Endocrinology and Metabolism

Brief Report

Diabetes, obesity and metabolism
Partial Deletion of Perk Improved High-Fat Diet-Induced Glucose Intolerance in Mice: Jooyeop Lee, Min Joo Kim, Seoil Moon, Ji Yoon Lim, Kyong Soo Park, Hye Seung Jung; Endocrinol Metab. 2023;38(6):782-787. Published online November 13, 2023; DOI: https://doi.org/10.3803/EnM.2023.1738

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Abstract PDF Supplementary Material PubReader ePub: Although pancreatic endoplasmic reticulum kinase (PERK) is indispensable to beta cells, low-dose PERK inhibitor improved glucose- stimulated insulin secretion (GSIS) and hyperglycemia in diabetic mice. Current study examined if partial deletion of Perk (Perk^+/-) recapitulated the effects of PERK inhibitor, on the contrary to the complete deletion. Perk^+/- mice and wild-type controls were fed with a high-fat diet (HFD) for 23 weeks. Glucose tolerance was evaluated along with serum insulin levels and islet morphology. Perk^+/- mice on normal chow were comparable to wild-type mice in various metabolic features. HFD-induced obesity was not influenced by Perk reduction; however, HFD-induced glucose intolerance was significantly improved since 15-week HFD. HFD-induced compromises in GSIS were relieved by Perk reduction, accompanied by reductions in phosphorylated PERK and activating transcription factor 4 (ATF4) in the islets. Meanwhile, HFD-induced islet expansion was not significantly affected. In summary, partial deletion of Perk improved glucose tolerance and GSIS impaired by diet-induced obesity, without changes in body weights or islet mass.

Review Article

Miscellaneous
Brown Adipose Tissue: Activation and Metabolism in Humans: Imane Hachemi, Mueez U-Din; Endocrinol Metab. 2023;38(2):214-222. Published online March 27, 2023; DOI: https://doi.org/10.3803/EnM.2023.1659

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Brown adipose tissue (BAT) is a thermogenic organ contributing to non-shivering thermogenesis. BAT becomes active under cold stress via sympathetic nervous system activation. However, recent evidence has suggested that BAT may also be active at thermoneutrality and in a postprandial state. BAT has superior energy dissipation capacity compared to white adipose tissue (WAT) and muscles. Thus, it has been proposed that the recruitment and activation of additional BAT may increase the overall energy-expending capacity in humans, potentially improving current whole-body weight management strategies. Nutrition plays a central role in obesity and weight management. Thus, this review discusses human studies describing BAT hyper-metabolism after dietary interventions. Nutritional agents that can potentially recruit brown adipocytes via the process of BAT-WAT transdifferentiation are also discussed.

Citations

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Spermidine activates adipose tissue thermogenesis through autophagy and fibroblast growth factor 21
Yinhua Ni, Liujie Zheng, Liqian Zhang, Jiamin Li, Yuxiang Pan, Haimei Du, Zhaorong Wang, Zhengwei Fu
The Journal of Nutritional Biochemistry.2024; 125: 109569. CrossRef
A natural sustained-intestinal release formulation of red chili pepper extracted capsaicinoids (Capsifen®) safely modulates energy balance and endurance performance: a randomized, double-blind, placebo-controlled study
N. Roopashree, Das S. Syam, I. M. Krishnakumar, K. N. Mala, Bradley S. Fleenor, Jestin Thomas
Frontiers in Nutrition.2024;[Epub] CrossRef
MRI Methods to Visualize and Quantify Adipose Tissue in Health and Disease
Katerina Nikiforaki, Kostas Marias
Biomedicines.2023; 11(12): 3179. CrossRef

Original Articles

Calcium & Bone Metabolism
Effect of Vitamin D Supplementation on Risk of Fractures and Falls According to Dosage and Interval: A Meta-Analysis: Sung Hye Kong, Han Na Jang, Jung Hee Kim, Sang Wan Kim, Chan Soo Shin; Endocrinol Metab. 2022;37(2):344-358. Published online April 25, 2022; DOI: https://doi.org/10.3803/EnM.2021.1374

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Background
Although recent studies comparing various dosages and intervals of vitamin D supplementation have been published, it is yet to be elucidated whether there is an appropriate dose or interval to provide benefit regarding fracture risk. We aimed to assess the published evidence available to date regarding the putative beneficial effects of vitamin D supplements on fractures and falls according to various dosages and intervals.
Methods
We performed a meta-analysis of randomized controlled studies reporting associations between vitamin D supplementation and the risks of fractures and falls in PubMed, EMBASE, and Cochrane library. Studies with supplements of ergocalciferol or calcitriol, those with a number of event ≤10, or those with a follow-up duration of less than 6 months were also excluded.
Results
Thirty-two studies were included in the final analysis. Vitamin D supplementation with daily dose of 800 to 1,000 mg was associated with lower risks of osteoporotic fracture and fall (pooled relative risk [RR], 0.87; 95% confidence interval [CI], 0.78 to 0.97 and RR, 0.91; 95% CI, 0.85 to 0.98), while studies with <800 or >1,000 mg/day did not. Also, among intervals, daily administration of vitamin D was associated with the reduced risk of falls, while intermittent dose was not. Also, patients with vitamin D deficiency showed a significant risk reduction of falls after vitamin D supplementation.
Conclusion
Daily vitamin D dose of 800 to 1,000 IU was the most probable way to reduce the fracture and fall risk. Further studies designed with various regimens and targeted vitamin D levels are required to elucidate the benefits of vitamin D supplements.

