Endocrinology and Metabolism

Diabetes, obesity and metabolism
Performance of Simple Fibrosis Score in Non-Alcoholic Fatty Liver Disease with and without Type 2 Diabetes: Seung Min Chung, Min Kyu Kang, Jun Sung Moon, Jung Gil Park; Endocrinol Metab. 2023;38(2):277-281. Published online March 13, 2023; DOI: https://doi.org/10.3803/EnM.2022.1635

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This cross-sectional study enrolled 267 patients with metabolic risk factors and established non-alcoholic fatty liver disease in the prospective cohort. The performance of fibrosis-4 (FIB-4) score (≥1.3) to diagnose advanced fibrosis using transient elastography (liver stiffness measurement [LSM] ≥8 kPa) was analyzed. Comparing patients with type 2 diabetes (T2D, n=87) and without (n=180), not FIB-4, but LSM was significantly higher in T2D (P=0.026). The prevalence of advanced fibrosis was 17.2% in T2D and 12.8% in non-T2D. FIB-4 exhibited higher proportion of false negatives in T2D patients (10.9%) than those without (5.2%). The diagnostic performance of FIB-4 was suboptimal in T2D (area under curve [AUC], 0.653; 95% confidence interval [CI], 0.462 to 0.844) compared to that in non-T2D (AUC, 0.826; 95% CI, 0.724 to 0.927). In conclusion, patients with T2D might be beneficial to conduct transient elastography without screening to avoid missing advanced fibrosis.

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Prevalence of High and Moderate Risk of Liver Fibrosis Among Patients With Diabetes at a Noncommunicable Diseases (NCD) Clinic in a Primary Healthcare Center in Northern India
Anubhav Mondal, Aninda Debnath, Ghurumourthy Dhandapani, Abhishek Sharma, Shveta Lukhmana, Geeta Yadav
Cureus.2023;[Epub] CrossRef

Thyroid Thyroid Cancer Screening
Thyroid Cancer Screening: How to Maximize Its Benefits and Minimize Its Harms: Jung Hwan Baek; Endocrinol Metab. 2023;38(1):75-77. Published online February 27, 2023; DOI: https://doi.org/10.3803/EnM.2023.105

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Multidimensional Prediction Method for Thyroid Cancer Based on Spatiotemporally Imbalanced Distribution Data
Zhiwei Jia, Yuqi Huang, Yanhui Lin, Min Fu, Chenhao Sun
IEEE Access.2024; 12: 4674. CrossRef

Diabetes, Obesity and Metabolism
Incretin and Pancreatic β-Cell Function in Patients with Type 2 Diabetes: Chang Ho Ahn, Tae Jung Oh, Se Hee Min, Young Min Cho; Endocrinol Metab. 2023;38(1):1-9. Published online February 13, 2023; DOI: https://doi.org/10.3803/EnM.2023.103

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To maintain normal glucose homeostasis after a meal, it is essential to secrete an adequate amount of insulin from pancreatic β-cells. However, if pancreatic β-cells solely depended on the blood glucose level for insulin secretion, a surge in blood glucose levels would be inevitable after the ingestion of a large amount of carbohydrates. To avoid a deluge of glucose in the bloodstream after a large carbohydrate- rich meal, enteroendocrine cells detect the amount of nutrient absorption from the gut lumen and secrete incretin hormones at scale. Since insulin secretion in response to incretin hormones occurs only in a hyperglycemic milieu, pancreatic β-cells can secrete a “Goldilocks” amount of insulin (i.e., not too much and not too little) to keep the blood glucose level in the normal range. In this regard, pancreatic β-cell sensitivity to glucose and incretin hormones is crucial for maintaining normal glucose homeostasis. In this Namgok lecture 2022, we review the effects of current anti-diabetic medications on pancreatic β-cell sensitivity to glucose and incretin hormones.

