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Alyahyawi AR, Khan MY, Alouffi S, Maarfi F, Akasha R, Khan S, Rafi Z, Alharazi T, Shahab U, Ahmad S. Identification of Glycoxidative Lesion in Isolated Low-Density Lipoproteins from Diabetes Mellitus Subjects. Life (Basel) 2023; 13:1986. [PMID: 37895368 PMCID: PMC10608319 DOI: 10.3390/life13101986] [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: 08/16/2023] [Revised: 09/09/2023] [Accepted: 09/14/2023] [Indexed: 10/29/2023] Open
Abstract
Methylglyoxal (MG) is a precursor for advanced glycation end-products (AGEs), which have a significant role in diabetes. The present study is designed to probe the immunological response of native and glycated low-density lipoprotein (LDL) in experimental animals. The second part of this study is to probe glycoxidative lesion detection in low-density lipoproteins (LDL) in diabetes subjects with varying disease duration. The neo-epitopes attributed to glycation-induced glycoxidative lesion of LDL in DM patients' plasma were, analyzed by binding of native and MG-modified LDL immunized animal sera antibodies using an immunochemical assay. The plasma purified human LDL glycation with MG, which instigated modification in LDL. Further, the NewZealand-White rabbits were infused with unmodified natural LDL (N-LDL) and MG-glycatedLDL to probe its immunogenicity. The glycoxidative lesion detection in LDL of DM with disease duration (D.D.) of 5-15 years and D.D. > 15 years was found to be significantly higher as compared to normal healthy subjects (NHS) LDL. The findings support the notion that prolonged duration of diabetes can cause structural alteration in LDL protein molecules, rendering them highly immunogenic in nature. The presence of LDL lesions specific to MG-associated glycoxidation would further help in assessing the progression of diabetes mellitus.
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Affiliation(s)
- Amjad R. Alyahyawi
- Department of Diagnostic Radiology, College of Applied Medical Science, University of Hail, Ha’il 2440, Saudi Arabia;
- Centre for Nuclear and Radiation Physics, Department of Physics, University of Surrey, Guildford GU2 7XH, UK
| | - Mohd Yasir Khan
- Department of Biotechnology, SALS, Uttaranchal University, Dehradun 248011, India;
| | - Sultan Alouffi
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, University of Hail, Ha’il 2440, Saudi Arabia; (S.A.); (R.A.); (T.A.)
| | - Farah Maarfi
- Department of Biotechnology, SALS, Uttaranchal University, Dehradun 248011, India;
| | - Rihab Akasha
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, University of Hail, Ha’il 2440, Saudi Arabia; (S.A.); (R.A.); (T.A.)
| | - Saif Khan
- Department of Basic Dental and Medical Sciences, College of Dentistry, Hail University, Ha’il 2440, Saudi Arabia;
| | - Zeeshan Rafi
- Department of Bioengineering, Integral University, Lucknow 226026, India;
| | - Talal Alharazi
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, University of Hail, Ha’il 2440, Saudi Arabia; (S.A.); (R.A.); (T.A.)
| | - Uzma Shahab
- Department of Biochemistry, King George Medical University, Lucknow 226026, India;
| | - Saheem Ahmad
- Department of Medical Laboratory Sciences, College of Applied Medical Sciences, University of Hail, Ha’il 2440, Saudi Arabia; (S.A.); (R.A.); (T.A.)
