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Yan J, Yang S, Han L, Ba X, Shen P, Lin W, Li T, Zhang R, Huang Y, Huang Y, Qin K, Wang Y, Tu S, Chen Z. Dyslipidemia in rheumatoid arthritis: the possible mechanisms. Front Immunol 2023; 14:1254753. [PMID: 37954591 PMCID: PMC10634280 DOI: 10.3389/fimmu.2023.1254753] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 10/09/2023] [Indexed: 11/14/2023] Open
Abstract
Rheumatoid arthritis (RA) is an autoimmune inflammatory disease, of which the leading cause of death is cardiovascular disease (CVD). The levels of total cholesterol (TC), low-density lipoprotein cholesterol (LDL-c), and high-density lipoprotein cholesterol (HDL-c) in RA decrease especially under hyperinflammatory conditions. It is conflictive with the increased risk of CVD in RA, which is called "lipid paradox". The systemic inflammation may explain this apparent contradiction. The increased systemic proinflammatory cytokines in RA mainly include interleukin-6(IL-6)、interleukin-1(IL-1)and tumor necrosis factor alpha(TNF-α). The inflammation of RA cause changes in the subcomponents and structure of HDL particles, leading to a weakened anti-atherosclerosis function and promoting LDL oxidation and plaque formation. Dysfunctional HDL can further worsen the abnormalities of LDL metabolism, increasing the risk of cardiovascular disease. However, the specific mechanisms underlying lipid changes in RA and increased CVD risk remain unclear. Therefore, this article comprehensively integrates the latest existing literature to describe the unique lipid profile of RA, explore the mechanisms of lipid changes, and investigate the impact of lipid changes on cardiovascular disease.
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Affiliation(s)
- Jiahui Yan
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Sisi Yang
- Department of Geriatrics, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Liang Han
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Xin Ba
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Pan Shen
- Department of Rheumatology and Immunology, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Weiji Lin
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Tingting Li
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Ruiyuan Zhang
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Ying Huang
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Yao Huang
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Kai Qin
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Yu Wang
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Shenghao Tu
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
| | - Zhe Chen
- Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, China
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Takata K, Imaizumi S, Iwata A, Zhang B, Kawachi E, Miura SI, Ogawa M. Associations of High-Density Lipoprotein Functionality with Coronary Plaque Characteristics in Diabetic Patients with Coronary Artery Disease: Integrated Backscatter Intravascular Ultrasound Analysis. Biomolecules 2023; 13:1278. [PMID: 37759677 PMCID: PMC10526738 DOI: 10.3390/biom13091278] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/16/2023] [Accepted: 08/20/2023] [Indexed: 09/29/2023] Open
Abstract
High-density lipoprotein (HDL) functionality has been reported to be associated with coronary artery disease (CAD). However, little is known about the impact of HDL functionality on coronary atherosclerosis. Thirty-eight type 2 diabetic patients with CAD who underwent percutaneous coronary intervention were examined. Coronary atheroma burden and plaque composition of the culprit lesions were assessed using conventional gray-scale and integrated backscatter intravascular ultrasound. HDL-mediated cholesterol efflux capacity (HDL-CEC) and HDL antioxidant capacity, estimated as HDL inflammatory index (HII), were examined. The associations between HDL functionality and coronary plaques were analyzed using multivariate data analysis, including principal components analysis and orthogonal partial least squares (OPLS) models. Percent atheroma volume was correlated with HDL-CEC (r = 0.34, p = 0.04) but not with HII (p = 0.65). The OPLS model demonstrated that the percentage lipid volume was significantly associated with HDL functionality [coefficient (95% confidence interval); HDL-CEC: -0.26 (-0.49, -0.04); HII: 0.34 (0.08, 2.60), respectively]. HII exhibited the highest variable importance in projection score, indicating the greatest contribution. HDL functionality was associated with coronary plaque composition, a key component of plaque vulnerability. Our findings highlight the potential importance of HDL functionality for coronary plaque stabilization.
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Affiliation(s)
- Kohei Takata
- Department of Cardiology, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan; (K.T.); (S.-i.M.); (M.O.)
- Department of Clinical Laboratory and Transfusion, Fukuoka University Hospital, Fukuoka 814-0180, Japan
| | - Satoshi Imaizumi
- Department of Cardiology, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan; (K.T.); (S.-i.M.); (M.O.)
- Department of Bioethics and Medical Ethics, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan
| | - Atsushi Iwata
- Department of Cardiology, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan; (K.T.); (S.-i.M.); (M.O.)
- Fukuoka University Health Care Center, Fukuoka 814-0180, Japan
| | - Bo Zhang
- Information Technology Center, Fukuoka University, Fukuoka 814-0180, Japan
- Department of Biochemistry, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan
| | - Emi Kawachi
- Department of Bioethics and Medical Ethics, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan
| | - Shin-ichiro Miura
- Department of Cardiology, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan; (K.T.); (S.-i.M.); (M.O.)
| | - Masahiro Ogawa
- Department of Cardiology, Fukuoka University School of Medicine, Fukuoka 814-0180, Japan; (K.T.); (S.-i.M.); (M.O.)
- Department of Clinical Laboratory and Transfusion, Fukuoka University Hospital, Fukuoka 814-0180, Japan
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Huang C, Zhang J, Huang J, Li H, Wen K, Bao J, Wu X, Sun R, Abudukeremu A, Wang Y, He Z, Chen Q, Huang X, Wang H, Zhang Y. Proteomic and functional analysis of HDL subclasses in humans and rats: a proof-of-concept study. Lipids Health Dis 2023; 22:86. [PMID: 37386457 DOI: 10.1186/s12944-023-01829-9] [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: 12/07/2022] [Accepted: 05/07/2023] [Indexed: 07/01/2023] Open
Abstract
BACKGROUND The previous study investigated whether the functions of small, medium, and large high density lipoprotein (S/M/L-HDL) are correlated with protein changes in mice. Herein, the proteomic and functional analyses of high density lipoprotein (HDL) subclasses were performed in humans and rats. METHODS After purifying S/M/L-HDL subclasses from healthy humans (n = 6) and rats (n = 3) using fast protein liquid chromatography (FPLC) with calcium silica hydrate (CSH) resin, the proteomic analysis by mass spectrometry was conducted, as well as the capacities of cholesterol efflux and antioxidation was measured. RESULTS Of the 120 and 106 HDL proteins identified, 85 and 68 proteins were significantly changed in concentration among the S/M/L-HDL subclasses in humans and rats, respectively. Interestingly, it was found that the relatively abundant proteins in the small HDL (S-HDL) and large HDL (L-HDL) subclasses did not overlap, both in humans and in rats. Next, by searching for the biological functions of the relatively abundant proteins in the HDL subclasses via Gene Ontology, it was displayed that the relatively abundant proteins involved in lipid metabolism and antioxidation were enriched more in the medium HDL (M-HDL) subclass than in the S/L-HDL subclasses in humans, whereas in rats, the relatively abundant proteins associated with lipid metabolism and anti-oxidation were enriched in M/L-HDL and S/M-HDL, respectively. Finally, it was confirmed that M-HDL and L-HDL had the highest cholesterol efflux capacity among the three HDL subclasses in humans and rats, respectively; moreover, M-HDL exhibited higher antioxidative capacity than S-HDL in both humans and rats. CONCLUSIONS The S-HDL and L-HDL subclasses are likely to have different proteomic components during HDL maturation, and results from the proteomics-based comparison of the HDL subclasses may explain the associated differences in function.
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Affiliation(s)
- Canxia Huang
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Critical Care Medicine Department, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Jie Zhang
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Jingjing Huang
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Hongwei Li
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Kexin Wen
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Jinlan Bao
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Comprehensive Department, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Xiaoying Wu
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Runlu Sun
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Ayiguli Abudukeremu
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Yue Wang
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Zhijian He
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Qiaofei Chen
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Xinyi Huang
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China
| | - Hong Wang
- Centers for Metabolic & Cardiovascular Research, Department of Pharmacology, Temple University School of Medicine, Philadelphia, PA, 19140, USA.
| | - Yuling Zhang
- Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China.
- Department of Cardiology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, 510120, China.
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White CR, Palgunachari M, Wolkowicz P, Anantharamaiah GM. Peptides as Therapeutic Agents for Atherosclerosis. Methods Mol Biol 2022; 2419:89-110. [PMID: 35237960 DOI: 10.1007/978-1-0716-1924-7_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
More than three decades ago, as a test for the amphipathic helix theory, an 18 amino acid residue peptide and its analogs were designed with no sequence homology to any of the exchangeable apolipoproteins. Based on the apolipoprotein A-I (the major protein component of high density lipoproteins, HDL) mimicking properties, they were termed as ApoA-I mimicking peptides. Several laboratories around the world started studying such de novo-designed peptides for their antiatherogenic properties. The present chapter describes the efforts in bringing these peptides as therapeutic agents for atherosclerosis and several lipid-mediated disorders.
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Affiliation(s)
- C Roger White
- Department of Medicine, UAB Medical Centre, Birmingham, AL, USA
| | | | - Paul Wolkowicz
- Department of Medicine, UAB Medical Centre, Birmingham, AL, USA
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5
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Van Valkenburgh J, Meuret C, Martinez AE, Kodancha V, Solomon V, Chen K, Yassine HN. Understanding the Exchange of Systemic HDL Particles Into the Brain and Vascular Cells Has Diagnostic and Therapeutic Implications for Neurodegenerative Diseases. Front Physiol 2021; 12:700847. [PMID: 34552500 PMCID: PMC8450374 DOI: 10.3389/fphys.2021.700847] [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: 04/26/2021] [Accepted: 07/29/2021] [Indexed: 12/02/2022] Open
Abstract
High-density lipoproteins (HDLs) are complex, heterogenous lipoprotein particles, consisting of a large family of apolipoproteins, formed in subspecies of distinct shapes, sizes, and functions and are synthesized in both the brain and the periphery. HDL apolipoproteins are important determinants of Alzheimer’s disease (AD) pathology and vascular dementia, having both central and peripheral effects on brain amyloid-beta (Aβ) accumulation and vascular functions, however, the extent to which HDL particles (HLD-P) can exchange their protein and lipid components between the central nervous system (CNS) and the systemic circulation remains unclear. In this review, we delineate how HDL’s structure and composition enable exchange between the brain, cerebrospinal fluid (CSF) compartment, and vascular cells that ultimately affect brain amyloid metabolism and atherosclerosis. Accordingly, we then elucidate how modifications of HDL-P have diagnostic and therapeutic potential for brain vascular and neurodegenerative diseases.
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Affiliation(s)
- Juno Van Valkenburgh
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Cristiana Meuret
- Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Ashley E Martinez
- Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Vibha Kodancha
- Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Victoria Solomon
- Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Kai Chen
- Department of Radiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
| | - Hussein N Yassine
- Department of Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
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6
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Acar B, Yayla C, Gul M, Karanfil M, Unal S, Uçar F, Kuyumcu SM, Ertem AG, Ozen Y, Ozbay MB, Ozeke O, Aydogdu S. Monocyte-to-HDL-cholesterol ratio is associated with Ascending Aorta Dilatation in Patients with Bicuspid Aortic Valve. Afr Health Sci 2021; 21:96-104. [PMID: 34394286 PMCID: PMC8356613 DOI: 10.4314/ahs.v21i1.14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND The importance of monocyte count-to-HDL-cholesterol ratio (MHR) in cardio- vascular diseases has been shown in various studies. Ascending aortic dilatation (AAD) is a common complication in the patients with bicuspid aortic valve. In this study, we aimed to investigate the relationship between MHR and the presence of aortic dilatation in the patients with bicuspid aortic valve. METHODS The study population included totally 347 patients with bicuspid aortic valve.169 patients with aortic dilatation (ascending aorta diameter ≥ 4.0 cm) and 178 patients with no aortic dilatation. Echocardiographic and laboratory measurement was done and compared between groups. RESULTS The mean age of the participants was 44.7 ± 15.4 years and average ascending aorta diameter was 3.2 ± 0.3 cm in dilatation negative group and 4.4 ± 0.4 cm in positive group. MHR was significantly increased in in patients with aortic dilatation. MHR and uric acid level was independently associated with the presence of aortic dilatation in the patients with bicuspid aortic valve. CONCLUSION We found a significant relationship between MHR and aortic dilatation in the patients with bicuspid aortic valve.
