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OUP accepted manuscript. INTERNATIONAL JOURNAL OF PHARMACY PRACTICE 2022; 30:195-203. [DOI: 10.1093/ijpp/riac003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 01/10/2022] [Indexed: 11/13/2022]
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Hamad M, Mohammed AK, Hachim MY, Mukhopadhy D, Khalique A, Laham A, Dhaiban S, Bajbouj K, Taneera J. Heme Oxygenase-1 (HMOX-1) and inhibitor of differentiation proteins (ID1, ID3) are key response mechanisms against iron-overload in pancreatic β-cells. Mol Cell Endocrinol 2021; 538:111462. [PMID: 34547407 DOI: 10.1016/j.mce.2021.111462] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 09/08/2021] [Accepted: 09/16/2021] [Indexed: 12/13/2022]
Abstract
Iron overload promotes the generation of reactive oxygen species (ROS). Pancreatic β-cells can counter oxidative stress through multiple anti-oxidant responses. Herein, RNA-sequencing was used to describe the expression profile of iron regulatory genes in human islets with or without diabetes. Functional experiments including siRNA silencing, qPCR, western blotting, cell viability, ELISA and RNA-sequencing were performed as means of identifying the genetic signature of the protective response following iron overload-induced stress in human islets and INS-1. FTH1 and FTL genes were highly expressed in human islets and INS-1 cells, while hepcidin (HAMP) was low. FXN, DMT1 and FTHL1 genes were differentially expressed in diabetic islets compared to control. Silencing of Hamp in INS-1 cells impaired insulin secretion and influenced the expression of β-cell key genes. RNA-sequencing analysis in iron overloaded INS-1 cells identified Id1 and Id3 as the top down-regulated genes, while Hmox1 was the top upregulated. Expression of ID1, ID3 and HMOX1 was validated at the protein level in INS-1 cells and human islets. Differentially expressed genes (DEGs) were enriched for TGF-β, regulating stem cells, ferroptosis, and HIF-1 signaling. Hmox1-silenced cells treated with FAC elevated the expression of Id1 and Id3 expression than untreated cells. Our findings suggest that HMOX1, ID1 and ID3 define the response mechanism against iron-overload-induced stress in β-cells.
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Affiliation(s)
- Mawieh Hamad
- Department of Medical Lab. Sciences, College of Health Sciences, University of Sharjah, 27272, Sharjah, United Arab Emirates; Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates
| | - Abdul Khader Mohammed
- Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates
| | - Mahmood Y Hachim
- College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
| | - Debasmita Mukhopadhy
- Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates
| | - Anila Khalique
- Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates
| | - Amina Laham
- Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates
| | - Sarah Dhaiban
- Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates
| | - Khuloud Bajbouj
- Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates
| | - Jalal Taneera
- Sharjah Institute for Medical Research, University of Sharjah, 27272, Sharjah, United Arab Emirates; Department of Basic Medical Sciences, College of Medicine, University of Sharjah, Sharjah, 27272, United Arab Emirates.
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Zhang R, Huang X, Li Y, Yu Z, Wu Y, Zha B, Ding H, Zang S, Liu J. Serum ferritin as a risk factor for type 2 diabetes mellitus, regulated by liver transferrin receptor 2. Endocr Connect 2021; 10:1513-1521. [PMID: 34727090 PMCID: PMC8679876 DOI: 10.1530/ec-21-0316] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 11/02/2021] [Indexed: 11/08/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the effect of TFR2 on iron storage in type 2 diabetes. METHODS A cross-sectional study was conducted among 1938 participants from the Jiangchuan Community of Shanghai. A total of 784 participants with T2DM and 1154 normal participants (non-T2DM) were enrolled in this study. Serum ferritin, fasting blood glucose, postprandial blood glucose, and HbA1C (glycated hemoglobin A1c) levels were determined. Eighteen Wistar male rats were randomly assigned into three groups (n = 6/group): rats in a high-fat diet streptozotocin (HFD+STZ) group were fed with HFD for 4 weeks and intraperitoneally injected with streptozotocin (STZ); rats in a control group were fed with a standard diet for 4 weeks and intraperitoneally injected with buffer; rats in an STZ group were fed with a standard diet for 4 weeks and intraperitoneally injected with streptozotocin. Glucose tolerance test was performed at the end of the study. Blood samples and liver tissues were assessed for liver TFR2, blood glucose, serum ferritin, and iron levels. RESULTS The mean serum ferritin level of T2DM participants was significantly higher than that of the control group (227 (140-352) vs 203.5 (130.5-312) ng/mL, P < 0.05). Serum ferritin level was an independent risk factor for T2DM (high ferritin group vs low ferritin group, 1.304 (1.03-1.651), P < 0.05). Diabetic rats showed reduced liver TFR2 levels, with increased serum ferritin levels. CONCLUSION T2DM participants exhibited iron disorder with elevated serum ferritin levels. Elevated serum ferritin levels in diabetic rats were accompanied by reduced liver TFR2 levels.
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Affiliation(s)
- Rui Zhang
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
| | - Xinmei Huang
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
| | - Yue Li
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
| | - Zhiyan Yu
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
| | - Yueyue Wu
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
| | - Bingbing Zha
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
| | - Heyuan Ding
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
| | - Shufei Zang
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
- Correspondence should be addressed to S Zang or J Liu: or
| | - Jun Liu
- Department of Endocrinology, Shanghai Fifth People’s Hospital affiliated to Fudan University, Minhang District, Shanghai, People’s Republic of China
- Correspondence should be addressed to S Zang or J Liu: or
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Evaluation of the relationship between serum ferritin and insulin resistance and visceral adiposity index (VAI) in women with polycystic ovary syndrome. Eat Weight Disord 2021; 26:1581-1593. [PMID: 32772321 DOI: 10.1007/s40519-020-00980-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 07/30/2020] [Indexed: 01/08/2023] Open
Abstract
PURPOSE There is a relationship between polycystic ovary syndrome (PCOS) and adipose tissue dysfunction (ADD), but this relationship is not clear. It has been recently shown that iron accumulation in adipose tissue is among the causes of adipose tissue dysfunction. Data on adipose tissue dysfunction in women with PCOS are insufficient. In this study, we aimed to evaluate the relationship between serum ferritin levels (iron accumulation biomarker) and visceral adiposity index (an indicator of adipose tissue dysfunction). METHODS The study is a case-control study. Women with diagnosed PCOS with 2003 Rotterdam Diagnostic Criteria (n = 40) were compared with non-PCOS group (n = 40). In this study, the cholesterol ratios, the homeostatic model evaluation index for insulin resistance (HOMA-IR) and the quantitative insulin sensitivity control index were calculated using biochemical parameters, and the visceral adiposity index (VAI) and the lipid accumulation product (LAP) were calculated using both anthropometric and biochemical parameters. In this study, insulin resistance was evaluated by HOMA-IR and adipose tissue dysfunction was evaluated by VAI index. RESULTS According to the results of this study, women with PCOS have a worse metabolic status than women without PCOS. However, this has been shown only in overweight and obese women, not in women with normal weight. CONCLUSION As a result, the presence of obesity in women with PCOS exacerbates metabolic status. LEVEL OF EVIDENCE Level V, cross-sectional descriptive study.
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Karamzad N, Eftekhari A, Ashrafi-Asgarabad A, Sullman MJM, Sahebkar A, Safiri S. Serum Hepcidin, the Hepcidin/Ferritin Ratio and the Risk of Type 2 Diabetes: A Systematic Review and Meta-Analysis. Curr Med Chem 2021; 28:1224-1233. [PMID: 32031063 DOI: 10.2174/0929867327666200207120158] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 01/03/2020] [Accepted: 01/22/2020] [Indexed: 11/22/2022]
Abstract
OBJECTIVES To perform a meta-analysis on the relationship type 2 diabetes has with serum hepcidin and the hepcidin/ferritin ratio. METHODS The following databases were searched using all relevant keywords: Web of Science, Medline, Scopus, Embase and Google Scholar. All studies that examined the relationship type 2 diabetes has with serum hepcidin or the hepcidin/ferritin ratio were included in this meta-analysis and systematic review provided, were published in English between 2011 and 2018. A random-effects model was used to pool the standardized mean difference (SMD). RESULTS The SMD of serum hepcidin among patients with type 2 diabetes and healthy controls were compared across eight studies (n cases=878; n controls=2306). The pooled SMD of serum hepcidin did not differ significantly between study groups (SMD: 0.04; 95% confidence interval (CI): -0.29 to 0.35). In contrast, the serum hepcidin/ferritin ratio was examined across five studies (n cases=229; n controls=1426) and was found to be negatively associated with the risk of type 2 diabetes (SMD: -0.52; 95% confidence interval (CI): -0.85 to -0.19). There was no publication bias found for the associations serum hepcidin (Egger´s test: P =0.97) or the hepcidin/ferritin ratio (Egger´s test: P =0.75) had with type 2 diabetes. CONCLUSION Although hepcidin has been proposed as a risk marker for type 2 diabetes, our metaanalysis found that the hepcidin/ferritin ratio was superior to hepcidin alone as a risk marker.