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2
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Stanciulescu LA, Scafa-Udriste A, Dorobantu M. Exploring the Association between Low-Density Lipoprotein Subfractions and Major Adverse Cardiovascular Outcomes—A Comprehensive Review. Int J Mol Sci 2023; 24:ijms24076669. [PMID: 37047642 PMCID: PMC10095470 DOI: 10.3390/ijms24076669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/30/2023] [Accepted: 03/31/2023] [Indexed: 04/05/2023] Open
Abstract
Cardiovascular disease (CVD) impacts hundreds of millions of people each year and is the main cause of death worldwide, with atherosclerosis being its most frequent form of manifestation. Low-density lipoproteins (LDL) have already been established as a significant cardiovascular risk factor, but more recent studies have shown that small, dense LDLs are the ones more frequently associated with a higher overall risk for developing atherosclerotic cardiovascular disease. Ever since atherogenic phenotypes were defined for the first time, LDL subfractions have been continuously analyzed in order to identify those with a higher atherogenic profile that could further become not only high-accuracy, effective prognostic biomarkers, but also treatment targets for novel lipid-lowering molecules. This review sets out to comprehensively evaluate the association between various LDL-subfractions and the risk of further developing major adverse cardiovascular events, by assessing both genetical and clinical features and focusing on their physiopathological characteristics, chemical composition, and global ability to predict long-term cardiovascular risk within the general population. Further research is required in order to establish the most beneficial range of LDL-C levels for both primary and secondary prevention, as well as to implement LDL subfraction testing as a routine protocol, separately from the general assessment of the other traditional cardiovascular risk factors.
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Affiliation(s)
- Laura Adina Stanciulescu
- Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania
- Cardiology Department, Emergency Clinical Hospital Bucharest, 014461 Bucharest, Romania
| | - Alexandru Scafa-Udriste
- Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania
- Cardiology Department, Emergency Clinical Hospital Bucharest, 014461 Bucharest, Romania
| | - Maria Dorobantu
- Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania
- Romanian Academy, 010071 Bucharest, Romania
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3
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Bonilha I, Hajduch E, Luchiari B, Nadruz W, Le Goff W, Sposito AC. The Reciprocal Relationship between LDL Metabolism and Type 2 Diabetes Mellitus. Metabolites 2021; 11:metabo11120807. [PMID: 34940565 PMCID: PMC8708656 DOI: 10.3390/metabo11120807] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 11/25/2021] [Accepted: 11/25/2021] [Indexed: 12/14/2022] Open
Abstract
Type 2 diabetes mellitus and insulin resistance feature substantial modifications of the lipoprotein profile, including a higher proportion of smaller and denser low-density lipoprotein (LDL) particles. In addition, qualitative changes occur in the composition and structure of LDL, including changes in electrophoretic mobility, enrichment of LDL with triglycerides and ceramides, prolonged retention of modified LDL in plasma, increased uptake by macrophages, and the formation of foam cells. These modifications affect LDL functions and favor an increased risk of cardiovascular disease in diabetic individuals. In this review, we discuss the main findings regarding the structural and functional changes in LDL particles in diabetes pathophysiology and therapeutic strategies targeting LDL in patients with diabetes.
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Affiliation(s)
- Isabella Bonilha
- Cardiology Division, Atherosclerosis and Vascular Biology Laboratory (AtheroLab), State University of Campinas (Unicamp), Campinas 13083-887, Brazil; (I.B.); (B.L.)
| | - Eric Hajduch
- Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, F-75006 Paris, France;
| | - Beatriz Luchiari
- Cardiology Division, Atherosclerosis and Vascular Biology Laboratory (AtheroLab), State University of Campinas (Unicamp), Campinas 13083-887, Brazil; (I.B.); (B.L.)
| | - Wilson Nadruz
- Cardiology Division, Cardiovascular Pathophysiology Laboratory, State University of Campinas (Unicamp), Campinas 13083-887, Brazil;
| | - Wilfried Le Goff
- Unité de Recherche sur les Maladies Cardiovasculaires, le Métabolisme et la Nutrition, ICAN, Inserm, Sorbonne Université, F-75013 Paris, France;
| | - Andrei C. Sposito
- Cardiology Division, Atherosclerosis and Vascular Biology Laboratory (AtheroLab), State University of Campinas (Unicamp), Campinas 13083-887, Brazil; (I.B.); (B.L.)
