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Issa SS, Shaimardanova AA, Solovyeva VV, Rizvanov AA. Various AAV Serotypes and Their Applications in Gene Therapy: An Overview. Cells 2023; 12:cells12050785. [PMID: 36899921 PMCID: PMC10000783 DOI: 10.3390/cells12050785] [Citation(s) in RCA: 41] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/22/2023] [Accepted: 02/26/2023] [Indexed: 03/06/2023] Open
Abstract
Despite scientific discoveries in the field of gene and cell therapy, some diseases still have no effective treatment. Advances in genetic engineering methods have enabled the development of effective gene therapy methods for various diseases based on adeno-associated viruses (AAVs). Today, many AAV-based gene therapy medications are being investigated in preclinical and clinical trials, and new ones are appearing on the market. In this article, we present a review of AAV discovery, properties, different serotypes, and tropism, and a following detailed explanation of their uses in gene therapy for disease of different organs and systems.
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Affiliation(s)
- Shaza S. Issa
- Department of Genetics and Biotechnology, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Alisa A. Shaimardanova
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Valeriya V. Solovyeva
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
| | - Albert A. Rizvanov
- Institute of Fundamental Medicine and Biology, Kazan Federal University, 420008 Kazan, Russia
- Correspondence: ; Tel.: +7-(905)-3167599
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Tang YW, Stratton CW. The Role of the Human Bocavirus (HBoV) in Respiratory Infections. ADVANCED TECHNIQUES IN DIAGNOSTIC MICROBIOLOGY 2018. [PMCID: PMC7120174 DOI: 10.1007/978-3-319-95111-9_12] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The human bocavirus is one of the most common respiratory viruses and occurs in all age groups. Because Koch’s postulates have been fulfilled unintendedly, it is currently accepted that the virus is a real pathogen associated with upper and lower respiratory tract infections causing clinical symptoms ranging from a mild common cold to life-threatening respiratory diseases. In order to exclude a viremia, serological analysis should be included during laboratory diagnostics, as acute and chronic infections cannot be differentiated by detection of viral nucleic acids in respiratory specimen alone due to prolonged viral shedding. Besides its ability to persist, the virus appears to trigger chronic lung disease and increases clinical symptoms by causing fibrotic lung diseases. Due to the lack of an animal model, clinical trials remain the major method for studying the long-term effects of HBoV infections.
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Affiliation(s)
- Yi-Wei Tang
- Departments of Laboratory Medicine and Internal Medicine, Memorial Sloan Kettering Cancer Center, New York, NY USA
| | - Charles W. Stratton
- Department of Pathology, Microbiology and Immunology and Medicine, Vanderbilt University Medical Center, Nashville, TN USA
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Schildgen O, Schildgen V. Respiratory infections of the human bocavirus. THE MICROBIOLOGY OF RESPIRATORY SYSTEM INFECTIONS 2016. [PMCID: PMC7149820 DOI: 10.1016/b978-0-12-804543-5.00005-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The human bocavirus is one of the most common respiratory viruses and occurs in all age groups. It is associated with upper and lower respiratory tract infections, and causes clinical symptoms from the mild common cold to life threatening respiratory diseases. Besides its ability to persist the virus appears to trigger chronic lung disease and increase the clinical symptoms, while being a putative trigger for fibrotic lung diseases. Laboratory diagnostics should include serological diagnostics in order to rule out a viremia because due to prolonged viral shedding acute and chronic infections cannot be differentiated on the detection of viral nucleic acids in respiratory specimen alone. Although Koch’s postulates cannot be formally fulfilled due to the lack of an animal model and the chance for clinical trials with volunteers are limited due to the long term effects of HBoV infections, there is no doubt that the virus is a serious pathogen and requires attention. The aim of the chapter is to present an overview of our current knowledge on respiratory infections with the human bocavirus, and to provide basic and essential information on clinical features, molecular diagnostics, and epidemiologic challenges arising with this pathogen.
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Shevchenko EK, Makarevich PI, Tsokolaeva ZI, Boldyreva MA, Sysoeva VY, Tkachuk VA, Parfyonova YV. Transplantation of modified human adipose derived stromal cells expressing VEGF165 results in more efficient angiogenic response in ischemic skeletal muscle. J Transl Med 2013; 11:138. [PMID: 23742074 PMCID: PMC3680170 DOI: 10.1186/1479-5876-11-138] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 05/29/2013] [Indexed: 01/21/2023] Open
Abstract
Background Modified cell-based angiogenic therapy has become a promising novel strategy for ischemic heart and limb diseases. Most studies focused on myoblast, endothelial cell progenitors or bone marrow mesenchymal stromal cells transplantation. Yet adipose-derived stromal cells (in contrast to bone marrow) are abundantly available and can be easily harvested during surgery or liposuction. Due to high paracrine activity and availability ADSCs appear to be a preferable cell type for cardiovascular therapy. Still neither genetic modification of human ADSC nor in vivo therapeutic potential of modified ADSC have been thoroughly studied. Presented work is sought to evaluate angiogenic efficacy of modified ADSCs transplantation to ischemic tissue. Materials and methods Human ADSCs were transduced using recombinant adeno-associated virus (rAAV) serotype 2 encoding human VEGF165. The influence of genetic modification on functional properties of ADSCs and their angiogenic potential in animal models were studied. Results We obtained AAV-modified ADSC with substantially increased secretion of VEGF (VEGF-ADSCs). Transduced ADSCs retained their adipogenic and osteogenic differentiation capacities and adhesion properties. The level of angiopoetin-1 mRNA was significantly increased in VEGF-ADSC compared to unmodified cells yet expression of FGF-2, HGF and urokinase did not change. Using matrigel implant model in mice it was shown that VEGF-ADSC substantially stimulated implant vascularization with paralleling increase of capillaries and arterioles. In murine hind limb ischemia test we found significant reperfusion and revascularization after intramuscular transplantation of VEGF-ADSC compared to controls with no evidence of angioma formation. Conclusions Transplantation of AAV-VEGF- gene modified hADSC resulted in stronger therapeutic effects in the ischemic skeletal muscle and may be a promising clinical treatment for therapeutic angiogenesis.
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Affiliation(s)
- Evgeny K Shevchenko
- Laboratory of angiogenesis, Russian Cardiology Research and Production Complex, 3rd Cherepkovskaya 15A, Moscow, 121552, Russia.
