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Fan W, Adebowale K, Váncza L, Li Y, Rabbi MF, Kunimoto K, Chen D, Mozes G, Chiu DKC, Li Y, Tao J, Wei Y, Adeniji N, Brunsing RL, Dhanasekaran R, Singhi A, Geller D, Lo SH, Hodgson L, Engleman EG, Charville GW, Charu V, Monga SP, Kim T, Wells RG, Chaudhuri O, Török NJ. Matrix viscoelasticity promotes liver cancer progression in the pre-cirrhotic liver. Nature 2024; 626:635-642. [PMID: 38297127 PMCID: PMC10866704 DOI: 10.1038/s41586-023-06991-9] [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: 09/21/2022] [Accepted: 12/18/2023] [Indexed: 02/02/2024]
Abstract
Type 2 diabetes mellitus is a major risk factor for hepatocellular carcinoma (HCC). Changes in extracellular matrix (ECM) mechanics contribute to cancer development1,2, and increased stiffness is known to promote HCC progression in cirrhotic conditions3,4. Type 2 diabetes mellitus is characterized by an accumulation of advanced glycation end-products (AGEs) in the ECM; however, how this affects HCC in non-cirrhotic conditions is unclear. Here we find that, in patients and animal models, AGEs promote changes in collagen architecture and enhance ECM viscoelasticity, with greater viscous dissipation and faster stress relaxation, but not changes in stiffness. High AGEs and viscoelasticity combined with oncogenic β-catenin signalling promote HCC induction, whereas inhibiting AGE production, reconstituting the AGE clearance receptor AGER1 or breaking AGE-mediated collagen cross-links reduces viscoelasticity and HCC growth. Matrix analysis and computational modelling demonstrate that lower interconnectivity of AGE-bundled collagen matrix, marked by shorter fibre length and greater heterogeneity, enhances viscoelasticity. Mechanistically, animal studies and 3D cell cultures show that enhanced viscoelasticity promotes HCC cell proliferation and invasion through an integrin-β1-tensin-1-YAP mechanotransductive pathway. These results reveal that AGE-mediated structural changes enhance ECM viscoelasticity, and that viscoelasticity can promote cancer progression in vivo, independent of stiffness.
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Affiliation(s)
- Weiguo Fan
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Kolade Adebowale
- Department of Chemical Engineering, Stanford University, Stanford, CA, USA
- Chemistry, Engineering and Medicine for Human Health (ChEM-H), Stanford University, Stanford, CA, USA
| | - Lóránd Váncza
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Yuan Li
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Md Foysal Rabbi
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA
| | - Koshi Kunimoto
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Dongning Chen
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Gergely Mozes
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - David Kung-Chun Chiu
- Department of Pathology, Stanford University, Stanford, CA, USA
- Division of Immunology, Stanford University, Stanford, CA, USA
| | - Yisi Li
- Department of Automation, Tsinghua University, Beijing, China
| | - Junyan Tao
- Pittsburgh Liver Research Center, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Yi Wei
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Nia Adeniji
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Ryan L Brunsing
- Department of Radiology, Stanford University, Stanford, CA, USA
| | - Renumathy Dhanasekaran
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA
- VA, Palo Alto, CA, USA
| | - Aatur Singhi
- Pittsburgh Liver Research Center, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - David Geller
- Pittsburgh Liver Research Center, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Su Hao Lo
- Department of Biochemistry and Molecular Medicine, University of California at Davis, Sacramento, CA, USA
| | - Louis Hodgson
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, New York, NY, USA
| | - Edgar G Engleman
- Department of Pathology, Stanford University, Stanford, CA, USA
- Division of Immunology, Stanford University, Stanford, CA, USA
| | | | - Vivek Charu
- Department of Pathology, Stanford University, Stanford, CA, USA
- Quantitative Sciences Unit, Department of Medicine, Stanford University School of Medicine, Stanford, CA, USA
| | - Satdarshan P Monga
- Pittsburgh Liver Research Center, University of Pittsburgh and University of Pittsburgh Medical Center, Pittsburgh, PA, USA
| | - Taeyoon Kim
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA
- Faculty of Science and Technology, Keio University, Yokohama, Japan
| | - Rebecca G Wells
- Departments of Medicine and Bioengineering, University of Pennsylvania, Philadelphia, PA, USA
| | - Ovijit Chaudhuri
- Chemistry, Engineering and Medicine for Human Health (ChEM-H), Stanford University, Stanford, CA, USA
- Department of Mechanical Engineering, Stanford University, Stanford, CA, USA
| | - Natalie J Török
- Gastroenterology and Hepatology, Stanford University, Stanford, CA, USA.
