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Li H, Wang M, Qu K, Xu R, Zhu H. MP Allosterically Activates AMPK to Enhance ABCA1 Stability by Retarding the Calpain-Mediated Degradation Pathway. Int J Mol Sci 2023; 24:17280. [PMID: 38139111 PMCID: PMC10743971 DOI: 10.3390/ijms242417280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 12/01/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
It is widely recognized that macrophage cholesterol efflux mediated by the ATP-binding cassette transporter A1 (ABCA1) constitutes the initial and rate-limiting step of reverse cholesterol transport (RCT), displaying a negative correlation with the development of atherosclerosis. Although the transcriptional regulation of ABCA1 has been extensively studied in previous research, the impact of post-translational regulation on its expression remains to be elucidated. In this study, we report an AMP-activated protein kinase (AMPK) agonist called ((2R,3S,4R,5R)-3,4-dihydroxy-5-(6-((3-hydroxyphenyl) amino)-9H-purin-9-yl) tetrahydrofuran-2-yl) methyl dihydrogen phosphate (MP), which enhances ABCA1 expression through post-translational regulation rather than transcriptional regulation. By integrating the findings of multiple experiments, it is confirmed that MP directly binds to AMPK with a moderate binding affinity, subsequently triggering its allosteric activation. Further investigations conducted on macrophages unveil a novel mechanism through which MP modulates ABCA1 expression. Specifically, MP downregulates the Cav1.2 channel to obstruct the influx of extracellular Ca2+, thereby diminishing intracellular Ca2+ levels, suppressing calcium-activated calpain activity, and reducing the interaction strength between calpain and ABCA1. This cascade of events culminates in the deceleration of calpain-mediated degradation of ABCA1. In conclusion, MP emerges as a potentially promising candidate compound for developing agents aimed at enhancing ABCA1 stability and boosting cellular cholesterol efflux and RCT.
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Affiliation(s)
| | | | | | | | - Haibo Zhu
- State Key Laboratory for Bioactive Substances and Functions of Natural Medicines, Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation Study, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Xian Nong Tan Street 1, Xicheng District, Beijing 100050, China; (H.L.); (M.W.); (K.Q.); (R.X.)
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2
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Nordestgaard LT, Christoffersen M, Afzal S, Nordestgaard BG, Tybjærg-Hansen A, Frikke-Schmidt R. Genetic variants in the adenosine triphosphate-binding cassette transporter A1 and risk of age-related macular degeneration. Eur J Epidemiol 2023; 38:985-994. [PMID: 37335386 PMCID: PMC10501952 DOI: 10.1007/s10654-023-01021-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 05/25/2023] [Indexed: 06/21/2023]
Abstract
Genetic variants in ABCA1 are associated with higher concentrations of high-density lipoprotein (HDL) cholesterol. Higher HDL cholesterol concentrations are observationally and genetically associated with higher risk of age-related macular degeneration (AMD). However, whether amino acid-changing genetic variants in ABCA1 associated with high HDL cholesterol concentrations confer a higher risk of AMD in the general population is currently unknown. We tested this hypothesis. The study included 80,972 individuals (1,370 AMD cases) from the Copenhagen General Population Study (CGPS) and 9,584 individuals (142 AMD cases) from the Copenhagen City Heart Study (CCHS) with 10 to 18 years of follow-up. We created an HDL cholesterol weighted allele score based on amino acid-changing ABCA1 variants with a minor allele frequency above 0.001 and divided it into tertiles. The study included 55% women. Mean age was 58 years. The ABCA1 allele score for the third versus the first tertile was associated with HRs (95% confidence intervals (CIs)) of 1.30 (1.14-1.49) for all-cause AMD, 1.26 (1.06-1.50) for nonneovascular AMD, and 1.31 (1.12-1.53) for neovascular AMD in a multivariable adjusted model. On a continuous scale, higher concentrations of genetically determined HDL cholesterol were associated with higher risk of all-cause AMD, nonneovascular AMD, and neovascular AMD in an age- and sex adjusted model and in a multivariable adjusted model. In conclusion, amino acid-changing genetic variants in ABCA1 associated with higher HDL cholesterol concentrations were also associated with higher risk of AMD, suggesting a role for ABCA1 in AMD pathogenesis.
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Affiliation(s)
- Liv Tybjærg Nordestgaard
- Department of Clinical Biochemistry, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Mette Christoffersen
- Department of Clinical Biochemistry, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
| | - Shoaib Afzal
- Department of Clinical Biochemistry, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Børge Grønne Nordestgaard
- Department of Clinical Biochemistry, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- The Copenhagen General Population Study, Department of Clinical Biochemistry, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark
- The Copenhagen City Heart Study, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - Anne Tybjærg-Hansen
- Department of Clinical Biochemistry, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
- The Copenhagen General Population Study, Department of Clinical Biochemistry, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark
- The Copenhagen City Heart Study, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark
| | - Ruth Frikke-Schmidt
- Department of Clinical Biochemistry, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark.
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
- The Copenhagen General Population Study, Department of Clinical Biochemistry, Copenhagen University Hospital - Herlev and Gentofte, Copenhagen, Denmark.
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Wang SH, Guo C, Cui WJ, Xu QX, Zhang J, Jiang JZ, Liu Y, Chen S, Chen C, Cheng JT, Liu A. Two pyrrole acids isolated from Phyllanthus emblica L. and their bioactivities. Nat Prod Bioprospect 2023; 13:26. [PMID: 37639046 PMCID: PMC10462542 DOI: 10.1007/s13659-023-00393-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 08/21/2023] [Indexed: 08/29/2023]
Abstract
An undescribed pyrrole acid, 1-(4'-methoxy-4'-oxobutyl)-1 H-pyrrole-2,5-dicarboxylic acid (1) and one known pyrrole acid (2) were isolated from the fruits of Phyllanthus emblica. The structures of these compounds were elucidated via the comprehensive analyses of IR, HRESIMS, 1D and 2D spectroscopic data. A series of biological assays revealed that compounds 1 and 2 could inhibit LPS-induced over-production of nitric oxide (NO), interleukin-6 (IL-6), monocyte chemotactic protein 1 (MCP-1) and tumor necrosis factor-α (TNF-α) by reducing the phosphorylation of extracellular regulated protein kinases (ERK) and c-Jun N-terminal kinases (JNK) in RAW 264.7 cells. Additionally, compounds 1 and 2 were found to reduce lipid deposition and increase the mRNA expression of ATP-binding cassette transporter A1 in oxidized low-density lipoprotein-treated RAW264.7 macrophages.
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Affiliation(s)
- Shu-Hui Wang
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Cong Guo
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Wen-Jin Cui
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Qing-Xia Xu
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Jun Zhang
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Jin-Zhu Jiang
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Yan Liu
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Sha Chen
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Chang Chen
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Jin-Tang Cheng
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China.
| | - An Liu
- Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, 100700, China.
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Sacher S, Mukherjee A, Ray A. Deciphering structural aspects of reverse cholesterol transport: mapping the knowns and unknowns. Biol Rev Camb Philos Soc 2023; 98:1160-1183. [PMID: 36880422 DOI: 10.1111/brv.12948] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 02/03/2023] [Accepted: 02/24/2023] [Indexed: 03/08/2023]
Abstract
Atherosclerosis is a major contributor to the onset and progression of cardiovascular disease (CVD). Cholesterol-loaded foam cells play a pivotal role in forming atherosclerotic plaques. Induction of cholesterol efflux from these cells may be a promising approach in treating CVD. The reverse cholesterol transport (RCT) pathway delivers cholesteryl ester (CE) packaged in high-density lipoproteins (HDL) from non-hepatic cells to the liver, thereby minimising cholesterol load of peripheral cells. RCT takes place via a well-organised interplay amongst apolipoprotein A1 (ApoA1), lecithin cholesterol acyltransferase (LCAT), ATP binding cassette transporter A1 (ABCA1), scavenger receptor-B1 (SR-B1), and the amount of free cholesterol. Unfortunately, modulation of RCT for treating atherosclerosis has failed in clinical trials owing to our lack of understanding of the relationship between HDL function and RCT. The fate of non-hepatic CEs in HDL is dependent on their access to proteins involved in remodelling and can be regulated at the structural level. An inadequate understanding of this inhibits the design of rational strategies for therapeutic interventions. Herein we extensively review the structure-function relationships that are essential for RCT. We also focus on genetic mutations that disturb the structural stability of proteins involved in RCT, rendering them partially or completely non-functional. Further studies are necessary for understanding the structural aspects of RCT pathway completely, and this review highlights alternative theories and unanswered questions.
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Affiliation(s)
- Sukriti Sacher
- Department of Computational Biology, Indraprastha Institute of Information Technology, Okhla Phase III, New Delhi, 110019, India
| | - Abhishek Mukherjee
- Dhiti Life Sciences Pvt Ltd, B-107, Okhla Phase I, New Delhi, 110020, India
| | - Arjun Ray
- Department of Computational Biology, Indraprastha Institute of Information Technology, Okhla Phase III, New Delhi, 110019, India
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5
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Zhu Y, Xu Y, Han D, Zhang X, Qin C, Liu J, Tian L, Xu M, Fang Y, Zhang Y, Wang Y, Cao F. Scavenger receptor-AI targeted theranostic nanoparticles for regression of atherosclerotic plaques via ABCA1 modulation. Nanomedicine 2023; 50:102672. [PMID: 37044196 DOI: 10.1016/j.nano.2023.102672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 03/09/2023] [Accepted: 03/22/2023] [Indexed: 04/14/2023]
Abstract
ATP-binding cassette transporter A1 (ABCA1) plays a crucial role in atherosclerotic formation through mediated cholesterol efflux in macrophage-derived foam cells. In this study, a scavenger receptors AI (SR-AI) targeted theranostic nanoparticles was constructed for atherosclerosis regression via ABCA1 activation in foam cells. ABCA1-upregulator 5242331 and IR780 were encapsulated in PLGA-PEG micelles which were conjugated with SR-AI targeting peptide (PP1) to formulate the nanoparticles (SAU-NPs). Immunostaining revealed that SR-AI was highly expressed both in macrophage foam cells and in atherosclerotic plaque of ApoE-/- mice. The SAU-NPs have shown more active targeting to plaque lesion with higher stability compared with non-SR-AI targeted nanoparticles. The transformation from macrophage to foam cells was inhibited by SAU-NPs carried 5242331. Cholesterol deposition was effectively reduced in foam cells by SAU-NPs through activating the LXRα-ABCA1/ABCG1/SR-BI pathway. In conclusion, theranostic SAU-NPs which carried ABCA1-upregulator 5242331 exert beneficial effects on atherosclerosis regression via LXRα activation.
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Affiliation(s)
- Yan Zhu
- School of Medicine, Nankai University, Tianjin 300071, China; Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Yanni Xu
- NHC Key Laboratory of Biotechnology of Antibiotics, National Center for Screening Novel Microbial Drugs, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC), 1# Tiantan Xili, Beijing 100050, China
| | - Dong Han
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Xiujin Zhang
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Cheng Qin
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Jing Liu
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Lei Tian
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Mengqi Xu
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Yan Fang
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Yang Zhang
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China
| | - Yabin Wang
- Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
| | - Feng Cao
- School of Medicine, Nankai University, Tianjin 300071, China; Department of Cardiology, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, 2nd Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
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6
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Shavva VS, Babina AV, Nekrasova EV, Lisunov AV, Dizhe EB, Oleinikova GN, Orlov SV. Insulin Downregulates the Expression of ATP-binding Cassette Transporter A-I in Human Hepatoma Cell Line HepG2 in a FOXO1 and LXR Dependent Manner. Cell Biochem Biophys 2023; 81:151-160. [PMID: 36251137 DOI: 10.1007/s12013-022-01109-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 10/05/2022] [Indexed: 11/03/2022]
Abstract
ATP-binding cassette transporter A-I (ABCA1) is an ubiquitously expressed protein whose main function is the transmembrane transport of cholesterol and phospholipids. Synthesis of ABCA1 protein in liver is necessary for high-density lipoprotein (HDL) formation in mammals. Thus, the mechanism of ABCA1 gene expression regulation in hepatocytes are of critical importance. Recently, we have found the insulin-dependent downregulation of other key player in the HDL formation-apolipoprotein A-I gene (J. Cell. Biochem., 2017, 118:382-396). Nothing is known about the role of insulin in the regulation of ABCA1 gene. Here we show for the first time that insulin decreases the mRNA and protein levels of ABCA1 in human hepatoma cell line HepG2. PI3K, p38, MEK1/2, JNK and mTORC1 signaling pathways are involved in the insulin-mediated downregulation of human ABCA1 gene. Transcription factors LXRα, LXRβ, FOXO1 and NF-κB are important contributors to this process, while FOXA2 does not regulate ABCA1 gene expression. Insulin causes the decrease in FOXO1, LXRα and LXRβ binding to ABCA1 promoter, which is likely the cause of the decrease in the gene expression. Interestingly, the murine ABCA1 gene seems to be not regulated by insulin in hepatocytes (in vitro and in vivo). We suggest that the reason for this discrepancy is the difference in the 5'-regulatory regions of human and murine ABCA1 genes.
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Affiliation(s)
- Vladimir S Shavva
- Department of Biochemistry, Institute of Experimental Medicine, St. Petersburg, Russia
| | - Anna V Babina
- Department of Biochemistry, Institute of Experimental Medicine, St. Petersburg, Russia
| | - Ekaterina V Nekrasova
- Department of Biochemistry, Institute of Experimental Medicine, St. Petersburg, Russia
| | - Alexey V Lisunov
- Department of Biochemistry, Institute of Experimental Medicine, St. Petersburg, Russia.,Department of Embryology, St. Petersburg State University, St. Petersburg, Russia
| | - Ella B Dizhe
- Department of Biochemistry, Institute of Experimental Medicine, St. Petersburg, Russia
| | - Galina N Oleinikova
- Department of Biochemistry, Institute of Experimental Medicine, St. Petersburg, Russia
| | - Sergey V Orlov
- Department of Biochemistry, Institute of Experimental Medicine, St. Petersburg, Russia. .,Department of Embryology, St. Petersburg State University, St. Petersburg, Russia.
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7
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Zhao J, Wang J, Zhao D, Wang L, Luo X. Association Between ABCA1 R219K Variant and Alzheimer's Disease: An Updated Meta-Analysis and Systematic Review. Curr Alzheimer Res 2023; 19:734-741. [PMID: 36380407 DOI: 10.2174/1567205020666221114112838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 10/19/2022] [Accepted: 10/21/2022] [Indexed: 11/17/2022]
Abstract
BACKGROUND Over a dozen studies have investigated the effect of the R219K variant in the ATP-binding cassette transporter A1 (ABCA1) gene on the risk of Alzheimer's disease (AD), but the results are conflicting. OBJECTIVE We performed a systematic review and meta-analysis to comprehensively assess the association between the ABCA1 R219K variant and the risk of AD. METHODS Studies included in the meta-analysis were obtained by searching PubMed, Web of Science and AlzGene. Review Manager 5.4 was used for meta-analysis. Both the odds ratio (OR) and its 95% confidence interval (CI) were used to evaluate the effect of ABCA1 R219K polymorphism on AD susceptibility. Heterogeneity between the included studies was assessed using I2 statistics and Cochran Qtest. Funnel plots were used to assess publication bias. RESULTS A total of 14 eligible studies involving 10084 subjects were retrieved from PubMed, Web of Science and AlzGene. Meta-analysis results showed that R219K polymorphism was significantly associated with a decreased risk of AD in Chinese under a recessive model (OR = 0.67; 95% CI = 0.51- 0.88; P = 0.004). CONCLUSION The present meta-analysis indicated that the KK genotype of R219K polymorphism may act as a protective factor for AD in the Chinese population. Additional studies with larger sample sizes are needed to further confirm this association.