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Vitamin D Supplementation: A Review of the Evidence Arguing for a Daily Dose of 2000 International Units (50 µg) of Vitamin D for Adults in the General Population
Pawel Pludowski, William B. Grant, Spyridon N. Karras, Armin Zittermann, Stefan Pilz
Nutrients.2024; 16(3): 391. CrossRef
Clinical Characteristics and Outcomes of Limb Fractures in Saudi Children
Lamia Aldhbiban, Fai Alhoshan, Raghad Alomari, Shahad A Almatrafi, Yousef Alanazi, Samir Alsayegh, Haifa Y Alfaraidi, Ayman H Jawadi, Fahad N Aljuraibah
Cureus.2024;[Epub] CrossRef
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A.E. Smit, O.C. Meijer, E.M. Winter
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Vitamin D Deficiency in Patients With Low-Energy Hip Fractures in Accordance With the Mediterranean Paradox
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Frontiers in Nutrition.2023;[Epub] CrossRef
Vitamin D and Calcium in Osteoporosis, and the Role of Bone Turnover Markers: A Narrative Review of Recent Data from RCTs
Gavriela Voulgaridou, Sousana K. Papadopoulou, Paraskevi Detopoulou, Despoina Tsoumana, Constantinos Giaginis, Foivi S. Kondyli, Evgenia Lymperaki, Agathi Pritsa
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Yaohui Yu, Yudan Wang, Xiaoli Hou, Faming Tian
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Sadao Yoshida, Ryo Shiraishi, Yuki Nakayama, Yasuko Taira
Nutrients.2023; 15(13): 2991. CrossRef
Safety Profile of Vitamin D in Italy: An Analysis of Spontaneous Reports of Adverse Reactions Related to Drugs and Food Supplements
Valentina Maggini, Giada Crescioli, Ilaria Ippoliti, Eugenia Gallo, Francesca Menniti-Ippolito, Adelaide Chiaravalloti, Vittorio Mascherini, Roberto Da Cas, Simona Potenza, Giulia Gritti, Maria Galiulo, Laura Sottosanti, Alfredo Vannacci, Niccolò Lombardi
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Cholecalciferol Use Is Associated With a Decreased Risk of Incident Morphometric Vertebral Fractures in Acromegaly
Sabrina Chiloiro, Stefano Frara, Irene Gagliardi, Antonio Bianchi, Antonella Giampietro, Margherita Medici, Agnese Allora, Luigi di Filippo, Maria Rosaria Ambrosio, Alfredo Pontecorvi, Maria Chiara Zatelli, Laura De Marinis, Andrea Giustina
The Journal of Clinical Endocrinology & Metabolism.2023; 109(1): e58. CrossRef
Proceedings of the 2023 Santa Fe Bone Symposium: Progress and Controversies in the Management of Patients with Skeletal Diseases
E. Michael Lewiecki, Teresita Bellido, John P. Bilezikian, Jacques P. Brown, Azeez Farooki, Christopher S. Kovacs, Brendan Lee, William D. Leslie, Michael R. McClung, Mark L. Prasarn, Deborah E. Sellmeyer
Journal of Clinical Densitometry.2023; 26(4): 101432. CrossRef
Diagnosis, prevention and treatment of vitamin D deficiency in adults: Ukrainian experts consensus statement
N.V. Grygorieva, M.D. Tronko, V.M. Kovalenko, S.V. Komisarenko, T.F. Tatarchuk, N.V. Dedukh, M.M. Veliky, S.S. Strafun, Y.I. Komisarenko, A.V. Kalashnikov, V.L. Orlenko, V.I. Pankiv, O.V. Shvets, I.V. Gogunska, S.I. Regeda
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Malgorzata Kupisz-Urbanska, Ewa Marcinowska-Suchowierska
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Role of vitamin D supplementation in the management of musculoskeletal diseases: update from an European Society of Clinical and Economical Aspects of Osteoporosis, Osteoarthritis and Musculoskeletal Diseases (ESCEO) working group
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The Relationship of Osteoporosis with Menopause: Review of Article
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Thyroid
Evaluation of Iodine Status among Korean Patients with Papillary Thyroid Cancer Using Dietary and Urinary Iodine: Ji Yeon Choi, Joon-Hyop Lee, YoonJu Song; Endocrinol Metab. 2021;36(3):607-618. Published online June 21, 2021; DOI: https://doi.org/10.3803/EnM.2021.1005

