1
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Koç NS, Yeter H, Yıldırım T, Erdem Y, Yılmaz R. Effect of medium cut-off membranes on Pentosidine and N-(carboxymethyl) lysine levels in uncontrolled diabetic hemodialysis patients. Ther Apher Dial 2024. [PMID: 38572624 DOI: 10.1111/1744-9987.14126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 02/24/2024] [Accepted: 02/29/2024] [Indexed: 04/05/2024]
Abstract
INTRODUCTION Patients on hemodialysis, especially with diabetes, face elevated cardiovascular events. A major contributor to complications associated with diabetes is advanced glycation end products (AGEs). Removing these compounds is challenging in traditional hemodialysis. Medium-cut-off (MCO) membranes potentially remove toxins without significant albumin loss. This study explored how MCO membranes impact AGEs levels in uncontrolled diabetic patients undergoing hemodialysis. METHODS Sixteen patients received MCO membrane dialysis, while others used high-flux (HF) membranes. After 12 sessions, the dialyzers were switched, totaling 24 sessions. Blood samples at trial initiation (T0), session 12 (T1) and session 24 (T2) tested for CML, Pentosidine, laboratory parameters. RESULTS Switching dialyzers showed increased albumin with MCO-to-HF and decreased with HF-to-MCO, albeit nonsignificant (p = 0.5/p = 0.1). Patients on MCO had lower albumin levels than HF (p = 0.03/p = 0.6, respectively). Hemodialysis with MCO demonstrated lower levels of CML/Pentosidine compared to HF (p = 0.09/p = 0.9 for CML; p = 0.04/p = 0.3 for Pentosidine). Transitioning to HF led to elevated levels (p = 0.4/p = 0.09 for CML; p = 0.3/p = 0.07 for Pentosidine). CONCLUSION MCO dialysis in diabetic individuals notably reduces AGE levels.
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Affiliation(s)
- Neriman Sıla Koç
- Faculty of Medicine, Department of Internal Medicine, Division of Nephrology, Harran University, Şanlıurfa, Turkey
| | - Hasan Yeter
- Faculty of Medicine, Department of Internal Medicine, Division of Nephrology, Hacettepe University, Ankara, Turkey
| | - Tolga Yıldırım
- Faculty of Medicine, Department of Internal Medicine, Division of Nephrology, Hacettepe University, Ankara, Turkey
| | - Yunus Erdem
- Faculty of Medicine, Department of Internal Medicine, Division of Nephrology, Hacettepe University, Ankara, Turkey
| | - Rahmi Yılmaz
- Faculty of Medicine, Department of Internal Medicine, Division of Nephrology, Hacettepe University, Ankara, Turkey
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Rosu LM, Prodan-Bărbulescu C, Maghiari AL, Bernad ES, Bernad RL, Iacob R, Stoicescu ER, Borozan F, Ghenciu LA. Current Trends in Diagnosis and Treatment Approach of Diabetic Retinopathy during Pregnancy: A Narrative Review. Diagnostics (Basel) 2024; 14:369. [PMID: 38396408 PMCID: PMC10887682 DOI: 10.3390/diagnostics14040369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
Diabetes mellitus during pregnancy and gestational diabetes are major concerns worldwide. These conditions may lead to the development of severe diabetic retinopathy during pregnancy or worsen pre-existing cases. Gestational diabetes also increases the risk of diabetes for both the mother and the fetus in the future. Understanding the prevalence, evaluating risk factors contributing to pathogenesis, and identifying treatment challenges related to diabetic retinopathy in expectant mothers are all of utmost importance. Pregnancy-related physiological changes, including those in metabolism, blood flow, immunity, and hormones, can contribute to the development or worsening of diabetic retinopathy. If left untreated, this condition may eventually result in irreversible vision loss. Treatment options such as laser therapy, intravitreal anti-vascular endothelial growth factor drugs, and intravitreal steroids pose challenges in managing these patients without endangering the developing baby and mother. This narrative review describes the management of diabetic retinopathy during pregnancy, highlights its risk factors, pathophysiology, and diagnostic methods, and offers recommendations based on findings from previous literature.
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Affiliation(s)
- Luminioara M. Rosu
- Department of Anatomy and Embryology, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania; (L.M.R.); (A.L.M.); (R.I.); (F.B.)
| | - Cătălin Prodan-Bărbulescu
- Department of Anatomy and Embryology, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania; (L.M.R.); (A.L.M.); (R.I.); (F.B.)
| | - Anca Laura Maghiari
- Department of Anatomy and Embryology, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania; (L.M.R.); (A.L.M.); (R.I.); (F.B.)
| | - Elena S. Bernad
- Department of Obstetrics and Gynecology, Victor Babeș University of Medicine and Pharmacy, 300041 Timisoara, Romania;
- Clinic of Obstetrics and Gynecology, “Pius Brinzeu” County Clinical Emergency Hospital, 300723 Timisoara, Romania
- Center for Laparoscopy, Laparoscopic Surgery and In Vitro Fertilization, Victor Babeș University of Medicine and Pharmacy, 300041 Timisoara, Romania
- Department of Automatic Control and Applied Informatics, Politehnica University, 300223 Timisoara, Romania;
| | - Robert L. Bernad
- Department of Automatic Control and Applied Informatics, Politehnica University, 300223 Timisoara, Romania;
| | - Roxana Iacob
- Department of Anatomy and Embryology, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania; (L.M.R.); (A.L.M.); (R.I.); (F.B.)
- Discipline of Radiology and Medical Imaging, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania;
| | - Emil Robert Stoicescu
- Discipline of Radiology and Medical Imaging, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania;
- Research Center for Pharmaco-Toxicological Evaluations, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania
| | - Florina Borozan
- Department of Anatomy and Embryology, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania; (L.M.R.); (A.L.M.); (R.I.); (F.B.)
| | - Laura Andreea Ghenciu
- Department of Functional Sciences, Victor Babeș University of Medicine and Pharmacy, E. Murgu Square, No. 2, 300041 Timisoara, Romania;
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Panigrahi G, Candia J, Dorsey TH, Tang W, Ohara Y, Byun JS, Minas TZ, Zhang A, Ajao A, Cellini A, Yfantis HG, Flis AL, Mann D, Ioffe O, Wang XW, Liu H, Loffredo CA, Napoles AM, Ambs S. Diabetes-associated breast cancer is molecularly distinct and shows a DNA damage repair deficiency. JCI Insight 2023; 8:e170105. [PMID: 37906280 PMCID: PMC10795835 DOI: 10.1172/jci.insight.170105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 10/25/2023] [Indexed: 11/02/2023] Open
Abstract
Diabetes commonly affects patients with cancer. We investigated the influence of diabetes on breast cancer biology using a 3-pronged approach that included analysis of orthotopic human tumor xenografts, patient tumors, and breast cancer cells exposed to diabetes/hyperglycemia-like conditions. We aimed to identify shared phenotypes and molecular signatures by investigating the metabolome, transcriptome, and tumor mutational burden. Diabetes and hyperglycemia did not enhance cell proliferation but induced mesenchymal and stem cell-like phenotypes linked to increased mobility and odds of metastasis. They also promoted oxyradical formation and both a transcriptome and mutational signatures of DNA repair deficiency. Moreover, food- and microbiome-derived metabolites tended to accumulate in breast tumors in the presence of diabetes, potentially affecting tumor biology. Breast cancer cells cultured under hyperglycemia-like conditions acquired increased DNA damage and sensitivity to DNA repair inhibitors. Based on these observations, we conclude that diabetes-associated breast tumors may show an increased drug response to DNA damage repair inhibitors.
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Affiliation(s)
- Gatikrushna Panigrahi
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Julián Candia
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
- Longitudinal Studies Section, Translational Gerontology Branch, National Institute on Aging, NIH, Baltimore, Maryland, USA
| | - Tiffany H. Dorsey
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Wei Tang
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
- Data Science & Artificial Intelligence, R&D, AstraZeneca, Gaithersburg, Maryland, USA
| | - Yuuki Ohara
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Jung S. Byun
- Division of Intramural Research, National Institute of Minority Health and Health Disparities, NIH, Bethesda, Maryland, USA
| | - Tsion Zewdu Minas
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Amy Zhang
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Anuoluwapo Ajao
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Ashley Cellini
- Department of Pathology, University of Maryland Medical Center, Baltimore, Maryland, USA
| | - Harris G. Yfantis
- Department of Pathology, University of Maryland Medical Center and Veterans Affairs Maryland Care System, Baltimore, Maryland, USA
| | - Amy L. Flis
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Dean Mann
- Department of Pathology, University of Maryland Medical Center, Baltimore, Maryland, USA
| | - Olga Ioffe
- Department of Pathology, University of Maryland Medical Center, Baltimore, Maryland, USA
| | - Xin W. Wang
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
- Liver Cancer Program, Center for Cancer Research, NCI, NIH, Bethesda, Maryland, USA
| | - Huaitian Liu
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
| | - Christopher A. Loffredo
- Cancer Prevention and Control Program, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, DC, USA
| | - Anna Maria Napoles
- Division of Intramural Research, National Institute of Minority Health and Health Disparities, NIH, Bethesda, Maryland, USA
| | - Stefan Ambs
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute (NCI), NIH, Bethesda, Maryland, USA
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4
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Bansal S, Burman A, Tripathi AK. Advanced glycation end products: Key mediator and therapeutic target of cardiovascular complications in diabetes. World J Diabetes 2023; 14:1146-1162. [PMID: 37664478 PMCID: PMC10473940 DOI: 10.4239/wjd.v14.i8.1146] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 03/21/2023] [Accepted: 05/22/2023] [Indexed: 08/11/2023] Open
Abstract
The incidence of type 2 diabetes mellitus is growing in epidemic proportions and has become one of the most critical public health concerns. Cardiovascular complications associated with diabetes are the leading cause of morbidity and mortality. The cardiovascular diseases that accompany diabetes include angina, myocardial infarction, stroke, peripheral artery disease, and congestive heart failure. Among the various risk factors generated secondary to hyperglycemic situations, advanced glycation end products (AGEs) are one of the important targets for future diagnosis and prevention of diabetes. In the last decade, AGEs have drawn a lot of attention due to their involvement in diabetic patho-physiology. AGEs can be derived exogenously and endogenously through various pathways. These are a non-homogeneous, chemically diverse group of compounds formed non-enzymatically by condensation between carbonyl groups of reducing sugars and free amino groups of protein, lipids, and nucleic acid. AGEs mediate their pathological effects at the cellular and extracellular levels by multiple pathways. At the cellular level, they activate signaling cascades via the receptor for AGEs and initiate a complex series of intracellular signaling resulting in reactive oxygen species generation, inflammation, cellular proliferation, and fibrosis that may possibly exacerbate the damaging effects on cardiac functions in diabetics. AGEs also cause covalent modifications and cross-linking of serum and extracellular matrix proteins; altering their structure, stability, and functions. Early diagnosis of diabetes may prevent its progression to complications and decrease its associated comorbidities. In the present review, we recapitulate the role of AGEs as a crucial mediator of hyperglycemia-mediated detrimental effects in diabetes-associated complications. Furthermore, this review presents an overview of future perspectives for new therapeutic interventions to ameliorate cardiovascular complications in diabetes.
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Affiliation(s)
- Savita Bansal
- Department of Biochemistry, Institute of Home Sciences, University of Delhi, New Delhi 110016, India
| | - Archana Burman
- Department of Biochemistry, Institute of Home Economics, University of Delhi, New Delhi 110016, India
| | - Asok Kumar Tripathi
- Department of Biochemistry, University College of Medical Sciences, University of Delhi, New Delhi 110095, India
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Karan BM, Little K, Augustine J, Stitt AW, Curtis TM. Aldehyde Dehydrogenase and Aldo-Keto Reductase Enzymes: Basic Concepts and Emerging Roles in Diabetic Retinopathy. Antioxidants (Basel) 2023; 12:1466. [PMID: 37508004 PMCID: PMC10376360 DOI: 10.3390/antiox12071466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/18/2023] [Accepted: 07/19/2023] [Indexed: 07/30/2023] Open
Abstract
Diabetic retinopathy (DR) is a complication of diabetes mellitus that can lead to vision loss and blindness. It is driven by various biochemical processes and molecular mechanisms, including lipid peroxidation and disrupted aldehyde metabolism, which contributes to retinal tissue damage and the progression of the disease. The elimination and processing of aldehydes in the retina rely on the crucial role played by aldehyde dehydrogenase (ALDH) and aldo-keto reductase (AKR) enzymes. This review article investigates the impact of oxidative stress, lipid-derived aldehydes, and advanced lipoxidation end products (ALEs) on the advancement of DR. It also provides an overview of the ALDH and AKR enzymes expressed in the retina, emphasizing their growing importance in DR. Understanding the relationship between aldehyde metabolism and DR could guide innovative therapeutic strategies to protect the retina and preserve vision in diabetic patients. This review, therefore, also explores various approaches, such as gene therapy and pharmacological compounds that have the potential to augment the expression and activity of ALDH and AKR enzymes, underscoring their potential as effective treatment options for DR.