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Affiliation(s)
- Nahid Karamzad
- Student Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Aziz Eftekhari
- Department of Pharmacology and Toxicology, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Ahad Ashrafi-Asgarabad
- Department of Epidemiology, School of Health, Bam University of Medical Sciences, Bam, Iran
| | - Mark J M Sullman
- School of Humanities and Social Sciences, University of Nicosia, Nicosia, Cyprus
| | | | - Saeid Safiri
- Social Determinants of Health Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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Iron Status in Elderly Women Impacts Myostatin, Adiponectin and Osteocalcin Levels Induced by Nordic Walking Training. Nutrients 2020; 12:nu12041129. [PMID: 32316589 PMCID: PMC7231223 DOI: 10.3390/nu12041129] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 04/09/2020] [Accepted: 04/15/2020] [Indexed: 01/26/2023] Open
Abstract
Impaired iron metabolism is associated with increased risk of many morbidities. Exercise was shown to have a beneficial role; however, the mechanism is not well understood. The purpose of this study was to assess the relationship between exerkines and iron metabolism in elderly women before and after 12 weeks of Nordic Walking (NW) training. Exerkines like myostatin, adiponectin, and osteocalcin have been shown to have several positive effects on metabolism. Thirty-six post-menopausal women (66 ± 5 years old, mean ± SD) were randomly assigned to a NW intervention group (n = 18; body mass, 68.8 ± 11.37 kg; fat, 23.43 ± 7.5 kg; free fat mass, 45.37 ± 5.92 kg) or a control group (n = 18; body mass, 68.34 ± 11.81 kg; fat, 23.61 ± 10.03 kg; free fat mass, 44.73 ± 3.9 kg). The training was performed three times a week for 12 weeks, with the intensity adjusted to 70% of the individual maximum ability. Before and one day after the 12-weeks intervention, performance indices were assessed using a senior fitness test. Blood samples (5 mL) were obtained from the participants between 7 and 8 AM, following an overnight fast, at baseline and one day immediately after the 12-week training program. A significant and large time × group interaction was observed for iron (NW: 98.6 ± 26.68 to 76.1 ± 15.31; CON: 100.6 ± 25.37 to 99.1 ± 27.2; p = 0.01; ηp2 = 0.21), myostatin (NW: 4.42 ± 1.97 to 3.83 ± 1.52; CON: 4.11 ± 0.95 to 4.84 ± 1.19; p = 0.00; ηp2 = 0.62), adiponectin (NW: 12.0 ± 9.46 to 14.6 ± 10.64; CON: 12.8 ± 8.99 to 11.9 ± 8.53; p = 0.00; ηp2 = 0.58), and osteocalcin (NW: 38.9 ± 26.04 to 41.6 ± 25.09; CON: 37.1 ± 33.2 to 37.2 ± 32.29; p = 0.03; ηp2 = 0.13). Furthermore, we have observed the correlations: basal ferritin levels were inversely correlated with changes in myostatin (r = −0.51, p = 0.05), change in adiponectin, and change in serum iron (r = −0.45, p = 0.05), basal iron, and osteocalcin after training (r = -0.55, p = 0.04). These findings indicate that iron modulates NW training-induced changes in exerkine levels.
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Kosaryan M, Rahimi M, Zamanfar D, Darvishi-Khezri H. Liver iron concentration is an independent risk factor for the prediabetic state in β-thalassemia patients. Int J Diabetes Dev Ctries 2020. [DOI: 10.1007/s13410-019-00789-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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Kosacka J, Woidt K, Toyka KV, Paeschke S, Klöting N, Bechmann I, Blüher M, Thiery J, Ossmann S, Baum P, Nowicki M. The role of dietary non-heme iron load and peripheral nerve inflammation in the development of peripheral neuropathy (PN) in obese non-diabetic leptin-deficient ob/ob mice. Neurol Res 2019; 41:341-353. [DOI: 10.1080/01616412.2018.1564191] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Joanna Kosacka
- Department of Neurology, University of Leipzig, Leipzig, Germany
| | - Katrin Woidt
- Institute of Anatomy, University of Leipzig, Leipzig, Germany
| | - Klaus V. Toyka
- Department of Neurology, University of Würzburg, Würzburg, Germany
| | - Sabine Paeschke
- Institute of Anatomy, University of Leipzig, Leipzig, Germany
| | - Nora Klöting
- Department of Medicine, University of Leipzig, Leipzig, Germany
- Integrated Research and Treatment Center (IFB) Adiposity Disease, Leipzig, Germany
| | - Ingo Bechmann
- Institute of Anatomy, University of Leipzig, Leipzig, Germany
| | - Matthias Blüher
- Department of Medicine, University of Leipzig, Leipzig, Germany
| | - Joachim Thiery
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics (ILM), University of Leipzig, Leipzig, German
| | | | - Petra Baum
- Department of Neurology, University of Leipzig, Leipzig, Germany
| | - Marcin Nowicki
- Institute of Anatomy, University of Leipzig, Leipzig, Germany
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Aregbesola A, de Mello VDF, Lindström J, Voutilainen S, Virtanen JK, Keinänen-Kiukaanniemi S, Tuomainen TP, Tuomilehto J, Uusitupa M. Serum adiponectin/Ferritin ratio in relation to the risk of type 2 diabetes and insulin sensitivity. Diabetes Res Clin Pract 2018; 141:264-274. [PMID: 29777745 DOI: 10.1016/j.diabres.2018.05.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 04/21/2018] [Accepted: 05/08/2018] [Indexed: 12/15/2022]
Abstract
AIMS Body iron inhibits the metabolism of adiponectin, an insulin sensitizing adipokine. We investigated the relationships of baseline and average of 4-year change in values of serum adiponectin (sA), serum ferritin (sF) and sA/sF ratio on type 2 diabetes (T2D) risk and insulin sensitivity (Matsuda ISI) and secretion (disposition index; DI30). METHODS Prospective analyses were conducted in participants with impaired glucose tolerance of the Finnish Diabetes Prevention Study (n = 516) recruited in 1993-1998. Cox and linear regression analyses were used to investigate the associations of sA, sF and sA/sF ratio, as continuous variables, with incident T2D, Matsuda ISI, and DI30. RESULTS During the mean follow-up of 8.2 years, 157 incident T2D cases occurred (intervention group, n = 65 and control group, n = 92). In adjusted models, baseline sA and sA/sF ratio were inversely associated with T2D risk (HR = 0.49, 95% CI 0.31-0.76, P = 0.002 and HR = 0.83, 95% CI 0.70-0.99, P = 0.044, respectively). Furthermore, a direct association was observed with Matsuda ISI (β=0.13, 95% CI 0.03-0.22, P = 0.009, for sA and β=0.04, 95% CI 0.01-0.07, P = 0.035, for sA/sF ratio) during the average 4-year follow-up. The changes in sA and sA/sF ratio were also inversely associated with T2D risk (HR = 0.36, 95% CI 0.20-0.63, P < 0.001 and HR = 0.76, 95% CI 0.62-0.92, P = 0.006, respectively), and directly with Matsuda ISI (β=0.27, 95% CI 0.17-0.38, P < 0.001, for sA and β=0.07, 95% CI 0.03-0.11, P < 0.001, for sA/sF ratio). No consistent associations were found with DI30. CONCLUSIONS: Baseline levels and changes during the follow-up in sA and sA/sF ratio are related to T2D risk and insulin sensitivity.