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Affiliation(s)
- Jinrong Zhao
- Academy of Life Science, School of Medicine, Xi'an International University, Xi'an 710077, China.,Engineering Research Center of Personalized Anti-aging Health Product Development and Transformation, Universities of Shaanxi Province, Xi'an 710077, China
| | - Jinpei Wang
- Academy of Life Science, School of Medicine, Xi'an International University, Xi'an 710077, China.,Engineering Research Center of Personalized Anti-aging Health Product Development and Transformation, Universities of Shaanxi Province, Xi'an 710077, China
| | - Dong Zhao
- Academy of Life Science, School of Medicine, Xi'an International University, Xi'an 710077, China.,Engineering Research Center of Personalized Anti-aging Health Product Development and Transformation, Universities of Shaanxi Province, Xi'an 710077, China
| | - Lin Wang
- Academy of Life Science, School of Medicine, Xi'an International University, Xi'an 710077, China.,Engineering Research Center of Personalized Anti-aging Health Product Development and Transformation, Universities of Shaanxi Province, Xi'an 710077, China
| | - Xiaoe Luo
- Academy of Life Science, School of Medicine, Xi'an International University, Xi'an 710077, China.,Engineering Research Center of Personalized Anti-aging Health Product Development and Transformation, Universities of Shaanxi Province, Xi'an 710077, China
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Gao T, Qian T, Wang T, Su Y, Qiu H, Tang W, Xing Q, Wang L. T0901317, a liver X receptor agonist, ameliorates perinatal white matter injury induced by ischemia and hypoxia in neonatal rats. Neurosci Lett 2023; 793:136994. [PMID: 36460235 DOI: 10.1016/j.neulet.2022.136994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 11/24/2022] [Accepted: 11/27/2022] [Indexed: 12/05/2022]
Abstract
Perinatal white matter injury (PWMI) can lead to permanent neurological damage in preterm infants and bring a huge economic burden to their families and society. Liver X receptors (LXRs) are transcription factors that have been confirmed to mediate the myelination process under physiological conditions and are involved in regulating neurogenesis in adult animal models of acute and chronic cerebral ischemia. However, the role of LXRs in PWMI induced by both ischemic and hypoxic stimulation in the immature brain has not been reported. Herein, we investigated the role of LXRs in a neonatal rat model of white matter loss after hypoxia-ischemia (HI) injury through intraperitoneal injection of the LXR agonist T0901317 (T09) 1 day before and 15 min postinjury. The in vivo data showed that T09 treatment significantly facilitated myelination and ameliorated neurological behavior after PWMI. Moreover, T09 enhanced the proliferation of oligodendrocyte lineage cells and reduced microgliosis and astrogliosis in the microenvironment for oligodendrocytes (OLs), maintaining a healthy microenvironment for myelinating OLs. In vitro data suggested that the expression of the myelin-related genes Plp and Cnpase was increased in OLN-93 cells after T09 intervention compared with OLN-93 cells injured by oxygen and glucose deprivation (OGD). In primary mixed astrocytes/microglia cells, T09 also reduced the expression of Il6, Cox2, Tnfa and Il10 that was induced by OGD. Mechanistically, the mRNA expression level and the protein level of ATP binding cassette subfamily A member 1 (Abca1) decreased after HI injury, and the protective effect of T09 might be related to the activation of the LXRβ-ABCA1 signaling pathway. Our study revealed the protective role of LXRs in myelination and white matter homeostasis, providing a potential therapeutic option for PWMI.
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Affiliation(s)
- Ting Gao
- National Health Commission Key Laboratory of Neonatal Diseases, Department of Neonatology, Children's Hospital of Fudan University, Shanghai 201102, China; Department of Neonatology, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Tianyang Qian
- National Health Commission Key Laboratory of Neonatal Diseases, Department of Neonatology, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Tianwei Wang
- Department of Neurosurgery, Shanghai Jiaotong University School of Medicine Affiliated Renji Hospital, Shanghai, China
| | - Yu Su
- Department of Neonatology, Children's Hospital of Fudan University and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Han Qiu
- National Health Commission Key Laboratory of Neonatal Diseases, Department of Neonatology, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Wan Tang
- National Health Commission Key Laboratory of Neonatal Diseases, Department of Neonatology, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Qinghe Xing
- Department of Neonatology, Children's Hospital of Fudan University and Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Laishuan Wang
- National Health Commission Key Laboratory of Neonatal Diseases, Department of Neonatology, Children's Hospital of Fudan University, Shanghai 201102, China; Department of Neonatology, National Children's Medical Center, Children's Hospital of Fudan University, Shanghai 201102, China.
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Liang Z, Jiao W, Wang L, Chen Y, Li D, Zhang Z, Zhang Z, Liang Y, Niu H. CYP27A1 inhibits proliferation and migration of clear cell renal cell carcinoma via activation of LXRs/ABCA1. Exp Cell Res 2022;:113279. [PMID: 35810773 DOI: 10.1016/j.yexcr.2022.113279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 07/05/2022] [Accepted: 07/05/2022] [Indexed: 11/22/2022]
Abstract
Cholesterol homeostasis plays an important role in the maintenance of normal body functions. CYP27A1 is a key enzyme known to regulate cholesterol homeostasis, which catalyzes the conversion of cholesterol to 27-HC and has been implicated in the occurrence and metastasis of various cancer types. The present study aimed to explore the regulatory role of CYP27A1 in the development of clear cell renal cell carcinoma (ccRCC). In particular, the effect of CYP27A1 on the proliferation and migration of ccRCC cells was investigated. The construction of a stable 786-O cell line overexpressing CYP27A1/pLVX was mediated by lentiviral infection. The proliferative capacity was assessed using MTT and colony formation. Wound healing assay was used to measure cell migration. Production of intracellular cholesterol and 27-HC was detected by enzyme-linked immunosorbent assay. The LXRs/ABCA1 pathway of cholesterol metabolism regulation was studied by RT-qPCR and Western blotting analysis after cells were treated with stimulation agents of 27-HC or T0901317 and inhibition agents of siRNA or GSK2033. The results revealed that overexpression of CYP27A1 could increase the intracellular production of 27-HC and inhibit the proliferation and migration of 786-O cells. And the treatment of 786-O cells with 27-HC induced a similar effect. CYP27A1/27HC mediated activation of the liver X receptors (LXRs) could up-regulate the expression of ATP-binding cassette transporter A1 (ABCA1), further resulting in the reduction of intracellular cholesterol contents. All of these findings indicated a regulatory role of CYP27A1 in the proliferation and migration of ccRCC, via activating LXRs/ABCA1 to regulate cholesterol homeostasis.
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10
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Li Y, Meng S, Di W, Xia M, Dong L, Zhao Y, Ling S, He J, Xue X, Chen X, Liu C. Amyloid-β protein and MicroRNA-384 in NCAM-Labeled exosomes from peripheral blood are potential diagnostic markers for Alzheimer's disease. CNS Neurosci Ther 2022; 28:1093-1107. [PMID: 35470961 PMCID: PMC9160455 DOI: 10.1111/cns.13846] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 03/14/2022] [Accepted: 04/06/2022] [Indexed: 11/27/2022] Open
Abstract
Objective We aimed to establish a method to determine whether amyloid‐β (Aβ) protein and miR‐384 in peripheral blood neural cell adhesion molecule (NCAM)/ATP‐binding cassette transporter A1 (ABCA1) dual‐labeled exosomes may serve as diagnostic markers for the diagnosis of Alzheimer's disease (AD). Methods This was a multicenter study using a two‐stage design. The subjects included 45 subjective cognitive decline (SCD) patients, 50 amnesic mild cognitive impairment (aMCI) patients, 40 AD patients, and 30 controls in the discovery stage. The results were validated in the verification stage in 47 SCD patients, 45 aMCI patients, 45 AD patients, and 30 controls. NCAM single‐labeled and NCAM/ABCA1 double‐labeled exosomes in the peripheral blood were captured and detected by immunoassay. Results The Aβ42, Aβ42/40, Tau, P‐T181‐tau, and miR‐384 levels in NCAM single‐labeled and NCAM/ABCA1 double‐labeled exosomes of the aMCI and AD groups were significantly higher than those of the SCD, control, and vascular dementia (VaD) groups (all p < 0.05). The Aβ42 and miR‐384 levels in NCAM/ABCA1 dual‐labeled exosomes of the aMCI and AD groups were higher than those of the control and VaD groups (all p < 0.05). The exosomal Aβ42, Aβ42/40, Tau, P‐T181‐tau, and miR‐384 levels in peripheral blood were correlated with those in cerebrospinal fluid (all p < 0.05). Conclusion This study, for the first time, established a method that sorts specific surface marker exosomes using a two‐step immune capture technology. The plasma NCAM/ABCA1 dual‐labeled exosomal Aβ42/40 and miR‐384 had potential advantages in the diagnosis of SCD.
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Affiliation(s)
- Ying Li
- Clinical Laboratory of Beijing Anding Hospital, Capital Medical University, Beijing, China.,Clinical Laboratory of Air Force General Hospital, Chinese People's Liberation Army, Beijing, China
| | - Shuang Meng
- State Key Laboratory for Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Beijing, China
| | - Wu Di
- Clinical Laboratory of Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Ming Xia
- Clinical Laboratory of Minhang Hospital, Fudan University, Shanghai, China
| | - Lei Dong
- Clinical Laboratory of Air Force General Hospital, Chinese People's Liberation Army, Beijing, China
| | - Yue Zhao
- Clinical Laboratory of Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Sihai Ling
- Clinical Laboratory of Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Jing He
- Clinical Laboratory of Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Xiaoxing Xue
- Clinical Laboratory of Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Xiali Chen
- Clinical Laboratory of Beijing Anding Hospital, Capital Medical University, Beijing, China
| | - Chengeng Liu
- Clinical Laboratory of Beijing Anding Hospital, Capital Medical University, Beijing, China
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11
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Abstract
BACKGROUND Imbalance between amyloid-β (Aβ) production and clearance results in Aβ accumulation. Regulating Aβ levels is still a hot point in the research of Alzheimer's disease (AD). OBJECTIVE To identify the differential expression of ATP-binding cassette transporter A1 (ABCA1) and its upstream microRNA (miRNA) in AD models, and to explore their relationships with Aβ levels. METHODS Quantitative real-time polymerase chain reaction (qRT-PCR) and western blotting were performed to determine the expression of ABCA1 in 5xFAD mice, SH-SY5Y cells treated with Aβ oligomers and SH-SY5YAβPP695 cells (AD models). TargetScan was used to predict the upstream miRNAs for ABCA1. Dual-luciferase assay was conducted to identify the regulation of the miRNA on ABCA1. qRT-PCR was used to measure the expression of miRNA in AD models. Finally, enzyme-linked immunosorbent assays were performed to detect Aβ42 and Aβ40 levels. RESULTS The expression of ABCA1 was significantly downregulated in AD models at both mRNA and protein levels. Dual-luciferase assay showed that miR-96-5p could regulate the expression of ABCA1 through binding to the 3 untranslated region of ABCA1. The level of miR-96-5p was significantly elevated in AD models. The expression of ABCA1 was enhanced while Aβ42 levels and Aβ42/Aβ40 ratios were reduced in SH-SY5YAβPP695 cells after treated with miR-96-5p inhibitor. CONCLUSION The current study found that miR-96-5p is the upstream miRNA for ABCA1. Suppression of miR-96-5p in AD models could reduce Aβ42/Aβ40 ratios via upregulating the expression of ABCA1, indicating that miR-96-5p plays an important role in regulating the content of Aβ.
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Affiliation(s)
- Min Zhu
- Innovation Center for Neurological Disorders and Department of Neurology, Xuanwu Hospital, Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, P.R. China
| | - Longfei Jia
- Innovation Center for Neurological Disorders and Department of Neurology, Xuanwu Hospital, Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, P.R. China
| | - Jianping Jia
- Innovation Center for Neurological Disorders and Department of Neurology, Xuanwu Hospital, Capital Medical University, National Clinical Research Center for Geriatric Diseases, Beijing, P.R. China.,Beijing Key Laboratory of Geriatric Cognitive Disorders, Beijing, P.R. China.,Clinical Center for Neurodegenerative Disease and Memory Impairment, Capital Medical University, Beijing, P.R. China.,Center of Alzheimer's Disease, Beijing Institute of Brain Disorders, Collaborative Innovation Center for Brain Disorders, Capital Medical University, Beijing, P.R. China.,Key Laboratory of Neurodegenerative Diseases, Ministry of Education, Beijing, P.R. China
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12
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Tan M, Ye J, Zhao M, Ke X, Huang K, Liu H. Recent developments in the regulation of cholesterol transport by natural molecules. Phytother Res 2021; 35:5623-5633. [PMID: 34327759 DOI: 10.1002/ptr.7198] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 06/02/2021] [Accepted: 06/07/2021] [Indexed: 11/10/2022]
Abstract
The dysregulation of cholesterol metabolism is a high-risk factor for non-alcoholic fatty liver disease (NAFLD), dyslipidemia, and atherosclerosis (AS). Cholesterol transport maintains whole-body cholesterol homeostasis. Low-density apolipoprotein receptor (LDLR) mediates cholesterol uptake in cells and plays an important role in the primary route of circulatory cholesterol clearance in liver cells. Caveolins 1 is an integral membrane protein and shuttle between the cytoplasm and cell membrane. Caveolins 1 not only plays a role in promoting cholesterol absorption in cells but also in the transport of cellular cholesterol efflux by interacting with the ATP-binding cassette transporter A1 (ABCA1) and scavenger receptor class B type I (SR-BI). These proteins, which are associated with reverse cholesterol transport (RCT), are potential therapeutic targets for NAFLD and AS. Many studies have indicated that natural products have lipid-lowering effects. Moreover, natural molecules, derived from natural products, have the potential to be developed into novel drugs. However, the mechanisms underlying the regulation of cholesterol transport by natural molecules have not yet been adequately investigated. In this review, we briefly describe the process of cholesterol transport and summarize the mechanisms by which molecules regulate cholesterol transport. This article provides an overview of recent studies and focuses on the potential therapeutic effects of natural molecules; however, further high-quality studies are needed to firmly establish the clinical efficacies of natural molecules.
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Affiliation(s)
- Meiao Tan
- Chongqing Traditional Chinese Medicine Hospital, Chongqing, China.,First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Jintong Ye
- First Clinical Medical College, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Min Zhao
- Guangzhou Liwan District Traditional Chinese Medicine Hospital, Guangzhou, China
| | - Xuehong Ke
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Keer Huang
- The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Huabao Liu
- Chongqing Traditional Chinese Medicine Hospital, Chongqing, China
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13
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Dong Y, Lin Y, Liu W, Zhang W, Jiang Y, Song W. Atrial Natriuretic Peptide Inhibited ABCA1/G1-dependent Cholesterol Efflux Related to Low HDL-C in Hypertensive Pregnant Patients. Front Pharmacol 2021; 12:715302. [PMID: 34393795 PMCID: PMC8355588 DOI: 10.3389/fphar.2021.715302] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 06/24/2021] [Indexed: 01/03/2023] Open
Abstract
Objective: It has been reported that atrial natriuretic peptide (ANP) regulates lipid metabolism by stimulating adipocyte browning, lipolysis, and lipid oxidation, and by impacting the secretion of adipokines. In our previous study, we found that the plasma ANP concentration of hypertensive disorders of pregnancy (HDP) was significantly increased in comparison to that of normotensive pregnancy patients. Thus, this study’s objective was to investigate the lipid profile in patients with HDP and determine the effects of ANP on the cholesterol efflux in THP-1 macrophages. Methods: A total of 265 HDP patients and 178 normotensive women as the control group were recruited. Clinical demographic characteristics and laboratory profile data were collected. Plasma total triglycerides (TGs), total cholesterol (TC), low-density cholesterol (LDL-C), and high-density cholesterol (HDL-C) were compared between the two groups. THP-1 monocytes were incubated with different concentrations of ANP. ATP-binding cassette transporter A1 (ABCA1) and ATP-binding cassette transporter G1 (ABCG1) mRNA and protein were evaluated. ABCA1- and ABCG1-mediated cholesterol efflux to apolipoprotein A-Ⅰ (apoA-Ⅰ) and HDL, respectively, were measured by green fluorescent labeled NBD cholesterol. Natriuretic peptide receptor A (NPR-A) siRNA and specific agonists of the peroxisome proliferator–activated receptor-γ (PPAR-γ) and liver X receptor α (LXRα) were studied to investigate the mechanism involved. Results: Plasma TG, TC, LDL-C, and LDL-C/HDL-C were significantly increased, and HDL-C was significantly decreased in the HDP group in comparison to the control (all p < 0.001). ANP inhibited the expression of ABCA1 and ABCG1 at both the mRNA and protein levels in a dose-dependent manner. The functions of ABCA1- and ABCG1-mediated cholesterol efflux to apoA-I and HDL were significantly decreased. NPR-A siRNA further confirmed that ANP binding to its receptor inhibited ABCA1/G1 expression through the PPAR-γ/LXRα pathway. Conclusions: ABCA1/G1 was inhibited by the stimulation of ANP when combined with NPR-A through the PPAR-γ/LXRα pathway in THP-1 macrophages. The ABCA1/G1-mediated cholesterol efflux was also impaired by the stimulation of ANP. This may provide a new explanation for the decreased level of HDL-C in HDP patients.