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Affiliation(s)
- Burak Mugdat Karan
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast BT7 1NN, UK
| | - Karis Little
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast BT7 1NN, UK
| | - Josy Augustine
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast BT7 1NN, UK
| | - Alan W Stitt
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast BT7 1NN, UK
| | - Tim M Curtis
- Wellcome-Wolfson Institute for Experimental Medicine, Queen's University Belfast, Belfast BT7 1NN, UK
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6
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Patel SH, Carroll CC. Impact of elevated serum advanced glycation end products and exercise on intact and injured murine tendons. Connect Tissue Res 2023; 64:161-174. [PMID: 36282002 PMCID: PMC9992287 DOI: 10.1080/03008207.2022.2135508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Accepted: 10/09/2022] [Indexed: 02/03/2023]
Abstract
OVERVIEW Delayed tendon healing is a significant clinical challenge for those with diabetes. We explored the role of advanced glycation end-products (AGEs), a protein modification present at elevated levels in serum of individuals with diabetes, on injured and intact tendons using a mouse model. Cell proliferation following tissue injury is a vital component of healing. Based on our previous work demonstrating that AGEs limit cell proliferation, we proposed that AGEs are responsible for the delayed healing process commonly observed in diabetic patients. Further, in pursuit of interventional strategies, we suggested that moderate treadmill exercise may support a healing environment in the presence of AGEs as exercise has been shown to stimulate cell proliferation in tendon tissue. MATERIALS AND METHODS Mice began receiving daily intraperitoneal injections of bovine serum albumin (BSA)-Control or AGE-BSA injections (200μg/ml) at 16-weeks of age. A tendon injury was created in the central third of both patellar tendons. Animals assigned to an exercise group began a moderate treadmill protocol one week following injury. The intact Achilles tendon and soleus muscle were also evaluated to assess the effect of BSA and AGE-BSA on un-injured muscle and tendon. RESULTS We demonstrate that our injection dosing and schedule lead to an increase in serum AGEs. Our findings imply that AGEs indeed modulate gene expression following a patellar tendon injury and have modest effects on gene expression in intact muscle and tendon. CONCLUSIONS While additional biomechanical analysis is warranted, these data suggest that elevated serum AGEs in persons with diabetes may impact tendon health.
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Affiliation(s)
- Shivam H. Patel
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN
| | - Chad C. Carroll
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN
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7
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Patel SH, Mendias CL, Carroll CC. Descriptive transcriptome analysis of tendon derived fibroblasts following in-vitro exposure to advanced glycation end products. PLoS One 2022; 17:e0271770. [PMID: 35881579 PMCID: PMC9321369 DOI: 10.1371/journal.pone.0271770] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 07/06/2022] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Tendon pathologies affect a large portion of people with diabetes. This high rate of tendon pain, injury, and disease appears to manifest independent of well-controlled HbA1c and fasting blood glucose. Advanced glycation end products (AGEs) are elevated in the serum of those with diabetes. In vitro, AGEs severely impact tendon fibroblast proliferation and mitochondrial function. However, the extent that AGEs impact the tendon cell transcriptome has not been evaluated. OBJECTIVE The purpose of this study was to investigate transcriptome-wide changes that occur to tendon-derived fibroblasts following treatment with AGEs. We propose to complete a descriptive approach to pathway profiling to broaden our mechanistic understanding of cell signaling events that may contribute to the development of tendon pathology. METHODS Rat Achilles tendon fibroblasts were treated with glycolaldehyde-derived AGEs (200μg/ml) for 48 hours in normal glucose (5.5mM) conditions. In addition, total RNA was isolated, and the PolyA+ library was sequenced. RESULTS We demonstrate that tendon fibroblasts treated with 200μg/ml of AGEs differentially express 2,159 gene targets compared to fibroblasts treated with an equal amount of BSA-Control. Additionally, we report in a descriptive and ranked fashion 21 implicated cell-signaling pathways. CONCLUSION Our findings suggest that AGEs disrupt the tendon fibroblast transcriptome on a large scale and that these pathways may contribute to the development and progression of diabetic tendinopathy. Specifically, pathways related to cell cycle progression and extracellular matrix remodeling were affected in our data set and may play a contributing role in the development of diabetic tendon complications.
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Affiliation(s)
- Shivam H. Patel
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN, United States of America
| | - Christopher L. Mendias
- Hospital for Special Surgery, New York, NY, United States of America
- Department of Physiology and Biophysics, Weill Cornell Medical College, New York, NY, United States of America
| | - Chad C. Carroll
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN, United States of America
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Frudd K, Sivaprasad S, Raman R, Krishnakumar S, Revathy YR, Turowski P. Diagnostic circulating biomarkers to detect vision-threatening diabetic retinopathy: Potential screening tool of the future? Acta Ophthalmol 2022; 100:e648-e668. [PMID: 34269526 DOI: 10.1111/aos.14954] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 06/02/2021] [Accepted: 06/17/2021] [Indexed: 12/12/2022]
Abstract
With the increasing prevalence of diabetes in developing and developed countries, the socio-economic burden of diabetic retinopathy (DR), the leading complication of diabetes, is growing. Diabetic retinopathy (DR) is currently one of the leading causes of blindness in working-age adults worldwide. Robust methodologies exist to detect and monitor DR; however, these rely on specialist imaging techniques and qualified practitioners. This makes detecting and monitoring DR expensive and time-consuming, which is particularly problematic in developing countries where many patients will be remote and have little contact with specialist medical centres. Diabetic retinopathy (DR) is largely asymptomatic until late in the pathology. Therefore, early identification and stratification of vision-threatening DR (VTDR) is highly desirable and will ameliorate the global impact of this disease. A simple, reliable and more cost-effective test would greatly assist in decreasing the burden of DR around the world. Here, we evaluate and review data on circulating protein biomarkers, which have been verified in the context of DR. We also discuss the challenges and developments necessary to translate these promising data into clinically useful assays, to detect VTDR, and their potential integration into simple point-of-care testing devices.
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Affiliation(s)
- Karen Frudd
- Institute of Ophthalmology University College London London UK
| | - Sobha Sivaprasad
- Institute of Ophthalmology University College London London UK
- NIHR Moorfields Biomedical Research Centre Moorfields Eye Hospital London UK
| | - Rajiv Raman
- Vision Research Foundation Sankara Nethralaya Chennai Tamil Nadu India
| | | | | | - Patric Turowski
- Institute of Ophthalmology University College London London UK
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9
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Yamamoto T, Kase S, Murata M, Ishida S. Serum advanced glycation end‑products and αB‑crystallin in diabetic retinopathy patients. Biomed Rep 2022; 16:28. [DOI: 10.3892/br.2022.1511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/04/2022] [Indexed: 11/06/2022] Open
Affiliation(s)
- Taku Yamamoto
- Laboratory of Ocular Cell Biology and Visual Science, Department of Ophthalmology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido 060‑8638, Japan
| | - Satoru Kase
- Laboratory of Ocular Cell Biology and Visual Science, Department of Ophthalmology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido 060‑8638, Japan
| | - Miyuki Murata
- Laboratory of Ocular Cell Biology and Visual Science, Department of Ophthalmology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido 060‑8638, Japan
| | - Susumu Ishida
- Laboratory of Ocular Cell Biology and Visual Science, Department of Ophthalmology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Hokkaido 060‑8638, Japan
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10
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Dhaliwal R, Ewing SK, Vashishth D, Semba RD, Schwartz AV. Greater Carboxy-Methyl-Lysine Is Associated With Increased Fracture Risk in Type 2 Diabetes. J Bone Miner Res 2022; 37:265-272. [PMID: 34820902 PMCID: PMC8828668 DOI: 10.1002/jbmr.4466] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 09/20/2021] [Accepted: 10/02/2021] [Indexed: 02/06/2023]
Abstract
Accumulation of advanced glycation end-products (AGE) in bone alters collagen structure and function. Fluorescent AGEs are associated with fractures but less is known regarding non-fluorescent AGEs. We examined associations of carboxy-methyl-lysine (CML), with incident clinical and prevalent vertebral fractures by type 2 diabetes (T2D) status, in the Health, Aging, and Body Composition cohort of older adults. Incident clinical fractures and baseline vertebral fractures were assessed. Cox regression was used to analyze the associations between serum CML and clinical fracture incidence, and logistic regression for vertebral fracture prevalence. At baseline, mean ± standard deviation (SD) age was 73.7 ± 2.8 and 73.6 ± 2.9 years in T2D (n = 712) and non-diabetes (n = 2332), respectively. Baseline CML levels were higher in T2D than non-diabetes (893 ± 332 versus 771 ± 270 ng/mL, p < 0.0001). In multivariate models, greater CML was associated with higher risk of incident clinical fracture in T2D (hazard ratio [HR] 1.49; 95% confidence interval [CI], 1.24-1.79 per 1-SD increase in log CML) but not in non-diabetes (HR 1.03; 95% CI, 0.94-1.13; p for interaction = 0.001). This association was independent of bone mineral density (BMD), glycated hemoglobin (hemoglobin A1c), weight, weight loss, smoking, cystatin-C, and medication use. CML was not significantly associated with the odds of prevalent vertebral fractures in either group. In conclusion, higher CML levels are associated with increased risk of incident clinical fractures in T2D, independent of BMD. These results implicate CML in the pathogenesis of bone fragility in diabetes. © 2021 American Society for Bone and Mineral Research (ASBMR).
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Affiliation(s)
- Ruban Dhaliwal
- Metabolic Bone Disease Center, State University of New York Upstate Medical University, New York, NY, USA
| | - Susan K. Ewing
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA
| | - Deepak Vashishth
- Department of Biomedical Engineering, Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, New York, NY, USA
| | - Richard D. Semba
- Department of Ophthalmology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ann V. Schwartz
- Department of Epidemiology and Biostatistics, University of California San Francisco, San Francisco, CA, USA
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11
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Ammanath G, Delachi CG, Karabacak S, Ali Y, Boehm BO, Yildiz UH, Alagappan P, Liedberg B. Colorimetric and Fluorometric Profiling of Advanced Glycation End Products. ACS APPLIED MATERIALS & INTERFACES 2022; 14:94-103. [PMID: 34964349 DOI: 10.1021/acsami.1c16261] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Profiling of advanced glycation end products (AGEs) is an emerging area of clinical significance for disease diagnosis and prognosis. Typically, concentrations of AGEs are estimated in laboratories by trained personnel using sophisticated equipment. Herein, a facile approach for colorimetric and fluorometric profiling of AGEs is reported for rapid and on-site analysis. The concentrations of AGE levels in plasma are estimated via changes in optical properties of polythiophenes (PTs) upon interaction with aptamers (Apts) in the presence and in the absence of AGEs. To validate the proposed approach, glyceraldehyde-derived AGEs (AGE class 1 [AGE1]), the biomarker associated with cardiovascular diseases and diabetes, are used as a model system. Colorimetric analysis yielded linear responses for AGE1 for clinically relevant concentration ranges between 1.5 and 300 μg/mL with a limit of detection (LOD) of ∼1.3 μg/mL. Subsequently, an approach utilizing PTs with four different pendant groups in conjunction with four different Apts is demonstrated for qualitative colorimetric profiling and for quantitative fluorometric profiling of up to four AGEs in clinical matrices. Principal component analysis (PCA) of fluorometric responses of AGE-spiked samples yielded distinct responses for the different AGEs tested. Thus, the proposed approach ascertains rapid profiling of spiked AGEs in plasma samples without the requirement of preanalytical processing and advanced instrumentation, thereby facilitating on-site diagnosis.
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Affiliation(s)
- Gopal Ammanath
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore, Singapore
| | - Carla Giorgia Delachi
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore, Singapore
| | - Soner Karabacak
- Department of Chemistry, Izmir Institute of Technology, Urla, 35430 Izmir, Turkey
| | - Yusuf Ali
- Lee Kong Chian School of Medicine, Nanyang Technological University, 308232 Singapore, Singapore
| | - Bernhard O Boehm
- Lee Kong Chian School of Medicine, Nanyang Technological University, 308232 Singapore, Singapore
| | - Umit Hakan Yildiz
- Department of Chemistry, Izmir Institute of Technology, Urla, 35430 Izmir, Turkey
| | - Palaniappan Alagappan
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore, Singapore
| | - Bo Liedberg
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore, Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore, Singapore
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12
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Glyoxal-Lysine Dimer, an Advanced Glycation End Product, Induces Oxidative Damage and Inflammatory Response by Interacting with RAGE. Antioxidants (Basel) 2021; 10:antiox10091486. [PMID: 34573117 PMCID: PMC8470194 DOI: 10.3390/antiox10091486] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 09/13/2021] [Accepted: 09/14/2021] [Indexed: 01/16/2023] Open
Abstract
The glyoxal-lysine dimer (GOLD), which is a glyoxal (GO)-derived advanced glycation end product (AGE), is produced by the glycation reaction. In this study, we evaluated the effect of GOLD on the oxidative damage and inflammatory response in SV40 MES 13 mesangial cells. GOLD significantly increased the linkage with the V-type immunoglobulin domain of RAGE, a specific receptor of AGE. We found that GOLD treatment increased RAGE expression and reactive oxygen species (ROS) production in mesangial cells. GOLD remarkably regulated the protein and mRNA expression of nuclear factor erythroid 2-related factor 2 (NRF2) and glyoxalase 1 (GLO1). In addition, mitochondrial deterioration and inflammation occurred via GOLD-induced oxidative stress in mesangial cells. GOLD regulated the mitogen-activated protein kinase (MAPK) and the release of proinflammatory cytokines associated with the inflammatory mechanism of mesangial cells. Furthermore, oxidative stress and inflammatory responses triggered by GOLD were suppressed through RAGE inhibition using RAGE siRNA. These results demonstrate that the interaction of GOLD and RAGE plays an important role in the function of mesangial cells.
