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Shen CY, Li KJ, Wu CH, Lu CH, Kuo YM, Hsieh SC, Yu CL. Unveiling the molecular basis of inflamm-aging induced by advanced glycation end products (AGEs)-modified human serum albumin (AGE-HSA) in patients with different immune-mediated diseases. Clin Immunol 2023:109655. [PMID: 37257547 DOI: 10.1016/j.clim.2023.109655] [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: 11/17/2022] [Revised: 03/22/2023] [Accepted: 05/24/2023] [Indexed: 06/02/2023]
Abstract
Increased serum advanced glycation end products (AGEs) are commonly found in the patients with Diabetes mellitus (DM), aging-related diseases, and immune-mediated diseases. These diseases are notorious for vasculopathy, immune dysfunctions, and low-grade inflammation mimicking inflamm-aging. However, the molecular basis of inflamm-aging related to AGEs remains elucidation. In this study, we incubated human serum albumin (HSA) and glucose at 37 °C in 5% CO2 incubator for 0-180 days to generate AGE-HSA. We found the mixture gradually changing the color from transparancy to brown color and increased molecular weight during incubation. The pH value also gradually decreased from 7.2 to 5.4 irrelevant to ionic charge or [Ca2+] concentration, but dependent on gradual glycation of the alkaline amino acids, lysine and arginine. Functionally, 40 μg/mL of AGE-HSA decreased IL-2 production from human Jurkat T cell line via suppressing p-STAT3, p-STAT4, and p-STAT6 with an increased tendency of senescence-associated β-galactosidase (SA-βgal) expression but irrelevant to change of Th1/Th2/Treg subpopulations. In contrast, AGE-HSA enhanced CC motif chemokine ligand 5 (CCL-5), IL-8, macrophage migration inhibitor factor (MIF), and interleukin 1 receptor antagonist (IL-1Ra) but suppressed SA-βgal expression by human macrophage-like THP-1 cells. Interestingly, AGE-HSA abrogated the HSA-induced soluble intercellular adhesion molecules 1 (sICAM-1), sE-selectin and endothelin release from human coronary artery endothelial cells (HCAEC) and enhanced SA-βgal expression. The accelerated and increased HSA glycations by individual inflammation-related cytokine such as IL-2, IL-6, IL-17, TGF-β, or TNF-α in the in vitro study reflect increased serum AGE levels in patients with immune-mediated diseases . In conclusion, AGE-HSA can exert immunosuppresive, inflammatory and vasculopathic effects mimicking inflamm-aging in these patients.
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Affiliation(s)
- Chieh-Yu Shen
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei 10002, Taiwan; Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei 10002, Taiwan.
| | - Ko-Jen Li
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei 10002, Taiwan.
| | - Cheng-Han Wu
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei 10002, Taiwan; Department of Internal Medicine, National Taiwan University Hospital--Chu-Pei Branch, Chu-Pei 302, Taiwan.
| | - Cheng-Hsun Lu
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei 10002, Taiwan; Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei 10002, Taiwan
| | - Yu-Min Kuo
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei 10002, Taiwan; Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei 10002, Taiwan
| | - Song-Chou Hsieh
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei 10002, Taiwan.
| | - Chia-Li Yu
- Department of Internal Medicine, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei 10002, Taiwan; Institute of Molecular Medicine, National Taiwan University College of Medicine, Taipei 10002, Taiwan.
