the hyperthyroid phase, mental fatigue, depression, and anxiety were significantly increased for GD patients compared to controls (all P < 0.001). Among GD patients, 89% reported mental fatigue and among controls 14%. No difference in cognitive tests was found. After 15 months, significant improvements for GD patients after treatment were found for the items of mental fatigue, depression, and anxiety (all P < 0.001), but these were unchanged in controls. GD patients reported residual mental fatigue (38%), 23% without depression, and 15% mental fatigue combined with depression. Self-reported cognitive complaints were pronounced while cognitive tests did not reveal any deficiencies.
Conclusion
Mental fatigue and emotional distress are common in the hyperthyroid phase. These improve with treatment but are still more common in GD patients after 15 months of therapy than in controls. The residual mental fatigue is shown to be a phenomenon distinct from depression in this study. This indicates the importance of assessing mental fatigue in GD patients and underlines the need for rehabilitation and healthcare support as fatigue will have consequences for work ability.