- Correspondence: ; Tel.: +55-19-3521-7098; Fax: +55-19-3289-410
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4
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C Thambiah S, Lai LC. Diabetic dyslipidaemia. Pract Lab Med 2021; 26:e00248. [PMID: 34368411 PMCID: PMC8326412 DOI: 10.1016/j.plabm.2021.e00248] [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: 12/31/2020] [Revised: 05/16/2021] [Accepted: 07/14/2021] [Indexed: 12/22/2022] Open
Abstract
Diabetes mellitus (DM) is an escalating pandemic and an established cardiovascular risk factor. An important aspect of the interaction between DM and atherosclerotic cardiovascular disease (ASCVD) is diabetic dyslipidaemia, an atherogenic dyslipidaemia encompassing quantitative [hypertriglyceridaemia (hyperTG) and decreased high density lipoprotein cholesterol (HDL)] and qualitative [increased small dense low density lipoprotein cholesterol (sdLDL) particles, large very low density lipoprotein cholesterol (VLDL) subfraction (VLDL1) and dysfunctional HDL] modifications in lipoproteins. Much of the pathophysiology linking DM and dyslipidaemia has been elucidated. This paper aims to review the pathophysiology and management of diabetic dyslipidaemia with respect to ASCVD. Briefly, the influence of diabetic kidney disease on lipid profile and lipid changes causing type 2 diabetes mellitus are highlighted. Biomarkers of diabetic dyslipidaemia, including novel markers and clinical trials that have demonstrated that non-lipid and lipid lowering therapies can lower cardiovascular risk in diabetics are discussed. The stands of various international guidelines on lipid management in DM are emphasised. It is important to understand the underlying mechanisms of diabetic dyslipidaemia in order to develop new therapeutic strategies against dyslipidaemia and diabetes. The various international guidelines on lipid management can be used to tailor a holistic approach specific to each patient with diabetic dyslipidaemia.
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Affiliation(s)
- Subashini C Thambiah
- Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Selangor, Malaysia
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5
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Cardiovascular Disease in Type 1 Diabetes Mellitus: Epidemiology and Management of Cardiovascular Risk. J Clin Med 2021; 10:jcm10081798. [PMID: 33924265 PMCID: PMC8074744 DOI: 10.3390/jcm10081798] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/09/2021] [Accepted: 04/18/2021] [Indexed: 02/06/2023] Open
Abstract
Cardiovascular disease (CVD) is a major cause of mortality in type 1 diabetes mellitus (T1DM) patients, and cardiovascular risk (CVR) remains high even in T1DM patients with good metabolic control. The underlying mechanisms remain poorly understood and known risk factors seem to operate differently in T1DM and type 2 diabetes mellitus (T2DM) patients. However, evidence of cardiovascular risk assessment and management in T1DM patients often is extrapolated from studies on T2DM patients or the general population. In this review, we examine the existing literature about the prevalence of clinical and subclinical CVD, as well as current knowledge about potential risk factors involved in the development and progression of atherosclerosis in T1DM patients. We also discuss current approaches to the stratification and therapeutic management of CVR in T1DM patients. Chronic hyperglycemia plays an important role, but it is likely that other potential factors are involved in increased atherosclerosis and CVD in T1DM patients. Evidence on the estimation of 10-year and lifetime risk of CVD, as well as the efficiency and age at which current cardiovascular medications should be initiated in young T1DM patients, is very limited and clearly insufficient to establish evidence-based therapeutic approaches to CVD management.
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6
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Rehman S, Alouffi S, Faisal M, Qahtan AA, Alatar AA, Ahmad S. Methylglyoxal mediated glycation leads to neo-epitopes generation in fibrinogen: Role in the induction of adaptive immune response. Int J Biol Macromol 2021; 175:535-543. [PMID: 33529635 DOI: 10.1016/j.ijbiomac.2021.01.197] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/26/2021] [Accepted: 01/28/2021] [Indexed: 01/12/2023]
Abstract
In diabetes mellitus, hyperglycemia mediated non-enzymatic glycosylation of proteins results in the pathogenesis of diabetes-associated secondary complications via the generation of advanced glycation end products (AGEs). The focus of this study is to reveal the immunological aspects of methylglyoxal (MG) mediated glycation of fibrinogen protein. The induced immunogenicity of modified fibrinogen is analyzed by direct binding and inhibition ELISA. Direct binding ELISA confirmed that MG glycated fibrinogen (MG-Fib) is highly immunogenic and induces a high titer of antibodies in comparison to its native analog. Cross-reactivity and antigen-binding specificity of induced antibodies were confirmed by inhibition ELISA. The enhanced affinity of immunoglobulin G (IgG) from immunized rabbits' sera and MG glycated fibrinogen is probably the aftermath of neo-epitopes generation in the native structure of protein upon modification. Thus, we deduce that under the glycative stress, MG-mediated structural alterations in fibrinogen could induce the generation of antibodies which might serve as a potential biomarker in diabetes mellitus and its associated secondary disorders.