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Initial Combination Therapy in Type 2 Diabetes
Ji Yoon Kim, Nam Hoon Kim
Endocrinology and Metabolism.2024; 39(1): 23. CrossRef

Calcium & bone metabolism
MicroRNA-181a-5p Curbs Osteogenic Differentiation and Bone Formation Partially Through Impairing Runx1-Dependent Inhibition of AIF-1 Transcription: Jingwei Liu, Xueying Chang, Daming Dong; Endocrinol Metab. 2023;38(1):156-173. Published online January 6, 2023; DOI: https://doi.org/10.3803/EnM.2022.1516

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Background
Evidence has revealed the involvement of microRNAs (miRNAs) in modulating osteogenic differentiation, implying the promise of miRNA-based therapies for treating osteoporosis. This study investigated whether miR-181a-5p influences osteogenic differentiation and bone formation and aimed to establish the mechanisms in depth.
Methods
Clinical serum samples were obtained from osteoporosis patients, and MC3T3-E1 cells were treated with osteogenic induction medium (OIM) to induce osteogenic differentiation. miR-181a-5p-, Runt-related transcription factor 1 (Runx1)-, and/or allograft inflammatory factor-1 (AIF-1)-associated oligonucleotides or vectors were transfected into MC3T3-E1 cells to explore their function in relation to the number of calcified nodules, alkaline phosphatase (ALP) staining and activity, expression levels of osteogenesis-related proteins, and apoptosis. Luciferase activity, RNA immunoprecipitation, and chromatin immunoprecipitation assays were employed to validate the binding relationship between miR-181a-5p and Runx1, and the transcriptional regulatory relationship between Runx1 and AIF-1. Ovariectomy (OVX)-induced mice were injected with a miR-181a-5p antagonist for in vivo verification.
Results
miR-181a-5p was highly expressed in the serum of osteoporosis patients. OIM treatment decreased miR-181a-5p and AIF-1 expression, but promoted Runx1 expression in MC3T-E1 cells. Meanwhile, upregulated miR-181a-5p suppressed OIM-induced increases in calcified nodules, ALP content, and osteogenesis-related protein expression. Mechanically, miR-181a-5p targeted Runx1, which acted as a transcription factor to negatively modulate AIF-1 expression. Downregulated Runx1 suppressed the miR-181a-5p inhibitor-mediated promotion of osteogenic differentiation, and downregulated AIF-1 reversed the miR-181a-5p mimic-induced inhibition of osteogenic differentiation. Tail vein injection of a miR-181a-5p antagonist induced bone formation in OVX-induced osteoporotic mice.
Conclusion
In conclusion, miR-181a-5p affects osteogenic differentiation and bone formation partially via the modulation of the Runx1/AIF-1 axis.

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Scopolamine regulates the osteogenic differentiation of human periodontal ligament stem cells through lactylation modification of RUNX2 protein
Ying Wu, Pan Gong
Pharmacology Research & Perspectives.2024;[Epub] CrossRef

Thyroid
Metabolite Changes during the Transition from Hyperthyroidism to Euthyroidism in Patients with Graves’ Disease: Ho Yeop Lee, Byeong Chang Sim, Ha Thi Nga, Ji Sun Moon, Jingwen Tian, Nguyen Thi Linh, Sang Hyeon Ju, Dong Wook Choi, Daiki Setoyama, Hyon-Seung Yi; Endocrinol Metab. 2022;37(6):891-900. Published online December 26, 2022; DOI: https://doi.org/10.3803/EnM.2022.1590