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Affiliation(s)
- Burak Acar
- Department of Cardiology, Faculty of Medicine, Kocaeli University, Kocaeli/Turkey
| | - Cagrı Yayla
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
| | - Murat Gul
- Department of Cardiology, Aksaray University, Aksaray/Turkey
| | - Mustafa Karanfil
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
| | - Sefa Unal
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
| | - Fatih Uçar
- Department of Cardiology, Trakya University, Edirne/Turkey
| | | | - Ahmet Goktug Ertem
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
| | - Yasin Ozen
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
| | - Mustafa Bilal Ozbay
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
| | - Ozcan Ozeke
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
| | - Sinan Aydogdu
- Department of Cardiology, Yuksek Ihtisas Education and Research Hospital, Ankara/Turkey
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7
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Li Y, Huang YS, He B, Liu R, Qu G, Yin Y, Shi J, Hu L, Jiang G. Cadmium-binding proteins in human blood plasma. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109896. [PMID: 31704329 DOI: 10.1016/j.ecoenv.2019.109896] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/10/2019] [Accepted: 10/28/2019] [Indexed: 06/10/2023]
Abstract
Blood is the transmission medium for metal contaminants to and from bodily organs; as such, it can provide useful and reliable information about their bio-kinetics as they're distributed throughout the body. Metals can interact with endogenous proteins present in the blood, and these metal-protein complexes often dictate the fates of the introduced metals. The aim of this study was to investigate cadmium-binding protein characteristics in normal human plasma. Cadmium-binding plasma proteins in two different groups: normal human plasma (n = 29), and normal paired maternal and fetal umbilical cord plasmas (n = 3), were analyzed. In order to detect cadmium-binding plasma proteins present in low concentrations, blood plasma samples were first depleted of their two most abundant proteins - albumin and immunoglobulin G. Both the crude and depleted plasma samples were analyzed using column gel electrophoresis in conjunction with Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). One cadmium-binding protein was detected in 11 of 29 normal plasma samples and all three paired maternal and cord plasma samples. This protein was further identified as apolipoprotein A-I by high-resolution mass spectrometry. To the best of our knowledge, this is the first study to reveal cadmium-binding proteins in real human blood plasma, which is extremely critical to our understanding of cadmium transportation and accumulation in human blood.
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Affiliation(s)
- Yiling Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Yong-Shun Huang
- Department of Occupational Medicine, Guangdong Province Hospital for Occupational Disease Prevention and Treatment, Guangzhou, Guangdong, 510300, China
| | - Bin He
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Runzeng Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Guangbo Qu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Yongguang Yin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Jianbo Shi
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Ligang Hu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Institute of Environment and Health, Jianghan University, Wuhan, 430056, China.
| | - Guibin Jiang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
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8
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Palmer JC, Green RA, Boscher F, Poole-Warren LA, Carter PM, Enke YL, Lovell NH, Lord MS. Development and performance of a biomimetic artificial perilymph for in vitro testing of medical devices. J Neural Eng 2019; 16:026006. [DOI: 10.1088/1741-2552/aaf482] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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9
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Sakellarios AI, Raber L, Bourantas CV, Exarchos TP, Athanasiou LS, Pelosi G, Koskinas KC, Parodi O, Naka KK, Michalis LK, Serruys PW, Garcia-Garcia HM, Windecker S, Fotiadis DI. Prediction of Atherosclerotic Plaque Development in an In Vivo Coronary Arterial Segment Based on a Multilevel Modeling Approach. IEEE Trans Biomed Eng 2016; 64:1721-1730. [PMID: 28113248 DOI: 10.1109/tbme.2016.2619489] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE The aim of this study is to explore major mechanisms of atherosclerotic plaque growth, presenting a proof-of-concept numerical model. METHODS To this aim, a human reconstructed left circumflex coronary artery is utilized for a multilevel modeling approach. More specifically, the first level consists of the modeling of blood flow and endothelial shear stress (ESS) computation. The second level includes the modeling of low-density lipoprotein (LDL) and high-density lipoprotein and monocytes transport through the endothelial membrane to vessel wall. The third level comprises of the modeling of LDL oxidation, macrophages differentiation, and foam cells formation. All modeling levels integrate experimental findings to describe the major mechanisms that occur in the arterial physiology. In order to validate the proposed approach, we utilize a patient specific scenario by comparing the baseline computational results with the changes in arterial wall thickness, lumen diameter, and plaque components using follow-up data. RESULTS The results of this model show that ESS and LDL concentration have a good correlation with the changes in plaque area [R2 = 0.365 (P = 0.029, adjusted R2 = 0.307) and R2 = 0.368 (P = 0.015, adjusted R2 = 0.342), respectively], whereas the introduction of the variables of oxidized LDL, macrophages, and foam cells as independent predictors improves the accuracy in predicting regions potential for atherosclerotic plaque development [R2 = 0.847 (P = 0.009, adjusted R2 = 0.738)]. CONCLUSION Advanced computational models can be used to increase the accuracy to predict regions which are prone to plaque development. SIGNIFICANCE Atherosclerosis is one of leading causes of death worldwide. For this purpose computational models have to be implemented to predict disease progression.
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10
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Abstract
PURPOSE OF REVIEW Studies have shown that chronic inflammatory disorders, such as rheumatoid arthritis, systemic lupus erythematosus, and psoriasis are associated with an increased risk of atherosclerotic cardiovascular disease. The mechanism by which inflammation increases cardiovascular disease is likely multifactorial but changes in HDL structure and function that occur during inflammation could play a role. RECENT FINDINGS HDL levels decrease with inflammation and there are marked changes in HDL-associated proteins. Serum amyloid A markedly increases whereas apolipoprotein A-I, lecithin:cholesterol acyltransferase, cholesterol ester transfer protein, paraoxonase 1, and apolipoprotein M decrease. The exact mechanism by which inflammation decreases HDL levels is not defined but decreases in apolipoprotein A-I production, increases in serum amyloid A, increases in endothelial lipase and secretory phospholipase A2 activity, and decreases in lecithin:cholesterol acyltransferase activity could all contribute. The changes in HDL induced by inflammation reduce the ability of HDL to participate in reverse cholesterol transport and protect LDL from oxidation. SUMMARY During inflammation multiple changes in HDL structure occur leading to alterations in HDL function. In the short term, these changes may be beneficial resulting in an increase in cholesterol in peripheral cells to improve host defense and repair but over the long term these changes may increase the risk of atherosclerosis.
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Affiliation(s)
- Kenneth R Feingold
- Metabolism Section, Department of Veterans Affairs Medical Center, University of California San Francisco, San Francisco, California, USA
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11
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Impaired HDL cholesterol efflux in metabolic syndrome is unrelated to glucose tolerance status: the CODAM study. Sci Rep 2016; 6:27367. [PMID: 27270665 PMCID: PMC4897620 DOI: 10.1038/srep27367] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 05/13/2016] [Indexed: 12/27/2022] Open
Abstract
Type 2 diabetes mellitus (T2DM) and metabolic syndrome (MetS) increase atherosclerotic cardiovascular disease risk. Cholesterol efflux capacity (CEC) is a key metric of the anti-atherosclerotic functionality of high-density lipoproteins (HDL). The present study aimed to delineate if T2DM and MetS cross-sectionally associate with altered CEC in a large high cardiometabolic risk population. CEC was determined from THP-1 macrophage foam cells towards apolipoprotein B-depleted plasma from 552 subjects of the CODAM cohort (288 controls, 126 impaired glucose metabolism [IGM], 138 T2DM). MetS was present in 297 participants. CEC was not different between different glucose tolerance categories but was lower in MetS (P < 0.001), at least partly attributable to lower HDL cholesterol (HDL-C) and apoA-I levels (P < 0.001 for each). Low grade inflammation was increased in IGM, T2DM and MetS as determined by a score comprising 8 different biomarkers (P < 0.05-< 0.001; n = 547). CEC inversely associated with low-grade inflammation taking account of HDL-C or apoA-I in MetS (P < 0.02), but not in subjects without MetS (interaction: P = 0.015). This study demonstrates that IGM and T2DM do not impact the HDL CEC function, while efflux is lower in MetS, partly dependent on plasma HDL-C levels. Enhanced low-grade inflammation in MetS may conceivably impair CEC even independent of HDL-C and apoA-I.
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12
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Godzien J, Ciborowski M, Armitage EG, Jorge I, Camafeita E, Burillo E, Martín-Ventura JL, Rupérez FJ, Vázquez J, Barbas C. A Single In-Vial Dual Extraction Strategy for the Simultaneous Lipidomics and Proteomics Analysis of HDL and LDL Fractions. J Proteome Res 2016; 15:1762-75. [DOI: 10.1021/acs.jproteome.5b00898] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joanna Godzien
- CEMBIO,
Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid 28003, Spain
| | - Michal Ciborowski
- Clinical
Research Centre, Medical University of Bialystok, Bialystok 12-089, Poland
| | - Emily Grace Armitage
- CEMBIO,
Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid 28003, Spain
| | - Inmaculada Jorge
- Cardiovascular
Proteomics Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain
| | - Emilio Camafeita
- Cardiovascular
Proteomics Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain
| | - Elena Burillo
- Vascular
Research Laboratory, IIS-Fundación Jiménez Díaz-Autonoma University, 28040 Madrid, Spain
| | - Jose Luis Martín-Ventura
- Vascular
Research Laboratory, IIS-Fundación Jiménez Díaz-Autonoma University, 28040 Madrid, Spain
| | - Francisco J. Rupérez
- CEMBIO,
Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid 28003, Spain
| | - Jesús Vázquez
- Cardiovascular
Proteomics Laboratory, Centro Nacional de Investigaciones Cardiovasculares Carlos III (CNIC), 28029 Madrid, Spain
| | - Coral Barbas
- CEMBIO,
Centre for Metabolomics and Bioanalysis, San Pablo CEU University, Madrid 28003, Spain
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13
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Meroño T, Dauteuille C, Tetzlaff W, Martín M, Botta E, Lhomme M, Saez MS, Sorroche P, Boero L, Arbelbide J, Chapman MJ, Kontush A, Brites F. Oxidative stress, HDL functionality and effects of intravenous iron administration in women with iron deficiency anemia. Clin Nutr 2016; 36:552-558. [PMID: 26926576 DOI: 10.1016/j.clnu.2016.02.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 01/28/2016] [Accepted: 02/05/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIMS Iron deficiency anemia (IDA) affects around 20-30% of adults worldwide. An association between IDA and cardiovascular disease (CVD) has been reported. Oxidative stress, inflammation and low concentration of high-density lipoproteins (HDL) were implicated on endothelial dysfunction and CVD in IDA. We studied the effects of iron deficiency and of an intravenous iron administration on oxidative stress and HDL characteristics in IDA women. METHODS Two studies in IDA women are presented: a case-control study, including 18 patients and 18 age-matched healthy women, and a follow-up study 72hr after the administration of intravenous iron (n = 16). Lipids, malondialdehyde, cholesteryl ester transfer protein (CETP), paraoxonase-1 (PON-1) and HDL chemical composition and functionality (cholesterol efflux and antioxidative activity) were measured. Cell cholesterol efflux from iron-deficient macrophages to a reference HDL was also evaluated. RESULTS IDA patients showed higher triglycerides and CETP activity and lower HDL-C than controls (all p < 0.001). HDL particles from IDA patients showed higher triglyceride content (+30%,p < 0.05) and lower antioxidative capacity (-23%,p < 0.05). Although HDL-mediated cholesterol efflux was similar between the patients and controls, iron deficiency provoked a significant reduction in macrophage cholesterol efflux (-25%,p < 0.05). Arylesterase activity of PON-1 was significantly lower in IDA patients than controls (-16%,p < 0.05). The intravenous administration of iron was associated with a decrease in malondialdehyde levels and an increase in arylesterase activity of PON-1 (-22% and +18%, respectively, p < 0.05). CONCLUSION IDA is associated with oxidative stress and functionally deficient HDL particles. It remains to be determined if such alterations suffice to impair endothelial function in IDA.