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Bockstael O, Melas C, Pythoud C, Levivier M, McCarty D, Samulski RJ, De Witte O, Tenenbaum L. Rapid transgene expression in multiple precursor cell types of adult rat subventricular zone mediated by adeno-associated type 1 vectors. Hum Gene Ther 2012; 23:742-53. [PMID: 22471423 DOI: 10.1089/hum.2011.216] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The adult rat brain subventricular zone (SVZ) contains proliferative precursors that migrate to the olfactory bulb (OB) and differentiate into mature neurons. Recruitment of precursors constitutes a potential avenue for brain repair. We have investigated the kinetics and cellular specificity of transgene expression mediated by AAV2/1 vectors (i.e., adeno-associated virus type 2 pseudotyped with AAV1 capsid) in the SVZ. Self-complementary (sc) and single-stranded (ss) AAV2/1 vectors mediated efficient GFP expression, respectively, at 17 and 24 hr postinjection. Transgene expression was efficient in all the rapidly proliferating cells types, that is, Mash1(+) precursors (30% of the GFP(+) cells), Dlx2(+) neuronal progenitors (55%), Olig2(+) oligodendrocyte progenitors (35%), and doublecortin-positive (Dcx(+)) migrating cells (40%), but not in the slowly proliferating glial fibrillary acidic protein-positive (GFAP(+)) neural stem cell pool (5%). Because cell cycle arrest by wild-type and recombinant AAV has been described in primary cultures, we examined SVZ proliferative activity after vector injection. Indeed, cell proliferation was reduced immediately after vector injection but was normal after 1 month. In contrast, migration and differentiation of GFP(+) precursors were unaltered. Indeed, the proportion of Dcx(+) cells was similar in the injected and contralateral hemispheres. Furthermore, 1 month after vector injection into the SVZ, GFP(+) cells, found, as expected, in the OB granular cell layer, were mature GABAergic neurons. In conclusion, the rapid and efficient transgene expression in SVZ neural precursors mediated by scAAV2/1 vectors underlines their potential usefulness for brain repair via recruitment of immature cells. The observed transient precursor proliferation inhibition, not affecting their migration and differentiation, will likely not compromise this strategy.
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Affiliation(s)
- Olivier Bockstael
- Laboratory of Experimental Neurosurgery, Université Libre de Bruxelles, BE-1070 Brussels, Belgium.
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Alam S, Bowser BS, Conway MJ, Israr M, Tandon A, Meyers C. Adeno-associated virus type 2 infection activates caspase dependent and independent apoptosis in multiple breast cancer lines but not in normal mammary epithelial cells. Mol Cancer 2011; 10:97. [PMID: 21827643 PMCID: PMC3199901 DOI: 10.1186/1476-4598-10-97] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 08/09/2011] [Indexed: 01/28/2023] Open
Abstract
Background In normal cells proliferation and apoptosis are tightly regulated, whereas in tumor cells the balance is shifted in favor of increased proliferation and reduced apoptosis. Anticancer agents mediate tumor cell death via targeting multiple pathways of programmed cell death. We have reported that the non-pathogenic, tumor suppressive Adeno-Associated Virus Type 2 (AAV2) induces apoptosis in Human Papillomavirus (HPV) positive cervical cancer cells, but not in normal keratinocytes. In the current study, we examined the potential of AAV2 to inhibit proliferation of MCF-7 and MDA-MB-468 (both weakly invasive), as well as MDA-MB-231 (highly invasive) human breast cancer derived cell lines. As controls, we used normal human mammary epithelial cells (nHMECs) isolated from tissue biopsies of patients undergoing breast reduction surgery. Results AAV2 infected MCF-7 line underwent caspase-independent, and MDA-MB-468 and MDA-MB-231 cell lines underwent caspase-dependent apoptosis. Death of MDA-MB-468 cells was marked by caspase-9 activation, whereas death of MDA-MB-231 cells was marked by activation of both caspase-8 and caspase-9, and resembled a mixture of apoptotic and necrotic cell death. Cellular demise was correlated with the ability of AAV2 to productively infect and differentially express AAV2 non-structural proteins: Rep78, Rep68 and Rep40, dependent on the cell line. Cell death in the MCF-7 and MDA-MB-231 lines coincided with increased S phase entry, whereas the MDA-MB-468 cells increasingly entered into G2. AAV2 infection led to decreased cell viability which correlated with increased expression of proliferation markers c-Myc and Ki-67. In contrast, nHMECs that were infected with AAV2 failed to establish productive infection or undergo apoptosis. Conclusion AAV2 regulated enrichment of cell cycle check-point functions in G1/S, S and G2 phases could create a favorable environment for Rep protein expression. Inherent Rep associated endonuclease activity and AAV2 genomic hair-pin ends have the potential to induce a cellular DNA damage response, which could act in tandem with c-Myc regulated/sensitized apoptosis induction. In contrast, failure of AAV2 to productively infect nHMECs could be clinically advantageous. Identifying the molecular mechanisms of AAV2 targeted cell cycle regulation of death inducing signals could be harnessed for developing novel therapeutics for weakly invasive as well as aggressive breast cancer types.
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Affiliation(s)
- Samina Alam
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA 17033, USA
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Adeno-associated virus type 2 induces apoptosis in human papillomavirus-infected cell lines but not in normal keratinocytes. J Virol 2009; 83:10286-92. [PMID: 19625406 DOI: 10.1128/jvi.00343-09] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The results of seroepidemiological studies suggest that infection with adeno-associated virus type 2 (AAV2) is negatively correlated with the incidence of human papillomavirus (HPV)-associated cervical cancer. We studied the potential of AAV2 oncosuppression of HPV and showed that HPV/AAV2 coinfection of cells culminated in apoptotic death, as determined by DNA laddering and caspase-3 cleavage. The induction of apoptosis coincided with AAV2 Rep protein expression; increased S-phase progression; upregulated pRb displaying both hyper- and hypophosphorylated forms; increased levels of p21(WAF1), p16(INK4), and p27(KIP1) proteins; and diminished levels of E7 oncoprotein. In contrast, normal keratinocytes that were infected with AAV2 or transfected with the cloned full-length AAV2 genome failed to express Rep proteins or undergo apoptosis. The failure of AAV2 to productively infect normal keratinocytes could be clinically advantageous. The delineation of the molecular mechanisms underlying the HPV/AAV2 interaction could be harnessed for developing novel AAV2-derived therapeutics for cervical cancer.
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Bantel-Schaal U, Braspenning-Wesch I, Kartenbeck J. Adeno-associated virus type 5 exploits two different entry pathways in human embryo fibroblasts. J Gen Virol 2009; 90:317-322. [PMID: 19141440 DOI: 10.1099/vir.0.005595-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
The helper-dependent adeno-associated viruses (AAVs) have attracted great interest as vectors for gene therapy. Uptake and intracellular trafficking pathways of AAV are of importance, since they are often rate-limiting steps in infection. Here, we have investigated the entry of AAV type 5 (AAV5) in primary human embryo fibroblasts. At low binding temperatures, numerous virions are concentrated between cells, at contact points between cells and cellular protrusions, and at filopodia. When the temperature is raised to 37 degrees C, uptake of AAV5 takes place but up to 80 % of the bound virions dissociate from the cells. Uptake is achieved by cellular structures that are part of at least two different entry pathways. In addition to the common clathrin-dependent route, caveolar endocytosis and caveosome-like organelles are involved in a second pathway not yet described for parvoviruses. Both pathways can be used in parallel to enter an individual cell.