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Affiliation(s)
- Shahnawaz Rehman
- IIRC-1, Laboratory of Glycation Biology and Metabolic Disorder, Integral University, Lucknow, Uttar Prade sh-226026, India
| | - Sultan Alouffi
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, University of Hail, Saudi Arabia; Molecular Diagnostic & Personalized Therapeutic Unit, University of Hail, Saudi Arabia
| | - Mohammad Faisal
- Department of Botany and Microbiology, College of Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Ahmed A Qahtan
- Department of Botany and Microbiology, College of Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Abdulrahman A Alatar
- Department of Botany and Microbiology, College of Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Saheem Ahmad
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, University of Hail, Saudi Arabia.
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7
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Li Y, Rao Y, Zhu H, Jiang B, Zhu M. USP16 Regulates the Stability and Function of LDL receptor by Deubiquitination. Int Heart J 2020; 61:1034-1040. [PMID: 32999190 DOI: 10.1536/ihj.20-043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Low-density lipoprotein (LDL) particles are known to be atherogenic agents in coronary artery diseases. They adjust to other electronegative forms and can be the subject for the enhancement of inflammatory events in vessel subendothelial spaces. The LDL uptake is related to the membrane scavenger receptors, including LDL receptor (LDLR). The LDLR expression is closely associated with LDL uptake and occurrence of diseases, such as atherosclerotic cardiovascular diseases. Our findings identified USP16 as a novel regulator of LDLR due to its ability to prevent ubiquitylation-dependent LDLR degradation, further promoting the uptake of LDL. The enhancement of USP16-mediated deubiquitination andthe suppressive degradation of the LDLR cause the presentation of a potential strategy to increase LDL cholesterol clearance.
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Affiliation(s)
- Yongsheng Li
- Department of Cardiovascular Internal Medicine, The Fifth Hospital of Xiamen
| | - Yanbiao Rao
- Department of Cardiovascular Internal Medicine, The Fifth Hospital of Xiamen
| | - Hongtao Zhu
- Department of Cardiovascular Internal Medicine, The Fifth Hospital of Xiamen
| | - Bingyuan Jiang
- Department of Cardiovascular Internal Medicine, The Fifth Hospital of Xiamen
| | - Maoshu Zhu
- Central Laboratory, The Fifth Hospital of Xiamen
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8
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Perween S, Abidi M, Faizy AF, Moinuddin. Post-translational modifications on glycated plasma fibrinogen: A physicochemical insight. Int J Biol Macromol 2019; 126:1201-1212. [DOI: 10.1016/j.ijbiomac.2019.01.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 12/11/2018] [Accepted: 01/04/2019] [Indexed: 12/29/2022]
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9
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Luo W, He Y, Ding F, Nie X, Li XL, Song HL, Li GX. Study on the levels of glycosylated lipoprotein in patients with coronary artery atherosclerosis. J Clin Lab Anal 2018; 33:e22650. [PMID: 30101436 DOI: 10.1002/jcla.22650] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 07/20/2018] [Accepted: 07/22/2018] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND The main risk factors for atherosclerosis patients are not fully explicated. The aim of this study was to analyze the levels of blood lipid and glycosylated lipoprotein in patients with coronary artery atherosclerosis and healthy individuals and to study the relationship between the glycosylated lipoprotein and atherosclerosis. METHODS The study