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Affiliation(s)
- Tomás Meroño
- Laboratory of Lipids and Atherosclerosis, School of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, CONICET, Buenos Aires, Argentina.
| | - Carolane Dauteuille
- National Institute for Health and Medical Research (INSERM), UMR ICAN 1166, University of Pierre et Marie Curie - Paris 6, AP-HP, Groupe Hospitalier Pitié-Salpétrière, Paris, F-75013, France
| | - Walter Tetzlaff
- Laboratory of Lipids and Atherosclerosis, School of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, CONICET, Buenos Aires, Argentina
| | - Maximiliano Martín
- Laboratory of Lipids and Atherosclerosis, School of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, CONICET, Buenos Aires, Argentina
| | - Eliana Botta
- Laboratory of Lipids and Atherosclerosis, School of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, CONICET, Buenos Aires, Argentina
| | - Marie Lhomme
- National Institute for Health and Medical Research (INSERM), UMR ICAN 1166, University of Pierre et Marie Curie - Paris 6, AP-HP, Groupe Hospitalier Pitié-Salpétrière, Paris, F-75013, France
| | - María Soledad Saez
- Central Laboratory, Italian Hospital of Buenos Aires, Buenos Aires, Argentina
| | - Patricia Sorroche
- Central Laboratory, Italian Hospital of Buenos Aires, Buenos Aires, Argentina
| | - Laura Boero
- Laboratory of Lipids and Atherosclerosis, School of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, CONICET, Buenos Aires, Argentina
| | - Jorge Arbelbide
- Hematology Division, Italian Hospital of Buenos Aires, Buenos Aires, Argentina
| | - M John Chapman
- National Institute for Health and Medical Research (INSERM), UMR ICAN 1166, University of Pierre et Marie Curie - Paris 6, AP-HP, Groupe Hospitalier Pitié-Salpétrière, Paris, F-75013, France
| | - Anatol Kontush
- National Institute for Health and Medical Research (INSERM), UMR ICAN 1166, University of Pierre et Marie Curie - Paris 6, AP-HP, Groupe Hospitalier Pitié-Salpétrière, Paris, F-75013, France
| | - Fernando Brites
- Laboratory of Lipids and Atherosclerosis, School of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, CONICET, Buenos Aires, Argentina
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14
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Sakellarios AI, Bizopoulos P, Stefanou K, Athanasiou LS, Papafaklis MI, Bourantas CV, Naka KK, Michalis LK, Fotiadis DI. A proof-of-concept study for predicting the region of atherosclerotic plaque development based on plaque growth modeling in carotid arteries. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2015:6552-5. [PMID: 26737794 DOI: 10.1109/embc.2015.7319894] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In this work, we present a computational model for plaque growth utilizing magnetic resonance data of a patient's carotid artery. More specifically, we model blood flow utilizing the Navier-Stokes equations, as well as LDL and HDL transport using the convection-diffusion equation in the arterial lumen. The accumulated LDL in the arterial wall is oxidized considering the protective effect of HDL. Macrophages recruitment and foam cells formation are the final step of the proposed multi-level modeling approach of the plaque growth. The simulated results of our model are compared with the follow-up MRI findings in 12 months regarding the change to the arterial wall thickness. WSS and LDL may indicate potential regions of plaque growth (R(2)=0.35), but the contribution of foam cells formation, macrophages and oxidized LDL increased the prediction significantly (R(2)=0.75).
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15
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Han CY, Tang C, Guevara ME, Wei H, Wietecha T, Shao B, Subramanian S, Omer M, Wang S, O'Brien KD, Marcovina SM, Wight TN, Vaisar T, de Beer MC, de Beer FC, Osborne WR, Elkon KB, Chait A. Serum amyloid A impairs the antiinflammatory properties of HDL. J Clin Invest 2015; 126:266-81. [PMID: 26642365 DOI: 10.1172/jci83475] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 10/29/2015] [Indexed: 01/25/2023] Open
Abstract
HDL from healthy humans and lean mice inhibits palmitate-induced adipocyte inflammation; however, the effect of the inflammatory state on the functional properties of HDL on adipocytes is unknown. Here, we found that HDL from mice injected with AgNO3 fails to inhibit palmitate-induced inflammation and reduces cholesterol efflux from 3T3-L1 adipocytes. Moreover, HDL isolated from obese mice with moderate inflammation and humans with systemic lupus erythematosus had similar effects. Since serum amyloid A (SAA) concentrations in HDL increase with inflammation, we investigated whether elevated SAA is a causal factor in HDL dysfunction. HDL from AgNO3-injected mice lacking Saa1.1 and Saa2.1 exhibited a partial restoration of antiinflammatory and cholesterol efflux properties in adipocytes. Conversely, incorporation of SAA into HDL preparations reduced antiinflammatory properties but not to the same extent as HDL from AgNO3-injected mice. SAA-enriched HDL colocalized with cell surface-associated extracellular matrix (ECM) of adipocytes, suggesting impaired access to the plasma membrane. Enzymatic digestion of proteoglycans in the ECM restored the ability of SAA-containing HDL to inhibit palmitate-induced inflammation and cholesterol efflux. Collectively, these findings indicate that inflammation results in a loss of the antiinflammatory properties of HDL on adipocytes, which appears to partially result from the SAA component of HDL binding to cell-surface proteoglycans, thereby preventing access of HDL to the plasma membrane.
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16
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Wan Ahmad WNH, Sakri F, Mokhsin A, Rahman T, Mohd Nasir N, Abdul-Razak S, Md Yasin M, Mohd Ismail A, Ismail Z, Nawawi H. Low serum high density lipoprotein cholesterol concentration is an independent predictor for enhanced inflammation and endothelial activation. PLoS One 2015; 10:e0116867. [PMID: 25614985 PMCID: PMC4304817 DOI: 10.1371/journal.pone.0116867] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 12/15/2014] [Indexed: 01/13/2023] Open
Abstract
BACKGROUND Inflammation, endothelial activation and oxidative stress have been established as key events in the initiation and progression of atherosclerosis. High-density lipoprotein cholesterol (HDL-c) is protective against atherosclerosis and coronary heart disease, but its association with inflammation, endothelial activation and oxidative stress is not well established. OBJECTIVES (1) To compare the concentrations of biomarkers of inflammation, endothelial activation and oxidative stress in subjects with low HDL-c compared to normal HDL-c; (2) To examine the association and correlation between HDL-c and these biomarkers and (3) To determine whether HDL-c is an independent predictor of these biomarkers. METHODS 422 subjects (mean age±SD = 43.2±11.9 years) of whom 207 had low HDL-c concentrations (HDL-c <1.0 mmol/L and <1.3 mmol/L for males and females respectively) and 215 normal controls (HDL-c ≥1.0 and ≥1.3 mmol/L for males and females respectively) were recruited in this study. The groups were matched for age, gender, ethnicity, smoking status, diabetes mellitus and hypertension. Fasting blood samples were collected for analysis of biomarkers of inflammation [high-sensitivity C-reactive protein (hsCRP) and Interleukin-6 (IL-6)], endothelial activation [soluble Vascular Cell Adhesion Molecule-1 (sVCAM-1), soluble Intercellular Adhesion Molecule-1 (sICAM-1) and E-selectin)] and oxidative stress [F2-Isoprostanes, oxidized Low Density Lipoprotein (ox-LDL) and Malondialdehyde (MDA)]. RESULTS Subjects with low HDL-c had greater concentrations of inflammation, endothelial activation and oxidative stress biomarkers compared to controls. There were negative correlations between HDL-c concentration and biomarkers of inflammation (IL-6, p = 0.02), endothelial activation (sVCAM-1 and E-selectin, p = 0.029 and 0.002, respectively), and oxidative stress (MDA and F2-isoprostane, p = 0.036 and <0.0001, respectively). Multiple linear regression analysis showed HDL-c as an independent predictor of IL-6 (p = 0.02) and sVCAM-1 (p<0.03) after correcting for various confounding factors. CONCLUSION Low serum HDL-c concentration is strongly correlated with enhanced status of inflammation, endothelial activation and oxidative stress. It is also an independent predictor for enhanced inflammation and endothelial activation, which are pivotal in the pathogenesis of atherosclerosis and atherosclerosis-related complications.
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Affiliation(s)
- Wan Nor Hanis Wan Ahmad
- Centre for Pathology Diagnostic and Research Laboratories (CPDRL), UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Farah Sakri
- Centre for Pathology Diagnostic and Research Laboratories (CPDRL), UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Atiqah Mokhsin
- Centre for Pathology Diagnostic and Research Laboratories (CPDRL), UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Thuhairah Rahman
- Centre for Pathology Diagnostic and Research Laboratories (CPDRL), UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
- Cluster for Pathology and Laboratory Medicine, UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Nadzimah Mohd Nasir
- Centre for Pathology Diagnostic and Research Laboratories (CPDRL), UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
- Cluster for Pathology and Laboratory Medicine, UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Suraya Abdul-Razak
- Primary Care Medicine Discipline, UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Mazapuspavina Md Yasin
- Primary Care Medicine Discipline, UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Aletza Mohd Ismail
- Centre for Pathology Diagnostic and Research Laboratories (CPDRL), UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
- Cluster for Pathology and Laboratory Medicine, UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Zaliha Ismail
- Discipline of Population Health and Preventive Medicine, Faculty of Medicine, UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
| | - Hapizah Nawawi
- Centre for Pathology Diagnostic and Research Laboratories (CPDRL), UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
- Cluster for Pathology and Laboratory Medicine, UniversitiTeknologi MARA (UiTM), Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
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17
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Kalantari S, Nafar M, Rutishauser D, Samavat S, Rezaei-Tavirani M, Yang H, Zubarev RA. Predictive urinary biomarkers for steroid-resistant and steroid-sensitive focal segmental glomerulosclerosis using high resolution mass spectrometry and multivariate statistical analysis. BMC Nephrol 2014; 15:141. [PMID: 25182141 PMCID: PMC4236676 DOI: 10.1186/1471-2369-15-141] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 08/26/2014] [Indexed: 01/10/2023] Open
Abstract
Background Focal segmental glomerulosclerosis (FSGS) is a glomerular scarring disease diagnosed mostly by kidney biopsy. Since there is currently no diagnostic test that can accurately predict steroid responsiveness in FSGS, prediction of the responsiveness of patients to steroid therapy with noninvasive means has become a critical issue. In the present study urinary proteomics was used as a noninvasive tool to discover potential predictive biomarkers. Methods Urinary proteome of 10 patients (n = 6 steroid-sensitive, n = 4 steroid-resistant) with biopsy proven FSGS was analyzed using nano-LC-MS/MS and supervised multivariate statistical analysis was performed. Results Twenty one proteins were identified as discriminating species among which apolipoprotein A-1 and Matrix-remodeling protein 8 had the most drastic fold changes being over- and underrepresented, respectively, in steroid sensitive compared to steroid resistant urine samples. Gene ontology enrichment analysis revealed acute inflammatory response as the dominant biological process. Conclusion The obtained results suggest a panel of predictive biomarkers for FSGS. Proteins involved in the inflammatory response are shown to be implicated in the responsiveness. As a tool for biomarker discovery, urinary proteomics is especially fruitful in the area of prediction of responsiveness to drugs. Further validation of these biomarkers is however needed.
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Affiliation(s)
| | | | | | | | | | | | - Roman A Zubarev
- Department of Medical Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden.
