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Lee H, Yu DM, Bahn MS, Kwon YJ, Um MJ, Yoon SY, Kim KT, Lee MW, Jo SJ, Lee S, Koo SH, Jung KH, Lee JS, Ko YG. Hepatocyte-specific Prominin-1 protects against liver injury-induced fibrosis by stabilizing SMAD7. EXPERIMENTAL & MOLECULAR MEDICINE 2022; 54:1277-1289. [PMID: 36038590 PMCID: PMC9440255 DOI: 10.1038/s12276-022-00831-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 06/01/2022] [Accepted: 06/06/2022] [Indexed: 11/09/2022]
Abstract
Prominin-1 (PROM1), also known as CD133, is expressed in hepatic progenitor cells (HPCs) and cholangiocytes of the fibrotic liver. In this study, we show that PROM1 is upregulated in the plasma membrane of fibrotic hepatocytes. Hepatocellular expression of PROM1 was also demonstrated in mice (Prom1CreER; R26TdTom) in which cells expressed TdTom under control of the Prom1 promoter. To understand the role of hepatocellular PROM1 in liver fibrosis, global and liver-specific Prom1-deficient mice were analyzed after bile duct ligation (BDL). BDL-induced liver fibrosis was aggravated with increased phosphorylation of SMAD2/3 and decreased levels of SMAD7 by global or liver-specific Prom1 deficiency but not by cholangiocyte-specific Prom1 deficiency. Indeed, PROM1 prevented SMURF2-induced SMAD7 ubiquitination and degradation by interfering with the molecular association of SMAD7 with SMURF2. We also demonstrated that hepatocyte-specific overexpression of SMAD7 ameliorated BDL-induced liver fibrosis in liver-specific Prom1-deficient mice. Thus, we conclude that PROM1 is necessary for the negative regulation of TGFβ signaling during liver fibrosis.
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Affiliation(s)
- Hyun Lee
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Dong-Min Yu
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Myeong-Suk Bahn
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Young-Jae Kwon
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Min Jee Um
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Seo Yeon Yoon
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Ki-Tae Kim
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Myoung-Woo Lee
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Sung-Je Jo
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Sungsoo Lee
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Seung-Hoi Koo
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea.,Division of Life Sciences, Korea University, Seoul, 02841, Korea
| | - Ki Hoon Jung
- Department of Surgery, Dongguk University College of Medicine, Gyeongju, 38067, Korea
| | - Jae-Seon Lee
- Research Center for Controlling Intercellular Communication, College of Medicine, Inha University, Incheon, 22212, Korea
| | - Young-Gyu Ko
- Tunneling Nanotube Research Center, Korea University, Seoul, 02841, Korea. .,Division of Life Sciences, Korea University, Seoul, 02841, Korea.
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2
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Korneyenkov MA, Zamyatnin AA. Next Step in Gene Delivery: Modern Approaches and Further Perspectives of AAV Tropism Modification. Pharmaceutics 2021; 13:pharmaceutics13050750. [PMID: 34069541 PMCID: PMC8160765 DOI: 10.3390/pharmaceutics13050750] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 05/14/2021] [Accepted: 05/17/2021] [Indexed: 11/16/2022] Open
Abstract
Today, adeno-associated virus (AAV) is an extremely popular choice for gene therapy delivery. The safety profile and simplicity of the genome organization are the decisive advantages which allow us to claim that AAV is currently among the most promising vectors. Several drugs based on AAV have been approved in the USA and Europe, but AAV serotypes’ unspecific tissue tropism is still a serious limitation. In recent decades, several techniques have been developed to overcome this barrier, such as the rational design, directed evolution and chemical conjugation of targeting molecules with a capsid. Today, all of the abovementioned approaches confer the possibility to produce AAV capsids with tailored tropism, but recent data indicate that a better understanding of AAV biology and the growth of structural data may theoretically constitute a rational approach to most effectively produce highly selective and targeted AAV capsids. However, while we are still far from this goal, other approaches are still in play, despite their drawbacks and limitations.