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Affiliation(s)
- Alex Aregbesola
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Yliopistonranta 1C, P.O. Box 1627, FI70211 Kuopio, Finland.
| | - Vanessa D F de Mello
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Yliopistonranta 1C, P.O. Box 1627, FI70211 Kuopio, Finland
| | - Jaana Lindström
- Diabetes Prevention Unit, National Institute for Health and Welfare, Helsinki, Finland
| | - Sari Voutilainen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Yliopistonranta 1C, P.O. Box 1627, FI70211 Kuopio, Finland
| | - Jyrki K Virtanen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Yliopistonranta 1C, P.O. Box 1627, FI70211 Kuopio, Finland
| | - Sirkka Keinänen-Kiukaanniemi
- Center for Life Course Health Research, University of Oulu, Finland; Medical Research Center and Unit of General Practice, Oulu University Hospital and Oulu Health Center, Oulu, Finland
| | - Tomi-Pekka Tuomainen
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Yliopistonranta 1C, P.O. Box 1627, FI70211 Kuopio, Finland
| | - Jaakko Tuomilehto
- Centre for Vascular Prevention, Danube-University Krems, Krems, Austria; Dasman Diabetes Institute, Dasman, Kuwait; Diabetes Research Group, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Matti Uusitupa
- Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Yliopistonranta 1C, P.O. Box 1627, FI70211 Kuopio, Finland
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Mao X, Chen H, Tang J, Wang L, Shu T. Hepcidin links gluco-toxicity to pancreatic beta cell dysfunction by inhibiting Pdx-1 expression. Endocr Connect 2017; 6:121-128. [PMID: 28179377 PMCID: PMC5424768 DOI: 10.1530/ec-16-0115] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 02/08/2017] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Gluco-toxicity is a term used to convey the detrimental effect of hyperglycemia on β-cell function through impaired insulin synthesis. Although it is known that the expression and activity of several key insulin transcription regulators is inhibited, other molecular mechanisms that mediate gluco-toxicity are poorly defined. Our objective was to explore the role of hepcidin in β-cell gluco-toxicity. DESIGN We first confirmed that high glucose levels inhibited hepcidin expression in the mouse insulinoma cell line, MIN6. The downregulation of hepcidin decreased Pdx-1 expression, which reduced insulin synthesis. METHODS MIN6 cells were exposed to high glucose concentrations (33.3 mmol/L). Glucose-stimulated insulin secretion (GSIS) and serum hepcidin levels were measured by ELISA. The mRNA levels of insulin1, insulin2, Pdx-1 and hepcidin were measured by real-time polymerase chain reaction. Western blot analysis was used to detect the changes in PDX-1 expression. Transient overexpression with hepcidin was used to reverse the downregulation of Pdx-1 and insulin synthesis induced by gluco-toxicity. RESULTS Exposure of MIN6 cells to high glucose significantly decreased GSIS and inhibited insulin synthesis as well as Pdx-1 transcriptional activity and expression at both the mRNA and protein levels. High glucose also decreased hepcidin expression and secretion. Hepcidin overexpression in MIN6 cells partially reversed the gluco-toxicity-induced downregulation of Pdx-1 and insulin expression and improved GSIS. The restoration of insulin synthesis by transfection of a hepcidin overexpression plasmid confirmed the role of hepcidin in mediating the gluco-toxic inhibition of insulin synthesis. CONCLUSIONS Our observations suggest that hepcidin is associated with gluco-toxicity-reduced pancreatic β-cell insulin synthesis in type 2 diabetes by inhibiting Pdx-1 expression.
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Affiliation(s)
- Xuhua Mao
- Department of Clinical LaboratoryYixing People's Hospital, Yixing, Wuxi, Jiangsu, China
| | - Hucheng Chen
- Department of Nuclear MedicineNanjing Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu, China
| | - Junmin Tang
- Department of Clinical LaboratoryYixing People's Hospital, Yixing, Wuxi, Jiangsu, China
| | - Liangliang Wang
- Department of NeurologyYixing People's Hospital Affiliated to Jiangsu University, Yixing, Wuxi, Jiangsu, China
| | - Tingting Shu
- Department of Central LaboratoryJiangsu Province Official Hospital, Nanjing, Jiangsu, China
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Kimura Y, Yasuda K, Kurotani K, Akter S, Kashino I, Hayabuchi H, Sato M, Mizoue T. Circulating ferritin concentrations are differentially associated with serum adipokine concentrations in Japanese men and premenopausal women. Eur J Nutr 2016; 56:2497-2505. [PMID: 27484685 DOI: 10.1007/s00394-016-1285-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2015] [Accepted: 07/26/2016] [Indexed: 12/17/2022]
Abstract
PURPOSE Increased iron storage, as measured by circulating ferritin, has been linked to an increased risk of various diseases including diabetes. We examined the association of circulating ferritin with serum adiponectin, leptin, resistin, plasminogen activator inhibitor-1 (PAI-1), and visfatin levels. METHODS We conducted a cross-sectional study among 429 Japanese employees (284 men and 145 premenopausal women, mean age: 42.5 ± 10.5 years). Serum adipokines were measured using Luminex suspension bead-based multiplexed array, and serum ferritin was determined using a chemiluminescence immunoassay. Multivariable regression analysis was performed to calculate mean concentrations of adipokine according to the tertile of ferritin concentrations with adjustment for potential confounders. RESULTS Leptin and visfatin concentrations increased with increasing ferritin concentrations in men after multivariable adjustment of physical activity, smoking, alcohol use, and body mass index (P for trend = 0.02 and 0.01 for leptin and visfatin, respectively). Serum ferritin concentrations were inversely and significantly associated with adiponectin in women (P for trend = 0.01). Resistin and PAI-1 were not appreciably associated with ferritin concentration. CONCLUSIONS Increased iron storage may be associated with higher circulating concentrations of leptin and visfatin in men and with lower concentrations of adiponectin in women.
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Affiliation(s)
- Yasumi Kimura
- Department of Nutritional Sciences, Faculty of Nutritional Sciences, Nakamura Gakuen University, 5-7-1 Befu, Jounan-Ku, Fukuoka, 814-0104, Japan.
| | - Kazuki Yasuda
- Department of Metabolic Disorder, Diabetes Research Center, National Center for Global Health and Medicine, Tokyo, Japan
| | - Kayo Kurotani
- Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan
| | - Shamima Akter
- Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan
| | - Ikuko Kashino
- Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan
| | - Hitomi Hayabuchi
- Graduate School of Nutrition and Health Science, Fukuoka Women's University, Fukuoka, Japan
| | - Masao Sato
- Laboratory of Nutrition Chemistry, Department of Bioscience and Biotechnology, Faculty of Agriculture, Graduate School, Kyushu University, Fukuoka, Japan
| | - Tetsuya Mizoue
- Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan
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Ko PC, Huang SY, Hsieh CH, Hsu MI, Hsu CS. Serum ferritin levels and polycystic ovary syndrome in obese and nonobese women. Taiwan J Obstet Gynecol 2016; 54:403-7. [PMID: 26384059 DOI: 10.1016/j.tjog.2014.06.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/04/2014] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVE The aim of this study is to evaluate serum ferritin levels and polycystic ovary syndrome (PCOS)-related complications in obese and nonobese women. MATERIALS AND METHODS This retrospective study included 539 (286 with PCOS and 253 without PCOS). RESULTS Serum ferritin correlated with menstrual cycle length, sex hormone-binding globulin, total testosterone, androstenedione, triglyceride, and total cholesterol in both obese and nonobese women. Obese women with high ferritin levels exhibited higher insulin resistance, impaired glucose tolerance, and liver enzymes (glutamic oxaloacetic transaminase, glutamic pyruvic transaminase) than obese women with low ferritin levels. However, among nonobese women, insulin resistance and risk of diabetes were not significantly different between the high and low ferritin groups. Independent of obesity, hypertriglyceridemia was the major metabolic disturbance observed in women with elevated serum ferritin levels. CONCLUSION Elevated serum ferritin levels are associated with increased insulin resistance and risk of diabetes in obese women but not in nonobese women. However, higher serum ferritin levels were correlated with a greater risk of hyperglyceridemia in both obese and nonobese women. Therefore, hypertriglyceridemia in women with PCOS might be associated with iron metabolism.
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Affiliation(s)
- Po-Chun Ko
- Department of Obstetrics and Gynaecology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Shih-Yi Huang
- School of Nutrition and Health Sciences, College of Public Health and Nutrition, Taipei Medical University, Taipei, Taiwan
| | - Ching-Hung Hsieh
- Department of Obstetrics and Gynecology, Clinic of Fu Jen Catholic University, Taipei, Taiwan
| | - Ming-I Hsu
- Department of Obstetrics and Gynaecology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.
| | - Chun-Sen Hsu
- Department of Obstetrics and Gynaecology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
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13
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Baum P, Kosacka J, Estrela-Lopis I, Woidt K, Serke H, Paeschke S, Stockinger M, Klöting N, Blüher M, Dorn M, Classen J, Thiery J, Bechmann I, Toyka KV, Nowicki M. The role of nerve inflammation and exogenous iron load in experimental peripheral diabetic neuropathy (PDN). Metabolism 2016; 65:391-405. [PMID: 26975531 DOI: 10.1016/j.metabol.2015.11.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 10/26/2015] [Accepted: 11/04/2015] [Indexed: 12/11/2022]
Abstract
BACKGROUND Iron is an essential but potentially toxic metal in mammals. Here we investigated a pathogenic role of exogenous iron in peripheral diabetic neuropathy (PDN) in an animal model for type 1 diabetes. METHODS Diabetes was induced by a single injection of streptozotocin (STZ) in 4-month-old Sprague-Dawley rats. STZ-diabetic rats and non-diabetic rats were fed with high, standard, or low iron diet. After three months of feeding, animals were tested. RESULTS STZ-rats on standard iron diet showed overt diabetes, slowed motor nerve conduction, marked degeneration of distal intraepidermal nerve fibers, mild intraneural infiltration with macrophages and T-cells in the sciatic nerve, and increased iron levels in serum and dorsal root ganglion (DRG) neurons. While motor fibers were afflicted in all STZ-groups, only a low iron-diet led also to reduced sensory conduction velocities in the sciatic nerve. In addition, only STZ-rats on a low iron diet showed damaged mitochondria in numerous DRG neurons, a more profound intraepidermal nerve fiber degeneration indicating small fiber neuropathy, and even more inflammatory cells in sciatic nerves than seen in any other experimental group. CONCLUSIONS These results indicate that dietary iron-deficiency rather than iron overload, and mild inflammation may both promote neuropathy in STZ-induced experimental PDN.