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Lipopeptides in promoting signals at surface/interface of micelles: Their roles in repairing cellular and nuclear damages. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2021.101522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mir AR, Habib S, Uddin M. Recent Advances in Histone Glycation: Emerging role in Diabetes and Cancer. Glycobiology 2021; 31:1072-1079. [PMID: 33554241 DOI: 10.1093/glycob/cwab011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 01/18/2021] [Accepted: 01/28/2021] [Indexed: 12/15/2022] Open
Abstract
Ever increasing information on genome and proteome has offered fascinating details and new opportunities to understand the molecular biology. It is now known that histone proteins surrounding the DNA play a crucial role in the chromatin structure and function. Histones undergo a plethora of post-translational enzymatic modifications that influence nucleosome dynamics and affect DNA activity. Earlier research offered insights into the enzymatic modifications of histones; however attention has been diverted to histone modifications induced by by-products of metabolism without enzymatic engagement in the last decade. Non enzymatic modifications of histones are believed to be crucial for epigenetic landscape, cellular fate and for role in human diseases. Glycation of histone proteins constitutes the major non enzymatic modifications of nuclear proteins that have implications in diabetes and cancer. It has emerged that glycation damages nuclear proteins, modifies amino acids of histones at crucial locations, generates adducts affecting histone chromatin interaction, develops neo-epitopes inducing specific immune response and impacts cell function. Presence of circulating antibodies against glycated histone proteins in diabetes and cancer has shown immunological implications with diagnostic relevance. These crucial details make histone glycation an attractive focus for investigators. This review article, therefore, makes an attempt to exclusively summarize the recent researches in histone glycation, its impact on structural integrity of chromatin and elaborates on their role in diabetes and cancer. The work offers insights for future scientists who investigate the link between metabolism, bio-molecular structures, glycobiology, histone-DNA interactions in relation to diseases in humans.
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Affiliation(s)
- Abdul Rouf Mir
- Department of Biochemistry, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, India
| | - Safia Habib
- Department of Biochemistry, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, India
| | - Moin Uddin
- Department of Biochemistry, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, India
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Malik HI, Mir AR, Abidi M, Habib S, Khan FH, Moinuddin. Preferential recognition of epitopes on peroxynitrite-modified alpha-2-macroglobulin by circulating autoantibodies in rheumatoid arthritis patients. J Biomol Struct Dyn 2020; 38:1984-1994. [PMID: 31179888 DOI: 10.1080/07391102.2019.1623073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Autoimmune responses against post-translationally modified antigens are a hallmark of several autoimmune diseases. In this work, we have studied the changes in alpha-2-macroglobulin (α2M) upon modification by peroxynitrite. Furthermore, we have evaluated the immunogenicity of modified α2M in experimental rabbits and rheumatoid arthritis (RA) patients. Peroxynitrite-modified α2M showed disturbed microenvironment and altered aromatic residues under UV and fluorescence studies. Aggregation, reduction in β-sheet content, production of nitrotyrosine and shift in amide I and II bands were observed in the modified α2M by polyacrylamide gel electrophoresis besides CD and FTIR spectroscopic analysis. The exposure of hydrophobic clusters and changes in contact positions were observed in ANS and ThT binding assays. Immunological studies using ELISA showed peroxynitrite-modified α2M as highly immunogenic producing high titre of specific antibodies in immunized rabbits. Cross-reactivity studies revealed the polyspecificity of the elicited antibodies. Direct binding ELISA and competitive inhibition studies confirmed the presence of circulating antibodies in the sera of RA patients having high specificity towards the peroxynitrite-modified α2M as compared to the native α2M. Sera from healthy (normal) human subjects showed lower binding with the native and modified protein. This study confirms that peroxynitrite induces structural modifications in α2M and makes it immunogenic. The presence of neo-antigenic determinants on modified α2M with enhanced binding for circulating autoantibodies in RA patients could offer new possibilities for diagnosis and etiopathology of the disease. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Heena Imtiaz Malik