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Affiliation(s)
- Maxim A. Korneyenkov
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, 119991 Moscow, Russia;
| | - Andrey A. Zamyatnin
- Institute of Molecular Medicine, Sechenov First Moscow State Medical University, 119991 Moscow, Russia
- Department of Biotechnology, Sirius University of Science and Technology, 1 Olympic Ave, 354340 Sochi, Russia
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119992 Moscow, Russia
- Correspondence: ; Tel.: +7-495-622-9843
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3
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Abstract
The prognosis of patients with coronary artery disease and stroke has improved substantially over the last decade as a result of advances in primary and secondary preventive care as well as novel interventional approaches, including the development of drug-eluting stents and balloons. Despite this progress, however, cardiovascular disease remains the leading cause of death in industrialized nations. Sustained efforts to elucidate the underlying mechanisms of atherogenesis, reperfusion-induced cardiac injury, and ischemic heart failure have led to the identification of several target genes as key players in the development and progression of atherosclerotic vascular disease. This knowledge has now enabled genetic therapeutic modulation not only for inherited diseases with a single gene defect, such as familial hypercholesterolemia, but also for multifactorial disorders. This review will focus on approaches in adeno-associated viral (AAV)-mediated gene therapy for atherosclerosis and its long-term sequelae.
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4
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Lagor WR, Johnston JC, Lock M, Vandenberghe LH, Rader DJ. Adeno-associated viruses as liver-directed gene delivery vehicles: focus on lipoprotein metabolism. Methods Mol Biol 2014; 1027:273-307. [PMID: 23912992 DOI: 10.1007/978-1-60327-369-5_13] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Adeno-associated viral vectors have proven to be excellent gene delivery vehicles for somatic overexpression. These viral vectors can efficiently and selectively target the liver, which plays a central role in lipoprotein metabolism. Both liver-expressed as well as non-hepatic secreted proteins can be easily examined in different mouse models using this approach. The dosability of adeno-associated viral (AAV) vectors, as well as their potential for long-term expression, makes them an excellent choice for assessing gene function in vivo. This section will cover the use of AAV to study lipoprotein metabolism-including vector design, virus production and purification, and viral delivery, as well as monitoring of transgene expression and resulting phenotypic changes. Practical information is provided to assist the investigator in designing, interpreting, and troubleshooting experiments.
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Affiliation(s)
- William R Lagor
- Institute for Translational Medicine and Therapeutics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
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5
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Li L, Dimitriadis EK, Yang Y, Li J, Yuan Z, Qiao C, Beley C, Smith RH, Garcia L, Kotin RM. Production and characterization of novel recombinant adeno-associated virus replicative-form genomes: a eukaryotic source of DNA for gene transfer. PLoS One 2013; 8:e69879. [PMID: 23936358 PMCID: PMC3731302 DOI: 10.1371/journal.pone.0069879] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Accepted: 06/13/2013] [Indexed: 01/09/2023] Open
Abstract
Conventional non-viral gene transfer uses bacterial plasmid DNA containing antibiotic resistance genes, cis-acting bacterial sequence elements, and prokaryotic methylation patterns that may adversely affect transgene expression and vector stability in vivo. Here, we describe novel replicative forms of a eukaryotic vector DNA that consist solely of an expression cassette flanked by adeno-associated virus (AAV) inverted terminal repeats. Extensive structural analyses revealed that this AAV-derived vector DNA consists of linear, duplex molecules with covalently closed ends (termed closed-ended, linear duplex, or "CELiD", DNA). CELiD vectors, produced in Sf9 insect cells, require AAV rep gene expression for amplification. Amounts of CELiD DNA produced from insect cell lines stably transfected with an ITR-flanked transgene exceeded 60 mg per 5 × 10(9) Sf9 cells, and 1-15 mg from a comparable number of parental Sf9 cells in which the transgene was introduced via recombinant baculovirus infection. In mice, systemically delivered CELiD DNA resulted in long-term, stable transgene expression in the liver. CELiD vectors represent a novel eukaryotic alternative to bacterial plasmid DNA.