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Background
An excess of thyroid hormones in Graves’ disease (GD) has profound effects on systemic energy metabolism that are currently partially understood. In this study, we aimed to provide a comprehensive understanding of the metabolite changes that occur when patients with GD transition from hyperthyroidism to euthyroidism with methimazole treatment.
Methods
Eighteen patients (mean age, 38.6±14.7 years; 66.7% female) with newly diagnosed or relapsed GD attending the endocrinology outpatient clinics in a single institution were recruited between January 2019 and July 2020. All subjects were treated with methimazole to achieve euthyroidism. We explored metabolomics by performing liquid chromatography-mass spectrometry analysis of plasma samples of these patients and then performed multivariate statistical analysis of the metabolomics data.
Results
Two hundred metabolites were measured before and after 12 weeks of methimazole treatment in patients with GD. The levels of 61 metabolites, including palmitic acid (C16:0) and oleic acid (C18:1), were elevated in methimazole-naïve patients with GD, and these levels were decreased by methimazole treatment. The levels of another 15 metabolites, including glycine and creatinine, were increased after recovery of euthyroidism upon methimazole treatment in patients with GD. Pathway analysis of metabolomics data showed that hyperthyroidism was closely related to aminoacyl-transfer ribonucleic acid biosynthesis and branched-chain amino acid biosynthesis pathways.
Conclusion
In this study, significant variations of plasma metabolomic patterns that occur during the transition from hyperthyroidism to euthyroidism were detected in patients with GD via untargeted metabolomics analysis.

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Associations of serum keratin 1 with thyroid function and immunity in Graves’ disease
Chao-Wen Cheng, Wen-Fang Fang, Jiunn-Diann Lin, Appuwawadu Mestri Nipun Lakshitha de Silva
PLOS ONE.2023; 18(11): e0289345. CrossRef

Thyroid
Identification of Mutations in the Thyroxine-Binding Globulin (TBG) Gene in Patients with TBG Deficiency in Korea: Jung Heo, Sang-Mi Kim, Hyun Jin Ryu, Hyunju Park, Tae Hyuk Kim, Jae Hoon Chung, Hyung-Doo Park, Sun Wook Kim; Endocrinol Metab. 2022;37(6):870-878. Published online December 7, 2022; DOI: https://doi.org/10.3803/EnM.2022.1591

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Background
Thyroxine-binding globulin (TBG) is a major transporter protein for thyroid hormones. The serpin family A member 7 (SERPINA7) gene codes for TBG, and mutations of the SERPINA7 gene result in TBG deficiency. Although more than 40 mutations have been reported in several countries, only a few studies of TBG deficiency and SERPINA7 gene mutation have been performed in Korea. The aim of this study is to review the clinical presentations and laboratory findings of patients with TBG deficiency and to investigate the types of SERPINA7 gene mutation.
Methods
Five unrelated Korean adults with TBG deficiency attending endocrinology clinic underwent SERPINA7 gene sequencing. Four patients harbored a SERPINA7 gene mutation. Serum thyroid hormones, anti-microsomal antibodies, and TBG were measured. Genomic DNA was extracted from whole blood. All exons and intron-exon boundaries of the TBG gene were amplified and sequencing was performed.
Results
Two patients were heterozygous females, and the other two were hemizygous males. One heterozygous female had coexisting hypothyroidism. The other heterozygous female was erroneously prescribed levothyroxine at a local clinic. One hemizygous male harbored a novel mutation, p.Phe269Cysfs*18, which caused TBG partial deficiency. Three patients had the p.Leu372Phefs*23 mutation, which is known as TBG-complete deficiency Japan (TBG-CDJ) and was also presented in previous mutation analyses in Korea.
Conclusion
This study presents four patients diagnosed with TBG deficiency and provides the results of SERPINA7 gene sequencing. One novel mutation, p.Phe269Cysfs*18, causing TBD-partial deficiency and three cases of TBG-CDJ were demonstrated. It is necessary to identify TBG deficiency to prevent improper treatment. Also, sequencing of the SERPINA7 gene would provide valuable information about the TBG variants in Korea.

