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Shughoury A, Sevgi DD, Ciulla TA. Molecular Genetic Mechanisms in Age-Related Macular Degeneration. Genes (Basel) 2022; 13:genes13071233. [PMID: 35886016 PMCID: PMC9316037 DOI: 10.3390/genes13071233] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/30/2022] [Accepted: 07/05/2022] [Indexed: 11/29/2022] Open
Abstract
Age-related macular degeneration (AMD) is among the leading causes of irreversible blindness worldwide. In addition to environmental risk factors, such as tobacco use and diet, genetic background has long been established as a major risk factor for the development of AMD. However, our ability to predict disease risk and personalize treatment remains limited by our nascent understanding of the molecular mechanisms underlying AMD pathogenesis. Research into the molecular genetics of AMD over the past two decades has uncovered 52 independent gene variants and 34 independent loci that are implicated in the development of AMD, accounting for over half of the genetic risk. This research has helped delineate at least five major pathways that may be disrupted in the pathogenesis of AMD: the complement system, extracellular matrix remodeling, lipid metabolism, angiogenesis, and oxidative stress response. This review surveys our current understanding of each of these disease mechanisms, in turn, along with their associated pathogenic gene variants. Continued research into the molecular genetics of AMD holds great promise for the development of precision-targeted, personalized therapies that bring us closer to a cure for this debilitating disease.
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Affiliation(s)
- Aumer Shughoury
- Department of Ophthalmology, Eugene and Marilyn Glick Eye Institute, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Duriye Damla Sevgi
- Department of Ophthalmology, Eugene and Marilyn Glick Eye Institute, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Thomas A Ciulla
- Department of Ophthalmology, Eugene and Marilyn Glick Eye Institute, Indiana University School of Medicine, Indianapolis, IN 46202, USA
- Clearside Biomedical, Inc., Alpharetta, GA 30005, USA
- Midwest Eye Institute, Indianapolis, IN 46290, USA
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Yanagi Y, Yu RM, Ahamed W, Yu M, Teo KYC, Tan AC, Cheng CY, Wong TY, Apte RS, Cheung CMG. Serum Cholesterol Efflux Capacity in Age-Related Macular Degeneration and Polypoidal Choroidal Vasculopathy. OPHTHALMOLOGY SCIENCE 2022; 2:100142. [PMID: 36278032 PMCID: PMC9562377 DOI: 10.1016/j.xops.2022.100142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 03/03/2022] [Accepted: 03/07/2022] [Indexed: 12/03/2022]
Abstract
Purpose To investigate serum cholesterol efflux capacity (the ability of the serum to accept cholesterol) and factors that regulate it using nuclear magnetic resonance-quantified measures of lipoprotein particle composition and size and apolipoproteins metrics in patients with age-related macular degeneration (AMD). Design Case-control study. Participants Four hundred two serum samples from 80 patients with early AMD (eAMD), and 212 patients with neovascular AMD (nAMD), including 80 with typical nAMD (tAMD) and 132 with polypoidal choroidal vasculopathy (PCV), and 110 age- and gender matched control participants. Methods Serum from participants showed cholesterol efflux capacity measured using in vitro cell assays and lipoprotein subfractions measured using nuclear magnetic resonance (Nightingale, Ltd). Associations between cholesterol efflux capacity (measured in percentage) and lipid subfractions were investigated in the patients and control participants. Main Outcome Measures Cholesterol efflux capacity and lipid subfractions in control, eAMD, and nAMD. Associations between HDL subfractions and cholesterol efflux capacity. Results Cholesterol efflux capacity was higher in patients with eAMD (68.0 ± 11.3% [mean ± standard deviation]) and nAMD (75.9 ± 27.7%) than in the control participants (56.9 ± 16.7%) after adjusting for age, gender, and use of lipid-lowering drug (P < 0.0001). Nuclear magnetic resonance lipidomics demonstrated that the mean diameter of HDL was larger both in eAMD (9.96 ± 0.27 mm [mean ± standard deviation]) and PCV (9.97 ± 0.23 mm) compared with that of the control participants (9.84 ± 0.24 mm; P = 0.0001 for both). Among the 28 HDL subfractions, most of the small, medium, and large HDLs, but none of the 7 extra large HDLs fractions, were associated moderately with cholesterol efflux capacity in eAMD and PCV (R = 0.149-0.277). Conclusions Serum cholesterol efflux capacity was increased in eAMD and PCV, but not tAMD, possibly reflecting differential underlying pathophysiologic features of lipid dysregulation in tAMD and PCV. Further studies should be directed toward investigating the diverse biological activities of HDL in AMD, including macular pigment transport, regulation of inflammation, and local cholesterol transport system.