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Background
Concerns have been raised regarding thyroid disorders caused by excessive iodine in Koreans, who have iodine-rich diets. This study evaluated iodine status using dietary iodine intake and urinary iodine in papillary thyroid cancer (PTC) patients.
Methods
Dietary data of PTC patients were assessed using a 24-hour recall and food frequency questionnaire (FFQ), and urinary iodine concentrations (UICs) were also obtained. To compare the iodine status of PTC patients, Korean adults with or without thyroid disease from the Korea National Health and Nutrition Examination Survey, which had 24-hour recall data and urinary iodine measurements, were analyzed.
Results
The median daily iodine intake by 24-hour recall was 341.7 μg/day in PTC patients, similar to the levels of other Korean adults. Based on UICs, the prevalence of excessive iodine was 54.4% in PTC patients, which was similar to the prevalence among subjects with thyroid disease (55.4%) but slightly higher than that in subjects without thyroid disease (47.7%). Based on dietary iodine by 24-hour recall, the prevalence of excessive iodine intake was 7.2%, which was higher than that among subjects with (4.4%) or without (3.9%) thyroid disease. The dietary iodine intake based on 24-hour recall was closely correlated with the UIC (r=0.4826) in PTC patients, but dietary iodine by FFQ was not significantly correlated with either 24-hour recall or UIC-based dietary iodine.
Conclusion
Excessive iodine intake was more common in PTC patients than in subjects without thyroid disease. Further longitudinal research is necessary to elucidate the role of dietary iodine in PTC.

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Association between iodine nutrition and cervical lymph node metastasis of papillary thyroid microcarcinoma
Hengqiang Zhao, Jin Hu, Le Cui, Yiping Gong, Tao Huang
Frontiers in Endocrinology.2023;[Epub] CrossRef
Effect of iodine restriction on short-term changes in thyroid function in patients with subclinical hypothyroidism
Obin Kwon, Dong Yeob Shin, Eun Jig Lee
Journal of Nutrition and Health.2022; 55(2): 250. CrossRef
Iodine nutrition and papillary thyroid cancer
Xueqi Zhang, Fan Zhang, Qiuxian Li, Chuyao Feng, Weiping Teng
Frontiers in Nutrition.2022;[Epub] CrossRef

Endocrine Research
DEHP Down-Regulates Tshr Gene Expression in Rat Thyroid Tissues and FRTL-5 Rat Thyrocytes: A Potential Mechanism of Thyroid Disruption: Min Joo Kim, Hwan Hee Kim, Young Shin Song, Ok-Hee Kim, Kyungho Choi, Sujin Kim, Byung-Chul Oh, Young Joo Park; Endocrinol Metab. 2021;36(2):447-454. Published online March 31, 2021; DOI: https://doi.org/10.3803/EnM.2020.920

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Background
Di-2-ethylhexyl phthalate (DEHP) is known to disrupt thyroid hormonal status. However, the underlying molecular mechanism of this disruption is unclear. Therefore, we investigated the direct effects of DEHP on the thyroid gland.
Methods
DEHP (vehicle, 50 mg/kg, and 500 mg/kg) was administered to Sprague-Dawley rats for 2 weeks. The expression of the thyroid hormone synthesis pathway in rat thyroid tissues was analyzed through RNA sequencing analysis, quantitative reverse transcription-polymerase chain reaction (RT-PCR), and immunohistochemical (IHC) staining. DEHP was treated to FRTL-5 rat thyroid cells, and an RT-PCR analysis was performed. A reporter gene assay containing the promoter of thyroid stimulating hormone receptor (TSHR) in Nthy-ori 3-1 human thyroid cells was constructed, and luciferase activity was determined.
Results
After DEHP treatment, the free thyroxine (T4) and total T4 levels in rats significantly decreased. RNA sequencing analysis of rat thyroid tissues showed little difference between vehicle and DEHP groups. In the RT-PCR analysis, Tshr expression was significantly lower in both DEHP groups (50 and 500 mg/kg) compared to that in the vehicle group, and IHC staining showed that TSHR expression in the 50 mg/kg DEHP group significantly decreased. DEHP treatment to FRTL-5 cells significantly down-regulated Tshr expression. DEHP treatment also reduced luciferase activity in a reporter gene assay for TSHR.
Conclusion
Although overall genetic changes in the thyroid hormone synthesis pathway are not clear, DEHP exposure could significantly down-regulate Tshr expression in thyroid glands. Down-regulation of Tshr gene appears to be one of potential mechanisms of thyroid disruption by DEHP exposure.