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Affiliation(s)
- Lina Li
- Laboratory of Molecular Virology and Gene Therapy, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Emilios K. Dimitriadis
- National Institute of Biomedical Imaging and Bioengineering, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Yu Yang
- Laboratory of Molecular Virology and Gene Therapy, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Juan Li
- School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Zhenhua Yuan
- School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Chunping Qiao
- School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Cyriaque Beley
- Biotherapies of Neuromuscular Diseases, Faculty of Health Sciences, University of Versailles, Saint-Quentin-en-Yvelines, France
| | - Richard H. Smith
- Laboratory of Molecular Virology and Gene Therapy, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Luis Garcia
- Biotherapies of Neuromuscular Diseases, Faculty of Health Sciences, University of Versailles, Saint-Quentin-en-Yvelines, France
| | - Robert M. Kotin
- Laboratory of Molecular Virology and Gene Therapy, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
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Cotugno G, Annunziata P, Barone MV, Karali M, Banfi S, Auricchio A. Impact of age at administration, lysosomal storage, and transgene regulatory elements on AAV2/8-mediated rat liver transduction. PLoS One 2012; 7:e33286. [PMID: 22428010 PMCID: PMC3302848 DOI: 10.1371/journal.pone.0033286] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Accepted: 02/08/2012] [Indexed: 12/24/2022] Open
Abstract
Liver-directed gene transfer is being investigated for the treatment of systemic or liver-specific diseases. Recombinant vectors based on adeno-associated virus serotype 8 (AAV2/8) efficiently transduce liver cells allowing long term transgene expression after a single administration in animal models and in patients.We evaluated the impact on AAV2/8-mediated rat liver transduction of the following variables: i) age at vector administration, ii) presence of lysosomal storage in liver cells, and iii) regulatory elements included in the transgene expression cassette. We found that systemic administration of AAV2/8 to newborn rats results in vector genome dilution and reduced transduction efficacy when compared to adult injected animals, presumably due to hepatocyte proliferation. Accumulation of glycosaminoglycans in lysosomes does not impact on levels and distribution of AAV2/8-mediated liver transduction. Transgene expression occurs in hepatocytes but not in Kupffer or liver endothelial cells when the liver-specific thyroxine-binding-globulin promoter is used. However, extra-hepatic transduction is observed in the spleen and kidney of animals injected at birth. The use of target sequences for the hematopoietic-specific microRNA miR142-3p does not improve liver transduction efficacy neither reduce immune responses to the lysosomal enzyme arylsulfatase B. The inclusion of a variant of the Woodchuck hepatitis virus post-transcriptional regulatory element (WPRE-m) decreases AAV2/8-mediated liver transduction levels.As AAV2/8-mediated liver gene transfer is entering in the clinical arena, these data will provide relevant information to the design of efficient AAV2/8-based therapeutic strategies.
