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López-Codony V, de Andrés-Pablo Á, Ferrando-Díez A, Fernández-Montolí ME, López-Querol M, Tous S, Ortega-Expósito C, Torrejón-Becerra JC, Pérez Y, Ferrer-Artola A, Sole-Sedeno JM, Grau C, Rupérez B, Saumoy M, Sánchez M, Peremiquel-Trillas P, Bruni L, Alemany L, Bosch FX, Pavón MA. Assessing the reduction of viral infectivity in HPV16/18-positive women after one, two, and three doses of Gardasil-9 (RIFT): Study protocol. PLoS One 2024; 19:e0304080. [PMID: 38768231 PMCID: PMC11104652 DOI: 10.1371/journal.pone.0304080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 04/30/2024] [Indexed: 05/22/2024] Open
Abstract
Human Papillomavirus (HPV) prophylactic vaccination has proven effective in preventing new infections, but it does not treat existing HPV infections or associated diseases. Hence, there is still an important reservoir of HPV in adults, as vaccination programs are mainly focused on young women. The primary objective of this non-randomized, open-label trial is to evaluate if a 3-dose regimen of Gardasil-9 in HPV16/18-positive women could reduce the infective capacity of their body fluids. We aim to assess if vaccine-induced antibodies could neutralize virions present in the mucosa, thus preventing the release of infective particles and HPV transmission to sexual partners. As our main endpoint, the E1^E4-HaCaT model will be used to assess the infectivity rate of cervical, anal and oral samples, obtained from women before and after vaccination. HPV DNA positivity, virion production, seroconversion, and the presence of antibodies in the exudates, will be evaluated to attribute infectivity reduction to vaccination. Our study will recruit two different cohorts (RIFT-HPV1 and RIFT-HPV2) of non-vaccinated adult women. RIFT-HPV1 will include subjects with an HPV16/18 positive cervical test and no apparent cervical lesions or cervical lesions eligible for conservative treatment. RIFT-HPV2 will include subjects with an HPV16/18 positive anal test and no apparent anal lesions or anal lesions eligible for conservative treatment, as well as women with an HPV16/18 positive cervical test and HPV-associated vulvar lesions. Subjects complying with inclusion criteria for both cohorts will be recruited to the main cohort, RIFT-HPV1. Three doses of Gardasil-9 will be administered intramuscularly at visit 1 (0 months), visit 2 (2 months) and visit 3 (6 months). Even though prophylactic HPV vaccines would not eliminate a pre-existing infection, our results will determine if HPV vaccination could be considered as a new complementary strategy to prevent HPV-associated diseases by reducing viral spread. Trial registration: https://clinicaltrials.gov/ct2/show/NCT05334706.
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MESH Headings
- Humans
- Female
- Papillomavirus Infections/prevention & control
- Papillomavirus Infections/virology
- Papillomavirus Infections/immunology
- Human Papillomavirus Recombinant Vaccine Quadrivalent, Types 6, 11, 16, 18/administration & dosage
- Human Papillomavirus Recombinant Vaccine Quadrivalent, Types 6, 11, 16, 18/immunology
- Human papillomavirus 16/immunology
- Human papillomavirus 18/immunology
- Adult
- Young Adult
- Adolescent
- Antibodies, Viral/immunology
- Papillomavirus Vaccines/administration & dosage
- Papillomavirus Vaccines/immunology
- DNA, Viral
- Vaccination/methods
- Cervix Uteri/virology
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Affiliation(s)
- Victoria López-Codony
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Programa de Doctorat en Biomedicina, Universitat de Barcelona (UB), Barcelona, Spain
| | - Álvaro de Andrés-Pablo
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Programa de Doctorat en Biomedicina, Universitat de Barcelona (UB), Barcelona, Spain
| | - Angelica Ferrando-Díez
- Medical Oncology Department, Catalan Institute of Oncology, Germans Trias i Pujol University Hospital (HGTiP), Badalona, Barcelona, Spain
| | | | - Marta López-Querol
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
| | - Sara Tous
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Biomedical Research Networking Center for Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Carlos Ortega-Expósito
- Department of Gynaecology, Bellvitge University Hospital (HUB), L’Hospitalet de Llobregat, Barcelona, Spain
| | | | - Yolanda Pérez