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13
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Lee HW, Gu MJ, Lee JY, Lee S, Kim Y, Ha SK. Methylglyoxal-Lysine Dimer, an Advanced Glycation End Product, Induces Inflammation via Interaction with RAGE in Mesangial Cells. Mol Nutr Food Res 2021; 65:e2000799. [PMID: 33890707 DOI: 10.1002/mnfr.202000799] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 04/15/2021] [Indexed: 12/29/2022]
Abstract
INTRODUCTION Advanced glycation end products (AGEs) and receptor of advanced glycation end products (RAGE) mediate renal function during diabetic and non-diabetic nephropathy development. Methylglyoxal-lysine dimer (MOLD), a typical toxic advanced glycation end product (TAGE), contributes to inflammatory responses during renal diseases. This study determines the effect of MOLD on inflammatory responses in mouse mesangial cells. METHODS AND RESULTS The murine mesangial cell line SV40 MES 13 is used to assess nuclear factor-kappa B (NF-κB) expression, reactive oxygen species (ROS) production, and mitochondria labeling. The interaction model between RAGE and MOLD is also determined. MOLD treatment of mesangial cells markedly increases RAGE expression and the linkage with V-type Ig domain of RAGE. MOLD induces ROS production and mitochondrial dysfunction. MOLD activates phosphatidylinositol 3-kinase-protein kinase B (PI3KB) and NF-κB signaling pathways. It is confirmed that these changes are reversed when ROS is suppressed. These effects may be regulated through mitogen-activated protein kinases and pro-inflammatory cytokines in circulatory inflammation responses. CONCLUSION MOLD plays a major role in nephropathy via ROS production and mitochondrial dysfunction through direct association with RAGE. Further, the NF-kB and PI3K/AKT signaling pathways triggered by ROS mediate the inflammatory response to exacerbate MOLD-induced damages in inflammation-related diabetic and non-diabetic renal diseases.
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Affiliation(s)
- Hee-Weon Lee
- Korea Food Research Institute, 245, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Min Ji Gu
- Korea Food Research Institute, 245, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Jee-Young Lee
- Molecular Design Team, New Drug Development Center, Daegu Gyeongbuk Medical Innovation Foundation (DGMIF), Daegu, 41061, South Korea
| | - Seungju Lee
- Molecular Design Team, New Drug Development Center, Daegu Gyeongbuk Medical Innovation Foundation (DGMIF), Daegu, 41061, South Korea
| | - Yoonsook Kim
- Korea Food Research Institute, 245, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Sang Keun Ha
- Korea Food Research Institute, 245, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea.,Division of Food Biotechnology, University of Science and Technology, Daejeon, Korea
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14
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Peng WK, Chen L, Boehm BO, Han J, Loh TP. Molecular phenotyping of oxidative stress in diabetes mellitus with point-of-care NMR system. NPJ Aging Mech Dis 2020; 6:11. [PMID: 33083002 PMCID: PMC7536436 DOI: 10.1038/s41514-020-00049-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 09/09/2020] [Indexed: 12/18/2022] Open
Abstract
Diabetes mellitus is one of the fastest-growing health burdens globally. Oxidative stress, which has been implicated in the pathogenesis of diabetes complication (e.g., cardiovascular event), remains poorly understood. We report a new approach to rapidly manipulate and evaluate the redox states of blood using a point-of-care NMR system. Various redox states of the hemoglobin were mapped out using the newly proposed (pseudo) two-dimensional map known as T1-T2 magnetic state diagram. We exploit the fact that oxidative stress changes the subtle molecular motion of water proton in the blood, and thus inducing a measurable shift in magnetic resonance relaxation properties. We demonstrated the clinical utilities of this technique to rapidly stratify diabetes subjects based on their oxidative status in conjunction to the traditional glycemic level to improve the patient stratification and thus the overall outcome of clinical diabetes care and management.
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Affiliation(s)
- Weng Kung Peng
- Precision Medicine–Engineering Group, International Iberian Nanotechnology Laboratory, Braga, Portugal
- BioSystems & Micromechanics IRG (BioSyM), Singapore-MIT Alliance for Research and Technology (SMART) Centre, Singapore, Singapore
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
| | - Lan Chen
- BioSystems & Micromechanics IRG (BioSyM), Singapore-MIT Alliance for Research and Technology (SMART) Centre, Singapore, Singapore
| | - Bernhard O. Boehm
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore
- Ulm University Medical Centre, Department of Internal Medicine 1, Ulm University, Ulm, Germany
- Imperial College London, London, UK
| | - Jongyoon Han
- BioSystems & Micromechanics IRG (BioSyM), Singapore-MIT Alliance for Research and Technology (SMART) Centre, Singapore, Singapore
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 36-841, 77 Massachusetts Avenue, Cambridge, MA 02139 USA
- Department of Biological Engineering, Massachusetts Institute of Technology, 36-841, 77 Massachusetts Avenue, Cambridge, MA 02139 USA
| | - Tze Ping Loh
- Department of Laboratory Medicine, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074 Singapore
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15
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Yeasmin S, Ammanath G, Ali Y, Boehm BO, Yildiz UH, Palaniappan A, Liedberg B. Colorimetric Urinalysis for On-Site Detection of Metabolic Biomarkers. ACS APPLIED MATERIALS & INTERFACES 2020; 12:31270-31281. [PMID: 32551533 DOI: 10.1021/acsami.0c09179] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Over the past few decades, colorimetric assays have been developed for cost-effective and rapid on-site urinalysis. Most of these assays were employed for detection of biomarkers such as glucose, uric acid, ions, and albumin that are abundant in urine at micromolar to millimolar levels. In contrast, direct assaying of urinary biomarkers such as glycated proteins, low-molecular-weight reactive oxygen species, and nucleic acids that are present at significantly lower levels (nanomolar to picomolar) remain challenging due to the interferences from the urine sample matrix. State-of-the-art assays for detection of trace amounts of urinary biomarkers typically utilize time-consuming and equipment-dependent sample pretreatment or clean-up protocols prior to assaying, which limits their applicability for on-site analysis. Herein, we report a colorimetric assay for on-site detection of trace amount of generic biomarkers in urine without involving tedious sample pretreatment protocols. The detection strategy is based on monitoring the changes in optical properties of poly(3-(4-methyl-3'-thienyloxy)propyltriethylammonium bromide) upon interacting with an aptamer or a peptide nucleic acid in the presence and absence of target biomarkers of relevance for the diagnosis of metabolic complications and diabetes. As a proof of concept, this study demonstrates facile assaying of advanced glycation end products, 8-hydroxy-2'-deoxyguanosine and hepatitis B virus DNA in urine samples at clinically relevant concentrations, with limits of detection of ∼850 pM, ∼650 pM, and ∼ 1 nM, respectively. These analytes represent three distinct classes of biomarkers: (i) glycated proteins, (ii) low-molecular-weight reactive oxygen species, and (iii) nucleic acids. Hence, the proposed methodology is applicable for rapid detection of generic biomarkers in urine, without involving sophisticated equipment and skilled personnel, thereby enabling on-site urinalysis. At the end of the contribution, we discuss the opportunity to translate the homogeneous assay into a paper-based format.
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Affiliation(s)
- Sanjida Yeasmin
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Gopal Ammanath
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Yusuf Ali
- Lee Kong Chian School of Medicine, Nanyang Technological University, 308232 Singapore
| | - Bernhard O Boehm
- Lee Kong Chian School of Medicine, Nanyang Technological University, 308232 Singapore
| | - Umit Hakan Yildiz
- Department of Chemistry, Izmir Institute of Technology, Urla, Izmir 35430, Turkey
| | - Alagappan Palaniappan
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
| | - Bo Liedberg
- Centre for Biomimetic Sensor Science, Nanyang Technological University, 637553 Singapore
- School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
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16
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Sanchis P, Rivera R, Fortuny R, Río C, Mas-Gelabert M, Gonzalez-Freire M, Grases F, Masmiquel L. Role of Advanced Glycation End Products on Aortic Calcification in Patients with Type 2 Diabetes Mellitus. J Clin Med 2020; 9:jcm9061751. [PMID: 32516928 PMCID: PMC7356630 DOI: 10.3390/jcm9061751] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/01/2020] [Accepted: 06/02/2020] [Indexed: 12/13/2022] Open
Abstract
The aim of this study was to evaluate the relationship between serum levels of advanced glycation end products (AGEs) and abdominal aortic calcification (AAC) in patients with type 2 diabetes mellitus (DM2). This was a prospective cross-sectional study. One-hundred and four consecutive patients with DM2 were given lateral lumbar X-rays in order to quantify abdominal aortic calcification (AAC). Circulating levels of AGEs and classical cardiovascular risk factors were determined. Clinical history was also registered. Patients with higher AGEs values had higher grades of aortic calcification and higher numbers of diabetic-related complications. Multivariate logistic regression analysis showed that being older, male and having high levels of AGEs and triglycerides were the independent risk factors associated to moderate-severe AAC when compared to no-mild AAC. Our results suggest that AGEs plays a role in the pathogenesis of aortic calcifications. In addition, the measurement of AGEs levels may be useful for assessing the severity of AAC in the setting of diabetic complications.
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Affiliation(s)
- Pilar Sanchis
- Vascular and Metabolic Diseases Research Group, Endocrinology Department, Son Llàtzer University Hospital, Health Research Institute of the Balearic Islands [IUNICS-IdISBa], 07198 Palma of Mallorca, Spain; (R.R.); (R.F.); (M.G.-F.)
- Laboratory of Renal Lithiasis Research, Deptartment of Chemistry, University of Balearic Islands, Health Research Institute of the Balearic Islands [IUNICS-IdISBa], 07122 Palma of Mallorca, Spain;
- The Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Instituto de Salud Carlos III, 28046 Madrid, Spain
- Correspondence: (P.S.); (L.M.)
| | - Rosmeri Rivera
- Vascular and Metabolic Diseases Research Group, Endocrinology Department, Son Llàtzer University Hospital, Health Research Institute of the Balearic Islands [IUNICS-IdISBa], 07198 Palma of Mallorca, Spain; (R.R.); (R.F.); (M.G.-F.)
| | - Regina Fortuny
- Vascular and Metabolic Diseases Research Group, Endocrinology Department, Son Llàtzer University Hospital, Health Research Institute of the Balearic Islands [IUNICS-IdISBa], 07198 Palma of Mallorca, Spain; (R.R.); (R.F.); (M.G.-F.)
- Laboratory Department, Son Llàtzer University Hospital, 07198 Palma of Mallorca, Spain
| | - Carlos Río
- Proteomics department, Health Research Institute of the Balearic Islands (IdISBa), 07120 Palma of Mallorca, Spain;
| | - Miguel Mas-Gelabert
- Radiology Department, Son Llàtzer University Hospital, 07198 Palma of Mallorca, Spain;
| | - Marta Gonzalez-Freire
- Vascular and Metabolic Diseases Research Group, Endocrinology Department, Son Llàtzer University Hospital, Health Research Institute of the Balearic Islands [IUNICS-IdISBa], 07198 Palma of Mallorca, Spain; (R.R.); (R.F.); (M.G.-F.)
| | - Felix Grases
- Laboratory of Renal Lithiasis Research, Deptartment of Chemistry, University of Balearic Islands, Health Research Institute of the Balearic Islands [IUNICS-IdISBa], 07122 Palma of Mallorca, Spain;
- The Spanish Biomedical Research Centre in Physiopathology of Obesity and Nutrition (CIBERObn), Instituto de Salud Carlos III, 28046 Madrid, Spain
| | - Luis Masmiquel
- Vascular and Metabolic Diseases Research Group, Endocrinology Department, Son Llàtzer University Hospital, Health Research Institute of the Balearic Islands [IUNICS-IdISBa], 07198 Palma of Mallorca, Spain; (R.R.); (R.F.); (M.G.-F.)
- Correspondence: (P.S.); (L.M.)
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17
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Hernández C, Porta M, Bandello F, Grauslund J, Harding SP, Aldington SJ, Egan C, Frydkjaer-Olsen U, García-Arumí J, Gibson J, Lang GE, Lattanzio R, Massin P, Midena E, Ponsati B, Ribeiro L, Scanlon P, Cunha-Vaz J, Simó R. The Usefulness of Serum Biomarkers in the Early Stages of Diabetic Retinopathy: Results of the EUROCONDOR Clinical Trial. J Clin Med 2020; 9:jcm9041233. [PMID: 32344735 PMCID: PMC7231127 DOI: 10.3390/jcm9041233] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 04/16/2020] [Accepted: 04/20/2020] [Indexed: 12/22/2022] Open
Abstract
The main aim of this study was to evaluate the ability of serum biomarkers to predict the worsening of retinal neurodysfunction in subjects with type 2 diabetes. For this purpose, we measured selected molecules (N-epsilon-carboxy methyl lysine (CML), laminin P1 (Lam-P1), and asymmetric dimethylarginine (ADMA)) in the serum of 341 participants of the EUROCONDOR study at baseline, 24, and 48 weeks. Retinal neurodysfunction was assessed by measuring implicit time (IT) using multifocal electroretinography, and structural changes were examined by spectral domain–optical coherence tomography. The values of IT at baseline were directly correlated with baseline serum concentrations of CML (r = 0.135, p = 0.013). Furthermore, in the placebo group, increase in CML concentration throughout follow-up correlated with the IT (r = 0.20; p = 0.03). Baseline serum levels of CML also correlated with macular retinal thickness (RT) (r = 0.231; p < 0.001). Baseline Lam-P1 levels correlated with the increase of the RT at the end of follow-up in the placebo group (r = 0.22; p = 0.016). We provide evidence that CML may be a biomarker of both retinal neurodysfunction and RT, whereas Lam-P1 was associated with RT only. Therefore, circulating levels of these molecules could provide a complementary tool for monitoring the early changes of diabetic retinopathy (DR).