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Affiliation(s)
- Petra Baum
- Department of Neurology, University Hospital Leipzig, Liebigstr. 20, D-04103 Leipzig, Germany
| | - Joanna Kosacka
- Department of Medicine, University of Leipzig, Liebigstr. 21, D-04103 Leipzig, Germany
| | - Irina Estrela-Lopis
- Institute of Medical Physics and Biophysics, University of Leipzig, Härtelstr. 16-18, D-04107 Leipzig, Germany
| | - Katrin Woidt
- Institute of Anatomy, University of Leipzig, Liebigstr. 13, D-04103 Leipzig, Germany
| | - Heike Serke
- Institute of Anatomy, University of Leipzig, Liebigstr. 13, D-04103 Leipzig, Germany
| | - Sabine Paeschke
- Department of Medicine, University of Leipzig, Liebigstr. 21, D-04103 Leipzig, Germany
| | - Maximilian Stockinger
- Department of Neurology, University Hospital Leipzig, Liebigstr. 20, D-04103 Leipzig, Germany
| | - Nora Klöting
- Department of Medicine, University of Leipzig, Liebigstr. 21, D-04103 Leipzig, Germany; Integrated Research and Treatment Center (IFB) Adiposity Disease, Liebigstr. 21, D-04103 Leipzig, Germany
| | - Matthias Blüher
- Department of Medicine, University of Leipzig, Liebigstr. 21, D-04103 Leipzig, Germany
| | - Marco Dorn
- Institute of Medical Physics and Biophysics, University of Leipzig, Härtelstr. 16-18, D-04107 Leipzig, Germany
| | - Joseph Classen
- Department of Neurology, University Hospital Leipzig, Liebigstr. 20, D-04103 Leipzig, Germany
| | - Joachim Thiery
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics (ILM), University of Leipzig, Liebigstr. 27, D-04103 Leipzig, Germany
| | - Ingo Bechmann
- Institute of Anatomy, University of Leipzig, Liebigstr. 13, D-04103 Leipzig, Germany
| | - Klaus V Toyka
- Department of Neurology, University of Würzburg, Josef-Schneider-Str. 11, D-97080 Würzburg, Germany
| | - Marcin Nowicki
- Institute of Anatomy, University of Leipzig, Liebigstr. 13, D-04103 Leipzig, Germany.
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14
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Yamano N, Ikeda Y, Sakama M, Izawa-Ishizawa Y, Kihira Y, Ishizawa K, Miyamoto L, Tomita S, Tsuchiya K, Tamaki T. A long-term high-fat diet changes iron distribution in the body, increasing iron accumulation specifically in the mouse spleen. J Nutr Sci Vitaminol (Tokyo) 2016; 61:20-7. [PMID: 25994136 DOI: 10.3177/jnsv.61.20] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Although iron is an essential trace metal, its presence in excess causes oxidative stress in the human body. Recent studies have indicated that iron storage is a risk factor for type 2 diabetes mellitus. Dietary iron restriction or iron chelation ameliorates symptoms of type 2 diabetes in mouse models. However, whether iron content in the body changes with the development of diabetes is unknown. Here, we investigated the dynamics of iron accumulation and changes in iron absorption-related genes in mice that developed obesity and diabetes by consuming a high-fat diet (HFD-fed mice). HFD-fed mice (18-20 wk) were compared with control mice for hematologic features, serum ferritin levels, and iron contents in the gastrocnemius muscle, heart, epididymal fat, testis, liver, duodenum, and spleen. In addition, the spleen was examined histologically. Iron absorption-related gene expression in the liver and duodenum was also examined. Hemoglobin and serum ferritin levels were increased in HFD-fed mice. The HFD-fed mice showed iron accumulation in the spleen, but not in the heart or liver. Increased percentages of the splenic red pulp and macrophages were observed in HFD-fed mice and iron accumulation in the spleen was found mainly in the splenic red pulp. The HFD-fed mice also showed decreased iron content in the duodenum. The mRNA expression of divalent metal transporter-1 (DMT-1), an iron absorption-related gene, was elevated in the duodenum of HFD-fed mice. These results indicate that iron accumulation (specifically accumulation in the spleen) is enhanced by the development of type 2 diabetes induced by HFD.
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Affiliation(s)
- Noriko Yamano
- Department of Pharmacology, Institute of Health Biosciences, The University of Tokushima Graduate School
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15
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Baldwin HJ, Green AE, Spellar KM, Arthur PJ, Phillips HG, Patel JV. Tipping the balance: Haemoglobinopathies and the risk of diabetes. World J Diabetes 2016; 7:8-13. [PMID: 26788262 PMCID: PMC4707301 DOI: 10.4239/wjd.v7.i1.8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 10/08/2015] [Accepted: 12/02/2015] [Indexed: 02/05/2023] Open
Abstract
AIM: To establish a link between the risk of diabetes with haemoglobinopathies by examining available evidence of the effects of iron and blood glucose homeostasis from molecular to epidemiological perspectives.
METHODS: A systematic literature search was performed using electronic literature databases using various search terms. The International Diabetes Federation World Atlas was used to generate a list of populations with high rates of diabetes. PubMed, Scopus and Google Scholar were used to identify which of these populations also had a reported prevalence of haemoglobin abnormalities.
RESULTS: Abnormalities in iron homeostasis leads to increases in reactive oxygen species in the blood. This promotes oxidative stress which contributes to peripheral resistance to insulin in two ways: (1) reduced insulin/insulin receptor interaction; and (2) β-cell dysfunction. Hepcidin is crucial in terms of maintaining appropriate amounts of iron in the body and is in turn affected by haemoglobinopathies. Hepcidin also has other metabolic effects in places such as the liver but so far the extent of these is not well understood. It does however directly control the levels of serum ferritin. High serum ferritin is found in obese patients and those with diabetes and a meta-analysis of the various studies shows that high serum ferritin does indeed increase diabetes risk.
CONCLUSION: From an epidemiological standpoint, it is plausible that the well-documented protective effects of haemoglobinopathies with regard to malaria may have also offered other evolutionary advantages. By contributing to peripheral insulin resistance, haemoglobinopathies may have helped to sculpt the so-called “thrifty genotype”, which hypothetically is advantageous in times of famine. The prevalence data however is not extensive enough to provide concrete associations between diabetes and haemoglobinopathies - more precise studies are required.
