151
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Iborra RT, Machado-Lima A, Okuda LS, Pinto PR, Nakandakare ER, Machado UF, Correa-Giannella ML, Pickford R, Woods T, Brimble MA, Rye KA, Lu R, Yokoyama S, Passarelli M. AGE-albumin enhances ABCA1 degradation by ubiquitin-proteasome and lysosomal pathways in macrophages. J Diabetes Complications 2018; 32:1-10. [PMID: 29097054 DOI: 10.1016/j.jdiacomp.2017.09.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/06/2017] [Accepted: 09/20/2017] [Indexed: 12/22/2022]
Abstract
BACKGROUND AND AIMS Advanced glycation end products (AGEs) induce cellular oxidative/endoplasmic reticulum stress and inflammation. We investigated its underlying mechanisms for atherogenesis focusing on regulation of ABCA1 protein decay in macrophages. METHODS The ABCA1 decay rate was evaluated in macrophages after treatment with LXR agonist and by incubation with control (C) or AGE-albumin concomitant or not with cycloheximide, MG-132, ammonium chloride and calpain inhibitors were utilized to inhibit, respectively, proteasome, lysosome and ABCA1 proteolysis at cell surface. ABCA1 was determined by immunoblot and the protein decay rate calculated along time by the slope of the linear regression. Ubiquitination level was determined in ABCA1 immunoprecipitated from whole cell lysate or bulk cell membrane. AGE effect was also analyzed in THP-1 cells transfected with siRNA-RAGE. Carboxymethyllysine (CML) and pyrraline (PYR) were determined by LC/MS. One-way ANOVA and Student t test were utilized to compare results. RESULTS CML and PYR-albumin were higher in AGE-albumin as compared to C. AGE-albumin reduced ABCA1 in J774 and THP-1 macrophages (20-30%) and induced a higher ABCA1 ubiquitination and a faster protein decay rate that was dependent on the presence of AGE during the kinetics of measurement in the presence of cycloheximide. Proteasomal inhibition restored and lysosomal inhibition partially recovered ABCA1 in cells treated with AGE-albumin. Calpain inhibition was not able to rescue ABCA1. RAGE knockdown prevented the reduction in ABCA1 elicited by AGE. CONCLUSIONS AGE-albumin diminishes ABCA1 by accelerating its degradation through the proteasomal and lysosomal systems. This may increase lipid accumulation in macrophages by diminishing cholesterol efflux via RAGE signaling contributing to atherosclerosis in diabetes mellitus.
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Affiliation(s)
- Rodrigo Tallada Iborra
- Laboratorio de Lipides, LIM-10, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Universidade de Sao Paulo, São Paulo, Brazil
| | - Adriana Machado-Lima
- Laboratorio de Lipides, LIM-10, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Universidade de Sao Paulo, São Paulo, Brazil; Universidade São Judas Tadeu, São Paulo, Brazil
| | - Ligia Shimabukuro Okuda
- Laboratorio de Lipides, LIM-10, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Universidade de Sao Paulo, São Paulo, Brazil
| | - Paula Ramos Pinto
- Laboratorio de Lipides, LIM-10, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Universidade de Sao Paulo, São Paulo, Brazil
| | - Edna Regina Nakandakare
- Laboratorio de Lipides, LIM-10, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Universidade de Sao Paulo, São Paulo, Brazil
| | - Ubiratan Fabres Machado
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Maria Lucia Correa-Giannella
- Laboratorio de Carboidratos e Radioimunoinsaio, LIM 18, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Universidade de Sao Paulo, São Paulo, Brazil; Programa de pós-Graduação em Medicina, Universidade Nove de Julho, São Paulo, Brazil
| | - Russell Pickford
- Bioanalytical Mass Spectrometry Facility, University of New South Wales, Sydney, Australia
| | - Tom Woods
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Margaret A Brimble
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Kerry-Anne Rye
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales, Sydney, Australia
| | - Rui Lu
- Nutritional Health Science Research Center at Chubu University, Kasugai, Japan
| | - Shinji Yokoyama
- Nutritional Health Science Research Center at Chubu University, Kasugai, Japan
| | - Marisa Passarelli
- Laboratorio de Lipides, LIM-10, Hospital das Clinicas HCFMUSP, Faculdade de Medicina da Universidade de Sao Paulo, São Paulo, Brazil.
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152
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Dron JS, Wang J, Low-Kam C, Khetarpal SA, Robinson JF, McIntyre AD, Ban MR, Cao H, Rhainds D, Dubé MP, Rader DJ, Lettre G, Tardif JC, Hegele RA. Polygenic determinants in extremes of high-density lipoprotein cholesterol. J Lipid Res 2017; 58:2162-2170. [PMID: 28870971 PMCID: PMC5665671 DOI: 10.1194/jlr.m079822] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 08/31/2017] [Indexed: 11/24/2022] Open
Abstract
HDL cholesterol (HDL-C) remains a superior biochemical predictor of CVD risk, but its genetic basis is incompletely defined. In patients with extreme HDL-C concentrations, we concurrently evaluated the contributions of multiple large- and small-effect genetic variants. In a discovery cohort of 255 unrelated lipid clinic patients with extreme HDL-C levels, we used a targeted next-generation sequencing panel to evaluate rare variants in known HDL metabolism genes, simultaneously with common variants bundled into a polygenic trait score. Two additional cohorts were used for validation and included 1,746 individuals from the Montréal Heart Institute Biobank and 1,048 individuals from the University of Pennsylvania. Findings were consistent between cohorts: we found rare heterozygous large-effect variants in 18.7% and 10.9% of low- and high-HDL-C patients, respectively. We also found common variant accumulation, indicated by extreme polygenic trait scores, in an additional 12.8% and 19.3% of overall cases of low- and high-HDL-C extremes, respectively. Thus, the genetic basis of extreme HDL-C concentrations encountered clinically is frequently polygenic, with contributions from both rare large-effect and common small-effect variants. Multiple types of genetic variants should be considered as contributing factors in patients with extreme dyslipidemia.
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Affiliation(s)
- Jacqueline S Dron
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Jian Wang
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Cécile Low-Kam
- Montréal Heart Institute et Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Sumeet A Khetarpal
- Departments of Genetics and Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - John F Robinson
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Adam D McIntyre
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Matthew R Ban
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - Henian Cao
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
| | - David Rhainds
- Montréal Heart Institute et Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Marie-Pierre Dubé
- Montréal Heart Institute et Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Daniel J Rader
- Departments of Genetics, Medicine, and Pediatrics, the Cardiovascular Institute, and the Institute for Translational Medicine and Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
| | - Guillaume Lettre
- Montréal Heart Institute et Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Jean-Claude Tardif
- Montréal Heart Institute et Faculté de Médecine, Université de Montréal, Montréal, Québec, Canada
| | - Robert A Hegele
- Department of Biochemistry, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
- Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
- Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada
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153
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Xu B, Gillard BK, Gotto AM, Rosales C, Pownall HJ. ABCA1-Derived Nascent High-Density Lipoprotein-Apolipoprotein AI and Lipids Metabolically Segregate. Arterioscler Thromb Vasc Biol 2017; 37:2260-2270. [PMID: 29074589 DOI: 10.1161/atvbaha.117.310290] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 10/16/2017] [Indexed: 12/30/2022]
Abstract
OBJECTIVE Reverse cholesterol transport comprises cholesterol efflux from ABCA1-expressing macrophages to apolipoprotein (apo) AI, giving nascent high-density lipoprotein (nHDL), esterification of nHDL-free cholesterol (FC), selective hepatic extraction of HDL lipids, and hepatic conversion of HDL cholesterol to bile salts, which are excreted. We tested this model by identifying the fates of nHDL-[3H]FC, [14C] phospholipid (PL), and [125I]apo AI in serum in vitro and in vivo. APPROACH AND RESULTS During in vitro incubation of human serum, nHDL-[3H]FC and [14C]PL rapidly transfer to HDL and low-density lipoproteins (t1/2=2-7 minutes), whereas nHDL-[125I]apo AI transfers solely to HDL (t1/2<10 minutes) and to the lipid-free form (t1/2>480 minutes). After injection into mice, nHDL-[3H]FC and [14C]PL rapidly transfer to liver (t1/2=≈2-3 minutes), whereas apo AI clears with t1/2=≈460 minutes. The plasma nHDL-[3H]FC esterification rate is slow (0.46%/h) compared with hepatic uptake. PL transfer protein enhances nHDL-[14C]PL but not nHDL-[3H]FC transfer to cultured Huh7 hepatocytes. CONCLUSIONS nHDL-FC, PL, and apo AI enter different pathways in vivo. Most nHDL-[3H]FC and [14C]PL are rapidly extracted by the liver via SR-B1 (scavenger receptor class B member 1) and spontaneous transfer; hepatic PL uptake is promoted by PL transfer protein. nHDL-[125I]apo AI transfers to HDL and to the lipid-free form that can be recycled to nHDL formation. Cholesterol esterification by lecithin:cholesterol acyltransferase is a minor process in nHDL metabolism. These findings could guide the design of therapies that better mobilize peripheral tissue-FC to hepatic disposal.
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Affiliation(s)
- Bingqing Xu
- From the Center for Bioenergetics and Department of Medicine, Houston Methodist Research Institute, TX (B.X., B.K.G., A.M.G., C.R., H.J.P.); and Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, China (B.X.)
| | - Baiba K Gillard
- From the Center for Bioenergetics and Department of Medicine, Houston Methodist Research Institute, TX (B.X., B.K.G., A.M.G., C.R., H.J.P.); and Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, China (B.X.)
| | - Antonio M Gotto
- From the Center for Bioenergetics and Department of Medicine, Houston Methodist Research Institute, TX (B.X., B.K.G., A.M.G., C.R., H.J.P.); and Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, China (B.X.)
| | - Corina Rosales
- From the Center for Bioenergetics and Department of Medicine, Houston Methodist Research Institute, TX (B.X., B.K.G., A.M.G., C.R., H.J.P.); and Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, China (B.X.)
| | - Henry J Pownall
- From the Center for Bioenergetics and Department of Medicine, Houston Methodist Research Institute, TX (B.X., B.K.G., A.M.G., C.R., H.J.P.); and Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, China (B.X.).
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154
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Hsiao JHT, Halliday GM, Kim WS. α-Synuclein Regulates Neuronal Cholesterol Efflux. Molecules 2017; 22:molecules22101769. [PMID: 29048372 PMCID: PMC6151759 DOI: 10.3390/molecules22101769] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 10/18/2017] [Accepted: 10/19/2017] [Indexed: 12/15/2022] Open
Abstract
α-Synuclein is a neuronal protein that is at the center of focus in understanding the etiology of a group of neurodegenerative diseases called α-synucleinopathies, which includes Parkinson's disease (PD). Despite much research, the exact physiological function of α-synuclein is still unclear. α-Synuclein has similar biophysical properties as apolipoproteins and other lipid-binding proteins and has a high affinity for cholesterol. These properties suggest a possible role for α-synuclein as a lipid acceptor mediating cholesterol efflux (the process of removing cholesterol out of cells). To test this concept, we "loaded" SK-N-SH neuronal cells with fluorescently-labelled cholesterol, applied exogenous α-synuclein, and measured the amount of cholesterol removed from the cells using a classic cholesterol efflux assay. We found that α-synuclein potently stimulated cholesterol efflux. We found that the process was dose and time dependent, and was saturable at 1.0 µg/mL of α-synuclein. It was also dependent on the transporter protein ABCA1 located on the plasma membrane. We reveal for the first time a novel role of α-synuclein that underscores its importance in neuronal cholesterol regulation, and identify novel therapeutic targets for controlling cellular cholesterol levels.
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Affiliation(s)
- Jen-Hsiang T Hsiao
- Brain and Mind Centre, Sydney Medical School, The University of Sydney, Sydney NSW 2050, Australia.
- Neuroscience Research Australia, Sydney NSW 2031, Australia.
- School of Medical Sciences, University of New South Wales, Sydney NSW 2052, Australia.
| | - Glenda M Halliday
- Brain and Mind Centre, Sydney Medical School, The University of Sydney, Sydney NSW 2050, Australia.
- Neuroscience Research Australia, Sydney NSW 2031, Australia.
- School of Medical Sciences, University of New South Wales, Sydney NSW 2052, Australia.
| | - Woojin Scott Kim
- Brain and Mind Centre, Sydney Medical School, The University of Sydney, Sydney NSW 2050, Australia.
- Neuroscience Research Australia, Sydney NSW 2031, Australia.
- School of Medical Sciences, University of New South Wales, Sydney NSW 2052, Australia.
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155
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Zamanian-Daryoush M, Lindner DJ, DiDonato JA, Wagner M, Buffa J, Rayman P, Parks JS, Westerterp M, Tall AR, Hazen SL. Myeloid-specific genetic ablation of ATP-binding cassette transporter ABCA1 is protective against cancer. Oncotarget 2017; 8:71965-71980. [PMID: 29069761 PMCID: PMC5641104 DOI: 10.18632/oncotarget.18666] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 05/23/2017] [Indexed: 02/07/2023] Open
Abstract
Increased circulating levels of apolipoprotein A-I (apoA-I), the major protein of high-density lipoprotein (HDL), by genetic manipulation or infusion, protects against melanoma growth and metastasis. Herein, we explored potential roles in melanoma tumorigenesis for host scavenger receptor class B, type 1 (SR-B1), and ATP-binding cassette transporters A1 (ABCA1) and G1 (ABCG1), all mediators of apoA-I and HDL sterol and lipid transport function. In a syngeneic murine melanoma tumor model, B16F10, mice with global deletion of SR-B1 expression exhibited increased plasma HDL cholesterol (HDLc) levels and decreased tumor volume, indicating host SR-B1 does not directly contribute to HDL-associated anti-tumor activity. In mice with myeloid-specific loss of ABCA1 (Abca1-M/-M ; A1-M/-M), tumor growth was inhibited by ∼4.8-fold relative to wild type (WT) animals. Abcg1-M/-M (G1-M/-M) animals were also protected by 2.5-fold relative to WT, with no further inhibition of tumor growth in Abca1/Abcg1 myeloid-specific double knockout animals (DKO). Analyses of tumor-infiltrating immune cells revealed a correlation between tumor protection and decreased presence of the immune suppressive myeloid-derived suppressor cell (MDSC) subsets, Ly-6G+Ly-6CLo and Ly-6GnegLy-6CHi cells. The growth of the syngeneic MB49 murine bladder cancer cells was also inhibited in A1-M/-M mice. Collectively, our studies provide further evidence for an immune modulatory role for cholesterol homeostasis pathways in cancer.