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Affiliation(s)
- Yubing Dong
- Department of Hypertension, The First Affiliated Hospital of Dalian Medical University, DaLian, China
| | - Yi Lin
- Department of Hypertension, The First Affiliated Hospital of Dalian Medical University, DaLian, China
| | - Wanyu Liu
- Department of Hypertension, The First Affiliated Hospital of Dalian Medical University, DaLian, China
| | - Wei Zhang
- Department of Hypertension, The First Affiliated Hospital of Dalian Medical University, DaLian, China
| | - Yinong Jiang
- Department of Hypertension, The First Affiliated Hospital of Dalian Medical University, DaLian, China
| | - Wei Song
- Department of Hypertension, The First Affiliated Hospital of Dalian Medical University, DaLian, China
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14
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Wu YT, Li JB, Lin HQ, Zhang GX, Hong CM, Li M, Guo ZJ, Yang YB. Inhibition of miR-200b-3p alleviates lipid accumulation and promotes cholesterol efflux by targeting ABCA1 in macrophage-derived foam cells. Exp Ther Med 2021; 22:831. [PMID: 34149877 PMCID: PMC8200800 DOI: 10.3892/etm.2021.10263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Accepted: 05/07/2021] [Indexed: 12/13/2022] Open
Abstract
Atherosclerosis (As) is a chronic cardiovascular disease characterized by abnormal of lipid accumulation and cholesterol efflux. The present study aimed to investigate whether the micro-RNA (miR)-200b-3p could exacerbate As by promoting lipid accumulation and inhibiting cholesterol efflux via ATP-binding cassette transporter A1 (ABCA1) in macrophage-derived foam cells. Blood samples from 30 patients with As and 30 healthy people were collected at Quanzhou First Hospital. RAW264.7 cells were used to establish foam cells using oxidized low-density lipoprotein. The expression of miR-200b-3p and ABCA1 was evaluated by reverse transcription quantitative PCR and western blotting. Lipid accumulation was analyzed by Oil Red O staining and cholesterol content was assessed by ELISA. A targeting relationship between miR-200b-3p and ABCA1 was demonstrated by luciferase reporter assays. Compared with healthy volunteers and RAW264.7 cells, the expression level of miR-200b-3p was significantly increased whereas the expression level of ABCA1 was significantly decreased in patients with As and foam cells. Furthermore, miR-200b-3p expression was negatively correlated with ABCA1 expression in the blood of the patients with As. Lipid content was significantly decreased and cholesterol efflux was significantly increased in foam cells transfected with the miR-200b-3p inhibitor compared with inhibitor control cells. In addition, ABCA1 was shown to be targeted by miR-200b-3p. Furthermore, the lipid content in foam cells transfected with the miR-200b-3p inhibitor and small interfering-ABCA1 was significantly increased, while the cholesterol efflux was significantly decreased compared with foam cells transfected with the miR-200b-3p inhibitor. In conclusion, the findings from the present study indicated that inhibition of miR-200b-3p may alleviate lipid accumulation and promote cholesterol efflux by targeting ABCA1 in macrophage-derived foam cells.
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Affiliation(s)
- Yu-Ting Wu
- Department of Geriatrics, Quanzhou First Hospital, Quanzhou, Fujian 362000, P.R. China
| | - Jiang-Bin Li
- Department of Ultrasound, Quanzhou Maternity and Child Healthcare Hospital, Quanzhou, Fujian 362000, P.R. China
| | - Hui-Qin Lin
- Department of Geriatrics, Quanzhou First Hospital, Quanzhou, Fujian 362000, P.R. China
| | - Guo-Xin Zhang
- Department of Geriatrics, Quanzhou First Hospital, Quanzhou, Fujian 362000, P.R. China
| | - Cong-Min Hong
- Department of Geriatrics, Quanzhou First Hospital, Quanzhou, Fujian 362000, P.R. China
| | - Ming Li
- School of Medicine, Hunan University of Medicine, Huaihua, Hunan 418000, P.R. China
| | - Zhi-Jun Guo
- Department of Geriatrics, Quanzhou First Hospital, Quanzhou, Fujian 362000, P.R. China
| | - Yan-Bing Yang
- Department of Imaging, Mengchao Hepatobiliary Hospital of Fujian Medical University, Fuzhou, Fujian 350002, P.R. China
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15
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Wu D, Hu Y, Song M, Li G. Dichlorodiphenyltrichloroethane Impairs Amyloid Beta Clearance by Decreasing Liver X Receptor α Expression. Front Aging Neurosci 2021; 13:634948. [PMID: 34045954 PMCID: PMC8144330 DOI: 10.3389/fnagi.2021.634948] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 03/22/2021] [Indexed: 11/30/2022] Open
Abstract
Abnormal amyloid beta (Aβ) clearance is a distinctive pathological mechanism for Alzheimer’s disease (AD). ATP-binding cassette transporter A1 (ABCA1), which mediates the lipidation of apolipoprotein E, plays a critical role in Aβ clearance. As an environmental factor for AD, dichlorodiphenyltrichloroethane (DDT) can decrease ATP-binding cassette transporter A1 (ABCA1) expression and disrupt Aβ clearance. Liver X receptor α (LXRα) is an autoregulatory transcription factor for ABCA1 and a target of some environmental pollutants, such as organophosphate pesticides. In this study, we aimed to investigate whether DDT could affect Aβ clearance by targeting LXRα. The DDT-pretreated H4 human neuroglioma cells and immortalized astrocytes were incubated with exogenous Aβ to evaluate Aβ consumption. Meanwhile, cytotoxicity and LXRα expression were determined in the DDT-treated cells. Subsequently, the antagonism of DDT on LXRα agonist T0901317 was determined in vitro. The interaction between DDT and LXRα was predicted by molecular docking and molecular dynamics simulation technology. We observed that DDT could inhibit Aβ clearance and decrease the levels of LXRα mRNA and LXRα protein. Moreover, DDT is supposed to strongly bind to LXRα and exert antagonistic effects on LXRα. In conclusion, this study firstly presented that DDT could inhibit LXRα expression, which would contribute to Aβ clearance decline in vitro. It provides an experimental basis to search for potential therapeutic targets of AD.
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Affiliation(s)
- Dongmei Wu
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yang Hu
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Min Song
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Gongbo Li
- Department of Neurology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
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16
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Yin Q, Chang H, Shen Q, Xing D. Photobiomodulation therapy promotes the ATP-binding cassette transporter A1-dependent cholesterol efflux in macrophage to ameliorate atherosclerosis. J Cell Mol Med 2021; 25:5238-5249. [PMID: 33951300 PMCID: PMC8178257 DOI: 10.1111/jcmm.16531] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 02/15/2021] [Accepted: 03/05/2021] [Indexed: 01/21/2023] Open
Abstract
Atherosclerosis is a chronic inflammatory disease related to a massive accumulation of cholesterol in the artery wall. Photobiomodulation therapy (PBMT) has been reported to possess cardioprotective effects but has no consensus on the underlying mechanisms. Here, we aimed to investigate whether PBMT could ameliorate atherosclerosis and explore the potential molecular mechanisms. The Apolipoprotein E (ApoE)−/− mice were fed with western diet (WD) for 18 weeks and treated with PBMT once a day in the last 10 weeks. Quantification based on Oil red O‐stained aortas showed that the average plaque area decreased 8.306 ± 2.012% after PBMT (P < .05). Meanwhile, we observed that high‐density lipoprotein cholesterol level in WD + PBMT mice increased from 0.309 ± 0.037 to 0.472 ± 0.038 nmol/L (P < .05) compared with WD mice. The further results suggested that PBMT could promote cholesterol efflux from lipid‐loaded primary peritoneal macrophages and inhibit foam cells formation via up‐regulating the ATP‐binding cassette transporters A1 expression. A contributing mechanism involved in activating the phosphatidylinositol 3‐kinases/protein kinase C zeta/specificity protein 1 signalling cascade. Our study outlines that PBMT has a protective role on atherosclerosis by promoting macrophages cholesterol efflux and provides a new strategy for treating atherosclerosis.
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Affiliation(s)
- Qianxia Yin
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
| | - Haocai Chang
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
| | - Qi Shen
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
| | - Da Xing
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou, China
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17
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Yan R, Luo J, He X, Li S. Association between ABC family variants rs1800977, rs4149313, and rs1128503 and susceptibility to type 2 diabetes in a Chinese Han population. J Int Med Res 2020; 48:300060520941347. [PMID: 32762489 PMCID: PMC7557792 DOI: 10.1177/0300060520941347] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Accepted: 06/19/2020] [Indexed: 12/31/2022] Open
Abstract
OBJECTIVE To investigate the association between three single nucleotide polymorphisms (SNPs) of the ATP-binding cassette (ABC) gene family and susceptibility to type 2 diabetes mellitus in a Chinese Han population. METHODS A total of 1086 type 2 diabetes patients and 1122 healthy controls were included in this retrospective study. Three genetic variants, rs1800977 and rs4149313 in ABCA1, and rs1128503 in ABCB1 were included in the study. Susceptibility to type 2 diabetes was evaluated under three genetic models. RESULTS A significant association between rs1800977 and type 2 diabetes was identified in three different genetic models (TT vs CC, odds ratio [OR] = 0.611 [95% confidence interval (CI), 0.469-0.798]; T vs C, OR = 0.841 [95% CI, 0.745-0.950]; and the recessive model, OR = 0.606 [95% CI, 0.474-0.774]). Additionally, a significant association between rs4149313 and type 2 diabetes was identified in three different genetic models (AA vs GG, OR = 0.467 [95% CI, 0.326-0.670]; A vs G, OR = 0.819 [95% CI, 0.717-0.935]; and the recessive model, OR = 0.478 [95% CI, 0.336-0.680]). CONCLUSION We found that SNPs rs1800977 and rs4149313 in ABCA1 are significantly associated with susceptibility to type 2 diabetes in a Chinese population, although this should be confirmed in a larger study.
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Affiliation(s)
- Ruicheng Yan
- Department of Gastrointestinal Surgery, East Section of Renmin Hospital of Wuhan University, Wuhan, China
- Department of Bariatric Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Jianfei Luo
- Department of Bariatric Surgery, Renmin Hospital of Wuhan University, Wuhan, China
| | - Xiaobo He
- Department of Gastrointestinal Surgery, East Section of Renmin Hospital of Wuhan University, Wuhan, China
| | - Shijun Li
- Department of Bariatric Surgery, Renmin Hospital of Wuhan University, Wuhan, China
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Abstract
BACKGROUND Recent studies have shown that hyperlipidemia is closely related to the progression of kidney disease and glomerulosclerosis has similar pathophysiological mechanisms with atherosclerosis. Atherosclerosis is essentially a chronic inflammatory process and various kidney diseases are characterized by a micro-inflammatory state. Hyperlipidemia levels are not parallel to the degree of glomerulosclerosis, inflammatory factors together with lipids may contribute to the pathogenesis of glomerulosclerosis. Therefore, it is key to clarify lipid-mediated renal injury through studying the mechanism by which inflammation affects cholesterol homeostasis at the cellular level. Intracellular lipid homeostasis involves both lipid uptake and excretion, therefore in this study, we aimed to explore whether interleukin-1β (IL-1β) promotes the uptake of oxidized low-density lipoprotein (Ox-LDL) to increase in intracellular lipid levels, and to clarify the effect of IL-1β on the expression of lectin-like oxidized LDL receptor 1 (LOX-1) and ATP-binding cassette transporter A1 (ABCA1), which may regulate cholesterol homeostasis in human mesangial cells (HMCs). METHODS The effect of IL-1β on uptake of Ox-LDL labeled with fluorescent Dil (Dil-Ox-LDL) by HMCs was observed using laser confocal microscopy. The effect of IL-1β on LOX-1 and ABCA1 expression in HMCs was detected by polymerase chain reaction and western blotting. RESULTS Laser confocal microscopy revealed that HMCs took up Dil-Ox-LDL. Treatment of HMCs with 5 ng/ml IL-1β for 24 h significantly increased uptake of Dil-Ox-LDL. IL-1β also promoted LOX-1 mRNA and protein expression in a dose-dependent manner. Moreover, ABCA1 mRNA and protein expression were reduced by IL-1β in lipid-loaded HMCs in a dose-dependent manner. CONCLUSIONS IL-1β promotes the uptake of Ox-LDL and expression of LOX-1 in HMCs, whereas it inhibits expression of ABCA1 under lipid load. The imbalance in intracellular cholesterol resulted by IL-1β can in turn transform HMCs into foam cells and aggravate glomerulosclerosis.
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Affiliation(s)
- H Liu
- Dr. Hua Liu, Department of Nephrology, Xuan Wu Hospital, Capital Medical University, Beijing 100053, China, e-mail: , Tel: +(86)18911651038; Dr. Lina Ma, Department of Geriatrics, Xuan Wu Hospital, Capital Medical University, Beijing 100053, China, e-mail: , Tel: +(86)17600107787
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Hafiane A, Gasbarrino K, Daskalopoulou SS. The role of adiponectin in cholesterol efflux and HDL biogenesis and metabolism. Metabolism 2019; 100:153953. [PMID: 31377319 DOI: 10.1016/j.metabol.2019.153953] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 07/29/2019] [Accepted: 07/30/2019] [Indexed: 12/27/2022]
Abstract
Cholesterol efflux is the initial step in the reverse cholesterol transport pathway by which excess cholesterol in peripheral cells is exported and subsequently packaged into high-density lipoprotein (HDL) particles. Adiponectin is the most abundantly secreted adipokine that possesses anti-inflammatory and vasculoprotective properties via interaction with transmembrane receptors, AdipoR1 and AdipoR2. Evidence suggests that low levels of adiponectin may be a useful marker for atherosclerotic disease. A proposed anti-atherogenic mechanism of adiponectin involves its ability to promote cholesterol efflux. We performed a systematic review of the role of adiponectin in cholesterol efflux and HDL biogenesis, and of the proteins and receptors believed to be implicated in this process. Nineteen eligible studies (7 clinical, 11 fundamental, 1 clinical + fundamental) were identified through Ovid Medline, Ovid Embase, and Pubmed, that support the notion that adiponectin plays a key role in promoting ABCA1-dependent cholesterol efflux and in modulating HDL biogenesis via activation of the PPAR-γ/LXR-α signalling pathways in macrophages. AdipoR1 and AdipoR2 are suggested to also be implicated in this process, however the data are conflicting/insufficient to establish any firm conclusions. Once the exact mechanisms are unravelled, adiponectin may be critical in defining future treatment strategies directed towards increasing HDL functionality and ultimately reducing atherosclerotic disease.
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Affiliation(s)
- Anouar Hafiane
- Department of Medicine, Faculty of Medicine, Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.
| | - Karina Gasbarrino
- Department of Medicine, Faculty of Medicine, Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.
| | - Stella S Daskalopoulou
- Department of Medicine, Faculty of Medicine, Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada.