- Department of Biochemistry, Faculty of Medicine, Aligarh Muslim University, Aligarh, UP, India
| | - Abdul Rouf Mir
- Department of Biochemistry, Faculty of Medicine, Aligarh Muslim University, Aligarh, UP, India
| | - Minhal Abidi
- Department of Biochemistry, Faculty of Medicine, Aligarh Muslim University, Aligarh, UP, India
| | - Safia Habib
- Department of Biochemistry, Faculty of Medicine, Aligarh Muslim University, Aligarh, UP, India
| | - Fahim Halim Khan
- bDepartment of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, UP, India
| | - Moinuddin
- Department of Biochemistry, Faculty of Medicine, Aligarh Muslim University, Aligarh, UP, India
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Lai JJ, Cruz FM, Rock KL. Immune Sensing of Cell Death through Recognition of Histone Sequences by C-Type Lectin-Receptor-2d Causes Inflammation and Tissue Injury. Immunity 2019; 52:123-135.e6. [PMID: 31859049 DOI: 10.1016/j.immuni.2019.11.013] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 10/10/2019] [Accepted: 11/22/2019] [Indexed: 12/14/2022]
Abstract
The immune system monitors the health of cells and is stimulated by necrosis. Here we examined the receptors and ligands driving this response. In a targeted screen of C-type lectin receptors, a Clec2d reporter responded to lysates from necrotic cells. Biochemical purification identified histones, both free and bound to nucleosomes or neutrophil extracellular traps, as Clec2d ligands. Clec2d recognized poly-basic sequences in histone tails and this recognition was sensitive to post-translational modifications of these sequences. As compared with WT mice, Clec2d-/- mice exhibited reduced proinflammatory responses to injected histones, and less tissue damage and improved survival in a hepatotoxic injury model. In macrophages, Clec2d localized to the plasma membrane and endosomes. Histone binding to Clec2d did not stimulate kinase activation or cytokine production. Rather, histone-bound DNA stimulated endosomal Tlr9-dependent responses in a Clec2d-dependent manner. Thus, Clec2d binds to histones released upon necrotic cell death, with functional consequences to inflammation and tissue damage.
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Affiliation(s)
- Jiann-Jyh Lai
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Freidrich M Cruz
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Kenneth L Rock
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
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Molecular and Cellular Bases of Immunosenescence, Inflammation, and Cardiovascular Complications Mimicking "Inflammaging" in Patients with Systemic Lupus Erythematosus. Int J Mol Sci 2019; 20:ijms20163878. [PMID: 31395799 PMCID: PMC6721773 DOI: 10.3390/ijms20163878] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/04/2019] [Accepted: 08/05/2019] [Indexed: 12/19/2022] Open
Abstract
Systemic lupus erythematosus (SLE) is an archetype of systemic autoimmune disease, characterized by the presence of diverse autoantibodies and chronic inflammation. There are multiple factors involved in lupus pathogenesis, including genetic/epigenetic predisposition, sexual hormone imbalance, environmental stimulants, mental/psychological stresses, and undefined events. Recently, many authors noted that "inflammaging", consisting of immunosenescence and inflammation, is a common feature in aging people and patients with SLE. It is conceivable that chronic oxidative stresses originating from mitochondrial dysfunction, defective bioenergetics, abnormal immunometabolism, and premature telomere erosion may accelerate immune cell senescence in patients with SLE. The mitochondrial dysfunctions in SLE have been extensively investigated in recent years. The molecular basis of normoglycemic metabolic syndrome has been found to be relevant to the production of advanced glycosylated and nitrosative end products. Besides, immunosenescence, autoimmunity, endothelial cell damage, and decreased tissue regeneration could be the results of premature telomere erosion in patients with SLE. Herein, the molecular and cellular bases of inflammaging and cardiovascular complications in SLE patients will be extensively reviewed from the aspects of mitochondrial dysfunctions, abnormal bioenergetics/immunometabolism, and telomere/telomerase disequilibrium.