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Affiliation(s)
| | - Daniel J. Lindner
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Joseph A. DiDonato
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Matthew Wagner
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Jennifer Buffa
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Patricia Rayman
- Department of Immunology, Cleveland Clinic, Cleveland, OH 44195, USA
| | - John S. Parks
- Department of Internal Medicine, Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Marit Westerterp
- Department of Medicine, Columbia University, College of Physicians and Surgeons 8-401, New York, NY 10032, USA
| | - Alan R. Tall
- Department of Medicine, Columbia University, College of Physicians and Surgeons 8-401, New York, NY 10032, USA
| | - Stanley L. Hazen
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
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156
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Tao F, Weinstock J, Venners SA, Cheng J, Hsu YH, Zou Y, Pan F, Jiang S, Zha X, Xu X. Associations of the ABCA1 and LPL Gene Polymorphisms With Lipid Levels in a Hyperlipidemic Population. Clin Appl Thromb Hemost 2017; 24:771-779. [PMID: 28891316 DOI: 10.1177/1076029617725601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We conducted a cross-sectional study to investigate the effects of the adenosine triphosphate-binding cassette transporter 1 (ABCA1) I883M and lipoprotein lipase (LPL) HindIII polymorphisms on lipid levels in patients with hyperlipidemia. A total of 533 patients were enrolled. Serum lipid parameters were determined by an automatic biochemistry analyzer. Genotyping of the ABCA1 I883M and LPL HindIII was carried out using the polymerase chain reaction-restriction fragment length polymorphism technique. Multiple linear regression analysis was used to estimate the associations between serum lipid levels and the genetic polymorphisms. The frequency distribution of the ABCA1 I883M and LPL HindIII polymorphisms did not deviate from Hardy-Weinberg equilibrium. The major finding of our regression analysis showed that neither the ABCA1 I883M nor the LPL HindIII polymorphism was associated with baseline serum lipid levels in the total population. However, among patients with elevated alanine aminotransferase (ALT) levels (ALT ≥ 40 U/L), carriers of the M allele of the ABCA1 gene had lower levels of high-density lipoprotein cholesterol (HDL-C) and higher levels of low-density lipoprotein cholesterol (LDL-C) after adjusting for age, sex, smoking status, alcohol consumption, education level, occupation, and work intensity ( P < .05 for both). A test on interaction terms between the ABCA1 I833M polymorphism and ALT on HDL-C and LDL-C levels also remained significant ( P = .001 and P = .014, respectively). Our data suggest that there are significant interactive effects between ABCA1 I883M and ALT levels on HDL-C and LDL-C levels. However, the LPL HindIII polymorphism did not influence lipid levels.
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Affiliation(s)
- Fang Tao
- 1 School of Life Sciences, Anhui University, Hefei, China
| | - Justin Weinstock
- 2 Department of Statistics, University of Virginia, Charlottesville, VA, USA
| | - Scott A Venners
- 3 Faculty of Health Sciences, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Jun Cheng
- 1 School of Life Sciences, Anhui University, Hefei, China
| | - Yi-Hsiang Hsu
- 4 Institute for Aging Research, HSL and Harvard Medical School, Boston, MA, USA.,5 Molecular and Integrative Physiological Sciences Program, Harvard School of Public Health, Boston, MA, USA
| | - Yanfeng Zou
- 6 Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, China
| | - Faming Pan
- 6 Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, China
| | - Shanqun Jiang
- 1 School of Life Sciences, Anhui University, Hefei, China.,7 Institute of Biomedicine, Anhui Medical University, Hefei, China
| | - Xiangdong Zha
- 1 School of Life Sciences, Anhui University, Hefei, China
| | - Xiping Xu
- 8 Division of Epidemiology and Biostatistics, University of Illinois at Chicago School of Public Health, Chicago, IL, USA
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157
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Critical Role of the Human ATP-Binding Cassette G1 Transporter in Cardiometabolic Diseases. Int J Mol Sci 2017; 18:ijms18091892. [PMID: 28869506 PMCID: PMC5618541 DOI: 10.3390/ijms18091892] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Revised: 08/30/2017] [Accepted: 08/30/2017] [Indexed: 12/15/2022] Open
Abstract
ATP-binding cassette G1 (ABCG1) is a member of the large family of ABC transporters which are involved in the active transport of many amphiphilic and lipophilic molecules including lipids, drugs or endogenous metabolites. It is now well established that ABCG1 promotes the export of lipids, including cholesterol, phospholipids, sphingomyelin and oxysterols, and plays a key role in the maintenance of tissue lipid homeostasis. Although ABCG1 was initially proposed to mediate cholesterol efflux from macrophages and then to protect against atherosclerosis and cardiovascular diseases (CVD), it becomes now clear that ABCG1 exerts a larger spectrum of actions which are of major importance in cardiometabolic diseases (CMD). Beyond a role in cellular lipid homeostasis, ABCG1 equally participates to glucose and lipid metabolism by controlling the secretion and activity of insulin and lipoprotein lipase. Moreover, there is now a growing body of evidence suggesting that modulation of ABCG1 expression might contribute to the development of diabetes and obesity, which are major risk factors of CVD. In order to provide the current understanding of the action of ABCG1 in CMD, we here reviewed major findings obtained from studies in mice together with data from the genetic and epigenetic analysis of ABCG1 in the context of CMD.
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158
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Dysfunctional HDL in diabetes mellitus and its role in the pathogenesis of cardiovascular disease. Mol Cell Biochem 2017; 440:167-187. [PMID: 28828539 DOI: 10.1007/s11010-017-3165-z] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/16/2017] [Indexed: 12/17/2022]
Abstract
Coronary artery disease, the leading cause of death in the developed and developing countries, is prevalent in diabetes mellitus with 68% cardiovascular disease (CVD)-related mortality. Epidemiological studies suggested inverse correlation between HDL and CVD occurrence. Therefore, low HDL concentration observed in diabetic patients compared to non-diabetic individuals was thought to be one of the primary causes of increased risks of CVD. Efforts to raise HDL level via CETP inhibitors, Torcetrapib and Dalcetrapib, turned out to be disappointing in outcome studies despite substantial increases in HDL-C, suggesting that factors beyond HDL concentration may be responsible for the increased risks of CVD. Therefore, recent studies have focused more on HDL function than on HDL levels. The metabolic environment in diabetes mellitus condition such as hyperglycemia-induced advanced glycation end products, oxidative stress, and inflammation promote HDL dysfunction leading to greater risks of CVD. This review discusses dysfunctional HDL as one of the mechanisms of increased CVD risks in diabetes mellitus through adversely affecting components that support HDL function in cholesterol efflux and LDL oxidation. The dampening of reverse cholesterol transport, a key process that removes cholesterol from lipid-laden macrophages in the arterial wall, leads to increased risks of CVD in diabetic patients. Therapeutic approaches to keep diabetes under control may benefit patients from developing CVD.
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159
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160
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Reduced platelet count, but no major platelet function abnormalities, are associated with loss-of-function ATP-binding cassette-1 gene mutations. Clin Sci (Lond) 2017. [PMID: 28634189 DOI: 10.1042/cs20170195] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Loss-of-function mutations of the the ATP-binding cassette-1 (ABCA1) gene are the cause of Tangier disease (TD) in homozygous subjects and familial HDL deficiency (FHD) in heterozygous subjects. These disorders are characterized by reduced plasma HDL-cholesterol (HDL-C) and altered efflux of cholesterol from cells. Previous studies in TD patients and ABCA1-/- murine models reported defects in platelet count, morphology, and function, but the issue is still controversial. We analyzed three subjects with low to very low HDL-C levels due to the loss-of-function mutations of the ABCA1 gene. Two related patients with FHD were heterozygous carriers of two mutations on the same ABCA1 allele; one, with TD, was homozygous for a different mutation. Mild to moderate thrombocytopenia was observed in all the patients. No morphological platelet abnormalities were detected under optical or EM. History of moderate bleeding tendency was recorded only in one of the FHD patients. Only limited alterations in platelet aggregation and activation of the integrin αIIbβ3 were observed in one FHD patient. While α-granule secretion (P-selectin), content, and secretion of platelet δ-granules (serotonin, ATP, and ADP) and thromboxane (TX) A2 synthesis were normal in all the patients, the expression of lysosomal CD63, in response to some agonists, was reduced in TD patients. In conclusion, three patients carrying ABCA1 genetic variants had low platelet count, with the lowest values observed in TD, not associated with major alterations in platelet morphology and response to agonists or bleeding.
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161
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Increased hepatic ABCA1 transporter is associated with hypercholesterolemia in a cholestatic rat model and primary biliary cholangitis patients. Med Mol Morphol 2017; 50:227-237. [DOI: 10.1007/s00795-017-0166-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 06/23/2017] [Indexed: 01/22/2023]
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162
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Zhou W, Zhuang Y, Sun J, Wang X, Zhao Q, Xu L, Wang Y. Variants of the ABCA3 gene might contribute to susceptibility to interstitial lung diseases in the Chinese population. Sci Rep 2017; 7:4097. [PMID: 28642621 PMCID: PMC5481373 DOI: 10.1038/s41598-017-04486-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Accepted: 05/16/2017] [Indexed: 01/06/2023] Open
Abstract
ATP-binding cassette A3 (ABCA3) is a phospholipid carrier that is mainly expressed in the alveolar epithelium. Biallelic mutations of ABCA3 has been associated with fatal respiratory distress syndrome and interstitial lung disease (ILD) in children. However, whether variations in ABCA3 have a role in the development of adult ILD, including idiopathic pulmonary fibrosis (IPF), remains to be addressed. In this study, we screened for germline variants of ABCA3 by exons-sequencing in 30 patients with sporadic IPF and in 30 matched healthy controls. Eleven missense variants, predominantly in heterozygous, were found in 13 of these patients, but only two missenses in 2 healthy controls. We then selected four of the detected missense variants (p.L39V, p.S828F, p.V968M and p.G1205R) to performed cohort analysis in 1,024 ILD patients, containing 250 IPF and 774 connective tissue disease-ILD (CTD-ILD) patients, and 1,054 healthy individuals. Our results showed that the allele frequency of p.G1205R, but not p.L39V, was significantly higher in ILD patients than in healthy controls. However, no additional subject carrying the variant p.S828F or p.V968M was detected in the cohort analysis. These results indicate that the heterozygous ABCA3 gene variants may contribute to susceptibility to diseases in the Chinese population.
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Affiliation(s)
- Wei Zhou
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Yi Zhuang
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Department of Respirology, Medical School Affiliated Drum Tower Hospital, Nanjing University, Nanjing, China
| | - Jiapeng Sun
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Xiaofen Wang
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Qingya Zhao
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Lizhi Xu
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China
| | - Yaping Wang
- Department of Medical Genetics, Nanjing University School of Medicine, Nanjing, China.
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, Jiangsu, China.
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163
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Qian H, Zhao X, Cao P, Lei J, Yan N, Gong X. Structure of the Human Lipid Exporter ABCA1. Cell 2017; 169:1228-1239.e10. [DOI: 10.1016/j.cell.2017.05.020] [Citation(s) in RCA: 179] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/01/2017] [Accepted: 05/12/2017] [Indexed: 01/10/2023]
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164
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Clinical utility gene card for: Tangier disease. Eur J Hum Genet 2017; 25:ejhg201772. [PMID: 28537273 PMCID: PMC5520081 DOI: 10.1038/ejhg.2017.72] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/30/2017] [Accepted: 04/05/2017] [Indexed: 11/22/2022] Open
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165
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Wang D, Tosevska A, Heiß EH, Ladurner A, Mölzer C, Wallner M, Bulmer A, Wagner KH, Dirsch VM, Atanasov AG. Bilirubin Decreases Macrophage Cholesterol Efflux and ATP-Binding Cassette Transporter A1 Protein Expression. J Am Heart Assoc 2017; 6:JAHA.117.005520. [PMID: 28455345 PMCID: PMC5524097 DOI: 10.1161/jaha.117.005520] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
BACKGROUND Mild but chronically elevated circulating unconjugated bilirubin is associated with reduced total and low-density lipoprotein cholesterol concentration, which is associated with reduced cardiovascular disease risk. We aimed to investigate whether unconjugated bilirubin influences macrophage cholesterol efflux, as a potential mechanism for the altered circulating lipoprotein concentrations observed in hyperbilirubinemic individuals. METHODS AND RESULTS Cholesterol efflux from THP-1 macrophages was assessed using plasma obtained from normo- and hyperbilirubinemic (Gilbert syndrome) humans (n=60 per group) or (heterozygote/homozygote Gunn) rats (n=20 per group) as an acceptor. Hyperbilirubinemic plasma from patients with Gilbert syndrome and Gunn rats induced significantly reduced cholesterol efflux compared with normobilirubinemic plasma. Unconjugated bilirubin (3-17.1 μmol/L) exogenously added to plasma- or apolipoprotein A1-supplemented media also decreased macrophage cholesterol efflux in a concentration- and time-dependent manner. We also showed reduced protein expression of the ATP-binding cassette transporter A1 (ABCA1), a transmembrane cholesterol transporter involved in apolipoprotein A1-mediated cholesterol efflux, in THP-1 macrophages treated with unconjugated bilirubin and in peripheral blood mononuclear cells obtained from hyperbilirubinemic individuals. Furthermore, we demonstrated that bilirubin accelerates the degradation rate of the ABCA1 protein in THP-1 macrophages. CONCLUSIONS Cholesterol efflux from THP-1 macrophages is decreased in the presence of plasma obtained from humans and rats with mild hyperbilirubinemia. A direct effect of unconjugated bilirubin on cholesterol efflux was demonstrated and is associated with decreased ABCA1 protein expression. These data improve our knowledge concerning bilirubin's impact on cholesterol transport and represent an important advancement in our understanding of bilirubin's role in cardiovascular disease.
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Affiliation(s)
- Dongdong Wang
- Department of Pharmacognosy, University of Vienna, Austria.,Institute of Genetics and Animal Breeding of the Polish Academy of Sciences, Jastrzebiec, Poland
| | - Anela Tosevska
- Research Platform Active Ageing, University of Vienna, Austria.,Department of Nutritional Sciences, University of Vienna, Austria.,Department of Molecular, Cell and Developmental Biology, UCLA, Los Angeles, CA
| | - Elke H Heiß
- Department of Pharmacognosy, University of Vienna, Austria
| | | | - Christine Mölzer
- Department of Nutritional Sciences, University of Vienna, Austria.,School of Medicine, Medical Sciences and Nutrition, Institute of Medical Sciences, University of Aberdeen, United Kingdom
| | - Marlies Wallner
- Department of Nutritional Sciences, University of Vienna, Austria.,Institute of Dietetics and Nutrition, University of Applied Sciences FH JOANNEUM, Graz, Austria
| | - Andrew Bulmer
- School of Medical Science and Menzies Health Institute Queensland, Gold Coast, Australia
| | - Karl-Heinz Wagner
- Research Platform Active Ageing, University of Vienna, Austria.,Department of Nutritional Sciences, University of Vienna, Austria
| | | | - Atanas G Atanasov
- Department of Pharmacognosy, University of Vienna, Austria .,Institute of Genetics and Animal Breeding of the Polish Academy of Sciences, Jastrzebiec, Poland
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166
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Tsujita M, Hossain MA, Lu R, Tsuboi T, Okumura-Noji K, Yokoyama S. Exposure to High Glucose Concentration Decreases Cell Surface ABCA1 and HDL Biogenesis in Hepatocytes. J Atheroscler Thromb 2017; 24:1132-1149. [PMID: 28428480 PMCID: PMC5684479 DOI: 10.5551/jat.39156] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Aim: To study atherosclerosis risk in diabetes, we investigated ATP-binding cassette transporter A1 (ABCA1) expression and high-density lipoprotein (HDL) biogenesis in the liver and hepatocytes under hyperglycemic conditions. Methods and Results: In streptozotocin-induced diabetic mice, plasma HDL decreased while ABCA1 protein increased without changing its mRNA in the liver, only in the animals that responded to the treatment to show hypoinsulinemia and fasting hyperglycemia but not in the poor responders not showing those. To study the mechanism for this finding, hepatocytes were isolated from the control and diabetic mice, and they showed no difference in expression of ABCA1 protein, its mRNA, and HDL biogenesis in 1 g/l d-glucose but showed decreased HDL biogenesis in 4.5 g/l d-glucose although ABCA1 protein increased without change in its mRNA. Similar findings were confirmed in HepG2 cells with d-glucose but not with l-glucose. Thus, these cell models reproduced the in vivo findings in hyperglycemia. Labeling of cell surface protein revealed that surface ABCA1 decreased in high concentration of d-glucose in HepG2 cells despite the increase of cellular ABCA1 while not with l-glucose. Immunostaining of ABCA1 in HepG2 cells demonstrated the decrease of surface ABCA1 but increase of intracellular ABCA1 with high d-glucose. Clearance of ABCA1 was retarded both in primary hepatocytes and HepG2 cells exposed to high d-glucose but not to l-glucose, being consistent with the decrease of surface ABCA1. Conclusions: It is suggested that localization of ABCA1 to the cell surface is decreased in hepatocytes in hyperglycemic condition to cause decrease of HDL biogenesis.