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16
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Sobolesky PM, Harrell TS, Parry C, Venn-Watson S, Janech MG. Feeding a Modified Fish Diet to Bottlenose Dolphins Leads to an Increase in Serum Adiponectin and Sphingolipids. Front Endocrinol (Lausanne) 2016; 7:33. [PMID: 27148164 PMCID: PMC4838613 DOI: 10.3389/fendo.2016.00033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 04/08/2016] [Indexed: 01/16/2023] Open
Abstract
Feeding a modified fish diet has been suggested to improve insulin sensitivity in bottlenose dolphins; however, insulin sensitivity was not directly measured. Since demonstrating an improvement in insulin sensitivity is technically difficult in dolphins, we postulated that directional changes in the hormone axis: fibroblast growth factor 21 (FGF21)/Adiponectin/Ceramide (Cer), could provide further support to this hypothesis. We measured 2-h post-prandial serum FGF21, total adiponectin, percent unmodified adiponectin, ceramide, and sphingosine levels from dolphins fed a diet rich in heptadecanoic acid (C17:0) over 24 weeks. Serum FGF21 was quantified by ELISA with an observed range of 129-1599 pg/ml, but did not significantly change over the 24-week study period. Total adiponectin levels (mean ± SD) significantly increased from 776 ± 400 pmol/ml at week 0 to 1196 ± 467 pmol/ml at week 24. The percent unmodified adiponectin levels (mean ± SD) decreased from 23.8 ± 6.0% at week 0 to 15.2 ± 5.2% at week 24. Interestingly, although FGF21 levels did not change, there was a good correlation between FGF21 and total adiponectin (ρ = 0.788, P < 0.001). We quantified the abundances of serum ceramides and sphingosines (SPH) because adiponectin has a defined role in sphingolipid metabolism through adiponectin receptor-mediated activation of ceramidases. The most abundant ceramide in dolphin sera was Cer 24:1 comprising 49% of the ceramides measured. Significant reductions were observed in the unsaturated Cer 18:1, Cer 20:1, and Cer 24:1, whereas significant increases were observed in saturated Cer 22:0, Cer 24:0, and Cer 26:0. However, total serum ceramides did not change. Significant elevations were detected for total sphingosine, dihydrosphingosine, sphingosine-1-phosphate, and dihydrosphingosine-1-phosphate. Proteomic analysis of the serum proteins revealed few changes in serum proteins over the study period. In conclusion, shifting the dolphin diet to fishes rich in odd chain saturated fatty acids, such as C17:0, resulted in increased serum levels of the insulin sensitizing hormone adiponectin and serum SPH consistent with an insulin-sensitizing phenotype. It is still unclear whether FGF21 plays a role in the regulation of adiponectin in dolphins, similar to that shown in laboratory animal models.
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Affiliation(s)
- Philip M. Sobolesky
- Department of Medicine, Division of Nephrology, Medical University of South Carolina, Charleston, SC, USA
| | - Tyler S. Harrell
- Grice Marine Laboratory, Department of Biology, College of Charleston, Charleston, SC, USA
| | - Celeste Parry
- Translational Medicine and Research Program, National Marine Mammal Foundation, San Diego, CA, USA
| | - Stephanie Venn-Watson
- Translational Medicine and Research Program, National Marine Mammal Foundation, San Diego, CA, USA
| | - Michael G. Janech
- Department of Medicine, Division of Nephrology, Medical University of South Carolina, Charleston, SC, USA
- Grice Marine Laboratory, Department of Biology, College of Charleston, Charleston, SC, USA
- *Correspondence: Michael G. Janech,
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17
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Yalcin MM, Altinova AE, Akturk M, Gulbahar O, Arslan E, Ors Sendogan D, Yetkin I, Toruner FB. GDF-15 and Hepcidin Levels in Nonanemic Patients with Impaired Glucose Tolerance. J Diabetes Res 2016; 2016:1240843. [PMID: 27642607 PMCID: PMC5014962 DOI: 10.1155/2016/1240843] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 06/20/2016] [Accepted: 08/02/2016] [Indexed: 12/28/2022] Open
Abstract
Aims. Growth Differentiation Factor-15 (GDF-15) has been suggested as one of the regulators of hepcidin, an important regulatory peptide for iron deposition. Current data is conflicting about the relationship between hepcidin and disorders of glucose metabolism. We aimed to investigate serum hepcidin and GDF-15 concentrations and their associations with each other, in nonanemic subjects with impaired glucose tolerance (IGT) in comparison with the nonanemic subjects with normal glucose tolerance (NGT). Methods. Thirty-seven subjects with IGT and 32 control subjects with NGT, who were age-, gender-, and body mass index- (BMI-) matched, were included in the study. Results. Serum GDF-15 levels were significantly higher in IGT compared to NGT. There were no differences in hepcidin, interleukin-6, and high sensitive C-reactive protein levels between the groups. We found a positive correlation between GDF-15 and hepcidin levels. There were also positive correlations between GDF-15 and age, uric acid, creatinine, and area under the curve for glucose (AUC-G). Hepcidin was correlated positively with ferritin levels. In the multiple regression analysis, GDF-15 concentrations were independently associated with age, uric acid, and AUC-G. Conclusions. Impaired glucose tolerance is associated with increased GDF-15 levels even in the absence of anemia, but the levels of hepcidin are not significantly altered in prediabetic state.
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Affiliation(s)
- Mehmet Muhittin Yalcin
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
- *Mehmet Muhittin Yalcin:
| | - Alev Eroglu Altinova
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
| | - Mujde Akturk
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
| | - Ozlem Gulbahar
- Department of Biochemistry, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
| | - Emre Arslan
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
| | - Damla Ors Sendogan
- Department of Internal Medicine, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
| | - Ilhan Yetkin
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
| | - Fusun Balos Toruner
- Department of Endocrinology and Metabolism, Gazi University Faculty of Medicine, 06560 Ankara, Turkey
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18
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Suárez-Ortegón MF, Moreno M, Arbeláez A, Xifra G, Mosquera M, Moreno-Navarrete JM, Aguilar-de Plata C, Esteve E, Ricart W, Fernández-Real JM. Circulating hepcidin in type 2 diabetes: A multivariate analysis and double blind evaluation of metformin effects. Mol Nutr Food Res 2015; 59:2460-70. [PMID: 26394887 DOI: 10.1002/mnfr.201500310] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 09/02/2015] [Accepted: 09/04/2015] [Indexed: 12/13/2022]
Abstract
SCOPE Very few studies have evaluated serum hepcidin in patients with type 2 diabetes and they have reported conflicting results. In addition, the effect of antidiabetic drugs on circulating hepcidin has not been explored so far. The aims of the study were to evaluate hepcidin concentrations and hepcidin/ferritin ratio in type 2 diabetes subjects and healthy non-diabetic controls and to evaluate the effect of metformin on hepcidin concentrations. METHODS AND RESULTS Study 1: Cross-sectional multivariate study of 239 non-diabetic individuals and 65 people with type 2 diabetes. The multivariate analysis included covariates of chronic inflammation, BMI, pharmacological treatment, menopausal status and insulin resistance. Study 2: Randomized, double-blinded, placebo-controlled 4-month trial metformin compared to placebo among 36 type 2 diabetic patients. In both groups diet was controlled by maintaining a hypocaloric intake across the trial. Hepcidin levels were significantly lower in patients with type 2 diabetes than in non-diabetic individuals either in crude or adjusted regression models (P<0.05). Hepcidin decreased in both arms of the trial (Placebo, p = 0.004; metformin, p = 0.022). CONCLUSION Circulating hepcidin was significantly and independently lower in type 2 diabetes. Metformin treatment is not associated with reductions in hepcidin but hypocaloric diet could be involved.
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Affiliation(s)
- Milton Fabián Suárez-Ortegón
- Centre for Population Health Sciences, University of Edinburgh, Edinburgh, UK.,Nutrition Group, Universidad del Valle, Cali, Colombia
| | - María Moreno
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IdIBGi), CIBEROBN (CB06/03/010) and Instituto de Salud Carlos III (ISCIII), Girona, Spain
| | - Alejandra Arbeláez
- Nutrition Group, Universidad del Valle, Cali, Colombia.,Physiological Sciences Department, Universidad del Valle, Cali, Colombia
| | - Gemma Xifra
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IdIBGi), CIBEROBN (CB06/03/010) and Instituto de Salud Carlos III (ISCIII), Girona, Spain
| | - Mildrey Mosquera
- Nutrition Group, Universidad del Valle, Cali, Colombia.,Physiological Sciences Department, Universidad del Valle, Cali, Colombia
| | - José María Moreno-Navarrete
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IdIBGi), CIBEROBN (CB06/03/010) and Instituto de Salud Carlos III (ISCIII), Girona, Spain
| | - Cecilia Aguilar-de Plata
- Nutrition Group, Universidad del Valle, Cali, Colombia.,Physiological Sciences Department, Universidad del Valle, Cali, Colombia
| | - Eduardo Esteve
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IdIBGi), CIBEROBN (CB06/03/010) and Instituto de Salud Carlos III (ISCIII), Girona, Spain
| | - Wifredo Ricart
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IdIBGi), CIBEROBN (CB06/03/010) and Instituto de Salud Carlos III (ISCIII), Girona, Spain
| | - José Manuel Fernández-Real
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IdIBGi), CIBEROBN (CB06/03/010) and Instituto de Salud Carlos III (ISCIII), Girona, Spain
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19
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Aregbesola A, Voutilainen S, Virtanen JK, Aregbesola A, Tuomainen TP. Serum hepcidin concentrations and type 2 diabetes. World J Diabetes 2015; 6:978-982. [PMID: 26185605 PMCID: PMC4499531 DOI: 10.4239/wjd.v6.i7.978] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2014] [Revised: 12/22/2014] [Accepted: 03/20/2015] [Indexed: 02/05/2023] Open
Abstract
Hepcidin is a peptide hormone with both paracrine and endocrine functions that help in maintaining body iron stores. Type 2 diabetes (T2D) is one of the sequelae of excess body iron stores; thus, iron regulatory hormone hepcidin may have a direct or at least an indirect role in the aetiopathogenesis of T2D. Both human and animal studies at molecular and genetic levels have attempted to establish a role for hepcidin in the development of T2D, and a few epidemiologic studies have also showed a link between hepcidin and T2D at population level, but the findings are still inconclusive. Recent data have suggested different pathways in which hepcidin could be associated with T2D with much emphasis on its primary or secondary role in insulin resistance. Some of the suggested pathways are via transcription modulator of hepcidin (STAT3); ferroportin 1 expression on the cells involved in iron transport; transmembrane protease 6 enzyme; and pro-inflammatory cytokines, interleukin (IL)-1, IL-6, tumor necrosis factor-α and IL-10. This review briefly reports the existing evidence on the possible links between hepcidin and T2D and concludes that more data are needed to confirm or refute hepcidin’s role in the development of T2D. Examining this role could provide a further evidence base for iron in the aetiopathogenesis of T2D.