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18
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Andersen CJ, Fernandez ML. Dietary approaches to improving atheroprotective HDL functions. Food Funct 2014; 4:1304-13. [PMID: 23921436 DOI: 10.1039/c3fo60207a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
High-density lipoproteins (HDL) are known to protect against cardiovascular disease (CVD). In addition to facilitating reverse cholesterol transport to remove excess lipids from the body - including atherosclerotic plaques - HDL exhibits antioxidant, anti-inflammatory, vasodilatory, and antithrombotic activities. Together, these properties contribute to the overall atheroprotective nature of HDL. However, similar to many other physiological pathways, these HDL parameters are known to become dysregulated in conditions of metabolic disease. Further, research suggests these alternative HDL properties may be regulated independently of blood HDL-cholesterol (HDL-C) levels, and must therefore be considered when designing HDL-targeted therapies. To date, a number of dietary strategies have been investigated to assess the effect of dietary components on functional properties of HDL beyond HDL-C. This review will highlight the bioactive nutrients, functional foods, and dietary programs known to modulate HDL function as a means of reducing CVD.
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Affiliation(s)
- Catherine J Andersen
- Department of Nutritional Sciences, University of Connecticut, 3624 Horsebarn Road Ext., Unit 4017, Storrs, CT 06269-4017, USA
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20
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Gordon SM, Davidson WS, Urbina EM, Dolan LM, Heink A, Zang H, Lu LJ, Shah AS. The effects of type 2 diabetes on lipoprotein composition and arterial stiffness in male youth. Diabetes 2013; 62:2958-67. [PMID: 23835332 PMCID: PMC3717874 DOI: 10.2337/db12-1753] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Recent studies suggest HDL exists as numerous subpopulations with distinct protein/lipid compositions that are not reflected in the HDL cholesterol (HDL-C) number. In this study, we sought to evaluate HDL subpopulations in adolescents with type 2 diabetes (T2D) to determine if changes in HDL composition are associated with early vascular disease. T2D (n = 10), lean (n = 9), and obese (n = 11) youth were recruited. Plasma was fractionated using gel-filtration chromatography, and lipid-associated proteins were identified using mass spectrometry. Concurrently, vascular stiffness was assessed using pulse wave velocity (PWV). We found youth with T2D exhibited decreased phospholipid content in fractions containing large HDL particles that was inversely associated with PWV (P < 0.001). No association was noted between HDL-C and PWV. Proteomic analysis revealed changes in 7 of 45 identified proteins in the T2D group, including apolipoprotein (apo) A-II, apoE, and paraoxonase-1 (P < 0.05). Our data demonstrate early changes in the lipid and protein compositions of specific HDL subspecies in adolescents with T2D that are related to early markers of arterial disease. These findings suggest that analyzing the composition of HDL, rather than HDL-C, may be useful in assessing cardiovascular risk in this population.
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Affiliation(s)
- Scott M. Gordon
- Department of Pathology, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - W. Sean Davidson
- Department of Pathology, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Elaine M. Urbina
- Division of Cardiology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Lawrence M. Dolan
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Anna Heink
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Huaiyu Zang
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - L. Jason Lu
- Division of Biomedical Informatics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
| | - Amy S. Shah
- Division of Endocrinology, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio
- Corresponding author: Amy S. Shah,
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21
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Delta-6-desaturase gene polymorphism is associated with lipoprotein oxidation in vitro. Lipids Health Dis 2013; 12:80. [PMID: 23721366 PMCID: PMC3680190 DOI: 10.1186/1476-511x-12-80] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Accepted: 05/27/2013] [Indexed: 11/10/2022] Open
Abstract
Background Oxidative modification of low-density lipoprotein (LDL) is a key event in the oxidation hypothesis of atherogenesis. We have previously shown that HDL does not protect LDL from oxidation in vitro, but is in fact oxidized fastest of all lipoproteins due to its rich polyunsaturated fatty acid (PUFA) composition, which is oxidation promoting. Evidence has accumulated to show that in addition to diet, common polymorphisms in the fatty acid desaturase (FADS) gene cluster have very marked effects on human PUFA status. There is a deletion [T/-] in the promoter region of the Δ6 –desaturase gene (FADS2, rs 3834458), which has a direct inhibitory influence on production of PUFA from linoleic and alpha-linolenic acid. To investigate the possible role of rs 3834458 in lipoprotein modification, oxidation of LDL with HDL2 or HDL3 were analyzed from plasma of 58 free-living individuals. Results Total eicosapentaenoic acid and arachidonic acid were significantly decreased in plasma from the 10 subjects homozygous for the deletion in FADS2 rs 3834458. When the isolated LDL and HDL2 were subjected to Cu2+-induced oxidation, these subjects showed decreased rate of appearance (p = 0.027) and the final concentration of conjugated dienes (p = 0.033) compared to the other genotypes. For oxidation of LDL with HDL3, the final concentration of conjugated dienes was also significantly decreased in subjects with [−/−] compared with [T/T] and [T/-] (p = 0.034). Conclusion We conclude that FADS2 genotype may play a role in peroxidation susceptibility of lipoproteins.
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23
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Sampaio E, Barbosa DS, Mazzuco TL, Nunes VS, Passarelli M, Nakandakare ER, Carrilho AJF. Impaired antioxidant action of high density lipoprotein in patients with type 1 diabetes with normoalbuminuria and microalbuminuria. Diabetes Res Clin Pract 2013; 99:321-6. [PMID: 23394721 DOI: 10.1016/j.diabres.2012.12.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2012] [Revised: 10/24/2012] [Accepted: 12/13/2012] [Indexed: 10/27/2022]
Abstract
AIMS Patients with type 1 diabetes, in the absence of chronic complications, have serum concentrations of high density lipoprotein cholesterol (HDL-C) similar to the general population. However, their HDL particles may be dysfunctional. We aimed to evaluate the antioxidant effect of HDL2 and HDL3 obtained from Caucasian males with type 1 diabetes with normoalbuminuria and microalbuminuria. METHODS Twenty Caucasian men with type 1 diabetes (10 with normoalbuminuria and 10 with microalbuminuria) and 10 healthy Caucasian men participated in the study. Lipoproteins were obtained by density gradient ultracentrifugation. The antioxidant effect of HDL was assessed by measuring lipid hydroperoxide (LOOH) concentration after 3h of pooled LDL oxidation catalyzed by 5μM CuSO4 in the absence or presence of HDL2 or HDL3. RESULTS The control, normoalbuminuria, and microalbuminuria groups had similar HDL-C concentration and estimated glomerular filtration rate. Glycemic control was similar between diabetes groups (HbA1c 8.1±0.9% and 8.3±0.7%, P=0.70), but estimated glucose disposal rate was lower in patients with microalbuminuria (8.0±0.6 and 4.5±1.1mg/kg/min, P<0.01). The relative antioxidant effect of HDL2 from control, normoalbuminuria, and microalbuminuria groups were 92.8±2.4%, 85.4±1.7%, and 74.2±4.6%, respectively (P<0.01), and the HDL3 effect were 95.0±2.2%, 86.4±4.4%, and 75.3±4.2%, respectively (P<0.01). CONCLUSION Both HDL2 and HDL3 inhibited LOOH formation in copper-catalyzed oxidation of LDL in vitro. Overall, this antioxidant effect was lower in Caucasian men with type 1 diabetes, and was further compounded in those with microalbuminuria.
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Affiliation(s)
- Emerson Sampaio
- Postgraduate Program in Health Sciences, Universidade Estadual de Londrina, Londrina, PR, Brazil
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24
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Sakellarios AI, Siogkas PK, Athanasiou LS, Exarchos TP, Papafaklis MI, Bourantas CV, Naka KK, Michalis LK, Filipovic N, Parodi O, Fotiadis DI. Three-dimensional modeling of oxidized-LDL accumulation and HDL mass transport in a coronary artery: a proof-of-concept study for predicting the region of atherosclerotic plaque development. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2013; 2013:4513-4516. [PMID: 24110737 DOI: 10.1109/embc.2013.6610550] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Low density lipoprotein (LDL) has a significant role on the atherosclerotic plaque development, while the concentration of high density lipoproteins (HDL) is considered to play an atheroprotective role according to several biochemical mechanisms. In this work, it is the first time that both LDL and HDL concentrations are taken into account in order to predict the regions prone for plaque development. Our modeling approach is based on the use of a realistic three-dimensional reconstructed pig coronary artery in two time points. Biochemical data measured in the pig were also included in order to develop a more customized model. We modeled coronary blood flow by solving the Navier-Stokes equations in the arterial lumen and plasma filtration in the arterial wall using Darcy's Law. HDL transport was modeled only in the arterial lumen using the convection-diffusion equation, while LDL transport was modeled both in the lumen and the arterial wall. An additional novelty of this work is that we model the oxidation of LDL taking into account the atheroprotective role of HDL. The results of our model were in good agreement with histological findings demonstrating that increased oxidized LDL is found near regions of advanced plaques, while non-oxidized LDL is found in regions of early plaque types.
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Abstract
Levels of high-density lipoprotein (HDL) cholesterol are generally inversely associated with the risk for the development of atherosclerosis. The mechanism by which HDL imparts protection from the initiation and progression of occlusive vascular disease is complex and multifactorial. The major anti-atherosclerotic effect of HDL is felt to be reverse cholesterol transport. HDL has been demonstrated to scavenge cholesterol from the peripheral vasculature with transport to the liver, where is it excreted in the biliary system. However, HDL exhibits multiple other physiologic effects that may play a role in the reduced risk for atherosclerosis. HDL has been demonstrated to exhibit beneficial effects on platelet function, endothelial function, coagulation parameters, inflammation, and interactions with triglyceride-rich lipoproteins. Increasing amounts of clinical and experimental data have shown that HDL cholesterol has significant antioxidant effect that may significantly contribute to protection from atherosclerosis.
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Mangé A, Goux A, Badiou S, Patrier L, Canaud B, Maudelonde T, Cristol JP, Solassol J. HDL proteome in hemodialysis patients: a quantitative nanoflow liquid chromatography-tandem mass spectrometry approach. PLoS One 2012; 7:e34107. [PMID: 22470525 PMCID: PMC3309955 DOI: 10.1371/journal.pone.0034107] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Accepted: 02/21/2012] [Indexed: 01/14/2023] Open
Abstract
Aside from a decrease in the high-density lipoprotein (HDL) cholesterol levels, qualitative abnormalities of HDL can contribute to an increase in cardiovascular (CV) risk in end-stage renal disease (ESRD) patients undergoing chronic hemodialysis (HD). Dysfunctional HDL leads to an alteration of reverse cholesterol transport and the antioxidant and anti-inflammatory properties of HDL. In this study, a quantitative proteomics approach, based on iTRAQ labeling and nanoflow liquid chromatography mass spectrometry analysis, was used to generate detailed data on HDL-associated proteins. The HDL composition was compared between seven chronic HD patients and a pool of seven healthy controls. To confirm the proteomics results, specific biochemical assays were then performed in triplicate in the 14 samples as well as 46 sex-matched independent chronic HD patients and healthy volunteers. Of the 122 proteins identified in the HDL fraction, 40 were differentially expressed between the healthy volunteers and the HD patients. These proteins are involved in many HDL functions, including lipid metabolism, the acute inflammatory response, complement activation, the regulation of lipoprotein oxidation, and metal cation homeostasis. Among the identified proteins, apolipoprotein C-II and apolipoprotein C-III were significantly increased in the HDL fraction of HD patients whereas serotransferrin was decreased. In this study, we identified new markers of potential relevance to the pathways linked to HDL dysfunction in HD. Proteomic analysis of the HDL fraction provides an efficient method to identify new and uncharacterized candidate biomarkers of CV risk in HD patients.