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Advanced Glycation End Products of Bovine Serum Albumin Suppressed Th1/Th2 Cytokine but Enhanced Monocyte IL-6 Gene Expression via MAPK-ERK and MyD88 Transduced NF-κB p50 Signaling Pathways. Molecules 2019; 24:molecules24132461. [PMID: 31277476 PMCID: PMC6652144 DOI: 10.3390/molecules24132461] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/28/2019] [Accepted: 07/01/2019] [Indexed: 02/06/2023] Open
Abstract
Advanced glycation end products (AGE), the most known aging biomarker, may cause “inflamm-aging” (i.e., chronic low-grade inflammation that develops with aging) in both aged and diabetes groups. However, the molecular bases of inflamm-aging remain obscure. We prepared AGE by incubating BSA (0.0746 mmol/L) + glucose (0.5 mol/L) at 37 °C in 5% CO2–95% air for 1–180 days. The lysine glycation in BSA–AGE reached 77% on day 30 and 100% after day 130, whereas the glycation of arginine and cysteine was minimal. The Nε-(carboxymethyl)-lysine content in BSA–AGE was also increased with increasing number of incubation days. The lectin-binding assay revealed that the glycation of BSA not only altered the conformational structure, but lost binding capacity with various lectins. An immunological functional assay showed that BSA–AGE > 8 μg/mL significantly suppressed normal human Th1 (IL-2 and IFN-γ) and Th2 (IL-10) mRNA expression, whereas AGE > 0.5 μg/mL enhanced monocyte IL-6 production irrelevant to cell apoptosis. The AGE-enhanced monocyte IL-6 production was via MAPK–ERK and MyD88-transduced NF-κBp50 signaling pathways. To elucidate the structure–function relationship of BSA–AGE-enhanced IL-6 production, we pre-preincubated BSA–AGE with different carbohydrate-degrading, protein-degrading, and glycoprotein-degrading enzymes. We found that trypsin and carboxypeptidase Y suppressed whereas β-galactosidase enhanced monocyte IL-6 production. In conclusion, BSA–AGE exerted both immunosuppressive and pro-inflammatory effects that are the molecular basis of inflamm-aging in aged and diabetes groups.
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Desmons A, Okwieka A, Doué M, Gorisse L, Vuiblet V, Pietrement C, Gillery P, Jaisson S. Proteasome-dependent degradation of intracellular carbamylated proteins. Aging (Albany NY) 2019; 11:3624-3638. [PMID: 31170093 PMCID: PMC6594819 DOI: 10.18632/aging.102002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 05/27/2019] [Indexed: 12/28/2022]
Abstract
Carbamylation, which corresponds to the binding of isocyanic acid to the amino groups of proteins, is a nonenzymatic post-translational modification responsible for alterations of protein structural and functional properties. Tissue accumulation of carbamylation-derived products and their role in pathological processes such as atherosclerosis or chronic renal failure have been previously documented. However, few studies have focused on the carbamylation of intracellular proteins and their subsequent role in cellular aging. This study aimed to determine the extent of intracellular protein carbamylation, its impact on cell functions and the ability of cells to degrade these modified proteins. Fibroblasts were incubated with cyanate or urea and the carbamylation level was evaluated by immunostaining and homocitrulline quantification. The results showed that carbamylated proteins accumulated intracellularly and that all proteins were susceptible. The presence of intracellular carbamylated proteins did not modify cell proliferation or type I collagen synthesis nor did it induce cell senescence, but it significantly decreased cell motility. Fibroblasts were able to degrade carbamylated proteins through the ubiquitin-proteasome system. In conclusion, intracellular proteins are susceptible to carbamylation but their accumulation does not seem to deeply affect cell function, owing largely to their elimination by the ubiquitin-proteasome system.