- VA, Palo Alto, CA, USA.
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Bao Q, Wang L, Hu X, Yuan C, Zhang Y, Chang G, Chen G. Developmental Changes of Duckling Liver and Isolation of Primary Hepatocytes. Animals (Basel) 2023; 13:1820. [PMID: 37889689 PMCID: PMC10252113 DOI: 10.3390/ani13111820] [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: 04/18/2023] [Revised: 05/23/2023] [Accepted: 05/30/2023] [Indexed: 10/29/2023] Open
Abstract
The liver is the main site of fat synthesis and plays an important role in the study of fat deposition in poultry. In this study, we investigated the developmental changes of duckling livers and isolated primary duck hepatocytes. Firstly, we observed morphological changes in duckling livers from the embryonic period to the first week after hatching. Liver weight increased with age. Hematoxylin-eosin and Oil Red O staining analyses showed that hepatic lipids increased gradually during the embryonic period and declined post-hatching. Liver samples were collected from 21-day-old duck embryos for hepatocyte isolation. The hepatocytes showed limited self-renewal and proliferative ability and were maintained in culture for up to 7 days. Typical parenchymal morphology, with a characteristic polygonal shape, appeared after two days of culture. Periodic acid-Schiff (PAS) staining analysis confirmed the characteristics of duck embryo hepatocytes. PCR analysis showed that these cells from duck embryos expressed the liver cell markers ALB and CD36. Immunohistochemical staining and immunofluorescence analysis also confirmed ALB and CK18 expression. Our findings provide a novel insight regarding in vitro cell culture and the characteristics of hepatocytes from avian species, which could enable further studies concerning specific research on duck lipid metabolism.
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Affiliation(s)
- Qiang Bao
- Key Laboratory for Evaluation and Utilization of Poultry Genetic Resources, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China; (Q.B.); (L.W.); (X.H.); (C.Y.); (G.C.); (G.C.)
| | - Laidi Wang
- Key Laboratory for Evaluation and Utilization of Poultry Genetic Resources, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China; (Q.B.); (L.W.); (X.H.); (C.Y.); (G.C.); (G.C.)
| | - Xiaodan Hu
- Key Laboratory for Evaluation and Utilization of Poultry Genetic Resources, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China; (Q.B.); (L.W.); (X.H.); (C.Y.); (G.C.); (G.C.)
| | - Chunyou Yuan
- Key Laboratory for Evaluation and Utilization of Poultry Genetic Resources, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China; (Q.B.); (L.W.); (X.H.); (C.Y.); (G.C.); (G.C.)
| | - Yang Zhang
- Key Laboratory for Evaluation and Utilization of Poultry Genetic Resources, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China; (Q.B.); (L.W.); (X.H.); (C.Y.); (G.C.); (G.C.)
| | - Guobin Chang
- Key Laboratory for Evaluation and Utilization of Poultry Genetic Resources, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China; (Q.B.); (L.W.); (X.H.); (C.Y.); (G.C.); (G.C.)
| | - Guohong Chen
- Key Laboratory for Evaluation and Utilization of Poultry Genetic Resources, Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China; (Q.B.); (L.W.); (X.H.); (C.Y.); (G.C.); (G.C.)
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou University, Yangzhou 225009, China
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Dehnad A, Fan W, Jiang JX, Fish SR, Li Y, Das S, Mozes G, Wong KA, Olson KA, Charville GW, Ali M, Török NJ. AGER1 downregulation associates with fibrosis in nonalcoholic steatohepatitis and type 2 diabetes. J Clin Invest 2021; 130:4320-4330. [PMID: 32657776 DOI: 10.1172/jci133051] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 05/05/2020] [Indexed: 12/25/2022] Open
Abstract
Type 2 diabetes is clinically associated with progressive necroinflammation and fibrosis in nonalcoholic steatohepatitis (NASH). Advanced glycation end-products (AGEs) accumulate during prolonged hyperglycemia, but the mechanistic pathways that lead to accelerated liver fibrosis have not been well defined. In this study, we show that the AGEs clearance receptor AGER1 was downregulated in patients with NASH and diabetes and in our NASH models, whereas the proinflammatory receptor RAGE was induced. These findings were associated with necroinflammatory, fibrogenic, and pro-oxidant activity via the NADPH oxidase 4. Inhibition of AGEs or RAGE deletion in hepatocytes in vivo reversed these effects. We demonstrate that dysregulation of NRF2 by neddylation of cullin 3 was linked to AGER1 downregulation and that induction of NRF2 using an adeno-associated virus-mediated approach in hepatocytes in vivo reversed AGER1 downregulation, lowered the level of AGEs, and improved proinflammatory and fibrogenic responses in mice on a high AGEs diet. In patients with NASH and diabetes or insulin resistance, low AGER1 levels were associated with hepatocyte ballooning degeneration and ductular reaction. Collectively, prolonged exposure to AGEs in the liver promotes an AGER1/RAGE imbalance and consequent redox, inflammatory, and fibrogenic activity in NASH.