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Affiliation(s)
- Maki Tsujita
- Biochemistry, Nagoya City University Graduate School of Medical Sciences
| | | | - Rui Lu
- Nutritional Health Science Research Center, Chubu University
| | - Tomoe Tsuboi
- Nutritional Health Science Research Center, Chubu University
| | | | - Shinji Yokoyama
- Nutritional Health Science Research Center, Chubu University
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167
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Pabst T, Kortz L, Fiedler GM, Ceglarek U, Idle JR, Beyoğlu D. The plasma lipidome in acute myeloid leukemia at diagnosis in relation to clinical disease features. BBA CLINICAL 2017; 7:105-114. [PMID: 28331812 PMCID: PMC5357680 DOI: 10.1016/j.bbacli.2017.03.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 03/04/2017] [Accepted: 03/04/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND Early studies established that certain lipids were lower in acute myeloid leukemia (AML) cells than normal leukocytes. Because lipids are now known to play an important role in cell signaling and regulation of homeostasis, and are often perturbed in malignancies, we undertook a comprehensive lipidomic survey of plasma from AML patients at time of diagnosis and also healthy blood donors. METHODS Plasma lipid profiles were measured using three mass spectrometry platforms in 20 AML patients and 20 healthy blood donors. Data were collected on total cholesterol and fatty acids, fatty acid amides, glycerolipids, phospholipids, sphingolipids, cholesterol esters, coenzyme Q10 and eicosanoids. RESULTS We observed a depletion of plasma total fatty acids and cholesterol, but an increase in certain free fatty acids with the observed decline in sphingolipids, phosphocholines, triglycerides and cholesterol esters probably driven by enhanced fatty acid oxidation in AML cells. Arachidonic acid and precursors were elevated in AML, particularly in patients with high bone marrow (BM) or peripheral blasts and unfavorable prognostic risk. PGF2α was also elevated, in patients with low BM or peripheral blasts and with a favorable prognostic risk. A broad panoply of lipid classes is altered in AML plasma, pointing to disturbances of several lipid metabolic interconversions, in particular in relation to blast cell counts and prognostic risk. CONCLUSIONS These data indicate potential roles played by lipids in AML heterogeneity and disease outcome. GENERAL SIGNIFICANCE Enhanced catabolism of several lipid classes increases prognostic risk while plasma PGF2α may be a marker for reduced prognostic risk in AML.
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Key Words
- 12-HEPE, 12-hydroxy-5Z,8Z,10E,14Z,17Z-eicosapentaenoic acid
- 12-LOX, 12-lipoxygenase
- 2HG, (R)-2-hydroxyglutarate
- 2OG, 2-oxoglutarate
- 8,9-DHET, 8,9-dihydroxy-5Z,11Z,14Z-eicosatrienoic acid
- AA, arachidonic acid
- ALL, acute lymphoblastic leukemia
- AML, acute myeloid leukemia
- Acute myeloid leukemia
- Blast cell number
- CE, cholesterol ester
- CML, chronic myelogenous leukemia
- CPT1a, carnitine palmitate transferase 1a
- Cer, ceramide
- CoQ10, coenzyme Q10
- DG, diacylglycerol
- DGLA, dihomo-γ-linoleic acid
- DIC, disseminated intravascular coagulation
- EPA, eicosapentaenoic acid (20:5;5Z,8Z,11Z,14Z,17Z)
- ESI-, electrospray ionization negative mode
- ESI +, electrospray ionization positive mode
- Eicosanoids
- FAA, fatty acid amide
- FAB, French-American-British classification
- FAME, fatty acid methyl ester
- FAO, fatty acid oxidation
- FLC-QqLIT-MS, fast liquid chromatography-quadrupole linear ion-trap mass spectrometry
- Fatty acids
- GCMS, gas chromatography–mass spectrometry
- LPC, lysophosphatidylcholine
- LPE, lysophosphatidylethanolamine
- Lipidomics
- MG, monoacylglycerol
- MRM, multiple reactions monitoring
- MUFA, monounsaturated fatty acid
- OPLS-DA, orthogonal PLS-DA
- PC, phosphatidylcholine
- PCA, principal components analysis
- PE, phosphatidylethanolamine
- PGE2, prostaglandin E2
- PGF1α, prostaglandin 1α
- PGF2α, prostaglandin F2α
- PGH2, prostaglandin H2
- PLS-DA, projection to latent structures-discriminant analysis
- POEA, palmitoleoyl ethanolamide
- PUFA, polyunsaturated fatty acid
- Prognostic risk
- SCD1, stearoyl CoA desaturase 1
- SM, sphingomyelin
- TG, triacylglycerol (triglyceride)
- TxA2, thromboxane A2
- TxB2, thromboxane B2
- UPLC-ESI-QTOFMS, ultraperformance liquid chromatography-electrospray ionization-quadrupole time-of-flight mass spectrometry
- mPGES-1, microsomal prostaglandin E synthase-1
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Affiliation(s)
- Thomas Pabst
- Department of Medical Oncology, Inselspital Bern, Switzerland
| | - Linda Kortz
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Hospital Leipzig, Germany
| | - Georg M Fiedler
- Institute of Clinical Chemistry, Inselspital Bern, Switzerland
| | - Uta Ceglarek
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University Hospital Leipzig, Germany
| | - Jeffrey R Idle
- Hepatology Research Group, Department of Clinical Research, University of Bern, Switzerland
| | - Diren Beyoğlu
- Hepatology Research Group, Department of Clinical Research, University of Bern, Switzerland
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168
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Yamanashi Y, Takada T, Kurauchi R, Tanaka Y, Komine T, Suzuki H. Transporters for the Intestinal Absorption of Cholesterol, Vitamin E, and Vitamin K. J Atheroscler Thromb 2017; 24:347-359. [PMID: 28100881 PMCID: PMC5392472 DOI: 10.5551/jat.rv16007] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Humans cannot synthesize fat-soluble vitamins such as vitamin E and vitamin K. For this reason, they must be obtained from the diet via intestinal absorption. As the deficiency or excess of these vitamins has been reported to cause several types of diseases and disorders in humans, the intestinal absorption of these nutrients must be properly regulated to ensure good health. However, the mechanism of their intestinal absorption remains poorly understood. Recent studies on cholesterol using genome-edited mice, genome-wide association approaches, gene mutation analyses, and the development of cholesterol absorption inhibitors have revealed that several membrane proteins play crucial roles in the intestinal absorption of cholesterol. Surprisingly, detailed analyses of these cholesterol transporters have revealed that they can also transport vitamin E and vitamin K, providing clues to uncover the molecular mechanisms underlying the intestinal absorption of these fat-soluble vitamins. In this review, we focus on the membrane proteins (Niemann-Pick C1 like 1, scavenger receptor class B type I, cluster of differentiation 36, and ATP-binding cassette transporter A1) that are (potentially) involved in the intestinal absorption of cholesterol, vitamin E, and vitamin K and discuss their physiological and pharmacological importance. We also discuss the related uncertainties that need to be explored in future studies.
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Affiliation(s)
- Yoshihide Yamanashi
- Department of Pharmacy, the University of Tokyo Hospital, Faculty of Medicine, the University of Tokyo
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169
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van der Krieken SE, Popeijus HE, Konings M, Dullens SP, Mensink RP, Plat J. C/EBP-β Is Differentially Affected by PPARα Agonists Fenofibric Acid and GW7647, But Does Not Change Apolipoprotein A-I Production During ER-Stress and Inflammation. J Cell Biochem 2016; 118:754-763. [DOI: 10.1002/jcb.25731] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 09/09/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Sophie E. van der Krieken
- Department of Human Biology; NUTRIM School of Nutrition and Translational Research in Metabolism; Maastricht University; P.O. Box 616; Maastricht 6200 MD The Netherlands
| | - Herman E. Popeijus
- Department of Human Biology; NUTRIM School of Nutrition and Translational Research in Metabolism; Maastricht University; P.O. Box 616; Maastricht 6200 MD The Netherlands
| | - Maurice Konings
- Department of Human Biology; NUTRIM School of Nutrition and Translational Research in Metabolism; Maastricht University; P.O. Box 616; Maastricht 6200 MD The Netherlands
| | - Stefan P.J. Dullens
- Department of Human Biology; NUTRIM School of Nutrition and Translational Research in Metabolism; Maastricht University; P.O. Box 616; Maastricht 6200 MD The Netherlands
| | - Ronald P. Mensink
- Department of Human Biology; NUTRIM School of Nutrition and Translational Research in Metabolism; Maastricht University; P.O. Box 616; Maastricht 6200 MD The Netherlands
| | - Jogchum Plat
- Department of Human Biology; NUTRIM School of Nutrition and Translational Research in Metabolism; Maastricht University; P.O. Box 616; Maastricht 6200 MD The Netherlands
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170
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Cui X, Chopp M, Zhang Z, Li R, Zacharek A, Landschoot-Ward J, Venkat P, Chen J. ABCA1/ApoE/HDL Pathway Mediates GW3965-Induced Neurorestoration After Stroke. Stroke 2016; 48:459-467. [PMID: 28028143 DOI: 10.1161/strokeaha.116.015592] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 11/09/2016] [Accepted: 11/23/2016] [Indexed: 12/16/2022]
Abstract
BACKGROUND AND PURPOSE ATP-binding cassette transporter A1 (ABCA1) is a major reverse cholesterol transporter and plays critical role in the formation of brain high-density lipoprotein (HDL) cholesterol. Apolipoprotein E (ApoE) is the most abundant apolipoprotein and transports cholesterol into cells in brain. ABCA1 and ApoE are upregulated by liver-X receptors. Activation of liver-X receptors has neurorestorative benefit for stroke. The current study investigates whether ABCA1/ApoE/HDL pathway mediates GW3965, a synthetic dual liver-X receptor agonist, induced neurorestoration after stroke. METHODS Middle-aged male specific brain ABCA1-deficient (ABCA1-B/-B) and floxed-control (ABCA1fl/fl) mice were subjected to distal middle-cerebral artery occlusion (dMCAo) and gavaged with saline or GW3965 (10 mg/kg) or intracerebral infusion of artificial cerebrospinal fluid or human plasma HDL3 in ABCA1-B/-B stroke mice, starting 24 hours after dMCAo and daily until euthanization 14 days after dMCAo. RESULTS No differences in the blood level of total cholesterol and triglyceride and lesion volume were found among the groups. Compared with ABCA1fl/fl ischemic mice, ABCA1-B/-B ischemic mice exhibited impairment functional outcome and decreased ABCA1/ApoE expression and decreased gray/white matter densities in the ischemic boundary zone 14 days after dMCAo. GW3965 treatment of ABCA1fl/fl ischemic mice led to increased brain ABCA1/ApoE expression, concomitantly to increased blood HDL, gray/white matter densities and oligodendrocyte progenitor cell numbers in the ischemic boundary zone, as well as improved functional outcome 14 days after dMCAo. GW3965 treatment had negligible beneficial effects in ABCA1-B/-B ischemic mice. However, intracerebral infusion of human plasma HDL3 significantly attenuated ABCA1-B/-B-induced deficits. In vitro, GW3965 treatment (5 μM) increased ABCA1/synaptophysin level and neurite/axonal outgrowth in primary cortical neurons derived from ABCA1fl/fl embryos, but not in neurons derived from ABCA1-B/-B embryos. HDL treatment (80 μg/mL) attenuated the reduction of neurite/axonal outgrowth in neurons derived from ABCA1-B/-B embryos. CONCLUSIONS ABCA1/ApoE/HDL pathway, at least partially, contributes to GW3965-induced neurorestoration after stroke.
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Affiliation(s)
- Xu Cui
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.).
| | - Michael Chopp
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.)
| | - Zhenggang Zhang
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.)
| | - Rongwen Li
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.)
| | - Alex Zacharek
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.)
| | - Julie Landschoot-Ward
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.)
| | - Poornima Venkat
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.)
| | - Jieli Chen
- From the Department of Neurology, Henry Ford Health System, Detroit, MI (X.C., M.C., Z.Z., R.L., A.Z., J.L.-W., P.V., J.C.); and Department of Physics, Oakland University, Rochester, MI (M.C.)
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171
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Katsube A, Hayashi H, Kusuhara H. Pim-1L Protects Cell Surface–Resident ABCA1 From Lysosomal Degradation in Hepatocytes and Thereby Regulates Plasma High-Density Lipoprotein Level. Arterioscler Thromb Vasc Biol 2016; 36:2304-2314. [DOI: 10.1161/atvbaha.116.308472] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 10/05/2016] [Indexed: 01/13/2023]
Abstract
Objective—
ATP-binding cassette transporter A1 (ABCA1) exerts an atheroprotective action through the biogenesis of high-density lipoprotein in hepatocytes and prevents the formation of foam cells from macrophages. Controlling ABCA1 is a rational approach to improving atherosclerotic cardiovascular disease. Although much is known about the regulatory mechanism of ABCA1 synthesis, the molecular mechanism underpinning its degradation remains to be clearly described.
Approach and Results—
ABCA1 possesses potential sites of phosphorylation by serine/threonine-protein kinase Pim-1 (Pim-1). Pim-1 depletion decreased the expression of cell surface–resident ABCA1 (csABCA1) and apolipoprotein A-I–mediated [
3
H]cholesterol efflux in the human hepatoma cell line HepG2, but not in peritoneal macrophages from mice. In vitro kinase assay, immunoprecipitation, and immunocytochemistry suggested phosphorylation of csABCA1 by the long form of Pim-1 (Pim-1L). Cell surface biotinylation indicated that Pim-1L inhibited lysosomal degradation of csABCA1 involving the liver X receptor β, which interacts with csABCA1 and thereby protects it from ubiquitination and subsequent lysosomal degradation. Cell surface coimmunoprecipitation with COS-1 cells expressing extracellularly hemagglutinin-tagged ABCA1 showed that Pim-1L–mediated phosphorylation of csABCA1 facilitated the interaction between csABCA1 and liver X receptor β and thereby stabilized the csABCA1–Pim-1L complex. Mice deficient in Pim-1 kinase activity showed lower expression of ABCA1 in liver plasma membranes and lower plasma high-density lipoprotein levels than control mice.
Conclusions—
Pim-1L protects hepatic csABCA1 from lysosomal degradation by facilitating the physical interaction between csABCA1 and liver X receptor β and subsequent stabilization of the csABCA1–Pim-1L complex and thereby regulates the circulating level of high-density lipoprotein. Our findings may aid the development of high-density lipoprotein–targeted therapy.