- Department of Gynaecology, Bellvitge University Hospital (HUB), L’Hospitalet de Llobregat, Barcelona, Spain
| | - Anna Ferrer-Artola
- Bellvitge Biomedical Research Institute (IDIBELL), Pharmacy Unit, Bellvitge University Hospital (HUB), L’Hospitalet de Llobregat, Barcelona, Spain
| | - Josep Maria Sole-Sedeno
- Department of Obstetrics and Gynaecology, Hospital del Mar–Mar Health Park, Barcelona, Spain
| | - Clara Grau
- Sexual and Reproductive Health Care Center–ASSIR, Delta del Llobregat, Barcelona, Spain
| | - Blas Rupérez
- Sexual and Reproductive Health Care Center–ASSIR, Delta del Llobregat, Barcelona, Spain
| | - Maria Saumoy
- HIV and STD Unit, Bellvitge University Hospital (HUB), Bellvitge Biomedical Research Institute (IDIBELL), L’Hospitalet de Llobregat, Barcelona, Spain
| | - Mónica Sánchez
- HIV and STD Unit, Bellvitge University Hospital (HUB), Bellvitge Biomedical Research Institute (IDIBELL), L’Hospitalet de Llobregat, Barcelona, Spain
| | - Paula Peremiquel-Trillas
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Programa de Doctorat en Biomedicina, Universitat de Barcelona (UB), Barcelona, Spain
- Biomedical Research Networking Center for Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Laia Bruni
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Biomedical Research Networking Center for Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Laia Alemany
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Biomedical Research Networking Center for Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Francesc Xavier Bosch
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Biomedical Research Networking Center for Epidemiology and Public Health (CIBERESP), Madrid, Spain
- Faculty of Health Sciences, Open University of Catalonia (UOC), Barcelona, Spain
| | - Miquel Angel Pavón
- Catalan Institute of Oncology, Bellvitge Biomedical Research Institute (IDIBELL), Cancer Epidemiology Research Programme, L’Hospitalet de Llobregat, Barcelona, Spain
- Biomedical Research Networking Center for Epidemiology and Public Health (CIBERESP), Madrid, Spain
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Egawa N, Shiraz A, Crawford R, Saunders-Wood T, Yarwood J, Rogers M, Sharma A, Eichenbaum G, Doorbar J. Dynamics of papillomavirus in vivo disease formation & susceptibility to high-level disinfection-Implications for transmission in clinical settings. EBioMedicine 2021; 63:103177. [PMID: 33421945 PMCID: PMC7806788 DOI: 10.1016/j.ebiom.2020.103177] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/20/2020] [Accepted: 12/04/2020] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND High-level disinfection protects tens-of-millions of patients from the transmission of viruses on reusable medical devices. The efficacy of high-level disinfectants for preventing human papillomavirus (HPV) transmission has been called into question by recent publications, which if true, would have significant public health implications. METHODS Evaluation of the clinical relevance of these published findings required the development of novel methods to quantify and compare: (i) Infectious titres of lab-produced, clinically-sourced, and animal-derived papillomaviruses, (ii) The papillomavirus dose responses in the newly developed in vitro and in vivo models, and the kinetics of in vivo disease formation, and (iii) The efficacy of high-level disinfectants in inactivating papillomaviruses in these systems. FINDINGS Clinical virus titres obtained from cervical lesions were comparable to those obtained from tissue (raft-culture) and in vivo models. A mouse tail infection model showed a clear dose-response for disease formation, that papillomaviruses remain stable and infective on fomite surfaces for at least 8 weeks without squames and up to a year with squames, and that there is a 10-fold drop in virus titre with transfer from a fomite surface to a new infection site. Disinfectants such as ortho-phthalaldehyde and hydrogen peroxide, but not ethanol, were highly effective at inactivating multiple HPV types in vitro and in vivo. INTERPRETATION Together with comparable results presented in a companion manuscript from an independent laboratory, this work demonstrates that high-level disinfectants inactivate HPV and highlights the need for standardized and well-controlled methods to assess HPV transmission and disinfection. FUNDING Advanced Sterilization Products, UK-MRC (MR/S024409/1 and MC-PC-13050) and Addenbrookes Charitable Trust.