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Affiliation(s)
- Ali Dehnad
- Gastroenterology and Hepatology, Stanford University, Stanford, and VA Palo Alto, California, USA
| | - Weiguo Fan
- Gastroenterology and Hepatology, Stanford University, Stanford, and VA Palo Alto, California, USA
| | | | | | - Yuan Li
- Gastroenterology and Hepatology, Stanford University, Stanford, and VA Palo Alto, California, USA
| | - Suvarthi Das
- Gastroenterology and Hepatology, Stanford University, Stanford, and VA Palo Alto, California, USA
| | - Gergely Mozes
- Gastroenterology and Hepatology, Stanford University, Stanford, and VA Palo Alto, California, USA
| | | | - Kristin A Olson
- Department of Pathology, UC Davis Medical Center, Sacramento, California, USA
| | | | - Mohammed Ali
- Department of Surgery, UC Davis Medical Center, Sacramento, California, USA
| | - Natalie J Török
- Gastroenterology and Hepatology, Stanford University, Stanford, and VA Palo Alto, California, USA
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Puchałowicz K, Rać ME. The Multifunctionality of CD36 in Diabetes Mellitus and Its Complications-Update in Pathogenesis, Treatment and Monitoring. Cells 2020; 9:cells9081877. [PMID: 32796572 PMCID: PMC7465275 DOI: 10.3390/cells9081877] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 08/04/2020] [Accepted: 08/09/2020] [Indexed: 02/08/2023] Open
Abstract
CD36 is a multiligand receptor contributing to glucose and lipid metabolism, immune response, inflammation, thrombosis, and fibrosis. A wide range of tissue expression includes cells sensitive to metabolic abnormalities associated with metabolic syndrome and diabetes mellitus (DM), such as monocytes and macrophages, epithelial cells, adipocytes, hepatocytes, skeletal and cardiac myocytes, pancreatic β-cells, kidney glomeruli and tubules cells, pericytes and pigment epithelium cells of the retina, and Schwann cells. These features make CD36 an important component of the pathogenesis of DM and its complications, but also a promising target in the treatment of these disorders. The detrimental effects of CD36 signaling are mediated by the uptake of fatty acids and modified lipoproteins, deposition of lipids and their lipotoxicity, alterations in insulin response and the utilization of energy substrates, oxidative stress, inflammation, apoptosis, and fibrosis leading to the progressive, often irreversible organ dysfunction. This review summarizes the extensive knowledge of the contribution of CD36 to DM and its complications, including nephropathy, retinopathy, peripheral neuropathy, and cardiomyopathy.
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Mariño L, Maya-Aguirre CA, Pauwels K, Vilanova B, Ortega-Castro J, Frau J, Donoso J, Adrover M. Glycation of Lysozyme by Glycolaldehyde Provides New Mechanistic Insights in Diabetes-Related Protein Aggregation. ACS Chem Biol 2017; 12:1152-1162. [PMID: 28257177 DOI: 10.1021/acschembio.6b01103] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Glycation occurs in vivo as a result of the nonenzymatic reaction of carbohydrates (and/or their autoxidation products) with proteins, DNA, or lipids. Protein glycation causes loss-of-function and, consequently, the development of diabetic-related diseases. Glycation also boosts protein aggregation, which can be directly related with the higher prevalence of aggregating diseases in diabetic people. However, the molecular mechanism connecting glycation with aggregation still remains unclear. Previously we described mechanistically how glycation of hen egg-white lysozyme (HEWL) with ribose induced its aggregation. Here we address the question of whether the ribose-induced aggregation is a general process or it depends on the chemical nature of the glycating agent. Glycation of HEWL with glycolaldehyde occurs through two different scenarios depending on the HEWL concentration regime (both within the micromolar range). At low HEWL concentration, non-cross-linking fluorescent advanced glycation end-products (AGEs) are formed on Lys side chains, which do not change the protein structure but inhibit its enzymatic activity. These AGEs have little impact on HEWL surface hydrophobicity and, therefore, a negligible effect on its aggregation propensity. Upon increasing HEWL concentration, the glycation mechanism shifts toward the formation of intermolecular cross-links, which triggers a polymerization cascade involving the formation of insoluble spherical-like aggregates. These results notably differ with the aggregation-modulation mechanism of ribosylated HEWL directed by hydrophobic interactions. Additionally, their comparison constitutes the first experimental evidence showing that the mechanism underlying the aggregation of a glycated protein depends on the chemical nature of the glycating agent.