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Affiliation(s)
- Alain Mangé
- CHU Arnaud de Villeneuve, Dept of Cellular Biology, Montpellier, France
- University of Montpellier I, Montpellier, France
- Val d'Aurelle Cancer Institute, Dept of Clinical Oncoproteomic, Montpellier, France
| | - Aurélie Goux
- University of Montpellier I, Montpellier, France
- UMR 204 NUTRIPASS (University of Montpellier I/II), Montpellier, France
| | - Stéphanie Badiou
- University of Montpellier I, Montpellier, France
- CHU Lapeyronie, Dept of Biochemistry, Montpellier, France
- UMR 204 NUTRIPASS (University of Montpellier I/II), Montpellier, France
| | - Laure Patrier
- University of Montpellier I, Montpellier, France
- CHU Lapeyronie, Dept of Biochemistry, Montpellier, France
- UMR 204 NUTRIPASS (University of Montpellier I/II), Montpellier, France
| | - Bernard Canaud
- University of Montpellier I, Montpellier, France
- UMR 204 NUTRIPASS (University of Montpellier I/II), Montpellier, France
- CHU Lapeyronie, Dept of Nephrology, Montpellier, France
| | - Thierry Maudelonde
- CHU Arnaud de Villeneuve, Dept of Cellular Biology, Montpellier, France
- University of Montpellier I, Montpellier, France
- Val d'Aurelle Cancer Institute, Dept of Clinical Oncoproteomic, Montpellier, France
| | - Jean-Paul Cristol
- University of Montpellier I, Montpellier, France
- CHU Lapeyronie, Dept of Biochemistry, Montpellier, France
- UMR 204 NUTRIPASS (University of Montpellier I/II), Montpellier, France
| | - Jérôme Solassol
- CHU Arnaud de Villeneuve, Dept of Cellular Biology, Montpellier, France
- University of Montpellier I, Montpellier, France
- Val d'Aurelle Cancer Institute, Dept of Clinical Oncoproteomic, Montpellier, France
- * E-mail:
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Unchern S, Laohareungpanya N, Sanvarinda Y, Pattanapanyasat K, Tanratana P, Chantharaksri U, Sibmooh N. Oxidative modification and poor protective activity of HDL on LDL oxidation in thalassemia. Lipids 2010; 45:627-33. [PMID: 20532993 DOI: 10.1007/s11745-010-3435-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Accepted: 05/15/2010] [Indexed: 10/19/2022]
Abstract
Oxidative modification of low-density lipoprotein (LDL) has been reported in thalassemia, which is a consequence of oxidative stress. However, the levels of oxidized high-density lipoprotein (HDL) in thalassemia have not been evaluated and it is unclear whether HDL oxidation may be linked to LDL oxidation. In this study, the levels of total cholesterol, iron, protein, conjugated diene (CD), lipid hydroperoxide (LOOH), and thiobarbituric acid reactive substances (TBARs) were determined in HDL from healthy volunteers and patients with beta-thalassemia intermedia with hemoglobin E (beta-thal/Hb E). The protective activity of thalassemic HDL on LDL oxidation was also investigated. The iron content of HDL(2) and HDL(3) from beta-thal/HbE patients was higher while the cholesterol content was lower than those in healthy volunteers. Thalassemic HDL(2) and HDL(3) had increased levels of lipid peroxidation markers i.e., conjugated diene, LOOH, and TBARs. Thalassemic HDL had lower peroxidase activity than control HDL and was unable to protect LDL from oxidation induced by CuSO(4). Our findings highlight the oxidative modification and poor protective activity of thalassemic HDL on LDL oxidation which may contribute to cardiovascular complications in thalassemia.
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Affiliation(s)
- Supeenun Unchern
- Department of Pharmacology, Faculty of Science, Mahidol University, Rama 6 Rd, Bangkok, 10400, Thailand
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Fujimoto VY, Kane JP, Ishida BY, Bloom MS, Browne RW. High-density lipoprotein metabolism and the human embryo. Hum Reprod Update 2010; 16:20-38. [PMID: 19700490 DOI: 10.1093/humupd/dmp029] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND High-density lipoprotein (HDL) appears to be the dominant lipoprotein particle in human follicular fluid (FF). The reported anti-atherogenic properties of HDL have been attributed in part to reverse cholesterol transport. The discoveries of the scavenger receptor class B type I (SR-BI) and the ATP-binding cassette A1 lipid (ABCA1) transporter have generated studies aimed at unraveling the pathways of HDL biogenesis, remodeling and catabolism. The production of SR-BI and ABCA1 knockout mice as well as other lipoprotein metabolism-associated mutants has resulted in reduced or absent fertility, leading us to postulate the existence of a human hepatic-ovarian HDL-associated axis of fertility. Here, we review an evolving literature on the role of HDL metabolism on mammalian fertility and oocyte development. METHODS An extensive online search was conducted of published articles relevant to the section topics discussed. All relevant English language articles contained in Pubmed/Medline, with no specific time frame for publication, were considered for this narrative review. Cardiovascular literature was highly cited due to the wealth of relevant knowledge on HDL metabolism, and the dearth thereof in the reproductive field. RESULTS Various vertebrate models demonstrate a role for HDL in embryo development and fertility. In our clinical studies, FF levels of HDL cholesterol and apolipoprotein AI levels were negatively associated with embryo fragmentation, but not with embryo cell cleavage rate. However, the HDL component, paraoxonase 1 arylesterase activity, was positively associated with embryo cell cleavage rate. CONCLUSIONS HDL contributes to intra-follicular cholesterol homeostasis which appears to be important for successful oocyte and embryo development.
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Affiliation(s)
- Victor Y Fujimoto
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of California at San Francisco, San Francisco, CA 94115-0916, USA.
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de Juan-Franco E, Pérez A, Ribas V, Sánchez-Hernández JA, Blanco-Vaca F, Ordóñez-Llanos J, Sánchez-Quesada JL. Standardization of a method to evaluate the antioxidant capacity of high-density lipoproteins. INTERNATIONAL JOURNAL OF BIOMEDICAL SCIENCE : IJBS 2009; 5:402-410. [PMID: 23675165 PMCID: PMC3614798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2009] [Accepted: 10/21/2009] [Indexed: 06/02/2023]
Abstract
BACKGROUND A method to evaluate the antioxidant capacity of high-density lipoprotein (HDL) was developed and standardized. METHODS This method measure conjugated diene (CD) formation and electrophoretic mobility of low-density lipoprotein (LDL) in agarose gels in the presence and absence of HDL. HDL was isolated from 1 mL of plasma within 24 hours and oxidation assays were performed within 6 hours. Oxidation was induced by adding CuSO4. The lag phase increase in CD kinetics and the inhibition of electrophoretic mobility were defined as the HDL antioxidant capacity. RESULTS The optimal conditions for the CD assay were 2.5 μM CuSO4, LDL at 0.1 g apoB/L, HDL at 0.1 g apoA-I/L, at 37°C and for 3h 50 min. Agarose electrophoresis at 100 V, at 4°C for 50 min was then performed immediately. CD formation variability was 21.1% for inter-assay CV and 12.7% for intra-assay CV. Electrophoretic mobility was 26.5% for inter-assay CV and 2.4% for intra-assay CV. Correlation analysis showed a significant association between the antioxidant capacity of HDL and its neutral/polar lipid ratio. CONCLUSIONS The method herein described measures of the HDL antioxidant capacity in a reproducible and rapid manner that can be applied to a relatively high number of samples.
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Affiliation(s)
- Elena de Juan-Franco
- Department of Biochemistry, Institut de Recerca, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | - Antonio Pérez
- Department of Endocrinology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas CIBERDEM
| | - Vicent Ribas
- Department of Biochemistry, Institut de Recerca, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
| | | | - Francisco Blanco-Vaca
- Department of Biochemistry, Institut de Recerca, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
- CIBER de Diabetes y Enfermedades Metabólicas Asociadas CIBERDEM
- Department of Biochemistry and Molecular Biology, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Jordi Ordóñez-Llanos
- Department of Biochemistry, Institut de Recerca, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
- Department of Biochemistry and Molecular Biology, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - José Luis Sánchez-Quesada
- Department of Biochemistry, Institut de Recerca, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
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Nguyen SD, Sok DE. Effect of 3,4-dihydroxyphenylalanine on Cu2+-induced Inactivation of HDL-associated Paraoxonase1 and Oxidation of HDL; Inactivation of Paraoxonase1 Activity Independent of HDL Lipid Oxidation. Free Radic Res 2009; 38:969-76. [PMID: 15621715 DOI: 10.1080/10715760400000943] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Paraoxonasel (PON1), one of HDL-asssociated antioxidant proteins, is known to be sensitive to oxidative stress. Here, the effect of endogenous reducing compounds on Cu(2+)-mediated inactivation of PON1 was examined. Cu(2+)-mediated inactivation of PON1 was enhanced remarkably by catecholamines, but not by uric acid or homocysteine. Furthermore, catecholamines such as 3,4-dihydroxyphenylalanine (DOPA), dopamine or norepinephrine were more effective than caffeic acid or pyrocatechol in promoting Cu(2+)-mediated inactivation of PON1, suggesting the importance of dihydroxybenzene group as well as amino group. DOPA at relatively low concentrations showed a concentration-dependent inactivation of PON1 in a concert with Cu2+, but not Fe2+. The DOPA/Cu(2+)-induced inactivation of PON1 was prevented by catalase, but not hydroxyl radical scavengers, consistent with Cu(2+)-catalyzed oxidation. A similar result was also observed when HDL-associated PON1 (HDL-PON1) was exposed to DOPA/Cu2+. Separately, it was found that DOPA at low concentrations (1-6 microM) acted as a pro-oxidant by enhancing Cu(2+)-induced oxidation of HDL, while it exhibited an antioxidant action at > or = 10 microM. In addition, Cu(2+)-oxidized HDL lost the antioxidant action against LDL oxidation. Meanwhile, the role of DOPA/Cu(2+)-oxidized HDL differed according to DOPA concentration; HDL oxidized with Cu2+ in the presence of DOPA (60 or 120 microM) maintained antioxidant activity of native HDL, in contrast to an adverse effect of DOPA at 3 or 6 microM. These data indicate that DOPA at micromolar level may act as a pro-oxidant in Cu(2+)-induced inactivation of PON1 as well as oxidation of HDL. Also, it is proposed that the oxidative inactivation of HDL-PON1 is independent of HDL oxidation.
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Affiliation(s)
- Su Duy Nguyen
- College of Pharmacy, Chungnam National University, Yuseong-Ku, Taejon 305-764, South Korea
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Ortiz-Muñoz G, Houard X, Martín-Ventura JL, Ishida BY, Loyau S, Rossignol P, Moreno JA, Kane JP, Chalkley RJ, Burlingame AL, Michel JB, Meilhac O. HDL antielastase activity prevents smooth muscle cell anoikis, a potential new antiatherogenic property. FASEB J 2009; 23:3129-39. [PMID: 19417089 DOI: 10.1096/fj.08-127928] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Various studies using proteomic approaches have shown that HDL can carry many proteins other than its constitutive apolipoprotein A-I (apoA-I). Using mass spectrometry and Western blotting, we showed the presence of alpha(1)-antitrypsin (AAT) (SERPINA1, serpin peptidase inhibitor, clade A, an elastase inhibitor) in HDL, isolated either by ultracentrifugation or by selected-affinity immunosorption using an anti-apoA-I column. Furthermore, we report that HDL possesses potent antielastase activity. We further showed that only HDL but not LDL is able to bind AAT. HDL-associated AAT was able to inhibit extracellular matrix degradation, cell detachment, and apoptosis induced by elastase in human vascular smooth muscle cells (VSMCs) and in mammary artery cultured ex vivo. Degradation of fibronectin by elastase used as a marker of pericellular proteolysis was prevented by addition of HDL. Elastase present in aortic abdominal aneurysm (AAA) thrombus samples was also able to induce apoptosis of VSMCs in culture. This phenomenon was prevented by addition of HDL but not of LDL. Finally, we report that the proportion of AAT in HDL isolated from patients with an AAA is decreased relative to that from matched control subjects, suggesting a reduced capacity of HDL to inhibit elastase in these patients. In conclusion, our data provide evidence of a new potential antiatherogenic property of HDL attributable to AAT and its antielastase activity.