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Development and basic performance verification of a rapid homogeneous bioassay for agonistic antibodies against the thyroid-stimulating hormone receptor
Motoki Hoshina, Shiomi Ojima, Atsushi Kawasaki, Kosuke Doi, Satoshi Ohta, Asuka Inoue, Hiroshi Murayama
Journal of Immunological Methods.2024; 528: 113655. CrossRef

Adrenal Gland
Aldosterone Immunoassay-Specific Cutoff Value for Seated Saline Suppression Test for Diagnosing Primary Aldosteronism: So Yoon Kwon, Jiyun Park, So Hee Park, So Hyun Cho, You-Bin Lee, Soo-Youn Lee, Jae Hyeon Kim; Endocrinol Metab. 2022;37(6):938-942. Published online December 6, 2022; DOI: https://doi.org/10.3803/EnM.2022.1535

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A seated saline loading test (SLT) using liquid chromatography-tandem mass spectrometry (LC-MS/MS) is one of the most accepted confirmatory tests of primary aldosteronism. However, LC-MS/MS is time-consuming and is not widely available in diagnostic laboratories compared to immunoassay. With immunoassay, it is unknown whether SLT in the seated position is more accurate than that of the supine position, and a cutoff value of post-seated SLT plasma aldosterone concentration (PAC) must be established in the Korean population. Ninety-eight patients underwent SLT in both positions, and post-SLT PAC was measured by LC-MS/MS and radioimmunoassay. We confirmed primary aldosteronism if post-seated SLT PAC by LC-MS/MS exceeded 5.8 ng/dL. The area under the receiver operating characteristic curve was greater for seated than supine SLT (0.928 vs. 0.834, P=0.003). The optimal cutoff value of post-seated SLT by radioimmunoassay was 6.6 ng/dL (sensitivity 83.3%, specificity 92.2%).

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Investigating the cut-off values of captopril challenge test for primary aldosteronism using the novel chemiluminescent enzyme immunoassay method: a retrospective cohort study
Yuta Tezuka, Kei Omata, Yoshikiyo Ono, Kengo Kambara, Hiroki Kamada, Sota Oguro, Yuto Yamazaki, Celso E. Gomez-Sanchez, Akihiro Ito, Hironobu Sasano, Kei Takase, Tetsuhiro Tanaka, Hideki Katagiri, Fumitoshi Satoh
Hypertension Research.2024;[Epub] CrossRef

Thyroid
Efficacy and Safety of Long-Term Methimazole versus Radioactive Iodine in the Treatment of Toxic Multinodular Goiter: Fereidoun Azizi, Navid Saadat, Mir Alireza Takyar, Hengameh Abdi, Ladan Mehran, Atieh Amouzegar; Endocrinol Metab. 2022;37(6):861-869. Published online November 23, 2022; DOI: https://doi.org/10.3803/EnM.2022.1476

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Background
This study compared the degree of sustained control of hyperthyroidism in patients with toxic multinodular goiter (TMNG) treated with long-term methimazole (LT-MMI) or radioactive iodine (RAI).
Methods
In this clinical trial, 130 untreated patients with TMNG were randomized to either LT-MMI or RAI treatment. Both groups were followed for 108 to 148 months, with median follow-up durations of 120 and 132 months in the LT-MMI and RAI groups, respectively. Both groups of patients were followed every 1 to 3 months in the first year and every 6 months thereafter.
Results
After excluding patients in whom the treatment modality was changed and those who were lost to follow-up, 53 patients in the LT-MMI group and 54 in the RAI group completed the study. At the end of the study period, 50 (96%) and 25 (46%) patients were euthyroid, and two (4%) and 25 (46%) were hypothyroid in LT-MMI and RAI groups, respectively. In the RAI group, four (8%) patients had subclinical hyperthyroidism. The mean time to euthyroidism was 4.3±1.3 months in LT-MMI patients and 16.3± 15.0 months in RAI recipients (P<0.001). Patients treated with LT-MMI spent 95.8%±5.9% of the 12-year study period in a euthyroid state, whereas this proportion was 72.4%±14.8% in the RAI-treated patients (P<0.001). No major treatment-related adverse events were observed in either group.
Conclusion
In patients with TMNG, LT-MMI therapy is superior to RAI treatment, as shown by the earlier achievement of euthyroidism and the longer duration of sustained normal serum thyrotropin.