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Affiliation(s)
- Gabriella Cotugno
- Telethon Institute of Genetics and Medicine, Naples, Italy
- Medical Genetics, Dept. of Pediatrics, “Federico II” University, Naples, Italy
| | - Patrizia Annunziata
- Telethon Institute of Genetics and Medicine, Naples, Italy
- Medical Genetics, Dept. of Pediatrics, “Federico II” University, Naples, Italy
| | - Maria Vittoria Barone
- Department of Pediatrics and European Laboratory for the Investigation of Food-Induced Diseases, “Federico II” University, Naples, Italy
| | | | - Sandro Banfi
- Telethon Institute of Genetics and Medicine, Naples, Italy
- Medical Genetics, Dept. of General Pathology, Second University of Naples, Naples, Italy
| | - Alberto Auricchio
- Telethon Institute of Genetics and Medicine, Naples, Italy
- Medical Genetics, Dept. of Pediatrics, “Federico II” University, Naples, Italy
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Abstract
Twelve AAV serotypes have been described so far in human and nonhuman primate (NHP) populations while surprisingly high diversity of AAV sequences is detected in tissue biopsies. The analysis of these novel AAV sequences has indicated a rapid evolution of the viral genome both by accumulation of mutations and recombination. This chapter describes how this rich resource of naturally evolved sequences is used to derive gene transfer vectors with a wide array of activities depending on the nature of the cap gene used in the packaging system. AAV2-based recombinant genomes have been packaged in dozens of different capsid types, resulting in a wide array of "pseudotyped vectors" that constitute a rich resource for the development of gene therapy clinical trials. We describe a polymerase chain reaction-based molecular rescue method for novel AAV isolation that uses primers designed to recognize the highly conserved regions in known AAV isolates and generate amplicons across the hypervariable regions of novel AAV genomes present in the analyzed sample.
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Adeno-associated Virus Serotype 8 ApoA-I Gene Transfer Reduces Progression of Atherosclerosis in ApoE-KO Mice: Comparison of Intramuscular and Intravenous Administration. J Cardiovasc Pharmacol 2011; 57:325-33. [DOI: 10.1097/fjc.0b013e3182092841] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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9
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Kassim SH, Wilson JM, Rader DJ. Gene therapy for dyslipidemia: a review of gene replacement and gene inhibition strategies. CLINICAL LIPIDOLOGY 2010; 5:793-809. [PMID: 22505953 PMCID: PMC3324780 DOI: 10.2217/clp.10.73] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Despite numerous technological and pharmacological advances and more detailed knowledge of molecular etiologies, cardiovascular diseases remain the leading cause of morbidity and mortality worldwide claiming over 17 million lives a year. Abnormalities in the synthesis, processing and catabolism of lipoprotein particles can result in severe hypercholesterolemia, hypertriglyceridemia or low HDL-C. Although a plethora of antidyslipidemic pharmacological agents are available, these drugs are relatively ineffective in many patients with Mendelian lipid disorders, indicating the need for new and more effective interventions. In vivo somatic gene therapy is one such intervention. This article summarizes current strategies being pursued for the development of clinical gene therapy for dyslipidemias that cannot effectively be treated with existing drugs.
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Affiliation(s)
- Sadik H Kassim
- University of Pennsylvania School of Medicine, Gene Therapy Program, Department of Pathology & Laboratory Medicine, 125 South 31st Street (Suite 2000), PA 19104, USA
| | - James M Wilson
- University of Pennsylvania School of Medicine, Gene Therapy Program, Department of Pathology & Laboratory Medicine, 125 South 31st Street (Suite 2000), PA 19104, USA
| | - Daniel J Rader
- University of Pennsylvania School of Medicine, Gene Therapy Program, Department of Pathology & Laboratory Medicine, 125 South 31st Street (Suite 2000), PA 19104, USA
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10
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Haas MJ, Mooradian AD. Therapeutic Interventions to Enhance Apolipoprotein A-I-Mediated Cardioprotection. Drugs 2010; 70:805-21. [DOI: 10.2165/11535410-000000000-00000] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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11