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Horiuchi Y, Ohkawa R, Lai SJ, Yamazaki A, Ikoma H, Yano K, Kameda T, Tozuka M. Characterization of the cholesterol efflux of apolipoprotein E-containing high-density lipoprotein in THP-1 cells. Biol Chem 2019; 400:209-218. [PMID: 30210053 DOI: 10.1515/hsz-2018-0284] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 09/02/2018] [Indexed: 01/02/2023]
Abstract
High-density lipoprotein (HDL), also known as antiatherogenic lipoprotein, consists of heterogeneous particles in terms of size, density and composition, suggesting differences among HDL subclasses in characteristics and functions. We investigated the role of apolipoprotein E (apoE)-containing HDL, a minor HDL subclass, in the cholesterol efflux capacity (CEC) of HDL, which is its predominant atheroprotective function. The CEC of apoE-containing HDL was similar to that of apoE-deficient HDL, but the former exhibited a greater rate increase (1.48-fold) compared to that of the latter (1.10-fold) by the stimulation of THP-1 macrophages with the Liver X Receptor (LXR) agonist. No difference in CEC was observed without the LXR agonist between apoA-I, the main apolipoprotein in HDL, and apoE, whereas the increase in CEC in response to treatment with the LXR agonist was greater for apoA-I (4.25-fold) than for apoE (2.22-fold). Furthermore, the increase in the CEC of apoE-containing HDL induced by the LXR agonist was significantly reduced by treatment with glyburide, an inhibitor of ATP-binding cassette transporter A1 (ABCA1). These results suggest that apoE-containing HDL, unlike apoE-deficient HDL, is involved in cholesterol efflux via ABCA1.
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Affiliation(s)
- Yuna Horiuchi
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Ryunosuke Ohkawa
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Shao-Jui Lai
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Azusa Yamazaki
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Hayato Ikoma
- Clinical Laboratory, Hamamatsu University Hospital, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Kouji Yano
- Center for Genomic and Regenerative Medicine, Graduate School of Medicine, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, Japan
| | - Takahiro Kameda
- Department of Medical Technology, School of Health Sciences, Tokyo University of Technology, 5-23-22 Nishikamata, Ota-ku, Tokyo 144-8535, Japan
| | - Minoru Tozuka
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
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Wang X, Zhao H, Yan W, Liu Y, Yin T, Wang S, Fan M, Li C, Zhang L, Tao L. Thioredoxin-1 promotes macrophage reverse cholesterol transport and protects liver from steatosis. Biochem Biophys Res Commun 2019; 516:1103-9. [PMID: 31280865 DOI: 10.1016/j.bbrc.2019.06.109] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 06/19/2019] [Indexed: 12/22/2022]
Abstract
Atherosclerosis is characterized by the accumulation of excess cholesterol in plaques. Reverse cholesterol transport (RCT) plays a key role in the removal of cholesterol. In the present study, we examined the effect of thioredoxin-1 (Trx-1) on RCT and explored the underlying mechanism. We found that Trx-1 promoted RCT in vivo, as did T0901317, a known liver X receptor (LXR) ligand. T0901317 also inhibited the development of atherosclerotic plaques but promoted liver steatosis. Furthermore, Trx-1 promoted macrophage cholesterol efflux to apoAI in vitro. Mechanistically, Trx-1 promoted nuclear translocation of LXRα and induced the expression of ATP-binding cassette transporter A1 (ABCA1). Apolipoprotein E knockout (apoE-/-) mice fed an atherogenic diet were daily injected intraperitoneally with saline or Trx-1 (0.33 mg/kg). Trx-1 treatment significantly inhibited the development of atherosclerosis and induced the expression of ABCA1 in macrophages retrieved from apoE-/- mice. Moreover, the liver steatosis was attenuated by Trx-1. Overall, we demonstrated that Trx-1 promotes RCT by upregulating ABCA1 expression through induction of nuclear translocation of LXRα, and protects liver from steatosis.
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Smirnov GP, Malyshev PP, Rozhkova TA, Zubareva MY, Shuvalova YA, Rebrikov DV, Titov VN. [The effect of ABCA1 rs2230806 common gene variant on plasma lipid levels in patients with dyslipidemia.]. Klin Lab Diagn 2019; 63:410-413. [PMID: 30720955 DOI: 10.18821/0869-2084 -2018-63-7-410-413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Accepted: 04/01/2018] [Indexed: 11/17/2022]
Abstract
The aim of this work was to assess the relationship of rs2230806 SNP of ABCA1 with lipid profile in patients with severe dyslipidemia. The study included 363 patients (42.8% of males), the average age was 48.7 years, 35.5% of patients received hypolipidemic drugs (mainly statins). Quantitative determination of total cholesterol (ТС) and triglycerides (TG) in fasting serum was carried out by a unified enzymatic method, and high density lipoproteins (HDL) - by a direct homogeneous method. Genotype according to the rs2230806 position in the ABCA1 gene was determined by polymerase chain reaction (PCR) «in real time» using adjacent samples and melting reaction products after PCR. The frequencies of alleles and genotypes of variant rs2230806 of ABCA1 gene in patients with dyslipidemia did not differ from those in the control group of healthy individuals (athletes). The levels of plasma lipids - TC, TG and HDL cholesterol, on average, in patients with dyslipidemia were 7.8±3,4, 3,4±6,5 and 1.29±0.4 mmol/l, respectively. Compared to different genotypes, the plasma lipid concentrations did not differ significantly, but the analysis of different inheritance models of the allelic variant studied showed a significant association with the level of TG in the additive model, in which each minor allele (a) further enhanced the effect on the level of plasma TG at 1.02 mmol/l (p=0.044). The results of this study demonstrate the effect of a common variant rs2230806 of the ABCA1 gene on the plasma TG level in patients with severe dyslipidemia.
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Affiliation(s)
- G P Smirnov
- City Polyclinic № 212 of the Moscow Healthcare Department, Moscow, 119620
| | - P P Malyshev
- National Medical Research Center of Cardiology, Moscow, 121552
| | - T A Rozhkova
- National Medical Research Center of Cardiology, Moscow, 121552
| | - M Y Zubareva
- National Medical Research Center of Cardiology, Moscow, 121552
| | - Y A Shuvalova
- National Medical Research Center of Cardiology, Moscow, 121552
| | - D V Rebrikov
- Pirogov Russian National Research Medical University, Moscow, 117997.,National Medical Research Center of Obstetrics, Gynecology and Perinatology, Moscow, 117997
| | - V N Titov
- National Medical Research Center of Cardiology, Moscow, 121552
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23
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Wang X, Li R, Zacharek A, Landschoot-Ward J, Wang F, Wu KH, Chopp M, Chen J, Cui X. Administration of Downstream ApoE Attenuates the Adverse Effect of Brain ABCA1 Deficiency on Stroke. Int J Mol Sci 2018; 19:E3368. [PMID: 30373276 DOI: 10.3390/ijms19113368] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 10/19/2018] [Accepted: 10/22/2018] [Indexed: 11/17/2022] Open
Abstract
The ATP-binding cassette transporter member A1 (ABCA1) and apolipoprotein E (ApoE) are major cholesterol transporters that play important roles in cholesterol homeostasis in the brain. Previous research demonstrated that specific deletion of brain-ABCA1 (ABCA1-B/-B) reduced brain grey matter (GM) and white matter (WM) density in the ischemic brain and decreased functional outcomes after stroke. However, the downstream molecular mechanism underlying brain ABCA1-deficiency-induced deficits after stroke is not fully understood. Adult male ABCA1-B/-B and ABCA1-floxed control mice were subjected to distal middle-cerebral artery occlusion and were intraventricularly infused with artificial mouse cerebrospinal fluid as vehicle control or recombinant human ApoE2 into the ischemic brain starting 24 h after stroke for 14 days. The ApoE/apolipoprotein E receptor 2 (ApoER2)/high-density lipoprotein (HDL) levels and GM/WM remodeling and functional outcome were measured. Although ApoE2 increased brain ApoE/HDL levels and GM/WM density, negligible functional improvement was observed in ABCA1-floxed-stroke mice. ApoE2-administered ABCA1-B/-B stroke mice exhibited elevated levels of brain ApoE/ApoER2/HDL, increased GM/WM density, and neurogenesis in both the ischemic ipsilateral and contralateral brain, as well as improved neurological function compared with the vehicle-control ABCA1-B/-B stroke mice 14 days after stroke. Ischemic lesion volume was not significantly different between the two groups. In vitro supplementation of ApoE2 into primary cortical neurons and primary oligodendrocyte-progenitor cells (OPCs) significantly increased ApoER2 expression and enhanced cholesterol uptake. ApoE2 promoted neurite outgrowth after oxygen-glucose deprivation and axonal outgrowth of neurons, and increased proliferation/survival of OPCs derived from ABCA1-B/-B mice. Our data indicate that administration of ApoE2 minimizes the adverse effects of ABCA1 deficiency after stroke, at least partially by promoting cholesterol traffic/redistribution and GM/WM remodeling via increasing the ApoE/HDL/ApoER2 signaling pathway.
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Yao Y, Li Q, Wang W, Zhang J, Gao P, Xu Y. Glucagon-Like Peptide-1 Modulates Cholesterol Homeostasis by Suppressing the miR-19b-Induced Downregulation of ABCA1. Cell Physiol Biochem 2018; 50:679-693. [PMID: 30308521 DOI: 10.1159/000494235] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 10/03/2018] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Abnormal regulation of cholesterol homeostasis is associated with type 2 diabetes mellitus (T2DM) and multiple other diseases. Glucagon-like peptide-1 (GLP-1) has unique effects on modulating hepatic lipid metabolism. However, the mechanism behind these is largely unknown. The aim of this study was to investigate the effects of GLP-1 on cholesterol-induced lipotoxicity in hepatocytes and examine the underlying mechanisms. METHODS Cell viability was determined by CCK-8. Caspase-3 detection was used to assess the effects of GLP-1 on cholesterol-induced apoptosis. TNF-α and IL-6 as the inflammatory markers were measured by ELISA. The alterations of miR-19b and ATP-binding cassette transporter A1 (ABCA1) resulting from high-fat diet/cholesterol incubation or GLP-1 were detected by real-time PCR and western blot. RESULTS GLP-1 markedly up-regulated the expression of ABCA1 protein, but didn't affect peroxisome proliferator-activated receptor α (PPAR-α) protein. The miR-19b levels were significantly down-regulated in GLP-1-treated groups. The inhibition and overexpression of miR-19b were established to explore the effects of a GLP-1-mediated alteration in miR-19b. Cholesterol transport assays revealed that treatment with GLP-1 alone or together with miR-19b inhibitor significantly enhanced ABCA1-dependent cholesterol efflux, resulting in reduced total cholesterol. Further, histological examination was used to detect lipid accumulation. Cholesterol significantly attenuated cell viability, promoted hepatic cell apoptosis, and facilitated lipid accumulation, and these effects could be reversed by GLP-1. CONCLUSION GLP-1 may affect cholesterol homeostasis by regulating the expression of miR-19b and ABCA1.
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Affiliation(s)
- Yue Yao
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Harbin Medical University, Harbin, China.,The Key Laboratory of Myocardial Ischemia, Harbin Medical University, Ministry of Education, Harbin, China
| | - Qiang Li
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Wei Wang
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jinchao Zhang
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Ping Gao
- Department of Endocrinology and Metabolism, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Yi Xu
- Department of Hepatopancreatobiliary Surgery, Second Affiliated Hospital of Harbin Medical University, Harbin, China.,The Key Laboratory of Myocardial Ischemia, Harbin Medical University, Ministry of Education, Harbin, China
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Ren K, Jiang T, Zhou HF, Liang Y, Zhao GJ. Apigenin Retards Atherogenesis by Promoting ABCA1-Mediated Cholesterol Efflux and Suppressing Inflammation. Cell Physiol Biochem 2018; 47:2170-2184. [PMID: 29975943 DOI: 10.1159/000491528] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Accepted: 05/04/2018] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND/AIMS The development of atherosclerosis is accompanied by escalating inflammation and lipid accumulation within blood vessel walls. ABCA1 plays a crucial role in mediating cholesterol efflux from macrophages, which protects against atherogenesis. This research was designed to explore the effects and underlying mechanisms of apigenin (4', 5, 7-trihydroxyflavone) on ABCA1-mediated cellular cholesterol efflux and LPS-stimulated inflammation in RAW264.7 macrophages and apoE-/- mice. METHODS Expression of genes or proteins was examined by RT-PCR or western blot analysis. Liquid scintillation counting was used to detect percent cholesterol efflux. Cellular cholesterol content was measured using HPLC assay. The secretion levels of pro-inflammatory cytokines were quantified by ELISA assay. Atherosclerotic lesion sizes were determined with Oil Red O staining. The contents of macrophages and smooth muscle cells in atherosclerotic lesion were evaluated using immunohistochemistry. Plasma TC, TG, HDL-C and LDL-C levels in apoE-/- mice were evaluated using commercial test kits. RESULTS Apigenin potently increased ABCA1 expression through miR-33 repression in a dose- and time-dependent manner. Treatment with apigenin significantly increased ABCA1-mediated cholesterol efflux, and reduced TC, FC and CE levels in macrophage-derived foam cells. In LPS-treated macrophages, the expression levels of TLR-4, MyD88 and p-IκB-α as well as nuclear NF-κB p65 were decreased by the addition of apigenin. Moreover, apigenin markedly decreased secretion levels of several pro-inflammatory cytokines. Lastly, in LPS-challenged apoE-/- mice, apigenin administration augmented ABCA1 expression, decreased the contents of macrophages and smooth muscle cells in atherosclerotic lesion, reduced miR-33, TLR-4, and NF-κB p65 levels, improved plasma lipid profile and relieved inflammation, which results in less atherosclerotic lesion size. CONCLUSIONS Taken together, these results suggest that apigenin may attenuate atherogenesis through up-regulating ABCA1-mediated cholesterol efflux and inhibiting inflammation.
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Affiliation(s)
- Kun Ren
- Department of Histology and Embryology, Guilin Medical University, Guilin, China.,Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, China
| | - Ting Jiang
- Department of Histology and Embryology, Guilin Medical University, Guilin, China
| | - Hui-Fang Zhou
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, China
| | - Yin Liang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, China
| | - Guo-Jun Zhao
- Department of Histology and Embryology, Guilin Medical University, Guilin, China
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Wang D, Hiebl V, Ladurner A, Latkolik SL, Bucar F, Heiß EH, Dirsch VM, Atanasov AG. 6-Dihydroparadol, a Ginger Constituent, Enhances Cholesterol Efflux from THP-1-Derived Macrophages. Mol Nutr Food Res 2018; 62:e1800011. [PMID: 29802792 PMCID: PMC6099374 DOI: 10.1002/mnfr.201800011] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 04/24/2018] [Indexed: 01/24/2023]
Abstract
SCOPE Ginger is reported to be used for the prevention and treatment of cardiovascular diseases (CVD). Cholesterol efflux from macrophage foam cells is an important process in reverse cholesterol transport, whose increase may help to prevent or treat CVD. In this study, we investigated the effects of 6-dihydroparadol from ginger on macrophage cholesterol efflux. METHODS AND RESULTS We show that 6-dihydroparadol concentration-dependently enhances both apolipoprotein A1- and human plasma-mediated cholesterol efflux from cholesterol-loaded THP-1-derived macrophages using macrophage cholesterol efflux assay. 6-Dihydroparadol increases protein levels of both ATP-binding cassette transporters A1 and G1 (ATP-binding cassette transporter A1 [ABCA1] and ATP-binding cassette transporter G1 [ABCG1]) according to Western blot analysis. The ABCA1 inhibitor probucol completely abolishes 6-dihydroparadol-enhanced cholesterol efflux. Furthermore, increased ABCA1 protein levels in the presence of 6-dihydroparadol were associated with both increased ABCA1 mRNA levels and increased ABCA1 protein stability. Enhanced ABCG1 protein levels were only associated with increased protein stability. Increased ABCA1 protein stability appeared to be the result of a reduced proteasomal degradation of the transporter in the presence of 6-dihydroparadol. CONCLUSION We identified 6-dihydroparadol from ginger as a novel promoter of cholesterol efflux from macrophages that increases both ABCA1 and ABCG1 protein abundance. This newly identified bioactivity might contribute to the antiatherogenic effects of ginger.