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Affiliation(s)
- Nagayasu Egawa
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QP, UK
| | - Aslam Shiraz
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QP, UK
| | - Robin Crawford
- Department of Gynae-Oncology, Cambridge University Hospitals, Cambridge, CB2 0QQ, UK
| | - Taylor Saunders-Wood
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QP, UK
| | - Jeremy Yarwood
- Advanced Sterilization Products, Inc., 33 Technology Drive, Irvine, CA 926184, USA
| | - Marc Rogers
- Advanced Sterilization Products, Inc., 33 Technology Drive, Irvine, CA 926184, USA
| | - Ankur Sharma
- Advanced Sterilization Products, Inc., 33 Technology Drive, Irvine, CA 926184, USA
| | - Gary Eichenbaum
- Johnson & Johnson, Office of the Chief Medical Officer, 410 George Street, New Brunswick, NJ, 08901, USA
| | - John Doorbar
- Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QP, UK.
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Ozbun MA, Bondu V, Patterson NA, Sterk RT, Waxman AG, Bennett EC, McKee R, Sharma A, Yarwood J, Rogers M, Eichenbaum G. Infectious titres of human papillomaviruses (HPVs) in patient lesions, methodological considerations in evaluating HPV infectivity and implications for the efficacy of high-level disinfectants. EBioMedicine 2021; 63:103165. [PMID: 33422988 PMCID: PMC7808919 DOI: 10.1016/j.ebiom.2020.103165] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 11/07/2020] [Accepted: 11/27/2020] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Recent publications from a single research group have suggested that aldehyde-based high-level disinfectants (HLDs), such as ortho-phthalaldehyde (OPA), are not effective at inactivating HPVs and that therefore, patients may be at risk of HPV infection from medical devices. These results could have significant public health consequences and therefore necessitated evaluation of their reproducibility and clinical relevance. METHODS We developed methods and used standardised controls to: (1) quantify the infectious levels of clinically-sourced HPVs from patient lesions and compare them to laboratory-derived HPVs, (2) evaluate experimental factors that should be controlled to ensure consistent and reproducible infectivity measurements of different HPV genotypes, and (3) determine the efficacy of select HLDs. FINDINGS A novel focus forming unit (FFU) infectivity assay demonstrated that exfoliates from patient anogenital lesions and respiratory papillomas yielded infectious HPV burdens up to 2.7 × 103 FFU; therefore, using 2.2 × 102 to 1.0 × 104 FFU of laboratory-derived HPVs in disinfection assays provides a relevant range for clinical exposures. RNase and neutralising antibody sensitivities were used to ensure valid infectivity measures of tissue-derived and recombinant HPV preparations. HPV infectivity was demonstrated over a dynamic range of 4-5 log10; and disinfection with OPA and hypochlorite was achieved over 3 to >4 log10 with multiple genotypes of tissue-derived and recombinant HPV isolates. INTERPRETATION This work, along with a companion publication from an independent lab in this issue, address a major public health question by showing that HPVs are susceptible to HLDs. FUNDING Advanced Sterilization Products; US NIH (R01CA207368, U19AI084081, P30CA118100).
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Affiliation(s)
- Michelle A Ozbun
- Department of Molecular Genetics & Microbiology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States; Department of Obstetrics & Gynecology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States; The University of New Mexico Comprehensive Cancer Center, Albuquerque, NM 87131, United States.