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Affiliation(s)
- Laura Mariño
- University Institute of Health Sciences (UNICS-IdisPa), Ctra. Valldemossa 79, E-07010, Palma de Mallorca, Spain
- Departament
de Química, Universitat de les Illes Balears, Ctra. Valldemossa
km 7.5, E-07122, Palma de Mallorca, Spain
| | - Carlos Andrés Maya-Aguirre
- Departament
de Química, Universitat de les Illes Balears, Ctra. Valldemossa
km 7.5, E-07122, Palma de Mallorca, Spain
| | - Kris Pauwels
- Structural
Biology Brussels, Vrije Universiteit Brussels, Pleinlaan 2, 1050 Brussels, Belgium
- VIB
Structural Biology Research Centre, Vlaams Instituut voor Biotechnologie, Pleinlaan 2, 1050 Brussels, Belgium
| | - Bartolomé Vilanova
- University Institute of Health Sciences (UNICS-IdisPa), Ctra. Valldemossa 79, E-07010, Palma de Mallorca, Spain
- Departament
de Química, Universitat de les Illes Balears, Ctra. Valldemossa
km 7.5, E-07122, Palma de Mallorca, Spain
| | - Joaquin Ortega-Castro
- University Institute of Health Sciences (UNICS-IdisPa), Ctra. Valldemossa 79, E-07010, Palma de Mallorca, Spain
- Departament
de Química, Universitat de les Illes Balears, Ctra. Valldemossa
km 7.5, E-07122, Palma de Mallorca, Spain
| | - Juan Frau
- University Institute of Health Sciences (UNICS-IdisPa), Ctra. Valldemossa 79, E-07010, Palma de Mallorca, Spain
- Departament
de Química, Universitat de les Illes Balears, Ctra. Valldemossa
km 7.5, E-07122, Palma de Mallorca, Spain
| | - Josefa Donoso
- University Institute of Health Sciences (UNICS-IdisPa), Ctra. Valldemossa 79, E-07010, Palma de Mallorca, Spain
- Departament
de Química, Universitat de les Illes Balears, Ctra. Valldemossa
km 7.5, E-07122, Palma de Mallorca, Spain
| | - Miquel Adrover
- University Institute of Health Sciences (UNICS-IdisPa), Ctra. Valldemossa 79, E-07010, Palma de Mallorca, Spain
- Departament
de Química, Universitat de les Illes Balears, Ctra. Valldemossa
km 7.5, E-07122, Palma de Mallorca, Spain
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López-Díez R, Shekhtman A, Ramasamy R, Schmidt AM. Cellular mechanisms and consequences of glycation in atherosclerosis and obesity. Biochim Biophys Acta Mol Basis Dis 2016; 1862:2244-2252. [PMID: 27166197 DOI: 10.1016/j.bbadis.2016.05.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 04/28/2016] [Accepted: 05/05/2016] [Indexed: 02/07/2023]
Abstract
Post-translational modification of proteins imparts diversity to protein functions. The process of glycation represents a complex set of pathways that mediates advanced glycation endproduct (AGE) formation, detoxification, intracellular disposition, extracellular release, and induction of signal transduction. These processes modulate the response to hyperglycemia, obesity, aging, inflammation, and renal failure, in which AGE formation and accumulation is facilitated. It has been shown that endogenous anti-AGE protective mechanisms are thwarted in chronic disease, thereby amplifying accumulation and detrimental cellular actions of these species. Atop these considerations, receptor for advanced glycation endproducts (RAGE)-mediated pathways downregulate expression and activity of the key anti-AGE detoxification enzyme, glyoxalase-1 (GLO1), thereby setting in motion an interminable feed-forward loop in which AGE-mediated cellular perturbation is not readily extinguished. In this review, we consider recent work in the field highlighting roles for glycation in obesity and atherosclerosis and discuss emerging strategies to block the adverse consequences of AGEs. This article is part of a Special Issue entitled: The role of post-translational protein modifications on heart and vascular metabolism edited by Jason R.B. Dyck & Jan F.C. Glatz.