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Affiliation(s)
- Ursula Bantel-Schaal
- German Cancer Research Center, Infection and Cancer Research Program, Im Neuenheimer Feld 242, 69120 Heidelberg, Germany
| | - Ilona Braspenning-Wesch
- German Cancer Research Center, Infection and Cancer Research Program, Im Neuenheimer Feld 242, 69120 Heidelberg, Germany
| | - Juergen Kartenbeck
- Cell Biology and Tumor Biology Research Program, Im Neuenheimer Feld 242, 69120 Heidelberg, Germany
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Ho KJ, Bass CE, Kroemer AHK, Ma C, Terwilliger E, Karp SJ. Optimized adeno-associated virus 8 produces hepatocyte-specific Cre-mediated recombination without toxicity or affecting liver regeneration. Am J Physiol Gastrointest Liver Physiol 2008; 295:G412-9. [PMID: 18535290 PMCID: PMC2519860 DOI: 10.1152/ajpgi.00590.2007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
UNLABELLED Engineering viral vectors to produce liver-specific protein expression may help advance understanding of hepatic regeneration and disease states. In addition to introducing genes of interest to the liver, these vectors can be adapted for gene deletion when designed to express Cre recombinase. The ability to use this system requires high, liver-restricted expression, low toxicity, and no effect on the process of interest. We developed an adeno-associated virus 8 (AAV8) with a codon-optimized Cre recombinase under a hepatocyte-specific major urinary protein (MUP) promoter (MUP-iCre-AAV8) that fulfills these requirements. A single intravenous injection of ROSA26R reporter mice, which express lacZ after Cre-mediated recombination, demonstrated homogeneous beta-galactosidase expression limited to hepatocytes after only 7 days. Cre protein expression remained strong for at least 31 days. Serum liver function tests and histology demonstrated minimal liver toxicity. The presence of MUP-iCre-AAV8 did not affect hepatocyte proliferation after partial hepatectomy as measured by Ki67 staining. CONCLUSION AAV8 with the MUP promoter, by virtue of its lack of hepatic toxicity or effect on liver regeneration, may be an efficient alternative to complex transgenic methodologies for studies of the mouse liver.
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Affiliation(s)
- Karen J. Ho
- Departments of Surgery and Medicine, Beth Israel Deaconess Medical Center, Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Caroline E. Bass
- Departments of Surgery and Medicine, Beth Israel Deaconess Medical Center, Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Alexander H. K. Kroemer
- Departments of Surgery and Medicine, Beth Israel Deaconess Medical Center, Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Chunyan Ma
- Departments of Surgery and Medicine, Beth Israel Deaconess Medical Center, Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Ernest Terwilliger
- Departments of Surgery and Medicine, Beth Israel Deaconess Medical Center, Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts
| | - Seth J. Karp
- Departments of Surgery and Medicine, Beth Israel Deaconess Medical Center, Department of Surgery, Brigham and Women's Hospital, Boston, Massachusetts
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Kerr JR, Boschetti N. Short regions of sequence identity between the genomes of human and rodent parvoviruses and their respective hosts occur within host genes for the cytoskeleton, cell adhesion and Wnt signalling. J Gen Virol 2006; 87:3567-3575. [PMID: 17098972 DOI: 10.1099/vir.0.82259-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Our understanding of the mechanism(s) of pathogenesis and persistence of vertebrate parvoviruses remains incomplete. With the recent availability of the complete genome sequences of human, rat and mouse, and the ability to search these sequences and to locate matches to exact genomic regions, further insight into the interaction of parvoviruses with their human and rodent hosts is possible. To determine the extent and nature of sequence identity between candidate parvoviruses and their respective hosts, blast searches of the genome sequences of adeno-associated virus, parvovirus B19, mouse parvovirus, the prototype strain and immunosuppressant variant of minute virus of mouse, Kilham rat virus and rat parvovirus were performed against the genome(s) of their respective hosts (human, rat and mouse) using the resources of the NCBI and the Celera Discovery System. Regions of identity and similarity were mapped to their precise location in their particular host genome. For each virus, between one and 12 identical regions were found. Each identical region was 17-26 nt and was generally found at multiple sites within the particular host genome. These identical regions were predominantly located in non-coding regions of particular host genes and in intergenic regions. The ontology of host genes in which identical regions were found for each of the nine virus-host interactions highlighted several pathways/processes, including the cytoskeleton, cell adhesion and Wnt signalling. Within each virus species, these homologous regions were highly conserved (100 % identity in 16 out of 23 alignments where more than one sequence was available). All of these aspects suggest a particular advantage to the viruses of the presence of these sequences.
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Affiliation(s)
- Jonathan R Kerr
- Department of Cellular and Molecular Medicine, St George's University of London, Cranmer Terrace, London SW17 0RE, UK
| | - Nicola Boschetti
- ZLB Behring AG, Wankdorfstrasse 10, CH-3000 Bern 22, Switzerland
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Borrás T, Xue W, Choi VW, Bartlett JS, Li G, Samulski RJ, Chisolm SS. Mechanisms of AAV transduction in glaucoma-associated human trabecular meshwork cells. J Gene Med 2006; 8:589-602. [PMID: 16506246 DOI: 10.1002/jgm.886] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND Glaucoma is a chronic eye disease which leads to irreversible blindness. The trabecular meshwork tissue controls intraocular pressure (IOP), which is the major risk factor for glaucoma. Gene therapy treatment of chronic diseases requires the use of long-term expression, low toxicity and lack of immune response vectors. Adeno-associated viruses (AAV) possess these characteristics but have been unable to transduce the trabecular meshwork. Because of the importance of regulating elevated IOP by long-term gene therapy, we investigated mechanisms of AAV transduction to the human trabecular meshwork (TM). METHODS Primary human trabecular meshwork cells (HTM) and perfused organ cultures were infected with rAAV2-GFP, RGD-pseudotyped rAAV2-GFP alone, or combined with recombinant DeltaE1/E3 adenoviruses. Intracellular rAAV2 DNA and RNA were measured by relative quantitative and real-time TaqMan polymerase chain reaction (PCR). Host transcriptome was analyzed using high-density oligonucleotide microarrays. One transduction mechanism was tested using self-complementary AAV (scAAV). RESULTS The dramatic transduction enhancement obtained upon co-infection of rAAV2 with DeltaE1/E3 adenoviruses provides insights into transduction mechanisms in the HTM. Even if not transduced, rAAV2 enters TM cells. GeneChip analysis showed significant changes in host genes involved in cell cycle and DNA replication. Consequently, scAAV-GFP transduction was highly efficient. Other transduction-enhancement genes included coxsackie adenovirus receptor (CAR) and genes relevant to trabecular meshwork function. CONCLUSIONS The rate-limiting step of AAV transduction was not viral entry failure but, at least in part, host downregulation of DNA replication. Additional specific host genes might be involved. Our study revealed genes and mechanisms which led for the first time to efficient AAV transduction of the HTM.