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Affiliation(s)
- Dongdong Wang
- Department of PharmacognosyUniversity of ViennaAlthanstrasse 141090ViennaAustria
- Institute of Genetics and Animal Breeding of the Polish Academy of Sciencesul. Postepu 36A05–552JastrzebiecPoland
- Institute of Clinical ChemistryUniversity Hospital ZurichUniversity of ZurichWagistrasse 148952SchlierenSwitzerland
| | - Verena Hiebl
- Department of PharmacognosyUniversity of ViennaAlthanstrasse 141090ViennaAustria
| | - Angela Ladurner
- Department of PharmacognosyUniversity of ViennaAlthanstrasse 141090ViennaAustria
| | - Simone L. Latkolik
- Department of PharmacognosyUniversity of ViennaAlthanstrasse 141090ViennaAustria
| | - Franz Bucar
- Department of Pharmacognosy, Institute of Pharmaceutical SciencesUniversity of Graz8010GrazAustria
| | - Elke H. Heiß
- Department of PharmacognosyUniversity of ViennaAlthanstrasse 141090ViennaAustria
| | - Verena M. Dirsch
- Department of PharmacognosyUniversity of ViennaAlthanstrasse 141090ViennaAustria
| | - Atanas G. Atanasov
- Department of PharmacognosyUniversity of ViennaAlthanstrasse 141090ViennaAustria
- Institute of Genetics and Animal Breeding of the Polish Academy of Sciencesul. Postepu 36A05–552JastrzebiecPoland
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Abstract
Human Vγ9Vδ2 T cells have the capacity to detect supra-physiological concentrations of phosphoantigens (pAgs) generated by the mevalonate (Mev) pathway of mammalian cells under specific circumstances. Isopentenyl pyrophosphate (IPP) is the prototypic pAg recognized by Vγ9Vδ2 T cells. B-cell derived tumor cells (i.e., lymphoma and myeloma cells) and dendritic cells (DCs) are privileged targets of Vγ9Vδ2 T cells because they generate significant amounts of IPP which can be boosted with zoledronic acid (ZA). ZA is the most potent aminobisphosphonate (NBP) clinically available to inhibit osteoclast activation and a very potent inhibitor of farnesyl pyrophosphate synthase in the Mev pathway. ZA-treated DCs generate and release in the supernatants picomolar IPP concentrations which are sufficient to induce the activation of Vγ9Vδ2 T cells. We have recently shown that the ATP-binding cassette transporter A1 (ABCA1) plays a major role in the extracellular release of IPP from ZA-treated DCs. This novel ABCA1 function is fine-tuned by physical interactions with IPP, apolipoprotein A-I (apoA-I), and butyrophilin-3A1 (BTN3A1). The mechanisms by which soluble IPP induces Vγ9Vδ2 T-cell activation remain to be elucidated. It is possible that soluble IPP binds to BTN3A1, apoA-I, or other unknown molecules on the cell surface of bystander cells like monocytes, NK cells, Vγ9Vδ2 T cells, or any other cell locally present. Investigating this scenario may represent a unique opportunity to further characterize the role of BTN3A1 and other molecules in the recognition of soluble IPP by Vγ9Vδ2 T cells.
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Affiliation(s)
- Chiara Riganti
- Dipartimento di Oncologia, Università degli Studi di Torino, Turin, Italy
| | - Barbara Castella
- Laboratorio di Immunologia dei Tumori del Sangue (LITS), Centro Interdipartimentale di Ricerca in Biologia Molecolare (CIRBM), Università degli Studi di Torino, Turin, Italy
| | - Massimo Massaia
- Laboratorio di Immunologia dei Tumori del Sangue (LITS), Centro Interdipartimentale di Ricerca in Biologia Molecolare (CIRBM), Università degli Studi di Torino, Turin, Italy.,SC Ematologia, AO S. Croce e Carle, Cuneo, Italy
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28
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Gillard BK, Rosales C, Xu B, Gotto AM, Pownall HJ. Rethinking reverse cholesterol transport and dysfunctional high-density lipoproteins. J Clin Lipidol 2018; 12:849-856. [PMID: 29731282 DOI: 10.1016/j.jacl.2018.04.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 03/26/2018] [Accepted: 04/03/2018] [Indexed: 12/31/2022]
Abstract
Human plasma high-density lipoprotein cholesterol concentrations are a negative risk factor for atherosclerosis-linked cardiovascular disease. Pharmacological attempts to reduce atherosclerotic cardiovascular disease by increasing plasma high-density lipoprotein cholesterol have been disappointing so that recent research has shifted from HDL quantity to HDL quality, that is, functional vs dysfunctional HDL. HDL has varying degrees of dysfunction reflected in impaired reverse cholesterol transport (RCT). In the context of atheroprotection, RCT occurs by 2 mechanisms: one is the well-known trans-hepatic pathway comprising macrophage free cholesterol (FC) efflux, which produces early forms of FC-rich nascent HDL (nHDL). Lecithin:cholesterol acyltransferase converts HDL-FC to HDL-cholesteryl ester while converting nHDL from a disc to a mature spherical HDL, which transfers its cholesteryl ester to the hepatic HDL receptor, scavenger receptor B1 for uptake, conversion to bile salts, or transfer to the intestine for excretion. Although widely cited, current evidence suggests that this is a minor pathway and that most HDL-FC and nHDL-FC rapidly transfer directly to the liver independent of lecithin:cholesterol acyltransferase activity. A small fraction of plasma HDL-FC enters the trans-intestinal efflux pathway comprising direct FC transfer to the intestine. SR-B1-/- mice, which have impaired trans-hepatic FC transport, are characterized by high plasma levels of a dysfunctional FC-rich HDL that increases plasma FC bioavailability in a way that produces whole-body hypercholesterolemia and multiple pathologies. The design of future therapeutic strategies to improve RCT will have to be formulated in the context of these dual RCT mechanisms and the role of FC bioavailability.
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Affiliation(s)
- Baiba K Gillard
- Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX, USA; Weill Cornell Medicine, New York, NY, USA
| | - Corina Rosales
- Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX, USA; Weill Cornell Medicine, New York, NY, USA
| | - Bingqing Xu
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha, China
| | - Antonio M Gotto
- Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX, USA; Weill Cornell Medicine, New York, NY, USA
| | - Henry J Pownall
- Center for Bioenergetics, Houston Methodist Research Institute, Houston, TX, USA; Weill Cornell Medicine, New York, NY, USA.
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Yang S, Si L, Fan L, Jian W, Pei H, Lin R. Polysaccharide IV from Lycium barbarum L. Improves Lipid Profiles of Gestational Diabetes Mellitus of Pregnancy by Upregulating ABCA1 and Downregulating Sterol Regulatory Element-Binding Transcription 1 via miR-33. Front Endocrinol (Lausanne) 2018; 9:49. [PMID: 29527188 PMCID: PMC5829030 DOI: 10.3389/fendo.2018.00049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2017] [Accepted: 02/05/2018] [Indexed: 01/24/2023] Open
Abstract
Lycium barbarum L. (LBL) has beneficial effects on gestational diabetes mellitus (GDM) but the related mechanism remains unclear. Polysaccharides of LBL (LBLP) are the main bioactive components of LBL. miR-33, ATP-binding cassette transporter A1 (ABCA1) and sterol regulatory element-binding transcription 1 (SREBF1) affect lipid profiles, which are associated with GDM risk. LBLP may exert protective against GDM by affecting these molecules. Four LBLP fractions: LBLP-I, LBLP-II, LBLP-III, and LBLP-IV were isolated from LBL and further purified by using DEAE-Sephadex column. The effects of purified each fraction on pancreatic beta cells were comparatively evaluated. A total of 158 GDM patients were recruited and randomly divided into LBL group (LG) and placebo group (CG). miR-33 levels, lipid profiles, insulin resistance and secretory functions were measured. The association between serum miR-33 levels and lipid profiles were evaluated by using Spearman's rank-order correlation test. After 4-week therapy, LBL reduced miR-33 level, insulin resistance and increased insulin secretion of GDM patients. LBL increased the levels of ABCA1, high-density lipoprotein cholesterol (HDL-C) and reduced miR-33, SREBF1, low-density lipoprotein cholesterol (LDL-C), total cholesterol (TC), triglyceride (TG), and malondialdehyde. Homeostatic model assessment of β-cell function and insulin resistance was lower in LG than in CG, whereas homeostatic model assessment of β-cell function and insulin secretory function was higher in LG than in CG. There was a strong positive association between miR-33 level and TG, or TC and or LDL-C, and a strong negative association between miR-33 level and HDL-C. The levels of miR-33 had negative relation with ABCA1 and positive relation with SREBF1. ABCA1 has negative relation with TG, TC, and LDL-C and positive relation with HDL-C. Inversely, SREBF1 had positive relation with TG, TC, and LDL-C and negative relation with HDL-C. The main bioactive compound LBLP-IV of LBL increased insulin secretion of beta cells and the levels of ABCA1, and reduced miR-33 levels and SREBF1 in beta cells. However, LBLP-IV could not change the levels of these molecules anymore when miR-33 was overexpressed or silenced. LBLP-IV had the similar effects with LBL on beta cells while other components had no such effects. Thus, LBLP-IV from LBL improves lipid profiles by upregulating ABCA1 and downregulating SREBF1 via miR-33.
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Affiliation(s)
- Shuli Yang
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin University, Changchun, China
| | - Lihui Si
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin University, Changchun, China
| | - Limei Fan
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin University, Changchun, China
| | - Wenwen Jian
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin University, Changchun, China
| | - Huilin Pei
- Department of Gynecology and Obstetrics, The Second Hospital of Jilin University, Changchun, China
| | - Ruixin Lin
- Department of Hepatobiliary and Pancreatic Surgery, The Second Hospital of Jilin University, Changchun, China
- *Correspondence: Ruixin Lin,
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30
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Xiong T, Xu G, Huang XL, Lu KQ, Xie WQ, Yin K, Tu J. ATP-binding cassette transporter A1: A promising therapy target for prostate cancer. Mol Clin Oncol 2017; 8:9-14. [PMID: 29399345 DOI: 10.3892/mco.2017.1506] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Accepted: 11/10/2017] [Indexed: 12/21/2022] Open
Abstract
ATP-binding cassette transporter A1 (ABCA1) has been found to mediate the transfer of cellular cholesterol across the plasma membrane to apolipoprotein A-I (apoA-I), and is essential for the synthesis of high-density lipoprotein. Mutations of the ABCA1 gene may induce Tangier disease and familial hypoalphalipoproteinemia; they may also lead to loss of cellular cholesterol homeostasis in prostate cancer, and increased intracellular cholesterol levels are frequently found in prostate cancer cells. Recent studies have demonstrated that ABCA1 may exert anticancer effects through cellular cholesterol efflux, which has been attracting increasing attention in association with prostate cancer. The aim of the present review was to focus on the current views on prostate cancer progression and the various functions of ABCA1, in order to provide new therapeutic targets for prostate cancer.
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Affiliation(s)
- Ting Xiong
- Institute of Pharmacy and Pharmacology, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Gang Xu
- Department of Diagnostics Teaching and Research, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Xue-Long Huang
- Institute of Pharmacy and Pharmacology, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Kai-Qiang Lu
- Institute of Pharmacy and Pharmacology, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Wei-Quan Xie
- Institute of Pharmacy and Pharmacology, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Kai Yin
- Department of Diagnostics Teaching and Research, University of South China, Hengyang, Hunan 421001, P.R. China
| | - Jian Tu
- Institute of Pharmacy and Pharmacology, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang, Hunan 421001, P.R. China
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31
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Berryman CE, Fleming JA, Kris-Etherton PM. Inclusion of Almonds in a Cholesterol-Lowering Diet Improves Plasma HDL Subspecies and Cholesterol Efflux to Serum in Normal-Weight Individuals with Elevated LDL Cholesterol. J Nutr 2017; 147:1517-1523. [PMID: 28615375 PMCID: PMC5525107 DOI: 10.3945/jn.116.245126] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/27/2017] [Accepted: 05/15/2017] [Indexed: 12/28/2022] Open
Abstract
Background: Almonds may increase circulating HDL cholesterol when substituted for a high-carbohydrate snack in an isocaloric diet, yet little is known about the effects on HDL biology and function.Objective: The objective was to determine whether incorporating 43 g almonds/d in a cholesterol-lowering diet would improve HDL subspecies and function, which were secondary study outcomes.Methods: In a randomized, 2-period, crossover, controlled-feeding study, a diet with 43 g almonds/d (percentage of total energy: 51% carbohydrate, 16% protein, and 32% total and 8% saturated fat) was compared with a similar diet with an isocaloric muffin substitution (58% carbohydrate, 15% protein, and 26% total and 8% saturated fat) in men and women with elevated LDL cholesterol. Plasma HDL subspecies and cholesterol efflux from J774 macrophages to human serum were measured at baseline and after each diet period. Diet effects were examined in all participants (n = 48) and in normal-weight (body mass index: <25; n = 14) and overweight or obese (≥25; n = 34) participants by using linear mixed models.Results: The almond diet, compared with the control diet, increased α-1 HDL [mean ± SEM: 26.7 ± 1.5 compared with 24.3 ± 1.3 mg apolipoprotein A-I (apoA-I)/dL; P = 0.001]. In normal-weight participants, the almond diet, relative to the control diet, increased α-1 HDL (33.7 ± 3.2 compared with 28.4 ± 2.6 mg apoA-I/dL), the α-1 to pre-β-1 ratio [geometric mean (95% CI): 4.3 (3.3, 5.7) compared with 3.1 (2.4, 4.0)], and non-ATP-binding cassette transporter A1 cholesterol efflux (8.3% ± 0.4% compared with 7.8% ± 0.3%) and decreased pre-β-2 (3.8 ± 0.4 compared with 4.6 ± 0.4 mg apoA-I/dL) and α-3 (23.5 ± 0.9 compared with 26.9 ± 1.1 mg apoA-I/dL) HDL (P < 0.05). No diet effects were observed in the overweight or obese group.Conclusions: Substituting almonds for a carbohydrate-rich snack within a lower-saturated-fat diet may be a simple strategy to maintain a favorable circulating HDL subpopulation distribution and improve cholesterol efflux in normal-weight individuals with elevated LDL cholesterol. This trial was registered at clinicaltrials.gov as NCT01101230.
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Affiliation(s)
| | | | - Penny M Kris-Etherton
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA
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Xu Z, Dong A, Feng Z, Li J. Interleukin-32 promotes lipid accumulation through inhibition of cholesterol efflux. Exp Ther Med 2017; 14:947-952. [PMID: 28781617 DOI: 10.3892/etm.2017.4596] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 02/14/2017] [Indexed: 12/15/2022] Open
Abstract
Interleukin-32 (IL-32) is a pro-inflammatory cytokine and its effects in various inflammatory diseases have been investigated. However, the role of IL-32 on atherosclerosis, an inflammatory disease, remains unknown. The present study examined the use of IL-32α, the most abundant transcript of IL-32, in the treatment of oxidized low-density lipoprotein (ox-LDL)-stimulated THP-1 macrophages for 24 h, which simulates a foam cell formation model. The effect of IL-32α (20, 50 and 100 ng/ml) on lipid deposition in the macrophages was analyzed using Oil Red O staining, while the cholesterol efflux on apolipoprotein A-I was also measured. The mRNA and protein expression levels of peroxisome proliferator-activated receptor γ (PPARγ), liver X receptor α (LXRα), ATP-binding cassette transporter A1 (ABCA1) and ABCG1 were quantified by reverse transcription-quantitative polymerase chain reaction and western blot analysis, respectively. The results indicated that IL-32α exposure enhanced the lipid deposition and attenuated the cholesterol efflux from ox-LDL-stimulated THP-1 macrophages in a dose-dependent manner. Furthermore, the expression levels of ABCA1, LXRα and PPARγ were dose-dependently decreased by IL-32α at the mRNA and protein levels. Addition of the PPARγ agonist 15d-PGJ2 or overexpression of PPARγ in THP-1 macrophages abrogated the IL-32α-mediated inhibition of cholesterol efflux and reversed the IL-32α-mediated downregulation of ABCA1 and LXRα. In conclusion, IL-32α enhances lipid accumulation and inhibits cholesterol efflux from ox-LDL-exposed THP-1 macrophages by regulating the PPARγ-LXRα-ABCA1 pathway.