involved 200 patients diagnosed with myocardial infarction caused by coronary atherosclerosis as case group and 230 healthy individuals as control group. We analyzed and contrasted the levels of blood lipid and glycosylated lipoprotein between the different groups. In addition, we investigated the correlation between glycosylated low-density lipoprotein (G-LDL) and glucose levels. RESULTS There is no statistical difference between the level of TG in case group and control group. The level of CHOL, HDL-C, and LDL-C in case group is significantly lower than that in control group (3.90 [3.23, 4.42] vs 5.16 [4.86, 5.77] [mmol/L]; 1.09 [0.83, 1.38] vs 1.46 [1.15, 1.80] [mmol/L]; 2.22 [1.68, 2.81] vs 2.95 [2.60, 3.27] [mmol/L]) (P < 0.05). The level of GLU, HbA1c, G-HDL, and G-LDL in case group is significantly higher than that in control group (7.10 [5.68, 9.27] vs 4.84 [4.68, 5.07] [mmol/L]; 6.8 [6.3, 7.4] vs 5.9 [5.6, 6.1] [%]; 30.08 [25.04, 40.17] vs 22.95 [18.14, 27.06] [ng/mL], 6.26 [4.95, 7.50] vs 3.61 [2.66, 5.15] [ng/mL]) (p < 0.05). The level of G-LDL in patients with coronary atherosclerosis was relevant with the level of GLU and HbA1c (r = 0.625, 0.706, P < 0.05), and there was no relevance with LDL-C (r = 0.331, P > 0.05). CONCLUSION Hyperlipidemia is not an important cause of coronary atherosclerosis. High glucose levels and glycosylated lipoprotein are of high importance in the development and progression of coronary atherosclerosis.
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Affiliation(s)
- Wei Luo
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Yong He
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Fei Ding
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Xin Nie
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Xiao-Ling Li
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Hao-Lan Song
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
| | - Gui-Xing Li
- Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, China
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10
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Abstract
Methylglyoxal (MGO), a reactive dicarbonyl metabolite is a potent arginine directed glycating agent which has implications for diabetes-related complications. Dicarbonyl metabolites are produced endogenously and in a state of misbalance, they contribute to cell and tissue dysfunction through protein and DNA modifications causing dicarbonyl stress. MGO is detoxified by glyoxalase 1 (GLO1) system in the cytoplasm. Reactive oxygen species (ROS) are known to aggravate the glycation process. Both the processes are closely linked, and their combined activity is often referred to as "glycoxidation" process. Glycoxidation of proteins has several consequences such as type 2 diabetes mellitus (T2DM), aging etc. In this study, we have investigated the glycation of low-density lipoprotein (LDL) using different concentrations of MGO for varied incubation time periods. The structural perturbations induced in LDL were analyzed by UV-Vis, fluorescence, circular dichroism spectroscopy, molecular docking studies, polyacrylamide gel electrophoresis, FTIR, thermal denaturation studies, Thioflavin T assay and isothermal titration calorimetry. The ketoamine moieties, carbonyl content and HMF content were quantitated in native and glycated LDL. Simulation studies were also done to see the effect of MGO on the secondary structure of the protein. We report structural perturbations, increased carbonyl content, ketoamine moieties and HMF content in glycated LDL as compared to native analog (native LDL). We report the structural perturbations in LDL upon modification with MGO which could obstruct its normal physiological functions and hence contribute to disease pathogenesis and associated complications.