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Affiliation(s)
- Teresa Borrás
- Department of Ophthalmology, University of North Carolina School of Medicine, 103 Mason Farm Road, Chapel Hill, NC 27599, USA.
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Stilwell JL, Samulski RJ. Role of viral vectors and virion shells in cellular gene expression. Mol Ther 2004; 9:337-46. [PMID: 15006600 DOI: 10.1016/j.ymthe.2003.11.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2003] [Accepted: 11/14/2003] [Indexed: 11/24/2022] Open
Abstract
The role of the virion shell in viral pathogenesis is relatively unknown yet the use of viral vectors in human gene transfer experiments requires an understanding of these interactions. In this study, we used DNA microarrays to identify genes modulated during pathogenic adenovirus or nonpathogenic adeno-associated virus infections. Responses to wt viruses, recombinant vectors, or empty virion particles were compared. Adeno-associated virus shells induced nearly the full complement of changes elicited by the intact virus. The cellular genes elicited a nonpathogenic response, with antiproliferative genes being induced as a cluster. In contrast, adenovirus and adenovirus empty capsid infection yielded a broader response and subset, respectively, including induction of immune and stress-response genes associated with pathogenic effects. Our studies show that the impact of the viral capsid on cellular gene expression, and potential host toxicity, must be considered independent of the vector genome for safe gene transfer in the clinic.
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Affiliation(s)
- Jackie L Stilwell
- Curriculum in Genetics and Molecular Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7352, USA
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Duverger V, Sartorius U, Klein-Bauernschmitt P, Krammer PH, Schlehofer JR. Enhancement of cisplatin-induced apoptosis by infection with adeno-associated virus type 2. Int J Cancer 2002; 97:706-12. [PMID: 11807802 DOI: 10.1002/ijc.10077] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The non-pathogenic human adeno-associated virus, AAV, has been shown to sensitize human cancer cells and experimental tumors towards the action of chemotherapeutic agents such as cisplatin. Since chemotherapeutic drugs mainly involve the induction of apoptosis, we investigated whether 1 possible mechanism of AAV-mediated sensitization of human tumor cells may result from an enhancement of cisplatin-induced apoptosis. In HeLa and A549 cells, infection with AAV type 2 (AAV-2) increased cisplatin-induced DNA fragmentation but had no cytotoxic effect by itself. This enhanced apoptosis appeared to be mediated at least in part by a component of the viral capsid since empty or UV-inactivated AAV-2 particles were also able to boost cisplatin-induced DNA fragmentation. Interestingly, these effects were not observed after infection with AAV type 5 (AAV-5) or the autonomous parvovirus, H-1. AAV-2-mediated enhancement of apoptosis was not associated with a modification of the expression of CD95 ligand, CD95 receptor or other death receptors, as shown by RT-PCR and RNase protection assay. In contrast, using the mitochondrial fluorescent dye, JC-1 in flow cytometry, AAV-2 infection was found to further reduce the mitochondrial transmembrane potential after treatment with cisplatin in a caspase-independent manner, suggesting that increase of apoptosis by AAV-2 occurred at the mitochondrial level. In contrast, in cells of the small cell lung cancer line, P693, an enhancement of cisplatin-induced DNA fragmentation was not observed after infection with AAV-2. In these cells, sensitization to cisplatin-toxicity was associated with cell cycle arrest in G2/M. The data indicate that in the absence of viral gene expression, AAV-2-mediated sensitization to cisplatin involves multiple cellular pathways promoting cell death signals in a cell type-dependent manner. The results further support that AAV-2 particles may be appropriate adjuvants for improving cancer chemotherapy and may also have consequences regarding AAV-2-based vectors for gene therapy.
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Affiliation(s)
- Valerie Duverger
- Applied Tumor Virology, German Cancer Research Center, Heidelberg, Germany
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Bantel-Schaal U. Integration of adeno-associated virus 2 DNA in human MKR melanoma cells induces a peptide with oncosuppressive properties. Int J Cancer 2001; 92:537-44. [PMID: 11304688 DOI: 10.1002/ijc.1230] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Integration of adeno-associated virus type 2 (AAV2) DNA into the genome of the human MKr melanoma cell line grossly alters the cellular phenotype of these cells. Cultures derived from AAV DNA-harboring single cells share various similarities with normal cells in culture, and a considerable number of clones show signs of cellular senescence and terminal differentiation. Medium conditioned by such terminally differentiating cells contains a small cytokine-like factor (AAV-induced factor [AIF]). The factor was characterized as peptide, which influences cell adhesion and appears to exist in forms of different activity connected by a trypsin-like cleavage site. It modulates cell growth in opposite ways: proliferation of tumor-derived cells is inhibited and fibroblasts are stimulated. The observations suggest that integration of AAV may result in cytokine induction and thus can indirectly affect growth of distant AAV-free target cells in a paracrine or endocrine manner. This is of interest with regard to anti-oncogenic properties of AAV and may also imply the possibility of AAV pathogenicity.
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Affiliation(s)
- U Bantel-Schaal
- Deutsches Krebsforschungszentrum Heidelberg, Angewandte Tumorvirologie F0400, Heidelberg, Germany.
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Ogston P, Raj K, Beard P. Productive replication of adeno-associated virus can occur in human papillomavirus type 16 (HPV-16) episome-containing keratinocytes and is augmented by the HPV-16 E2 protein. J Virol 2000; 74:3494-504. [PMID: 10729123 PMCID: PMC111857 DOI: 10.1128/jvi.74.8.3494-3504.2000] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We used a sensitive assay to test whether an adeno-associated virus (AAV) productive replication cycle can occur in immortalized human keratinocytes carrying episomal human papillomavirus type 16 (HPV-16) DNA. Following transfection with cloned AAV DNA, infectious AAV was produced, and the infectivity was blocked by anti-AAV antiserum. The HPV-16 E2 protein substantially increased the yield of AAV. Other HPV early proteins did not, in our experiments, show this ability. E2 has been shown to be able to affect p53 levels and to block cell cycle progression at mitosis. We tested the effect of changes in p53 expression on AAV replication and found that large differences in the level of p53 did not alter AAV DNA replication. In extension of this, we found that cellular help for AAV in response to stress was also independent of p53. To test if a mitotic block could trigger AAV DNA replication, we treated the cells with the mitotic inhibitor nocodazole. AAV DNA replication was stimulated by the presence of nocodazole in these and a number of other cell types tested. Yields of infectious virus, however, were not increased by this treatment. We conclude that the HPV-16 E2 protein stimulates AAV multiplication in these cells and propose that this occurs independently of the effects of E2 on p53 and cell cycle progression. Since the effect of E2 was not seen in keratinocytes lacking the HPV-16 episome, we suggest that E2 can help AAV by working in concert with other HPV-16 proteins.