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Safe and Sustained Overexpression of Functional Apolipoprotein A-I/High-density Lipoprotein in Apolipoprotein A-I–null Mice by Muscular Adeno-associated Viral Serotype 8 Vector Gene Transfer. J Cardiovasc Pharmacol 2009; 54:405-11. [DOI: 10.1097/fjc.0b013e3181bad264] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Vaessen SFC, Veldman RJ, Comijn EM, Snapper J, Sierts JA, van den Oever K, Beattie SG, Twisk J, Kuivenhoven JA. AAV gene therapy as a means to increase apolipoprotein (Apo) A-I and high-density lipoprotein-cholesterol levels: correction of murine ApoA-I deficiency. J Gene Med 2009; 11:697-707. [PMID: 19431216 DOI: 10.1002/jgm.1344] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
BACKGROUND Inherited apolipoprotein (Apo) A-I deficiency is an orphan disorder characterized by high-density lipoprotein (HDL)-cholesterol deficiency and premature atherosclerosis. Constitutive over-expression of ApoA-I might provide a means to treat this disease. The present study provides a comprehensive evaluation of adeno-associated virus (AAV)-mediated ApoA-I gene delivery to express human (h)ApoA-I and correct the low HDL-cholesterol phenotype associated with ApoA-I deficiency. METHODS In an effort to maximize AAV-mediated gene expression, we performed head-to-head comparisons of recombinant AAVs with pseudotype capsids 1, 2, 6 and 8 administered by different routes with the use of five different liver-specific promoters in addition to cytomegalovirus as single-stranded or as self-complementary (sc) AAV vectors. RESULTS Intravenous administration of 1 x 10(13) gc/kg scAAV8, in combination with the liver-specific promoter LP1, in female ApoA-I(-/-) mice resulted in hApoA-I expression levels of 634 +/- 69 mg/l, which persisted for the duration of the study (15 weeks). This treatment resulted in full recovery of HDL-cholesterol levels with correction of HDL particle size and apolipoprotein composition. In addition, we observed increased adrenal cholesterol content and a significant increase in bodyweight in treated mice. CONCLUSIONS The present study demonstrates that systemic delivery of a scAAV8 vector provides a means for efficient liver expression of hApoA-I, thereby correcting the lipid abnormalities associated with murine ApoA-I deficiency. Importantly, the study demonstrates that AAV-based gene therapy can be used to express therapeutic proteins at a high level for a prolonged period of time and, as such, provides a basis for further development of this strategy to treat hApoA-I deficiency.
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Affiliation(s)
- Stefan F C Vaessen
- Department of Experimental Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands
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Alexander ET, Tanaka M, Kono M, Saito H, Rader DJ, Phillips MC. Structural and functional consequences of the Milano mutation (R173C) in human apolipoprotein A-I. J Lipid Res 2009; 50:1409-19. [PMID: 19318685 DOI: 10.1194/jlr.m800578-jlr200] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Carriers of the apolipoprotein A-I(Milano) (apoA-I(M)) variant, R173C, have reduced levels of plasma HDL but no increase in cardiovascular disease. Despite intensive study, it is not clear whether the removal of the arginine or the introduction of the cysteine is responsible for this altered functionality. We investigated this question using two engineered variations of the apoA-I(M) mutation: R173S apoA-I, similar to apoA-I(M) but incapable of forming a disulfide bond, and R173K apoA-I, a conservative mutation. Characterization of the lipid-free proteins showed that the order of stability was wild type approximately R173K>R173S>R173C. Compared with wild-type apoA-I, apoA-I(M) had a lower affinity for lipids, while R173S apoA-I displayed intermediate affinity. The in vivo effects of the apoA-I variants were measured by injecting apoA-I-expressing adeno-associated virus into apoA-I-null mice. Mice that expressed the R173S variant again showed an intermediate phenotype. Thus, both the loss of the arginine and its replacement by a cysteine contribute to the altered properties of apoA-I(M). The arginine is potentially involved in an intrahelical salt bridge with E169 that is disrupted by the loss of the positively charged arginine and repelled by the cysteine, destabilizing the helix bundle domain in the apoA-I molecule and modifying its lipid binding characteristics.