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11
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Son DJ, Hwang SY, Kim MH, Park UK, Kim BS. Anti-Diabetic and Hepato-Renal Protective Effects of Ziyuglycoside II Methyl Ester in Type 2 Diabetic Mice. Nutrients 2015. [PMID: 26198246 PMCID: PMC4517009 DOI: 10.3390/nu7075232] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Type 2 diabetes is a metabolic disorder caused by abnormal carbohydrate metabolism, and closely associated with abnormal lipid metabolism and hepato-renal dysfunction. This study investigated the anti-diabetic and hepato-renal protective properties of ziyuglycoside I (ZG01) derivative on type 2 diabetes. ZG01 was isolated from roots of Sanguisorba officinalis and chemically modified by deglycosylation and esterification to obtained ziyuglycoside II methyl ester (ZG02-ME). Here, we showed that ZG02-ME has stronger anti-diabetic activity than the original compound (ZG01) through decreasing blood glucose, glycated hemoglobin (HbA1c), and insulin levels in a mouse model of type 2 diabetes (db/db mice). We further found that ZG02-ME treatment effectively ameliorated serum insulin, leptin and C-peptide levels, which are key metabolic hormones, in db/db mice. In addition, we showed that elevated basal blood lipid levels were decreased by ZG02-ME treatment in db/db mice. Furthermore, treatment of ZG02-ME significantly decreased serum AST, ALT, BUN, creatinine, and liver lipid peroxidation in db/db mice. These results demonstrated that compared to ZG01, chemically modified ZG02-ME possess improved anti-diabetic properties, and has hepato-renal protective activities in type 2 diabetes.
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Affiliation(s)
- Dong Ju Son
- College of Pharmacy & Medical Research Center, Chungbuk National University, Cheongju, Chungbuk 361-951, Korea.
| | - Seock Yeon Hwang
- Department of Biomedical Laboratory Science, College of Natural Science, Daejeon University, Daejeon 300-716, Korea.
| | - Myung-Hyun Kim
- Department of Physiology, College of Korean Medicine, Daejeon University, Daejeon 300-716, Korea.
| | - Un Kyu Park
- Department of Biomedical Laboratory Science, College of Natural Science, Daejeon University, Daejeon 300-716, Korea.
| | - Byoung Soo Kim
- Department of Physiology, College of Korean Medicine, Daejeon University, Daejeon 300-716, Korea.
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12
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Fang L, Neutzner A, Turtschi S, Flammer J, Mozaffarieh M. Comet assay as an indirect measure of systemic oxidative stress. J Vis Exp 2015:e52763. [PMID: 26065491 PMCID: PMC4542923 DOI: 10.3791/52763] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Higher eukaryotic organisms cannot live without oxygen; yet, paradoxically, oxygen can be harmful to them. The oxygen molecule is chemically relatively inert because it has two unpaired electrons located in different pi * anti-bonding orbitals. These two electrons have parallel spins, meaning they rotate in the same direction about their own axes. This is why the oxygen molecule is not very reactive. Activation of oxygen may occur by two different mechanisms; either through reduction via one electron at a time (monovalent reduction), or through the absorption of sufficient energy to reverse the spin of one of the unpaired electrons. This results in the production of reactive oxidative species (ROS). There are a number of ways in which the human body eliminates ROS in its physiological state. If ROS production exceeds the repair capacity, oxidative stress results and damages different molecules. There are many different methods by which oxidative stress can be measured. This manuscript focuses on one of the methods named cell gel electrophoresis, also known as “comet assay” which allows measurement of DNA breaks. If all factors known to cause DNA damage, other than oxidative stress are kept constant, the amount of DNA damage measured by comet assay is a good parameter of oxidative stress. The principle is simple and relies upon the fact that DNA molecules are negatively charged. An intact DNA molecule has such a large size that it does not migrate during electrophoresis. DNA breaks, however, if present result in smaller fragments which move in the electrical field towards the anode. Smaller fragments migrate faster. As the fragments have different sizes the final result of the electrophoresis is not a distinct line but rather a continuum with the shape of a comet. The system allows a quantification of the resulting “comet” and thus of the DNA breaks in the cell.