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ARTS is essential for di-2-ethylhexyl phthalate (DEHP)-induced apoptosis of mouse Leydig cells
Yue Li, Linlin Xu, Chaoju Hao, Si Yang, Jinglei Wang, Jiaxiang Chen
Ecotoxicology and Environmental Safety.2024; 270: 115882. CrossRef
Thyroid dysfunction caused by exposure to environmental endocrine disruptors and the underlying mechanism: A review
Jie He, Jie Xu, Mucong Zheng, Kai Pan, Lilin Yang, Lina Ma, Chuyang Wang, Jie Yu
Chemico-Biological Interactions.2024; 391: 110909. CrossRef
Intrauterine exposure to di(2-ethylhexyl) phthalate (DEHP) disrupts the function of the hypothalamus-pituitary-thyroid axis of the F1 rats during adult life
Érica Kássia Sousa-Vidal, Guilherme Henrique, Renata Elen Costa da Silva, Caroline Serrano-Nascimento
Frontiers in Endocrinology.2023;[Epub] CrossRef
Drinking water disinfection byproduct iodoacetic acid affects thyroid hormone synthesis in Nthy-ori 3–1 cells
Jingyi Xiao, Yujie Sha, Yuwen Huang, Kunling Long, Huan Wu, Yan Mo, Qiyuan Yang, Shengkun Dong, Qiang Zeng, Xiao Wei
Ecotoxicology and Environmental Safety.2023; 257: 114926. CrossRef
Assessment of five typical environmental endocrine disruptors and thyroid cancer risk: a meta-analysis
Yuyao Yang, Xiaoyue Bai, Juan Lu, Ronghao Zou, Rui Ding, Xiaohui Hua
Frontiers in Endocrinology.2023;[Epub] CrossRef
Investigation of the effects of phthalates on in vitro thyroid models with RNA-Seq and ATAC-Seq
Marta Nazzari, Mírian Romitti, Duncan Hauser, Daniel J. Carvalho, Stefan Giselbrecht, Lorenzo Moroni, Sabine Costagliola, Florian Caiment
Frontiers in Endocrinology.2023;[Epub] CrossRef
Di(2-ethylhexyl) phthalate (DEHP) and thyroid: biological mechanisms of interference and possible clinical implications
Xueting Zhang, Wen Qi, Qi Xu, Xu Li, Liting Zhou, Lin Ye
Environmental Science and Pollution Research.2022; 29(2): 1634. CrossRef
The possible thyroid disruptive effect of di-(2-ethyl hexyl) phthalate and the potential protective role of selenium and curcumin nanoparticles: a toxicological and histological study
Naima Abd El-Halim Sherif, Asmaa El-Banna, Rehab Ahmed Abdel-Moneim, Zahraa Khalifa Sobh, Manal Ibrahim Fathy Balah
Toxicology Research.2022; 11(1): 108. CrossRef
Environmental disruption of reproductive rhythms
Marie-Azélie Moralia, Clarisse Quignon, Marine Simonneaux, Valérie Simonneaux
Frontiers in Neuroendocrinology.2022; 66: 100990. CrossRef
Endocrine-disruptor endpoints in the ovary and thyroid of adult female rats exposed to realistic doses of di-(2-ethylhexyl) phthalate
Amel Jebara, Asma Beltifa, Guissepa Di Bella, Lotfi Mabrouk, Hedi Ben Mansour
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The influence of sunitinib and sorafenib, two tyrosine kinase inhibitors, on development and thyroid system in zebrafish larvae
Gang Wei, Cao-xu Zhang, Yu Jing, Xia Chen, Huai-dong Song, Liu Yang
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Role of estrogen receptors in thyroid toxicity induced by mono (2-ethylhexyl) phthalate via endoplasmic reticulum stress: An in vitro mechanistic investigation
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Clinical Study
Effects of a Portfolio-Mediterranean Diet and a Mediterranean Diet with or without a Sterol-Enriched Yogurt in Individuals with Hypercholesterolemia: Yvelise Ferro, Elisa Mazza, Mariantonietta Salvati, Emma Santariga, Salvatore Giampà, Rocco Spagnuolo, Patrizia Doldo, Roberta Pujia, Adriana Coppola, Carmine Gazzaruso, Arturo Pujia, Tiziana Montalcini; Endocrinol Metab. 2020;35(2):298-307. Published online June 24, 2020; DOI: https://doi.org/10.3803/EnM.2020.35.2.298

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Background
A growing number of functional foods have been proposed to reduce cholesterol levels and the Portfolio Diet, which includes a combination of plant sterols, fibres, nuts, and soy protein, reduces low density lipoprotein cholesterol (LDL-C) from 20% to 30% in individuals with hyperlipidaemia. In this pilot study, the aim was to investigate whether a Mediterranean Diet incorporating a new and simple combination of cholesterol-lowering foods, excluding soy and nuts (namely the Portfolio-Mediterranean Diet), would reduce LDL-C levels, in the short-term, better than a Mediterranean Diet plus a sterol-enriched yogurt or a Mediterranean Diet alone.
Methods
We retrospectively evaluated 24 individuals on a Portfolio-Mediterranean Diet and 48 matched individuals on a Mediterranean Diet with or without a sterol-enriched yogurt (24 each groups) as controls.
Results
At follow-up (after 48±12 days), we observed an LDL reduction of 21±4, 23±4, and 44±4 mg/dL in the Mediterranean Diet alone, Mediterranean Diet plus yogurt and Portfolio-Mediterranean Diet respectively (P<0.001).
Conclusion
A Portfolio-Mediterranean Diet, incorporating a new combination of functional foods such as oats or barley, plant sterols, chitosan, and green tea but not soy and nuts, may reduce LDL of 25% in the short term in individuals with hypercholesterolemia.