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Key Words
- AMD, age-related macular degeneration
- Age-related macular degeneration
- Cholesterol efflux
- Drusen
- HDL, high-density lipoprotein
- LDL, low-density lipoprotein
- Lipoprotein
- NMR, nuclear magnetic resonance
- PCV, polypoidal choroidal vasculopathy
- Polypoidal choroidal vasculopathy
- RPE, retinal pigment epithelium
- RPMI, Roswell Park Memorial Institute
- SCES, Singapore Chinese Eye Study
- SD, standard deviation
- VLDL, very low-density lipoprotein
- eAMD, early age-related macular degeneration
- nAMD, neovascular age-related macular degeneration
- tAMD, typical neovascular age-related macular degeneration
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Affiliation(s)
- Yasuo Yanagi
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore,Academic Clinical Program, Duke-NUS Medical School, National University of Singapore, Singapore, Republic of Singapore,Correspondence: Yasuo Yanagi, Singapore Eye Research Institute, 11 Third Hospital Avenue, 168751, Singapore, Republic of Singapore.
| | - Richard M.C. Yu
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore
| | - Waseem Ahamed
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore
| | - Marco Yu
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore,Academic Clinical Program, Duke-NUS Medical School, National University of Singapore, Singapore, Republic of Singapore
| | - Kelvin Yi Chong Teo
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore,Academic Clinical Program, Duke-NUS Medical School, National University of Singapore, Singapore, Republic of Singapore
| | - Anna C.S. Tan
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore,Academic Clinical Program, Duke-NUS Medical School, National University of Singapore, Singapore, Republic of Singapore
| | - Ching-Yu Cheng
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore,Academic Clinical Program, Duke-NUS Medical School, National University of Singapore, Singapore, Republic of Singapore
| | - Tien Yin Wong
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore,Academic Clinical Program, Duke-NUS Medical School, National University of Singapore, Singapore, Republic of Singapore
| | - Rajendra S. Apte
- Department of Ophthalmology, Washington University School of Medicine, St. Louis, Missouri,Department of Medicine, Washington University School of Medicine, St. Louis, Missouri,Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri
| | - Chui Ming Gemmy Cheung
- Singapore National Eye Centre, Singapore Eye Research Institute, Singapore, Republic of Singapore,Academic Clinical Program, Duke-NUS Medical School, National University of Singapore, Singapore, Republic of Singapore
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Fernández‐Vega B, García M, Olivares L, Álvarez L, González‐Fernández A, Artime E, Fernández‐Vega Cueto A, Cobo T, Coca‐Prados M, Vega JA, González‐Iglesias H. The association study of lipid metabolism gene polymorphisms with AMD identifies a protective role for APOE-E2 allele in the wet form in a Northern Spanish population. Acta Ophthalmol 2020; 98:e282-e291. [PMID: 31654486 DOI: 10.1111/aos.14280] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 09/28/2019] [Indexed: 12/12/2022]
Abstract
PURPOSE To elucidate the potential role of eleven single nucleotide polymorphisms (SNPs) in the most relevant lipid metabolism genes in Northern Spanish patients with age-related macular degeneration (AMD). METHODS A case-control study of 228 unrelated native Northern Spanish patients diagnosed with AMD (73 dry and 155 wet) and 95 healthy controls was performed. DNA was isolated from peripheral blood and genotyped for the SNPs APOE rs429358 and rs7412; CTEP rs3764261; LIPC rs10468017 and rs493258; LPL rs12678919; ABCA1 rs1883025; ABCA4 rs76157638, rs3112831 and rs1800555; and SCARB1 rs5888, using TaqMan probes. An additional association study of ε2, ε3 and ε4 major isoforms of APOE gene with AMD has been carried out. RESULTS The allele and genotype frequencies for each of the eleven sequence variants in the lipid metabolism genes did not show significant differences when comparing AMD cases and controls. Statistical analysis revealed that APOE-ε2 carrier genotypes were less frequently observed in patients with wet AMD compared to controls (5.8% versus 13.7%, respectively: p = 3.28 × 10-2 ; OR = 0.42, 95% CI: 0.19-0.95). The frequency of the allele T of rs10468017 (LIPC gene) was lower in dry AMD cases compared to controls (15.8 versus 27.9%, respectively: p = 8.4 × 10-3 OR = 0.57, 95% CI: 0.33-0.98). CONCLUSIONS Our results suggest a protective role for APOE-ε2 allele to wet AMD in the Northern Spanish population.