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Affiliation(s)
- Cristina Hernández
- Diabetes and Metabolism Research Unit and CIBERDEM, Vall d’Hebron Research Institute, 08035 Barcelona, Spain;
- Correspondence:
| | - Massimo Porta
- Department of Medical Sciences, University of Turin, 10124 Turin, Italy;
| | - Francesco Bandello
- Department of Ophthalmology, Scientific Institute San Raffaele, University Vita-Salute, 20132 Milano, Italy; (F.B.); (R.L.)
| | - Jakob Grauslund
- Research Unit of Ophthalmology, Department of Clinical Research, University of Southern Denmark, 5230 Odense, Denmark; (J.G.); (U.F.-O.)
| | - Simon P. Harding
- Department of Eye & Vision Science, Institute of Ageing and Chronic Disease, University of Liverpool, and St. Pauls’ Eye Unit. Liverpool University Hospitals, members of Liverpool Health Partners, Liverpool L69 7ZX, UK;
| | - Stephen J. Aldington
- Gloucestershire Hospitals National Health Service Foundation Trust, Cheltenham GL53 7AG, UK; (S.J.A.); (P.S.)
| | - Catherine Egan
- Moorfields Eye Hospital National Health Service Foundation Trust, Institute of Ophthalmology/University College London, London EC1V 2PD, UK;
| | - Ulrik Frydkjaer-Olsen
- Research Unit of Ophthalmology, Department of Clinical Research, University of Southern Denmark, 5230 Odense, Denmark; (J.G.); (U.F.-O.)
| | - José García-Arumí
- Department of Ophthalmology, Vall d’Hebron University Hospital, 08035 Barcelona, Spain;
| | - Jonathan Gibson
- Department of Vision Sciences, Aston University, Birmingham B4 7ET, UK;
| | - Gabriele E. Lang
- Department of Ophthalmology, University of Ulm, 89081 Ulm, Germany;
| | - Rosangela Lattanzio
- Department of Ophthalmology, Scientific Institute San Raffaele, University Vita-Salute, 20132 Milano, Italy; (F.B.); (R.L.)
| | - Pascale Massin
- Department of Ophthalmology, Lariboisière Hospital, 75004 Paris, France;
| | - Edoardo Midena
- Department of Ophthalmology, University of Padova, 35122 Padova, Italy;
| | | | - Luísa Ribeiro
- Association for Innovation and Biomedical Research on Light and Image (AIBILI), 3000-548 Coimbra, Portugal; (L.R.); (J.C.-V.)
| | - Peter Scanlon
- Gloucestershire Hospitals National Health Service Foundation Trust, Cheltenham GL53 7AG, UK; (S.J.A.); (P.S.)
| | - José Cunha-Vaz
- Association for Innovation and Biomedical Research on Light and Image (AIBILI), 3000-548 Coimbra, Portugal; (L.R.); (J.C.-V.)
| | - Rafael Simó
- Diabetes and Metabolism Research Unit and CIBERDEM, Vall d’Hebron Research Institute, 08035 Barcelona, Spain;
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18
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Augustine J, Troendle EP, Barabas P, McAleese CA, Friedel T, Stitt AW, Curtis TM. The Role of Lipoxidation in the Pathogenesis of Diabetic Retinopathy. Front Endocrinol (Lausanne) 2020; 11:621938. [PMID: 33679605 PMCID: PMC7935543 DOI: 10.3389/fendo.2020.621938] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Accepted: 12/21/2020] [Indexed: 12/31/2022] Open
Abstract
Lipids can undergo modification as a result of interaction with reactive oxygen species (ROS). For example, lipid peroxidation results in the production of a wide variety of highly reactive aldehyde species which can drive a range of disease-relevant responses in cells and tissues. Such lipid aldehydes react with nucleophilic groups on macromolecules including phospholipids, nucleic acids, and proteins which, in turn, leads to the formation of reversible or irreversible adducts known as advanced lipoxidation end products (ALEs). In the setting of diabetes, lipid peroxidation and ALE formation has been implicated in the pathogenesis of macro- and microvascular complications. As the most common diabetic complication, retinopathy is one of the leading causes of vision loss and blindness worldwide. Herein, we discuss diabetic retinopathy (DR) as a disease entity and review the current knowledge and experimental data supporting a role for lipid peroxidation and ALE formation in the onset and development of this condition. Potential therapeutic approaches to prevent lipid peroxidation and lipoxidation reactions in the diabetic retina are also considered, including the use of antioxidants, lipid aldehyde scavenging agents and pharmacological and gene therapy approaches for boosting endogenous aldehyde detoxification systems. It is concluded that further research in this area could lead to new strategies to halt the progression of DR before irreversible retinal damage and sight-threatening complications occur.
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Affiliation(s)
- Josy Augustine
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Science, Queen’s University of Belfast, Belfast, United Kingdom
| | - Evan P. Troendle
- Department of Chemistry, King’s College London, London, United Kingdom
| | - Peter Barabas
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Science, Queen’s University of Belfast, Belfast, United Kingdom
| | - Corey A. McAleese
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Science, Queen’s University of Belfast, Belfast, United Kingdom
| | - Thomas Friedel
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Science, Queen’s University of Belfast, Belfast, United Kingdom
| | - Alan W. Stitt
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Science, Queen’s University of Belfast, Belfast, United Kingdom
| | - Tim M. Curtis
- Wellcome-Wolfson Institute for Experimental Medicine, School of Medicine, Dentistry & Biomedical Science, Queen’s University of Belfast, Belfast, United Kingdom
- *Correspondence: Tim M. Curtis,
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19
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Saxena S, Caprnda M, Ruia S, Prasad S, Fedotova J, Kruzliak P, Krasnik V. Spectral domain optical coherence tomography based imaging biomarkers for diabetic retinopathy. Endocrine 2019; 66:509-516. [PMID: 31571130 DOI: 10.1007/s12020-019-02093-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 09/13/2019] [Indexed: 01/17/2023]
Abstract
To evaluate the role of central subfield thickness (CST), cube average thickness (CAT), and cube volume (CV) as imaging biomarkers for severity of diabetic retinopathy within the ETDRS-based grades of retinopathy using spectral domain optical coherence tomography (SD-OCT). This study aims to evaluate the role of macular CST, CAT, and CV on SD-OCT as imaging biomarkers for severity of DR. One hundred ninety-four consecutive cases of type 2 diabetes mellitus were divided according to ETDRS classification: diabetes mellitus without retinopathy (No DR; n = 65), nonproliferative diabetic retinopathy (NPDR; n = 66), and proliferative diabetic retinopathy (PDR; n = 63). Sixty-three healthy controls were included. CST, CAT, and CV were analyzed using SD-OCT. Data were analyzed statistically. Analysis of variance revealed a significant increase in levels of CST, CAT, CV, and LogMAR visual acuity with the increase in severity of DR. Independent t-test revealed significant difference in CST, CAT, and CV between cases with DME and cases without DME. On multivariate linear regression analysis, increase in CST, CAT, and CV were found to indicate the increase in severity of DR. SD-OCT-based imaging biomarkers CST, CAT, and CV are effective tools for documenting the severity of diabetic retinopathy. These imaging biomarkers serve as significant indicators of severity of disease.
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Affiliation(s)
- Sandeep Saxena
- Department of Ophthalmology, King George's Medical University, Lucknow, India.
| | - Martin Caprnda
- 1st Department of Internal Medicine, Faculty of Medicine, Comenius University and University Hospital, Bratislava, Slovakia
| | - Surabhi Ruia
- Department of Ophthalmology, King George's Medical University, Lucknow, India
| | - Senthamizh Prasad
- Department of Community Medicine, King George's Medical University, Lucknow, India
| | - Julia Fedotova
- Laboratory of Neuroendocrinology, I.P. Pavlov Institute of Physiology, Russian Academy of Sciences, St, Petersburg, Russia
- Department of Chemistry and Molecular Biology, ITMO University, St, Petersburg, Russia
| | - Peter Kruzliak
- Department of Internal Medicine, Brothers of Mercy Hospital, Brno, Czech Republic.
- 2nd Department of Surgery, Faculty of Medicine, Masaryk University and St. Anne´s University Hospital, Brno, Czech Republic.
| | - Vladimir Krasnik
- Department of Ophthalmology, Faculty of Medicine, Comenius University and University Hospital, Bratislava, Slovakia
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20
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Yoshitake T, Murakami T, Yoshitake S, Suzuma K, Dodo Y, Fujimoto M, Ito S, Tsujikawa A. Anti-Hexokinase 1 Antibody as a Novel Serum Biomarker of a Subgroup of Diabetic Macular Edema. Sci Rep 2019; 9:4806. [PMID: 30886155 PMCID: PMC6423027 DOI: 10.1038/s41598-019-39777-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 02/01/2019] [Indexed: 01/01/2023] Open
Abstract
Diabetic retinopathy (DR) induces the breakdown of the blood-retinal barrier and promotes neuroinflammation, although autoimmune responses to sequestered retinal antigens remain poorly understood. In this study, we investigated the autoantibodies for retinal antigens in sera from diabetic macular edema (DME) patients. Screening by immunoblotting demonstrated that IgG from 7 of 10 DME sera samples reacted to an ~102-kDa autoantigen from porcine retinas. Immunoprecipitation with autoantibodies from DME sera and subsequent mass spectrometry enabled us to identify hexokinase 1 as an autoantigen reactive to IgG from DME sera. IgG in 7 of 10 DME sera partially colocalized to hexokinase 1 in the outer plexiform layer of rodent retinas. Quantitative analyses using enzyme-linked immunosorbent assays revealed that the serum titers of this autoantibody were significantly higher in the DME sera than those in the sera from diabetic patients without DME, and 20 (24.1%) of the 83 DME serum samples had higher IgG titers than the cutoff value (mean + 2 standard deviations of the sera from diabetic patients without DR). Multivariate logistic regression analysis confirmed that the higher titer of anti-hexokinase 1 IgG was clinically feasible for the diagnosis of DME. These data identify anti-hexokinase 1 antibody as a serum biomarker of a subset of DME.
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Affiliation(s)
- Tatsuya Yoshitake
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Tomoaki Murakami
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan.
| | - Shin Yoshitake
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Kiyoshi Suzuma
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Yoko Dodo
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Masahiro Fujimoto
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
| | - Shinji Ito
- Medical Research Support Center, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Akitaka Tsujikawa
- Department of Ophthalmology and Visual Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan
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Relationship between choroidal structure and duration of diabetes. Graefes Arch Clin Exp Ophthalmol 2019; 257:1133-1140. [DOI: 10.1007/s00417-019-04295-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 02/25/2019] [Accepted: 03/10/2019] [Indexed: 12/11/2022] Open
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Innovative Proposals on the Implementation of Dietary Supplements for Diabetes Mellitus and Helicobacteriosis. SCIENCE AND INNOVATION 2018. [DOI: 10.15407/scine14.05.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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23
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Early detection of diabetic retinopathy. Surv Ophthalmol 2018; 63:601-608. [DOI: 10.1016/j.survophthal.2018.04.003] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Revised: 04/07/2018] [Accepted: 04/09/2018] [Indexed: 12/15/2022]
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Simó-Servat O, Planas A, Ciudin A, Simó R, Hernández C. Assessment of advanced glycation end-products as a biomarker of diabetic outcomes. ACTA ACUST UNITED AC 2018; 65:540-545. [PMID: 30077632 DOI: 10.1016/j.endinu.2018.06.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 06/05/2018] [Accepted: 06/05/2018] [Indexed: 12/21/2022]
Abstract
There are substantial differences in the onset and severity of diabetes complications that are not fully explained by HbA1c levels and other risk factors. HbA1c is the gold standard for assessing metabolic control, but has limited value to identify patients at risk of developing diabetic complications. The main disadvantage of HbA1c is that it does not provide information about glycemic variability and does not reflect long-term exposure to hyperglycemia. One of the main pathogenetic mechanisms of diabetic complications is the generation and accumulation of advanced glycation end-products (AGEs). Based on its fluorescence properties, AGEs may be measured in tissues such as the skin or lens. These non-invasive measurements of AGE accumulation may be considered as promising biomarkers of late diabetic complications, and our objective is to summarize the available evidence supporting this statement. However, further translational research and prospective clinical trials are needed before these new biomarkers may be incorporated into clinical practice.