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Ying Wang, Tao Wang, Zhangtie Wang, Yiwen Guo, Ruijie Liu, Ming Chang
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Phyto-Enrichment of Yogurt to Control Hypercholesterolemia: A Functional Approach
Harsh Kumar, Kanchan Bhardwaj, Natália Cruz-Martins, Ruchi Sharma, Shahida Anusha Siddiqui, Daljeet Singh Dhanjal, Reena Singh, Chirag Chopra, Adriana Dantas, Rachna Verma, Noura S. Dosoky, Dinesh Kumar
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Mediterranean Diet a Potential Strategy against SARS-CoV-2 Infection: A Narrative Review
Yvelise Ferro, Roberta Pujia, Samantha Maurotti, Giada Boragina, Angela Mirarchi, Patrizia Gnagnarella, Elisa Mazza
Medicina.2021; 57(12): 1389. CrossRef

Review Article

Calcium and Cardiovascular Disease: Ian R. Reid, Sarah M. Birstow, Mark J. Bolland; Endocrinol Metab. 2017;32(3):339-349. Published online September 18, 2017; DOI: https://doi.org/10.3803/EnM.2017.32.3.339

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Circulating calcium is a risk factor for vascular disease, a conclusion arising from prospective studies involving hundreds of thousands of participants and extending over periods of up to 30 years. These associations may be partially mediated by other cardiovascular risk factors such as circulating lipid levels, blood pressure, and body mass index, but there appears to be a residual independent effect of serum calcium. Polymorphisms of the calcium-sensing receptor associated with small elevations of serum calcium are also associated with cardiovascular disease, suggesting that calcium plays a causative role. Trials of calcium supplements in patients on dialysis and those with less severe renal failure demonstrate increased mortality and/or acceleration of vascular disease, and meta-analyses of trials in those without overt renal disease suggest a similar adverse effect. Interpretation of the latter trials is complicated by a significant interaction between baseline use of calcium supplements and the effect of randomisation to calcium in the largest trial. Restriction of analysis to those who are calcium-naive demonstrates a consistent adverse effect. Observational studies of dietary calcium do not demonstrate a consistent adverse effect on cardiovascular health, though very high or very low intakes may be deleterious. Thus, obtaining calcium from the diet rather than supplements is to be encouraged.

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Original Articles

Endocrine Research
The Effects of High Fat Diet and Resveratrol on Mitochondrial Activity of Brown Adipocytes: Cheol Ryong Ku, Yoon Hee Cho, Zhen-Yu Hong, Ha Lee, Sue Ji Lee, Seung-soo Hong, Eun Jig Lee; Endocrinol Metab. 2016;31(2):328-335. Published online April 8, 2016; DOI: https://doi.org/10.3803/EnM.2016.31.2.328

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Abstract PDF PubReader

Background

Resveratrol (RSV) is a polyphenolic phytoalexin that has many effects on metabolic diseases such as diabetes and obesity. Given the importance of brown adipose tissue (BAT) for energy expenditure, we investigated the effects of RSV on brown adipocytes.

Methods

For the in vitro study, interscapular BAT was isolated from 7-week-old male Sprague Dawley rats. For the in vivo study, 7-week-old male Otsuka Long Evans Tokushima Fatty (OLETF) rats were divided into four groups and treated for 27 weeks with: standard diet (SD); SD+RSV (10 mg/kg body weight, daily); high fat diet (HFD); HFD+RSV. RSV was provided via oral gavage once daily during the in vivo experiments.

Results

RSV treatment of primary cultured brown preadipocytes promoted mitochondrial activity, along with over-expression of estrogen receptor α (ER-α). In OLETF rats, both HFD and RSV treatment increased the weight of BAT and the differentiation of BAT. However, only RSV increased the mitochondrial activity and ER-α expression of BAT in the HFD-fed group. Finally, RSV improved the insulin sensitivity of OLETF rats by increasing the mitochondrial activity of BAT, despite having no effects on white adipocytes and muscles in either diet group.

Conclusion

RSV could improve insulin resistance, which might be associated with mitochondrial activity of brown adipocyte. Further studies evaluating the activity of RSV for both the differentiation and mitochondrial activity of BAT could be helpful in investigating the effects of RSV on metabolic parameters.

Citations

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Obesity and Metabolism
Associations between Dietary Acid-Base Load and Cardiometabolic Risk Factors in Adults: The Tehran Lipid and Glucose Study: Zahra Bahadoran, Parvin Mirmiran, Hadise Khosravi, Fereidoun Azizi; Endocrinol Metab. 2015;30(2):201-207. Published online June 30, 2015; DOI: https://doi.org/10.3803/EnM.2015.30.2.201

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Abstract PDF PubReader

Background

In this study we investigated the associations of dietary acid-base load, identified by potential renal acid load (PRAL) and protein to potassium (Pro:K) ratio, with cardiometabolic risk factors in Tehranian adults.