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Affiliation(s)
- Akira Katsube
- From the Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Japan
| | - Hisamitsu Hayashi
- From the Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Japan
| | - Hiroyuki Kusuhara
- From the Laboratory of Molecular Pharmacokinetics, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Japan
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172
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Cochran BJ, Hou L, Manavalan APC, Moore BM, Tabet F, Sultana A, Cuesta Torres L, Tang S, Shrestha S, Senanayake P, Patel M, Ryder WJ, Bongers A, Maraninchi M, Wasinger VC, Westerterp M, Tall AR, Barter PJ, Rye KA. Impact of Perturbed Pancreatic β-Cell Cholesterol Homeostasis on Adipose Tissue and Skeletal Muscle Metabolism. Diabetes 2016; 65:3610-3620. [PMID: 27702832 PMCID: PMC5132410 DOI: 10.2337/db16-0668] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2016] [Accepted: 09/23/2016] [Indexed: 12/30/2022]
Abstract
Elevated pancreatic β-cell cholesterol levels impair insulin secretion and reduce plasma insulin levels. This study establishes that low plasma insulin levels have a detrimental effect on two major insulin target tissues: adipose tissue and skeletal muscle. Mice with increased β-cell cholesterol levels were generated by conditional deletion of the ATP-binding cassette transporters, ABCA1 and ABCG1, in β-cells (β-DKO mice). Insulin secretion was impaired in these mice under basal and high-glucose conditions, and glucose disposal was shifted from skeletal muscle to adipose tissue. The β-DKO mice also had increased body fat and adipose tissue macrophage content, elevated plasma interleukin-6 and MCP-1 levels, and decreased skeletal muscle mass. They were not, however, insulin resistant. The adipose tissue expansion and reduced skeletal muscle mass, but not the systemic inflammation or increased adipose tissue macrophage content, were reversed when plasma insulin levels were normalized by insulin supplementation. These studies identify a mechanism by which perturbation of β-cell cholesterol homeostasis and impaired insulin secretion increase adiposity, reduce skeletal muscle mass, and cause systemic inflammation. They further identify β-cell dysfunction as a potential therapeutic target in people at increased risk of developing type 2 diabetes.
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Affiliation(s)
- Blake J Cochran
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Liming Hou
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Anil Paul Chirackal Manavalan
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Benjamin M Moore
- Division of Medicine, Royal Prince Alfred Hospital, Sydney, Australia
| | - Fatiha Tabet
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Afroza Sultana
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Luisa Cuesta Torres
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Shudi Tang
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Sudichhya Shrestha
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Praween Senanayake
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Mili Patel
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - William J Ryder
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
| | - Andre Bongers
- Biological Resource Imaging Laboratory, Mark Wainwright Analytical Centre, University of New South Wales Australia, Sydney, Australia
| | - Marie Maraninchi
- Aix-Marseille Université, UMR_S1062, UMR_A1260, Nutrition, Obésité et Risque Thrombotique, Marseille, France
| | - Valerie C Wasinger
- Bioanalytical Mass Spectrometry Facility, Mark Wainwright Analytical Centre, University of New South Wales Australia, Sydney, Australia
| | - Marit Westerterp
- Division of Molecular Medicine, Department of Medicine, Columbia University, New York, NY
| | - Alan R Tall
- Division of Molecular Medicine, Department of Medicine, Columbia University, New York, NY
| | - Philip J Barter
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
- Faculty of Medicine, University of Sydney, Sydney, Australia
| | - Kerry-Anne Rye
- Lipid Research Group, School of Medical Sciences, Faculty of Medicine, University of New South Wales Australia, Sydney, Australia
- Faculty of Medicine, University of Sydney, Sydney, Australia
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173
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Oda MN. Lipid-free apoA-I structure - Origins of model diversity. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1862:221-233. [PMID: 27890580 DOI: 10.1016/j.bbalip.2016.11.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 10/20/2016] [Accepted: 11/20/2016] [Indexed: 01/22/2023]
Abstract
Apolipoprotein A-I (apoA-I) is a prominent member of the exchangeable apolipoprotein class of proteins, capable of transitioning between lipid-bound and lipid-free states. It is the primary structural and functional protein of high density lipoprotein (HDL). Lipid-free apoA-I is critical to de novo HDL formation as it is the preferred substrate of the lipid transporter, ATP Binding Cassette Transporter A1 (ABCA1) Remaley et al. (2001) [1]. Lipid-free apoA-I is an important element in reverse cholesterol transport and comprehension of its structure is a core issue in our understanding of cholesterol metabolism. However, lipid-free apoA-I is highly conformationally dynamic making it a challenging subject for structural analysis. Over the past 20years there have been significant advances in overcoming the dynamic nature of lipid-free apoA-I, which have resulted in a multitude of proposed conformational models.
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Affiliation(s)
- Michael N Oda
- Children's Hospital Oakland Research Institute, Oakland, CA 94609, United States.
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174
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Ceccanti M, Cambieri C, Frasca V, Onesti E, Biasiotta A, Giordano C, Bruno SM, Testino G, Lucarelli M, Arca M, Inghilleri M. A Novel Mutation in ABCA1 Gene Causing Tangier Disease in an Italian Family with Uncommon Neurological Presentation. Front Neurol 2016; 7:185. [PMID: 27853448 PMCID: PMC5089975 DOI: 10.3389/fneur.2016.00185] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 10/11/2016] [Indexed: 02/02/2023] Open
Abstract
Tangier disease is an autosomal recessive disorder characterized by severe reduction in high-density lipoprotein cholesterol and peripheral lipid storage. We describe a family with c.5094C > A p.Tyr1698* mutation in the ABCA1 gene, clinically characterized by syringomyelic-like anesthesia, demyelinating multineuropathy, and reduction in intraepidermal small fibers innervation. In the proband patient, cardiac involvement determined a myocardial infarction; lipid storage was demonstrated in gut, cornea, and aortic wall. The reported ABCA1 mutation has never been described before in a Tangier family.
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Affiliation(s)
- Marco Ceccanti
- Department of Neurology and Psychiatry, Sapienza University , Rome , Italy
| | - Chiara Cambieri
- Department of Radiological, Oncological and Anatomo-Pathological Sciences, Sapienza University , Rome , Italy
| | - Vittorio Frasca
- Department of Neurology and Psychiatry, Sapienza University , Rome , Italy
| | - Emanuela Onesti
- Department of Neurology and Psychiatry, Sapienza University , Rome , Italy
| | - Antonella Biasiotta
- Department of Radiological, Oncological and Anatomo-Pathological Sciences, Sapienza University , Rome , Italy
| | - Carla Giordano
- Department of Radiological, Oncological and Anatomo-Pathological Sciences, Sapienza University , Rome , Italy
| | - Sabina M Bruno
- Department of Cellular Biotechnologies and Hematology, Sapienza University , Rome , Italy
| | - Giancarlo Testino
- Department of Cellular Biotechnologies and Hematology, Sapienza University , Rome , Italy
| | - Marco Lucarelli
- Department of Cellular Biotechnologies and Hematology, Sapienza University, Rome, Italy; Pasteur Institute, Cenci Bolognetti Foundation, Sapienza University, Rome, Italy
| | - Marcello Arca
- Department of Internal Medicine and Medical Specialties, Sapienza University , Rome , Italy
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175
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Joshi AA, Vaidya SS, St-Pierre MV, Mikheev AM, Desino KE, Nyandege AN, Audus KL, Unadkat JD, Gerk PM. Placental ABC Transporters: Biological Impact and Pharmaceutical Significance. Pharm Res 2016; 33:2847-2878. [PMID: 27644937 DOI: 10.1007/s11095-016-2028-8] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 08/23/2016] [Indexed: 01/02/2023]
Abstract
The human placenta fulfills a variety of essential functions during prenatal life. Several ABC transporters are expressed in the human placenta, where they play a role in the transport of endogenous compounds and may protect the fetus from exogenous compounds such as therapeutic agents, drugs of abuse, and other xenobiotics. To date, considerable progress has been made toward understanding ABC transporters in the placenta. Recent studies on the expression and functional activities are discussed. This review discusses the placental expression and functional roles of several members of ABC transporter subfamilies B, C, and G including MDR1/P-glycoprotein, the MRPs, and BCRP, respectively. Since placental ABC transporters modulate fetal exposure to various compounds, an understanding of their functional and regulatory mechanisms will lead to more optimal medication use when necessary in pregnancy.
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Affiliation(s)
- Anand A Joshi
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA
| | - Soniya S Vaidya
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA
- Novartis Institutes of Biomedical Research, Cambridge, Massachusetts, USA
| | - Marie V St-Pierre
- Department of Clinical Pharmacology and Toxicology, University of Zurich Hospital, Zurich, Switzerland
| | - Andrei M Mikheev
- Department of Pharmaceutics, University of Washington School of Pharmacy, Seattle, Washington, USA
- Department of Neurosurgery, Institute of Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, Washington, 98109, USA
| | - Kelly E Desino
- Department of Pharmaceutical Chemistry, University of Kansas School of Pharmacy, Lawrence, Kansas, USA
- Abbvie Inc, North Chicago, Illinois, USA
| | - Abner N Nyandege
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA
| | - Kenneth L Audus
- Department of Pharmaceutical Chemistry, University of Kansas School of Pharmacy, Lawrence, Kansas, USA
| | - Jashvant D Unadkat
- Department of Pharmaceutics, University of Washington School of Pharmacy, Seattle, Washington, USA
| | - Phillip M Gerk
- Department of Pharmaceutics, Virginia Commonwealth University School of Pharmacy, Richmond, Virginia, 23298-0533, USA.
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176
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Kaneko T, Kanno C, Ichikawa-Tomikawa N, Kashiwagi K, Yaginuma N, Ohkoshi C, Tanaka M, Sugino T, Imura T, Hasegawa H, Chiba H. Liver X receptor reduces proliferation of human oral cancer cells by promoting cholesterol efflux via up-regulation of ABCA1 expression. Oncotarget 2016; 6:33345-57. [PMID: 26452260 PMCID: PMC4741770 DOI: 10.18632/oncotarget.5428] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 09/18/2015] [Indexed: 11/25/2022] Open
Abstract
Liver X receptors (LXRs) contribute not only to maintain cholesterol homeostasis but also to control cell growth. However, the molecular mechanisms behind the LXR-mediated anti-proliferative effects are largely unknown. Here we show, by immunohistochemistry, that LXRα and LXRβ are differentially distributed in oral stratified squamous epithelia. By immunohistochemical and Western blot analyses, we also reveal that LXRα is abundantly expressed in human oral squamous cell carcinoma (HOSCC) tissues and cell lines. Cell counting, BrdU labeling and cell cycle assay indicated that LXR stimulation led to significant reduction of proliferation in HOSCC cells. Importantly, our study highlights, by using RNA interference, that the ATP-binding cassette transporter A1 (ABCA1)-accelerated cholesterol efflux is critical for the growth inhibitory action of LXRs in HOSCC cells. Moreover, we demonstrate that LXR activation reduces the growth of xenograft tumour of HOSCC cells in mice accompanied by the upregulation of ABCA1 expression and the decline of cholesterol levels in the tumour. These findings strongly suggested that targeting the LXR-regulated cholesterol transport, yielding in lowering intracellular cholesterol levels, could be a promising therapeutic option for certain types of cancers.
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Affiliation(s)
- Tetsuharu Kaneko
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan.,Division of Dentistry and Oral Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Chihiro Kanno
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan.,Division of Dentistry and Oral Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Naoki Ichikawa-Tomikawa
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Korehito Kashiwagi
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Nanae Yaginuma
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Chihiro Ohkoshi
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Mizuko Tanaka
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Takashi Sugino
- Department of Diagnostic Pathology, Shizuoka Cancer Center, Shizuoka, Japan
| | - Tetsuya Imura
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Hiroshi Hasegawa
- Division of Dentistry and Oral Surgery, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Hideki Chiba
- Department of Basic Pathology, Fukushima Medical University School of Medicine, Fukushima, Japan
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177
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Caveolin-1 facilitates internalization and degradation of ABCA1 and probucol oxidative products interfere with this reaction to increase HDL biogenesis. Atherosclerosis 2016; 253:54-60. [PMID: 27579791 DOI: 10.1016/j.atherosclerosis.2016.08.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 08/01/2016] [Accepted: 08/23/2016] [Indexed: 11/21/2022]
Abstract
BACKGROUND AND AIMS Expression of ATP binding cassette transporter (ABC) A1, a key membrane protein for biogenesis of high-density lipoprotein (HDL), is regulated not only by its gene transcription but also by its intracellular degradation to modulate plasma HDL concentration. We previously showed that inhibition of ABCA1 degradation by probucol oxidative products, spiroquinone (SQ) and diphenoquinone (DQ), increased HDL biogenesis and reverse cholesterol transport, and achieved reduction of atherosclerosis in animal models. The background mechanism has thus been investigated. METHODS Involvement of caveolin-1, a protein of multiple functions in cell biology, particularly in cholesterol trafficking, has been examined for its roles in ABCA1 degradation as well as the effects of SQ and DQ on the reaction. RESULTS ABCA1 protein was increased in caveolin-1-deficient mouse embryonic fibroblasts, not by increase of transcription but by decrease in its internalization and degradation. Transfection and expression of caveolin-1 normalized the protein level and the rate of degradation of ABCA1. Immunoprecipitation experiments demonstrated association between ABCA1 and caveolin-1 and SQ and DQ disrupted this interaction. The effects of SQ and DQ to increase ABCA1 and cell cholesterol release induced by apolipoprotein A-I were dependent on expression of caveolin-1. Fluorescence imaging of ABCA1 and caveolin-1 in cultured cells demonstrated their co-localization as well as its disruption by SQ and DQ, being consistent with the biochemical findings. CONCLUSIONS Caveolin-1 enhances internalization and degradation of ABCA1 by its association with ABCA1. Interference of this interaction by probucol oxidative products suppresses ABCA1 degradation and increase HDL biogenesis.
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178
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Abstract
Lipid abnormalities in type 2 diabetes are characterised by high triglyceride concentrations, low high density lipoprotein-cholesterol concentrations, and normal total and low density lipoprotein-cholesterol (LDL-c) concentrations. LDL particles, however, are small and dense. Epidemiological evidence for these lipid abnormalities, and for the associations between lipid abnormalities and the increased risk of cardiovascular disease in type 2 diabetes, are presented. Most, of the lipid abnormalities in type 2 diabetes can be explained by reduced action of insulin at the tissue level. The biochemical and metabolic mechanisms underlying the lipid abnormalities are discussed.