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Affiliation(s)
- Eric T Alexander
- Gastroenterology/Nutrition/Hepatology Division, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-4318, USA
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Weibel GL, Alexander ET, Joshi MR, Rader DJ, Lund-Katz S, Phillips MC, Rothblat GH. Wild-type ApoA-I and the Milano variant have similar abilities to stimulate cellular lipid mobilization and efflux. Arterioscler Thromb Vasc Biol 2007; 27:2022-9. [PMID: 17615385 DOI: 10.1161/atvbaha.107.148403] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE The present study is a comparative investigation of cellular lipid mobilization and efflux to lipid-free human apoA-I and apoA-I(Milano), reconstituted high-density lipoprotein (rHDL) particles containing these proteins and serum isolated from mice expressing human apoA-I or apoA-I(Milano). METHODS AND RESULTS Cholesterol and phospholipid efflux to these acceptors was measured in cell systems designed to assess the contributions of ATP-binding cassette A1 (ABCA1), scavenger receptor type BI (SRBI), and cellular lipid content to cholesterol and phospholipid efflux. Acceptors containing the Milano variant of apoA-I showed no functional increase in lipid efflux in all assays when compared with wild-type apoA-I. In fact, in some systems, acceptors containing the Milano variant of apoA-I promoted significantly less efflux than the acceptors containing wild-type apoA-I (apoA-I(wt)). Additionally, intracellular cholesteryl ester hydrolysis in macrophage foam cells was not different in the presence of either apoA-I(Milano) or apoA-I(wt). CONCLUSION Collectively these studies suggest that if the Milano variant of apoA-I offers greater atheroprotection than wild-type apoA-I, it is not attributable to greater cellular lipid mobilization.
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Affiliation(s)
- Ginny L Weibel
- Division of Gasteroenterology and Nutrition, The Children's Hospital of Philadelphia, Philadelphia, PA 19104-4399, USA.
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15
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Sipo I, Fechner H, Pinkert S, Suckau L, Wang X, Weger S, Poller W. Differential internalization and nuclear uncoating of self-complementary adeno-associated virus pseudotype vectors as determinants of cardiac cell transduction. Gene Ther 2007; 14:1319-29. [PMID: 17611587 DOI: 10.1038/sj.gt.3302987] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Recently it was shown that several new pseudotyped adeno-associated virus (AAV) vectors support cardioselective expression of transgenes. The molecular mechanisms underlying this propensity for cardiac cell transduction are not well understood. We comparatively analyzed AAV vector attachment, internalization, intracellular trafficking, and nuclear uncoating of recombinant self-complementary (sc) AAV2.2 versus pseudotyped scAAV2.6 vectors expressing green fluorescence protein (GFP) in cells of cardiac origin. In cardiac-derived HL-1 cells and primary neonatal rat cardiomyocytes (PNCMs), expression of GFP increased rapidly after incubation with scAAV2.6-GFP, but remained low after scAAV2.2-GFP. Internalization of scAAV2.6-GFP was more efficient than that of scAAV2.2-GFP. Nuclear translocation was similarly efficient for both, but differential nuclear uncoating rates emerged as a key additional determinant of transduction: 30% of all scAAV2.6-GFP genomes translocated to the nucleus became uncoated within 48 h, but only 16% of scAAV2.2-GFP genomes. In contrast to this situation in cells of cardiac origin, scAAV2.2-GFP displayed more efficient internalization and similar (tumor cell line HeLa) or higher (human microvascular endothelial cell (HMEC)) uncoating rates than scAAV.2.6-GFP in non-cardiac cell types. In summary, both internalization and nuclear uncoating are key determinants of cardiac transduction by scAAV2.6 vectors. Any in vitro screening for the AAV pseudotype most suitable for cardiac gene therapy - which is desirable since it may allow significant reductions in vector load in upcoming clinical trials--needs to quantitate both key steps in transduction.
