Endocrinology and Metabolism

Original Articles

Mineral, Bone & Muscle
Carnitine Metabolite as a Potential Circulating Biomarker for Sarcopenia in Men: Je Hyun Seo, Jung-Min Koh, Han Jin Cho, Hanjun Kim, Young‑Sun Lee, Su Jung Kim, Pil Whan Yoon, Won Kim, Sung Jin Bae, Hong-Kyu Kim, Hyun Ju Yoo, Seung Hun Lee; Endocrinol Metab. 2025;40(1):93-102. Published online November 28, 2024; DOI: https://doi.org/10.3803/EnM.2024.2117

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Abstract PDF Supplementary Material PubReader ePub: Background
Sarcopenia, a multifactorial disorder involving metabolic disturbance, suggests potential for metabolite biomarkers. Carnitine (CN), essential for skeletal muscle energy metabolism, may be a candidate biomarker. We investigated whether CN metabolites are biomarkers for sarcopenia.
Methods
Associations between the CN metabolites identified from an animal model of sarcopenia and muscle cells and sarcopenia status were evaluated in men from an age-matched discovery (72 cases, 72 controls) and a validation (21 cases, 47 controls) cohort.
Results
An association between CN metabolites and sarcopenia showed in mouse and cell studies. In the discovery cohort, plasma C5-CN levels were lower in sarcopenic men (P=0.005). C5-CN levels in men tended to be associated with handgrip strength (HGS) (P=0.098) and were significantly associated with skeletal muscle mass (P=0.003). Each standard deviation increase in C5-CN levels reduced the odds of low muscle mass (odd ratio, 0.61; 95% confidence interval [CI], 0.42 to 0.89). The area under the receiver operating characteristic curve (AUROC) of CN score using a regression equation of C5-CN levels, for sarcopenia was 0.635 (95% CI, 0.544 to 0.726). In the discovery cohort, addition of CN score to HGS significantly improved AUROC from 0.646 (95% CI, 0.575 to 0.717; HGS only) to 0.727 (95% CI, 0.643 to 0.810; P=0.006; HGS+CN score). The improvement was confirmed in the validation cohort (AUROC=0.563; 95% CI, 0.470 to 0.656 for HGS; and AUROC=0.712; 95% CI, 0.569 to 0.855 for HGS+CN score; P=0.027).
Conclusion
C5-CN, indicative of low muscle mass, is a potential circulating biomarker for sarcopenia in men. Further studies are required to confirm these results and explore sarcopenia-related metabolomic changes.

Mineral, Bone & Muscle
Unveiling Genetic Variants Underlying Vitamin D Deficiency in Multiple Korean Cohorts by a Genome-Wide Association Study: Ye An Kim, Ji Won Yoon, Young Lee, Hyuk Jin Choi, Jae Won Yun, Eunsin Bae, Seung-Hyun Kwon, So Eun Ahn, Ah-Ra Do, Heejin Jin, Sungho Won, Do Joon Park, Chan Soo Shin, Je Hyun Seo; Endocrinol Metab. 2021;36(6):1189-1200. Published online December 2, 2021; DOI: https://doi.org/10.3803/EnM.2021.1241

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Abstract PDF Supplementary Material PubReader ePub