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Affiliation(s)
- Aurore Desmons
- Laboratory of Biochemistry and Molecular Biology, CNRS/URCA UMR N° 7369 MEDyC, Faculty of Medicine, University of Reims Champagne-Ardenne, Reims, France
- Laboratory of Pediatric Biology and Research, University Hospital of Reims, Reims, France
| | - Anaïs Okwieka
- Laboratory of Biochemistry and Molecular Biology, CNRS/URCA UMR N° 7369 MEDyC, Faculty of Medicine, University of Reims Champagne-Ardenne, Reims, France
| | - Manon Doué
- Laboratory of Biochemistry and Molecular Biology, CNRS/URCA UMR N° 7369 MEDyC, Faculty of Medicine, University of Reims Champagne-Ardenne, Reims, France
| | - Laëtitia Gorisse
- Laboratory of Biochemistry and Molecular Biology, CNRS/URCA UMR N° 7369 MEDyC, Faculty of Medicine, University of Reims Champagne-Ardenne, Reims, France
- Present address: Department of Laboratory Medicine, National Institutes of Health, Bethesda, MD 20892, USA
| | - Vincent Vuiblet
- Laboratory of Biopathology, University Hospital of Reims, Reims, France
| | - Christine Pietrement
- Laboratory of Biochemistry and Molecular Biology, CNRS/URCA UMR N° 7369 MEDyC, Faculty of Medicine, University of Reims Champagne-Ardenne, Reims, France
- Department of Pediatrics (Nephrology unit), University Hospital of Reims, Reims, France
| | - Philippe Gillery
- Laboratory of Biochemistry and Molecular Biology, CNRS/URCA UMR N° 7369 MEDyC, Faculty of Medicine, University of Reims Champagne-Ardenne, Reims, France
- Laboratory of Pediatric Biology and Research, University Hospital of Reims, Reims, France
| | - Stéphane Jaisson
- Laboratory of Biochemistry and Molecular Biology, CNRS/URCA UMR N° 7369 MEDyC, Faculty of Medicine, University of Reims Champagne-Ardenne, Reims, France
- Laboratory of Pediatric Biology and Research, University Hospital of Reims, Reims, France
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Siddiqui Z, Faisal M, Alatar AA, Ahmad S. Glycation of hemoglobin leads to the immunogenicity as a result of neo-epitope generation. Int J Biol Macromol 2018; 123:427-435. [PMID: 30445080 DOI: 10.1016/j.ijbiomac.2018.11.063] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 11/11/2018] [Accepted: 11/11/2018] [Indexed: 02/08/2023]
Abstract
Non-enzymatic glycation occurs rapidly which ultimately leads to the formation of advanced glycation endproducts (AGEs). These AGEs have shown to associated with the development of many diseases such as diabetes-mellitus. This study is focused on immunological characterization of glycated-Hb induced by d-ribose. Here, we analysed the immunogenicity of glycated-Hb by direct binding and competitive inhibition ELISA. Direct binding ELISA confirmed that glycated-Hb was highly immunogenic and induced high titre antibodies as compared to native-Hb. The antigen binding specificity and cross reactivity of these antibodies were also screened by competitive inhibition ELISA. The IgG from rabbit sera showed enhanced binding of glycated-Hb than native-Hb. Thus, it is possible that alterations in Hb induced by d-ribose could have generated highly immunogenic neoepitopes. Moreover, induced antibodies were also found to cross-react with other modified/native proteins. On the basis of the results of this study, we presume that this type of structural perturbations in Hb in vivo by d-ribose might take place in untreated diabetic condition that could induce such type of immunogenic auto-antibodies. Furthermore, increased level of these auto-antibodies could serve as a biomarker in diabetes and its progression.
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Affiliation(s)
- Zeba Siddiqui
- Department of Biosciences, Integral University, Lucknow 226026, India; IIRC-1 Laboratory of Glycation Biology and Metabolic Disorders, Integral University, Lucknow 26026, India
| | - Mohammad Faisal
- Department of Botany & Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Abdulrahman A Alatar
- Department of Botany & Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Saheem Ahmad
- Department of Biosciences, Integral University, Lucknow 226026, India; IIRC-1 Laboratory of Glycation Biology and Metabolic Disorders, Integral University, Lucknow 26026, India.