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Affiliation(s)
- Zonglei Xu
- Department of Internal Medicine Cardiovascular Medicine, Liaocheng Development Hospital, Liaocheng, Shandong 252000, P.R. China
| | - Aizhi Dong
- VIP Ward, Shandong Liaocheng No. 2 People's Hospital, Liaocheng, Shandong 252600, P.R. China
| | - Zerui Feng
- Department of Internal Medicine Cardiovascular Medicine, Shandong Liaocheng No. 2 People's Hospital, Liaocheng, Shandong 252600, P.R. China
| | - Jing Li
- Department of Internal Medicine Cardiovascular Medicine, Ankang City Central Hospital, Ankang, Shanxi 725000, P.R. China
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Liang B, Wang X, Song X, Bai R, Yang H, Yang Z, Xiao C, Bian Y. MicroRNA-20a/b regulates cholesterol efflux through post-transcriptional repression of ATP-binding cassette transporter A1. Biochim Biophys Acta Mol Cell Biol Lipids 2017; 1862:929-938. [PMID: 28602962 DOI: 10.1016/j.bbalip.2017.06.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 05/27/2017] [Accepted: 06/07/2017] [Indexed: 12/16/2022]
Abstract
ATP-binding cassette transporter A1 (ABCA1) plays a crucial role in reverse cholesterol transport and exhibits anti-atherosclerosis effects. Some microRNAs (miRs) regulate ABCA1 expression, and recent studies have shown that miR-20a/b might play a critical role in atherosclerotic diseases. Here, we attempted to clarify the potential contribution of miR-20a/b in post-transcriptional regulation of ABCA1, cholesterol efflux, and atherosclerosis. We performed bioinformatics analysis and found that miR-20a/b was highly conserved and directly bound to ABCA1 mRNA with low binding free energy. Luciferase-reporter assay also confirmed that miR-20a/b significantly reduced luciferase activity associated with the ABCA1 3' untranslated region reporter construct. Additionally, miR-20a/b decreased ABCA1 expression, which, in turn, decreased cholesterol efflux and increased cholesterol content in THP-1 and RAW 264.7 macrophage-derived foam cells. In contrast, miR-20a/b inhibitors increased ABCA1 expression and cholesterol efflux, decreased cholesterol content, and inhibited foam-cell formation. Consistent with our in vitro results, miR-20a/b-treated ApoE-/- mice showed decreased ABCA1expression in the liver and reductions of reverse cholesterol transport in vivo. Furthermore, miR-20a/b regulated the formation of nascent high-density lipoprotein and promoted atherosclerotic development, whereas miR-20a/b knockdown attenuated atherosclerotic formation. miR-20 is a new miRNA capable of targeting ABCA1 and regulating ABCA1 expression. Therefore, miR-20 inhibition constitutes a new strategy for ABCA1-based treatment of atherosclerosis.
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Affiliation(s)
- Bin Liang
- Department of Cardiology, The Second Hospital of Shanxi Medical University, 382 Wuyi Road, Taiyuan, China; Key Laboratory of Cardiovascular Medicine and Clinical Pharmacology of Shanxi Province, 382 Wuyi Road, Taiyuan, China
| | - Xin Wang
- Department of Rheumatology, The Second Hospital of Shanxi Medical University, 382 Wuyi Road, Taiyuan, China
| | - Xiaosu Song
- Department of Cardiology, The Second Hospital of Shanxi Medical University, 382 Wuyi Road, Taiyuan, China; Key Laboratory of Cardiovascular Medicine and Clinical Pharmacology of Shanxi Province, 382 Wuyi Road, Taiyuan, China
| | - Rui Bai
- Department of Cardiology, The Second Hospital of Shanxi Medical University, 382 Wuyi Road, Taiyuan, China; Key Laboratory of Cardiovascular Medicine and Clinical Pharmacology of Shanxi Province, 382 Wuyi Road, Taiyuan, China
| | - Huiyu Yang
- Department of Cardiology, The Second Hospital of Shanxi Medical University, 382 Wuyi Road, Taiyuan, China; Key Laboratory of Cardiovascular Medicine and Clinical Pharmacology of Shanxi Province, 382 Wuyi Road, Taiyuan, China
| | - Zhiming Yang
- Department of Cardiology, The Second Hospital of Shanxi Medical University, 382 Wuyi Road, Taiyuan, China; Key Laboratory of Cardiovascular Medicine and Clinical Pharmacology of Shanxi Province, 382 Wuyi Road, Taiyuan, China
| | - Chuanshi Xiao
- Key Laboratory of Cardiovascular Medicine and Clinical Pharmacology of Shanxi Province, 382 Wuyi Road, Taiyuan, China; Department of Cardiology, The First Hospital of Shanxi Medical University, 85 Jiefang South Road, Taiyuan, China
| | - Yunfei Bian
- Department of Cardiology, The Second Hospital of Shanxi Medical University, 382 Wuyi Road, Taiyuan, China; Key Laboratory of Cardiovascular Medicine and Clinical Pharmacology of Shanxi Province, 382 Wuyi Road, Taiyuan, China.
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Abstract
BACKGROUND AND AIMS Pre-β1 HDL, being a major acceptor of free cholesterol from cells, plays an important role in reverse cholesterol transport. This study was performed to determine whether abnormalities in pre-β1 HDL concentration were present in type 2 diabetes irrespective of their HDL-cholesterol levels, and the impact on cholesterol efflux. METHODS 640 type 2 diabetic patients with or without cardiovascular disease (CVD) and 360 non-diabetic controls matched for serum HDL-cholesterol levels were recruited. Plasma pre-β1 HDL was measured by ELISA, and cholesterol efflux to serum, mediated by ATP-binding cassette transporter A1 (ABCA1), was determined by measuring the transfer of [3H]cholesterol from cultured cells expressing ABCA1 to the medium containing the tested serum. RESULTS Despite the diabetic subjects having matched HDL-cholesterol and total apoA1 as controls, plasma pre-β1 HDL was significantly reduced in both male (p < 0.01) and female diabetic patients (p < 0.05), and patients with CVD had the lowest pre-β1 HDL level. Serum capacity to induce ABCA1-mediated cholesterol efflux was impaired in the diabetic group (p < 0.01) and cholesterol efflux correlated with pre-β1 HDL (Pearson's r = 0.38, p < 0.01), and this association remained significantly even after controlling for age, gender, body mass index, diabetes status, smoking, apoA1, triglyceride and LDL. CONCLUSIONS Plasma pre-β1 HDL level was significantly decreased in type 2 diabetes and was associated with a reduction in cholesterol efflux mediated by ABCA1. Our data would suggest that low pre-β1 HDL might cause impairment in reverse cholesterol transport in type 2 diabetes.
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Affiliation(s)
- S W Shiu
- Department of Medicine, University of Hong Kong, Hong Kong
| | - Y Wong
- Department of Medicine, University of Hong Kong, Hong Kong
| | - K C Tan
- Department of Medicine, University of Hong Kong, Hong Kong.
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Dai B, Lei C, Lin R, Tao L, Bin Y, Peng H, Lei B. Activation of liver X receptor α protects amyloid β 1-40 induced inflammatory and senescent responses in human retinal pigment epithelial cells. Inflamm Res 2017; 66:523-534. [PMID: 28361293 DOI: 10.1007/s00011-017-1036-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 03/09/2017] [Accepted: 03/13/2017] [Indexed: 12/21/2022] Open
Abstract
OBJECTIVE To investigate whether activation of the liver X receptors (LXRs) inhibits amyloid β1-40 (Aβ1-40) induced inflammatory and senescent responses in human retinal pigment epithelial (RPE) cells. MATERIALS AND METHODS Confluent cultures of human primary RPE and ARPE-19 cells pretreated with 5 μΜ of TO901317 (TO90), a synthetic agonist of LXR, or vehicle were incubated with 1 μΜ of Aβ1-40 or Aβ40-1. The optimum concentrations of Aβ1-40 and TO90 were determined by cell viability assay. Pro-inflammatory cytokines IL-6, IL-8, MCP-1 were detected by real-time polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA). Expression and localization of an aging protein p16INK4a (p16) were analyzed by western blotting and immunofluorescence. Expressions of LXRs and one of their target genes ATP-binding cassette transporter A1 (ABCA1) were examined by real-time PCR and western blotting. Phosphorylated transcription inhibition factor-κB-α (p-IκB-α) was assessed by western blotting. RESULTS A negative linear relationship between the Aβ1-40 concentration and the cell viability was evident, indicating Aβ1-40 decreased ARPE-19 cell viability in a dose-dependent manner. Aβ1-40 enhanced the expression of IL-6, IL-8, MCP-1 as well as p16 in both RPE cell lines at both mRNA and protein levels, whereas TO90 counteracted the detrimental effects. TO90 upregulated the expression of LXRα and its target gene ABCA1, but it did not affect the expression of LXRβ. Meanwhile, TO90 inhibited the phosphorylation of IκB-α mediated by Aβ1-40 stimulation. CONCLUSION Activation of the LXRα-ABCA1 axis may alleviate Aβ1-40 induced inflammatory and senescent responses in RPE cells. The beneficial effect appears associated with the inhibition of the NF-κB signaling pathway.
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Affiliation(s)
- Bingling Dai
- Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China
| | - Chunyan Lei
- Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China
| | - Ru Lin
- Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China
| | - Lifei Tao
- Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China
| | - Yue Bin
- Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China
| | - Hui Peng
- Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China.
| | - Bo Lei
- Chongqing Key Laboratory of Ophthalmology, Chongqing Eye Institute, The First Affiliated Hospital of Chongqing Medical University, 1 Youyi Road, Chongqing, 400016, China.
- Henan Provincial People's Hospital, Henan Eye Institute, Henan Eye Hospital, People's Hospital of Zhengzhou University, 7 Weiwu Road, Zhengzhou, 450003, China.
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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: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [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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Kolovou V, Marvaki A, Boutsikou M, Vasilopoulos G, Degiannis D, Marvaki C, Kolovou G. Effect of ATP-binding Cassette Transporter A1 (ABCA1) Gene Polymorphisms on Plasma Lipid Variables and Common Demographic Parameters in Greek Nurses. Open Cardiovasc Med J 2016; 10:233-239. [PMID: 27990182 PMCID: PMC5120382 DOI: 10.2174/1874192401610010233] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2015] [Revised: 09/20/2015] [Accepted: 10/22/2015] [Indexed: 12/03/2022] Open
Abstract
Objective: The present study is on line with our previous studies evaluating the influence of ATP-binding cassette transporter A1 (ABCA1) gene polymorphisms on the lipid variables of Greek student-nurses. The current study was undertaken to (1) estimate the influence of variant(s) such as rs2066715 (V825I), R219K, R1587K, I883M of ABCA1 gene on lipid variables and (2) evaluate the effect of all four ABCA1 polymorphisms on common demographic parameters. Methods: The study population involved 432 unrelated nurses (86 men) who were genotyped for ABCA1 polymorphisms and correlated according to lipid variables [total cholesterol (TC), triglycerides (TGs), high density lipoprotein cholesterol (HDL-C), low density lipoprotein cholesterol (LDL-C) and apolipoprotein (apo) A] and demographic parameters (age, gender, BMI, waist circumference). Results: According to lipid variables concentration there was no difference between genotypes and alleles of V825I, R219K and I883M polymorphisms. The LDL-C concentration was 13% lower in RR compared with RK genotype (100.7 vs. 113.9 mg/dl, p=0.013) of R1587K gene polymorphism. In regression analysis the effects of age, gender and only R1587K gene polymorphism on LDL-C concentrations were proved significant. Additionally, LDL-C was increased (by 1.29 mg/dl on average) by every year of increase of age. Moreover, females had lower LDL-C concentrations as compared with males. Conclusion: Findings suggested that only R1587K polymorphism of ABCA1 gene was associated with lipid variables, age, and gender of Greek nurses. These findings may be helpful in assessing the risk factors for premature coronary heart disease and distinct individuals with lower/higher atherosclerotic burden.
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Affiliation(s)
- Vana Kolovou
- Molecular Immunology Laboratory, Onassis Cardiac Surgery Center, Athens, Greece
| | - Apostolia Marvaki
- Molecular Immunology Laboratory, Onassis Cardiac Surgery Center, Athens, Greece
| | - Maria Boutsikou
- Cardiology Department, Onassis Cardiac Surgery Center, Athens, Greece
| | | | - Dimitrios Degiannis
- Molecular Immunology Laboratory, Onassis Cardiac Surgery Center, Athens, Greece
| | - Christina Marvaki
- Department of Nursing, A' Technological Educational Institute of Athens, Greece
| | - Genovefa Kolovou
- Cardiology Department, Onassis Cardiac Surgery Center, Athens, Greece
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Schreurs BG, Sparks DL. Dietary high cholesterol and trace metals in the drinking water increase levels of ABCA1 in the rabbit hippocampus and temporal cortex. J Alzheimers Dis 2016; 49:201-9. [PMID: 26444796 DOI: 10.3233/jad-150601] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Cholesterol-fed rabbits have been documented to show increased amyloid-β (Aβ) deposits in the brain that can be exacerbated by the quality of drinking water especially if rabbits drink tap water or distilled water containing copper. One mechanism of cholesterol and Aβ clearance may be through the ATP-binding cassette transporter A1 (ABCA1). OBJECTIVE AND METHODS Using an ABCA1 antibody, we determined the number of ABCA1-immunopositive neurons in three areas of rabbit brain as a function of feeding 2% cholesterol and providing tap water, distilled water, or distilled water to which aluminum, copper, or zinc was added. RESULTS The number of neurons with ABCA1 immunoreactivity was increased significantly as a result of dietary cholesterol in the rabbit hippocampus and inferior and superior temporal cortex. The number of neurons with ABCA1 immunoreactivity was further increased in all three areas as a result of cholesterol-fed rabbits drinking tap water or distilled water with copper. Finally, cholesterol-fed rabbits that drank distilled water with aluminum also showed an increased number of ABCA1-immunopositive neurons in inferior and superior temporal cortex. CONCLUSIONS These data suggest that ABCA1 levels increase in parallel with previously documented increases in Aβ levels as a result of high dietary cholesterol and copper in the drinking water. Addition of aluminum to distilled water may have a similar effect in the temporal cortex. ABCA1 has been proposed as a means of clearing Aβ from the brain and manipulations that increase Aβ also result in an increase of clearance machinery.
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Affiliation(s)
- Bernard G Schreurs
- West Virginia University and Blanchette Rockefeller Neurosciences Institute, Morgantown, WV, USA
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Li G, Kim C, Kim J, Yoon H, Zhou H, Kim J. Common Pesticide, Dichlorodiphenyltrichloroethane (DDT), Increases Amyloid-β Levels by Impairing the Function of ABCA1 and IDE: Implication for Alzheimer's Disease. J Alzheimers Dis 2016; 46:109-22. [PMID: 25720399 DOI: 10.3233/jad-150024] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
While early-onset familial Alzheimer's disease (AD) is caused by a genetic mutation, the vast majority of late-onset AD is likely caused by the combination of genetic and environmental factors. Unlike genetic studies, potential environmental factors affecting AD pathogenesis have not yet been thoroughly investigated. Among environmental factors, pesticides seem to be one of critical environmental contributors to late-onset AD. Recent studies reported that the serum and brains of AD patients have dramatically higher levels of a metabolite of dichlorodiphenyltrichloroethane (DDT). While these epidemiological studies provided initial clues to the environmental risks potentially contributing to disease pathogenesis, a functional approach is required to determine whether they actually have a causal role in disease development. In our study, we addressed this critical knowledge gap by investigating possible mechanisms by which DDT affects amyloid-β (Aβ) levels. We treated H4-AβPPswe or H4 cells with DDT to analyze its effect on Aβ metabolism using Aβ production, clearance, and degradation assays. We found that DDT significantly increased the levels of amyloid-β protein precursor (AβPP) and β-site AβPP-cleaving enzyme1 (BACE1), affecting Aβ synthesis pathway in H4-AβPPswe cells. Additionally, DDT impaired the clearance and extracellular degradation of Aβ peptides. Most importantly, we identified for the first time that ATP-binding cassette transporter A1 (ABCA1) and insulin-degrading enzyme (IDE) are the downstream target genes adversely affected by DDT. Our findings provide insight into the molecular mechanisms by which DDT exposure may increase the risk of AD, and it further supports that ABCA1 and IDE may be potential therapeutic targets.