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Affiliation(s)
- Lei Fang
- Department of Ophthalmology, University of Basel; Department of Biomedicine, University of Basel
| | - Albert Neutzner
- Department of Ophthalmology, University of Basel; Department of Biomedicine, University of Basel
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13
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Orekhov AN, Bobryshev YV, Sobenin IA, Melnichenko AA, Chistiakov DA. Modified low density lipoprotein and lipoprotein-containing circulating immune complexes as diagnostic and prognostic biomarkers of atherosclerosis and type 1 diabetes macrovascular disease. Int J Mol Sci 2014; 15:12807-41. [PMID: 25050779 PMCID: PMC4139876 DOI: 10.3390/ijms150712807] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Revised: 06/29/2014] [Accepted: 07/03/2014] [Indexed: 12/14/2022] Open
Abstract
In atherosclerosis; blood low-density lipoproteins (LDL) are subjected to multiple enzymatic and non-enzymatic modifications that increase their atherogenicity and induce immunogenicity. Modified LDL are capable of inducing vascular inflammation through activation of innate immunity; thus, contributing to the progression of atherogenesis. The immunogenicity of modified LDL results in induction of self-antibodies specific to a certain type of modified LDL. The antibodies react with modified LDL forming circulating immune complexes. Circulating immune complexes exhibit prominent immunomodulatory properties that influence atherosclerotic inflammation. Compared to freely circulating modified LDL; modified LDL associated with the immune complexes have a more robust atherogenic and proinflammatory potential. Various lipid components of the immune complexes may serve not only as diagnostic but also as essential predictive markers of cardiovascular events in atherosclerosis. Accumulating evidence indicates that LDL-containing immune complexes can also serve as biomarker for macrovascular disease in type 1 diabetes.
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Affiliation(s)
- Alexander N Orekhov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow 125315, Russia.
| | - Yuri V Bobryshev
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow 125315, Russia.
| | - Igor A Sobenin
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow 125315, Russia.
| | - Alexandra A Melnichenko
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, Russian Academy of Medical Sciences, Moscow 125315, Russia.
| | - Dimitry A Chistiakov
- Department of Medical Nanobiotechnology, Pirogov Russian State Medical University, Moscow 117997, Russia.
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14
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Wu C, Zhang X, Zhang X, Luan H, Sun G, Sun X, Wang X, Guo P, Xu X. The caffeoylquinic acid-rich Pandanus tectorius fruit extract increases insulin sensitivity and regulates hepatic glucose and lipid metabolism in diabetic db/db mice. J Nutr Biochem 2013; 25:412-9. [PMID: 24629909 DOI: 10.1016/j.jnutbio.2013.12.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 12/02/2013] [Accepted: 12/02/2013] [Indexed: 12/31/2022]
Abstract
Caffeoylquinic acids (CQAs) are widely distributed in various foods. While some CQAs have been shown to possess antihyperglycemic activities, whether it is beneficial for diabetes patients to ingest CQA-rich foods has still to be known. In this work, the antihyperglycemic and antihyperlipidemic effects of CQA-rich Pandanus tectorius fruit extract (PTF) was investigated in diabetic db/db mice. Treatment with PTF (200 mg/kg) significantly decreased body weight and fasting glucose level, alleviated hyperinsulinism and hyperlipidemia and declined glucose area under the curve in oral glucose tolerance test and insulin tolerance test. The elevated levels of serum proinflammatory cytokines and islet hypertrophy in db/db mice were remarkably attenuated by PTF treatment. Biochemical analysis showed that administration of PTF significantly stimulated the phosphorylation of AMP-activated protein kinase (AMPK) and Akt substract of 160 kDa (AS160), and enhanced the expression and translocation of glucose transporter type 4 (GLUT4) in skeletal muscles. It also increased the activity of hexokinase, decreased the expression of glucose 6-phosphatase and phosphoenolpyruvate carboxykinase and switched the transcription of several key lipid metabolic genes in the liver, which, in turn, improved hepatic glucose and lipid profiles as determined by nuclear magnetic resonance-based metabolomics. Overall, the CQA-rich PTF is beneficial for the treatment of diabetes. It may alleviate hyperglycemia and dyslipidemia via activation of AMPK-AS160-GLUT4 pathway in skeletal muscles and inhibition of gluconeogenesis and lipogenesis in the liver.
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Affiliation(s)
- Chongming Wu
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China
| | - Xiaopo Zhang
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China
| | - Xue Zhang
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China
| | - Hong Luan
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China
| | - Guibo Sun
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China
| | - Xiaobo Sun
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China
| | - Xiaoliang Wang
- Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
| | - Peng Guo
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China.
| | - Xudong Xu
- Pharmacology and Toxicology Research Center, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100094, China.
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