Methods

A cross-sectional study was conducted within the framework of the fourth phase of the Tehran Lipid and Glucose Study (2009 to 2011) on 5,620 men and women aged 19 to 70 years. Dietary data were collected by a trained dietitian using a validated, 147-food item, semi-quantitative food frequency questionnaire, and dietary PRAL and Pro:K ratio were calculated. Multiple linear regression models with adjustment for potential confounding variables were used to evaluate the associations of dietary acid-base load with anthropometric measures, blood pressure, serum triglycerides, high density lipoprotein cholesterol (HDL-C), serum creatinine, and fasting blood glucose.

Results

The mean±SD age of the participants was 39.8±12.8 years and 54% of participants were women. Mean±SD PRAL was -22.0±29.1; mean PRAL was -15.6 in men and -26.8 in women. Dietary PRAL was associated with weight (β=0.098, P<0.001), waist circumference (β=0.062, P<0.01), serum triglycerides (β=0.143, P<0.01), HDL-C (β=-0.11, P<0.01), diastolic blood pressure (β=0.062, P<0.01), and serum creatinine (β=0.142, P<0.001). Pro:K ratio was associated with weight (β=0.055, P<0.001), waist circumference (β=0.04, P<0.01), serum HDL-C (β=-0.06, P<0.01), serum triglycerides (β=0.03, P<0.05), diastolic blood pressure (β=0.026, P<0.05), and serum creatinine (β=0.07, P<0.01).

Conclusion

A more acidic dietary acid-base load may be a risk factor for the development of metabolic disorders.

Citations

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Mohsen Mazidi, Dimitri P. Mikhailidis, Maciej Banach
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Growth Hormone-Releaser Diet Attenuates Cognitive Dysfunction in Klotho Mutant Mice via Insulin-Like Growth Factor-1 Receptor Activation in a Genetic Aging Model: Seok Joo Park, Yoon Hee Chung, Jeong Hyun Lee, Duy-Khanh Dang, Yunsung Nam, Ji Hoon Jeong, Yong Sun Kim, Toshitaka Nabeshima, Eun-Joo Shin, Hyoung-Chun Kim; Endocrinol Metab. 2014;29(3):336-348. Published online September 25, 2014; DOI: https://doi.org/10.3803/EnM.2014.29.3.336

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Background

It has been recognized that a defect in klotho gene expression accelerates the degeneration of multiple age-sensitive traits. Accumulating evidence indicates that aging is associated with declines in cognitive function and the activity of growth hormone (GH)/insulin-like growth factor-1 (IGF-1).

Methods

In this study, we examined whether a GH-releaser diet could be effective in protecting against cognitive impairment in klotho mutant mice.

Results

The GH-releaser diet significantly induced the expression of IGF-1 and IGF-1 receptors in the hippocampus of klotho mutant mice. Klotho mutant mice showed significant memory impairments as compared with wild-type mice. In addition, the klotho mutation significantly decreased the expression of cell survival/antiapoptotic factors, including phospho-Akt (p-Akt)/phospho-glycogen synthase kinase3β (p-GSK3β), phospho-extracellular signal-related kinase (p-ERK), and Bcl-2, but significantly increased those of cell death/proapoptotic factors, such as phospho-c-jun N-terminal kinase (p-JNK), Bax, and cleaved caspase-3 in the hippocampus. Treatment with GH-releaser diet significantly attenuated both decreases in the expression of cell survival/antiapoptotic factors and increases in the expression of cell death/proapoptotic factors in the hippocampus of klotho mutant mice. In addition, klotho mutation-induced oxidative stress was significantly attenuated by the GH-releaser diet. Consequently, a GH-releaser diet significantly improved memory function in the klotho mutant mice. GH-releaser diet-mediated actions were significantly reversed by JB-1, an IGF-1 receptor antagonist.

Conclusion

The results suggest that a GH-releaser diet attenuates oxidative stress, proapoptotic changes and consequent dysfunction in klotho mutant mice by promoting IGF-1 expression and IGF-1 receptor activation.

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Accelerated and Exacerbated Effects of High Dietary Fat on Neuronal Damage Induced by Transient Cerebral Ischemia in the Gerbil Septum: Seung Hwan Cheon, Bing Chun Yan, Bai Hui Chen, Joon Ha Park, Ji Hyeon Ahn, In Hye Kim, Jae-Chul Lee, Yoo Seok Park, Min Joung Kim, Yun Lyul Lee, Jun Hwi Cho, Moo-Ho Won; Endocrinol Metab. 2014;29(3):328-335. Published online September 25, 2014; DOI: https://doi.org/10.3803/EnM.2014.29.3.328

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Background

Obesity induced by high-fat diet (HFD) is one of the most widespread metabolic disorders in current society. However, there has been little research regarding the effects of HFD-induced obesity in the septa of animal models of cerebral ischemia. Therefore, in the present study, we investigated septal effects of HFD on neuronal damage and gliosis induced by transient cerebral ischemia.

Methods

Body weight, blood glucose levels and serum lipid profiles levels were measured both in the normal diet (ND) and HFD-group. We also investigated the effects of ND and HFD on neuronal damage and gliosis in the septum after transient cerebral ischemia using immunohistochemistry.