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Affiliation(s)
- Gongbo Li
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China.,Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, FL, USA
| | - Chaeyoung Kim
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, FL, USA
| | - Jaekwang Kim
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, FL, USA
| | - Hyejin Yoon
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, FL, USA.,Neurobiology of Disease Graduate Program, Mayo Graduate School, Jacksonville, FL, USA
| | - Huadong Zhou
- Department of Neurology, Daping Hospital, Third Military Medical University, Chongqing, China
| | - Jungsu Kim
- Department of Neuroscience, Mayo Clinic College of Medicine, Jacksonville, FL, USA.,Neurobiology of Disease Graduate Program, Mayo Graduate School, Jacksonville, FL, USA
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Liu D, Zhang M, Xie W, Lan G, Cheng HP, Gong D, Huang C, Lv YC, Yao F, Tan YL, Li L, Zheng XL, Tang CK. MiR-486 regulates cholesterol efflux by targeting HAT1. Biochem Biophys Res Commun 2015; 472:418-24. [PMID: 26654953 DOI: 10.1016/j.bbrc.2015.11.128] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 11/27/2015] [Indexed: 12/21/2022]
Abstract
RATIONALE Excessive cholesterol accumulation in macrophages is a major factor of foam cell formation and development of atherosclerosis. Previous studies suggested that miR-486 plays an important role in cardiovascular diseases, but the underlying mechanism is still unknown. OBJECTIVE The purpose of this study is to determine whether miR-486 regulates ATP-binding cassette transporter A1 (ABCA1) mediated cholesterol efflux, and also explore the underlying mechanism. METHODS AND RESULTS Based on bioinformatics analysis and luciferase reporter assay, we transfected miR-486 mimic and miR-486 inhibitor into THP-1 macrophage-derived foam cells, and found that miR-486 directly bound to histone acetyltransferase-1 (HAT1) 3'UTR, and downregulated its mRNA and protein expression. In addition, our studies through transfection with wildtype HAT1 or shHAT1 (short hairpin HAT1) revealed that HAT1 could promote the expression of ABCA1 at both mRNA and protein levels. At the same time, the acetylation levels of the lysines 5 and 12 of histone H4 were upregulated after overexpression with HAT1. Meanwhile, the results of liquid scintillation counter and high performance liquid chromatography (HPLC) showed that miR-486 promoted cholesterol accumulation in THP-1 macrophages. CONCLUSION These data indicated that miR-486 aggravate the cholesterol accumulation in THP-1 cells by targeting HAT1.
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Affiliation(s)
- Dan Liu
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Min Zhang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Wei Xie
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Gang Lan
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Hai-Peng Cheng
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Duo Gong
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Chong Huang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Yun-Cheng Lv
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Feng Yao
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Yu-Lin Tan
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Liang Li
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China
| | - Xi-Long Zheng
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, Libin Cardiovascular Institute of Alberta, University of Calgary, Health Sciences Center, 3330 Hospital Dr NW, Calgary T2N 4N1, Alberta, Canada
| | - Chao-Ke Tang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Medical Research Center, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, University of South China, Hengyang 421001, Hunan, China.
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Nordestgaard LT, Tybjærg-Hansen A, Nordestgaard BG, Frikke-Schmidt R. Loss-of-function mutation in ABCA1 and risk of Alzheimer's disease and cerebrovascular disease. Alzheimers Dement 2015; 11:1430-1438. [PMID: 26079414 DOI: 10.1016/j.jalz.2015.04.006] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 03/23/2015] [Accepted: 04/16/2015] [Indexed: 01/01/2023]
Abstract
INTRODUCTION The adenosine triphosphate-binding cassette transporter A1 (ABCA1) is a major cholesterol transporter highly expressed in the liver and brain. In the brain, ABCA1 lipidates apolipoprotein E (apoE), facilitates clearance of amyloid-β, and may be involved in maintenance of the blood-brain barrier via apoE-mediated pathways. METHODS We tested whether a loss-of-function mutation in ABCA1, N1800H, is associated with plasma levels of apoE and with risk of Alzheimer's disease (AD) in 92,726 individuals and with risk of cerebrovascular disease in 64,181 individuals. RESULTS N1800H AC (0.2%) versus AA (99.8%) was associated with a 13% lower plasma level of apoE (P = 1 × 10(-11)). Multifactorially adjusted hazard ratios for N1800H AC versus AA were 4.13 (95% confidence interval, 1.32-12.9) for AD, 2.46 (1.10-5.50) for cerebrovascular disease, and 8.28 (2.03-33.7) for the hemorrhagic stroke subtype. DISCUSSION A loss-of-function mutation in ABCA1, present in 1:500 individuals, was associated with low plasma levels of apoE and with high risk of AD and cerebrovascular disease in the general population.
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Affiliation(s)
- Liv Tybjærg Nordestgaard
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen University Hospitals, Copenhagen, Denmark
| | - Anne Tybjærg-Hansen
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen University Hospitals, Copenhagen, Denmark; The Copenhagen General Population Study, Herlev Hospital, Copenhagen University Hospitals, Herlev, Denmark; Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Børge G Nordestgaard
- The Copenhagen General Population Study, Herlev Hospital, Copenhagen University Hospitals, Herlev, Denmark; Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark; Department of Clinical Biochemistry, Herlev Hospital, Copenhagen University Hospitals, Herlev, Denmark
| | - Ruth Frikke-Schmidt
- Department of Clinical Biochemistry, Rigshospitalet, Copenhagen University Hospitals, Copenhagen, Denmark; The Copenhagen General Population Study, Herlev Hospital, Copenhagen University Hospitals, Herlev, Denmark; Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
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Zhang N, Lei J, Lei H, Ruan X, Liu Q, Chen Y, Huang W. MicroRNA-101 overexpression by IL-6 and TNF-α inhibits cholesterol efflux by suppressing ATP-binding cassette transporter A1 expression. Exp Cell Res 2015; 336:33-42. [PMID: 26033364 DOI: 10.1016/j.yexcr.2015.05.023] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2014] [Revised: 05/24/2015] [Accepted: 05/27/2015] [Indexed: 11/16/2022]
Abstract
BACKGROUND MicroRNAs play key roles in regulating cholesterol homeostasis. Here, we investigated the role of microRNA-101 (miR-101) in regulating ATP-binding cassette transporter A1 (ABCA1) expression and cholesterol efflux under non-inflammatory and inflammatory conditions in human THP-1-derived macrophages and HepG2 hepatoblastoma cells. METHODS The cell lines were transfected with one of four lentiviral vectors: miR-101, miR-101 control, anti-miR-101, or anti-miR-101 control. A luciferase reporter assay was used to examine miR-101 binding to the 3' untranslated region (UTR) of ABCA1. Western blotting was conducted to assess ABCA1 protein expression. Cells were loaded with BODIPY-cholesterol and stained with oil red O to assess cholesterol efflux. RESULTS The luciferase activity assay revealed that wild-type miR-101 binding at site 2 significantly repressed ABCA1 3' UTR activity, suggesting that miR-101 directly targets the ABCA1 mRNA at site 2. In both cell lines, Western blotting revealed that miR-101 expression negatively regulates ABCA1 protein expression and significantly suppresses cholesterol efflux to ApoA1 under both low-density lipoprotein (LDL) and non-LDL conditions, which was confirmed by pronounced lipid inclusions visible by oil red O staining. In HepG2 cells, both IL-6 and TNF-α treatments produced significant miR-101 overexpression; however, in THP-1-derived macrophages, only IL-6 treatment produced significant miR-101 overexpression. Anti-mir-101 transfection under both IL-6 and TNF-α treatment conditions led to ABCA1 upregulation, indicating that miR-101 expression represses ABCA1 expression under inflammatory conditions. CONCLUSIONS miR-101 promotes intracellular cholesterol retention under inflammatory conditions through suppressing ABCA1 expression and suggests that the miR-101-ABCA1 axis may play an intermediary role in the development of NAFLD and vascular atherosclerosis.
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Affiliation(s)
- Nan Zhang
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - JiaYan Lei
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Han Lei
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
| | - Xiongzhong Ruan
- Centre for Lipid Research, Key Laboratory of Metabolism on Lipid and Glucose, Chongqing Medical University, Chongqing, China; John Moorhead Research Laboratory, Centre for Nephrology, University College London Medical School, Royal Free Campus, London, United Kingdom
| | - Qing Liu
- Centre for Clinical Research, The First Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Yaxi Chen
- Centre for Lipid Research, Key Laboratory of Metabolism on Lipid and Glucose, Chongqing Medical University, Chongqing, China
| | - Wei Huang
- Department of Cardiology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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Luthi AJ, Lyssenko NN, Quach D, McMahon KM, Millar JS, Vickers KC, Rader DJ, Phillips MC, Mirkin CA, Thaxton CS. Robust passive and active efflux of cellular cholesterol to a designer functional mimic of high density lipoprotein. J Lipid Res 2015; 56:972-85. [PMID: 25652088 PMCID: PMC4409287 DOI: 10.1194/jlr.m054635] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 02/04/2015] [Indexed: 01/29/2023] Open
Abstract
The ability of HDL to support macrophage cholesterol efflux is an integral part of its atheroprotective action. Augmenting this ability, especially when HDL cholesterol efflux capacity from macrophages is poor, represents a promising therapeutic strategy. One approach to enhancing macrophage cholesterol efflux is infusing blood with HDL mimics. Previously, we reported the synthesis of a functional mimic of HDL (fmHDL) that consists of a gold nanoparticle template, a phospholipid bilayer, and apo A-I. In this work, we characterize the ability of fmHDL to support the well-established pathways of cellular cholesterol efflux from model cell lines and primary macrophages. fmHDL received cell cholesterol by unmediated (aqueous) and ABCG1- and scavenger receptor class B type I (SR-BI)-mediated diffusion. Furthermore, the fmHDL holoparticle accepted cholesterol and phospholipid by the ABCA1 pathway. These results demonstrate that fmHDL supports all the cholesterol efflux pathways available to native HDL and thus, represents a promising infusible therapeutic for enhancing macrophage cholesterol efflux. fmHDL accepts cholesterol from cells by all known pathways of cholesterol efflux: unmediated, ABCG1- and SR-BI-mediated diffusion, and through ABCA1.
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Affiliation(s)
- Andrea J. Luthi
- Department of Chemistry Northwestern University, Evanston, IL 60208
| | - Nicholas N. Lyssenko
- Lipid Research Group, Division of Gastroenterology, Hepatology, and Nutrition, Children’s Hospital of Philadelphia Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
- Division of Translational Medicine and Human Genetics, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
| | - Duyen Quach
- Lipid Research Group, Division of Gastroenterology, Hepatology, and Nutrition, Children’s Hospital of Philadelphia Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
- Division of Translational Medicine and Human Genetics, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
| | - Kaylin M. McMahon
- Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, IL 60611
- Walter S. and Lucienne Driskill Graduate Training Program in Life Sciences, Northwestern University, Chicago, IL 60611
- Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611
| | - John S. Millar
- Division of Translational Medicine and Human Genetics, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
| | - Kasey C. Vickers
- Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Daniel J. Rader
- Division of Translational Medicine and Human Genetics, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
| | - Michael C. Phillips
- Lipid Research Group, Division of Gastroenterology, Hepatology, and Nutrition, Children’s Hospital of Philadelphia Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
- Division of Translational Medicine and Human Genetics, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104
| | - Chad A. Mirkin
- Department of Chemistry Northwestern University, Evanston, IL 60208
- International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208
| | - C. Shad Thaxton
- International Institute for Nanotechnology, Northwestern University, Evanston, IL 60208
- Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611
- Simpson Querrey Institute for BioNanotechnology and Medicine, Northwestern University, Chicago, IL 60611
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Liang B, Wang X, Guo X, Yang Z, Bai R, Liu M, Xiao C, Bian Y. Adiponectin upregulates ABCA1 expression through liver X receptor alpha signaling pathway in RAW 264.7 macrophages. Int J Clin Exp Pathol 2015; 8:450-457. [PMID: 25755733 PMCID: PMC4348878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 12/22/2014] [Indexed: 06/04/2023]
Abstract
ATP-binding cassette transporter A1 (ABCA1) plays a crucial role in reverse cholesterol transport and anti-atherosclerosis. Liver X receptor alpha (LXRα) can stimulate cholesterol efflux through ABCA1. It has been well known that adiponectin has cardiovascular protection. In this study, we attempted to clarify the effect of adiponectin on expression of ABCA1, and explored the role of LXRα in the regulation of ABCA1 in RAW 264.7 macrophages. Our results showed that adiponectin increased ABCA1 expression at both the mRNA and protein levels in a dose-dependent and time-dependent manner. Consequently, adiponectin promoted cholesterol efflux and decreased cholesterol content in RAW 264.7 macrophages. Moreover, adiponectin up-regulated the expression of LXRα in a dose-dependent and time-dependent manner in RAW 264.7 macrophages. LXRα small interfering RNA completely abolished the promotion effects of adiponectin. In summary, adiponectin up-regulates ABCA1 expression via the LXRα pathway in RAW 264.7 macrophages. This novel insight could prove useful for developing new treatment strategies for cardiovascular diseases.
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Affiliation(s)
- Bin Liang
- Department of Cardiology, Second Hospital of Shanxi Medical University382 Wuyi Road, Taiyuan, China
| | - Xin Wang
- Department of Rheumatology, Second Hospital of Shanxi Medical University382 Wuyi Road, Taiyuan, China
| | - Xiaohong Guo
- Department of Cardiology, First Hospital of Shanxi Medical University85 Jiefang South Road, Taiyuan, China
| | - Zhiming Yang
- Department of Cardiology, Second Hospital of Shanxi Medical University382 Wuyi Road, Taiyuan, China
| | - Rui Bai
- Department of Cardiology, Second Hospital of Shanxi Medical University382 Wuyi Road, Taiyuan, China
| | - Ming Liu
- Department of Cell Biology and Genetics, Shanxi Medical University56 Xinjian South Road, Taiyuan, China
| | - Chuanshi Xiao
- Department of Cardiology, First Hospital of Shanxi Medical University85 Jiefang South Road, Taiyuan, China
| | - Yunfei Bian
- Department of Cardiology, Second Hospital of Shanxi Medical University382 Wuyi Road, Taiyuan, China
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Wang C, Shi C, Yang X, Yang M, Sun H, Wang C. Celastrol suppresses obesity process via increasing antioxidant capacity and improving lipid metabolism. Eur J Pharmacol 2014; 744:52-8. [PMID: 25300680 DOI: 10.1016/j.ejphar.2014.09.043] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 09/24/2014] [Accepted: 09/25/2014] [Indexed: 10/24/2022]
Abstract
High fat diet, as an important risk factor, plays a pivotal role in atherosclerotic process. Celastrol is one of the active triterpenoid compounds with antioxidative and anti-inflammatory characters. The aims of this study were to evaluate the effect of celastrol on weight, blood lipid and oxidative injury induced by high fat emulsion, and investigate its potential pharmacological mechanisms. Male Sprague-Dawley rats were fed with high fat emulsion for 6 wk to mimic high fat mediated oxidative injury. The effects of celastrol on weight and blood lipid were evaluated, and its mechanisms were disclosed by applying western blot, ELISA and assay kits. Long-term consumption of high fat emulsion could significantly increase weight by enhancing total cholesterol (TC), triacylglycerol (TG), apolipoprotein B (Apo B), low-density lipoprotein cholesterol (LDL-c) levels, attenuating ATP-binding cassette transporter A1 (ABCA1) expression, and decreasing the levels of high-density lipoprotein cholesterol (HDL-c) and apolipoprotein A-I (Apo A-I), and inhibit antioxidant enzymes activities, improve nicotinamide adenine dinucleotide phosphate (NADPH) oxidase activity. Comparing with model group, celastrol was able to effectively suppress weight and attenuate high fat mediated oxidative injury by improving ABCA1 expression, reducing the levels of TC, TG, LDL-c and Apo B in plasma, and increasing antioxidant enzymes activities and inhibiting NADPH oxidase activity, and decreasing the serum levels of Malondialdehyde (MDA) and reactive oxygen species in dose-dependent way. These data demonstrated that celastrol was able to effectively suppress weight and alleviate high-fat mediated cardiovascular injury via mitigating oxidative stress and improving lipid metabolism.