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Affiliation(s)
- Jonathan Valabhji
- Department of Endocrinology and Metabolic Medicine, Imperial College School of Medicine, 1st Floor Mint Wing, St Marys Hospital, Praed Street, London, W2 1NY, UK,
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179
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Ryu HM, Kim YJ, Oh EJ, Oh SH, Choi JY, Cho JH, Kim CD, Park SH, Kim YL. Hypoxanthine induces cholesterol accumulation and incites atherosclerosis in apolipoprotein E-deficient mice and cells. J Cell Mol Med 2016; 20:2160-2172. [PMID: 27396856 PMCID: PMC5082407 DOI: 10.1111/jcmm.12916] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Accepted: 05/27/2016] [Indexed: 01/19/2023] Open
Abstract
Reactive oxygen species (ROS) generation during purine metabolism is associated with xanthine oxidase and uric acid. However, the direct effect of hypoxanthine on ROS generation and atherosclerosis has not been evaluated. Smoking and heavy drinking are associated with elevated levels of hypoxanthine. In this study, we investigated the role of hypoxanthine on cholesterol synthesis and atherosclerosis development, particularly in apolipoprotein E (APOE)‐deficient mice. The effect of hypoxanthine on the regulation of cholesterol synthesis and atherosclerosis were evaluated in Apoe knockout (KO) mice and cultured HepG2 cells. Hypoxanthine markedly increased serum cholesterol levels and the atherosclerotic plaque area in ApoeKO mice. In HepG2 cells, hypoxanthine increased intracellular ROS production. Hypoxanthine increased cholesterol accumulation and decreased APOE and ATP‐binding cassette transporter A1 (ABCA1) mRNA and protein expression in HepG2 cells. Furthermore, H2O2 also increased cholesterol accumulation and decreased APOE and ABCA1 expression. This effect was partially reversible by treatment with the antioxidant N‐acetyl cysteine and allopurinol. Hypoxanthine and APOE knockdown using APOE‐siRNA synergistically induced cholesterol accumulation and reduced APOE and ABCA1 expression. Hypoxanthine induces cholesterol accumulation in hepatic cells through alterations in enzymes that control lipid transport and induces atherosclerosis in APOE‐deficient cells and mice. These effects are partially mediated through ROS produced in response to hypoxanthine.
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Affiliation(s)
- Hye-Myung Ryu
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.,Cell and Matrix Research Institute, Kyungpook National University, Daegu, Korea
| | - You-Jin Kim
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.,BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, Korea.,Cell and Matrix Research Institute, Kyungpook National University, Daegu, Korea
| | - Eun-Joo Oh
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.,Cell and Matrix Research Institute, Kyungpook National University, Daegu, Korea
| | - Se-Hyun Oh
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.,BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, Korea.,Cell and Matrix Research Institute, Kyungpook National University, Daegu, Korea
| | - Ji-Young Choi
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - Jang-Hee Cho
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - Chan-Duck Kim
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.,Cell and Matrix Research Institute, Kyungpook National University, Daegu, Korea
| | - Sun-Hee Park
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.,Cell and Matrix Research Institute, Kyungpook National University, Daegu, Korea
| | - Yong-Lim Kim
- Division of Nephrology and Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea. .,BK21 Plus KNU Biomedical Convergence Program, Department of Biomedical Science, Kyungpook National University, Daegu, Korea. .,Cell and Matrix Research Institute, Kyungpook National University, Daegu, Korea.
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180
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Gordon SM, Li H, Zhu X, Tso P, Reardon CA, Shah AS, Lu LJ, Davidson WS. Impact of genetic deletion of platform apolipoproteins on the size distribution of the murine lipoproteome. J Proteomics 2016; 146:184-94. [PMID: 27385375 DOI: 10.1016/j.jprot.2016.06.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 05/01/2016] [Accepted: 06/29/2016] [Indexed: 01/16/2023]
Abstract
UNLABELLED Given their association with cardiovascular disease protection, there has been intense interest in understanding the biology of high density lipoproteins (HDL). HDL is actually a family of diverse particle types, each made up of discrete - but as yet undetermined - combinations of proteins drawn from up to 95 lipophilic plasma proteins. The abundant apolipoproteins (apo) of the A class (apoA-I, apoA-II and apoA-IV) have been proposed to act as organizing platforms for auxiliary proteins, but this concept has not been systematically evaluated. We assessed the impact of genetic knock down of each platform protein on the particle size distribution of auxiliary HDL proteins. Loss of apoA-I or apoA-II massively reduced HDL lipids and changed the plasma size pattern and/or abundance of several plasma proteins. Surprisingly though, many HDL proteins were not affected, suggesting they assemble on lipid particles in the absence of apoA-I or apoA-II. In contrast, apoA-IV ablation had minor effects on plasma lipids and proteins, suggesting that it forms particles that largely exclude other apolipoproteins. Overall, the data indicate that distinct HDL subpopulations exist that do not contain, nor depend on, apoA-I, apoA-II or apoA-IV and these contribute substantially to the proteomic diversity of HDL. BIOLOGICAL SIGNIFICANCE Plasma levels of high density lipoproteins (HDL) are inversely correlated with cardiovascular disease. These particles are becoming known as highly heterogeneous entities that have diverse compositions and functions that may impact disease. Unfortunately, we know little about the forces that maintain the composition of each particle in plasma. It has been suggested that certain 'scaffold' proteins, such as apolipoprotein (apo) A-I, apoA-II and apoA-IV, may act as organizing centers for the docking of myriad accessory proteins. To test this hypothesis, we took advantage of the genetic tractability of the mouse model and ablated these three proteins individually. We then tracked the abundance and size profile of the remaining HDL proteins by gel filtration chromatography combined with mass spectrometry. The results clearly show that certain cohorts of proteins depend on each scaffold molecule to assemble normal sized HDL particles under wild-type conditions. This work forms the basis for more detailed studies that will define the specific compositions of HDL subspecies with the possibility of connecting them to specific functions or roles in disease.
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Affiliation(s)
- Scott M Gordon
- Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, 2120 East Galbraith Road, Cincinnati, OH 45237-0507, USA.
| | - Hailong Li
- Division of Biomedical Informatics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7024, Cincinnati, OH 45229-3039, USA.
| | - Xiaoting Zhu
- Division of Biomedical Informatics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7024, Cincinnati, OH 45229-3039, USA.
| | - Patrick Tso
- Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, 2120 East Galbraith Road, Cincinnati, OH 45237-0507, USA.
| | | | - Amy S Shah
- Department of Pediatrics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7012, Cincinnati, OH 45229-3039, USA.
| | - L Jason Lu
- Division of Biomedical Informatics, Cincinnati Children's Hospital Research Foundation, 3333 Burnet Avenue, MLC 7024, Cincinnati, OH 45229-3039, USA.
| | - W Sean Davidson
- Center for Lipid and Arteriosclerosis Science, Department of Pathology and Laboratory Medicine, University of Cincinnati, 2120 East Galbraith Road, Cincinnati, OH 45237-0507, USA.
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181
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Frixel S, Lotz-Havla AS, Kern S, Kaltenborn E, Wittmann T, Gersting SW, Muntau AC, Zarbock R, Griese M. Homooligomerization of ABCA3 and its functional significance. Int J Mol Med 2016; 38:558-66. [PMID: 27352740 DOI: 10.3892/ijmm.2016.2650] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 05/11/2016] [Indexed: 11/06/2022] Open
Abstract
ABCA3 is a surfactant lipid transporter in the limiting membrane of lamellar bodies in alveolar type II cells. Mutations in the ATP-binding cassette, sub-family A (ABC1), member 3 (ABCA3) gene cause respiratory distress syndrome in newborns, and chronic interstitial lung disease in children and adults. ABCA3 belongs to the class of full ABC transporters, which are supposed to be functional in their monomeric forms. Although other family members e.g., ABCA1 and ABCC7 have been shown to function as oligomers, the oligomerization state of ABCA3 is unknown. In the present study, the oligomerization of ABCA3 was investigated in cell lysates and crude membrane preparations from transiently and stably transfected 293 cells using blue native PAGE (BN-PAGE), gel filtration and co-immunoprecipitation. Additionally, homooligomerization was examined in vivo in cells using bioluminescence resonance energy transfer (BRET). Using BN-PAGE and gel filtration, we demonstrate that non-denatured ABCA3 exists in different oligomeric forms, with monomers (45%) and tetramers (30%) being the most abundant forms. Furthermore, we also show the existence of 20% dimers and 5% trimers. BRET analyses verified intermolecular interactions in vivo. Our results also demonstrated that the arrest of ABCA3 in the endoplasmic reticulum (ER), either through drug treatment or induced by mutations in ABCA3, inhibited the propensity of the protein to form dimers. Based on our results, we suggest that transporter oligomerization is crucial for ABCA3 function and that a disruption of oligomerization due to mutations represents a novel pathomechanism in ABCA3-associated lung disease.
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Affiliation(s)
- Sabrina Frixel
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Amelie S Lotz-Havla
- Department of Molecular Pediatrics, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Sunčana Kern
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Eva Kaltenborn
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Thomas Wittmann
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Søren W Gersting
- Department of Molecular Pediatrics, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Ania C Muntau
- University Children's Hospital, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany
| | - Ralf Zarbock
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
| | - Matthias Griese
- German Centre for Lung Research, Dr von Hauner Children's Hospital, Ludwig-Maximilians University, D-80337 Munich, Germany
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182
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Louwe MC, Lammers B, Frias MA, Foks AC, de Leeuw LR, Hildebrand RB, Kuiper J, Smit JWA, Van Berkel TJC, James RW, Geerling JJ, Rensen PCN, Van Eck M. Abca1 deficiency protects the heart against myocardial infarction-induced injury. Atherosclerosis 2016; 251:159-163. [PMID: 27323229 DOI: 10.1016/j.atherosclerosis.2016.06.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 06/08/2016] [Accepted: 06/10/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND AND AIMS We explored the role of ATP-binding cassette transporter A1 (Abca1), in post-myocardial infarction (MI) cardiac injury. METHODS In Abca1(-/-) mice, wild type (WT) mice, and WT mice transplanted with Abca1(-/-) or WT bone marrow, an MI was induced in vivo. Furthermore, an ex vivo MI was induced in isolated Abca1(-/-) and WT hearts. RESULTS Twenty-four hours and two weeks after in vivo MI induction, MI size was reduced in Abca1(-/-) (-58%, p = 0.007; -59%, p = 0.03) compared to WT. Ex vivo MI induction showed no effect of Abca1(-/-) on infarct size. Interestingly, two weeks after MI, Abca1(-/-) mice showed higher circulating levels of B-cells (+3.0 fold, p = 0.02) and T-cells (+4.2 fold, p = 0.002) compared to WT. Bone marrow-specific Abca1(-/-) tended to reduce infarct size (-43%, p = 0.12), suggesting a detrimental role for hematopoietic Abca1 after MI. CONCLUSIONS Although Abca1 has a protective role in atherosclerosis, it exerts detrimental effects on cardiac function after MI.
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Affiliation(s)
- Mieke C Louwe
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Bart Lammers
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands
| | - Miguel A Frias
- Department of Internal Medicine, Endocrinology, Diabetology and Nutrition, University of Geneva, Geneva, Switzerland
| | - Amanda C Foks
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands
| | - Lidewij R de Leeuw
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands
| | - Reeni B Hildebrand
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands
| | - Johan Kuiper
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands
| | - Johannes W A Smit
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands
| | - Theo J C Van Berkel
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands
| | - Richard W James
- Department of Internal Medicine, Endocrinology, Diabetology and Nutrition, University of Geneva, Geneva, Switzerland
| | - Janine J Geerling
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands
| | - Patrick C N Rensen
- Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands; Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Miranda Van Eck
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Gorlaeus Laboratories, Leiden University, Leiden, The Netherlands.
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183
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Hanson RL, Leti F, Tsinajinnie D, Kobes S, Puppala S, Curran JE, Almasy L, Lehman DM, Blangero J, Duggirala R, DiStefano JK. The Arg59Trp variant in ANGPTL8 (betatrophin) is associated with total and HDL-cholesterol in American Indians and Mexican Americans and differentially affects cleavage of ANGPTL3. Mol Genet Metab 2016; 118:128-37. [PMID: 27117576 PMCID: PMC4880492 DOI: 10.1016/j.ymgme.2016.04.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 04/15/2016] [Accepted: 04/15/2016] [Indexed: 11/19/2022]
Abstract
We previously identified a locus linked to total cholesterol (TC) concentration in Pima Indians on chromosome 19p. To characterize this locus, we genotyped >2000 SNPs in 1838 Pimas and assessed association with log(TC). We observed evidence for association with log(TC) with rs2278426 (3.5% decrease/copy of the T allele; P=5.045×10(-6)) in the ANGPTL8 (angiopoietin-like 8) gene. We replicated this association in 2413 participants of the San Antonio Mexican American Family Study (SAMAFS: 2.0% decrease per copy of the T allele; P=0.005842). In a meta-analysis of the combined data, we found the strongest estimated effect with rs2278426 (P=2.563×10(-7)). The variant T allele at rs2278426 predicts an Arg59Trp substitution and has previously been associated with LDL-C and HDL-C. In Pimas and SAMAFS participants, the T allele of rs2278426 was associated with reduced HDL-C levels (P=0.000741 and 0.00002, respectively), and the combined estimated effect for the two cohorts was -3.8% (P=8.526×10(-8)). ANGPTL8 transcript and protein levels increased in response to both glucose and insulin. The variant allele was associated with increased levels of cleaved ANGPTL3. We conclude that individuals with the variant allele may have lower TC and HDL-C levels due to increased activation of ANGPTL3 by ANGPTL8.
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MESH Headings
- Adult
- Alleles
- Amino Acid Substitution
- Angiopoietin-Like Protein 3
- Angiopoietin-Like Protein 8
- Angiopoietin-like Proteins/genetics
- Angiopoietin-like Proteins/metabolism
- Arginine/genetics
- Blood Glucose/metabolism
- Cholesterol, HDL/blood
- Cholesterol, HDL/genetics
- Cholesterol, HDL/metabolism
- Cholesterol, LDL/blood
- Cholesterol, LDL/genetics
- Cholesterol, LDL/metabolism
- Chromosomes, Human, Pair 19/genetics
- Cohort Studies
- Coronary Disease/blood
- Coronary Disease/genetics
- Diabetes Mellitus/genetics
- Female
- Genome-Wide Association Study
- Hep G2 Cells
- Humans
- Indians, North American/genetics
- Insulin/metabolism
- Male
- Mexican Americans/genetics
- Middle Aged
- Peptide Hormones/genetics
- Peptide Hormones/metabolism
- Polymorphism, Single Nucleotide
- Tryptophan/genetics
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Affiliation(s)
- Robert L Hanson
- Diabetes Epidemiology and Clinical Research Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 1550 East Indian School Road, Phoenix, AZ 85014, United States
| | - Fatjon Leti
- Center for Genes, Environment, and Health, Department of Biomedical Research, National Jewish Health, 1400 Jackson Street, Denver, CO 80206, United States
| | - Darwin Tsinajinnie
- Diabetes, Cardiovascular and Metabolic Diseases Division, Translational Genomics Research Institute, 445 Fifth Street, Phoenix, AZ 85004, United States
| | - Sayuko Kobes
- Diabetes Epidemiology and Clinical Research Section, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, 1550 East Indian School Road, Phoenix, AZ 85014, United States
| | - Sobha Puppala
- South Texas Diabetes and Obesity Institute (STDOI), University of Texas Rio Grande Valley (UTRGV) School of Medicine, 2700 E. Jackson St. Brownsville, TX 78520; 1214 W. Schunior Street, Edinburgh, TX 78541; 3463 Magic Drive San Antonio, TX 78229, United States
| | - Joanne E Curran
- South Texas Diabetes and Obesity Institute (STDOI), University of Texas Rio Grande Valley (UTRGV) School of Medicine, 2700 E. Jackson St. Brownsville, TX 78520; 1214 W. Schunior Street, Edinburgh, TX 78541; 3463 Magic Drive San Antonio, TX 78229, United States
| | - Laura Almasy
- South Texas Diabetes and Obesity Institute (STDOI), University of Texas Rio Grande Valley (UTRGV) School of Medicine, 2700 E. Jackson St. Brownsville, TX 78520; 1214 W. Schunior Street, Edinburgh, TX 78541; 3463 Magic Drive San Antonio, TX 78229, United States
| | - Donna M Lehman
- Departments of Medicine and Cellular & Structural Biology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, TX 78229, United States
| | - John Blangero
- South Texas Diabetes and Obesity Institute (STDOI), University of Texas Rio Grande Valley (UTRGV) School of Medicine, 2700 E. Jackson St. Brownsville, TX 78520; 1214 W. Schunior Street, Edinburgh, TX 78541; 3463 Magic Drive San Antonio, TX 78229, United States
| | - Ravindranath Duggirala
- South Texas Diabetes and Obesity Institute (STDOI), University of Texas Rio Grande Valley (UTRGV) School of Medicine, 2700 E. Jackson St. Brownsville, TX 78520; 1214 W. Schunior Street, Edinburgh, TX 78541; 3463 Magic Drive San Antonio, TX 78229, United States
| | - Johanna K DiStefano
- Center for Genes, Environment, and Health, Department of Biomedical Research, National Jewish Health, 1400 Jackson Street, Denver, CO 80206, United States; Diabetes, Cardiovascular and Metabolic Diseases Division, Translational Genomics Research Institute, 445 Fifth Street, Phoenix, AZ 85004, United States.