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Affiliation(s)
- I Sipo
- Department of Cardiology & Pneumology, Institute of Infectious Diseases, Campus Benjamin Franklin, Charité - Universitätsmedizin Berlin, Berlin, Germany
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16
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Lebherz C, Sanmiguel J, Wilson JM, Rader DJ. Gene transfer of wild-type apoA-I and apoA-I Milano reduce atherosclerosis to a similar extent. Cardiovasc Diabetol 2007; 6:15. [PMID: 17475009 PMCID: PMC1868709 DOI: 10.1186/1475-2840-6-15] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2007] [Accepted: 05/02/2007] [Indexed: 11/10/2022] Open
Abstract
Background The atheroprotective effects of systemic delivery of either apolipoprotein A-I (wtApoA-I) or the naturally occurring mutant ApoA-I Milano (ApoA-IM) have been established in animal and human trials, but direct comparison studies evaluating the phenotype of ApoA-I or ApoAI-Milano knock-in mice or bone marrow transplantated animals with selectively ApoA-I or ApoAI-Milano transduced macrophages give conflicting results regarding the superior performance of either one. We therefore sought to compare the two forms of apoA-I using liver-directed somatic gene transfer in hypercholesterinemic mice – a model which is most adequately mimicking the clinical setting. Methods and results Vectors based on AAV serotype 8 (AAV2.8) encoding wtApoA-I, ApoA-IM or green fluorescent protein (GFP) as control were constructed. LDL receptor deficient mice were fed a Western Diet. After 8 weeks the AAV vectors were injected, and 6 weeks later atherosclerotic lesion size was determined by aortic en face analysis. Expression of wtApoA-I reduced progression of atherosclerosis by 32% compared with control (p = 0.02) and of ApoA-IM by 24% (p = 0.04). There was no significant difference between the two forms of ApoA-I in inhibiting atherosclerosis progression. Conclusion Liver-directed AAV2.8-mediated gene transfer of wtApoA-I and ApoA-IM each significantly reduced atherosclerosis progression to a similar extent.
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Affiliation(s)
- Corinna Lebherz
- Department of Pathology and Laboratory Medicine, Gene Therapy Program, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
- Department of Cardiology, Ludwig Maximilian University, Munich, Germany
| | - Julio Sanmiguel
- Department of Pathology and Laboratory Medicine, Gene Therapy Program, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - James M Wilson
- Department of Pathology and Laboratory Medicine, Gene Therapy Program, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
| | - Daniel J Rader
- Department of Medicine, Pharmacology, Pathology and Laboratory Medicine, Institute for Translational Medicine and Therapeutics, University of Pennsylvania School of Medicine, Philadelphia, PA, USA
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Xia HB, Chen ZY, Chen XG. Overexpression of hepatitis B virus-binding protein, squamous cell carcinoma antigen 1, extends retention of hepatitis B virus in mouse liver. Acta Biochim Biophys Sin (Shanghai) 2006; 38:484-91. [PMID: 16820864 DOI: 10.1111/j.1745-7270.2006.00190.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
How receptors mediate the entry of hepatitis B virus (HBV) into the target liver cells is poorly understood. Recently, human squamous cell carcinoma antigen 1 (SCCA1) has been found to mediate binding and internalization of HBV to liver-derived cell lines in vitro. In this report, we investigate if SCCA1 is able to function as an HBV receptor and mediate HBV entry into mouse liver. SCCA1 transgene under the control of Rous sarcoma virus promoter was constructed in a minicircle DNA vector that was delivered to NOD/SCID mouse liver using the hydrodynamic technique. Subsequently, HBV-positive human serum was injected intravenously. We demonstrated that approximately 30% of the mouse liver cells expressed a high level of recombined SCCA1 protein for at least 37 d. The HBV surface antigen was found to persist in mouse liver for up to 17 d. Furthermore, HBV genome also persisted in mouse liver, as determined by polymerase chain reaction, for up to 17 d, and in mouse circulation for 7 d. These results suggest that SCAA1 might serve as an HBV receptor or co-receptor and play an important role in mediating HBV entry into hepatocytes, although its role in human HBV infection remains to be determined.
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Affiliation(s)
- Hong-Bin Xia
- Center of Experimental Animals, Sun Yat-Sen University, Guangzhou 510089, China
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