Background
Epidemiological data have shown that vitamin D deficiency is highly prevalent in Korea. Genetic factors influencing vitamin D deficiency in humans have been studied in Europe but are less known in East Asian countries, including Korea. We aimed to investigate the genetic factors related to vitamin D levels in Korean people using a genome-wide association study (GWAS).
Methods
We included 12,642 subjects from three different genetic cohorts consisting of Korean participants. The GWAS was performed on 7,590 individuals using linear or logistic regression meta- and mega-analyses. After identifying significant single nucleotide polymorphisms (SNPs), we calculated heritability and performed replication and rare variant analyses. In addition, expression quantitative trait locus (eQTL) analysis for significant SNPs was performed.
Results
rs12803256, in the actin epsilon 1, pseudogene (ACTE1P) gene, was identified as a novel polymorphism associated with vitamin D deficiency. SNPs, such as rs11723621 and rs7041, in the group-specific component gene (GC) and rs11023332 in the phosphodiesterase 3B (PDE3B) gene were significantly associated with vitamin D deficiency in both meta- and mega-analyses. The SNP heritability of the vitamin D concentration was estimated to be 7.23%. eQTL analysis for rs12803256 for the genes related to vitamin D metabolism, including glutamine-dependent NAD(+) synthetase (NADSYN1) and 7-dehydrocholesterol reductase (DHCR7), showed significantly different expression according to alleles.
Conclusion
The genetic factors underlying vitamin D deficiency in Korea included polymorphisms in the GC, PDE3B, NADSYN1, and ACTE1P genes. The biological mechanism of a non-coding SNP (rs12803256) for DHCR7/NADSYN1 on vitamin D concentrations is unclear, warranting further investigations.

Citations

Citations to this article as recorded by

Prevalence and Progression of Vitamin D Deficiency in Greater Beirut and Mount Lebanon From 2013 to 2022: An Analysis of 19,452 Adults
Pia Chedid, Elie Salem‐Sokhn, Said El Shamieh, Rajaa Fakhoury
Journal of Clinical Laboratory Analysis.2025;[Epub] CrossRef
Implications of vitamin D deficiency in systemic inflammation and cardiovascular health
Sanjay Kumar Dey, Shashank Kumar, Diksha Rani, Shashank Kumar Maurya, Pratibha Banerjee, Madhur Verma, Sabyasachi Senapati
Critical Reviews in Food Science and Nutrition.2024; 64(28): 10438. CrossRef
Vitamin D-associated genetic variants in the Brazilian population: Investigating potential instruments for Mendelian randomization
Caroline De Souza Silverio , Carolina Bonilla
Biomédica.2024; 44(1): 45. CrossRef
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Diana I. Aparicio-Bautista, Rogelio F. Jiménez-Ortega, Adriana Becerra-Cervera, Arnoldo Aquino-Gálvez, Valeria Ponce de León-Suárez, Leonora Casas-Ávila, Jorge Salmerón, Alberto Hidalgo-Bravo, Berenice Rivera-Paredez, Rafael Velázquez-Cruz
Frontiers in Endocrinology.2024;[Epub] CrossRef
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Jingni Hui, Na Zhang, Meijuan Kang, Yifan Gou, Chen Liu, Ruixue Zhou, Ye Liu, Bingyi Wang, Panxing Shi, Shiqiang Cheng, Xuena Yang, Chuyu Pan, Feng Zhang
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Je Hyun Seo, Young Lee, Hyuk Jin Choi
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Association between Vitamin D Deficiency and Clinical Parameters in Men and Women Aged 50 Years or Older: A Cross-Sectional Cohort Study
Ji Hyun Lee, Ye An Kim, Young Sik Kim, Young Lee, Je Hyun Seo
Nutrients.2023; 15(13): 3043. CrossRef
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Rihwa Choi, Sung-Eun Cho, Sang Gon Lee, Eun Hee Lee
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The Multiple Effects of Vitamin D against Chronic Diseases: From Reduction of Lipid Peroxidation to Updated Evidence from Clinical Studies
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A Genome-Wide Association Study of Genetic Variants of Apolipoprotein A1 Levels and Their Association with Vitamin D in Korean Cohorts
Young Lee, Ji Won Yoon, Ye An Kim, Hyuk Jin Choi, Byung Woo Yoon, Je Hyun Seo
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Genetic Determinants of 25-Hydroxyvitamin D Concentrations and Their Relevance to Public Health
Elina Hyppönen, Karani S. Vimaleswaran, Ang Zhou
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The genetic and epigenetic contributions to the development of nutritional rickets
Innocent Ogunmwonyi, Adewale Adebajo, Jeremy Mark Wilkinson
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Characterization of Incidentally Detected Adrenal Pheochromocytoma.: Ye An Kim, Yul Hwangbo, Min Joo Kim, Hyung Jin Choi, Je Hyun Seo, Yenna Lee, Soo Heun Kwak, Eu Jeong Ku, Tae Jung Oh, Eun Roh, Jae Hyun Bae, Jung Hee Kim, Kyoung Soo Park, Seong Yeon Kim; Endocrinol Metab. 2012;27(2):132-137. Published online June 20, 2012; DOI: https://doi.org/10.3803/EnM.2012.27.2.132