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184
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Fletcher JI, Williams RT, Henderson MJ, Norris MD, Haber M. ABC transporters as mediators of drug resistance and contributors to cancer cell biology. Drug Resist Updat 2016; 26:1-9. [PMID: 27180306 DOI: 10.1016/j.drup.2016.03.001] [Citation(s) in RCA: 286] [Impact Index Per Article: 35.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 03/04/2016] [Accepted: 03/12/2016] [Indexed: 12/12/2022]
Affiliation(s)
- Jamie I Fletcher
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, Randwick, NSW, Australia
| | - Rebekka T Williams
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, Randwick, NSW, Australia
| | - Michelle J Henderson
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, Randwick, NSW, Australia
| | - Murray D Norris
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, Randwick, NSW, Australia
| | - Michelle Haber
- Children's Cancer Institute Australia, Lowy Cancer Research Centre, Randwick, NSW, Australia.
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185
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Li X, Cao X, Zhang X, Kang Y, Zhang W, Yu M, Ma C, Han J, Duan Y, Chen Y. MEK1/2 inhibitors induce interleukin-5 expression in mouse macrophages and lymphocytes. Biochem Biophys Res Commun 2016; 473:939-946. [PMID: 27045084 DOI: 10.1016/j.bbrc.2016.03.156] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 03/31/2016] [Indexed: 01/27/2023]
Abstract
Uptake of oxidized low-density lipoprotein (oxLDL) by macrophages facilitates the formation of foam cells, the prominent part of atherosclerotic lesions. Interleukin-5 (IL-5) is a cytokine regulating interactions between immune cells. It also activates the production of T15/EO6 IgM antibodies in B-1 cells, which can bind oxLDL thereby demonstrating anti-atherogenic properties. We previously reported that inhibition of extracellular signal-regulated kinases 1 and 2 (ERK1/2) by mitogen-activated protein kinase kinases 1/2 (MEK1/2) inhibitors can reduce atherosclerosis. In this study, we determined the effects of MEK1/2 inhibitors on IL-5 production both in vitro and in vivo. In vitro, MEK1/2 inhibitors (PD98059 and U0126) substantially inhibited phosphorylation of MEK1/2 and ERK1/2. Associated with inhibition of ERK1/2 phosphorylation both in vitro and in vivo, MEK1/2 inhibitors induced IL-5 protein expression in macrophages (RAW macrophages and peritoneal macrophages) and lymphocytes (EL-4 cells). In vivo, administration of mice with MEK1/2 inhibitors increased serum IL-5 levels, and IL-5 protein expression in mouse spleen and liver. At the mechanistic level, we determined that MEK1/2 inhibitors activated IL-5 mRNA expression and IL-5 promoter activity in the liver X receptor (LXR) dependent manner indicating the induction of IL-5 transcription. In addition, we determined that MEK1/2 inhibitors enhanced IL-5 protein stability. Taken together, our study demonstrates that MEK1/2 inhibitors induce IL-5 production which suggests another anti-atherogenic mechanism of MEK1/2 inhibitors.
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Affiliation(s)
- Xiaoju Li
- College of Life Sciences, Nankai University, Tianjin, China
| | - Xingyue Cao
- College of Life Sciences, Nankai University, Tianjin, China
| | - Xiaomeng Zhang
- College of Life Sciences, Nankai University, Tianjin, China
| | - Yanhua Kang
- School of Medicine, Hangzhou Normal University, Hangzhou, China
| | - Wenwen Zhang
- College of Life Sciences, Nankai University, Tianjin, China
| | - Miao Yu
- College of Life Sciences, Nankai University, Tianjin, China
| | - Chuanrui Ma
- College of Life Sciences, Nankai University, Tianjin, China
| | - Jihong Han
- College of Medical Engineering, Hefei University of Technology, Hefei, China; College of Life Sciences, Nankai University, Tianjin, China
| | - Yajun Duan
- College of Medical Engineering, Hefei University of Technology, Hefei, China; College of Life Sciences, Nankai University, Tianjin, China.
| | - Yuanli Chen
- College of Medical Engineering, Hefei University of Technology, Hefei, China; School of Medicine, Nankai University, Tianjin, China.
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186
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Abstract
PURPOSE OF REVIEW Novel therapies for severe dyslipidemia target a wide range of unmet medical needs: severe familial hypercholesterolemia, severe hypertriglyceridemia and chylomicronemia, elevated lipoprotein (a), lipodystrophies, high-density lipoprotein particle diseases, lysosomal acid lipase deficiency and storage diseases, nonalcoholic fatty liver disease and others. The purpose of this review is to describe the contribution of human genetics to the development of therapeutic approaches targeting severe dyslipidemia. RECENT FINDINGS Recent advances in human genetics and the identification of rare genetic variants having strong effects on disease risk not only accelerated the development of therapies for severe dyslipidemia, they also revealed new pathways, genes and mechanisms of health, disease or drug response, and facilitated molecular diagnosis, which may prove essential as the authorized use of some of these novel drugs is limited to specific conditions. In addition, the dissection of the gene and cell machinery gave rise to new technologies, gene-based therapies and biodrugs covering a broad range of novel agents currently available or in clinical development to treat severe lipid disorders. SUMMARY Several novel therapies are recently available or under development to treat severe dyslipidemia and associated risk stem directly from genetic research. Altogether, these therapies target a broad variety of severe dyslipidemia pathways or mechanisms and illustrate that clinical lipidology has now entered the era of precision medicine.
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Affiliation(s)
- Daniel Gaudet
- Department of Medicine, Lipidology Unit, Community Genomic Medicine Center, Université de Montréal and ECOGENE-21 Clinical and Translational Research Center, Chicoutimi, Quebec, Canada
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187
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Jeff JM, Peloso GM, Do R. What can we learn about lipoprotein metabolism and coronary heart disease from studying rare variants? Curr Opin Lipidol 2016; 27:99-104. [PMID: 26844526 PMCID: PMC4819247 DOI: 10.1097/mol.0000000000000277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
PURPOSE OF REVIEW Rare variant association studies (RVAS) target the class of genetic variation with frequencies less than 1%. Recently, investigators have used exome sequencing in RVAS to identify rare alleles responsible for Mendelian diseases but have experienced greater difficulty discovering such alleles for complex diseases. In this review, we describe what we have learned about lipoprotein metabolism and coronary heart disease through the conduct of RVAS. RECENT FINDINGS Rare protein-altering genetic variation can provide important insights that are not as easily attainable from common variant association studies. First, RVAS can facilitate gene discovery by identifying novel rare protein-altering variants in specific genes that are associated with disease. Second, rare variant associations can provide supportive evidence for putative drug targets for novel therapies. Finally, rare variants can uncover new pathways and reveal new biologic mechanisms. SUMMARY The field of human genetics has already made tremendous progress in understanding lipoprotein metabolism and the causes of coronary heart disease in the context of rare variants. As next generation sequencing becomes more cost-effective, RVAS with larger sample sizes will be conducted. This will lead to more novel rare variant discoveries and the translation of genomic data into biological knowledge and clinical insights for cardiovascular disease.
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Affiliation(s)
- Janina M. Jeff
- Charles F. Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY
| | - Gina M. Peloso
- Center for Human Genetic Research, Massachusetts General Hospital, Boston, MA
| | - Ron Do
- Charles F. Bronfman Institute for Personalized Medicine, Icahn School of Medicine at Mount Sinai, New York, NY
- The Center for Statistical Genetics, Icahn School of Medicine at Mount Sinai, New York, NY
- The Zena and Michael A. Weiner Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY
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188
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Ma W, Lin M, Ding H, Lin G, Zhang Z. β-COP as a Component of Transport Vesicles for HDL Apolipoprotein-Mediated Cholesterol Exocytosis. PLoS One 2016; 11:e0151767. [PMID: 26986486 PMCID: PMC4795675 DOI: 10.1371/journal.pone.0151767] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 03/03/2016] [Indexed: 12/27/2022] Open
Abstract
Objective HDL and its apolipoproteins protect against atherosclerotic disease partly by removing excess cholesterol from macrophage foam cells. But the underlying mechanisms of cholesterol clearance are still not well defined. We investigated roles of vesicle trafficking of coatomer β-COP in delivering cholesterol to the cell surface during apoA-1 and apoE-mediated lipid efflux from fibroblasts and THP-1 macrophages. Methods shRNA knockout, confocal and electron microscopy and biochemical analysis were used to investigate the roles of β-COP in apolipoprotein-mediated cholesterol efflux in fibroblasts and THP-1 macrophages. Results We showed that β-COP knockdown by lentiviral shRNA resulted in reduced apoA-1-mediated cholesterol efflux, while increased cholesterol accumulation and formation of larger vesicles were observed in THP-1 macrophages by laser scanning confocal microscopy. Immunogold electron microscopy showed that β-COP appeared on the membrane protrusion complexes and colocalized with apoA-1 or apoE during cholesterol efflux. This was associated with releasing heterogeneous sizes of small particles into the culture media of THP-1 macrophage. Western blotting also showed that apoA-1 promotes β-COP translocation to the cell membrane and secretion into culture media, in which a total of 17 proteins were identified by proteomics. Moreover, β-COP exclusively associated with human plasma HDL fractions. Conclusion ApoA-1 and apoE promoted transport vesicles consisting of β-COP and other candidate proteins to exocytose cholesterol, forming the protrusion complexes on cell surface, which were then released from the cell membrane as small particles to media.
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Affiliation(s)
- Weilie Ma
- Department of Biochemistry and Molecular Biology, Key Laboratory of Medical Molecular Diagnostics of Guangdong Province, Guangdong Medical University, Dongguan, Guangdong, 523808, China
| | - Margarita Lin
- Department of Biochemistry and Molecular Biology, Key Laboratory of Medical Molecular Diagnostics of Guangdong Province, Guangdong Medical University, Dongguan, Guangdong, 523808, China
| | - Hang Ding
- Department of Biochemistry and Molecular Biology, Key Laboratory of Medical Molecular Diagnostics of Guangdong Province, Guangdong Medical University, Dongguan, Guangdong, 523808, China
| | - Guorong Lin
- Department of Biochemistry and Molecular Biology, Key Laboratory of Medical Molecular Diagnostics of Guangdong Province, Guangdong Medical University, Dongguan, Guangdong, 523808, China
- * E-mail: (GL); (ZZ)
| | - Zhizhen Zhang
- Department of Biochemistry and Molecular Biology, Key Laboratory of Medical Molecular Diagnostics of Guangdong Province, Guangdong Medical University, Dongguan, Guangdong, 523808, China
- * E-mail: (GL); (ZZ)
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189
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Tang C, Houston BA, Storey C, LeBoeuf RC. Both STAT3 activation and cholesterol efflux contribute to the anti-inflammatory effect of apoA-I/ABCA1 interaction in macrophages. J Lipid Res 2016; 57:848-57. [PMID: 26989082 DOI: 10.1194/jlr.m065797] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Indexed: 12/13/2022] Open
Abstract
ABCA1 exports excess cholesterol from cells to apoA-I and is essential for HDL synthesis. Genetic studies have shown that ABCA1 protects against cardiovascular disease. We have previously shown that the interaction of apoA-I with ABCA1 activates signaling molecule Janus kinase 2 (JAK2), which optimizes the cholesterol efflux activity of ABCA1. ABCA1-mediated activation of JAK2 also activates signal transducer and activator of transcription 3 (STAT3), which significantly attenuates proinflammatory cytokine expression in macrophages. To determine the mechanisms of the anti-inflammatory effects of apoA-I/ABCA1 interaction, we identified two special ABCA1 mutants, one with normal STAT3-activating capacity but lacking cholesterol efflux ability and the other with normal cholesterol efflux ability but lacking STAT3-activating capacity. We showed that activation of STAT3 by the interaction of apoA-I/ABCA1 without cholesterol efflux could significantly decrease proinflammatory cytokine expression in macrophages. Mechanistic studies showed that the anti-inflammatory effect of the apoA-I/ABCA1/STAT3 pathway is suppressor of cytokine signaling 3 dependent. Moreover, we showed that apoA-I/ABCA1-mediated cholesterol efflux without STAT3 activation can also reduce proinflammatory cytokine expression in macrophages. These findings suggest that the interaction of apoA-I/ABCA1 activates cholesterol efflux and STAT3 branch pathways to synergistically suppress inflammation in macrophages.
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Affiliation(s)
- Chongren Tang
- Division of Metabolism, Endocrinology and Nutrition, Diabetes Obesity Center for Excellence, University of Washington, Seattle, WA 98109
| | - Barbara A Houston
- Division of Metabolism, Endocrinology and Nutrition, Diabetes Obesity Center for Excellence, University of Washington, Seattle, WA 98109
| | - Carl Storey
- Division of Metabolism, Endocrinology and Nutrition, Diabetes Obesity Center for Excellence, University of Washington, Seattle, WA 98109
| | - Renee C LeBoeuf
- Division of Metabolism, Endocrinology and Nutrition, Diabetes Obesity Center for Excellence, University of Washington, Seattle, WA 98109
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190
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Wahl P, Ducasa GM, Fornoni A. Systemic and renal lipids in kidney disease development and progression. Am J Physiol Renal Physiol 2016; 310:F433-45. [PMID: 26697982 PMCID: PMC4971889 DOI: 10.1152/ajprenal.00375.2015] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 12/22/2015] [Indexed: 12/14/2022] Open
Abstract
Altered lipid metabolism characterizes proteinuria and chronic kidney diseases. While it is thought that dyslipidemia is a consequence of kidney disease, a large body of clinical and experimental studies support that altered lipid metabolism may contribute to the pathogenesis and progression of kidney disease. In fact, accumulation of renal lipids has been observed in several conditions of genetic and nongenetic origins, linking local fat to the pathogenesis of kidney disease. Statins, which target cholesterol synthesis, have not been proven beneficial to slow the progression of chronic kidney disease. Therefore, other therapeutic strategies to reduce cholesterol accumulation in peripheral organs, such as the kidney, warrant further investigation. Recent advances in the understanding of the biology of high-density lipoprotein (HDL) have revealed that functional HDL, rather than total HDL per se, may protect from both cardiovascular and kidney diseases, strongly supporting a role for altered cholesterol efflux in the pathogenesis of kidney disease. Although the underlying pathophysiological mechanisms responsible for lipid-induced renal damage have yet to be uncovered, several studies suggest novel mechanisms by which cholesterol, free fatty acids, and sphingolipids may affect glomerular and tubular cell function. This review will focus on the clinical and experimental evidence supporting a causative role of lipids in the pathogenesis of proteinuria and kidney disease, with a primary focus on podocytes.