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Mechanism of Huatan Sanjie Fang in improving goiter in Graves' disease mice based on the Hippo signaling pathway
Huimin Yuan, Wenxin Ma, Yifei Song, Hang Wang, Shuxin Yan, Silan Hao, Xiaoyun Zhu, Yang Tang
Journal of Traditional Chinese Medical Sciences.2023; 10(3): 289. CrossRef

Thyroid
Frequency of TERT Promoter Mutations in Real-World Analysis of 2,092 Thyroid Carcinoma Patients (Endocrinol Metab 2022;37:652-63, Heera Yang et al.): Sue Youn Kim, Chan Kwon Jung; Endocrinol Metab. 2022;37(6):947-948. Published online November 10, 2022; DOI: https://doi.org/10.3803/EnM.2022.1596

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2023 Korean Thyroid Association Management Guidelines for Patients with Thyroid Nodules
Young Joo Park, Eun Kyung Lee, Young Shin Song, Soo Hwan Kang, Bon Seok Koo, Sun Wook Kim, Dong Gyu Na, Seung-Kuk Baek, So Won Oh, Min Kyoung Lee, Sang-Woo Lee, Young Ah Lee, Yong Sang Lee, Ji Ye Lee, Dong-Jun Lim, Leehi Joo, Yuh-Seog Jung, Chan Kwon Jung
International Journal of Thyroidology.2023; 16(1): 1. CrossRef

Diabetes, Obesity and Metabolism Big Data Articles (National Health Insurance Service Database)
Association between the Diabetes Drug Cost and Cardiovascular Events and Death in Korea: A National Health Insurance Service Database Analysis: Seung Min Chung, Ji-In Lee, Eugene Han, Hyun-Ae Seo, Eonju Jeon, Hye Soon Kim, Ji Sung Yoon; Endocrinol Metab. 2022;37(5):759-769. Published online October 5, 2022; DOI: https://doi.org/10.3803/EnM.2022.1515

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Background
This study aimed to investigate the long-term effects of diabetes drug costs on cardiovascular (CV) events and death.
Methods
This retrospective observational study used data from 2009 to 2018 from the National Health Insurance in Korea. Among the patients with type 2 diabetes, those taking antidiabetic drugs and who did not have CV events until 2009 were included. Patients were divided into quartiles (Q1 [lowest]–4 [highest]) according to the 2009 diabetes drug cost. In addition, the 10-year incidences of CV events (non-fatal myocardial infarction, stroke, hospitalization for heart failure, and coronary revascularization) and CV death (death due to CV events) were analyzed.
Results
A total of 441,914 participants were enrolled (median age, 60 years; men, 57%). CV events and death occurred in 28.1% and 8.36% of the patients, respectively. The 10-year incidences of CV events and deaths increased from Q1 to 4. After adjusting for sex, age, income, type of diabetes drugs, comorbidities, and smoking and drinking status, the risk of CV events significantly increased according to the sequential order of the cost quartiles. In contrast, the risk of CV death showed a U-shaped pattern, which was the lowest in Q3 (hazard ratio [HR], 0.953; 95% confidence interval [CI], 0.913 to 0.995) and the highest in Q4 (HR, 1.266; 95% CI, 1.213 to 1.321).
Conclusion
Diabetes drug expenditure affects 10-year CV events and mortality. Therefore, affording an appropriate diabetes drug cost at a similar risk of CV is an independent protective factor against CV death.