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Affiliation(s)
- Raquel López-Díez
- Diabetes Research Program, Division of Endocrinology, Department of Medicine, NYU Langone Medical Center, New York, NY 10016, United States
| | - Alexander Shekhtman
- Department of Chemistry, University at Albany, State University of New York, 1400 Washington Avenue, Albany, NY 12222, United States
| | - Ravichandran Ramasamy
- Diabetes Research Program, Division of Endocrinology, Department of Medicine, NYU Langone Medical Center, New York, NY 10016, United States
| | - Ann Marie Schmidt
- Diabetes Research Program, Division of Endocrinology, Department of Medicine, NYU Langone Medical Center, New York, NY 10016, United States.
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Oxidative stress and adipocyte biology: focus on the role of AGEs. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:534873. [PMID: 25878764 PMCID: PMC4386674 DOI: 10.1155/2015/534873] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 03/06/2015] [Indexed: 12/16/2022]
Abstract
Diabetes is a major health problem that is usually associated with obesity, together with hyperglycemia and increased advanced glycation endproducts (AGEs) formation. Elevated AGEs elicit severe downstream consequences via their binding to receptors of AGEs (RAGE). This includes oxidative stress and oxidative modifications of biological compounds together with heightened inflammation. For example, albumin (major circulating protein) undergoes increased glycoxidation with diabetes and may represent an important biomarker for monitoring diabetic pathophysiology. Despite the central role of adipose tissue in many physiologic/pathologic processes, recognition of the effects of greater AGEs formation in this tissue is quite recent within the obesity/diabetes context. This review provides a brief background of AGEs formation and adipose tissue biology and thereafter discusses the impact of AGEs-adipocyte interactions in pathology progression. Novel data are included showing how AGEs (especially glycated albumin) may be involved in hyperglycemia-induced oxidative damage in adipocytes and its potential links to diabetes progression.
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Gaens KHJ, Stehouwer CDA, Schalkwijk CG. Advanced glycation endproducts and its receptor for advanced glycation endproducts in obesity. Curr Opin Lipidol 2013; 24:4-11. [PMID: 23298958 DOI: 10.1097/mol.0b013e32835aea13] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE OF REVIEW To highlight the potential importance of advanced glycation endproducts (AGEs) and advanced-lipoxidation endproducts (ALEs) in obesity and obesity-related complications, and the contribution of the receptor for advanced glycation endproducts (RAGE) and the glyoxylase defense system therein. RECENT FINDINGS Formation of AGEs/ALEs and its precursors, including methylglyoxal (MGO), are increased in conditions characterized by hyperglycemia, hyperlipidemia and enhanced oxidative stress. This metabolic profile is generally considered typical for obesity. Increased plasma and/or tissue levels of MGO and of specific AGEs/ALEs, such as N(ε)-(carboxymethyl)lysine (CML), in obesity have recently been described. In addition to increased formation, the suppressed defense system in obesity against AGEs/ALEs formation, that is, the glyoxylase system, will further contribute to AGEs/ALEs formation in obesity. AGEs/ALEs are not inert. In-vitro studies showed that AGEs induced the production of inflammatory mediators in adipocytes and macrophages via RAGE activation, which may subsequently contribute to the development of obesity-related complications. SUMMARY The recognition of an enhanced AGEs/ALEs formation in adipose tissue and the biological consequences thereof may lead to a further understanding of underlying mechanisms in dysregulated production of adipokines in obesity.