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Affiliation(s)
- Olga Simó-Servat
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute Barcelona, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain.
| | - Alejandra Planas
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute Barcelona, Spain
| | - Andreea Ciudin
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute Barcelona, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
| | - Rafael Simó
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute Barcelona, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
| | - Cristina Hernández
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute Barcelona, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Spain
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Brinkley TE, Leng X, Nicklas BJ, Kritchevsky SB, Ding J, Kitzman DW, Hundley WG. Racial differences in circulating levels of the soluble receptor for advanced glycation endproducts in middle-aged and older adults. Metabolism 2017; 70:98-106. [PMID: 28403949 PMCID: PMC5396843 DOI: 10.1016/j.metabol.2017.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 02/03/2017] [Accepted: 02/05/2017] [Indexed: 12/11/2022]
Abstract
BACKGROUND Low levels of the soluble receptor for advanced glycation endproducts (sRAGE) have been implicated in a number of chronic diseases. Previous studies indicate that sRAGE levels are ~30% lower in Blacks compared to Whites. However, the reasons for these differences are unclear. PURPOSE We aimed to identify predictors of circulating sRAGE biomarkers among Black and White adults at high cardiac risk. METHODS Serum levels of total sRAGE, endogenous secretory RAGE (esRAGE), carboxymethyl-lysine (CML, a major RAGE ligand), and their ratios were measured in 99 Blacks and 454 Whites. RESULTS Blacks had a more adverse cardiovascular risk profile, as well as lower median levels of total sRAGE (972 vs. 1564pg/ml) and esRAGE (474 vs. 710pg/ml) compared to Whites (p<0.0001). In addition, the proportion of esRAGE was higher in Blacks (47% vs. 44%, p=0.02), as were the CML/total sRAGE (0.89 vs. 0.56ng/pg) and CML/esRAGE (1.72 vs. 1.20ng/pg) ratios (p<0.0001). Racial differences persisted after adjustment for key covariates including age, gender, tobacco use, comorbidities, BMI, blood pressure, glucose, insulin, triglycerides, C-reactive protein, and renal function (p<0.05). Race alone accounted for nearly half of the variability in total sRAGE levels (10.6%; model explained 23.9%). In stratified analyses, gender and heart rate were independently associated with total sRAGE and esRAGE in Whites, while CML and C-reactive protein were associated with total sRAGE in Blacks. CONCLUSIONS We identified several independent predictors of sRAGE biomarkers. Notably, Black race was associated with an adverse AGE/RAGE profile, including lower sRAGE and higher CML/sRAGE ratios.
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Affiliation(s)
- Tina E Brinkley
- Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC.
| | - Xiaoyan Leng
- Department of Biostatistical Sciences, Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC
| | - Barbara J Nicklas
- Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC
| | - Stephen B Kritchevsky
- Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC
| | - Jingzhong Ding
- Department of Internal Medicine, Section on Gerontology and Geriatric Medicine, Wake Forest School of Medicine, Winston-Salem, NC
| | - Dalane W Kitzman
- Department of Internal Medicine, Section on Cardiology, Wake Forest School of Medicine, Winston-Salem, NC
| | - W Gregory Hundley
- Department of Internal Medicine, Section on Cardiology, Wake Forest School of Medicine, Winston-Salem, NC
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Abstract
Diabetic retinopathy (DR), a leading cause of acquired vision loss, is a microvascular complication of diabetes. While traditional risk factors for diabetic retinopathy including longer duration of diabetes, poor blood glucose control, and dyslipidemia are helpful in stratifying patient's risk for developing retinopathy, many patients without these traditional risk factors develop DR; furthermore, there are persons with long diabetes duration who do not develop DR. Thus, identifying biomarkers to predict DR or to determine therapeutic response is important. A biomarker can be defined as a characteristic that is objectively measured and evaluated as an indicator of normal biological processes, pathogenic processes, or pharmacologic responses to a therapeutic intervention. Incorporation of biomarkers into risk stratification of persons with diabetes would likely aid in early diagnosis and guide treatment methods for those with DR or with worsening DR. Systemic biomarkers of DR include serum measures including genomic, proteomic, and metabolomics biomarkers. Ocular biomarkers including tears and vitreous and retinal vascular structural changes have also been studied extensively to prognosticate the risk of DR development. The current studies on biomarkers are limited by the need for larger sample sizes, cross-validation in different populations and ethnic groups, and time-efficient and cost-effective analytical techniques. Future research is important to explore novel DR biomarkers that are non-invasive, rapid, economical, and accurate to help reduce the incidence and progression of DR in people with diabetes.
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Affiliation(s)
- Daniel Shu Wei Ting
- Singapore National Eye Center, 11 Third Hospital Avenue, Singapore, 168751, Singapore
- Singapore Eye Research Institute, Singapore, Singapore
- Duke-NUS Medical School, National University of Singapore, Singapore, Singapore
| | - Kara-Anne Tan
- Singapore National Eye Center, 11 Third Hospital Avenue, Singapore, 168751, Singapore
| | - Val Phua
- Singapore National Eye Center, 11 Third Hospital Avenue, Singapore, 168751, Singapore
| | - Gavin Siew Wei Tan
- Singapore National Eye Center, 11 Third Hospital Avenue, Singapore, 168751, Singapore
- Singapore Eye Research Institute, Singapore, Singapore
- Duke-NUS Medical School, National University of Singapore, Singapore, Singapore
| | - Chee Wai Wong
- Singapore National Eye Center, 11 Third Hospital Avenue, Singapore, 168751, Singapore
- Singapore Eye Research Institute, Singapore, Singapore
- Duke-NUS Medical School, National University of Singapore, Singapore, Singapore
| | - Tien Yin Wong
- Singapore National Eye Center, 11 Third Hospital Avenue, Singapore, 168751, Singapore.
- Singapore Eye Research Institute, Singapore, Singapore.
- Duke-NUS Medical School, National University of Singapore, Singapore, Singapore.
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Luft VC, Duncan BB, Schmidt MI, Chambless LE, Pankow JS, Hoogeveen RC, Couper DJ, Heiss G. Carboxymethyl lysine, an advanced glycation end product, and incident diabetes: a case-cohort analysis of the ARIC Study. Diabet Med 2016; 33:1392-8. [PMID: 26359784 PMCID: PMC4929039 DOI: 10.1111/dme.12963] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 09/08/2015] [Indexed: 12/12/2022]
Abstract
AIMS To verify whether elevated fasting levels of circulating carboxymethyl lysine (CML), an advanced glycation end product, predict the development of diabetes in middle-age adults. METHODS Using a stratified case-cohort design, we followed 543 middle-aged individuals who developed diabetes and 514 who did not over a median 9 years in the Atherosclerosis Risk in Communities Study. Weighted Cox proportional hazards analyses were used to account for the design. RESULTS In weighted analyses, correlation between CML levels and anthropometric, inflammatory or metabolic variables was minimal (Pearson correlations usually < 0.10). CML, when modelled as a continuous variable and after adjustment for age, sex, race, centre, parental history of diabetes, BMI, waist-to-hip ratio, non-esterified fatty acids, oxidized LDL-cholesterol, GFR, smoking, an inflammation score, adiponectin, leptin, insulin and glucose levels, was associated with an increased risk of diabetes [Hazard ratio (HR) = 1.35; 95% confidence interval (CI) 1.09-1.67, for each 100 ng/ml CML increment]. Baseline glucose level and race each modified the association (P < 0.05 for interaction), which was present only among those with impaired fasting glucose (≥ 5.6 mmol/l, HR = 1.61, 95% CI 1.26-2.05) and among white participants (HR = 1.50, 95% CI 1.13-1.99). CONCLUSIONS Elevated fasting CML, after adjustment for multiple risk factors for diabetes, predicts the development of incident diabetes, the association being present among those with impaired fasting glucose and in white participants. These prospective findings suggest that advanced glycation end products might play a role in the development of diabetes.
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Affiliation(s)
- V C Luft
- Graduate Studies Program in Epidemiology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
- Food and Nutrition Research Centre, Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.
| | - B B Duncan
- Graduate Studies Program in Epidemiology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
- Department of Epidemiology, Chapel Hill, NC, USA
| | - M I Schmidt
- Graduate Studies Program in Epidemiology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
- Department of Epidemiology, Chapel Hill, NC, USA
| | - L E Chambless
- Department of Epidemiology, Chapel Hill, NC, USA
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, USA
| | - J S Pankow
- Division of Epidemiology & Community Health, School of Public Health, University of Minnesota, Minneapolis, MN, USA
| | - R C Hoogeveen
- Department of Medicine, Baylor College of Medicine, Houston, TX, USA
| | - D J Couper
- Department of Biostatistics, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, USA
| | - G Heiss
- Department of Epidemiology, Chapel Hill, NC, USA
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Halstrom A, MacDonald E, Neil C, Arendts G, Fatovich D, Fitzgerald M. Elevation of oxidative stress indicators in a pilot study of plasma following traumatic brain injury. J Clin Neurosci 2016; 35:104-108. [PMID: 27697434 DOI: 10.1016/j.jocn.2016.09.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 09/15/2016] [Indexed: 12/11/2022]
Abstract
Traumatic brain injury (TBI) encompasses a broad range of injury mechanisms and severity. A detailed determination of TBI severity can be a complex challenge, with current clinical tools sometimes insufficient to tailor a clinical response to a spectrum of patient needs. Blood biomarkers of TBI may supplement clinical assessments but currently available biomarkers have limited sensitivity and specificity. While oxidative stress is known to feature in damage mechanisms following TBI, investigation of blood biomarkers of oxidative stress has been limited. This exploratory pilot study of a subset of 18 trauma patients with TBI of varying severity, quantifies circulating concentrations of the structural damage indicators S100b, and myelin basic protein (MBP), and the biomarkers of oxidative stress hydroxynonenal (HNE), malondialdehyde (MDA), carboxy-methyl-lysine (CML), and 8-hydroxy-2'-deoxy-guanosine (8-OHDG). Significant increases in circulating S100b, MBP, and HNE were observed in TBI patient samples compared to 8 uninjured controls, and there was a significant decrease in CML. This small exploratory study supports the current literature on S100b and MBP elevation in TBI, and reveals potential for the use of peripheral oxidative stress markers to assist in determination of TBI severity. Further investigation is required to validate results and confirm trends.
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Affiliation(s)
- Alison Halstrom
- Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Perth 6009, Western Australia, Australia.
| | - Ellen MacDonald
- Emergency Medicine, Royal Perth Hospital, The University of Western Australia, Perth, Western Australia, Australia; Centre for Clinical Research in Emergency Medicine, Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia.
| | - Claire Neil
- Centre for Clinical Research in Emergency Medicine, Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia.
| | - Glenn Arendts
- Emergency Medicine, Royal Perth Hospital, The University of Western Australia, Perth, Western Australia, Australia; Centre for Clinical Research in Emergency Medicine, Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia.
| | - Daniel Fatovich
- Centre for Clinical Research in Emergency Medicine, Harry Perkins Institute of Medical Research, Perth, Western Australia, Australia.
| | - Melinda Fitzgerald
- Experimental and Regenerative Neurosciences, School of Animal Biology, The University of Western Australia, Perth 6009, Western Australia, Australia.
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Simó-Servat O, Simó R, Hernández C. Circulating Biomarkers of Diabetic Retinopathy: An Overview Based on Physiopathology. J Diabetes Res 2016; 2016:5263798. [PMID: 27376090 PMCID: PMC4916280 DOI: 10.1155/2016/5263798] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Accepted: 05/18/2016] [Indexed: 12/21/2022] Open
Abstract
Diabetic retinopathy (DR) is the main cause of working-age adult-onset blindness. The currently available treatments for DR are applicable only at advanced stages of the disease and are associated with significant adverse effects. In early stages of DR the only therapeutic strategy that physicians can offer is a tight control of the risk factors for DR. Therefore, new pharmacological treatments for these early stages of the disease are required. In order to develop therapeutic strategies for early stages of DR new diagnostic tools are urgently needed. In this regard, circulating biomarkers could be useful to detect early disease, to identify those diabetic patients most prone to progressive worsening who ought to be followed up more often and who could obtain the most benefit from these therapies, and to monitor the effectiveness of new drugs for DR before more advanced DR stages have been reached. Research of biomarkers for DR has been mainly based on the pathogenic mechanism involved in the development of DR (i.e., AGEs, oxidative stress, endothelial dysfunction, inflammation, and proangiogenic factors). This review focuses on circulating biomarkers at both early and advanced stages that could be relevant for the prediction or detection of DR.
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Affiliation(s)
- Olga Simó-Servat
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
| | - Rafael Simó
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
| | - Cristina Hernández
- Diabetes and Metabolism Research Unit, Vall d'Hebron Research Institute, Universitat Autònoma de Barcelona, Barcelona, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salud Carlos III (ISCIII), Barcelona, Spain
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30
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Pusparajah P, Lee LH, Abdul Kadir K. Molecular Markers of Diabetic Retinopathy: Potential Screening Tool of the Future? Front Physiol 2016; 7:200. [PMID: 27313539 PMCID: PMC4887489 DOI: 10.3389/fphys.2016.00200] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 05/17/2016] [Indexed: 12/13/2022] Open
Abstract
Diabetic retinopathy (DR) is among the leading causes of new onset blindness in adults. Effective treatment may delay the onset and progression of this disease provided it is diagnosed early. At present retinopathy can only be diagnosed via formal examination of the eye by a trained specialist, which limits the population that can be effectively screened. An easily accessible, reliable screening biomarker of diabetic retinopathy would be of tremendous benefit in detecting the population in need of further assessment and treatment. This review highlights specific biomarkers that show promise as screening markers to detect early diabetic retinopathy or even to detect patients at increased risk of DR at the time of diagnosis of diabetes. The pathobiology of DR is complex and multifactorial giving rise to a wide array of potential biomarkers. This review provides an overview of these pathways and looks at older markers such as advanced glycation end products (AGEs), inflammatory markers, vascular endothelial growth factor (VEGF) as well as other newer proteins with a role in the pathogenesis of DR including neuroprotective factors such as brain derived neurotrophic factor (BDNF) and Pigment Epithelium Derived Factor (PEDF); SA100A12, pentraxin 3, brain natriuretic peptide, apelin 3, and chemerin as well as various metabolites such as lipoprotein A, folate, and homocysteine. We also consider the possible role of proteins identified through proteomics work whose levels are altered in the sera of patients with DR as screening markers though their role in pathophysiology remains to be characterized. The role of microRNA as a promising new screening marker is also discussed.