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Affiliation(s)
- Beatriz Fernández‐Vega
- Instituto Oftalmológico Fernández‐Vega Oviedo Spain
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
- Departamento de Morfología y Biología Celular Grupo SINPOS Universidad de Oviedo Oviedo Spain
| | - Montserrat García
- Instituto Oftalmológico Fernández‐Vega Oviedo Spain
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
| | - Lorena Olivares
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
| | - Lydia Álvarez
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
| | - Adrián González‐Fernández
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
| | - Enol Artime
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
| | - Andrés Fernández‐Vega Cueto
- Instituto Oftalmológico Fernández‐Vega Oviedo Spain
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
| | - Teresa Cobo
- Departamento de Cirugía y Especialidades Médico‐Quirúrgicas Universidad de Oviedo Oviedo Spain
| | - Miguel Coca‐Prados
- Department of Ophthalmology and Visual Science Yale University School of Medicine New Haven CT USA
| | - José A. Vega
- Departamento de Morfología y Biología Celular Grupo SINPOS Universidad de Oviedo Oviedo Spain
- Facultad de Ciencias de la Salud Universidad Autónoma de Chile Santiago de Chile Chile
| | - Héctor González‐Iglesias
- Instituto Oftalmológico Fernández‐Vega Oviedo Spain
- Instituto Universitario Fernández‐Vega (Fundación de Investigación Oftalmológica, Universidad de Oviedo) Oviedo Spain
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Xu N, Xu H, Zhao M, Xu Y, Huang L. Associations of systemic, serum lipid and lipoprotein metabolic pathway gene variations with polypoidal choroidal vasculopathy in China. PLoS One 2019; 14:e0226763. [PMID: 31877157 PMCID: PMC6932770 DOI: 10.1371/journal.pone.0226763] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 12/03/2019] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND To investigate the association of systemic, serum lipids and genetic variants in the high-density lipoprotein (HDL) metabolic pathway with polypoidal choroidal vasculopathy (PCV) in China. METHODS The case-control study was included 150 controls and 66 cases with PCV. Serum levels of total cholesterol (TC), low-density lipoprotein (LDL), HDL, triglycerides (TG), apolipoprotein A1 (APOA1), apolipoprotein B (APOB) together with systemic risk factors including gender, hyperlipidemia, diabetes mellitus (DM), hypertension, coronary artery disease (CAD) and asthma were identified. All subjects were genotyped for four single nucleotide polymorphisms (SNPs) from three genes in the HDL metabolic pathway: rs10468017 of hepatic lipase (LIPC), rs12678919 of lipoprotein lipase (LPL), rs3764261 and rs173539 of cholesterol ester transfer protein (CETP) with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Student's t-tests, chi-square tests, anova and logistic regression were used to evaluate associations. RESULTS Hyperlipidemia was a risk factor (odds ratio (OR) = 1.19, P = 0.001) for PCV. HDL, LDL and APOB levels were associated with PCV (OR = 0.001, P = 0.004; OR = 0.099, P = 0.010; OR = 0.839, P = 0.018). Higher level of TC was potently associated with increased risk of PCV (OR = 109.8, P = 0.000). LIPC rs10468017 was a risk factor for PCV (OR = 11.68, P = 0.000). CETP rs3764261 conferred a decreased risk for PCV (OR = 0.08, P = 0.000). No associations of LPL rs12678919 or CETP rs173539 with PCV were found. Mean level of HDL increased with T allele of the CETP gene (p = 0.026): 1.24 mmol/L (±0.31) for the GG genotype and 1.66 mmol/L (±0.54) for the TT genotype. Additionally, T allele was associated with the following increase in APOA1: 136.78 mg/dl (±20.53) for the CC genotype and 149.57 mg/dl (±22.67) for the TT genotype of LIPC and 137.91 mg/dl (±20.36) for the GG genotype and 162.67 mg/dl (±22.50) for the TT genotype of CETP gene. CONCLUSION Our study suggested that the significant association was found between hyperlipidemia, the serum levels of TC, HDL, LDL and APOB and PCV. The result of present study also showed that the association of LIPC rs10468017 and CETP rs3764261 with PCV.
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Affiliation(s)
- Ningda Xu
- Department of Ophthalmology, Peking University People’s Hospital Eye Diseases and Optometry Institute, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, College of Optometry, Peking University Health Science Center; Beijing,China
| | - Hui Xu
- Department of Ophthalmology, Peking University People’s Hospital Eye Diseases and Optometry Institute, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, College of Optometry, Peking University Health Science Center; Beijing,China
| | - Mingwei Zhao
- Department of Ophthalmology, Peking University People’s Hospital Eye Diseases and Optometry Institute, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, College of Optometry, Peking University Health Science Center; Beijing,China
| | - Yongsheng Xu
- Department of Ophthalmology, Peking University People’s Hospital Eye Diseases and Optometry Institute, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, College of Optometry, Peking University Health Science Center; Beijing,China
| | - Lvzhen Huang