Results

The levels of blood glucose, serum triglyceride, and total cholesterol were significantly increased in the HFD-fed gerbils compared with the ND-fed gerbils, although body weight was not significantly changed after HFD feeding. In the ND-fed gerbils, ischemia-induced neuronal damage was found in the septohippocampal nucleus (SHN) of the septum 7 days after ischemia. In the HFD-fed gerbils, ischemia-induced neuronal damage in the SHN was much more severe compared with that of the ND-fed gerbils 4 and 7 days after ischemia. In addition, we found that ischemia-induced glial activation including astrocytes and microglia was accelerated and exacerbated in the HFD-fed gerbils compared with that in the ND-fed gerbils.

Conclusion

These results indicate that HFD can lead to much more severe effects in ischemia-induced neuronal damage/death in the septum after ischemia-reperfusion, and that it may be associated with accelerated change in glial activation.

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Review Article

Thyroid
Low Iodine Diet for Preparation for Radioactive Iodine Therapy in Differentiated Thyroid Carcinoma in Korea: Jae Hoon Chung; Endocrinol Metab. 2013;28(3):157-163. Published online September 13, 2013; DOI: https://doi.org/10.3803/EnM.2013.28.3.157

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Preparation for radioactive iodine (RAI) therapy includes an increased serum thyroid stimulating hormone level and a low iodine diet (LID). Because of extremely high iodine intake, some physicians have advocated a more stringent LID for greater than 2 weeks in Korean patients with thyroid cancer prior to RAI therapy; however, it is very difficult to maintain a stringent LID for a longer period of time. According to recent reports in Korea, a nonstringent, simple LID for only 1 week might be enough prior to RAI therapy, if the patients can be educated intensively by specially trained staff. The measurement of simple urinary iodine concentration (UIC; µg/L) may underestimate daily iodine excretion in patients with a urinary volume of more than 1 L/day and can also be affected by dilution status. Simple UIC had a weaker correlation than the iodine/creatinine (I/Cr) ratio. Therefore, the urinary I/Cr ratio can replace 24-hour urine iodine excretion instead of simple UIC, although it may overestimate iodine intake in patients with malnutrition or poor muscle mass. The measurement of serum iodine level might be useful as an adjunct parameter for assessing LID preparation, but its sensitivity and specificity were relatively low compared to the urinary I/Cr ratio.

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Randomized Controlled Trial

The Effect of Intensive Education on Glycemic Control in Type 2 Diabetic Patients.: Youn Wook Lee, Won Sun Hwang, Sun Jung Choe, Dong Hun Lee, Doh Hyun Kim, Eun Hee Lee, Eun Gyoung Hong, Hye Lim Noh, Yoon Sok Chung, Kwan Woo Lee, Hyeon Man Kim; J Korean Endocr Soc. 2003;18(1):63-72. Published online February 1, 2003

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Abstract PDF: BACKGROUND
To this date, efforts to develop effective methods for the education of diabetic patients have been limited. The important goal of self-management and weight control for diabetic treatment can not be attained without long and intensive period of education. This study was undertaken to assess the effectiveness of an intensive educational program, of behavior and diet control, which was carried out on subjects with type 2 diabetes, on an out-patient basis. We compared the effectiveness of an intensive education programme with that of a conventional education programme for the self-management of type 2 diabetic patients. METHODS: Subjects with type 2 diabetes were randomly selected, and allocated to one of two groups. One group received a conventional education programme of self-management(the CE group), and the second group received an intensive education programmes for three months, after which the effectiveness of the programmes were evaluated. RESULTS: 1) The levels of fasting blood sugar(FBS), postprandial 2 hour blood sugar(PP2h) and HbA1c were significantly lowered in both groups following the intervention(p<0.05). In the IE group, the FBS declined from 12.4nmol/L to 7.7nmol/L, PP2h declined from 20.3nmol/L to 10.9nmol/L, and the HbA1c showed a similar decline from 9.4 to 7.0% after intervention(p<0.05). In the CE group, the FBS declined from 10.9 to 9.4nmol/l, the PP2h decreased from 17.1 to 14.6 nmol/l, and the HbA1c also decreased from 8.5 to 7.3% after intervention(p<0.05). The decrease in the FBS and HbA1c following the educational intervention was more pronounced in the IE group than the CE group (p<0.05). 2) The effectiveness of the education programmes in promoting appropriate dietary behavior in the diabetic subjects was assessed by a scoring system in three parts: a regularity score, a balance score and an attitude score. From a comparative study of the three scores, the patients attitudes were observed to be much improved in both the groups following the intervention compared to before the programmes, but the balance and total scores were significantly higher in the IE group than the CE group(p<0.05). CONCLUSION: We can conclude that the intensive diabetic education programme is more effective than a conventional programme, not only in improving the patients' levels of glucose, HbAlc, and dietary score, but also the diabetic patients self-control abilities, promoting behavioral change, and prompting problem solving capabilities in respect to the everyday problems that they have to face throughout their lives.