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Affiliation(s)
- Priyia Pusparajah
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia Bandar Sunway, Malaysia
| | - Learn-Han Lee
- School of Pharmacy, Monash University MalaysiaBandar Sunway, Malaysia; Center of Health Outcomes Research and Therapeutic Safety (Cohorts), School of Pharmaceutical Sciences, University of PhayaoPhayao, Thailand
| | - Khalid Abdul Kadir
- Jeffrey Cheah School of Medicine and Health Sciences, Monash University Malaysia Bandar Sunway, Malaysia
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Mishra N, Saxena S, Shukla RK, Singh V, Meyer CH, Kruzliak P, Khanna VK. Association of serum N(ε)-Carboxy methyl lysine with severity of diabetic retinopathy. J Diabetes Complications 2016; 30:511-7. [PMID: 26782022 DOI: 10.1016/j.jdiacomp.2015.12.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 11/21/2015] [Accepted: 12/09/2015] [Indexed: 11/29/2022]
Abstract
PURPOSE To correlate serum levels of N-epsilon-carboxy methyl lysine (N(ε)-CML) with severity of retinopathy, in vivo macular edema and disruption of external limiting membrane (ELM) and photoreceptor ellipsoid zone in type 2 diabetes mellitus (DM). METHODS Consecutive cases of type 2 DM [diabetes mellitus with no retinopathy (No DR) (n=20); non- proliferative diabetic retinopathy (NPDR) with diabetic macular edema (n=20); proliferative diabetic retinopathy with diabetic macular edema (PDR) (n=20)] and healthy controls (n=20) between the ages of 40 and 65 years were included (power of study=93.8%). In vivo histology of retinal layers was assessed using spectral domain optical coherence tomography. Every study subject underwent macular thickness analysis using the macular cube 512×128 feature. Disruption of ELM and photoreceptor ellipsoid zone was graded: grade 0, no disruption of ELM and ellipsoid zone; grade 1, ELM disrupted and ellipsoid zone intact; grade 2, both ELM and ellipsoid zone disrupted. Data were statistically analyzed. RESULTS The mean levels of N(ε)-CML were 31.34±21.23 ng/ml, 73.88±35.01 ng/ml, 91.21±66.65 ng/ml, and 132.08±84.07 ng/ml in control, No DR, NPDR and PDR respectively. N(ε)-CML level was significantly different between the study groups (control, No DR, NPDR and PDR) (p<0.001). Mean logMAR visual acuity decreased with increased levels of N(ε)-CML (p<0.001). The association of N(Ɛ)CML with the grades of disruption was found to be statistically significant (F value=18.48, p<0.001). Univariate analysis was done with N(Ɛ)-CML as a dependent variable. The values of N(Ɛ)-CML were normalized (log10) and were subjected to univariate analysis with fasting blood glucose level, glycosylated hemoglobin, central subfield macular thickness and cube average thickness among the diseased groups (NPDR and PDR) that act as confounders. It was found that none of the variables had significant effect on N(Ɛ)-CML (fasting blood glucose p=0.12, HBA1c p=0.65, central subfield macular thickness p=0.13, cube average thickness p=0.19). N(Ɛ)-CML tends to be a significant and important predictor of grade of ELM and ellipsoid zone disruption in diabetic retinopathy. CONCLUSIONS Increased N(ε)-CML levels are associated with increased severity of diabetic retinopathy, macular edema and structural changes in macula that is ELM and ellipsoid zone disruption, which serves as a prognosticator of visual outcome.
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Affiliation(s)
- Nibha Mishra
- Department of Ophthalmology, King George's Medical University, Lucknow, India
| | - Sandeep Saxena
- Department of Ophthalmology, King George's Medical University, Lucknow, India.
| | - Rajendra K Shukla
- Developmental Toxicology Division, CSIR- Indian Institute of Toxicology Research, Lucknow, India
| | - Vinita Singh
- Department of Ophthalmology, King George's Medical University, Lucknow, India
| | - Carsten H Meyer
- Department of Ophthalmology, Pallas Klinik, Olten, Switzerland
| | - Peter Kruzliak
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Comenius University, Bratislava, Slovak Republic; 2nd Department of Internal Medicine, St. Anne´s University Hospital and Masaryk University, Brno, Czech Republic.
| | - Vinay K Khanna
- Developmental Toxicology Division, CSIR- Indian Institute of Toxicology Research, Lucknow, India
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Bartakova V, Kollarova R, Kuricova K, Sebekova K, Belobradkova J, Kankova K. Serum carboxymethyl-lysine, a dominant advanced glycation end product, is increased in women with gestational diabetes mellitus. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2016; 160:70-5. [DOI: 10.5507/bp.2015.045] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 09/10/2015] [Indexed: 11/23/2022] Open
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Advanced Glycation End Products Induce Obesity and Hepatosteatosis in CD-1 Wild-Type Mice. BIOMED RESEARCH INTERNATIONAL 2016; 2016:7867852. [PMID: 26942201 PMCID: PMC4753052 DOI: 10.1155/2016/7867852] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 01/10/2016] [Indexed: 12/31/2022]
Abstract
AGEs are a heterogeneous group of molecules formed from the nonenzymatic reaction of reducing sugars with free amino groups of proteins, lipids, and/or nucleic acids. AGEs have been shown to play a role in various conditions including cardiovascular disease and diabetes. In this study, we hypothesized that AGEs play a role in the “multiple hit hypothesis” of nonalcoholic fatty liver disease (NAFLD) and contribute to the pathogenesis of hepatosteatosis. We measured the effects of various mouse chows containing high or low AGE in the presence of high or low fat content on mouse weight and epididymal fat pads. We also measured the effects of these chows on the inflammatory response by measuring cytokine levels and myeloperoxidase activity levels on liver supernatants. We observed significant differences in weight gain and epididymal fat pad weights in the high AGE-high fat (HAGE-HF) versus the other groups. Leptin, TNF-α, IL-6, and myeloperoxidase (MPO) levels were significantly higher in the HAGE-HF group. We conclude that a diet containing high AGEs in the presence of high fat induces weight gain and hepatosteatosis in CD-1 mice. This may represent a model to study the role of AGEs in the pathogenesis of hepatosteatosis and steatohepatitis.
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Awasthi S, Saraswathi NT. Non-enzymatic glycation mediated structure–function changes in proteins: case of serum albumin. RSC Adv 2016. [DOI: 10.1039/c6ra08283a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Albumin, a major plasma protein with extraordinary ligand binding properties, transports various ligands ranging from drugs, hormones, fatty acids, and toxins to different tissues and organs in the body.
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Affiliation(s)
- Saurabh Awasthi
- Molecular Biophysics Lab
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613401
- India
| | - N. T. Saraswathi
- Molecular Biophysics Lab
- School of Chemical and Biotechnology
- SASTRA University
- Thanjavur-613401
- India
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Skin collagen pentosidine and fluorescence in diabetes were predictors of retinopathy progression and creatininemia increase already 6years after punch-biopsy. Clin Biochem 2015; 49:225-31. [PMID: 26506116 DOI: 10.1016/j.clinbiochem.2015.10.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 09/30/2015] [Accepted: 10/14/2015] [Indexed: 11/21/2022]
Abstract
OBJECTIVE Advanced glycation end products (AGEs) of collagens appear to contribute to microvascular complications in diabetes. Do high concentrations of AGEs in skin collagen predict accelerated progression of these complications after 6 years and indicate the need for tighter anti-diabetic treatment? DESIGN AND METHODS We measured two AGE parameters in collagen extracted from skin punch-biopsies: pentosidine and fluorescence at 370/440nm, as markers and predictors of microvascular complications, in 30 patients with diabetes (14 type-1, 16 type-2) without renal insufficiency, and in age- and gender-matched normoglycemic controls, followed at Hôtel-Dieu in Paris. RESULTS At the time of biopsy, marked increases in pentosidine (p=0.0014) and fluorescence (p=0.0001) expressed per collagen hydroxyproline, were found in the patients with diabetes versus the controls. A significant effect of age was found for pentosidine, but not fluorescence, measurements in the normoglycemic controls. Therefore pentosidine but not fluorescence results were corrected for age in the patients. Pentosidine and fluorescence were correlated with diabetes duration. Fluorescence was significantly dependent on retinopathy presence and score in type-1 and type-2 diabetes, whereas pentosidine was not. Fluorescence was correlated with microalbuminuria only in type-1 diabetes. Neither fluorescence nor pentosidine were correlated with creatininemia. Already six years after biopsy, retinopathy score progression and creatininemia increase were significantly correlated with initial pentosidine and fluorescence measurements. CONCLUSIONS These AGEs are good predictors of progression of microvascular complications and appear to be pathogenic. High skin concentrations of AGEs should induce tighter anti-diabetic treatment.
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Semba RD, Sun K, Schwartz AV, Varadhan R, Harris TB, Satterfield S, Garcia M, Ferrucci L, Newman AB. Serum carboxymethyl-lysine, an advanced glycation end product, is associated with arterial stiffness in older adults. J Hypertens 2015; 33:797-803; discussion 803. [PMID: 25915884 PMCID: PMC4458067 DOI: 10.1097/hjh.0000000000000460] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE The objective of this study is to examine the relationship of serum carboxymethyl-lysine (CML), an advanced glycation end product (AGE), with pulse pressure (PP), aortic pulse wave velocity (aPWV) and hypertension in older adults. BACKGROUND AGEs are bioactive molecules that accumulate in tissues with ageing and can both cross-link collagen and induce inflammation in model systems. The relationship of AGEs with arterial stiffness and hypertension has not been well characterized in community-dwelling older adults. METHODS We measured serum CML and blood pressure in 3044 adults, aged 70-79 years, who participated in the Health, Aging and Body Composition Study, a population-based study of ageing in Pittsburgh, Pennsylvania and Memphis, Tennessee. aPWV was measured in 2468 participants. RESULTS Participants in the highest tertile of serum CML had higher PP (highest tertile: beta = 2.85, SE = 0.82, P = 0.0005; middle tertile: beta = 0.60, SE = 0.80, P = 0.45), and higher aPWV (highest tertile: beta = 51.4, SE = 20.1, P = 0.01; middle tertile: beta = 3.2, SE = 19.8, P = 0.87) than those in the lowest tertile in multivariable linear regression models adjusting for age, sex, race, education, BMI, smoking, alcohol use, total cholesterol, high-density lipoprotein (HDL) cholesterol, diabetes, cardiovascular disease and chronic kidney disease. Participants in the highest and middle tertiles of serum CML had higher odds of hypertension [odds ratio (OR) 1.32, 95% confidence interval (95% CI) 1.06-1.60, P = 0.005; OR 1.27, 95% CI 1.05-1.53, P = 0.01, respectively] than those in the lowest tertile in a multivariable logistic regression model adjusting for the same covariates. CONCLUSION Elevated serum CML was associated with arterial stiffness, as reflected by higher PP and aPWV, in older, community-dwelling adults.
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Affiliation(s)
- Richard D Semba
- aDepartment of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, Maryland bDepartment of Epidemiology and Biostatistics, University of California, San Francisco, San Francisco, California cDivision of Biostatistics and Bioinformatics, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University, Baltimore dLaboratory of Epidemiology and Population Sciences, National Institute on Aging, National Institutes of Health, Rockville, Maryland eDepartment of Preventive Medicine, University of Tennessee, Memphis, Tennessee fNational Institute on Aging, Baltimore, Maryland gDepartment of Epidemiology, University of Pittsburgh Graduate School of Public Health, Pittsburgh, Pennsylvania, USA
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Nowotny K, Jung T, Höhn A, Weber D, Grune T. Advanced glycation end products and oxidative stress in type 2 diabetes mellitus. Biomolecules 2015; 5:194-222. [PMID: 25786107 PMCID: PMC4384119 DOI: 10.3390/biom5010194] [Citation(s) in RCA: 661] [Impact Index Per Article: 73.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 02/06/2015] [Accepted: 03/02/2015] [Indexed: 12/25/2022] Open
Abstract
Type 2 diabetes mellitus (T2DM) is a very complex and multifactorial metabolic disease characterized by insulin resistance and β cell failure leading to elevated blood glucose levels. Hyperglycemia is suggested to be the main cause of diabetic complications, which not only decrease life quality and expectancy, but are also becoming a problem regarding the financial burden for health care systems. Therefore, and to counteract the continually increasing prevalence of diabetes, understanding the pathogenesis, the main risk factors, and the underlying molecular mechanisms may establish a basis for prevention and therapy. In this regard, research was performed revealing further evidence that oxidative stress has an important role in hyperglycemia-induced tissue injury as well as in early events relevant for the development of T2DM. The formation of advanced glycation end products (AGEs), a group of modified proteins and/or lipids with damaging potential, is one contributing factor. On the one hand it has been reported that AGEs increase reactive oxygen species formation and impair antioxidant systems, on the other hand the formation of some AGEs is induced per se under oxidative conditions. Thus, AGEs contribute at least partly to chronic stress conditions in diabetes. As AGEs are not only formed endogenously, but also derive from exogenous sources, i.e., food, they have been assumed as risk factors for T2DM. However, the role of AGEs in the pathogenesis of T2DM and diabetic complications—if they are causal or simply an effect—is only partly understood. This review will highlight the involvement of AGEs in the development and progression of T2DM and their role in diabetic complications.
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Affiliation(s)
- Kerstin Nowotny
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany.
| | - Tobias Jung
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany.
| | - Annika Höhn
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany.
| | - Daniela Weber
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany.
| | - Tilman Grune
- Department of Molecular Toxicology, German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, 14558 Nuthetal, Germany.
