- Mineral, Bone & Muscle
- Carnitine Metabolite as a Potential Circulating Biomarker for Sarcopenia in Men
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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
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Endocrinol Metab. 2025;40(1):93-102. Published online November 28, 2024
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DOI: https://doi.org/10.3803/EnM.2024.2117
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Abstract
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- 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.
- Miscellaneous
- Quality Matters as Much as Quantity of Skeletal Muscle: Clinical Implications of Myosteatosis in Cardiometabolic Health
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Hong-Kyu Kim, Chul-Hee Kim
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Endocrinol Metab. 2021;36(6):1161-1174. Published online December 28, 2021
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DOI: https://doi.org/10.3803/EnM.2021.1348
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- Although age-related changes in skeletal muscles are closely associated with decreases in muscle strength and functional decline, their associations with cardiometabolic diseases in the literature are inconsistent. Such inconsistency could be explained by the fact that muscle quality—which is closely associated with fatty infiltration of the muscle (i.e., myosteatosis)—is as important as muscle quantity in cardiometabolic health. However, muscle quality has been less explored compared with muscle mass. Moreover, the standard definition of myosteatosis and its assessment methods have not been established yet. Recently, some techniques using single axial computed tomography (CT) images have been introduced and utilized in many studies, as the mass and quality of abdominal muscles could be measured opportunistically on abdominal CT scans obtained during routine clinical care. Yet, the mechanisms by which myosteatosis affect metabolic and cardiovascular health remain largely unknown. In this review, we explore the recent advances in the assessment of myosteatosis and its changes associated with aging. We also review the recent literature on the clinical implication of myosteatosis by focusing on metabolic and cardiovascular diseases. Finally, we discuss the challenges and unanswered questions that need addressing to set myosteatosis as a therapeutic target for the prevention or treatment of cardiometabolic diseases.
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- Diabetes, Obesity and Metabolism
- Prognostic Value of Triglyceride and Glucose Index for Incident Type 2 Diabetes beyond Metabolic Health and Obesity
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Hwi Seung Kim, Jiwoo Lee, Yun Kyung Cho, Eun Hee Kim, Min Jung Lee, Hong-Kyu Kim, Joong-Yeol Park, Woo Je Lee, Chang Hee Jung
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Endocrinol Metab. 2021;36(5):1042-1054. Published online October 21, 2021
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DOI: https://doi.org/10.3803/EnM.2021.1184
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Abstract
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- Background
Metabolically healthy obese (MHO) phenotype is metabolically heterogeneous in terms of type 2 diabetes (T2D). Previously, the triglyceride and glucose (TyG) index has been considered for identifying metabolic health and future risk of T2D. This study aimed to evaluate the risk of incident T2D according to obesity status and metabolic health, categorized by four different criteria and the TyG index.
Methods The study included 39,418 Koreans without T2D at baseline. The risk of T2D was evaluated based on four different definitions of metabolic health and obesity status and according to the baseline TyG index within each metabolic health and obesity group.
Results During the median follow-up at 38.1 months, 726 individuals developed T2D. Compared with the metabolically healthy non-obese (MHNO) group with low TyG index, the MHO group with high TyG index showed increased risk of T2D in all four definitions of metabolic health with multivariate-adjusted hazard ratios of 2.57 (95% confidence interval [CI], 1.76 to 3.75), 3.72 (95% CI, 2.15 to 6.43), 4.13 (95% CI, 2.67 to 6.38), and 3.05 (95% CI, 2.24 to 4.15), when defined by Adult Treatment Panel III, Wildman, Karelis, and homeostasis model assessment (HOMA) criteria, respectively.
Conclusion MHO subjects with high TyG index were at an increased risk of developing T2D compared with MHNO subjects, regardless of the definition of metabolic health. TyG index may serve as an additional factor for predicting the individual risk of incident T2D in MHO subjects.