- Department of Ophthalmology, Peking University People’s Hospital Eye Diseases and Optometry Institute, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, College of Optometry, Peking University Health Science Center; Beijing,China
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5
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Association of Genes in the High-Density Lipoprotein Metabolic Pathway with Polypoidal Choroidal Vasculopathy in Asian Population: A Systematic Review and Meta-Analysis. J Ophthalmol 2018; 2018:9538671. [PMID: 29977615 PMCID: PMC6011074 DOI: 10.1155/2018/9538671] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2017] [Accepted: 03/29/2018] [Indexed: 11/18/2022] Open
Abstract
Purpose To assess the association of genes in the high-density lipoprotein metabolic pathway (HDLMP) with polypoidal choroidal vasculopathy (PCV) and the genetic difference in the HDLMP between PCV and age-related macular degeneration (AMD). Methods We performed a literature search in EMBASE, PubMed, and Web of Science for genetic studies on 7 single nucleotide polymorphisms (SNPs) from 5 genes in the HDLMP including cholesteryl ester transfer protein (CETP), hepatic lipase (LIPC), lipoprotein lipase (LPL), ATP-binding cassette transporter A1 (ABCA1), and ATP-binding cassette transporter G1 (ABCG1) in PCV. All studies were published before September 30, 2017, without language restriction. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) of each polymorphism were estimated. We also compared the association profiles between PCV and AMD and performed a sensitivity analysis. Results Our result is based on 43 articles. After excluding duplicates and articles without complete information, 7 studies were applicable to meta-analysis. 7 polymorphisms were meta-analyzed: CETP rs2303790/rs3764261, LIPC rs10468017/rs493258, LPL rs12678919, ABCA1 rs1883025, and ABCG1 rs57137919. We found that in Asian population, CETP rs3764261 (T allele; OR = 1.46; 95% CI: 1.28–1.665, P < 0.01), CETP rs2303790 (G allele; OR = 1.57; 95% CI: 1.258–1.96, P < 0.01), and ABCG1 rs57137919 (A allele; OR = 1.168; 95% CI: 1.016–1.343, P < 0.01) were significantly associated with PCV, and ABCG1 rs57137919 (A allele; OR = 1.208, 95% CI: 1.035–1.411, P < 0.01) has different effects in PCV and AMD. The other 4 polymorphisms in LIPC/LPL/ABCA1 had no significant association with PCV (P > 0.05). The sensitivity analysis validated the significance of our analysis. Conclusions Our study revealed 7 polymorphisms in 5 genes. Among them, CETP (rs3764261/rs2303790) and ABCG1 (rs57137919) were the major susceptibility genes for PCV in Asian population and ABCG1 (rs57137919) showed allelic diversity between PCV and AMD. Since the size for PCV and AMD was small, we need to study these genes genotyping in larger samples.
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6
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Banevicius M, Vilkeviciute A, Kriauciuniene L, Liutkeviciene R, Deltuva VP. The Association Between Variants of Receptor for Advanced Glycation End Products (RAGE) Gene Polymorphisms and Age-Related Macular Degeneration. Med Sci Monit 2018; 24:190-199. [PMID: 29317590 PMCID: PMC5771184 DOI: 10.12659/msm.905311] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Background Age-related macular degeneration (AMD) is the leading cause of blindness in people aged 65 years and older in developed countries. The pathogenesis of AMD has been linked to mechanisms involving inflammation, oxidative stress, and basal laminar deposit formation between retinal pigment epithelium (RPE) cells and the basal membrane, caused by advanced glycation end products (AGEs). AGEs are implicated in the pathogenesis of AMD through the AGE-and receptor for AGE (RAGE) interaction, which can be altered by polymorphisms of the RAGE gene. We examined RAGE rs1800624 and rs1800625 gene polymorphisms contributing to AMD development. Material/Methods The study enrolled 300 patients with early AMD, 300 patients with exudative AMD, and 800 healthy controls. The genotyping was carried out using the RT-PCR method. Results The analysis of two single nucleotide polymorphisms (SNPs) in the RAGE gene showed that rs1800624 was associated with a 1.6-fold decreased risk for exudative AMD under the dominant model after adjustment for age (OR=0.616; 95% CI: 0.394–0.963; p=0.034) and each copy of allele T at rs1800624 was associated with a 1.4-fold decreased risk for exudative AMD development under the additive model after adjustment for age (OR=0.701; 95% CI: 0.510–0.962; p=0.028). Analysis revealed that the rs1800625 allele G at rs1800625 was associated with a 1.5-fold increased risk for exudative AMD after adjustment for age (OR=1.545; 95% CI: 1.003–2.379; p=0.048). These results suggested that the allele G at rs1800625 was a risk-allele for exudative AMD development. In haplotype analysis, A-G haplotype was significantly more frequently observed in exudative AMD patients compared to healthy controls (3.3% versus 1.4%, p=0.035). Conclusions We revealed a significant association between RAGE gene rs1800624 and rs1800625 polymorphisms and AMD risk. We considered T allele at rs1800624 to be protective against AMD development, while allele G at rs1800625 was considered to be a marker of poor prognosis in AMD development.