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Affiliation(s)
- Katrien H J Gaens
- Department of Internal Medicine, Maastricht University Medical Center, Maastricht, the Netherlands
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9
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Semba RD, Arab L, Sun K, Nicklett EJ, Ferrucci L. Fat mass is inversely associated with serum carboxymethyl-lysine, an advanced glycation end product, in adults. J Nutr 2011; 141:1726-30. [PMID: 21775524 PMCID: PMC3159057 DOI: 10.3945/jn.111.143172] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Revised: 06/07/2011] [Accepted: 06/21/2011] [Indexed: 01/02/2023] Open
Abstract
High levels of circulating advanced glycation end products (AGE) are associated with cardiovascular disease, diabetes, chronic kidney disease, and increased mortality, but factors that influence levels of circulating AGE are not well known. Our objective was to characterize the relationship between serum carboxymethyl-lysine (CML), a major circulating AGE, and body composition in adults. In a cross-sectional study, total body DXA was performed and serum CML was measured in 592 adults, aged 26-93 y, from the Baltimore Longitudinal Study of Aging. Median (25th, 75th percentile) CML concentrations were 2.26 (1.86, 2.67) μmol/L. Total fat mass [β = -0.17 (95% CI -0.10, -0.24); P < 0.0001], truncal fat mass [β = -0.17 (95% CI -0.10, -0.25); P < 0.0001], and appendicular fat mass [β = -0.13 (95% CI -0.05, -0.20); P = 0.001] per 1 SD increase were inversely associated with serum CML in separate multivariate linear regression models, adjusting for age, sex, BMI, systolic blood pressure, TG, HDL cholesterol, and renal function. Lean body mass was not independently associated with serum CML. These findings suggest that serum CML concentration is strongly affected by body fat, possibly because CML is preferentially deposited in fat tissue or because adipocytes affect the metabolism of AGE.
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Affiliation(s)
- Richard D Semba
- Department of Ophthalmology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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10
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Singh NR, Rondeau P, Hoareau L, Bourdon E. Identification of preferential protein targets for carbonylation in human mature adipocytes treated with native or glycated albumin. Free Radic Res 2009; 41:1078-88. [PMID: 17886029 DOI: 10.1080/10715760701487674] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Oxidative modifications in proteins can participate in the regulation of cellular functions and are frequently observed in numerous states of diseases. Albumin can undergo increased glycation during diabetes. An accumulation of oxidatively modified proteins in human mature adipocytes incubated with glycated albumin has previously been described. This study herein reports the identification of specifically carbonylated targets following separation of the cell proteins by 2D gels, Western blotting and mass spectrometry analyses. It identified eight oxidatively modified proteins, two of which (ACTB and Annexin A2) appeared as significantly more carbonylated in adipocytes treated with glycated albumin than with native albumin. Intracellular stress, evaluated in SW872 cell line, showed an impairment in the protective antioxidant action exerted by native BSA after the glycation of the protein. Decreased proteasome peptidase activities were found in glycated BSA-treated mature adipocytes. The data suggest an association of oxidative damage with the progression of diabetes disorders at the adipocytes level.
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Affiliation(s)
- Nihar Ranjan Singh
- Laboratoire de Biochimie et Génétique Moléculaire, Université de La Réunion, Cedex 09, Saint Denis, France
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11
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Adrover M, Vilanova B, Muñoz F, Donoso J. Kinetic Study of the Reaction of Glycolaldehyde with Two Glycation Target Models. Ann N Y Acad Sci 2008; 1126:235-40. [DOI: 10.1196/annals.1433.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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12
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Sebeková K, Boor P, Valachovicová M, Blazícek P, Parrák V, Babinská K, Heidland A, Krajcovicová-Kudlácková M. Association of metabolic syndrome risk factors with selected markers of oxidative status and microinflammation in healthy omnivores and vegetarians. Mol Nutr Food Res 2006; 50:858-68. [PMID: 16917805 DOI: 10.1002/mnfr.200500170] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Conditions predisposing to metabolic syndrome (MetS) are associated with increased oxidative stress and inflammation. We studied, in vegetarians (n = 90) and omnivores (n = 46), the impact of the dietary regimen on the occurrence of MetS risk factors (RFs: BMI, blood pressure, glucose metabolism and lipid profile) in relation to oxidative status (advanced glycation end products (AGEs), advanced oxidation protein products (AOPPs), malondialdehyde, ferric reducing ability of plasma, vitamins A, E, C, beta-carotene and superoxide dismutase activity) and microinflammation (C-reactive protein, leukocytes and neopterin). The proportion of subjects without/positive for one or two MetS RFs was comparable between the groups. From the components of MetS only immunoreactive insulin levels differed significantly (95% CI: omnivores: 5.0-7.1 microU/mL, vegetarians: 4.5-5.4, p = 0.03). Omnivores had lower AOPP (omnivores: 0.29-0.36 micromol/g albumin, vegetarians: 0.36-0.52, p = 0.01) and beta-carotene levels than vegetarians, they consumed more calories, proteins, fat and saturated fatty acids, and less fibres, beta-carotene and vitamin C. Multiple regression analysis revealed vitamin E and AOPP levels as the most important independent determinants of MetS RFs. The vegetarian diet seems to exert beneficial effects on MetS RFs associated microinflammation. Whether the vegetarian diet may counteract the deleterious effects of elevated AOPPs and AGEs, remains to be elucidated.
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