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Sharma Y, Saxena S, Saxena A, Mishra A, Natu SM. Interrelationship of elevated serum Advanced Glycation End-product levels and malnutrition (Subjective Global Assessment) scores with the severity of retinopathy in type II diabetes. Clin Nutr ESPEN 2015; 10:e42-e48. [PMID: 28531446 DOI: 10.1016/j.clnesp.2014.12.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 11/03/2014] [Accepted: 12/16/2014] [Indexed: 01/12/2023]
Abstract
BACKGROUND AND AIMS Hyperglycemia in diabetes causes endogenous formation of Advanced Glycation End-products (AGEs) which accumulate in various body parts including retina causing diabetic retinopathy. AGEs also originate from exogenous dietary sources contributing to the body's AGE pool. Currently, curing of diabetic retinopathy is mainly focused on medication, surgical or laser interventions and not much emphasis is given on preventing or halting its occurrence or advancement to more severe stages, nutritionally. Planning a 'low glycemic index-low AGE' diet therapy for diabetic subjects can reduce endogenous and exogenous origin AGEs in the body and help in controlling retinopathy. Sound and accurate assessment of nutritional status is a crucial step for planning a therapeutic diet for this condition. As this aspect has not gained sufficient attention till now we are assessing the association of serum Advanced Glycation End-product (AGE) levels with the severity of diabetic retinopathy and for the first time estimating the nutritional status of subjects with this eye disorder for long term patient care. METHODS This was a tertiary care centre-based, case-control study involving sixty three consecutive cases with diabetes divided as 21 cases with diabetes but no retinopathy, 21 cases with non proliferative diabetic retinopathy (NPDR), 21 cases with proliferative diabetic retinopathy (PDR) along with 21 healthy controls. Serum AGE levels of all the cases and controls were evaluated by Enzyme Linked Immuno Sorbent Assay (ELISA) and nutritional status was assessed by anthropometric measurements and SGA scores. RESULTS Serum AGE levels were found significantly elevated in PDR group when compared with no retinopathy (p < 0.05) and control (p < 0.001) group. Control group was also significantly different from (p < 0.05) from NPDR group. Increase in SGA scores was statistically significant amongst the four study groups though other indices of nutritional status showed no definite trend with the increasing severity of retinopathy. CONCLUSION Our study shows that serum AGE levels are potential risk markers of diabetic retinopathy and SGA can be used as a regular tool for the assessment of nutritional status of diabetic retinopathy subjects which will help planning a 'low glycemic index-low AGE' therapeutic diet for halting this morbidity.
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Affiliation(s)
- Yashodhara Sharma
- Department of Ophthalmology, King George Medical University, Lucknow, Uttar Pradesh, India.
| | - Sandeep Saxena
- Department of Ophthalmology, King George Medical University, Lucknow, Uttar Pradesh, India
| | - Anita Saxena
- Department of Nephrology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
| | - Arvind Mishra
- Department of Medicine, King George Medical University, Lucknow, Uttar Pradesh, India
| | - Shankar Madhav Natu
- Department of Pathology, King George Medical University, Lucknow, Uttar Pradesh, India
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Chen SJ, Aikawa C, Matsui T. Quantitative Analysis of Methylglyoxal, Glyoxal and Free Advanced Glycation End-Products in the Plasma of Wistar Rats during the Oral Glucose Tolerance Test. Biol Pharm Bull 2015; 38:336-9. [DOI: 10.1248/bpb.b14-00698] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Si Jing Chen
- Division of Bioscience and Bioenvironmental Sciences, Faculty of Agriculture, Graduate School of Kyushu University
| | - Chiwa Aikawa
- Division of Bioscience and Bioenvironmental Sciences, Faculty of Agriculture, Graduate School of Kyushu University
| | - Toshiro Matsui
- Division of Bioscience and Bioenvironmental Sciences, Faculty of Agriculture, Graduate School of Kyushu University
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Jiao L, Stolzenberg-Solomon R, Zimmerman TP, Duan Z, Chen L, Kahle L, Risch A, Subar AF, Cross AJ, Hollenbeck A, Vlassara H, Striker G, Sinha R. Dietary consumption of advanced glycation end products and pancreatic cancer in the prospective NIH-AARP Diet and Health Study. Am J Clin Nutr 2015; 101:126-34. [PMID: 25527756 PMCID: PMC4266882 DOI: 10.3945/ajcn.114.098061] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Advanced glycation end products (AGEs) are a heterogeneous group of compounds present in uncooked foods as well as in foods cooked at high temperatures. AGEs have been associated with insulin resistance, oxidative stress, and chronic inflammation in patients with diabetes. Dietary AGEs are an important contributor to the AGE pool in the body. N(ϵ)-(carboxymethyl)lysine (CML) AGE is one of the major biologically and chemically well-characterized AGE markers. The consumption of red meat, which is CML-AGE rich, has been positively associated with pancreatic cancer in men. OBJECTIVES With the use of a published food CML-AGE database, we estimated the consumption of CML AGE in the prospective NIH-AARP Diet and Health Study and evaluated the association between CML-AGE consumption and pancreatic cancer and the mediating effect of CML AGE on the association between red meat consumption and pancreatic cancer. DESIGN Multivariate Cox proportional hazard regression models were used to estimate HRs and 95% CIs for pancreatic cancer. RESULTS During an average of 10.5 y of follow-up, we identified 2193 pancreatic cancer cases (1407 men and 786 women) from 528,251 subjects. With the comparison of subjects in the fifth and the first quintiles of CML-AGE consumption, we observed increased pancreatic cancer risk in men (HR: 1.43; 95% CI: 1.06, 1.93, P-trend = 0.003) but not women (HR: 1.14; 95% CI: 0.76, 1.72, P-trend = 0.42). Men in the highest quintile of red meat consumption had higher risk of pancreatic cancer (HR: 1.35; 95% CI: 1.07, 1.70), which attenuated after adjustment for CML-AGE consumption (HR: 1.20; 95% CI: 0.95, 1.53). CONCLUSION Dietary CML-AGE consumption was associated with modestly increased risk of pancreatic cancer in men and may partially explain the positive association between red meat and pancreatic cancer.
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Affiliation(s)
- Li Jiao
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Rachael Stolzenberg-Solomon
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Thea Palmer Zimmerman
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Zhigang Duan
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Liang Chen
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Lisa Kahle
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Adam Risch
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Amy F Subar
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Amanda J Cross
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Albert Hollenbeck
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Helen Vlassara
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Gary Striker
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
| | - Rashmi Sinha
- From the Sections of Gastroenterology and Hepatology (LJ and LC) and Health Services Research (LJ, ZD, and LC), Department of Medicine, Baylor College of Medicine, Houston, TX; the Nutritional Epidemiology Branch, Division of Cancer Epidemiology and Genetics (RS-S and RS) and the Applied Research Program, Division of Cancer Control and Population Sciences (AFS), National Cancer Institute, NIH, Rockville, MD; Westat, Rockville, MD (TPZ); Information Management Services, Rockville, MD (LK and AR); the Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College London, London, United Kingdom (AJC); the Division of Experimental Diabetes and Aging, Mount Sinai School of Medicine, New York, NY (HV and GS); and AARP, Washington, DC (AH)
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Kellow NJ, Coughlan MT, Savige GS, Reid CM. Effect of dietary prebiotic supplementation on advanced glycation, insulin resistance and inflammatory biomarkers in adults with pre-diabetes: a study protocol for a double-blind placebo-controlled randomised crossover clinical trial. BMC Endocr Disord 2014; 14:55. [PMID: 25011647 PMCID: PMC4099169 DOI: 10.1186/1472-6823-14-55] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 06/30/2014] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Advanced glycation endproducts (AGEs) contribute to the development of vascular complications of diabetes and have been recently implicated in the pathogenesis of diabetes. Since AGEs are generated within foodstuffs upon food processing, it is increasingly recognised that the modern diet is replete with AGEs. AGEs are thought to stimulate chronic low-grade inflammation and promote oxidative stress and have been linked to the development of insulin resistance. Simple therapeutic strategies targeted at attenuating the progression of chronic low-grade inflammation and insulin resistance are urgently required to prevent or slow the development of type 2 diabetes in susceptible individuals. Dietary modulation of the human colonic microbiota has been shown to confer a number of health benefits to the host, but its effect on advanced glycation is unknown. The aim of this article is to describe the methodology of a double-blind placebo-controlled randomised crossover trial designed to determine the effect of 12 week consumption of a prebiotic dietary supplement on the advanced glycation pathway, insulin sensitivity and chronic low-grade inflammation in adults with pre-diabetes. METHODS/DESIGN Thirty adults with pre-diabetes (Impaired Glucose Tolerance or Impaired Fasting Glucose) aged between 40-60 years will be randomly assigned to receive either 10 grams of prebiotic (inulin/oligofructose) daily or 10 grams placebo (maltodextrin) daily for 12 weeks. After a 2-week washout period, study subjects will crossover to receive the alternative dietary treatment for 12 weeks. The primary outcome is the difference in markers of the advanced glycation pathway carboxymethyllysine (CML) and methylglyoxal (MG) between experimental and control treatments. Secondary outcomes include HbA1c, insulin sensitivity, lipid levels, blood pressure, serum glutathione, adiponectin, IL-6, E-selectin, myeloperoxidase, C-reactive protein, Toll-like Receptor 4 (TLR4), soluble receptor for AGE (sRAGE), urinary 8-isoprostanes, faecal bacterial composition and short chain fatty acid profile. Anthropometric measures including BMI and waist circumference will be collected in addition to comprehensive dietary and lifestyle data. DISCUSSION Prebiotics which selectively stimulate the growth of beneficial bacteria in the human colon might offer protection against AGE-related pathology in people at risk of developing type 2 diabetes. TRIAL REGISTRATION Australia and New Zealand Clinical Trials Register (ANZCTR): ACTRN12613000130763.
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Affiliation(s)
- Nicole J Kellow
- Department of Epidemiology & Preventive Medicine, School of Public Health & Preventive Medicine, Monash University, The Alfred Centre, Melbourne, Victoria 3004, Australia
| | - Melinda T Coughlan
- Glycation, Nutrition & Metabolism Laboratory, Baker IDI Heart & Diabetes Institute, Melbourne, Victoria 8008, Australia
- Department of Medicine, Central Clinical School, Monash University, Alfred Medical Research & Education Precinct, Melbourne, Victoria 3004, Australia
| | - Gayle S Savige
- Department of Epidemiology & Preventive Medicine, School of Public Health & Preventive Medicine, Monash University, The Alfred Centre, Melbourne, Victoria 3004, Australia
| | - Christopher M Reid
- Department of Epidemiology & Preventive Medicine, School of Public Health & Preventive Medicine, Monash University, The Alfred Centre, Melbourne, Victoria 3004, Australia
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Semba RD, Gebauer SK, Baer DJ, Sun K, Turner R, Silber HA, Talegawkar S, Ferrucci L, Novotny JA. Dietary intake of advanced glycation end products did not affect endothelial function and inflammation in healthy adults in a randomized controlled trial. J Nutr 2014; 144:1037-42. [PMID: 24744309 PMCID: PMC4056644 DOI: 10.3945/jn.113.189480] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
When food is heated to high temperatures, the characteristic "browning" generates advanced glycation end products (AGEs). AGEs are associated with an increased risk of cardiovascular disease, diabetes, and other adverse outcomes. Whether dietary AGEs are absorbed and are harmful to human health remains highly controversial. The objective of this study was to compare the effects of a diet high or low in AGEs on endothelial function, circulating AGEs, inflammatory mediators, and circulating receptors for AGEs in healthy adults. A randomized, parallel-arm, controlled dietary intervention was conducted for 6 wk with 24 healthy adults, aged 50-69 y, that compared isocaloric, food-equivalent diets that were prepared at either high or mild temperatures. Peripheral arterial tonometry, serum and urine carboxymethyl-lysine (CML), inflammatory mediators (interleukin-6, C-reactive protein, vascular adhesion molecule-1, and tumor necrosis factor-α receptors I and II), soluble receptor for AGEs, and endogenous secretory receptor for AGEs were measured at baseline and after 6 wk of dietary intervention. In the low-AGE diet group, the following changed from baseline to 6 wk (mean ± SE): serum CML from 763 ± 24 to 679 ± 29 ng/mL (P = 0.03) and urine CML from 1.37 ± 1.47 to 0.77 ± 2.01 μg/mL creatinine (P = 0.02). There were no significant changes in serum and urinary CML concentrations from baseline to follow-up in the high-AGE diet group. A high- or low-AGE diet had no significant impact on peripheral arterial tonometry or any inflammatory mediators after 6 wk of dietary intervention. In healthy middle-aged to older adults, consumption of a diet high or low in AGEs for 6 wk had no impact on endothelial function and inflammatory mediators, 2 precursors of cardiovascular disease.