| | - Virginie Bondu
- Department of Molecular Genetics & Microbiology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Nicole A Patterson
- Department of Molecular Genetics & Microbiology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Rosa T Sterk
- Department of Molecular Genetics & Microbiology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Alan G Waxman
- Department of Obstetrics & Gynecology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Erica C Bennett
- Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Rohini McKee
- Department of Surgery, Division of General Surgery, The University of New Mexico School of Medicine, Albuquerque, NM 87131, United States
| | - Ankur Sharma
- Advanced Sterilization Products, Inc., 33 Technology Drive, Irvine, CA 92618, United States
| | - Jeremy Yarwood
- Advanced Sterilization Products, Inc., 33 Technology Drive, Irvine, CA 92618, United States
| | - Marc Rogers
- Advanced Sterilization Products, Inc., 33 Technology Drive, Irvine, CA 92618, United States
| | - Gary Eichenbaum
- Johnson & Johnson, Office of the Chief Medical Officer, 410 George Street, New Brunswick, NJ 08901, United States
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Young JM, Zine El Abidine A, Gómez-Martinez RA, Ozbun MA. The Known and Potential Intersections of Rab-GTPases in Human Papillomavirus Infections. Front Cell Dev Biol 2019; 7:139. [PMID: 31475144 PMCID: PMC6702953 DOI: 10.3389/fcell.2019.00139] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Accepted: 07/09/2019] [Indexed: 12/16/2022] Open
Abstract
Papillomaviruses (PVs) were the first viruses recognized to cause tumors and cancers in mammalian hosts by Shope, nearly a century ago (Shope and Hurst, 1933). Over 40 years ago, zur Hausen (1976) first proposed that human papillomaviruses (HPVs) played a role in cervical cancer; in 2008, he shared the Nobel Prize in Medicine for his abundant contributions demonstrating the etiology of HPVs in genital cancers. Despite effective vaccines and screening, HPV infection and morbidity remain a significant worldwide burden, with HPV infections and HPV-related cancers expected increase through 2040. Although HPVs have long-recognized roles in tumorigenesis and cancers, our understanding of the molecular mechanisms by which these viruses interact with cells and usurp cellular processes to initiate infections and produce progeny virions is limited. This is due to longstanding challenges in both obtaining well-characterized infectious virus stocks and modeling tissue-based infection and the replicative cycles in vitro. In the last 20 years, the development of methods to produce virus-like particles (VLPs) and pseudovirions (PsV) along with more physiologically relevant cell- and tissue-based models has facilitated progress in this area. However, many questions regarding HPV infection remain difficult to address experimentally and are, thus, unanswered. Although an obligatory cellular uptake receptor has yet to be identified for any PV species, Rab-GTPases contribute to HPV uptake and transport of viral genomes toward the nucleus. Here, we provide a general overview of the current HPV infection paradigm, the epithelial differentiation-dependent HPV replicative cycle, and review the specifics of how HPVs usurp Rab-related functions during infectious entry. We also suggest other potential interactions based on how HPVs alter cellular activities to complete their replicative-cycle in differentiating epithelium. Understanding how HPVs interface with Rab functions during their complex replicative cycle may provide insight for the development of therapeutic interventions, as current viral counter-measures are solely prophylactic and therapies for HPV-positive individuals remain archaic and limited.
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Affiliation(s)
- Jesse M. Young
- Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, UNM Comprehensive Cancer Center, Albuquerque, NM, United States
| | - Amira Zine El Abidine
- Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, UNM Comprehensive Cancer Center, Albuquerque, NM, United States
| | - Ricardo A. Gómez-Martinez
- Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, UNM Comprehensive Cancer Center, Albuquerque, NM, United States
- Department of Obstetrics & Gynecology, University of New Mexico School of Medicine, UNM Comprehensive Cancer Center, Albuquerque, NM, United States
| | - Michelle A. Ozbun
- Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, UNM Comprehensive Cancer Center, Albuquerque, NM, United States
- Department of Obstetrics & Gynecology, University of New Mexico School of Medicine, UNM Comprehensive Cancer Center, Albuquerque, NM, United States
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5
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Three-dimensional cell culture models for investigating human viruses. Virol Sin 2016; 31:363-379. [PMID: 27822716 PMCID: PMC7090760 DOI: 10.1007/s12250-016-3889-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Accepted: 10/21/2016] [Indexed: 12/15/2022] Open
Abstract
Three-dimensional (3D) culture models are physiologically relevant, as they provide reproducible results, experimental flexibility and can be adapted for high-throughput experiments. Moreover, these models bridge the gap between traditional two-dimensional (2D) monolayer cultures and animal models. 3D culture systems have significantly advanced basic cell science and tissue engineering, especially in the fields of cell biology and physiology, stem cell research, regenerative medicine, cancer research, drug discovery, and gene and protein expression studies. In addition, 3D models can provide unique insight into bacteriology, virology, parasitology and host-pathogen interactions. This review summarizes and analyzes recent progress in human virological research with 3D cell culture models. We discuss viral growth, replication, proliferation, infection, virus-host interactions and antiviral drugs in 3D culture models.
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Wang HK, Broker TR, Chow LT. Robust HPV-18 production in organotypic cultures of primary human keratinocytes. Methods Mol Biol 2015; 1249:93-109. [PMID: 25348300 DOI: 10.1007/978-1-4939-2013-6_7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The productive program of the human papillomaviruses takes place in terminally differentiating squamous epithelia. In this chapter, we provide the protocols for robust production of HPV-18 in organotypic cultures of early passages of primary human keratinocytes. A critical step is the generation of genomic HPV plasmids in vivo by using Cre-loxP-mediated excisional recombination from a vector plasmid. We discuss the rationale for this approach. This system produces high yields of infectious virus and facilitates genetic analyses of HPV protein functions and their regulation in the context of recapitulated host tissue environment.