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Beyond high-density lipoprotein cholesterol levels evaluating high-density lipoprotein function as influenced by novel therapeutic approaches. J Am Coll Cardiol 2008; 51:2199-211. [PMID: 18534265 DOI: 10.1016/j.jacc.2008.03.016] [Citation(s) in RCA: 208] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2007] [Revised: 02/19/2008] [Accepted: 03/04/2008] [Indexed: 02/02/2023]
Abstract
A number of therapeutic strategies targeting high-density lipoprotein (HDL) cholesterol and reverse cholesterol transport are being developed to halt the progression of atherosclerosis or even induce regression. However, circulating HDL cholesterol levels alone represent an inadequate measure of therapeutic efficacy. Evaluation of the potential effects of HDL-targeted interventions on atherosclerosis requires reliable assays of HDL function and surrogate markers of efficacy. Promotion of macrophage cholesterol efflux and reverse cholesterol transport is thought to be one of the most important mechanisms by which HDL protects against atherosclerosis, and methods to assess this pathway in vivo are being developed. Indexes of monocyte chemotaxis, endothelial inflammation, oxidation, nitric oxide production, and thrombosis reveal other dimensions of HDL functionality. Robust, reproducible assays that can be performed widely are needed to move this field forward and permit effective assessment of the therapeutic potential of HDL-targeted therapies.
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Abstract
AbstractThe CuZn superoxide dismutase (SOD1), a member of a group of isoenzymes involved in the scavenger of superoxide anions, is a dimeric carbohydrate free protein, mainly localized in the cytosol. The reactive oxygen species (ROS) are involved in many pathophysiological events correlated with mutagenesis, cancer, degenerative processes and aging. In the first part of this mini-review the well known role of SOD1 and ROS are briefly summarized. Following, a potential novel biological action that SOD1 could exert is described, based on the recent researches demonstrating the secretion of this enzyme in many cellular lines. Moreover, the role of impaired mutant SOD1 secretion, associated with cytoplasmic toxic inclusion, which occurs in familial amyotrophic lateral sclerosis (ALS), is summarized. In addition, a depolarization-dependent release of SOD1 in pituitary GH3 cells and in rat synaptosomes through a calcium and SNARE-dependent mechanism is reported.
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Davidson MH, Smith J, Scott R, Small R, Choi J, Ishida BY, Kane JP. Assessment of lipoprotein profiles study (ALPS) and antioxidant activity in healthy subjects treated with AGI-1067. J Clin Lipidol 2007; 1:271-9. [PMID: 21291691 DOI: 10.1016/j.jacl.2007.07.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Revised: 06/16/2007] [Accepted: 07/16/2007] [Indexed: 11/30/2022]
Abstract
BACKGROUND AGI-1067 (succinobucol) is a phenolic derivative of probucol that inhibits the vascular oxidative-inflammatory cascade and is intended to have an improved clinical profile. OBJECTIVE The Assessment of Lipoprotein Profiles (ALPS) study evaluated the effects of AGI-1067 on lipid, antioxidant, antiinflammatory and safety profiles in healthy subjects. METHODS This was a double-blind, placebo-controlled, 12-week, multicenter trial. Eligible subjects, aged 18 to 65 years, had low-density lipoprotein cholesterol (LDL-C) ≤ 190 mg/dL, triglyceride (TG) ≤ 600 mg/dL and Framingham risk <10%. Subjects were randomized 1:1 to oral 300 mg AGI-1067 (n = 127) or matching placebo (n = 127) once daily. RESULTS AGI-1067 and placebo treatment had small changes (mean) in: LDL-C (+2.98 vs -1.52 mg/dL, respectively; P = 0.057), apolipoprotein B (+1.48 vs -1.91 mg/dL; P = 0.267), high-density lipoprotein cholesterol (HDL-C) [-3.69 vs -0.29 mg/dL; P < 0.001], and apolipoprotein (Apo) A-I (-10.43 vs -6.14 mg/dL; P = 0.021). Subjects with baseline LDL-C > 130 mg/dL showed the largest decreases in HDL-C and ApoA-I, while subjects with LDL-C ≤130 mg/dL had insignificant changes in both parameters. Changes in cholesteryl ester transfer protein mass were significantly correlated (P < 0.0001) with LDL-C changes, but not HDL-C. Paraoxonase activity increased with AGI-1067 vs little change in placebo (+1.78 vs +0.15 U/L, respectively; P = 0.077). HDL particles isolated from AGI-1067 treated subjects showed significant antioxidant potency vs HDL particles from placebo subjects (thiobarbituric acid reactive substances in a LDL oxidation assay decreased -25.88% vs +7.88, respectively; P = 0.011). CONCLUSION The ALPS study demonstrated that AGI-1067 had minor effects on LDL and HDL cholesterol. More dramatic effects were observed for HDL-associated paraoxonase and thiobarbituric acid reactive substances activity, suggesting that the antiatherosclerotic properties of AGI-1067 may involve an HDL antioxidant mechanism consistent with inhibition of the oxidative-inflammatory cascade, rather than involving a lipid regulating pathway.
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Affiliation(s)
- Michael H Davidson
- Section of Preventive Medicine, Department of Cardiology, Rush University College of Medicine, Chicago, IL, USA; Radiant Research, 515 North Street, Chicago, IL 60610, USA
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35
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Vaisar T, Pennathur S, Green PS, Gharib SA, Hoofnagle AN, Cheung MC, Byun J, Vuletic S, Kassim S, Singh P, Chea H, Knopp RH, Brunzell J, Geary R, Chait A, Zhao XQ, Elkon K, Marcovina S, Ridker P, Oram JF, Heinecke JW. Shotgun proteomics implicates protease inhibition and complement activation in the antiinflammatory properties of HDL. J Clin Invest 2007; 117:746-56. [PMID: 17332893 PMCID: PMC1804352 DOI: 10.1172/jci26206] [Citation(s) in RCA: 719] [Impact Index Per Article: 42.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2005] [Accepted: 12/22/2006] [Indexed: 01/12/2023] Open
Abstract
HDL lowers the risk for atherosclerotic cardiovascular disease by promoting cholesterol efflux from macrophage foam cells. However, other antiatherosclerotic properties of HDL are poorly understood. To test the hypothesis that the lipoprotein carries proteins that might have novel cardioprotective activities, we used shotgun proteomics to investigate the composition of HDL isolated from healthy subjects and subjects with coronary artery disease (CAD). Unexpectedly, our analytical strategy identified multiple complement-regulatory proteins and a diverse array of distinct serpins with serine-type endopeptidase inhibitor activity. Many acute-phase response proteins were also detected, supporting the proposal that HDL is of central importance in inflammation. Mass spectrometry and biochemical analyses demonstrated that HDL3 from subjects with CAD was selectively enriched in apoE, raising the possibility that HDL carries a unique cargo of proteins in humans with clinically significant cardiovascular disease. Collectively, our observations suggest that HDL plays previously unsuspected roles in regulating the complement system and protecting tissue from proteolysis and that the protein cargo of HDL contributes to its antiinflammatory and antiatherogenic properties.
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Affiliation(s)
- Tomas Vaisar
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Subramaniam Pennathur
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Pattie S. Green
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Sina A. Gharib
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Andrew N. Hoofnagle
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Marian C. Cheung
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Jaeman Byun
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Simona Vuletic
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Sean Kassim
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Pragya Singh
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Helen Chea
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Robert H. Knopp
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - John Brunzell
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Randolph Geary
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Alan Chait
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Xue-Qiao Zhao
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Keith Elkon
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Santica Marcovina
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Paul Ridker
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - John F. Oram
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
| | - Jay W. Heinecke
- Department of Medicine and
Department of Laboratory Medicine, University of Washington School of Medicine, Seattle, Washington, USA.
Division of Surgical Sciences, Wake Forest University School of Medicine, Winston-Salem, North Carolina, USA.
Department of Medicine, Harvard Medical School, Boston, Massachusetts, USA
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Hansel B, Kontush A, Bonnefont-Rousselot D, Bruckert E, Chapman MJ. Alterations in lipoprotein defense against oxidative stress in metabolic syndrome. Curr Atheroscler Rep 2007; 8:501-9. [PMID: 17045077 DOI: 10.1007/s11883-006-0026-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Metabolic syndrome (MetS) is a high-risk condition for premature atherosclerotic vascular disease. Patients with MetS display a lipoprotein profile in which dense low-density lipoproteins (LDL), which are more susceptible to oxidation, predominate. Oxidation of lipoproteins can be attenuated in vivo by enzymatic and nonenzymatic antioxidant defenses, but high-density lipoproteins (HDL) play a key role in the protection of LDL from oxidation. Such activity depends on the presence of apolipoproteins (apoA-I, apoA-II, apoA-IV, apoE) and enzymes (paraoxonase 1, platelet activating factor-acetylhydrolase, lecithin:cholesterol acyltransferase, glutathione peroxidase). The impairment of HDL antioxidative activity in MetS is partly related to an enrichment of small HDL in triglycerides and their depletion in cholesteryl esters, to the replacement of apoA-I by serum amyloid A, and to glycation and oxidation of apoA-I. Therapeutic normalization of the quantity and the quality of HDL particles may constitute a novel approach to attenuate atherosclerosis and cardiovascular risk in MetS.
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Affiliation(s)
- Boris Hansel
- Service d'Endocrinologie-Métabolisme, Pavillon Benjamin Delessert, Hôpital de la Pitié, 83 Boulevard de l'Hôpital, 75651 Paris Cedex 13, France.
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McPherson PAC, Young IS, McKibben B, McEneny J. High density lipoprotein subfractions: isolation, composition, and their duplicitous role in oxidation. J Lipid Res 2007; 48:86-95. [PMID: 17065664 DOI: 10.1194/jlr.m600094-jlr200] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The plasma HDLs represent a major class of cholesterol-transporting lipoprotein that can be divided into two distinct subfractions, HDL(2) and HDL(3), by ultracentrifugation. Existing methods for the subfractionation of HDL requires lengthy ultracentrifugations, making them unappealing for large-scale studies. We describe a method that subfractionates HDL from plasma in only 6 h, representing a substantial decrease in total isolation time. The subfractions so isolated were assessed for a variety of lipid and protein components, in addition to their susceptibility to oxidation, both alone and in combination with VLDL and LDL. We report for the first time a prooxidant role for HDL during VLDL oxidation, in which HDL donates preformed hydroperoxides to VLDL in a cholesteryl ester transfer protein (CETP)-dependent process. Examination of the participation of HDL in LDL oxidation has reinforced its classic role as a potent antioxidant. Furthermore, we have also implicated the second major HDL-associated enzyme, LCAT, in these processes, whereby it acts as a potent prooxidant during VLDL oxidation but as an antioxidant during LDL oxidation. Thus, we have identified a potentially duplicitous role for HDL in the pathogenesis of atherosclerosis, attributable to both CETP and LCAT.
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Affiliation(s)
- Peter A C McPherson
- Centre for Clinical and Population Sciences, Nutrition and Metabolism Group, Queen's University, Belfast, United Kingdom
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38
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Corzett TH, Fodor IK, Choi MW, Walsworth VL, Chromy BA, Turteltaub KW, McCutchen-Maloney SL. Statistical analysis of the experimental variation in the proteomic characterization of human plasma by two-dimensional difference gel electrophoresis. J Proteome Res 2006; 5:2611-9. [PMID: 17022632 DOI: 10.1021/pr060100p] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The complexity of human plasma presents a number of challenges to the efficient and reproducible proteomic analysis of differential expression in response to disease. Before individual variation and disease-specific protein biomarkers can be identified from human plasma, the experimental variability inherent in the protein separation and detection techniques must be quantified. We report on the variation found in two-dimensional difference gel electrophoresis (2-D DIGE) analysis of human plasma. Eight aliquots of a human plasma sample were subjected to top-6 highest abundant protein depletion and were subsequently analyzed in triplicate for a total of 24 DIGE samples on 12 gels. Spot-wise standard deviation estimates indicated that fold changes greater than 2 can be detected with a manageable number of replicates in simple ANOVA experiments with human plasma. Mixed-effects statistical modeling quantified the effect of the dyes, and segregated the spot-wise variance into components of sample preparation, gel-to-gel differences, and random error. The gel-to-gel component was found to be the largest source of variation, followed by the sample preparation step. An improved protocol for the depletion of the top-6 high-abundance proteins is suggested, which, along with the use of statistical modeling and future improvements in gel quality and image processing, can further reduce the variation and increase the efficiency of 2-D DIGE proteomic analysis of human plasma.