Original Articles

Association Between Peak Bone Mass and Genetic Polymorphisms of the Vitamin D Receptor, Estrogen Receptor, and Type I Collagen 1 Genes in Healthy Young Korean Women.: Hong Kyu Kim, Sang Wook Kim, Eun Sook Kim, Ghi Su Kim; J Korean Endocr Soc. 2001;16(1):97-114. Published online February 1, 2001

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Abstract PDF: BACKGROUND
Genetic suggest that strongest effect is observed in the premenopausal peak bone mass, which become less with age. However, the evaluation of candidate genes polymorphisms has been most frequently done in postmenopausal women and the results have been controversial. Therefore, we studied the possible association of the peak bone mass and candidate for osteoporosis genes polymorphism in premenopausal women. METHODS: The associations between BMD and polymorphisms of the vitamin D receptor (3'-end region by BsmI restriction enzyme and start codon by FokI restriction enzyme), estrogen receptor (by PvuII and XbaI restriction enzyme), and type I collagen 1 (Sp1 binding site by MscI and BalI restriction enzyme) genes were examined in 100 healthy young Korean women who had a peak bone mass (age 20-35 years). Bone mineral densities were measured by dual energy X-ray absorptiometry (DEXA). Dietary calcium intake was also measured using a food frequency questionnaire. RESULTS: The frequencies of the B allele of the vitamin D receptor gene BsmI polymorphism and the X allele in the estrogen receptor gene, XbaI polymorphisms were lower in Koreans than those in Caucasians. The allelic frequencies of the vitamin vitamin D receptor gene FokI polymorphism and the estrogen receptor gene PvuII polymorphism were similar to those of Caucasians. No significant association was found between BMD and the vitamin D receptor genotype according to BsmI or FokI polymorphisms. There was also no significant relation between the PvuII or XbaI polymorphisms of the estrogen receptor gene and BMD. The associations between BMD and cross-genotypes combining the vitamin D receptor gene (BsmI and FokI) and estrogen receptor gene (PvuII and XbaI) polymorphisms were also analyzed. Among the subjects who lacked the Bf haplotype of the vitamin D receptor gene, the BMD of the femoral neck area was significantly higher in subjects lacking Px haplotypes of the estrogen receptor gene than in those having Px haplotype (p < 0.05). When dietary calcium intake was taken into consideration, there were significant differences in BMD according to the cross-genotype in the group having a low calcium intake (< 500 mg/day). The subjects that lacked the Bf and Px haplotypes had a significantly higher BMD in the femoral neck (p < 0.01), Ward's triangle (p < 0.05), and in the trochanteric area (p < 0.05) than those who lacked Bf but a Px haplotype. We did not find a polymorphism in the Sp1 binding site of the type I collagen 1 gene in our subjects. CONCLUSION: These data suggest that a complex interaction of vitamin D and the estrogen receptor gene with the dietary calcium intake, rather than a polymorphism of a single gene, may influence peak bone mass in healthy young Korean women.

Clinical Report of Effects of Pre and Post-partum Thyroiditis (PPT).: Yong Wook Cho, Myung Seo Kang, Young Soo Cha, Jin Hwan Kook, Yoo Ri Kim, Pil Won Park, Wee Hyun Lee, Jung Eun Lim, Yo Won Cho; J Korean Endocr Soc. 1997;12(4):541-549. Published online January 1, 2001

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Abstract PDF: BACKGROUND
Excessive iodine intake increases the occurrence of autoimmune thyroid disorders by enhancing immunogenecity of iodine-rich thyroglobulin, In Korea, most of postpartum women take a large amount of iodine-rich seaweed. Although the excessive iodine intake may affect the thyroid function, only a few reports were available concering iodine intake, especially on postpartum period. METHODS: A prospective study was undertaken in 146 of normal delivered postpartum women. Dietary intake and urinary excretion of iodine, serum T3, T4, TSH, anti-TPO Ab and anti-Tg Ab were measured before and 1, 6, 12 and 24 weeks after delivery. Iodine intake was analyzed by one-to-one interview using 24hr recall and food frequency questionnaire. RESULTS: 1. PPT was occurred in 6 (10.3%) postparturn women, It presented as hypothyroidism alone in 1 (16.7%), transient thyrotoxicosis followed by hypothyroidisrn in 3 (50.0%), and thyrotoxicosis alone in 2 (33.3%) of the follwed-up patients. 2. During pregnancy, no difference was found in age, serum T3, T4 and TSH between PPT and normal thyroid function group. 3. In PPT group, anti-TPO and anti-Tg Ab were significantly higher than those of normal thyroid function group during pregnancy, and their sensitivity for PPT was 40% and 33%, respectively. But there was no correlation between dietary iodine intake and the titer of thyroid auto-antibodies. 4. There was no correlation between pre and post-partum dietary iodine intake and occurrence of PPT. CONCLUSION: In Korea, the incidence of PPT was slightly higher than other nations. The sensitivity of thyroid auto-antibodies was too low to use for prediction of PPT. Pre and post-partum iodine intake had no effect on the occurrence of PPT and post-partum thyroid function.

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