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Impact of mental disorders on the risk of heart failure among Korean patients with diabetes: a cohort study
Tae Kyung Yoo, Kyung-Do Han, Eun-Jung Rhee, Won-Young Lee
Cardiovascular Diabetology.2023;[Epub] CrossRef

Adrenal Gland
A Novel Missense PRKAR1A Variant Causes Carney Complex: Boram Kim, Han Na Jang, Kyung Shil Chae, Ho Seop Shin, Yong Hwy Kim, Su Jin Kim, Moon-Woo Seong, Jung Hee Kim; Endocrinol Metab. 2022;37(5):810-815. Published online October 4, 2022; DOI: https://doi.org/10.3803/EnM.2022.1544

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The Carney complex (CNC) is an autosomal dominant disorder characterized by endocrine and nonendocrine tumors. Loss-of-function variants of protein kinase A regulatory subunit 1 alpha (PRKAR1A) are common causes of CNC. Here, we present the case of a patient with CNC with a novel PRKAR1A missense variant. A 21-year-old woman was diagnosed with CNC secondary to acromegaly and adrenal Cushing syndrome. Genetic analysis revealed a novel missense heterozygous variant of PRKAR1A (c.176A>T). Her relatives, suspected of having CNC, also carried the same variant. RNA analysis revealed that this variant led to nonsense-mediated mRNA decay. In vitro functional analysis of the variant confirmed its role in increasing protein kinase A activity and cyclic adenosine monophosphate levels. This study broadens our understanding of the genetic spectrum of CNC. We suggest that PRKAR1A genetic testing and counseling be recommended for patients with CNC and their families.

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Carney complex: A clinicopathologic study on a single family from several Canadian provinces
Alexandra Lao, Julio Silva, Brian Chiu, Consolato M. Sergi
Cardiovascular Pathology.2024; 69: 107599. CrossRef

Miscellaneous
DN200434 Inhibits Vascular Smooth Muscle Cell Proliferation and Prevents Neointima Formation in Mice after Carotid Artery Ligation: Sudeep Kumar, Jonghwa Jin, Hyeon Young Park, Mi-Jin Kim, Jungwook Chin, Sungwoo Lee, Jina Kim, Jung-Guk Kim, Yeon-Kyung Choi, Keun-Gyu Park; Endocrinol Metab. 2022;37(5):800-809. Published online September 28, 2022; DOI: https://doi.org/10.3803/EnM.2022.1462

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Background
Excessive proliferation and migration of vascular smooth muscle cells (VSMCs), which contributes to the development of occlusive vascular diseases, requires elevated mitochondrial oxidative phosphorylation to meet the increased requirements for energy and anabolic precursors. Therefore, therapeutic strategies based on blockade of mitochondrial oxidative phosphorylation are considered promising for treatment of occlusive vascular diseases. Here, we investigated whether DN200434, an orally available estrogen receptor-related gamma inverse agonist, inhibits proliferation and migration of VSMCs and neointima formation by suppressing mitochondrial oxidative phosphorylation.
Methods
VSMCs were isolated from the thoracic aortas of 4-week-old Sprague-Dawley rats. Oxidative phosphorylation and the cell cycle were analyzed in fetal bovine serum (FBS)- or platelet-derived growth factor (PDGF)-stimulated VSMCs using a Seahorse XF-24 analyzer and flow cytometry, respectively. A model of neointimal hyperplasia was generated by ligating the left common carotid artery in male C57BL/6J mice.
Results
DN200434 inhibited mitochondrial respiration and mammalian target of rapamycin complex 1 activity and consequently suppressed FBS- or PDGF-stimulated proliferation and migration of VSMCs and cell cycle progression. Furthermore, DN200434 reduced carotid artery ligation-induced neointima formation in mice.
Conclusion
Our data suggest that DN200434 is a therapeutic option to prevent the progression of atherosclerosis.

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Jatrorrhizine inhibits Piezo1 activation and reduces vascular inflammation in endothelial cells
Tianying Hong, Xianmei Pan, Han Xu, Zhijuan Zheng, Lizhen Wen, Jing Li, Mingfeng Xia
Biomedicine & Pharmacotherapy.2023; 163: 114755. CrossRef

Thyroid
Efficient Dissociation Protocol for Generation of Single Cell Suspension from Human Thyroid Tissue for Single Cell RNA Sequencing: Shinae Yi, Hyun Jung Kim, Bon Seok Koo, Seong Eun Lee, Jahyun Choi, Yea Eun Kang; Endocrinol Metab. 2022;37(4):698-700. Published online August 29, 2022; DOI: https://doi.org/10.3803/EnM.2022.1536