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Affiliation(s)
- P Ogston
- Swiss Institute for Experimental Cancer Research (ISREC), 1066-Epalinges, Switzerland
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Tsunoda H, Hayakawa T, Sakuragawa N, Koyama H. Site-specific integration of adeno-associated virus-based plasmid vectors in lipofected HeLa cells. Virology 2000; 268:391-401. [PMID: 10704347 DOI: 10.1006/viro.1999.0122] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Adeno-associated virus (AAV) integrates specifically into a site (AAVS1) on human chromosome 19q13.3-qter. Similarly, there is accumulating evidence that this site-specific integration occurs by transfection of AAV-based plasmid vectors. In order to further define the process of plasmid integration events, we constructed some AAV plasmids, introduced them into HeLa cells by lipofection, and isolated chromosomal integrants. One of such plasmids, pTH-5, contained the rep and neomycin-resistant (neo(r)) genes flanked by the 5'- and 3'-inverted terminal repeats of AAV and the hygromycin-resistant (hyg(r)) gene located in the plasmid backbone. Southern blot analysis revealed that among 36 G418-resistant (G418(r)) clones isolated, 22 (61%) showed site-specific integration into AAVS1. Further structural and functional analyses on the expression of the hyg(r) gene in the site-specific clones and the LacZ gene in clones generated with plasmid pTH-2 indicated that, together with the AAV sequence, the plasmid backbone was integrated into the AAVS1 site and thus the neo(r) and hyg(r) genes remained linked at high frequencies in the targeted integrants compared with random integrants. Sequence analysis of integration junctions between pTH-5 and AAVS1 revealed that the junctions occurred in the p5 promoter region of the plasmid while mainly in the partial cDNA coding region of the AAVS1 site. We also found that plasmid pTH-1 linearized in the backbone before lipofection gave a significantly lower frequency of site-specific integration (26%) than the circular form (60%). This finding may support the involvement of the double-stranded, circular form of infected AAV in the integration process. Our results may help to understand the process and mechanism of site-specific integration of lipofected AAV plasmid vectors.
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Affiliation(s)
- H Tsunoda
- Kihara Institute for Biological Research, Graduate School of Integrated Science, Yokohama City University, Maioka-cho 641-12, Totsuka-ku, Yokohama, 244-0813, Japan
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17
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Bantel-Schaal U. Chromosomal integration of adeno-associated parvovirus DNA limits proliferation and dispersal of human MKr melanoma cells in co-cultures with human fibroblasts. Cancer Lett 1999; 147:45-53. [PMID: 10660088 DOI: 10.1016/s0304-3835(99)00270-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Adeno-associated parvoviruses (AAVs) possess onco-suppressive potential and inhibit proliferation of cells derived from malignant human tumors in culture. Growth inhibition of human melanoma cells can be achieved when the cells are infected with these viruses but continues subsequent to infection when viral DNA is chromosomally integrated. Integration of AAV2 DNA into the genome of the human melanoma cell line MKr alters the cellular phenotype towards that of diploid cells in culture, and leads to density-arrested growth, strong reduction of the ability to form colonies from single cells and to an increased number of terminally differentiating cultures. The present study aimed at the question whether the altered growth properties were retained upon prolonged co-cultivation with fibroblasts, i.e. under conditions that occur in invasive growth and colonization of distant tissues. The results show that despite the known possibility of growth stimulation by fibroblasts the potential of melanoma cells to proliferate and the potential to further scatter in the fibroblast cultures remain limited when AAV DNA is integrated.
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Affiliation(s)
- U Bantel-Schaal
- Deutsches Krebsforschungszentrum Heidelberg, Forschungsschwerpunkt Angewandte Tumorvirologie F0400, Germany.
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18
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Abstract
The cell cycle is a complex process that involves numerous regulatory proteins that direct the cell through a specific sequence of events culminating in mitosis and the production of two daughter cells. Central to this process are the cyclin-dependent kinases (cdks), which complex with the cyclin proteins. These proteins regulate the cell's progression through the stages of the cell cycle and are in turn regulated by numerous proteins, including p53, p21, p16, and cdc25. Downstream targets of cyclin-cdk complexes include pRb and E2F. The cell cycle can be altered to the advantage of many viral agents, most notably polyomaviruses, papillomaviruses, and adenoviruses. The cell cycle often is dysregulated in neoplasia due to alterations either in oncogenes that indirectly affect the cell cycle or in tumor suppressor genes or oncogenes that directly impact cell cycle regulation, such as pRb, p53, p16, cyclin D1, or mdm-2. The cell cycle has become an intense subject of research in recent years. This research has led to the development of techniques useful for the determination of the effects of drugs and toxins on the cell cycle. Any drug or toxin with DNA damaging ability would be expected to alter cell cycle progression, and therefore, the cell cycle should be considered in the design of studies using such chemicals. With the appropriate techniques, cell cycle alterations may also be detected in tissue sections. Because of the ubiquitous nature of the cell cycle, it deserves consideration in the design and interpretation of studies in a wide variety of disciplines.
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Di Pasquale G, Stacey SN. Adeno-associated virus Rep78 protein interacts with protein kinase A and its homolog PRKX and inhibits CREB-dependent transcriptional activation. J Virol 1998; 72:7916-25. [PMID: 9733829 PMCID: PMC110121 DOI: 10.1128/jvi.72.10.7916-7925.1998] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Adeno-associated virus (AAV) is a human parvovirus of the genus Dependovirus. AAV replication is largely restricted to cells which are coinfected with a helper virus. In the absence of a helper virus, the AAV genome can integrate into a specific chromosomal site where it remains latent until reactivated by superinfection of the host cell with an appropriate helper virus. Replication functions of AAV have been mapped to the Rep68 and Rep78 gene products. Rep proteins demonstrate DNA binding, endonuclease, and helicase activities and are involved in regulation of transcription from both AAV and heterologous promoters. AAV has been associated with suppression of oncogenicity in a range of viral and nonviral tumors. In this study we sought to identify and study cellular protein targets of AAV Rep, in order to develop a better understanding of the various activities of Rep. We used the yeast two-hybrid system to identify HeLa cell proteins that interact with AAV type 2 Rep78. We isolated several strongly interacting clones which were subsequently identified as PRKX (previously named PKX1), a recently described homolog of the protein kinase A (PKA) catalytic subunit (PKAc). The interaction was confirmed in vitro by using pMal-Rep pull-down assays. The region of Rep78 which interacts was mapped to a C-terminal zinc finger-like domain; Rep68, which lacks this domain, did not interact with PRKX. PRKX demonstrated autophosphorylation and kinase activity towards histone H1 and a PKA oligopeptide target. Autophosphorylation was inhibited by interaction with Rep78. In transfection assays, a PRKX expression vector was shown to be capable of activating CREB-dependent transcription. This activation was suppressed by Rep78 but not by Rep68. Since PRKX is a close homolog of PKAc, we investigated whether Rep78 could interact directly with PKAc. pMal-Rep78 was found to associate with purified PKAc and inhibited its kinase activity. Cotransfection experiments demonstrated that Rep78 could block the activation of CREB by a PKAc expression vector. These experiments suggest that AAV may perturb normal cyclic AMP response pathways in infected cells.