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Affiliation(s)
- Hsu-Kun Wang
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL, 35294-0005, USA
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Ozbun MA, Patterson NA. Using organotypic (raft) epithelial tissue cultures for the biosynthesis and isolation of infectious human papillomaviruses. ACTA ACUST UNITED AC 2014; 34:14B.3.1-18. [PMID: 25082004 DOI: 10.1002/9780471729259.mc14b03s34] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Papillomaviruses have a strict tropism for epithelial cells, and they are fully reliant on cellular differentiation for completion of their life cycles, resulting in the production of progeny virions. Thus, a permissive environment for full viral replication in vitro-wherein virion morphogenesis occurs under cooperative viral and cellular cues-requires the cultivation of epithelium. Presented in the first section of this unit is a protocol to grow differentiating epithelial tissues that mimic many important morphological and biochemical aspects of normal skin. The technique involves growing epidermal cells atop a dermal equivalent consisting of live fibroblasts and a collagen lattice. Epithelial stratification and differentiation ensues when the keratinocyte-dermal equivalent is placed at the air-liquid interface. The apparent floating nature of the cell-matrix in this method led to the nickname "raft" cultures. The general technique can be applied to normal low passage keratinocytes, to cells stably transfected with papillomavirus genes or genomes, or keratinocytes established from neoplastic lesions. However, infectious papillomavirus particles have only been isolated from organotypic epithelial cultures initiated with cells that maintain oncogenic human papillomavirus genomes in an extrachomosomal replicative form. The second section of this unit is dedicated to a virion isolation method that minimizes aerosol and skin exposure to these human carcinogens. Although the focus of the protocols is on the growth of tissues that yields infectious papillomavirus progeny, this culture system facilitates the investigation of these fastidious viruses during their complex replicative cycles, and raft tissues can be manipulated and harvested at any point during the process. Importantly, a single-step virus growth cycle is achieved in this process, as it is unlikely that progeny virions are released to initiate subsequent rounds of infection.
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Affiliation(s)
- Michelle A Ozbun
- Department of Molecular Genetics and Microbiology, The University of New Mexico School of Medicine, The UNM Cancer Center, Albuquerque, New Mexico
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8
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Luff JA, Yuan H, Kennedy D, Schlegel R, Felsburg P, Moore PF. Keratinocyte antiviral response to Poly(dA:dT) stimulation and papillomavirus infection in a canine model of X-linked severe combined immunodeficiency. PLoS One 2014; 9:e102033. [PMID: 25025687 PMCID: PMC4099134 DOI: 10.1371/journal.pone.0102033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 06/13/2014] [Indexed: 11/24/2022] Open
Abstract
X-linked severe combined immunodeficiency (XSCID) is caused by a genetic mutation within the common gamma chain (γc), an essential component of the cytokine receptors for interleukin (IL)-2, IL-4, IL-7, IL-9, IL-15, and IL-21. XSCID patients are most commonly treated with bone marrow transplants (BMT) to restore systemic immune function. However, BMT-XSCID humans and dogs remain at an increased risk for development of cutaneous papillomavirus (PV) infections and their associated neoplasms, most typically cutaneous papillomas. Since basal keratinocytes are the target cell for the initial PV infection, we wanted to determine if canine XSCID keratinocytes have a diminished antiviral cytokine response to poly(dA:dT) and canine papillomavirus-2 (CPV-2) upon initial infection. We performed quantitative RT-PCR for antiviral cytokines and downstream interferon stimulated genes (ISG) on poly(dA:dT) stimulated and CPV-2 infected monolayer keratinocyte cultures derived from XSCID and normal control dogs. We found that XSCID keratinocytes responded similarly to poly(dA:dT) as normal keratinocytes by upregulating antiviral cytokines and ISGs. CPV-2 infection of both XSCID and normal keratinocytes did not result in upregulation of antiviral cytokines or ISGs at 2, 4, or 6 days post infection. These data suggest that the antiviral response to initial PV infection of basal keratinocytes is similar between XSCID and normal patients, and is not the likely source for the remaining immunodeficiency in XSCID patients.