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Islam S, Moinuddin, Mir AR, Arfat MY, Alam K, Ali A. Studies on glycoxidatively modified human IgG: Implications in immuno-pathology of type 2 diabetes mellitus. Int J Biol Macromol 2017; 104:19-29. [DOI: 10.1016/j.ijbiomac.2017.05.190] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 05/31/2017] [Indexed: 01/07/2023]
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Khan MA, Alam K, Zafaryab M, Rizvi MMA. Peroxynitrite-modified histone as a pathophysiological biomarker in autoimmune diseases. Biochimie 2017; 140:1-9. [DOI: 10.1016/j.biochi.2017.06.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 06/07/2017] [Indexed: 11/25/2022]
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Qin C, Qiu K, Sun W, Jiao N, Zhang X, Che L, Zhao H, Shen H, Yin J. A proteomic adaptation of small intestinal mucosa in response to dietary protein limitation. Sci Rep 2016; 6:36888. [PMID: 27841298 PMCID: PMC5107940 DOI: 10.1038/srep36888] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 10/21/2016] [Indexed: 12/14/2022] Open
Abstract
Dietary protein limitation (PL) is not only beneficial to human health but also applied to minimize nitrogen excretion in livestock production. However, the impact of PL on intestinal physiology is largely unknown. In this study, we identified 5275 quantitative proteins using a porcine model in which pigs suffered PL. A total of 202 proteins |log2 fold-change| > 1 were taken as differentially expressed proteins and subjected to functional and pathway enrichment analysis to reveal proteomic alterations of the jejunal mucosa. Combining with the results of western blotting analysis, we found that protein/carbohydrate digestion, intestinal mucosal tight junction and cell adhesion molecules, and the immune response to foreign antigens were increased in the jejunal mucosa of the pigs upon PL. In contrast, amino acid transport, innate and auto immunity, as well as cell proliferation and apoptosis were reduced. In addition, the expression of functional proteins that involved in DNA replication, transcription and mRNA splicing as well as translation were altered in the jejunal mucosa in response to PL. Furthermore, PL may reduce amino acid transport and cell proliferation through the depression of mTOR pathway. This study provides new insights into the molecular mechanisms underlying the small intestinal response to PL.
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Affiliation(s)
- Chunfu Qin
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, P. R. China
| | - Kai Qiu
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, P. R. China
| | - Wenjuan Sun
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, P. R. China
| | - Ning Jiao
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, P. R. China
| | - Xin Zhang
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, P. R. China
| | - Lianqiang Che
- Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an, 625099, P. R. China
| | - Haiyi Zhao
- Genecreate Biological Engineering Co., Ltd., National Bio-industry Base, Wuhan, 430075, P. R. China
| | - Hexiao Shen
- Genecreate Biological Engineering Co., Ltd., National Bio-industry Base, Wuhan, 430075, P. R. China
| | - Jingdong Yin
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, P. R. China
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Abstract
The receptor for advanced glycation end products (RAGE) is a novel protein increasingly studied in the pathogenesis of type 1 diabetes (T1D). RAGE is expressed by several immune cell types, including T cells, antigen-presenting cells, endothelial cells, and the endocrine cells of the pancreatic islets. RAGE binds various ligands including advanced glycation end products (AGEs), high-mobility group box protein 1 (HMGB1), S100 proteins, β-amyloid, β-sheet fibrils, and lipopolysaccharide. AGEs are a particularly interesting ligand because their exogenous introduction into the body can be accelerated by the consumption of AGE-rich processed foods. This review will detail RAGE isoforms and its ligands and discuss how RAGE binding on the aforementioned cells could be linked to T1D pathogenesis.
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Affiliation(s)
- Sherman S Leung
- Glycation and Diabetes, Mater Research Institute, Translational Research Institute, The University of Queensland, 37 Kent St, Woolloongabba, Brisbane, Queensland, Australia
- School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland, Australia
| | - Josephine M Forbes
- Glycation and Diabetes, Mater Research Institute, Translational Research Institute, The University of Queensland, 37 Kent St, Woolloongabba, Brisbane, Queensland, Australia.