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Affiliation(s)
- G Di Pasquale
- Cancer Research Campaign, Section of Molecular Genetics, Paterson Institute for Cancer Research, Christie Hospital, Manchester M20 4BX, United Kingdom
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20
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Kube DM, Ponnazhagan S, Srivastava A. Encapsidation of adeno-associated virus type 2 Rep proteins in wild-type and recombinant progeny virions: Rep-mediated growth inhibition of primary human cells. J Virol 1997; 71:7361-71. [PMID: 9311814 PMCID: PMC192081 DOI: 10.1128/jvi.71.10.7361-7371.1997] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The adeno-associated virus type 2 (AAV) arrests the growth of primary human fibroblasts in vitro at high particle-to-cell ratios. To test the role of AAV gene expression in the observed growth inhibition, primary human cells were infected, under identical conditions, with wild-type (wt) AAV or with recombinant AAV that lacked all viral promoters and coding sequences. Significant, dose-dependent growth inhibition of primary human cells was observed with both wt and recombinant AAV at particle-to-cell ratios equal to or exceeding 10(4). In contrast, neither virus affected the growth of immortalized human cells even at a 10-fold-higher particle-to-cell ratio. AAV-induced growth arrest could be overcome by reculturing cells after treatment with trypsin. Even after reculturing, cells still harbored the proviral AAV genome. Thus, neither integration nor expression of the AAV genome appears to be required for the virus-induced growth-inhibitory effect on primary human cells. The growth-inhibitory effect of AAV was hypothesized to be mediated by virion-associated AAV Rep proteins, since these proteins have been reported to inhibit cellular DNA synthesis. Rep proteins tightly associated with wt as well as recombinant AAV could be detected on Western blots. Coinfection by adenovirus was necessary and sufficient for ample replication of recombinant AAV genomes lacking the rep gene. Although wt AAV-like particles arose during production of the recombinant AAV stocks, their low-titer levels were insufficient to cause the observed growth inhibition. AAV rep gene expression from these contaminating particles was not required for replication of the recombinant AAV genomes, which could be detected even in the absence of de novo Rep protein synthesis. Exposure of recombinant AAV to anti-AAV Rep protein antibodies did not abrogate viral infectivity. These results suggest that biologically active Rep proteins are encapsidated in mature progeny AAV particles. AAV Rep protein-mediated growth inhibition of primary human cells has implications in the use of AAV-based vectors in human gene therapy.
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Affiliation(s)
- D M Kube
- Department of Microbiology and Immunology, Walther Oncology Center, Indiana University School of Medicine, and Walther Cancer Institute, Indianapolis 46202, USA
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21
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Chiorini JA, Yang L, Liu Y, Safer B, Kotin RM. Cloning of adeno-associated virus type 4 (AAV4) and generation of recombinant AAV4 particles. J Virol 1997; 71:6823-33. [PMID: 9261407 PMCID: PMC191963 DOI: 10.1128/jvi.71.9.6823-6833.1997] [Citation(s) in RCA: 182] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
We have cloned and characterized the full-length genome of adeno-associated virus type 4 (AAV4). The genome of AAV4 is 4,767 nucleotides in length and contains an expanded p5 promoter region compared to AAV2 and AAV3. Within the inverted terminal repeat (ITR), several base changes were identified with respect to AAV2. However, these changes did not affect the ability of this region to fold into a hairpin structure. Within the ITR, the terminal resolution site and Rep binding sites were conserved; however, the Rep binding site was expanded from three GAGC repeats to four. The Rep gene product of AAV4 shows greater than 90% homology to the Rep products of serotypes 2 and 3, with none of the changes occurring in regions which had previously been shown to affect the known functions of Rep68 or Rep78. Most of the differences in the capsid proteins lie in regions which are thought to be on the exterior surface of the viral capsid. It is these unique regions which are most likely to be responsible for the lack of cross-reacting antibodies and the altered tissue tropism compared to AAV2. The results of our studies, performed with a recombinant version of AAV4 carrying a lacZ reporter gene, suggest that AAV4 can transduce human, monkey, and rat cells. Furthermore, comparison of transduction efficiencies in a number of cell lines, competition cotransduction experiments, and the effect of trypsin on transduction efficiency all suggest that the cellular receptor for AAV4 is distinct from that of AAV2.
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Affiliation(s)
- J A Chiorini
- Molecular Hematology Branch, National Heart Lung and Blood Institute, Bethesda, Maryland 20892, USA
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22
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Hermanns J, Schulze A, Jansen-Db1urr P, Kleinschmidt JA, Schmidt R, zur Hausen H. Infection of primary cells by adeno-associated virus type 2 results in a modulation of cell cycle-regulating proteins. J Virol 1997; 71:6020-7. [PMID: 9223493 PMCID: PMC191859 DOI: 10.1128/jvi.71.8.6020-6027.1997] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
It has been demonstrated that infection of primary human cells with adeno-associated viruses (AAV) leads to a decrease in cellular proliferation and to growth arrest. We analyzed the molecular basis of this phenomenon and observed that infection with AAV type 2 (AAV2) had an effect on several factors engaged in the control of the mammalian cell cycle. In particular, all of the pRB family members, pRB, p107, and p130, which are involved in G1 cell cycle checkpoint control, were affected. After infection, a shift from hyper- to hypophosphorylated forms was observed. Cyclins A and B1, which are required for G1/S transition and progression into mitosis, respectively, were downregulated at the transcriptional level as well as at the protein level, whereas the G1 cyclins D1 and E remained unaffected. In addition, the steady-state levels of cyclin-dependent kinases CDK1 and CDK2 and of transcription factor E2F-1 were diminished. Of all the factors known to be involved in phosphorylation of pRB family proteins, only the CDK inhibitor p21WAF1 exhibited a response to AAV2 infection. p21WAF1 mRNA was quickly and progressively upregulated in a p53-independent manner over at least 72 h. Consistent with the increased p21WAF1 protein levels, cyclin E- and cyclin A-dependent kinase activities declined to low levels and E2F-p130-cyclin-CDK2 complexes were disrupted. From these data, we conclude that the major effect of AAV2 infection on primary human fibroblasts appears to be upregulation of p21WAF1 gene expression and thus cell cycle arrest by the suppression of pRB family protein phosphorylation.
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Affiliation(s)
- J Hermanns
- Deutsches Krebsforschungszentrum, Forschungsschwerpunkt Angewandte Tumorvirologie, Heidelberg, Germany.