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20
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Aigner E, Weiss G, Datz C. Dysregulation of iron and copper homeostasis in nonalcoholic fatty liver. World J Hepatol 2015; 7:177-188. [PMID: 25729473 PMCID: PMC4342600 DOI: 10.4254/wjh.v7.i2.177] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 12/12/2014] [Accepted: 12/31/2014] [Indexed: 02/06/2023] Open
Abstract
Elevated iron stores as indicated by hyperferritinemia with normal or mildly elevated transferrin saturation and mostly mild hepatic iron deposition are a characteristic finding in subjects with non-alcoholic fatty liver disease (NAFLD). Excess iron is observed in approximately one third of NAFLD patients and is commonly referred to as the “dysmetabolic iron overload syndrome”. Clinical evidence suggests that elevated body iron stores aggravate the clinical course of NAFLD with regard to liver-related and extrahepatic disease complications which relates to the fact that excess iron catalyses the formation of toxic hydroxyl-radicals subsequently resulting in cellular damage. Iron removal improves insulin sensitivity, delays the onset of type 2 diabetes mellitus, improves pathologic liver function tests and likewise ameliorates NAFLD histology. Several mechanisms contribute to pathologic iron accumulation in NAFLD. These include impaired iron export from hepatocytes and mesenchymal Kupffer cells as a consequence of imbalances in the concentrations of iron regulatory factors, such as hepcidin, cytokines, copper or other dietary factors. This review summarizes the knowledge about iron homeostasis in NAFLD and the rationale for its therapeutic implications.
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21
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Park SK, Choi WJ, Oh CM, Kim MG, Ham WT, Choi JM, Ryoo JH. Clinical significance of serum ferritin level as an independent predictor of insulin resistance in Korean men. Diabetes Res Clin Pract 2015; 107:187-93. [PMID: 25438938 DOI: 10.1016/j.diabres.2014.08.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Revised: 07/23/2014] [Accepted: 08/29/2014] [Indexed: 12/27/2022]
Abstract
AIMS Elevated serum ferritin level has been reported to be associated with type 2 diabetes mellitus and metabolic syndrome, which have significant relation with insulin resistance (IR). However, clinical association between serum ferritin level and IR remained unclear. Accordingly, this study was designed to evaluate the longitudinal effects of baseline serum ferritin level on the development of IR. METHODS An IR-free 22,057 healthy Korean men (HOMA-IR<2.7), who had participated in a medical health check-up program in 2005, were followed up until 2010. During follow up, the development rate of IR, defined in case of HOMA-IR≥2.7, was monitored according to the quartile groups of serum ferritin levels. Cox proportional hazards models were used to measure the hazard ratios (HRs) of baseline serum ferritin levels on IR. RESULTS During 77,471.1 person-years of follow-up, 4494 incident cases of insulin resistance developed between 2006 and 2010 (overall development rate: 20.4%). The development rate of IR increased in proportion to the baseline serum ferritin levels (quartile 1: 16.7%, quartile 2: 18.5%, quartile 3: 19.9%, quartile 4: 25.5%, P<0.001). After adjusting for multiple covariates, the HRs (95% CI) for IR, comparing the second to the fourth quartile of serum ferritin levels with the first quartile, were 1.11 (0.99-1.24), 1.19 (1.07-1.33) and 1.51 (1.35-1.68), respectively (P for trend <0.001). CONCLUSIONS Elevated serum ferritin level was independently associated with the future development of IR in Korean men.
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Affiliation(s)
- Sung Keun Park
- Total Healthcare Center, Kangbuk Samsung Hospital, Sungkyunkwan University, School of Medicine, Seoul, Republic of Korea; Department of Preventive Medicine, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Won Joon Choi
- Department of Anesthesiology and Pain Medicine, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Republic of Korea
| | - Chang-Mo Oh
- The Korea Central Cancer Registry, National Cancer Center, Goyang, Republic of Korea
| | - Min-Gi Kim
- Department of Occupational and Environmental Medicine, Dongguk University, Gyeongju Hospital, Gyeongju, Republic of Korea
| | - Woo Taek Ham
- Department of Physical Education, Graduate School, Sangji University, Wonju, Republic of Korea
| | - Joong-Myung Choi
- Department of Preventive Medicine, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Jae-Hong Ryoo
- Department of Preventive Medicine, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
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22
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Wang H, Li H, Jiang X, Shi W, Shen Z, Li M. Hepcidin is directly regulated by insulin and plays an important role in iron overload in streptozotocin-induced diabetic rats. Diabetes 2014; 63:1506-18. [PMID: 24379355 DOI: 10.2337/db13-1195] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Iron overload is frequently observed in type 2 diabetes mellitus (DM2), but the underlying mechanisms remain unclear. We hypothesize that hepcidin may be directly regulated by insulin and play an important role in iron overload in DM2. We therefore examined the hepatic iron content, serum iron parameters, intestinal iron absorption, and liver hepcidin expression in rats treated with streptozotocin (STZ), which was given alone or after insulin resistance induced by a high-fat diet. The direct effect of insulin on hepcidin and its molecular mechanisms were furthermore determined in vitro in HepG2 cells. STZ administration caused a significant reduction in liver hepcidin level and a marked increase in intestinal iron absorption and serum and hepatic iron content. Insulin obviously upregulated hepcidin expression in HepG2 cells and enhanced signal transducer and activator of transcription 3 protein synthesis and DNA binding activity. The effect of insulin on hepcidin disappeared when the signal transducer and activator of transcription 3 pathway was blocked and could be partially inhibited by U0126. In conclusion, the current study suggests that hepcidin can be directly regulated by insulin, and the suppressed liver hepcidin synthesis may be an important reason for the iron overload in DM2.
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Affiliation(s)
- Heyang Wang
- Military Hygiene Department, Faculty of Naval Medicine, Second Military Medical University, Shanghai, China
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23
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Iwanaga S, Sakano N, Taketa K, Takahashi N, Wang DH, Takahashi H, Kubo M, Miyatake N, Ogino K. Comparison of serum ferritin and oxidative stress biomarkers between Japanese workers with and without metabolic syndrome. Obes Res Clin Pract 2014; 8:e201-98. [DOI: 10.1016/j.orcp.2013.01.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/18/2012] [Revised: 12/10/2012] [Accepted: 01/09/2013] [Indexed: 10/27/2022]
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24
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Westerink J, Olijhoek JK, Koppen A, Faber DR, Kalkhoven E, Monajemi H, van Asbeck BS, van der Graaf Y, Visseren FLJ. The relation between body iron stores and adipose tissue function in patients with manifest vascular disease. Eur J Clin Invest 2013; 43:1240-9. [PMID: 24245570 DOI: 10.1111/eci.12165] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Accepted: 08/21/2013] [Indexed: 01/28/2023]
Abstract
BACKGROUND We investigated whether plasma ferritin levels through the pro-inflammatory effects of free iron are associated with adipose tissue dysfunction in a relevant population of patients with manifest vascular disease who would potentially benefit the most from further aetiological insights. MATERIALS AND METHODS In a cohort of 355 patients with vascular diseases, the association between plasma ferritin and adiponectin levels was quantified using linear regression analysis. Interleukin-6 and adiponectin levels were measured in medium from pre-adipocytes and adipocytes after incubation with increasing concentrations of Fe(III)-citrate and after co-incubation with iron chelators or radical scavengers. RESULTS Increasing ferritin plasma concentrations were not related to plasma adiponectin levels in patients without (β -0·13; 95% CI -0·30 to 0·04) or with the metabolic syndrome (β -0·04; 95% CI -0·17 to 0·10). Similar results were found in patients who developed a new cardiovascular event in the follow-up period. In vitro, incubation with increasing concentrations of Fe(III)-citrate-induced inflammation in pre-adipocyte cultures as witnessed by increased IL-6 secretion at 30 μm Fe(III)-citrate vs. control (500 ± 98 pg/mL vs. 194 ± 31 pg/mL, P = 0·03). Co-incubation of pre-adipocytes with iron chelators or radical scavengers prevented this inflammatory response. Incubation of adipocytes with 30 μm Fe(III)-citrate did not influence adiponectin secretion compared with control. CONCLUSIONS In patients with vascular disease, there is no association between plasma ferritin and adiponectin levels. In vitro, free iron induces an inflammatory response in pre-adipocytes, but not in adipocytes. This response was blocked by co-incubation with iron chelators or radical scavengers. Adiponectin secretion by adipocytes was not influenced by free iron.