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Affiliation(s)
- Richard D. Semba
- Departments of Ophthalmology and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD,To whom correspondence should be addressed. E-mail:
| | | | - David J. Baer
- USDA Beltsville Human Nutrition Research Center, Beltsville, MD
| | - Kai Sun
- Departments of Ophthalmology and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Randi Turner
- Departments of Ophthalmology and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Harry A. Silber
- Departments of Ophthalmology and Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Sameera Talegawkar
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD; and
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Semba RD, Cotch MF, Gudnason V, Eiríksdottir G, Harris TB, Sun K, Klein R, Jonasson F, Ferrucci L, Schaumberg DA. Serum carboxymethyllysine, an advanced glycation end product, and age-related macular degeneration: the Age, Gene/Environment Susceptibility-Reykjavik Study. JAMA Ophthalmol 2014; 132:464-70. [PMID: 24481410 PMCID: PMC4169215 DOI: 10.1001/jamaophthalmol.2013.7664] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
IMPORTANCE Advanced glycation end products have been implicated in the pathogenesis of age-related macular degeneration (AMD). OBJECTIVE To investigate the relationship between serum carboxymethyllysine (CML), a major circulating advanced glycation end product, and AMD in older adults. DESIGN, SETTING, AND PARTICIPANTS Cross-sectional study of a population-based sample of 4907 older adults (aged ≥66 years) in the Age, Gene/Environment Susceptibility-Reykjavik Study in Iceland. EXPOSURES Serum CML and risk factors for AMD. MAIN OUTCOMES AND MEASURES Early or late AMD, assessed through fundus images taken through dilated pupils using a 45° digital camera and grading for drusen size, type, area, increased retinal pigment, retinal pigment epithelial depigmentation, neovascular lesions, and geographic atrophy using the modified Wisconsin Age-Related Maculopathy Grading System. RESULTS Of the 4907 participants, 1025 (20.9%) had early AMD and 276 (5.6%) had late AMD. Mean (SD) serum CML concentrations among adults with no AMD, early AMD, and late AMD (exudative AMD and pure geographic atrophy) were 618.8 (195.5), 634.2 (206.4), and 638.4 (192.0) ng/mL, respectively (to convert to micromoles per liter, multiply by 0.00489; P = .07). Log serum CML (per 1-SD increase) was not associated with any AMD (early and late AMD) (odds ratio = 0.97; 95% CI, 0.90-1.04; P = .44) or with late AMD (odds ratio = 0.94; 95% CI, 0.82-1.08; P = .36) in respective multivariable logistic regression models adjusting for age, sex, body mass index, smoking, and renal function. CONCLUSIONS AND RELEVANCE Higher serum CML concentration had no significant cross-sectional association with prevalent AMD in this large population-based cohort of older adults in Iceland.
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Affiliation(s)
- Richard D Semba
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Mary Frances Cotch
- Division of Epidemiology and Clinical Research, National Eye Institute, Bethesda, Maryland
| | - Vilmundur Gudnason
- Icelandic Heart Association, Reykjavik, Iceland4Department of Medicine, University of Iceland, Reykjavik, Iceland
| | | | - Tamara B Harris
- Laboratory of Epidemiology, Demography, and Biometry, Intramural Research Program, National Institute on Aging, Bethesda, Maryland
| | - Kai Sun
- Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Ronald Klein
- Department of Ophthalmology and Visual Sciences, University of Wisconsin, Madison
| | - Fridbert Jonasson
- Department of Medicine, University of Iceland, Reykjavik, Iceland7Department of Ophthalmology, Landspitali University Hospital, Reykjavik, Iceland
| | - Luigi Ferrucci
- Longitudinal Studies Section, National Institute on Aging, Baltimore, Maryland
| | - Debra A Schaumberg
- Moran Center for Translational Medicine, Department of Ophthalmology and Visual Sciences, University of Utah School of Medicine, Salt Lake City
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Phenotypes and biomarkers of diabetic retinopathy. Prog Retin Eye Res 2014; 41:90-111. [PMID: 24680929 DOI: 10.1016/j.preteyeres.2014.03.003] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 03/11/2014] [Accepted: 03/18/2014] [Indexed: 12/15/2022]
Abstract
Diabetic retinopathy (DR) remains a major cause of blindness as the prevalence of diabetes is expected to approximately double globally between 2000 and 2030. DR progresses over time at different rates in different individuals with only a limited number developing significant vision loss due to the two major vision-threatening complications, clinically significant macular edema and proliferative retinopathy. Good metabolic control is important to prevent and delay progression, but whereas some patients escape vision loss even with poor control, others develop vision loss despite good metabolic control. Our research group has been able to identify three different DR phenotypes characterized by different dominant retinal alterations and different risks of progression to vision-threatening complications. Microaneurysm turnover has been validated as a prognostic biomarker of development of clinically significant macular edema, whereas subclinical macular edema identified by OCT and mfERG appear to be also good candidates as organ-specific biomarkers of DR. Hemoglobin A1c remains the only confirmed systemic prognostic biomarker of DR progression. The availability of biomarkers of DR progression and the identification of different phenotypes of DR with different risks for development of vision-threatening complications offers new perspectives for understanding DR and for its personalized management.
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Song HB, Jun HO, Kim JH, Yu YS, Kim KW, Kim JH. Suppression of protein kinase C-ζ attenuates vascular leakage via prevention of tight junction protein decrease in diabetic retinopathy. Biochem Biophys Res Commun 2014; 444:63-8. [DOI: 10.1016/j.bbrc.2014.01.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2013] [Accepted: 01/07/2014] [Indexed: 01/17/2023]
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Barzilay JI, Bůžková P, Zieman SJ, Kizer JR, Djoussé L, Ix JH, Tracy RP, Siscovick DS, Cauley JA, Mukamal KJ. Circulating levels of carboxy‐methyl‐lysine (CML) are associated with hip fracture risk: the Cardiovascular Health Study. J Bone Miner Res 2014; 29:1061-6. [PMID: 24877243 PMCID: PMC4523135 DOI: 10.1002/jbmr.2123] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Advanced glycation end products (AGE) in bone tissue are associated with impaired biomechanical properties and increased fracture risk. Here we examine whether serum levels of the AGE carboxy‐methyl‐lysine (CML) are associated with risk of hip fracture.We followed 3373 participants from the Cardiovascular Health Study (age 78 years; range, 68–102 years; 39.8% male) for a median of 9.22 years (range, 0.01–12.07 years). Rates of incident hip fracture were calculated by quartiles of baseline CML levels, and hazard ratios were adjusted for covariates associated with hip fracture risk. A subcohort of 1315 participants had bone mineral density (BMD)measurement. There were 348 hip fractures during follow‐up, with incidence rates of hip fracture by CML quartiles of 0.94, 1.34, 1.18, and 1.69 per 100 participant‐years. The unadjusted hazard ratio of hip fracture increased with each 1 SD increase (189 ng/mL) of CML level (hazard ratio, 1.27; 95% confidence interval [CI], 1.16–1.40]; p<0.001). Sequential adjustment for age, gender, race/ethnicity,body mass index (BMI), smoking, alcohol consumption, prevalent coronary heart disease (CHD), energy expenditure, and estimated glomerular filtration rate (based on cystatin C), moderately attenuated the hazard ratio for fracture (1.17; 95% CI, 1.05–1.31; p=0.006).In the cohort with BMD testing, total hip BMD was not significantly associated with CML levels. We conclude that increasing levels of CML are associated with hip fracture risk in older adults, independent of hip BMD. These results implicate AGE in the pathogenesis of hip fractures.
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Affiliation(s)
- Joshua I Barzilay
- Division of Endocrinology, Kaiser Permanente of Georgia and Division of Endocrinology; Emory School of Medicine; Atlanta GA USA
| | - Petra Bůžková
- Department of Biostatistics; University of Washington; Seattle WA USA
| | - Susan J Zieman
- Geriatrics Branch Office, National Institute of Aging; National Institutes of Health (NIH); Bethesda MD USA
| | - Jorge R Kizer
- Division of Epidemiology and Population Health, Department of Medicine; Albert Einstein School of Medicine; Bronx NY USA
| | - Luc Djoussé
- Department of Medicine; Brigham and Women's Hospital and Harvard Medical School; Boston MA USA
| | - Joachim H Ix
- Division of Nephrology; University of California San Diego, San Diego VA Healthcare System; San Diego CA USA
| | - Russell P Tracy
- Departments of Pathology and Biochemistry; University of Vermont College of Medicine; Burlington VT USA
| | | | - Jane A Cauley
- Department of Epidemiology, Graduate School of Public Health; University of Pittsburgh; Pittsburgh PA USA
| | - Kenneth J Mukamal
- Department of Medicine; Beth Israel Deaconess Medical Center; Boston MA USA
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Therapeutic potential of targeting lipid aldehydes and lipoxidation end-products in the treatment of ocular disease. Future Med Chem 2013; 5:189-211. [PMID: 23360143 DOI: 10.4155/fmc.12.202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Lipoxidation reactions and the subsequent accumulation of advanced lipoxidation end products (ALEs) have been implicated in the pathogenesis of many of the leading causes of visual impairment. Here, we begin by outlining some of the major lipid aldehydes produced through lipoxidation reactions, the ALEs formed upon their reaction with proteins, and the endogenous aldehyde metabolizing enzymes involved in protecting cells against lipoxidation mediated damage. Discussions are subsequently focused on the clinical and experimental evidence supporting the contribution of lipid aldehydes and ALEs in the development of ocular diseases. From these discussions, it is clear that inhibition of lipoxidation reactions and ALE formation could represent a new therapeutic avenue for the treatment of a broad range of ocular disorders. Current and emerging pharmacological strategies to prevent or neutralize the effects of lipid aldehydes and ALEs are therefore considered, with particular emphasis on the potential of these drugs for treatment of diseases of the eye.
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Pilot study: Hypoglycemic and antiglycation activities of bitter melon (Momordica charantia L.) in type 2 diabetic patients. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.jopr.2013.08.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Holik AK, Rohm B, Somoza MM, Somoza V. N(ε)-Carboxymethyllysine (CML), a Maillard reaction product, stimulates serotonin release and activates the receptor for advanced glycation end products (RAGE) in SH-SY5Y cells. Food Funct 2013; 4:1111-20. [PMID: 23759926 DOI: 10.1039/c3fo60097a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Maillard reaction products, which are formed in highly thermally treated foods, are commonly consumed in a Western diet. In this study, we investigated the impact of N(ε)-carboxymethyllysine (CML), a well-characterized product of the Maillard reaction, on the gene regulation of the human neuroblastoma cell line SH-SY5Y. Pathway analysis of data generated from customized DNA microarrays revealed 3 h incubation with 50 μM and 500 μM CML to affect serotonin receptor expression. Further experiments employing qRT-PCR showed an up-regulation of serotonin receptors 2A, 1A and 1B after 0.25 h and 3 h. In addition, 500 μM CML increased serotonin release, thus showing effects of CML not only at a genetic, but also at a functional level. Intracellular calcium mobilization, which mediates serotonin release, was increased by CML at concentrations of 0.05-500 μM. Since calcium mobilization has been linked to the activation of the receptor for advanced glycation end products (RAGE), we further investigated the effects of CML on RAGE expression. RAGE was found to be up-regulated after incubation with 500 μM CML for 0.25 h. Co-incubation with the calcium blocker neomycin for 0.25 h blocked the up-regulation of RAGE and the serotonin receptors 2A, 1A and 1B. These results indicate a possible link between a CML-induced calcium-mediated serotonin release and RAGE.
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Affiliation(s)
- Ann-Katrin Holik
- Department of Nutritional and Physiological Chemistry, University of Vienna, Althanstraße 14, Vienna, Austria
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Moy KA, Jiao L, Freedman ND, Weinstein SJ, Sinha R, Virtamo J, Albanes D, Stolzenberg-Solomon RZ. Soluble receptor for advanced glycation end products and risk of liver cancer. Hepatology 2013; 57:2338-45. [PMID: 23325627 PMCID: PMC3644530 DOI: 10.1002/hep.26264] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Accepted: 12/27/2012] [Indexed: 12/14/2022]
Abstract
UNLABELLED Binding of advanced glycation end products (AGEs) to their receptor (RAGE) increases oxidative stress and inflammation and may be involved in liver injury and subsequent carcinogenesis. Soluble RAGE (sRAGE) may neutralize the effects mediated by the AGE/RAGE complex. Epidemiologic studies examining sRAGE or AGEs in association with liver cancer are lacking. We examined the associations between prediagnostic serum concentrations of sRAGE or Nϵ-(carboxymethyl)-lysine (CML)-AGE and hepatocellular carcinoma in a case-cohort study within a cohort of 29,133 Finnish male smokers who completed questionnaires and provided a fasting blood sample between 1985 and 1988. During follow-up beginning 5 years after enrollment through April 2006, 145 liver cancers occurred. Serum concentrations of sRAGE, CML-AGE, glucose, and insulin were measured in case subjects and 485 randomly sampled cohort participants. Chronic hepatitis B virus (HBV) and hepatitis C virus (HCV) were available in most cases and in a subset of the study population. Weighted Cox proportional hazards regression was used to calculate relative risks (RR) and 95% confidence intervals (CI) adjusted for age, years of smoking, and body mass index. sRAGE and CML-AGE concentrations were inversely associated with liver cancer. Further adjustment for glucose and insulin or exclusion of case subjects with chronic HBV or HCV did not change the associations. CONCLUSION Our results support the hypothesis that sRAGE is inversely associated with liver cancer. The findings need confirmation, particularly in populations that include women and nonsmokers. (HEPATOLOGY 2013 ).
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Affiliation(s)
- Kristin A. Moy
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Nation Institutes of Health, Bethesda, Maryland
| | - Li Jiao
- Section of Gastroenterology and Hepatology, Department of Medicine, Baylor College of Medicine, Houston, TX
| | - Neal D. Freedman
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Nation Institutes of Health, Bethesda, Maryland
| | - Stephanie J. Weinstein
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Nation Institutes of Health, Bethesda, Maryland
| | - Rashmi Sinha
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Nation Institutes of Health, Bethesda, Maryland
| | - Jarmo Virtamo
- Department of Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
| | - Demetrius Albanes
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Nation Institutes of Health, Bethesda, Maryland
| | - Rachael Z. Stolzenberg-Solomon
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Nation Institutes of Health, Bethesda, Maryland
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