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Affiliation(s)
- Mantas Banevicius
- Department of Ophthalmology, Lithuanian University of Health Sciences, Medical Academy, Kaunas, Lithuania
| | - Alvita Vilkeviciute
- Neuroscience Institute, Lithuanian University of Health Sciences, Medical Academy, Kaunas, Lithuania
| | - Loresa Kriauciuniene
- Department of Ophthalmology, Lithuanian University of Health Sciences, Medical Academy, Kaunas, Lithuania.,Neuroscience Institute, Lithuanian University of Health Sciences, Medical Academy, Kaunas, Lithuania
| | - Rasa Liutkeviciene
- Department of Ophthalmology, Lithuanian University of Health Sciences, Medical Academy, Kaunas, Lithuania.,Neuroscience Institute, Lithuanian University of Health Sciences, Medical Academy, Kaunas, Lithuania
| | - Vytenis Pranas Deltuva
- Neuroscience Institute, Lithuanian University of Health Sciences, Medical Academy, Kaunas, Lithuania
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Sharma K, Tyagi R, Singh R, Sharma SK, Anand A. Serum Levels of TIMP-3, LIPC, IER3, and SLC16A8 in CFH-Negative AMD Cases. J Cell Biochem 2017; 118:2087-2095. [PMID: 27966779 DOI: 10.1002/jcb.25837] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 12/12/2016] [Indexed: 12/18/2022]
Abstract
AMD is a complex eye disease predominantly occurring in aged population. Till now about 53 genetic loci have been found to be associated with the AMD pathology. AMD pathogenesis is being increasingly known to progress through mechanisms independent of the CFH mediated pathway. Therefore, our aim for current study was to examine the genes by analyzing their expression levels in AMD. We recruited about 50 AMD and same number of age matched controls. We analyzed the CFH duplication and deletion by multiplex ligation probe amplification (MLPA) and found no duplication and deletion in CFH gene in AMD patients. We also estimated the IER-3, SLC16A8, LIPC, and TIMP-3 expression levels in both CFH-negative AMD cases (i.e. no duplication and deletion in CFH gene) besides examining these in AMD and controls. We found that the expression level of LIPC, SLC16A8, and TIMP-3 was significantly associated with AMD pathology in both groups (LIPC: P = 0.008, SLC16A8: P < 0.001, TIMP-3: P < 0.001, respectively). However, we did not find any significant difference in IER-3 levels in AMD and controls. Therefore, the evidence from current study, suggests that AMD pathology may be mediated through mechanistic pathways linked to other genetic loci. J. Cell. Biochem. 118: 2087-2095, 2017. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Kaushal Sharma
- Neuroscience Research Lab, Department of Neurology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.,Centre for Systems Biology and Bioinformatics, Panjab University, Chandigarh, India
| | - Rahul Tyagi
- Neuroscience Research Lab, Department of Neurology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Ramandeep Singh
- Departement of Ophthalmology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
| | - Suresh Kumar Sharma
- Centre for Systems Biology and Bioinformatics, Panjab University, Chandigarh, India.,Departement of Statistics, Panjab University, Chandigarh, India
| | - Akshay Anand
- Neuroscience Research Lab, Department of Neurology, Post Graduate Institute of Medical Education and Research, Chandigarh, India
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Miller JW, Bagheri S, Vavvas DG. Advances in Age-related Macular Degeneration Understanding and Therapy. ACTA ACUST UNITED AC 2017; 10:119-130. [PMID: 29142592 PMCID: PMC5683729 DOI: 10.17925/usor.2017.10.02.119] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
While the development of anti-vascular endothelial growth factor (anti-VEGF) as a therapy for neovascular age-related macular degeneration (AMD) was a great success, the pathologic processes underlying dry AMD that eventually leads to photoreceptor dysfunction, death, and vision loss remain elusive to date, with a lack of effective therapies and increasing prevalence of the disease. There is an overwhelming need to improve the classification system of AMD, to increase our understanding of cell death mechanisms involved in both neovascular and non-neovascular AMD, and to develop better biomarkers and clinical endpoints to eventually be able to identify better therapeutic targets—especially early in the disease process. There is no doubt that it is a matter of time before progress will be made and better therapies will be developed for non-neovascular AMD.
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Affiliation(s)
- Joan W Miller
- Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, US
| | - Saghar Bagheri
- Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, US
| | - Demetrios G Vavvas
- Retina Service, Department of Ophthalmology, Massachusetts Eye and Ear, Harvard Medical School, Boston, MA, US
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Wang Y, Wang M, Zhang X, Nie J, Zhang M, Liu X, Ma L. The Association between LIPC rs493258 Polymorphism and the Susceptibility to Age-Related Macular Degeneration. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:ijerph13101022. [PMID: 27763569 PMCID: PMC5086761 DOI: 10.3390/ijerph13101022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 09/25/2016] [Accepted: 10/08/2016] [Indexed: 12/29/2022]
Abstract
The purpose of this study was to evaluate the association of the hepatic lipase (LIPC) rs493258 polymorphism and susceptibility to age-related macular degeneration (AMD). A systematic search in PubMed, EMBASE, and ISI web of science databases was performed to identify eligible published studies without language restrictions up to April 2016. Pooled odds ratios (ORs) with 95% confidence intervals (CIs) in different stages of AMD were estimated under different genetic models using meta-analytic methods. Seven studies comprising 20,559 cases and 17,200 controls met the inclusion criteria and were included in the meta-analysis. The LIPC rs493258 polymorphism showed a significant association with a lower risk of AMD under the allelic model (OR = 0.87, 95% CI = 0.84–0.90). Significant relationships between the variant and AMD were also observed in other genetic models (OR ranging from 0.71 to 0.86, all p < 0.05). Stratified analysis based on ethnicity found that LIPC rs493258 polymorphism had a significant association with the decreased risk of the disease in the Caucasian population, but not in the Asian population. For late AMD, significant associations of the rs493258 polymorphism with a lower risk of this disease were also observed in the allelic genetic model (OR = 0.87, 95% CI = 0.83–0.90). This meta-analysis demonstrates that the T allele in the LIPC rs493258 polymorphism was significantly associated with the risk of any and late AMD. The associations of the locus with early and late AMD risk in various populations need further exploration.