- Mater Clinical School, School of Medicine, The University of Queensland, Brisbane, Queensland, Australia.
| | - Danielle J Borg
- Glycation and Diabetes, Mater Research Institute, Translational Research Institute, The University of Queensland, 37 Kent St, Woolloongabba, Brisbane, Queensland, Australia
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Jyoti, Mir AR, Habib S, Siddiqui SS, Ali A, Moinuddin. Neo-epitopes on methylglyoxal modified human serum albumin lead to aggressive autoimmune response in diabetes. Int J Biol Macromol 2016; 86:799-809. [PMID: 26861824 DOI: 10.1016/j.ijbiomac.2016.02.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 02/02/2016] [Accepted: 02/04/2016] [Indexed: 01/09/2023]
Abstract
Glyco-oxidation of proteins has implications in the progression of diabetes type 2. Human serum albumin is prone to glyco-oxidative attack by sugars and methylglyoxal being a strong glycating agent may have severe impact on its structure and consequent role in diabetes. This study has probed the methylglyoxal mediated modifications of HSA, the alterations in its immunological characteristics and possible role in autoantibody induction. We observed an exposure of chromophoric groups, loss in the fluorescence intensity, generation of AGEs, formation of cross-linked products, decrease in α-helical content, increase in hydrophobic clusters, FTIR band shift, attachment of methylglyoxal to HSA and the formation of N(ε)-(carboxyethyl) lysine in the modified HSA, when compared to the native albumin. MG-HSA was found to be highly immunogenic with additional immunogenicity invoking a highly specific immune response than its native counterpart. The binding characteristics of circulating autoantibodies in type 2 diabetes mellitus (DM) patients showed the generation of anti-MG-HSA auto-antibodies in the these patients, that are preferentially recognized by the modified albumin. We propose that MG induced structural perturbations in HSA, result in the generation of neo-epitopes leading to an aggressive auto-immune response and may contribute to the immunopathogenesis of diabetes type 2 associated complications.
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Affiliation(s)
- Jyoti
- Department of Biochemistry, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Abdul Rouf Mir
- Department of Biotechnology, Government Degree College, Baramulla, Jammu and Kashmir, India
| | - Safia Habib
- Department of Biochemistry, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Sheelu Shafiq Siddiqui
- Rajeev Gandhi Centre for Diabetes, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Asif Ali
- Department of Biochemistry, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Moinuddin
- Department of Biochemistry, Jawaharlal Nehru Medical College, Faculty of Medicine, Aligarh Muslim University, Aligarh, Uttar Pradesh, India.
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Mir AR, Moinuddin, Islam S. Circulating autoantibodies in cancer patients have high specificity for glycoxidation modified histone H2A. Clin Chim Acta 2016; 453:48-55. [DOI: 10.1016/j.cca.2015.12.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/27/2015] [Accepted: 12/03/2015] [Indexed: 11/15/2022]
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Xiao G, Zuo X. Epigenetics in systemic lupus erythematosus. Biomed Rep 2015; 4:135-139. [PMID: 26893827 DOI: 10.3892/br.2015.556] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 12/04/2015] [Indexed: 01/06/2023] Open
Abstract
Systemic lupus erythematosus (SLE) is a multisystem autoimmune disease, with mechanisms that remain to be elucidated. Previous studies have proposed that genes and environments are required for lupus to develop and flare. It has been found that epigenetics have a significant influence on SLE. The present review will concentrate on epigenetics in SLE. There are a number of studies reporting that autoreactive T cells and B cells in patients with SLE have evidence of altered patterns of DNA methylation, modifications of histones and microRNA (miRNA). Long noncoding RNAs (lncRNAs) are another type of noncoding RNAs, which have an important role in epigenetics. lncRNAs may possibly become a new hotspot in SLE.
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Affiliation(s)
- Gong Xiao
- Department of Rheumatology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
| | - Xiaoxia Zuo
- Department of Rheumatology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
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