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Affiliation(s)
- Jan Westerink
- Department of Vascular Medicine, University Medical Center Utrecht, Utrecht, the Netherlands
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Aydin S, Celik O, Gurates B, Sahin I, Ulas M, Yilmaz M, Kalayci M, Kuloglu T, Catak Z, Aksoy A, Ozercan IH, Kumru S. Concentrations of preptin, salusins and hepcidins in plasma and milk of lactating women with or without gestational diabetes mellitus. Peptides 2013; 49:123-30. [PMID: 24060315 DOI: 10.1016/j.peptides.2013.09.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2013] [Revised: 09/09/2013] [Accepted: 09/09/2013] [Indexed: 12/21/2022]
Abstract
This study was undertaken to ascertain whether human milk contains preptin, salusin-alpha (salusin-α) and -beta (salusin-β) and pro-hepcidin and hepcidin-25, and whether there are relationships between plasma and milk preptin, salusin-α and -β and pro-hepcidin and hepcidin-25 concentrations in lactating mothers with and without gestational diabetes mellitus (GDM). Blood was obtained from non-lactating women (n = 12), non-diabetic lactating women (n = 12), and GDM lactating women (n = 12). Colostrum, transitional milk, and mature milk samples were collected just before suckling from healthy and GDM lactating women. Peptides concentrations were determined by ELISA and EIA. Mammary gland tissues were screened immunohistochemically for these peptides. Women with GDM had significantly higher plasma and colostum preptin concentrations than healthy lactating women during the colostral and transitional milk period. Salusin-alpha and -beta levels in milk and plasma were lower in women with GDM. Salusin-α and -β were significantly lower in both plasma and colostrums of GDM than of healthy lactating women. Women with GDM had significantly higher colostum prohepcidin and hepcidin-25 concentrations than healthy lactating women during the colostral period. Plasma prohepcidin was also higher in women with GDM than in healthy lactating women during the colostral period, but plasma prohepcidin and hepcidin-25 levels decreased during mature milk period. Transitional milk pro-hepcidin and hepcidin-25 levels in women with GDM were higher than in healthy lactating women. All these results revealed that the mammary gland produces those peptides, which were present in milk at levels correlating with plasma concentrations.
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Affiliation(s)
- Suleyman Aydin
- Department of Medical Biochemistry and Clinical Biochemistry (Firat Hormones Research Group), Medical School, Firat University, 23119 Elazig, Turkey.
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Adiponectin in inflammatory and immune-mediated diseases. Cytokine 2013; 64:1-10. [PMID: 23850004 DOI: 10.1016/j.cyto.2013.06.317] [Citation(s) in RCA: 123] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 05/31/2013] [Accepted: 06/16/2013] [Indexed: 01/03/2023]
Abstract
Circulating levels of adiponectin (APN) are reduced in obesity and associated comorbidities, with inflammation playing an important role in downregulating APN production. In contrast to obesity and metabolic disease, elevated systemic and local levels of APN are present in patients with inflammatory and immune-mediated diseases, including autoimmune and pulmonary conditions, heart and kidney failure, viral hepatitis, organ transplantation and perhaps critical illness. A positive association between inflammation and APN is usually reported in inflammatory/immune pathologies, in contrast with the negative correlation typical of metabolic disease. This review discusses the role of APN in modulation of inflammation and immunity and the potential mechanisms leading to increased levels of APN in inflammatory/immune diseases, including modification of adipose tissue physiology; relative contribution of different tissues and adipose depots; hormonal, pharmacological, nutritional and life style factors; the potential contribution of the microbiota as well as the role of altered APN clearance and release from T-cadherin-associated tissue reservoirs. Potential reasons for some of the apparently contradictory findings on the role of APN as a modulator of immunity and inflammation are also discussed, including a comparison of types of recombinant APN used for in vitro studies and strain-dependent differences in the phenotype of APN KO mice.
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Associations between serum hepcidin, ferritin and Hb concentrations and type 2 diabetes risks in a Han Chinese population. Br J Nutr 2013; 110:2180-5. [DOI: 10.1017/s0007114513001827] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Systemic Fe overload can contribute to abnormal glucose metabolism and the onset of type 2 diabetes (T2D). Although hepcidin is the master regulator of systemic Fe homeostasis, few studies have systematically evaluated the associations of serum hepcidin concentrations with Fe metabolism parameters and risks for the development of T2D. In this regard, whether hepcidin concentrations are associated with T2D remains controversial. We measured serum hepcidin and ferritin concentrations in a case–control study of 1259 Han Chinese participants to evaluate the possible associations of serum hepcidin concentrations with Fe metabolism parameters and risks of T2D. Individuals with diabetes (n 555) and control participants (n 704) were recruited and serum hepcidin and ferritin concentrations were quantified. Additionally, selected biochemical and anthropometric variables were determined. A logistic regression analysis was performed to evaluate the association of serum hepcidin and ferritin concentrations with T2D. A linear regression analysis was used to test for associations between serum hepcidin and ferritin concentrations and a number of clinical, demographic and diabetes-associated variables. We found that serum hepcidin concentrations correlated with Hb and serum ferritin concentrations. No differences in hepcidin concentrations were found between the group with diabetes and the control group. Hepcidin concentrations were not significantly correlated with T2D risk factors. We also found that serum ferritin concentrations were elevated in individuals with diabetes and were positively correlated with both Hb concentrations and T2D risk factors. The present findings suggest that serum ferritin concentrations correlate with T2D risk factors, while serum hepcidin concentrations are positively associated with Hb and serum ferritin concentrations, but do not correlate with T2D.
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A POTENTIAL LINK BETWEEN INSULIN RESISTANCE AND IRON OVERLOAD DISORDER IN BROWSING RHINOCEROSES INVESTIGATED THROUGH THE USE OF AN EQUINE MODEL. J Zoo Wildl Med 2012; 43:S61-5. [DOI: 10.1638/2011-0145.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Zhao Z, Li S, Liu G, Yan F, Ma X, Huang Z, Tian H. Body iron stores and heme-iron intake in relation to risk of type 2 diabetes: a systematic review and meta-analysis. PLoS One 2012; 7:e41641. [PMID: 22848554 PMCID: PMC3406072 DOI: 10.1371/journal.pone.0041641] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 06/24/2012] [Indexed: 02/05/2023] Open
Abstract
Background and Objective Emerging evidence from biological and epidemiological studies has suggested that body iron stores and heme-iron intake may be related to the risk of type 2 diabetes (T2D). We aimed to examine the association of body iron stores and heme-iron intake with T2D risk by conducting a systematic review and meta-analysis of previously published studies. Research Design and Methods Systematic review and subsequent meta-analysis were conducted by searching MEDLINE database up to June 22, 2012 to identify studies that analyzed the association of body iron stores or dietary heme-iron intake with T2D risk. The meta-analysis was performed using the effect estimates and 95% confidence intervals (CIs) to calculate the pooled risk estimates, while the heterogeneity among studies was examined using the I2 and Q statistic. Results The meta-analysis included 16 high-quality studies: 12 studies analyzed ferritin levels (4,366 T2D patients and 41,091 controls) and 4 measured heme-iron intake (9,246 T2D patients and 179,689 controls). The combined relative risk (RR) comparing the highest and lowest category of ferritin levels was 1.66 (95% CI: 1.15–2.39) for prospective studies, 2.29 (95% CI: 1.48–3.54) for cross-sectional studies with heterogeneity (Q = 14.84, p = 0.01, I2 = 66.3%; Q = 44.16, p<0.001, I2 = 88.7%). The combined RR comparing the highest and lowest category of heme-iron intake was 1.31 (95% CI: 1.21–1.43) with heterogeneity (Q = 1.39, p = 0.71, I2 = 0%). No publication bias was found. Additional 15 studies that were of good quality, had significant results, and analyzed the association between body iron stores and T2D risk were qualitatively included in the systematic review. Conclusions The meta-analysis and systematic review suggest that increased ferritin levels and heme-iron intake are both associated with higher risk of T2D.