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Affiliation(s)
- Yafeng Wang
- The First Affiliated Hospital of Xi'an Jiaotong University, College of Medicine, Xi'an Jiaotong University, Xi'an 710061, China.
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an 710004, China.
- School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an 710061, China.
| | - Mingxu Wang
- School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an 710061, China.
| | - Xiaoqing Zhang
- Department of Public Health, Xi'an Medical University, Xi'an 710021, China.
| | - Jing Nie
- School of Humanities, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Ming Zhang
- Department of Internal Medicine, Xi'an Honghui Hospital, Xi'an 710054, China.
| | - Xiaohong Liu
- The First Affiliated Hospital of Xi'an Jiaotong University, College of Medicine, Xi'an Jiaotong University, Xi'an 710061, China.
| | - Le Ma
- School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an 710061, China.
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10
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Leach LL, Croze RH, Hu Q, Nadar VP, Clevenger TN, Pennington BO, Gamm DM, Clegg DO. Induced Pluripotent Stem Cell-Derived Retinal Pigmented Epithelium: A Comparative Study Between Cell Lines and Differentiation Methods. J Ocul Pharmacol Ther 2016; 32:317-30. [PMID: 27182743 DOI: 10.1089/jop.2016.0022] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
PURPOSE The application of induced pluripotent stem cell-derived retinal pigmented epithelium (iPSC-RPE) in patients with retinal degenerative disease is making headway toward the clinic, with clinical trials already underway. Multiple groups have developed methods for RPE differentiation from pluripotent cells, but previous studies have shown variability in iPSC propensity to differentiate into RPE. METHODS This study provides a comparison between 2 different methods for RPE differentiation: (1) a commonly used spontaneous continuously adherent culture (SCAC) protocol and (2) a more rapid, directed differentiation using growth factors. Integration-free iPSC lines were differentiated to RPE, which were characterized with respect to global gene expression, expression of RPE markers, and cellular function. RESULTS We found that all 5 iPSC lines (iPSC-1, iPSC-2, iPSC-3, iPSC-4, and iPSC-12) generated RPE using the directed differentiation protocol; however, 2 of the 5 iPSC lines (iPSC-4 and iPSC-12) did not yield RPE using the SCAC method. Both methods can yield bona fide RPE that expresses signature RPE genes and carry out RPE functions, and are similar, but not identical to fetal RPE. No differences between methods were detected in transcript levels, protein localization, or functional analyses between iPSC-1-RPE, iPSC-2-RPE, and iPSC-3-RPE. Directed iPSC-3-RPE showed enhanced transcript levels of RPE65 compared to directed iPSC-2-RPE and increased BEST1 expression and pigment epithelium-derived factor (PEDF) secretion compared to directed iPSC-1-RPE. In addition, SCAC iPSC-3-RPE secreted more PEDF than SCAC iPSC-1-RPE. CONCLUSIONS The directed protocol is a more reliable method for differentiating RPE from various pluripotent sources and some iPSC lines are more amenable to RPE differentiation.