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Unraveling the role of the mitochondrial one-carbon pathway in undifferentiated thyroid cancer by multi-omics analyses
Seong Eun Lee, Seongyeol Park, Shinae Yi, Na Rae Choi, Mi Ae Lim, Jae Won Chang, Ho-Ryun Won, Je Ryong Kim, Hye Mi Ko, Eun-Jae Chung, Young Joo Park, Sun Wook Cho, Hyeong Won Yu, June Young Choi, Min-Kyung Yeo, Boram Yi, Kijong Yi, Joonoh Lim, Jun-Young K
Nature Communications.2024;[Epub] CrossRef

Calcium & Bone Metabolism
Sclerostin as a Putative Myokine in Sarcopenia: Hyon-Seung Yi; Endocrinol Metab. 2022;37(3):430-431. Published online June 29, 2022; DOI: https://doi.org/10.3803/EnM.2022.303

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Organokines, Sarcopenia, and Metabolic Repercussions: The Vicious Cycle and the Interplay with Exercise
Giulia Minniti, Letícia Maria Pescinini-Salzedas, Guilherme Almeida dos Santos Minniti, Lucas Fornari Laurindo, Sandra Maria Barbalho, Renata Vargas Sinatora, Lance Alan Sloan, Rafael Santos de Argollo Haber, Adriano Cressoni Araújo, Karina Quesada, Jesse
International Journal of Molecular Sciences.2022; 23(21): 13452. CrossRef

Thyroid
Seaweed and Iodine Intakes and SLC5A5 rs77277498 in Relation to Thyroid Cancer: Tung Hoang, Eun Kyung Lee, Jeonghee Lee, Yul Hwangbo, Jeongseon Kim; Endocrinol Metab. 2022;37(3):513-523. Published online May 24, 2022; DOI: https://doi.org/10.3803/EnM.2021.1306

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Background
This study aims to elucidate the associations among dietary seaweed (gim and miyeok/dashima) and iodine intakes, the rs77277498 polymorphism of the SLC5A5 gene codifying the sodium/iodine symporter, and thyroid cancer risk in a Korean population.
Methods
We conducted a case-control study of 117 thyroid cancer cases and 173 controls who participated in the Cancer Screenee Cohort between 2002 and 2014 at the National Cancer Center, Korea. The amount of seaweed and iodine consumption (g/day) was estimated using the residual energy adjustment method. We calculated odds ratios (ORs) and their 95% confidence intervals (CIs) using a multivariable logistic regression model for the separate and combined effect of dietary iodine-based intake and SLC5A5 polymorphism (rs77277498, C>G) on thyroid cancer.
Results
Dietary gim and iodine intakes were inversely associated with thyroid cancer, with ORs of 0.50 (95% CI, 0.30 to 0.83) and 0.57 (95% CI, 0.35 to 0.95), respectively, whereas the associations for dietary miyeok/dashima and total seaweed intakes were not significant. However, compared with individuals carrying the C/C genotype of the rs77277498 polymorphism with a low intake of all dietary factors, those carrying the G allele with a high intake had a lower risk of thyroid cancer, with ORs of 0.25 (95% CI, 0.10 to 0.56), 0.31 (95% CI, 0.12 to 0.77), 0.26 (95% CI, 0.10 to 0.62), and 0.30 (95% CI, 0.12 to 0.73) for the consumption of gim, miyeok/dashima, total seaweed, and iodine, respectively.
Conclusion
In summary, our results supported the evidence of the protective effects of dietary gim and iodine intake against thyroid cancer risk, and this association can be strengthened by SLC5A5 rs77277498 genotypes.

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Iodine nutrition and papillary thyroid cancer
Xueqi Zhang, Fan Zhang, Qiuxian Li, Chuyao Feng, Weiping Teng
Frontiers in Nutrition.2022;[Epub] CrossRef

Most cited