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Affiliation(s)
- Patricia Wahl
- Peggy and Harold Katz Family Drug Discovery Center and Division of Nephrology and Hypertension, University of Miami Miller School of Medicine, Miami, Florida
| | - Gloria Michelle Ducasa
- Peggy and Harold Katz Family Drug Discovery Center and Division of Nephrology and Hypertension, University of Miami Miller School of Medicine, Miami, Florida
| | - Alessia Fornoni
- Peggy and Harold Katz Family Drug Discovery Center and Division of Nephrology and Hypertension, University of Miami Miller School of Medicine, Miami, Florida
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191
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Papageorgiou N, Zacharia E, Androulakis E, Briasoulis A, Charakida M, Tousoulis D. HDL as a prognostic biomarker for coronary atherosclerosis: the role of inflammation. Expert Opin Ther Targets 2016; 20:907-21. [PMID: 26854521 DOI: 10.1517/14728222.2016.1152264] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
INTRODUCTION Emerging evidence suggests that the role of high density lipoprotein (HDL) in the atherosclerotic process is not as clear as previously thought, since atheroprotective HDL becomes atherogenic in states of increased inflammatory processes. AREAS COVERED In this review we aim to elucidate the role of HDL as a prognostic biomarker and we discuss therapeutic approaches that aim to increase HDL and their possible clinical benefit. EXPERT OPINION Given the structural variability and biological complexity of the HDL particle, its role in the atherosclerotic process is far from clear. According to current evidence, the atheroprotective role of HDL turns atherogenic in states of increased inflammatory processes, while even minor alterations in systemic inflammation are likely to hinder the endothelial protective effects of HDL. In accordance, significant data have revealed that HDL-related drugs may be effective in reducing cardiovascular mortality; however they are not as encouraging or unanimous as expected. Possible future goals could be to quantify either HDL subclasses or functions in an attempt to reach safer conclusions as to the prognostic importance of HDL in coronary atherosclerosis. Having achieved that, a more targeted therapy that would aim to raise either HDL functionality or to remodel HDL structure would be more easily designed.
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Affiliation(s)
| | - Effimia Zacharia
- b 1st Department of Cardiology , Hippokration Hospital, University of Athens , Athens , Greece
| | | | - Alexandros Briasoulis
- d Division of Cardiology , Wayne State University/Detroit Medical Center , Detroit , MI , USA
| | - Marietta Charakida
- e Vascular Physiology Unit, Institute of Cardiovascular Science , University College London , London , UK
| | - Dimitris Tousoulis
- b 1st Department of Cardiology , Hippokration Hospital, University of Athens , Athens , Greece
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192
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Lhermusier T, Severin S, Van Rothem J, Garcia C, Bertrand-Michel J, Le Faouder P, Hechler B, Broccardo C, Couvert P, Chimini G, Sié P, Payrastre B. ATP-binding cassette transporter 1 (ABCA1) deficiency decreases platelet reactivity and reduces thromboxane A2 production independently of hematopoietic ABCA1. J Thromb Haemost 2016; 14:585-95. [PMID: 26749169 DOI: 10.1111/jth.13247] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Indexed: 02/03/2023]
Abstract
UNLABELLED ESSENTIALS: The role of ATP-binding cassette transporter 1 (ABCA1) in platelet functions is poorly characterized. We studied the impact of ABCA1 deficiency on platelet responses in a mouse model and two Tangier patients. ABCA1-deficient platelets exhibit reduced positive feedback loop mechanisms. This reduced reactivity is dependent on external environment and independent of hematopoietic ABCA1. SUMMARY BACKGROUND The ATP-binding cassette transporter ABCA1 is required for the conversion of apolipoprotein A-1 to high-density lipoprotein (HDL), and its defect causes Tangier disease, a rare disorder characterized by an absence of HDL and accumulation of cholesterol in peripheral tissues. The role of ABCA1 in platelet functions remains poorly characterized. OBJECTIVE To determine the role of ABCA1 in platelet functions and to clarify controversies concerning its implication in processes as fundamental as platelet phosphatidylserine exposure and control of platelet membrane lipid composition. METHODS AND RESULTS We studied the impact of ABCA1 deficiency on platelet responses in a mouse model and in two Tangier patients. We show that platelets in ABCA1-deficient mice are slightly larger in size and exhibit aggregation and secretion defects in response to low concentrations of thrombin and collagen. These platelets have normal cholesterol and major phospholipid composition, granule morphology, or calcium-induced phosphatidylserine exposure. Interestingly, ABCA1-deficient platelets display a reduction in positive feedback loop mechanisms, particularly in thromboxane A2 (TXA2) production. Hematopoietic chimera mice demonstrated that defective eicosanoids production, particularly TXA2, was primarily dependent on external environment and not on the hematopoietic ABCA1. Decreased aggregation and production of TXA2 and eicosanoids were also observed in platelets from Tangier patients. CONCLUSIONS Absence of ABCA1 and low HDL level induce reduction of platelet reactivity by decreasing positive feedback loops, particularly TXA2 production through a hematopoietic ABCA1-independent mechanism.
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Affiliation(s)
- T Lhermusier
- Inserm, U1048 et Université Toulouse 3, I2MC, Toulouse, France
- Département de Cardiologie, CHU de Toulouse, Toulouse, France
| | - S Severin
- Inserm, U1048 et Université Toulouse 3, I2MC, Toulouse, France
| | - J Van Rothem
- Inserm, U1048 et Université Toulouse 3, I2MC, Toulouse, France
- Département de Cardiologie, CHU de Toulouse, Toulouse, France
| | - C Garcia
- Laboratoire d'Hématologie, CHU de Toulouse, Toulouse, France
| | | | - P Le Faouder
- I2MC, Lipidomic Core Facility-MetaToul, Toulouse, France
| | - B Hechler
- Inserm UMR-S949, Etablissement Français du Sang-Alsace, Strasbourg, France
| | | | - P Couvert
- Service de Biochimie Endocrinienne et Oncologique, Hôpital Pitié Salpêtrière, Paris, France
| | - G Chimini
- CIML, Parc Scientifique de Luminy, Case 906, Marseille Luminy, France
| | - P Sié
- Inserm, U1048 et Université Toulouse 3, I2MC, Toulouse, France
- Laboratoire d'Hématologie, CHU de Toulouse, Toulouse, France
| | - B Payrastre
- Inserm, U1048 et Université Toulouse 3, I2MC, Toulouse, France
- Laboratoire d'Hématologie, CHU de Toulouse, Toulouse, France
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Yao MH, He J, Ma RL, Ding YS, Guo H, Yan YZ, Zhang JY, Liu JM, Zhang M, Rui DS, Niu Q, Guo SX. Association between Polymorphisms and Haplotype in the ABCA1 Gene and Overweight/Obesity Patients in the Uyghur Population of China. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:220. [PMID: 26891315 PMCID: PMC4772240 DOI: 10.3390/ijerph13020220] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 01/13/2016] [Accepted: 01/27/2016] [Indexed: 12/20/2022]
Abstract
OBJECTIVE This study aimed to detect the association between polymorphisms and haplotype in the ATP-binding cassette transporter A1 (ABCA1) gene and overweight/obese Uyghur patients in China. METHODS A total of 259 overweight/obese patients and 276 normal weight subjects, which were randomly selected from among 3049 adult Uyghurs, were matched for age. We genotyped ABCA1 single nucleotide polymorphisms of rs2515602, rs3890182, rs2275542, rs2230806, rs1800976, and rs4149313. RESULTS (1) The genotypic and allelic frequencies of rs2515602 and rs4149313 differed between the control group and case group. The genotypic frequency of rs2275542 also differed between the control group and case group (p < 0.05); (2) rs2515602, rs2230806, and rs4149313 polymorphisms were significantly related to risk of overweight/obese; (3) a significant linkage disequilibrium (LD) was observed between the ABCA1 gene rs2275542 with rs3890182 and rs2515602 with rs4149313. (4) the C-C-C-A-G-G, T-C-G-A-G-G, and T-T-G-G-G-A haplotypes were significant in normal weight and overweight/obese subjects (p < 0.05); (5) the levels of HDL-C (rs2515602, rs2275542, rs4149313) in normal weight subjects were different among the genotypes (p < 0.05); the levels of TC, LDL-C and TG (rs1800976) in overweight/obese subjects were different among the genotypes (p < 0.05). CONCLUSIONS The rs2515602, rs4149313, and rs2275542 polymorphisms were associated with overweight/obese conditions among Uyghurs. Strong LD was noted between rs2275542 with rs3890182 and rs2515602 with rs4149313. The C-C-C-A-G-G and T-C-G-A-G-G haplotypes may serve as risk factors of overweight/obesity among Uyghurs. The T-T-G-G-G-A haplotype may serve as a protective factor of overweight/obesity among Uyghurs. Rs2515602, rs2275542, rs4149313, and rs1800976 polymorphisms in the ABCA1 gene may influence lipid profiles.
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Affiliation(s)
- Ming-Hong Yao
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Jia He
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Ru-Lin Ma
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Yu-Song Ding
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Heng Guo
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Yi-Zhong Yan
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Jing-Yu Zhang
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Jia-Ming Liu
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Mei Zhang
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Dong-Shen Rui
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Qiang Niu
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Shu-Xia Guo
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
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Ma Y, Follis JL, Smith CE, Tanaka T, Manichaikul AW, Chu AY, Samieri C, Zhou X, Guan W, Wang L, Biggs ML, Chen YDI, Hernandez DG, Borecki I, Chasman DI, Rich SS, Ferrucci L, Irvin MR, Aslibekyan S, Zhi D, Tiwari HK, Claas SA, Sha J, Kabagambe EK, Lai CQ, Parnell LD, Lee YC, Amouyel P, Lambert JC, Psaty BM, King IB, Mozaffarian D, McKnight B, Bandinelli S, Tsai MY, Ridker PM, Ding J, Mstat KL, Liu Y, Sotoodehnia N, Barberger-Gateau P, Steffen LM, Siscovick DS, Absher D, Arnett DK, Ordovás JM, Lemaitre RN. Interaction of methylation-related genetic variants with circulating fatty acids on plasma lipids: a meta-analysis of 7 studies and methylation analysis of 3 studies in the Cohorts for Heart and Aging Research in Genomic Epidemiology consortium. Am J Clin Nutr 2016; 103:567-78. [PMID: 26791180 PMCID: PMC5260796 DOI: 10.3945/ajcn.115.112987] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 12/08/2015] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND DNA methylation is influenced by diet and single nucleotide polymorphisms (SNPs), and methylation modulates gene expression. OBJECTIVE We aimed to explore whether the gene-by-diet interactions on blood lipids act through DNA methylation. DESIGN We selected 7 SNPs on the basis of predicted relations in fatty acids, methylation, and lipids. We conducted a meta-analysis and a methylation and mediation analysis with the use of data from the CHARGE (Cohorts for Heart and Aging Research in Genomic Epidemiology) consortium and the ENCODE (Encyclopedia of DNA Elements) consortium. RESULTS On the basis of the meta-analysis of 7 cohorts in the CHARGE consortium, higher plasma HDL cholesterol was associated with fewer C alleles at ATP-binding cassette subfamily A member 1 (ABCA1) rs2246293 (β = -0.6 mg/dL, P = 0.015) and higher circulating eicosapentaenoic acid (EPA) (β = 3.87 mg/dL, P = 5.62 × 10(21)). The difference in HDL cholesterol associated with higher circulating EPA was dependent on genotypes at rs2246293, and it was greater for each additional C allele (β = 1.69 mg/dL, P = 0.006). In the GOLDN (Genetics of Lipid Lowering Drugs and Diet Network) study, higher ABCA1 promoter cg14019050 methylation was associated with more C alleles at rs2246293 (β = 8.84%, P = 3.51 × 10(18)) and lower circulating EPA (β = -1.46%, P = 0.009), and the mean difference in methylation of cg14019050 that was associated with higher EPA was smaller with each additional C allele of rs2246293 (β = -2.83%, P = 0.007). Higher ABCA1 cg14019050 methylation was correlated with lower ABCA1 expression (r = -0.61, P = 0.009) in the ENCODE consortium and lower plasma HDL cholesterol in the GOLDN study (r = -0.12, P = 0.0002). An additional mediation analysis was meta-analyzed across the GOLDN study, Cardiovascular Health Study, and the Multi-Ethnic Study of Atherosclerosis. Compared with the model without the adjustment of cg14019050 methylation, the model with such adjustment provided smaller estimates of the mean plasma HDL cholesterol concentration in association with both the rs2246293 C allele and EPA and a smaller difference by rs2246293 genotypes in the EPA-associated HDL cholesterol. However, the differences between 2 nested models were NS (P > 0.05). CONCLUSION We obtained little evidence that the gene-by-fatty acid interactions on blood lipids act through DNA methylation.