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23
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Affiliation(s)
- K I Berns
- Department of Microbiology, Hearst Microbiology Research Center, Cornell University Medical College, New York 10021, USA
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24
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Chiorini JA, Wendtner CM, Urcelay E, Safer B, Hallek M, Kotin RM. High-efficiency transfer of the T cell co-stimulatory molecule B7-2 to lymphoid cells using high-titer recombinant adeno-associated virus vectors. Hum Gene Ther 1995; 6:1531-41. [PMID: 8664378 DOI: 10.1089/hum.1995.6.12-1531] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Adeno-associated virus (AAV) is a single-stranded DNA virus that can either integrate or replicate in host cells. Production of recombinant viral particles (rAAV) requires expression of the viral structural genes and the viral inverted terminal repeats in cis. By using an SV40 replicon to amplify the structural genes, the yield of recombinant viral particles was increased 60-fold over a nonreplicating helper plasmid. The rAAV particles produced by this system have similar physical properties to wild-type particles, including buoyant density, size, and morphology. This novel rAAV packaging system was used to produce rAAV particles that contain the gene for the T cell co-stimulatory protein B7-2. Transduction of the human nonadherent lymphoid cell line LP-1 with these particles significantly increased the percentage of cells expressing B7-2 from 6.8% to 78.0%. Expression of B7-2 in the human lymphoid cell line RPMI-8226 was also substantially increased. Targeting of tumor cells grown in suspension was hampered by low-efficiency transduction using other viral or nonviral vector systems. Our new packaging system for recombinant AAV should allow generation of sufficient quantities of B7-2 containing particles to develop tumor vaccines for non-Hodgkin's lymphoma.
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Affiliation(s)
- J A Chiorini
- Molecular Hematology Branch, National Heart, Lung and Blood Institute, Bethesda, MD 208920
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25
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Affiliation(s)
- K I Berns
- Department of Microbiology, Hearst Microbiology Research Center, Cornell University Medical College, New York, New York 10021, USA
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26
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Bantel-Schaal U. Growth properties of a human melanoma cell line are altered by adeno-associated parvovirus type 2. Int J Cancer 1995; 60:269-74. [PMID: 7829227 DOI: 10.1002/ijc.2910600223] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The adeno-associated parvoviruses (AAV) are known for their oncosuppressive activity. This report shows that infection of the human melanoma cell line MKr with AAV-2 leads to chromosomal integration of the viral DNA. The resulting cultures show decrease of saturation density and reduction in their ability to form colonies from single cells and thus to resemble normal cells. After single-cell cloning they may give rise to growth-arrested, terminally differentiating large, multinucleated cells with dendrite-like extensions, large nucleoli and the ability to synthesize melanin pigment. In cultured melanoma cells, melanin synthesis is correlated with cellular senescence, and since senescent cells cease to proliferate and withdraw from the cell cycle, the apparent induction of growth arrest and terminal differentiation in malignant cells by AAV may provide one explanation for the anti-neoplastic activity of these viruses.
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Affiliation(s)
- U Bantel-Schaal
- Forschungsschwerpunkt Angewandte Tumorvirologie 0625, Deutsches Krebsforschungszentrum Heidelberg, Germany
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27
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Yang Q, Chen F, Trempe JP. Characterization of cell lines that inducibly express the adeno-associated virus Rep proteins. J Virol 1994; 68:4847-56. [PMID: 8035483 PMCID: PMC236424 DOI: 10.1128/jvi.68.8.4847-4856.1994] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The replication (rep) gene of adeno-associated virus (AAV) is involved in AAV DNA replication, gene regulation, and inhibition of cellular transformation induced by various oncogenes. To study the rep gene's antiproliferative effects, we have developed cell lines which express the replication proteins under the control of an inducible mouse metallothionein transcription promoter. The Rep78 protein produced in these cell lines binds to the AAV terminal repeat sequences in vitro and supports AAV DNA replication and trans activation of the AAV p40 transcription promoter in vivo. These cell lines are capable of assembling infectious viruses containing a mutant rep gene or a vector bearing a heterologous gene. Growth rate and colony formation efficiency assays indicated that rep gene expression substantially altered cellular proliferation. Long-term induction of the cell lines followed by removal of the inducing agent suggested that constitutive expression of the Rep proteins does not necessarily result in cell death and that the cells can recover from the cytostatic effects. Flow cytometry analysis indicated that the presence of the Rep proteins increased the population of cells in the S phase of the cell cycle. Thus the rep gene's antiproliferative effects may be realized by interference with cellular DNA replication.
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Affiliation(s)
- Q Yang
- Department of Biochemistry and Molecular Biology, Medical College of Ohio, Toledo 43699-0008
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28
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Hermonat PL. Down-regulation of the human c-fos and c-myc proto-oncogene promoters by adeno-associated virus Rep78. Cancer Lett 1994; 81:129-36. [PMID: 8012930 DOI: 10.1016/0304-3835(94)90193-7] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Adeno-associated virus (AAV) is a non-pathogenic human parvovirus which has anti-tumor and anti-proliferation properties in tissue culture and animal studies. Furthermore, AAV infection is negatively associated with human cervical cancer. C-myc has been implicated in cervical cancer, and c-fos is involved in signal transduction initiation of cell growth. To study the potential regulation of these two prominent human proto-oncogenes by AAV, the expression of three marker coding sequences ligated 3' of the proto-oncogene promoters were observed. Demonstrated here, the AAV Rep78 gene product was able to down-regulate the human c-fos and c-myc proto-oncogene promoters in all three assay systems. These interactions may partially explain AAVs anti-proliferation properties.
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Affiliation(s)
- P L Hermonat
- University of Arkansas for Medical Sciences, Department of Obstetrics and Gynecology, Little Rock 72205
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29
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Affiliation(s)
- J R Schlehofer
- Centre National de la Recherche Scientifique (CNRS), URA 1160, Institut Pasteur de Lille, France
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30
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Leonard CJ, Berns KI. Adeno-associated virus type 2: a latent life cycle. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 1994; 48:29-52. [PMID: 7938552 DOI: 10.1016/s0079-6603(08)60852-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- C J Leonard
- W. R. Hearst Microbiology Research Center, Department of Microbiology, Cornell University Medical College, New York, New York 10021
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31
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32
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Van Pachterbeke C, Tuynder M, Cosyn JP, Lespagnard L, Larsimont D, Rommelaere J. Parvovirus H-1 inhibits growth of short-term tumor-derived but not normal mammary tissue cultures. Int J Cancer 1993; 55:672-7. [PMID: 8406998 DOI: 10.1002/ijc.2910550427] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Infection with parvovirus H-1 strongly interfered with the proliferation of non-established tissue cultures derived from human breast tumors, but had little effect on the growth of corresponding normal human mammary cells. Even though tumor cells were always more sensitive to the virus than normal tissue from the same patient, appreciable quantitative differences were observed among tumor specimens. With time and sub-cultures, the killing effect of the virus on tumor cells became amplified. The impaired growth of infected tumor cells was due both to cytotoxic and to cytostatic action of H-1 virus and was associated with their greater capacity for virus-DNA amplification as compared with normal cells.