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Affiliation(s)
- Jennifer A Luff
- Department of Veterinary Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California Davis, Davis, California, United States of America
| | - Hang Yuan
- Department of Pathology, Georgetown University Medical School, Washington, D.C., United States of America
| | - Douglas Kennedy
- Department of Immunology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Richard Schlegel
- Department of Pathology, Georgetown University Medical School, Washington, D.C., United States of America
| | - Peter Felsburg
- Department of Immunology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Peter F Moore
- Department of Veterinary Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California Davis, Davis, California, United States of America
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Dunne EF, Markowitz LE, Taylor LD, Unger ER, Wheeler CM. Human papilloma virions in the laboratory. J Clin Virol 2014; 61:196-8. [PMID: 25088765 DOI: 10.1016/j.jcv.2014.06.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 05/27/2014] [Accepted: 06/14/2014] [Indexed: 01/10/2023]
Abstract
Carcinogenic human papillomaviruses (HPV) can cause cervical, vaginal, vulvar, penile, anal, and oropharyngeal cancers. Non-carcinogenic HPVs can cause anogenital warts and recurrent respiratory papillomatosis. Currently, few research laboratories propagate, isolate or generate papilloma virions. However, there have been questions about potential exposure and risk in this setting. In this brief note, we discuss the use of wild type and laboratory-generated virions in research laboratories, potential routes of laboratory exposure, and considerations for HPV vaccination of laboratory personnel.
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Affiliation(s)
- Eileen F Dunne
- Division of STD Prevention, National Center for HIV, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Lauri E Markowitz
- Division of STD Prevention, National Center for HIV, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - La'shan D Taylor
- Division of STD Prevention, National Center for HIV, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA; Epidemic Intelligence Service Fellow (EIS), Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Elizabeth R Unger
- Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Cosette M Wheeler
- Departments of Pathology and Obstetrics and Gynecology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA.
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10
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Selinka HC, Sapp M. Papillomavirus/cell-interactions initiating the infectious entry pathway. ACTA ACUST UNITED AC 2013. [DOI: 10.1179/095741903225003235] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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11
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The evolving field of human papillomavirus receptor research: a review of binding and entry. J Virol 2013; 87:6062-72. [PMID: 23536685 DOI: 10.1128/jvi.00330-13] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Human papillomaviruses (HPVs) infect epithelia and can lead to the development of lesions, some of which have malignant potential. HPV type 16 (HPV16) is the most oncogenic genotype and causes various types of cancer, including cervical, anal, and head and neck cancers. However, despite significant research, our understanding of the mechanism by which HPV16 binds to and enters host cells remains fragmented. Over several decades, many HPV receptors and entry pathways have been described. This review puts those studies into context and offers a model of HPV16 binding and entry as a framework for future research. Our model suggests that HPV16 binds to heparin sulfate proteoglycans (HSPGs) on either the epithelial cell surface or basement membrane through interactions with the L1 major capsid protein. Growth factor receptors may also become activated through HSPG/growth factor/HPV16 complexes that initiate signaling cascades during early virion-host cell interactions. After binding to HSPGs, the virion undergoes conformational changes, leading to isomerization by cyclophilin B and proprotein convertase-mediated L2 minor capsid protein cleavage that increases L2 N terminus exposure. Along with binding to HSPGs, HPV16 binds to α6 integrins, which initiate further intracellular signaling events. Following these primary binding events, HPV16 binds to a newly identified L2-specific receptor, the annexin A2 heterotetramer. Subsequently, clathrin-, caveolin-, lipid raft-, flotillin-, cholesterol-, and dynamin-independent endocytosis of HPV16 occurs.