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Affiliation(s)
- Chaoyun Wang
- School of Pharmaceutical Sciences, Binzhou Medical University, Yantai, Shandong 264003, PR China
| | - Chunfeng Shi
- School of Pharmaceutical Sciences, Binzhou Medical University, Yantai, Shandong 264003, PR China
| | - Xiaoping Yang
- School of Pharmaceutical Sciences, Binzhou Medical University, Yantai, Shandong 264003, PR China
| | - Ming Yang
- School of Pharmaceutical Sciences, Binzhou Medical University, Yantai, Shandong 264003, PR China
| | - Hongliu Sun
- School of Pharmaceutical Sciences, Binzhou Medical University, Yantai, Shandong 264003, PR China
| | - Chunhua Wang
- School of Pharmaceutical Sciences, Binzhou Medical University, Yantai, Shandong 264003, PR China.
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Fu H, Tang YY, Ouyang XP, Tang SL, Su H, Li X, Huang LP, He M, Lv YC, He PP, Yao F, Tan YL, Xie W, Zhang M, Wu J, Li Y, Chen K, Liu D, Lan G, Zeng MY, Zheng XL, Tang CK. Interleukin-27 inhibits foam cell formation by promoting macrophage ABCA1 expression through JAK2/STAT3 pathway. Biochem Biophys Res Commun 2014; 452:881-7. [PMID: 25194807 DOI: 10.1016/j.bbrc.2014.08.120] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 08/23/2014] [Indexed: 12/24/2022]
Abstract
The purpose of this study is to determine whether IL-27 regulates macrophage ABCA1 expression, foam cell formation, and also explore the underlying mechanisms. Here, we revealed that IL-27 decreased lipid accumulation in THP-1 derived macrophages through markedly enhancing cholesterol efflux and increasing ABCA1 expression at both protein and mRNA levels. Our study further demonstrated that IL-27 increased ABCA1 level via activation of signal transducer and activator of transcription 3 (STAT3). Inhibition of Janus kinase 2, (JAK2)/STAT3 suppressed the stimulatory effects of IL-27 on ABCA1 expression. The present study concluded that IL-27 reduces lipid accumulation of foam cell by upregulating ABCA1 expression via JAK2/STAT3. Therefore, targeting IL-27 may offer a promising strategy to treat atherosclerotic vascular disease.
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Affiliation(s)
- Hui Fu
- Department of ICU, First Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Yan-Yan Tang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Xin-Ping Ouyang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Shi-Lin Tang
- Department of ICU, First Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Hua Su
- Department of ICU, First Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Xiaotao Li
- Department of ICU, First Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Li-Ping Huang
- Department of ICU, First Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Miao He
- Department of ICU, First Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Yun-Cheng Lv
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Ping-Ping He
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Feng Yao
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Yu-Lin Tan
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Wei Xie
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Min Zhang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Jianfeng Wu
- Department of Cardiovascular Medicine, Second Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Yuan Li
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Kong Chen
- Department of Cardiovascular Medicine, Second Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Dan Liu
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Gang Lan
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China
| | - Meng-Ya Zeng
- Department of Cardiovascular Medicine, Second Affiliated Hospital of University of South China, Hengyang 421001, Hunan, China
| | - Xi-Long Zheng
- Department of Biochemistry and Molecular Biology, The Libin Cardiovascular Institute of Alberta, The University of Calgary, Health Sciences Center, 3330 Hospital Dr. NW, Calgary, Alberta T2N 4N1, Canada
| | - Chao-Ke Tang
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China.
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Guay SP, Légaré C, Houde AA, Mathieu P, Bossé Y, Bouchard L. Acetylsalicylic acid, aging and coronary artery disease are associated with ABCA1 DNA methylation in men. Clin Epigenetics 2014; 6:14. [PMID: 25093045 PMCID: PMC4120725 DOI: 10.1186/1868-7083-6-14] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 07/17/2014] [Indexed: 11/30/2022] Open
Abstract
Background Previous studies have suggested that DNA methylation contributes to coronary artery disease (CAD) risk variability. DNA hypermethylation at the ATP-binding cassette transporter A1 (ABCA1) gene, an important modulator of high-density lipoprotein cholesterol and reverse cholesterol transport, has been previously associated with plasma lipid levels, aging and CAD, but the association with CAD has yet to be replicated. Results ABCA1 DNA methylation levels were measured in leucocytes of 88 men using bis-pyrosequencing. We first showed that DNA methylation at the ABCA1 gene promoter locus is associated with aging and CAD occurrence in men (P < 0.05). The latter association is stronger among older men with CAD (≥61 years old; n = 19), who showed at least 4.7% higher ABCA1 DNA methylation levels as compared to younger men with CAD (<61 years old; n = 19) or men without CAD (n = 50; P < 0.001). Higher ABCA1 DNA methylation levels in older men were also associated with higher total cholesterol (r = 0.34, P = 0.03), low-density lipoprotein cholesterol (r = 0.32, P = 0.04) and triglyceride levels (r = 0.26, P = 0.09). Furthermore, we showed that acetylsalicylic acid therapy is associated with 3.6% lower ABCA1 DNA methylation levels (P = 0.006), independent of aging and CAD status of patients. Conclusions This study provides new evidence that the ABCA1 epigenetic profile is associated with CAD and aging, and highlights that epigenetic modifications might be a significant molecular mechanism involved in the pathophysiological processes associated with CAD. Acetylsalicylic acid treatment for CAD prevention might involve epigenetic mechanisms.
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Affiliation(s)
- Simon-Pierre Guay
- Department of Biochemistry, Faculté de médecine et des sciences de la santé, de l'Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5 N4, Canada ; ECOGENE-21 and Lipid Clinic, Chicoutimi Hospital, 305 rue St-Vallier, Saguenay, Québec G7H5H6, Canada
| | - Cécilia Légaré
- Department of Biochemistry, Faculté de médecine et des sciences de la santé, de l'Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5 N4, Canada ; ECOGENE-21 and Lipid Clinic, Chicoutimi Hospital, 305 rue St-Vallier, Saguenay, Québec G7H5H6, Canada
| | - Andrée-Anne Houde
- Department of Biochemistry, Faculté de médecine et des sciences de la santé, de l'Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5 N4, Canada ; ECOGENE-21 and Lipid Clinic, Chicoutimi Hospital, 305 rue St-Vallier, Saguenay, Québec G7H5H6, Canada
| | - Patrick Mathieu
- Centre de Recherche Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, 2725 chemin Ste-Foy, Québec, Québec G1V 4G5, Canada
| | - Yohan Bossé
- Centre de Recherche Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, 2725 chemin Ste-Foy, Québec, Québec G1V 4G5, Canada ; Department of Molecular Medicine, Université Laval, 2325 rue de l'Université, Québec, Québec G1V 0A6, Canada
| | - Luigi Bouchard
- Department of Biochemistry, Faculté de médecine et des sciences de la santé, de l'Université de Sherbrooke, 3001 12e Avenue Nord, Sherbrooke, Québec J1H 5 N4, Canada ; ECOGENE-21 and Lipid Clinic, Chicoutimi Hospital, 305 rue St-Vallier, Saguenay, Québec G7H5H6, Canada
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Varela LM, Ortega-Gomez A, Lopez S, Abia R, Muriana FJG, Bermudez B. The effects of dietary fatty acids on the postprandial triglyceride-rich lipoprotein/apoB48 receptor axis in human monocyte/macrophage cells. J Nutr Biochem 2014; 24:2031-9. [PMID: 24231096 DOI: 10.1016/j.jnutbio.2013.07.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Revised: 06/10/2013] [Accepted: 07/03/2013] [Indexed: 12/26/2022]
Abstract
Intestinally produced triglyceride-rich lipoproteins (TRL) play an important role in the progression of atherosclerosis. In this study, we investigated the relevance of monounsaturated fatty acid (MUFA) and saturated fatty acid (SFA) in postprandial TRL in affecting the transcriptional activity of the apolipoprotein-B48 receptor (ApoB48R) and its functionality in human monocyte/macrophage cells. Healthy male volunteers were administered four standardized high-fat meals containing butter, high-palmitic sunflower oil, olive oil (ROO) or a mixture of vegetable and fish oils (50 g/m(2) body surface area) to obtain a panel of postprandial TRL with gradual MUFA oleic acid-to-SFA palmitic acid ratios. The increase in this ratio was linearly associated with a decrease of ApoB48R up-regulation and lipid accumulation in THP-1 and primary monocytes. ApoB48R mRNA levels and intracellular triglycerides were also lower in the monocytes from volunteers after the ingestion of the ROO meal when compared to the ingestion of the butter meal. In THP-1 macrophages, the increase in the MUFA oleic acid-to-SFA palmitic acid ratio in the postprandial TRL was linearly correlated with an increase in ApoB48R down-regulation and a decrease in lipid accumulation. We also revealed that the nuclear receptor transcription factors PPARα, PPARβ/δ, and PPARγ and the PPAR-RXR transcriptional complex were involved in sensing the proportion of MUFA oleic acid and SFA palmitic acid, and these were also involved in adjusting the transcriptional activity of ApoB48R. The results of this study support the notion that MUFA-rich dietary fats may prevent excessive lipid accumulation in monocyte/macrophage cells by targeting the postprandial TRL/ApoB48R axis.
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Affiliation(s)
- Lourdes M Varela
- Laboratory of Cellular and Molecular Nutrition, Instituto de la Grasa (CSIC), 41012 Seville, Spain
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Tsou CY, Chen CY, Zhao JF, Su KH, Lee HT, Lin SJ, Shyue SK, Hsiao SH, Lee TS. Activation of soluble guanylyl cyclase prevents foam cell formation and atherosclerosis. Acta Physiol (Oxf) 2014; 210:799-810. [PMID: 24299003 DOI: 10.1111/apha.12210] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 10/22/2013] [Accepted: 11/28/2013] [Indexed: 12/11/2022]
Abstract
AIMS Soluble guanylyl cyclase (sGC) is a key modulator in the regulation of vascular tone. However, its role and involving mechanism in cholesterol metabolism of macrophages and atherosclerosis remain unclear. METHODS Oil red O staining, Dil-oxidized low-density lipoprotein (oxLDL)-binding assay and cholesterol efflux assay were performed in biology of foam cells. Levels of cytokines or intracellular lipid were evaluated by ELISA or colorimetric kits. Expression of gene or protein was determined by quantitative real-time PCR or Western blotting. Histopathology was examined by haematoxylin and eosin staining. RESULTS Soluble guanylyl cyclase was expressed in macrophages of mouse atherosclerotic lesions. Treatment with 1H-[1, 2, 4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ, sGC inhibitor) exacerbated oxLDL-induced cholesterol accumulation in macrophages. In contrast, 3-(5'-hydroxymethyl-2'furyl)-1-benzyl indazole (YC-1, sGC activator) attenuated the oxLDL-induced cholesterol accumulation because of increased cholesterol efflux. Additionally, YC-1 dose dependently increased the protein expression of ATP-binding cassette transporter A1 (ABCA1) but did not alter that of scavenger receptor class A (SR-A), CD36, SR-BI or ABCG1. Moreover, YC-1-upregulated ABCA1 level depended on liver X receptor α (LXRα). Inhibition of the LXRα-ABCA1 pathway by LXRα small interfering RNA (siRNA), ABCA1 neutralizing antibody or ABCA1 siRNA abolished the effect of YC-1 on cholesterol accumulation and cholesterol efflux. In vivo, YC-1 retarded the development of atherosclerosis, accompanied by reduced serum levels of cholesterol and pro-inflammatory cytokines, in apolipoprotein E-deficient mice. CONCLUSION Activation of sGC by YC-1 leads to LXRα-dependent upregulation of ABCA1 in macrophages and may confer protection against atherosclerosis.
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Affiliation(s)
- C.-Y. Tsou
- Department of Physiology; National Yang-Ming University; Taipei Taiwan
| | - C.-Y. Chen
- Department of Physiology; National Yang-Ming University; Taipei Taiwan
| | - J.-F. Zhao
- Department of Physiology; National Yang-Ming University; Taipei Taiwan
| | - K.-H. Su
- Department of Physiology; National Yang-Ming University; Taipei Taiwan
| | - H.-T. Lee
- Institute of Anatomy and Cell Biology; National Yang-Ming University; Taipei Taiwan
| | - S.-J. Lin
- Division of Cardiology; Department of Internal Medicine; Taipei Veterans General Hospital; Taipei Taiwan
| | - S.-K. Shyue
- Cardiovascular Division; Institute of Biomedical Sciences; Academia Sinica; Taipei Taiwan
| | - S.-H. Hsiao
- Department of Surgery; Ren-Ai Taipei City Hospital; Taipei Taiwan
| | - T.-S. Lee
- Department of Physiology; National Yang-Ming University; Taipei Taiwan
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Endo-Umeda K, Yasuda K, Sugita K, Honda A, Ohta M, Ishikawa M, Hashimoto Y, Sakaki T, Makishima M. 7-Dehydrocholesterol metabolites produced by sterol 27-hydroxylase (CYP27A1) modulate liver X receptor activity. J Steroid Biochem Mol Biol 2014; 140:7-16. [PMID: 24269243 DOI: 10.1016/j.jsbmb.2013.11.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2013] [Revised: 10/26/2013] [Accepted: 11/12/2013] [Indexed: 01/06/2023]
Abstract
7-Dehydrocholesterol (7-DHC) is a common precursor of vitamin D3 and cholesterol. Although various oxysterols, oxygenated cholesterol derivatives, have been implicated in cellular signaling pathways, 7-DHC metabolism and potential functions of its metabolites remain poorly understood. We examined 7-DHC metabolism by various P450 enzymes and detected three metabolites produced by sterol 27-hydroxylase (CYP27A1) using high-performance liquid chromatography. Two were further identified as 25-hydroxy-7-DHC and 26/27-hydroxy-7-DHC. These 7-DHC metabolites were detected in serum of a patient with Smith-Lemli-Opitz syndrome. Luciferase reporter assays showed that 25-hydroxy-7-DHC activates liver X receptor (LXR) α, LXRβ and vitamin D receptor and that 26/27-hydroxy-7-DHC induces activation of LXRα and LXRβ, although the activities of both compounds on LXRs were weak. In a mammalian two-hybrid assay, 25-hydroxy-7-DHC and 26/27-hydroxy-7-DHC induced interaction between LXRα and a coactivator fragment less efficiently than a natural LXR agonist, 22(R)-hydroxycholesterol. These 7-DHC metabolites did not oppose agonist-induced LXR activation and interacted directly to LXRα in a manner distinct from a potent agonist. These findings indicate that the 7-DHC metabolites are partial LXR activators. Interestingly, 25-hydroxy-7-DHC and 26/27-hydroxy-7-DHC suppressed mRNA expression of sterol regulatory element-binding protein 1c, an LXR target gene, in HepG2 cells and HaCaT cells, while they weakly increased mRNA levels of ATP-binding cassette transporter A1, another LXR target, in HaCaT cells. Thus, 7-DHC is catabolized by CYP27A1 to metabolites that act as selective LXR modulators.
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Affiliation(s)
- Kaori Endo-Umeda
- Division of Biochemistry, Department of Biomedical Sciences, Nihon University School of Medicine, Itabashi-ku, Tokyo 173-8610, Japan
| | - Kaori Yasuda
- Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama 939-0398, Japan
| | - Kazuyuki Sugita
- Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Akira Honda
- Joint Research Center, Tokyo Medical University Ibaraki Medical Center, Ami, Ibaraki 300-0395, Japan
| | - Miho Ohta
- Department of Nutrition and Health, Faculty of Human Development, Soai University, Suminoe-ku, Osaka 559-0033, Japan
| | - Minoru Ishikawa
- Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Yuichi Hashimoto
- Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Toshiyuki Sakaki
- Department of Biotechnology, Faculty of Engineering, Toyama Prefectural University, Imizu, Toyama 939-0398, Japan
| | - Makoto Makishima
- Division of Biochemistry, Department of Biomedical Sciences, Nihon University School of Medicine, Itabashi-ku, Tokyo 173-8610, Japan.
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