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Affiliation(s)
- Todd H Corzett
- Biosciences Directorate, Lawrence Livermore National Laboratory, 7000 East Avenue, L-452, Livermore, California 94550, USA
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39
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Kontush A, Chapman MJ. Functionally defective high-density lipoprotein: a new therapeutic target at the crossroads of dyslipidemia, inflammation, and atherosclerosis. Pharmacol Rev 2006; 58:342-74. [PMID: 16968945 DOI: 10.1124/pr.58.3.1] [Citation(s) in RCA: 533] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
High-density lipoproteins (HDL) possess key atheroprotective biological properties, including cellular cholesterol efflux capacity, and anti-oxidative and anti-inflammatory activities. Plasma HDL particles are highly heterogeneous in physicochemical properties, metabolism, and biological activity. Within the circulating HDL particle population, small, dense HDL particles display elevated cellular cholesterol efflux capacity, afford potent protection of atherogenic low-density lipoprotein against oxidative stress and attenuate inflammation. The antiatherogenic properties of HDL can, however be compromised in metabolic diseases associated with accelerated atherosclerosis. Indeed, metabolic syndrome and type 2 diabetes are characterized not only by elevated cardiovascular risk and by low HDL-cholesterol (HDL-C) levels but also by defective HDL function. Functional HDL deficiency is intimately associated with alterations in intravascular HDL metabolism and structure. Indeed, formation of HDL particles with attenuated antiatherogenic activity is mechanistically related to core lipid enrichment in triglycerides and cholesteryl ester depletion, altered apolipoprotein A-I (apoA-I) conformation, replacement of apoA-I by serum amyloid A, and covalent modification of HDL protein components by oxidation and glycation. Deficient HDL function and subnormal HDL-C levels may act synergistically to accelerate atherosclerosis in metabolic disease. Therapeutic normalization of attenuated antiatherogenic HDL function in terms of both particle number and quality of HDL particles is the target of innovative pharmacological approaches to HDL raising, including inhibition of cholesteryl ester transfer protein, enhanced lipidation of apoA-I with nicotinic acid and infusion of reconstituted HDL or apoA-I mimetics. A preferential increase in circulating concentrations of HDL particles possessing normalized antiatherogenic activity is therefore a promising therapeutic strategy for the treatment of common metabolic diseases featuring dyslipidemia, inflammation, and premature atherosclerosis.
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Affiliation(s)
- Anatol Kontush
- Dyslipoproteinemia and Atherosclerosis Research Unit, National Institute for Health and Medical Research, Hôpital de la Pitié, 83 boulevard de l'Hôpital, 75651 Paris Cedex 13, France.
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40
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Bellosta S, Gomaraschi M, Canavesi M, Rossoni G, Monetti M, Franceschini G, Calabresi L. Inhibition of MMP-2 activation and release as a novel mechanism for HDL-induced cardioprotection. FEBS Lett 2006; 580:5974-8. [PMID: 17052715 DOI: 10.1016/j.febslet.2006.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2006] [Accepted: 10/03/2006] [Indexed: 11/19/2022]
Abstract
High density lipoproteins (HDL) protect the heart against ischemia/reperfusion (I/R) injury, and matrix metalloproteinase-2 (MMP-2) directly contributes to cardiac contractile dysfunction after I/R. To investigate the possible involvement of MMP-2 inhibition in HDL-mediated cardioprotection, isolated rat hearts underwent 20 min of low-flow ischemia and 30 min of reperfusion. Plasma-derived and synthetic HDL attenuated the I/R-induced cardiac MMP-2 activation and release in a dose-dependent way. The attenuation of I/R-induced MMP-2 activation by HDL correlated with the reduction of post-ischemic contractile dysfunction and cardiomyocyte necrosis. These results indicate prevention of MMP-2 activation as a novel mechanism for HDL-mediated cardioprotection.
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Affiliation(s)
- Stefano Bellosta
- Department of Pharmacological Sciences, University of Milano, Italy
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41
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Negre-Salvayre A, Dousset N, Ferretti G, Bacchetti T, Curatola G, Salvayre R. Antioxidant and cytoprotective properties of high-density lipoproteins in vascular cells. Free Radic Biol Med 2006; 41:1031-40. [PMID: 16962927 DOI: 10.1016/j.freeradbiomed.2006.07.006] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2006] [Revised: 07/03/2006] [Accepted: 07/05/2006] [Indexed: 11/26/2022]
Abstract
Beside their key role in the regulation of cholesterol homeostasis, HDL exhibit antioxidant and anti-inflammatory properties that participate to their general antiatherogenic effect. The purpose of this review is to summarize the recent findings on antioxidant activity and cytoprotective cell signalling elicited by HDL against oxidized LDL and proatherogenic agents in vascular cells. HDL exhibit an antioxidant activity efficient to prevent LDL oxidation, or to inactivate newly formed lipid oxidation products. The antioxidant ability of HDL is due to the apoprotein moiety and to the presence of associated enzymes, paraoxonase and PAF-Acetyl Hydrolase. HDL prevent the intracellular oxidative stress and the inflammatory response elicited by oxidized LDL (ox-LDL), by inhibiting the NFkappaB signalling pathway, and the subsequent inflammatory events (expression of adhesion molecules, recruitment and proliferation of mononuclear cells within the vascular wall). HDL prevent ox-LDL-mediated cell activation and proliferation, this being also attributed to the presence in HDL of sphingosine-1 phosphate which modulates the migration and survival of vascular cells. Lastly, HDL inhibit apoptosis elicited by ox-LDL in vascular cells. Recent evidences indicate that, beside their strong antiatherogenic properties, HDL could exert their protective effect in diseases generally associated to inflammatory events.
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42
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Carter CJ. Convergence of genes implicated in Alzheimer's disease on the cerebral cholesterol shuttle: APP, cholesterol, lipoproteins, and atherosclerosis. Neurochem Int 2006; 50:12-38. [PMID: 16973241 DOI: 10.1016/j.neuint.2006.07.007] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2006] [Revised: 06/30/2006] [Accepted: 07/11/2006] [Indexed: 11/24/2022]
Abstract
Polymorphic genes associated with Alzheimer's disease (see ) delineate a clearly defined pathway related to cerebral and peripheral cholesterol and lipoprotein homoeostasis. They include all of the key components of a glia/neurone cholesterol shuttle including cholesterol binding lipoproteins APOA1, APOA4, APOC1, APOC2, APOC3, APOD, APOE and LPA, cholesterol transporters ABCA1, ABCA2, lipoprotein receptors LDLR, LRP1, LRP8 and VLDLR, and the cholesterol metabolising enzymes CYP46A1 and CH25H, whose oxysterol products activate the liver X receptor NR1H2 and are metabolised to esters by SOAT1. LIPA metabolises cholesterol esters, which are transported by the cholesteryl ester transport protein CETP. The transcription factor SREBF1 controls the expression of most enzymes of cholesterol synthesis. APP is involved in this shuttle as it metabolises cholesterol to 7-betahydroxycholesterol, a substrate of SOAT1 and HSD11B1, binds to APOE and is tethered to LRP1 via APPB1, APBB2 and APBB3 at the cytoplasmic domain and via LRPAP1 at the extracellular domain. APP cleavage products are also able to prevent cholesterol binding to APOE. BACE cleaves both APP and LRP1. Gamma-secretase (PSEN1, PSEN2, NCSTN) cleaves LRP1 and LRP8 as well as APP and their degradation products control transcription factor TFCP2, which regulates thymidylate synthase (TS) and GSK3B expression. GSK3B is known to phosphorylate the microtubule protein tau (MAPT). Dysfunction of this cascade, carved out by genes implicated in Alzheimer's disease, may play a major role in its pathology. Many other genes associated with Alzheimer's disease affect cholesterol or lipoprotein function and/or have also been implicated in atherosclerosis, a feature of Alzheimer's disease, and this duality may well explain the close links between vascular and cerebral pathology in Alzheimer's disease. The definition of many of these genes as risk factors is highly contested. However, when polymorphic susceptibility genes belong to the same signaling pathway, the risk associated with multigenic disease is better related to the integrated effects of multiple polymorphisms of genes within the same pathway than to variants in any single gene [Wu, X., Gu, J., Grossman, H.B., Amos, C.I., Etzel, C., Huang, M., Zhang, Q., Millikan, R.E., Lerner, S., Dinney, C.P., Spitz, M.R., 2006. Bladder cancer predisposition: a multigenic approach to DNA-repair and cell-cycle-control genes. Am. J. Hum. Genet. 78, 464-479.]. Thus, the fact that Alzheimer's disease susceptibility genes converge on a clearly defined signaling network has important implications for genetic association studies.
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Nguyen SD, Jeong TS, Sok DE. Apolipoprotein A-I-mimetic peptides with antioxidant actions. Arch Biochem Biophys 2006; 451:34-42. [PMID: 16759634 DOI: 10.1016/j.abb.2006.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2006] [Revised: 04/10/2006] [Accepted: 04/11/2006] [Indexed: 11/16/2022]
Abstract
To augment antioxidant action of apolipoprotein A-I (Apo A-I)-mimetic peptide, the peptide F3,6,14,18 18A (DWFKAFYDKVAEKFKEAF) was modified by incorporating antioxidant amino acid residues. Introduction of His residue at position 2 or 3 at N-terminal of the peptide remarkably enhanced antioxidant action against Cu2+ oxidation of LDL and the capability of sequestering Cu2+. Likewise, the substitution of Ala for Cys residue at position 12 increased antioxidant action against Cu2+ oxidation of LDL. Additionally, the Cys substitution contributed to enhanced capabilities in the removal of hypochlorous acid (HOCl) and 13-hydroperoxyoctadecadienoic acid. Furthermore, the combined incorporation of His and Cys residues enhanced antioxidant actions in preventing Cu2+ oxidation and reducing HOCl and hydroperoxide levels. Separately, in solubilizing phosphatidylcholine, either peptides with His residue at N-terminal position 2 or 3, or those containing Cys residue at position 11 or 12 were equipotent to peptide F3,6,14,18 18A. Further, the lipid-solubilizing ability of those containing both His and Cys residues was comparable to that of peptide F3,6,14,18 18A. In support of this, a similar structural importance was observed with Trp fluorescence study illustrating the penetration of peptides in phosphatidylcholine liposome. Besides, the modified peptides were also comparable to peptide F3,6,14,18 18A in restoring phosphatidylserine-induced loss of PON1 activity. These results indicate that the insertion of His or Cys residue into peptide F3,6,14,18 18A at appropriate positions could lead to enhanced antioxidant action with no significant change of lipid-solubilizing action.
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Affiliation(s)
- Su Duy Nguyen
- College of Pharmacy, Chungnam National University, Yuseong-Ku, Taejon 305-764, Republic of Korea
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44
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Solakivi T, Jaakkola O, Salomäki A, Peltonen N, Metso S, Lehtimäki T, Jokela H, Nikkari ST. HDL enhances oxidation of LDL in vitro in both men and women. Lipids Health Dis 2005; 4:25. [PMID: 16242018 PMCID: PMC1285367 DOI: 10.1186/1476-511x-4-25] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2005] [Accepted: 10/20/2005] [Indexed: 02/02/2023] Open
Abstract
Background Oxidative modification of low-density lipoprotein (LDL) is a key event in the oxidation hypothesis of atherogenesis. Some in vitro experiments have previously suggested that high-density lipoprotein (HDL) co-incubated with LDL prevents Cu2+-induced oxidation of LDL, while some other studies have observed an opposite effect. To comprehensively clarify the role of HDL in this context, we isolated LDL, HDL2 and HDL3 from sera of 61 free-living individuals (33 women and 28 men). Results When the isolated LDL was subjected to Cu2+-induced oxidation, both HDL2 and HDL3 particles increased the rate of appearance and the final concentration of conjugated dienes similarly in both genders. Oxidation rate was positively associated with polyunsaturated fatty acid content of the lipoproteins in that it was positively related to the content of linoleate and negatively related to oleate. More saturated fats thus protected the lipoproteins from damage. Conclusion We conclude that in vitro HDL does not protect LDL from oxidation, but is in fact oxidized fastest of all lipoproteins due to its fatty acid composition, which is oxidation promoting.