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Luff JA, Yuan H, Suter MM, Müller EJ, Schlegel R, Moore PF. Canine keratinocytes upregulate type I interferons and proinflammatory cytokines in response to poly(dA:dT) but not to canine papillomavirus. Vet Immunol Immunopathol 2013; 153:177-86. [PMID: 23557936 DOI: 10.1016/j.vetimm.2013.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2012] [Revised: 01/25/2013] [Accepted: 02/04/2013] [Indexed: 01/11/2023]
Abstract
Papillomaviruses (PV) are double stranded (ds) DNA viruses that infect epithelial cells within the skin or mucosa, most often causing benign neoplasms that spontaneously regress. The immune system plays a key role in the defense against PVs. Since these viruses infect keratinocytes, we wanted to investigate the role of the keratinocyte in initiating an immune response to canine papillomavirus-2 (CPV-2) in the dog. Keratinocytes express a variety of pattern recognition receptors (PRR) to distinguish different cutaneous pathogens and initiate an immune response. We examined the mRNA expression patterns for several recently described cytosolic nucleic acid sensing PRRs in canine monolayer keratinocyte cultures using quantitative reverse transcription-polymerase chain reaction. Unstimulated normal cells were found to express mRNA for melanoma differentiation associated gene 5 (MDA5), retinoic acid-inducible gene I (RIG-I), DNA-dependent activation of interferon regulatory factors, leucine rich repeat flightless interacting protein 1, and interferon inducible gene 16 (IFI16), as well as their adaptor molecules myeloid differentiation primary response gene 88, interferon-β promoter stimulator 1, and endoplasmic reticulum-resident transmembrane protein stimulator of interferon genes. When stimulated with synthetic dsDNA [poly(dA:dT)] or dsRNA [poly(I:C)], keratinocytes responded with increased mRNA expression levels for interleukin-6, tumor necrosis factor-α, interferon-β, RIG-I, IFI16, and MDA5. There was no detectable increase in mRNA expression, however, in keratinocytes infected with CPV-2. Furthermore, CPV-2-infected keratinocytes stimulated with poly(dA:dT) and poly(I:C) showed similar mRNA expression levels for these gene products when compared with expression levels in uninfected cells. These results suggest that although canine keratinocytes contain functional PRRs that can recognize and respond to dsDNA and dsRNA ligands, they do not appear to recognize or initiate a similar response to CPV-2.
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Affiliation(s)
- Jennifer A Luff
- Department of Veterinary Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.
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Florin L, Sapp M, Spoden GA. Host-cell factors involved in papillomavirus entry. Med Microbiol Immunol 2012; 201:437-48. [PMID: 22972234 DOI: 10.1007/s00430-012-0270-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 08/27/2012] [Indexed: 12/21/2022]
Abstract
Papillomaviruses infect skin and mucosa where they induce warts and cancers. For entry to occur, they sequentially engage numerous host proteins, allowing them to deliver their genetic information into target cells. This multistep process starts with initial binding via its L1 major capsid protein, followed by structural changes of the capsid on the cell surface, engagement of different receptors, and endocytosis. The post-entry phase includes capsid disassembly, endosomal escape of a complex of the minor capsid protein L2 and the viral genome, its transport into the nucleus, and accumulation at nuclear substructures. This review summarizes the current knowledge of the papillomavirus entry pathway and the role of cellular proteins involved in this course of events.
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Affiliation(s)
- Luise Florin
- Department of Medical Microbiology and Hygiene, University Medical Centre of the Johannes Gutenberg University, Obere Zahlbacher Strasse 67, 55131 Mainz, Germany.
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14
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Surviladze Z, Dziduszko A, Ozbun MA. Essential roles for soluble virion-associated heparan sulfonated proteoglycans and growth factors in human papillomavirus infections. PLoS Pathog 2012; 8:e1002519. [PMID: 22346752 PMCID: PMC3276557 DOI: 10.1371/journal.ppat.1002519] [Citation(s) in RCA: 137] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Accepted: 12/19/2011] [Indexed: 12/12/2022] Open
Abstract
A subset of human papillomavirus (HPV) infections is causally related to the development of human epithelial tumors and cancers. Like a number of pathogens, HPV entry into target cells is initiated by first binding to heparan sulfonated proteoglycan (HSPG) cell surface attachment factors. The virus must then move to distinct secondary receptors, which are responsible for particle internalization. Despite intensive investigation, the mechanism of HPV movement to and the nature of the secondary receptors have been unclear. We report that HPV16 particles are not liberated from bound HSPG attachment factors by dissociation, but rather are released by a process previously unreported for pathogen-host cell interactions. Virus particles reside in infectious soluble high molecular weight complexes with HSPG, including syndecan-1 and bioactive compounds, like growth factors. Matrix mellatoproteinase inhibitors that block HSPG and virus release from cells interfere with virus infection. Employing a co-culture assay, we demonstrate HPV associated with soluble HSPG-growth factor complexes can infect