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Affiliation(s)
- C Van Pachterbeke
- Laboratory of Biophysics and Radiobiology, Université Libre de Bruxelles, Rhode-St-Genèse, Belgium
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33
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Abstract
Recent characterization of integration of the human parvovirus, adeno-associated virus, has uncovered the exciting occurrence of targeted integration. Thus far, such specific integration has been found to be unique among the eukaryotic viruses. The molecular details of the steps involved in virus integration are actively being pursued and should yield significant information for our understanding of the mechanisms of DNA transposition.
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Affiliation(s)
- R J Samulski
- Department of Biological Sciences, University of Pittsburgh, Pennsylvania 15260
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34
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Bantel-Schaal U. Carcinogen-induced accumulation of adeno-associated parvovirus DNA is transient as a result of two antagonistic activities that both require de novo protein synthesis. Int J Cancer 1993; 53:334-9. [PMID: 8381112 DOI: 10.1002/ijc.2910530227] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Helper-independent synthesis of adeno-associated parvovirus type 5 (AAV-5) DNA in SV40-transformed Syrian hamster cells is induced by chemical carcinogens, UV light and other stress treatments and has previously been shown to be transient. To gain some insight into the underlying mechanism, the influence of inhibitors of protein synthesis on AAV DNA accumulation was investigated. It is shown that transience is the result of 2 antagonistic activities--synthesis and decomposition. Both depend on de novo protein synthesis and are in part overlapping. The 2 activities are influenced by the amount of AAV uptake and/or by cell density. In less dense cultures, calculated initial amount of AAV DNA and relative accumulation per cell are higher. The effect may be due to the activity of transiently synthesized AAV-encoded regulatory proteins that increase replication and have inhibitory effects on DNA decomposition, or to the influence on cellular adhesion.
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Affiliation(s)
- U Bantel-Schaal
- Forschungsschwerpunkt Angewandte Tumorvirologie, Deutsches Krebsforschungszentrum, Heidelberg, Germany
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35
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Christensen J, Storgaard T, Bloch B, Alexandersen S, Aasted B. Expression of Aleutian mink disease parvovirus proteins in a baculovirus vector system. J Virol 1993; 67:229-38. [PMID: 8380073 PMCID: PMC237356 DOI: 10.1128/jvi.67.1.229-238.1993] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
We have previously published a detailed transcription map of Aleutian mink disease parvovirus (ADV) and proposed a model for the translation of the two virion structural proteins (VP1 and VP2) and three nonstructural proteins (NS-1, NS-2, and NS-3) (S. Alexandersen, M. E. Bloom, and S. Perryman, J. Virol. 62:3684-3994, 1988). To verify and further characterize this model, we cloned the predicted open reading frames for NS-1, NS-2, NS-3, VP1-VP2, and VP2 alone into a recombinant baculovirus and expressed them in Sf9 insect cells. Expression of VP1-VP2 or VP2 alone in cDNA and in the genomic form was achieved. The expressed proteins had molecular weights similar to those of the corresponding proteins of wild-type ADV-G, although the ratio of VP1 to VP2 was altered. The recombinant baculovirus-expressed ADV VP1 and VP2 showed nuclear localization in Sf9 cells and were able to form particles indistinguishable, by electron microscopy, from wild-type virus. The large nonstructural protein, NS-1, showed predominantly nuclear localization in Sf9 cells when analyzed by immunofluorescence and had a molecular weight similar to that of wild-type ADV NS-1. Moreover, expression of NS-1 in Sf9 cells caused a change in morphology of the cells and resulted in 10-times-lower titers of recombinant baculovirus during infection, suggesting a cytostatic or cytotoxic action of this protein. The smaller NS-2 gene product seems to be located in the cytoplasm. When analyzed by Western immunoblotting, NS-2 comigrated with an approximately 16-kDa band seen in lysates of ADV-infected feline kidney cells. The putative NS-3 gene product exhibited a diffuse distribution in Sf9 cells and had a molecular weight of approximately 10,000. All of the expressed ADV-encoded proteins were recognized by sera from ADV-infected mink. Thus, expression of ADV cDNAs allowed assignment of the different mRNAs to the viral proteins observed during ADV infection in cell culture and supported our previously proposed ADV transcriptional and translational scheme. Moreover, the production of structural proteins from a full-length NS-2 mRNA may add to the repertoire of parvovirus gene expression.
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Affiliation(s)
- J Christensen
- Department of Veterinary Microbiology, Royal Veterinary and Agricultural University of Copenhagen, Frederiksberg, Denmark
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36
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Abstract
Adeno-associated virus is a human parvovirus that integrates its DNA genome into host cell chromosomes with very high efficiency. This suggests that adeno-associated virus may be a useful vector for human gene therapy. Interest in adeno-associated virus vectors increased greatly in the last year following reports that adeno-associated virus genome integration may be site specific and occur at preferred sites in the human genome. Several genes relevant to the treatment of genetic or infectious diseases have been expressed in adeno-associated virus vectors in vitro.
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Affiliation(s)
- B J Carter
- Targeted Genetics Corporation, Seattle, Washington
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37
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Walz C, Schlehofer JR. Modification of some biological properties of HeLa cells containing adeno-associated virus DNA integrated into chromosome 17. J Virol 1992; 66:2990-3002. [PMID: 1313913 PMCID: PMC241058 DOI: 10.1128/jvi.66.5.2990-3002.1992] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Parvoviruses are known to interfere with cellular transformation and carcinogenesis. Since infecting adeno-associated virus (AAV) frequently integrates its DNA into the cellular genome, we analyzed whether this integration influences the transformed phenotype of the human tumor cell line HeLa. Analysis of three independent HeLa cell clones with integrated AAV DNA (HA-3x, HA-16, and HA-28) revealed the following phenotypic changes of these cells: (i) reduced growth rate, (ii) increased serum requirement, (iii) reduced capacity for colony formation in soft agar, (iv) reduced cloning efficiency on plastic, (v) elevated sensitivity to genotoxic agents (N-methyl-N'-nitro-N-nitrosoguanidine, 7,12-dimethylbenz[a]anthracene, human tumor necrosis factor alpha, UV irradiation [256 nm], and heat [42 degrees C]), and (vi) reduced sensitivity to the cytolytic effect of parvovirus H-1. Reduced growth rate and enhanced sensitivity to gamma irradiation were also observed in vivo when tumors from AAV DNA-containing HeLa cells were transplanted into nude mice. This alteration of the biological properties of HeLa cells was independent of the number of AAV genomes integrated, the physical structure of integrated AAV DNA, and the transcription of AAV genes. Integration of AAV DNA was found to occur preferentially on the long arm of chromosome 17 in the three HeLa cell clones analyzed. These findings demonstrate that genomic integration of AAV DNA can alter the biological properties of human tumor cells.
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Affiliation(s)
- C Walz
- Angewandte Tumorvirologie, Deutsches Krebsforschungszentrum, Heidelberg, Germany
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