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Affiliation(s)
- T Solakivi
- Department of Medical Biochemistry, University of Tampere, Medical School, Tampere, Finland
| | - O Jaakkola
- Institute of Medical Technology, University of Tampere, Tampere, Finland
| | - A Salomäki
- Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Tampere University Hospital, Tampere, Finland
| | - N Peltonen
- Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Tampere University Hospital, Tampere, Finland
| | - S Metso
- Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Tampere University Hospital, Tampere, Finland
- Department of Internal Medicine, Tampere University Hospital, Tampere, Finland
| | - T Lehtimäki
- Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Tampere University Hospital, Tampere, Finland
| | - H Jokela
- Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Tampere University Hospital, Tampere, Finland
| | - ST Nikkari
- Department of Medical Biochemistry, University of Tampere, Medical School, Tampere, Finland
- Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Tampere University Hospital, Tampere, Finland
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45
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Esteve E, Ricart W, Fernández-Real JM. Dyslipidemia and inflammation: an evolutionary conserved mechanism. Clin Nutr 2005; 24:16-31. [PMID: 15681098 DOI: 10.1016/j.clnu.2004.08.004] [Citation(s) in RCA: 305] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2004] [Accepted: 08/16/2004] [Indexed: 12/17/2022]
Abstract
Inflammation leads to changes in lipid metabolism aimed at decreasing the toxicity of a variety of harmful agents and tissue repair by redistributing nutrients to cells involved in host defence. Acute phase response, mediated by cytokines, preserves the host from acute injury. When this inflammation becomes chronic, it might lead to chronic disorders as atherosclerosis and the metabolic syndrome. The activation of the inflammatory cascade will induce a decrease in HDL-cholesterol (HDL-C), with impairment in reverse cholesterol transport, and parallel changes in apolipoproteins, enzymes, anti-oxidant capacity and ATP binding cassette A1-dependent efflux. This decrease in HDL-C and phospholipids could stimulate compensatory changes, as synthesis and accumulation of phospholipid-rich VLDL which binds bacterial products and other toxic substances, resulting in hypertriglyceridemia. The final consequence is an increased accumulation of cholesterol in cells. When the compensatory response (inflammation) is not able to repair injury, it turns into a harmful reaction, and the lipid changes will become chronic, either by repeated or overwhelming stimulus, enhancing the formation of atherosclerotic lesions. Thus, the classical lipid changes associated with the metabolic syndrome (increased triglycerides and decreased HDL-C) may be envisioned as a highly conserved evolutionary response aimed at tissue repair. Under this assumption, the problem is not the response but the persistence of the stimulus.
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Affiliation(s)
- Eduardo Esteve
- Sección de Diabetes, Endocrinología y Nutrición, Hospital Universitario de Girona "Dr Josep Trueta", Avenida de Francia s/n, 17007 Girona, Spain
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46
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Yuan XM, Li W, Baird SK, Carlsson M, Melefors O. Secretion of ferritin by iron-laden macrophages and influence of lipoproteins. Free Radic Res 2005; 38:1133-42. [PMID: 15512802 DOI: 10.1080/10715760400011692] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Increasing evidence supports a role of cellular iron in the initiation and development of atherosclerosis. We and others reported earlier that iron-laden macrophages are associated with LDL oxidation, angiogenesis, nitric oxide production and apoptosis in atherosclerotic processes. Here we have further studied perturbed iron metabolism in macrophages, their interaction with lipoproteins and the origin of iron accumulation in human atheroma. In both early and advanced human atheroma lesions, hemoglobin and ferritin accumulation correlated with the macrophage-rich areas. Iron uptake into macrophages, via transferrin receptors or scavenger receptor-mediated erythrophagocytosis, increased cellular iron and accelerated ferritin synthesis at both mRNA and protein levels. The binding activity of iron regulatory proteins was enhanced by desferrioxamine (DFO) and decreased by hemin and iron compounds. Iron-laden macrophages exocytosed both iron and ferritin into the culture medium. Exposure to oxidized low-density lipoprotein (oxLDL, >or=50 microg/mL) resulted in <20% apoptosis of iron-laden human macrophages, but cells remained impermeable after a 24 h period and an increased excretion of ferritin could be observed by immunostaining techniques. Exposure to high-density lipoprotein (HDL) significantly decreased ferritin excretion from these cells. We conclude: (i) erythrophagocytosis and hemoglobin catabolism by macrophages contribute to ferritin accumulation in human atherosclerotic lesions and; (ii) iron uptake into macrophages leads to increased synthesis and secretion of ferritin; (iii) oxidized LDL and HDL have different effects on these processes.
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Affiliation(s)
- Xi-Ming Yuan
- Division of Pathology II, Faculty of Health Sciences, Linköping University, SE-581 85 Linköping, Sweden.
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47
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Wu A, Hinds CJ, Thiemermann C. High-density lipoproteins in sepsis and septic shock: metabolism, actions, and therapeutic applications. Shock 2004; 21:210-21. [PMID: 14770033 DOI: 10.1097/01.shk.0000111661.09279.82] [Citation(s) in RCA: 137] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Sepsis and septic shock are important causes of morbidity and lethality in noncoronary intensive care units. Circulating levels of high-density lipoproteins (HDLs) are reduced in sepsis/septic shock, and the magnitude of this reduction is positively correlated with the severity of the illness. The mechanisms underlying this phenomenon are incompletely understood, although increased levels of several acute-phase proteins, including serum amyloid A (SAA) and secretory phospholipase A2 (sPLA2), may contribute to the decrease in plasma HDLs. It has been suggested that HDLs possess anti-inflammatory properties and, hence, may play a crucial role in innate immunity by regulating the inflammatory response as well as being capable of reducing the severity of organ injury in animals and patients with septic shock. These protective effects of HDLs are mediated mainly via (a) lipopolysaccharide (LPS) binding and neutralization, (b) the HDL-associated enzymes, plasma paraoxonase (PON1) and platelet-activating factor acetylhydrolase (PAF-AH), which protect low-density lipoproteins against peroxidative damage, (c) inhibition of the expression of endothelial cell adhesion molecules and release of proinflammatory cytokines, which prevents inflammatory cell infiltration and subsequent multiple organ dysfunction, and (d) stimulation of the expression of endothelial nitric oxide synthase (eNOS). Thus, HDL exerts potent anti-inflammatory effects, some of which are independent of endotoxin binding and might be useful in the treatment of patients with not only sepsis/septic shock but also other conditions associated with an uncontrolled inflammatory response, such as ischemia-reperfusion injury and hemorrhagic shock.
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Affiliation(s)
- Aihua Wu
- Department of Anaesthesia, Beijing Hospital, Beijing 100730, PR China
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48
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Hansel B, Giral P, Nobecourt E, Chantepie S, Bruckert E, Chapman MJ, Kontush A. Metabolic syndrome is associated with elevated oxidative stress and dysfunctional dense high-density lipoprotein particles displaying impaired antioxidative activity. J Clin Endocrinol Metab 2004; 89:4963-71. [PMID: 15472192 DOI: 10.1210/jc.2004-0305] [Citation(s) in RCA: 303] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A metabolic syndrome (MetS) phenotype is characterized by insulin-resistance, atherogenic dyslipidemia, oxidative stress, and elevated cardiovascular risk and frequently involves subnormal levels of high-density lipoprotein (HDL) cholesterol. We evaluated the capacity of physicochemically distinct HDL subfractions from MetS subjects to protect low-density lipoprotein against oxidative stress.MetS subjects presented an insulin-resistant phenotype, with central obesity and elevation in systolic blood pressure and plasma triglyceride, LDL-cholesterol, apolipoprotein B, glucose, and insulin levels. Systemic oxidative stress, assessed as plasma 8-isoprostanes, was significantly higher (3.7-fold) in MetS subjects (n = 10) compared with nonobese normolipidemic controls (n = 11). In MetS, small, dense HDL3a, 3b, and 3c subfractions possessed significantly lower specific antioxidative activity (up to -23%, on a unit particle mass basis) than their counterparts in controls. In addition, HDL2a and 3a subfractions from MetS patients possessed lower total antioxidative activity (up to -41%, at equivalent plasma concentrations). The attenuated antioxidative activity of small, dense HDL subfractions correlated with systemic oxidative stress and insulin resistance and was associated with HDL particles exhibiting altered physicochemical properties (core triglyceride enrichment and cholesteryl ester depletion). We conclude that antioxidative activity of small, dense HDL subfractions of altered chemical composition is impaired in MetS and associated with elevated oxidative stress and insulin resistance. Induction of selective increase in the circulating concentrations of dense HDL subfractions may represent an innovative therapeutic approach for the attenuation of high cardiovascular risk in MetS.
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Affiliation(s)
- Boris Hansel
- Dyslipoproteinemia and Atherosclerosis Research Unit, National Institute for Health and Medical Research, Institut National de la Santé et de la Recherche Médicale, Hôpital de la Pitié, 75013 Paris, France
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49
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Abstract
The concentration of high density lipoprotein cholesterol (HDL-C) has been found to be a powerful negative predictor of premature coronary heart disease (CHD) and stroke in human prospective population studies. Evidence of the protective properties of HDLs has also been documented in the elderly and their offspring. HDLs mediate several functions that provide an insight into their potential anti-atherogenic mechanisms. Intervention strategies to prevent CHD have generally focused on lowering low-density lipoprotein cholesterol (LDL-C). However, several lifestyle and pharmacological interventions have the capacity to raise the level of HDL-C. As data accumulate on the protective role of HDLs, there is growing support for interventions that act to raise HDL-C concentrations.
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Affiliation(s)
- Philip Barter
- The Heart Research Institute, 145 Missenden Road, Camperdown, Sydney, NSW 2050, Australia.
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50
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Khovidhunkit W, Kim MS, Memon RA, Shigenaga JK, Moser AH, Feingold KR, Grunfeld C. Effects of infection and inflammation on lipid and lipoprotein metabolism: mechanisms and consequences to the host. J Lipid Res 2004; 45:1169-96. [PMID: 15102878 DOI: 10.1194/jlr.r300019-jlr200] [Citation(s) in RCA: 1022] [Impact Index Per Article: 51.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Infection and inflammation induce the acute-phase response (APR), leading to multiple alterations in lipid and lipoprotein metabolism. Plasma triglyceride levels increase from increased VLDL secretion as a result of adipose tissue lipolysis, increased de novo hepatic fatty acid synthesis, and suppression of fatty acid oxidation. With more severe infection, VLDL clearance decreases secondary to decreased lipoprotein lipase and apolipoprotein E in VLDL. In rodents, hypercholesterolemia occurs attributable to increased hepatic cholesterol synthesis and decreased LDL clearance, conversion of cholesterol to bile acids, and secretion of cholesterol into the bile. Marked alterations in proteins important in HDL metabolism lead to decreased reverse cholesterol transport and increased cholesterol delivery to immune cells. Oxidation of LDL and VLDL increases, whereas HDL becomes a proinflammatory molecule. Lipoproteins become enriched in ceramide, glucosylceramide, and sphingomyelin, enhancing uptake by macrophages. Thus, many of the changes in lipoproteins are proatherogenic. The molecular mechanisms underlying the decrease in many of the proteins during the APR involve coordinated decreases in several nuclear hormone receptors, including peroxisome proliferator-activated receptor, liver X receptor, farnesoid X receptor, and retinoid X receptor. APR-induced alterations initially protect the host from the harmful effects of bacteria, viruses, and parasites. However, if prolonged, these changes in the structure and function of lipoproteins will contribute to atherogenesis.
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Affiliation(s)
- Weerapan Khovidhunkit
- Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine, Chulalongkorn University and King Chulalongkorn Memorial Hospital, Bangkok, Thailand
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