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Affiliation(s)
- Yiyi Ma
- Biomedical Genetics, Department of Medicine, Boston University, Boston, MA; Jean Mayer USDA Human Nutrition Research Center on Aging and
| | - Jack L Follis
- Department of Mathematics, Computer Science and Cooperative Engineering, University of St. Thomas, Houston, TX
| | - Caren E Smith
- Jean Mayer USDA Human Nutrition Research Center on Aging and
| | | | - Ani W Manichaikul
- Center for Public Health Genomics, University of Virginia, Charlottesville, VA
| | - Audrey Y Chu
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Cecilia Samieri
- Inserm, U897, University of Bordeaux, Bordeaux, France; University of Bordeaux, ISPED, Bordeaux, France
| | - Xia Zhou
- Divisions of Epidemiology and Community Health and
| | | | - Lu Wang
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Mary L Biggs
- Departments of Biostatistics, Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - Yii-Der I Chen
- Cedars-Sinai Medical Center, Medical Genetics Research Institute, Los Angeles, CA; Los Angeles Biomedical Institute, Harbor-University of California, Los Angeles Medical Center, Torrance, CA
| | - Dena G Hernandez
- Laboratory of Neurogenetics, National Institute on Aging, Bethesda, MD
| | - Ingrid Borecki
- Department of Genetics, Washington University School of Medicine, St. Louis, MO
| | - Daniel I Chasman
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | - Stephen S Rich
- Center for Public Health Genomics, University of Virginia, Charlottesville, VA
| | | | | | | | - Degui Zhi
- Biostatics, University of Alabama at Birmingham, Birmingham, AL
| | - Hemant K Tiwari
- Biostatics, University of Alabama at Birmingham, Birmingham, AL
| | | | - Jin Sha
- Departments of Epidemiology and
| | | | - Chao-Qiang Lai
- Jean Mayer USDA Human Nutrition Research Center on Aging and
| | | | - Yu-Chi Lee
- Jean Mayer USDA Human Nutrition Research Center on Aging and
| | - Philippe Amouyel
- Inserm, UMR1167, Lille, France; University of Lille, Lille, France; Institut Pasteur de Lille, Lille, France; Regional University Hospital of Lille, Lille, France
| | - Jean-Charles Lambert
- Inserm, UMR1167, Lille, France; University of Lille, Lille, France; Institut Pasteur de Lille, Lille, France
| | - Bruce M Psaty
- Epidemiology, Health Services, and Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - Irena B King
- Department of Internal Medicine, University of New Mexico, Albuquerque, NM
| | - Dariush Mozaffarian
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA
| | - Barbara McKnight
- Departments of Biostatistics, Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | | | - Michael Y Tsai
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN
| | - Paul M Ridker
- Brigham and Women's Hospital, Harvard Medical School, Boston, MA
| | | | - Kurt Lohmant Mstat
- Epidemiology & Prevention, Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC
| | - Yongmei Liu
- Epidemiology & Prevention, Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, NC
| | - Nona Sotoodehnia
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - Pascale Barberger-Gateau
- Inserm, U897, University of Bordeaux, Bordeaux, France; University of Bordeaux, ISPED, Bordeaux, France
| | | | | | - Devin Absher
- Hudson Alpha Institute for Biotechnology, Huntsville, AL
| | | | - José M Ordovás
- Jean Mayer USDA Human Nutrition Research Center on Aging and Department of Epidemiology and Population Genetics, Cardiovascular Research Center, Madrid, Spain; and IMDEA Food Institute, Madrid, Spain
| | - Rozenn N Lemaitre
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
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Nuytemans K, Maldonado L, Ali A, John-Williams K, Beecham GW, Martin E, Scott WK, Vance JM. Overlap between Parkinson disease and Alzheimer disease in ABCA7 functional variants. Neurol Genet 2016; 2:e44. [PMID: 27066581 PMCID: PMC4817903 DOI: 10.1212/nxg.0000000000000044] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 11/17/2015] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Given their reported function in phagocytosis and clearance of protein aggregates in Alzheimer disease (AD), we hypothesized that variants in ATP-binding cassette transporter A7 (ABCA7) might be involved in Parkinson disease (PD). METHODS ABCA7 variants were identified using whole-exome sequencing (WES) on 396 unrelated patients with PD and 222 healthy controls. In addition, we used the publicly available WES data from the Parkinson's Progression Markers Initiative (444 patients and 153 healthy controls) as a second, independent data set. RESULTS We observed a higher frequency of loss-of-function (LOF) variants and rare putative highly functional variants (Combined Annotation Dependent Depletion [CADD] >20) in clinically diagnosed patients with PD than in healthy controls in both data sets. Overall, we identified LOF variants in 11 patients and 1 healthy control (odds ratio [OR] 4.94, Fisher exact p = 0.07). Four of these variants have been previously implicated in AD risk (p.E709AfsX86, p.W1214X, p.L1403RfsX7, and rs113809142). In addition, rare variants with CADD >20 were observed in 19 patients vs 3 healthy controls (OR 2.85, Fisher exact p = 0.06). CONCLUSION The presence of ABCA7 LOF variants in clinically defined PD suggests that they might be risk factors for neurodegeneration in general, especially those variants hallmarked by protein aggregation. More studies will be needed to evaluate the overall impact of this transporter in neurodegenerative disease.
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Affiliation(s)
- Karen Nuytemans
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
| | - Lizmarie Maldonado
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
| | - Aleena Ali
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
| | - Krista John-Williams
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
| | - Gary W Beecham
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
| | - Eden Martin
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
| | - William K Scott
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
| | - Jeffery M Vance
- John P. Hussman Institute for Human Genomics and The Morris K. Udall Parkinson Disease Center of Excellence, Miller School of Medicine, University of Miami, FL
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196
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Update on the molecular biology of dyslipidemias. Clin Chim Acta 2016; 454:143-85. [DOI: 10.1016/j.cca.2015.10.033] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 10/24/2015] [Accepted: 10/30/2015] [Indexed: 12/20/2022]
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197
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Yao MH, Guo H, He J, Yan YZ, Ma RL, Ding YS, Zhang JY, Liu JM, Zhang M, Li SG, Xu SZ, Niu Q, Ma JL, Guo SX. Interactions of Six SNPs in ABCA1gene and Obesity in Low HDL-C Disease in Kazakh of China. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:176. [PMID: 26828509 PMCID: PMC4772196 DOI: 10.3390/ijerph13020176] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Revised: 01/19/2016] [Accepted: 01/25/2016] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To detect the interactions between six functional polymorphisms in ABCA1 and obesity in Kazakhs with low HDL-C levels. METHODS A total of 204 patients with low HDL-C and 207 health control subjects, which were randomly selected from among 5692 adult Kazakhs, were matched for age and sex. We genotyped ABCA1 single nucleotide polymorphisms of rs2515602, rs3890182, rs2275542, rs2230806, rs1800976, and rs4149313. RESULTS (1) The genotypic and allelic frequencies of rs2515602, rs2230806 and rs4149313 were different between normal HDL-C and low HDL-C subjects, the genotypic frequency of rs2275542 was also different between normal HDL-C and low HDL-C subjects (p < 0.05); (2) the level of HDL-C (rs2515602 and rs2275542) in normal HDL-C subjects were different among the genotypes (p < 0.05); the levels of TC, LDL-C (rs2515602, rs4149313); TG (rs2515602, rs1800976, rs4149313) in low HDL-C patients were different among the genotypes (p < 0.05); (3) interactions between the rs3890182, rs2275542, rs180096, and rs4149313 polymorphisms in ABCA1 gene and obesity may be associated with low HDL-C disease; (4) the C-C-C-A-A-G, T-C-C-A-A-A, T-C-C-A-A-G, C-C-C-A-A-A, C-T-G-G-A-A, and T-T-C-G-A-A haplotypes were significant between the subjects with normal HDL-C and low HDL-C level (p < 0.05). CONCLUSIONS The differences in serum lipid levels between normal HDL-C and low HDL-C subjects among Kazakhs might partly result from ABCA1 gene polymorphisms; ABCA1 gene polymorphisms may be associated with low HDL-C disease; the low HDL-C disease might partly result from interactions between ABCA1 gene polymorphisms and obesity; the C-C-C-A-A-G, T-C-C-A-A-A, and T-C-C-A-A-G haplotypes may serve as risk factors of low HDL-C disease among Kazakhs, the C-C-C-A-A-A, C-T-G-G-A-A, and T-T-C-G-A-A haplotypes may serve as protective factor of low HDL-C disease among Kazakhs.
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Affiliation(s)
- Ming-hong Yao
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Heng Guo
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Jia He
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Yi-zhong Yan
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Ru-lin Ma
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Yu-song Ding
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Jing-yu Zhang
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Jia-ming Liu
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Mei Zhang
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Shu-gang Li
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Shang-zhi Xu
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Qiang Niu
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Jiao-long Ma
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
| | - Shu-xia Guo
- Department of Public Health and Key Laboratory of Xinjiang Endemic and Ethnic Diseases of the Ministry of Education, Shihezi University School of Medicine, Shihezi 832002, China.
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Gu X, Wu Z, Huang Y, Wagner MA, Baleanu-Gogonea C, Mehl RA, Buffa JA, DiDonato AJ, Hazen LB, Fox PL, Gogonea V, Parks JS, DiDonato JA, Hazen SL. A Systematic Investigation of Structure/Function Requirements for the Apolipoprotein A-I/Lecithin Cholesterol Acyltransferase Interaction Loop of High-density Lipoprotein. J Biol Chem 2016; 291:6386-95. [PMID: 26797122 DOI: 10.1074/jbc.m115.696088] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Indexed: 11/06/2022] Open
Abstract
The interaction of lecithin-cholesterol acyltransferase (LCAT) with apolipoprotein A-I (apoA-I) plays a critical role in high-density lipoprotein (HDL) maturation. We previously identified a highly solvent-exposed apoA-I loop domain (Leu(159)-Leu(170)) in nascent HDL, the so-called "solar flare" (SF) region, and proposed that it serves as an LCAT docking site (Wu, Z., Wagner, M. A., Zheng, L., Parks, J. S., Shy, J. M., 3rd, Smith, J. D., Gogonea, V., and Hazen, S. L. (2007) Nat. Struct. Mol. Biol. 14, 861-868). The stability and role of the SF domain of apoA-I in supporting HDL binding and activation of LCAT are debated. Here we show by site-directed mutagenesis that multiple residues within the SF region (Pro(165), Tyr(166), Ser(167), and Asp(168)) of apoA-I are critical for both LCAT binding to HDL and LCAT catalytic efficiency. The critical role for possible hydrogen bond interaction at apoA-I Tyr(166) was further supported using reconstituted HDL generated from apoA-I mutants (Tyr(166) → Glu or Asn), which showed preservation in both LCAT binding affinity and catalytic efficiency. Moreover, the in vivo functional significance of NO2-Tyr(166)-apoA-I, a specific post-translational modification on apoA-I that is abundant within human atherosclerotic plaque, was further investigated by using the recombinant protein generated from E. coli containing a mutated orthogonal tRNA synthetase/tRNACUA pair enabling site-specific insertion of the unnatural amino acid into apoA-I. NO2-Tyr(166)-apoA-I, after subcutaneous injection into hLCAT(Tg/Tg), apoA-I(-/-) mice, showed impaired LCAT activation in vivo, with significant reduction in HDL cholesteryl ester formation. The present results thus identify multiple structural features within the solvent-exposed SF region of apoA-I of nascent HDL essential for optimal LCAT binding and catalytic efficiency.
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Affiliation(s)
- Xiaodong Gu
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Zhiping Wu
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Ying Huang
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Matthew A Wagner
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | | | - Ryan A Mehl
- the Department of Biochemistry and Biophysics, Oregon State University, Corvallis, Oregon 97331, and
| | - Jennifer A Buffa
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Anthony J DiDonato
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Leah B Hazen
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Paul L Fox
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Valentin Gogonea
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and the Department of Chemistry, Cleveland State University, Cleveland, Ohio 44115
| | - John S Parks
- the Sections on Molecular Medicine, Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina 27157
| | - Joseph A DiDonato
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and
| | - Stanley L Hazen
- From the Department of Cellular and Molecular Medicine, Lerner Research Institute, and the Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, Ohio 44195,
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Rotllan N, Price N, Pati P, Goedeke L, Fernández-Hernando C. microRNAs in lipoprotein metabolism and cardiometabolic disorders. Atherosclerosis 2016; 246:352-60. [PMID: 26828754 DOI: 10.1016/j.atherosclerosis.2016.01.025] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 01/12/2016] [Accepted: 01/15/2016] [Indexed: 12/18/2022]
Abstract
Circulating levels of low-density lipoprotein cholesterol (LDL), and high-density lipoprotein cholesterol (HDL) are two of the most important risk factors for the development of cardiovascular disease (CVD), the leading cause of death worldwide. Recently, miRNAs have emerged as critical regulators of cholesterol metabolism and promising therapeutic targets for the treatment of CVD. A great deal of work has established numerous miRNAs as important regulators of HDL metabolism. This includes miRNAs that target ABCA1, a critical factor for HDL biogenesis and reverse cholesterol transport (RCT), the process through which cells, including arterial macrophages, efflux cellular cholesterol for transport to and removal by the liver. The most well studied of these miRNAs, miR-33, has been demonstrated to target ABCA1, as well as numerous other genes involved in metabolic function and RCT, and therapeutic inhibition of miR-33 was found to increase HDL levels in mice and non-human primates. Moreover, numerous studies have demonstrated the beneficial effects of miR-33 inhibition or knockout on reducing atherosclerotic plaque burden. Even more recent work has identified miRNAs that regulate LDL cholesterol levels, including direct modulation of LDL uptake in the liver through targeting of the LDL receptor. Among these, inhibition of miR-128-1, miR-148a, or miR-185 was found to reduce plasma LDL levels, and inhibition of miR-185 was further demonstrated to reduce atherosclerotic plaque size in ApoE(-/-) mice. Due to their ability to target many different genes, miRNAs have the ability to mediate complex physiologic changes through simultaneous regulation of multiple interrelated pathways. Of particular importance for CVD, inhibition of miR-148a may prove an important therapeutic approach for combating dyslipidemia, as this has been demonstrated to both raise plasma HDL levels and lower LDL levels in mice by targeting both ABCA1 and LDLR, respectively. In this review we highlight recent advances in our understanding of how miRNAs regulate cholesterol metabolism and the development of atherosclerotic plaques and discuss the potential of anti-miRNA therapies for the treatment and prevention of CVD.
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Affiliation(s)
- Noemi Rotllan
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT, USA; Integrative Cell Signaling and Neurobiology of Metabolism Program, Section of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - Nathan Price
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT, USA; Integrative Cell Signaling and Neurobiology of Metabolism Program, Section of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - Paramita Pati
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT, USA; Integrative Cell Signaling and Neurobiology of Metabolism Program, Section of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - Leigh Goedeke
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT, USA; Integrative Cell Signaling and Neurobiology of Metabolism Program, Section of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - Carlos Fernández-Hernando
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT, USA; Integrative Cell Signaling and Neurobiology of Metabolism Program, Section of Comparative Medicine and Department of Pathology, Yale University School of Medicine, New Haven, CT, USA.
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Melchior JT, Walker RG, Morris J, Jones MK, Segrest JP, Lima DB, Carvalho PC, Gozzo FC, Castleberry M, Thompson TB, Davidson WS. An Evaluation of the Crystal Structure of C-terminal Truncated Apolipoprotein A-I in Solution Reveals Structural Dynamics Related to Lipid Binding. J Biol Chem 2016; 291:5439-51. [PMID: 26755744 DOI: 10.1074/jbc.m115.706093] [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: 11/22/2015] [Indexed: 11/06/2022] Open
Abstract
Apolipoprotein (apo) A-I mediates many of the anti-atherogenic functions attributed to high density lipoprotein. Unfortunately, efforts toward a high resolution structure of full-length apoA-I have not been fruitful, although there have been successes with deletion mutants. Recently, a C-terminal truncation (apoA-I(Δ185-243)) was crystallized as a dimer. The structure showed two helical bundles connected by a long, curved pair of swapped helical domains. To compare this structure to that existing under solution conditions, we applied small angle x-ray scattering and isotope-assisted chemical cross-linking to apoA-I(Δ185-243) in its dimeric and monomeric forms. For the dimer, we found evidence for the shared domains and aspects of the N-terminal bundles, but not the molecular curvature seen in the crystal. We also found that the N-terminal bundles equilibrate between open and closed states. Interestingly, this movement is one of the transitions proposed during lipid binding. The monomer was consistent with a model in which the long shared helix doubles back onto the helical bundle. Combined with the crystal structure, these data offer an important starting point to understand the molecular details of high density lipoprotein biogenesis.
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Affiliation(s)
- John T Melchior
- From the Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio 45237
| | - Ryan G Walker
- the Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio 45237
| | - Jamie Morris
- From the Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio 45237
| | - Martin K Jones
- the Department of Medicine and Atherosclerosis Research Unit, University of Alabama at Birmingham, Birmingham, Alabama 35294
| | - Jere P Segrest
- the Department of Medicine and Atherosclerosis Research Unit, University of Alabama at Birmingham, Birmingham, Alabama 35294
| | - Diogo B Lima
- the Laboratory for Proteomics and Protein Engineering, Carlos Chagas Institute, Fiocruz, Paraná, Brazil 81350-010, and
| | - Paulo C Carvalho
- the Laboratory for Proteomics and Protein Engineering, Carlos Chagas Institute, Fiocruz, Paraná, Brazil 81350-010, and
| | - Fábio C Gozzo
- the Dalton Mass Spectrometry Laboratory, University of Campinas, São Paulo 13083-970, Brazil
| | - Mark Castleberry
- the Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio 45237
| | - Thomas B Thompson
- the Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio 45237,
| | - W Sean Davidson
- From the Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio 45237,
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