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Abstract PDF

BACKGROUND
In approach to an adrenal incidentaloma, early exclusion of pheochromocytoma is clinically important, due to the risk of catecholamine crisis. The aims of this study are to investigate the characteristics of incidentally detected pheochromocytomas, compared with that of the other adrenal incidentalomas, and to compare these characteristics with those of symptomatic pheochromocytomas. METHODS: In this retrospective study, we reviewed the medical records of 198 patients with adrenal incidentaloma from 2001 to 2010. We analyzed the clinical, laboratory and radiological data of pheochromocytomas, in comparison with those of the other adrenal incidentalomas. We also compared the characteristics of these incidentally detected pheochromocytomas with the medical records of 28 pathologically proven pheochromocytomas, diagnosed based on typical symptoms. RESULTS: Among the 198 patients with adrenal incidentaloma, nineteen patients were diagnosed with pheochromocytoma. Pheochromocytomas showed larger size and higher Hounsfield unit at precontrast computed tomography (CT) than did non-pheochromocytomas. All pheochromocytomas were larger than 2.0 cm, and the Hounsfield units were 19 or higher in precontrast CT. When both criteria of size > 2.0 cm and Hounsfield unit > 19 were met, the sensitivity and specificity for the diagnosis of pheochromocytoma were 100% and 79.3%, respectively. Compared with patients with pheochromocytoma, diagnosed based on typical symptoms, patients with incidentally detected pheochromocytoma were older, presented less often with hypertension, and showed lower levels of 24-hour urine metanephrine. CONCLUSION: Adrenal incidentaloma with < 2.0 cm in size or < or = 19 Hounsfield units in precontrast CT imaging was less likely to be a pheochromocytoma. Patients with incidentally discovered pheochromocytoma showed lower catecholamine metabolites, compared with those patients with symptomatic pheochromocytoma.

Citations

Citations to this article as recorded by

Guidelines for the Management of Adrenal Incidentaloma: the Korean Endocrine Society, Committee of Clinical Practice Guidelines
Jung-Min Lee, Mee Kyoung Kim, Seung-Hyun Ko, Jung-Min Koh, Bo-Yeon Kim, Sang-Wan Kim, Soo-Kyung Kim, Hae-Jin Kim, Ohk-Hyun Ryu, Juri Park, Jung-Soo Lim, Seong Yeon Kim, Young Kee Shong, Soon Jib Yoo
The Korean Journal of Medicine.2017; 92(1): 4. CrossRef
Clinical Guidelines for the Management of Adrenal Incidentaloma
Jung-Min Lee, Mee Kyoung Kim, Seung-Hyun Ko, Jung-Min Koh, Bo-Yeon Kim, Sang Wan Kim, Soo-Kyung Kim, Hae Jin Kim, Ohk-Hyun Ryu, Juri Park, Jung Soo Lim, Seong Yeon Kim, Young Kee Shong, Soon Jib Yoo
Endocrinology and Metabolism.2017; 32(2): 200. CrossRef
Characterization of Incidentally Detected Adrenal Pheochromocytoma
Soon Jib Yoo, Woohyeon Kim
Endocrinology and Metabolism.2012; 27(2): 116. CrossRef

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