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Affiliation(s)
- Zhuoxian Zhao
- Department of Endocrinology and Metabolism, Sichuan University, West China Hospital, Chengdu, China
| | - Sheyu Li
- Department of Endocrinology and Metabolism, Sichuan University, West China Hospital, Chengdu, China
| | - Guanjian Liu
- Chinese Evidence-Based Medicine/Cochrane Center, Chengdu, China
| | - Fangfang Yan
- Department of Endocrinology and Metabolism, Sichuan University, West China Hospital, Chengdu, China
| | - Xuelei Ma
- Department of Oncology, State Key Laboratory of Biotherapy and Cancer Center, West China Medical School, Sichuan University, West China Hospital, Chengdu, China
| | - Zeyu Huang
- Department of Orthopedics, Sichuan University, West China Hospital, Chengdu, China
| | - Haoming Tian
- Department of Endocrinology and Metabolism, Sichuan University, West China Hospital, Chengdu, China
- * E-mail:
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Is hemojuvelin a possible new player in iron metabolism in hemodialysis patients? Int Urol Nephrol 2011; 44:1805-11. [PMID: 22130959 PMCID: PMC3510395 DOI: 10.1007/s11255-011-0084-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Accepted: 10/27/2011] [Indexed: 12/16/2022]
Abstract
Introduction Hemojuvelin (HJV) is highly expressed in the liver, skeletal muscles, and heart, seems to play a role in iron absorption and release from cells, and has anti-inflammatory properties. Moreover, HJV plays an essential role in the regulation of hepcidin expression, specifically in the iron-sensing pathway. Hepcidin has emerged as a key regulator of iron homeostasis. In this study we tested for the first time the hypothesis that HJV is related to iron metabolism in hemodialysis (HD) patients. Methods Iron status, complete blood count, and serum creatinine, albumin, and lipids were assessed, using standard laboratory methods. Serum levels of soluble transferrin receptor (sTFR), high-sensitivity CRP, IL-6, hepcidin, and HJV were measured using commercially available kits. Results Serum HJV, hepcidin, ferritin, IL-6, hsCRP, and serum creatinine were significantly higher (all P < 0.001), whereas serum iron, sTFR, transferrin, hemoglobin, and erythrocyte count were significantly lower in HD patients, compared to healthy volunteers (all P < 0.001). In univariate analysis, HJV was strongly correlated (P < 0.001) with ferritin, transferrin saturation, and TIBC, as well as with hsCRP, hepcidin, Kt/V (P < 0.01) and residual renal function, the presence of diabetes, APKD, and coronary heart disease. Predictors of HJV level in multiple regression analysis were ferritin (beta value was 0.50, P = 0.00004) and transferrin saturation (beta value was 0.47, P = 0.0002), explaining 81% of the HJV variations. Conclusions Serum HJV is elevated in HD patients and related predominantly to kidney function and iron metabolism. However, HJV is probably not correlated to inflammation. HJV appears to be a new player in iron metabolism in these patients.
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Iron in fatty liver and in the metabolic syndrome: a promising therapeutic target. J Hepatol 2011; 55:920-32. [PMID: 21718726 DOI: 10.1016/j.jhep.2011.05.008] [Citation(s) in RCA: 240] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 05/29/2011] [Accepted: 05/31/2011] [Indexed: 12/17/2022]
Abstract
The dysmetabolic iron overload syndrome (DIOS) is now a frequent finding in the general population, as is detected in about one third of patients with nonalcoholic fatty liver disease (NAFLD) and the metabolic syndrome. The pathogenesis is related to altered regulation of iron transport associated with steatosis, insulin resistance, and subclinical inflammation, often in the presence of predisposing genetic factors. Evidence is accumulating that excessive body iron plays a causal role in insulin resistance through still undefined mechanisms that probably involve a reduced ability to burn carbohydrates and altered function of adipose tissue. Furthermore, DIOS may facilitate the evolution to type 2 diabetes by altering beta-cell function, the progression of cardiovascular disease by contributing to the recruitment and activation of macrophages within arterial lesions, and the natural history of liver disease by inducing oxidative stress in hepatocytes, activation of hepatic stellate cells, and malignant transformation by promotion of cell growth and DNA damage. Based on these premises, the association among DIOS, metabolic syndrome, and NAFLD is being investigated as a new risk factor to predict the development of overt cardiovascular and hepatic diseases, and possibly hepatocellular carcinoma, but most importantly, represents also a treatable condition. Indeed, iron depletion, most frequently achieved by phlebotomy, has been shown to decrease metabolic alterations and liver enzymes in controlled studies in NAFLD. Additional studies are warranted to evaluate the potential of iron reductive therapy on hard clinical outcomes in patients with DIOS.
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Lee BK, Kim Y, Kim YI. Association of serum ferritin with metabolic syndrome and diabetes mellitus in the South Korean general population according to the Korean National Health and Nutrition Examination Survey 2008. Metabolism 2011; 60:1416-24. [PMID: 21489582 DOI: 10.1016/j.metabol.2011.02.008] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Revised: 02/14/2011] [Accepted: 02/15/2011] [Indexed: 12/28/2022]
Abstract
We examined the association of serum ferritin levels with metabolic syndrome (MS) and diabetes mellitus in a representative sample of the adult South Korean population using data from the 2008 Korean National Health and Nutrition Examination Survey. We conducted a cross-sectional study of 6311 adults older than 20 years who participated in the 2008 Korean National Health and Nutrition Examination Survey. Metabolic syndrome was defined as the presence of at least 3 of the following: elevated blood pressure, low high-density lipoprotein cholesterol, elevated serum triglycerides, elevated plasma glucose, and abdominal obesity. Diabetes mellitus was defined as fasting glucose of at least 126 mg/dL. Insulin resistance was determined using the homeostasis model assessment estimate of insulin resistance. In a representative sample of the adult Korean population, MS was more prevalent in the highest quartile compared with the lowest quartile of serum ferritin concentrations in women following adjustments for age, education, smoking, alcohol intake, body mass index, aspartate aminotransferase, and alanine aminotransferase. Diabetes mellitus was more prevalent in the highest quartile compared with the lowest quartile of serum ferritin concentrations in premenopausal women and men. The geometric means of fasting insulin and insulin resistance determined using the homeostasis model assessment of insulin resistance in the fourth serum ferritin quartiles of postmenopausal women and men were significantly higher compared with those in the first quartile of the respective groups. The present study demonstrates that elevated serum ferritin concentrations are associated with an increased risk of MS and diabetes mellitus in a representative sample of the adult South Korean population.
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Affiliation(s)
- Byung-Kook Lee
- Institute of Environmental & Occupational Medicine, Soonchunhyang University 646 Eupnae-ri, Shinchang-myun, Asan-si, Choongnam 336-745, South Korea
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The many faces of the octahedral ferritin protein. Biometals 2011; 24:489-500. [PMID: 21267633 DOI: 10.1007/s10534-011-9415-8] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Accepted: 01/13/2011] [Indexed: 12/14/2022]
Abstract
Iron is an essential trace nutrient required for the active sites of many enzymes, electron transfer and oxygen transport proteins. In contrast, to its important biological roles, iron is a catalyst for reactive oxygen species (ROS). Organisms must acquire iron but must protect against oxidative damage. Biology has evolved siderophores, hormones, membrane transporters, and iron transport and storage proteins to acquire sufficient iron but maintain iron levels at safe concentrations that prevent iron from catalyzing the formation of ROS. Ferritin is an important hub for iron metabolism because it sequesters iron during times of iron excess and releases iron during iron paucity. Ferritin is expressed in response to oxidative stress and is secreted into the extracellular matrix and into the serum. The iron sequestering ability of ferritin is believed to be the source of the anti-oxidant properties of ferritin. In fact, ferritin has been used as a biomarker for disease because it is synthesized in response to oxidative damage and inflammation. The function of serum ferritin is poorly understood, however serum ferritin concentrations seem to correlate with total iron stores. Under certain conditions, ferritin is also associated with pro-oxidant activity. The source of this switch from anti-oxidant to pro-oxidant has not been established but may be associated with unregulated iron release from ferritin. Recent reports demonstrate that ferritin is involved in other aspects of biology such as cell activation, development, immunity and angiogenesis. This review examines ferritin expression and secretion in correlation with anti-oxidant activity and with respect to these new functions. In addition, conditions that lead to pro-oxidant conditions are considered.
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