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Affiliation(s)
- Lyndsay L Leach
- 1 Center for Stem Cell Biology and Engineering, University of California , Santa Barbara, California.,2 Neuroscience Research Institute, University of California , Santa Barbara, California.,3 Department of Molecular, Cellular and Developmental Biology, University of California , Santa Barbara, California
| | - Roxanne H Croze
- 1 Center for Stem Cell Biology and Engineering, University of California , Santa Barbara, California.,2 Neuroscience Research Institute, University of California , Santa Barbara, California.,3 Department of Molecular, Cellular and Developmental Biology, University of California , Santa Barbara, California
| | - Qirui Hu
- 1 Center for Stem Cell Biology and Engineering, University of California , Santa Barbara, California.,2 Neuroscience Research Institute, University of California , Santa Barbara, California
| | - Vignesh P Nadar
- 1 Center for Stem Cell Biology and Engineering, University of California , Santa Barbara, California.,4 California State University , Channel Islands, Camarillo, California
| | - Tracy N Clevenger
- 1 Center for Stem Cell Biology and Engineering, University of California , Santa Barbara, California.,2 Neuroscience Research Institute, University of California , Santa Barbara, California.,3 Department of Molecular, Cellular and Developmental Biology, University of California , Santa Barbara, California
| | - Britney O Pennington
- 1 Center for Stem Cell Biology and Engineering, University of California , Santa Barbara, California.,2 Neuroscience Research Institute, University of California , Santa Barbara, California
| | - David M Gamm
- 5 Waisman Center, University of Wisconsin-Madison , Madison, Wisconsin.,6 McPherson Eye Research Institute, University of Wisconsin-Madison , Madison, Wisconsin.,7 Department of Ophthalmology and Visual Sciences, University of Wisconsin-Madison , Madison, Wisconsin
| | - Dennis O Clegg
- 1 Center for Stem Cell Biology and Engineering, University of California , Santa Barbara, California.,2 Neuroscience Research Institute, University of California , Santa Barbara, California.,3 Department of Molecular, Cellular and Developmental Biology, University of California , Santa Barbara, California
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11
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Sergejeva O, Botov R, Liutkevičienė R, Kriaučiūnienė L. Genetic factors associated with the development of age-related macular degeneration. MEDICINA-LITHUANIA 2016; 52:79-88. [PMID: 27170480 DOI: 10.1016/j.medici.2016.02.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 10/01/2015] [Accepted: 02/13/2016] [Indexed: 12/12/2022]
Abstract
Age-related macular degeneration (AMD) affects the macula and is the leading cause of significant and irreversible central visual loss. It is the most common cause of visual loss in people aged more than 60 years. This disease affects 2.5 million individuals in Europe. AMD is caused by both environmental and genetic factors. Numerous risk factors have been reported, but the pathogenesis of AMD is complex and fairly understood. Age, female gender, obesity, race, education status, family history, hyperopia, iris color, cigarette smoking, previous cataract surgery, history of cardiovascular and cerebrovascular disease, diabetes, sunlight exposure and many other factors have been shown to be associated with AMD development. Scientific evidence shows that genes may play a role in the development of nearly 3 out of 4 cases of this devastating eye disease. The genes that have been shown to be associated with AMD are genes encoding complement system components such as CFH, C2, C3, CFB, and other.
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Affiliation(s)
- Olga Sergejeva
- Department of Ophthalmology, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania.
| | - Roman Botov
- Faculty of Medicine, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Rasa Liutkevičienė
- Department of Ophthalmology, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania; Laboratory of Ophthalmology, Neuroscience Institute, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
| | - Loresa Kriaučiūnienė
- Laboratory of Ophthalmology, Neuroscience Institute, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania
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12
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Meng Q, Huang L, Sun Y, Bai Y, Wang B, Yu W, Zhao M, Li X. Effect of High-Density Lipoprotein Metabolic Pathway Gene Variations and Risk Factors on Neovascular Age-Related Macular Degeneration and Polypoidal Choroidal Vasculopathy in China. PLoS One 2015; 10:e0143924. [PMID: 26624898 PMCID: PMC4666634 DOI: 10.1371/journal.pone.0143924] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 11/11/2015] [Indexed: 01/07/2023] Open
Abstract
Purpose To investigate the effect of genetic variants in the high-density lipoprotein (HDL) metabolic pathway and risk factors on neovascular age-related macular degeneration (nAMD) and polypoidal choroidal vasculopathy (PCV) in China. Methods A total of 742 Chinese subjects, including 221 controls, 230 cases with nAMD, and 291 cases with PCV, were included in the present study. Five single nucleotide polymorphisms (SNPs) from three genes in the HDL metabolic pathway (HDLMP) including cholesteryl ester transfer protein (CETP), hepatic lipase (LIPC) and lipoprotein lipase (LPL) were genotyped in all study subjects with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). Risk factors including gender, hypertension, hyperlipidemia, diabetes mellitus, and coronary artery disease were identified. Chi-square tests or Fisher’s exact tests were applied to discover associations between SNPs and risk factors for PCV and nAMD. Gene-gene interactions and gene-environment interactions were evaluated by the multifactor-dimensionality reduction (MDR) method. Results CETP rs3764261 were significantly associated with an increased risk for PCV (odds ratio (OR) = 1.444, P = 0.0247). LIPC rs1532085 conferred an increased risk for PCV (OR = 1.393, P = 0.0094). We found no association between PCV and LPL rs12678919, LIPC rs10468017 or CETP rs173539. No association was found between five SNPs with nAMD. Regarding risk factors, females were found to have significantly decreased risks for both PCV and nAMD (P = 0.006 and 0.001, respectively). Coronary artery disease (CAD) was a risk factor in PCV patients but played a protective role in nAMD patients. Hyperlipidemia was associated with PCV but not with nAMD. Neither hypertension nor diabetes mellitus was associated with PCV or nAMD. The MDR analysis revealed that a three-locus model with rs12678919, rs1532085, and gender was the best model for nAMD, while a five-locus model consisting of rs10468017, rs3764261, rs1532085, gender, and hyperlipidemia was best for PCV. Conclusion Our large-sample study suggested that CETP rs3764261 conferred an increased risk for PCV. We also first found the association between rs1532085 and PCV. The result of present study also showed that gender and CAD are associated with PCV and nAMD. Significant association was found between hyperlipidemia and PCV but not nAMD.