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Citations
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- Bridging the gap in obesity research: A consensus statement from the European Society for Clinical Investigation
Federico Carbone, Jean‐Pierre Després, John P. A. Ioannidis, Ian J. Neeland, Gabriella Garruti, Luca Busetto, Luca Liberale, Stefano Ministrini, Gemma Vilahur, Thomas H. Schindler, Maria Paula Macedo, Agostino Di Ciaula, Marcin Krawczyk, Andreas Geier, Gy European Journal of Clinical Investigation.2025;[Epub] CrossRef - Association between triglyceride-glucose index and depression in patients with type 2 diabetes: A cross-sectional study from NHANES
Jiaju Ren, Cheng Lv, Jia Wang Medicine.2024; 103(32): e39258. CrossRef - Ling-gui-zhu-gan promotes adipocytes browning via targeting the miR-27b/PRDM16 pathway in 3T3-L1 cells
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Identifying Individuals with Metabolic Syndrome
Shaghayegh Hosseinkhani, Katayoon Forouzanfar, Nastaran Hadizadeh, Farideh Razi, Somayeh Darzi, Fatemeh Bandarian Endocrine, Metabolic & Immune Disorders - Drug Targets.2024; 24(11): 1291. CrossRef
- Clinical Study
- Gender-Dependent Reference Range of Serum Calcitonin Levels in Healthy Korean Adults
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Eyun Song, Min Ji Jeon, Hye Jin Yoo, Sung Jin Bae, Tae Yong Kim, Won Bae Kim, Young Kee Shong, Hong-Kyu Kim, Won Gu Kim
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Endocrinol Metab. 2021;36(2):365-373. Published online April 7, 2021
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DOI: https://doi.org/10.3803/EnM.2020.939
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Abstract
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- Background
Serum calcitonin measurement contains various clinical and methodological aspects. Its reference level is wide and unclear despite sensitive calcitonin kits are available. This study aimed to identify the specific reference range in the healthy Korean adults.
Methods Subjects were ≥20 years with available calcitonin (measured by a two-site immunoradiometric assay) data by a routine health checkup. Three groups were defined as all eligible subjects (group 1, n=10,566); subjects without self or family history of thyroid disease (group 2, n=5,152); and subjects without chronic kidney disease, autoimmune thyroid disease, medication of proton pump inhibitor/H2 blocker/steroid, or other malignancies (group 3, n=4,638).
Results This study included 6,341 male and 4,225 female subjects. Males had higher mean calcitonin than females (2.3 pg/mL vs. 1.9 pg/mL, P<0.001) in group 1. This gender difference remained similar in groups 2 and 3. Calcitonin according to age or body mass index was not significant in both genders. Higher calcitonin in smoking than nonsmoking men was observed but not in women. Sixty-nine subjects had calcitonin higher than the upper reference limit (10 pg/mL) and 64 of them had factors associated with hypercalcitoninemia besides medullary thyroid cancer. Our study suggests the reference intervals for men who were non, ex-, current smokers, and women (irrespective of smoking status) as <5.7, <7.1, <7.9, and <3.6 pg/mL, respectively.
Conclusion Specific calcitonin reference range should be provided considering for sex and smoking status. Taking account for several factors known to induce hypercalcitoninemia can help interpret the gray zone of moderately elevated calcitonin.
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Pierpaolo Trimboli, Giuseppe Peloni, Dorotea Confalonieri, Elena Gamarra, Tommaso Piticchio, Francesco Frasca, Petra Makovac, Arnoldo Piccardo, Lorenzo Ruinelli Frontiers in Oncology.2024;[Epub] CrossRef - Surgical treatment of solid variant of papillary thyroid carcinoma: Fifteen-year experience of a tertiary center
Katarina Tausanović, Marina Stojanović, Milan Jovanović, Boban Stepanović, Jovan Ilić, Sara Ivaniš, Vladan Živaljević Medicinska istrazivanja.2024; 57(1): 121. CrossRef - Impact of dietary, lifestyle and sociodemographic factors on calcitonin levels in a healthy population
Ivana Gunjača, Mirjana Babić Leko, Nikolina Pleić, Ante Jurić, Dubravka Brdar, Vesela Torlak, Marko Vuletić, Ante Punda, Ozren Polašek, Caroline Hayward, Tatijana Zemunik Bone.2024; 187: 117214. CrossRef - Some genetic differences in patients with rheumatoid arthritis
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M. Cvek, A. Punda, M. Brekalo, M. Plosnić, A. Barić, D. Kaličanin, L. Brčić, M. Vuletić, I. Gunjača, V. Torlak Lovrić, V. Škrabić, V. Boraska Perica Journal of Endocrinological Investigation.2022; 45(3): 597. CrossRef - Environmental Factors That Affect Parathyroid Hormone and Calcitonin Levels
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