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Affiliation(s)
- Qingyu Meng
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
| | - Lvzhen Huang
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
| | - Yaoyao Sun
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
| | - Yujing Bai
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
| | - Bin Wang
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
| | - Wenzhen Yu
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
| | - Mingwei Zhao
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
- * E-mail: (MZ); (XL)
| | - Xiaoxin Li
- Peking University People’s Hospital, Ophthalmology Department, Beijing, China
- Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing, China
- Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing, China
- * E-mail: (MZ); (XL)
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Wang YF, Han Y, Zhang R, Qin L, Wang MX, Ma L. CETP/LPL/LIPC gene polymorphisms and susceptibility to age-related macular degeneration. Sci Rep 2015; 5:15711. [PMID: 26503844 PMCID: PMC4621603 DOI: 10.1038/srep15711] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 08/18/2015] [Indexed: 12/17/2022] Open
Abstract
Three high-density lipoprotein (HDL)-related loci have been reported to be associated with age-related macular degeneration (AMD), but the results were inconsistent. In this study, the cholesteryl ester transfer protein (CETP) rs3764261 variant was significantly associated with an increased risk of AMD (odds ratio [OR] = 1.13, 95% confidence interval [CI]: 1.05–1.21, P < 0.001), and the hepatic lipase (LIPC) rs10468017 variant was associated with a significantly decreased risk of AMD (OR = 0.81, CI: 0.76–0.86, P < 0.001). Individuals carrying the lipoprotein lipase (LPL) rs12678919 polymorphism (A → G) had no significant change in the risk of developing AMD (OR = 1.01, CI: 0.92–1.10, P = 0.17). After adjusting for the complement factor H (CFH) gene, both CETP and LPL conferred a significantly increased AMD risk (ORCETP = 1.17, CI: 1.08–1.26, P < 0.001; ORLPL = 1.11, CI: 1.01–1.22, P = 0.02). Subgroup analysis based on ethnicity revealed a significant association between the CETP variant and AMD in both Americans (OR = 1.12, CI: 1.02–1.23, P = 0.01) and Europeans (OR = 1.10, CI: 1.01–1.19, P = 0.011). This meta-analysis revealed that both CETP rs3764261 and LIPC rs10468017 polymorphisms were significantly associated with AMD risk. After adjustment for the CFH gene, CETP/LPL conferred a significantly increased susceptibility to the disease, indicating potential interactions among genes in the complement system and the lipid metabolism pathway.
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Affiliation(s)
- Ya-Feng Wang
- School of Public Health, Xi'an Jiao tong University Health Science Center, Xi'an, China
| | - Yue Han
- School of Public Health, Xi'an Jiao tong University Health Science Center, Xi'an, China
| | - Rui Zhang
- School of Public Health, Xi'an Jiao tong University Health Science Center, Xi'an, China
| | - Li Qin
- The First Affiliated Hospital, Xi'an Jiao tong University College of Medicine, Xi'an, China
| | - Ming-Xu Wang
- School of Public Health, Xi'an Jiao tong University Health Science Center, Xi'an, China
| | - Le Ma
- School of Public Health, Xi'an Jiao tong University Health Science Center, Xi'an, China
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Mechanism of inflammation in age-related macular degeneration: an up-to-date on genetic landmarks. Mediators Inflamm 2013; 2013:435607. [PMID: 24369445 PMCID: PMC3863457 DOI: 10.1155/2013/435607] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 09/28/2013] [Indexed: 12/13/2022] Open
Abstract
Age-related macular degeneration (AMD) is the most common cause of irreversible visual impairment among people over 50 years of age, accounting for up to 50% of all cases of legal blindness in Western countries. Although the aging represents the main determinant of AMD, it must be considered a multifaceted disease caused by interactions among environmental risk factors and genetic backgrounds. Mounting evidence and/or arguments document the crucial role of inflammation and immune-mediated processes in the pathogenesis of AMD. Proinflammatory effects secondary to chronic inflammation (e.g., alternative complement activation) and heterogeneous types of oxidative stress (e.g., impaired cholesterol homeostasis) can result in degenerative damages at the level of crucial macular structures, that is photoreceptors, retinal pigment epithelium, and Bruch's membrane. In the most recent years, the association of AMD with genes, directly or indirectly, involved in immunoinflammatory pathways is increasingly becoming an essential core for AMD knowledge. Starting from the key basic-research notions detectable at the root of AMD pathogenesis, the present up-to-date paper reviews the best-known and/or the most attractive genetic findings linked to the mechanisms of inflammation of this complex disease.
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