cells lacking HSPG. Interaction of HPV-HSPG-growth factor complexes with growth factor receptors leads to rapid activation of signaling pathways important for infection, whereas a variety of growth factor receptor inhibitors impede virus-induced signaling and infection. Depletion of syndecan-1 or epidermal growth factor and removal of serum factors reduce infection, while replenishment of growth factors restores infection. Our findings support an infection model whereby HPV usurps normal host mechanisms for presenting growth factors to cells via soluble HSPG complexes as a novel method for interacting with entry receptors independent of direct virus-cell receptor interactions. A subset of the >120 different types of human papillomaviruses (HPVs) are the most common cause of sexually transmitted infections. Certain HPVs are also associated with approximately 5% of all cancers worldwide. Like many pathogens, HPVs bind first to heparan sulfate proteoglycans (HSPGs) on cells before moving to more specific uptake receptors. However, relatively little is known about the mechanism(s) that triggers the translocation of HPV from HSPGs to the receptors that facilitate entry. As obligate parasites, viruses have evolved numerous means to hijack host cell functions to cause infection. We report two novel mechanisms of pathogen-host interactions. First, bound HPV particles are liberated from cells in an active complex with HSPGs and growth factors rather than dissociating from the sugars to engage secondary receptors. Second, HPV uses the specificity of the associated growth factors to bridge to their cognate receptors as opposed to direct binding to a cell internalization receptor. Signals transduced during these interactions are important for HPV infection. Our study provides new insights into the transmission of a significant viral pathogen and reveals novel means whereby microbes may repurpose normal cell functions during infection of their hosts. Likewise, this work uncovers new targets for HPV prophylaxis.
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Affiliation(s)
- Zurab Surviladze
- Department of Molecular Genetics & Microbiology, University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America
- * E-mail: (ZS); (MAO)
| | - Agnieszka Dziduszko
- Department of Molecular Genetics & Microbiology, University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America
| | - Michelle A. Ozbun
- Department of Molecular Genetics & Microbiology, University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America
- * E-mail: (ZS); (MAO)
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15
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Abstract
During embryonic development, the skin, the largest organ of the human body, and nervous system are both derived from the neuroectoderm. Consequently, several key factors and mechanisms that influence and control central or peripheral nervous system activities are also present and hence involved in various regulatory mechanisms of the skin. Apparently, this is the case for the ion and non-ion selective channels as well. Therefore, in this review, we shall focus on delineating the regulatory roles of the channels in skin physiology and pathophysiology. First, we introduce key cutaneous functions and major characteristics of the channels in question. Then, we systematically detail the involvement of a multitude of channels in such skin processes (e.g. skin barrier formation, maintenance, and repair, immune mechanisms, exocrine secretion) which are mostly defined by cutaneous non-neuronal cell populations. Finally, we close by summarizing data suggesting that selected channels are also involved in skin diseases such as e.g. atopic dermatitis, psoriasis, non-melanoma cancers and malignant melanoma, genetic and autoimmune diseases, etc., as well as in skin ageing.
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Affiliation(s)
- Attila Oláh
- DE-MTA Lendület Cellular Physiology Research Group, Department of Physiology, University of Debrecen, Medical and Health Science Center, Research Center for Molecular Medicine, Nagyerdei krt. 98, H-4032, Debrecen, Hungary
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16
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D'Abramo CM, Archambault J. Small molecule inhibitors of human papillomavirus protein - protein interactions. Open Virol J 2011; 5:80-95. [PMID: 21769307 PMCID: PMC3137155 DOI: 10.2174/1874357901105010080] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Revised: 05/23/2011] [Accepted: 06/13/2011] [Indexed: 02/06/2023] Open
Abstract
Human papillomaviruses (HPV) have now been identified as a necessary cause of benign and malignant lesions of the differentiating epithelium, particularly cervical cancer, the second most prevalent cancer in women worldwide. While two prophylactic HPV vaccines and screening programs are available, there is currently no antiviral drug for the treatment of HPV infections and associated diseases. The recent progress toward the identification and characterization of specific molecular targets for small molecule-based approaches provides prospect for the development of effective HPV antiviral compounds. Traditionally, antiviral therapies target viral enzymes. HPV encode for few proteins, however, and rely extensively on the infected cell for completion of their life cycle. This article will review the functions of the viral E1 helicase, which encodes the only enzymatic function of the virus, of the E2 regulatory protein, and of the viral E6 and E7 oncogenes in viral replication and pathogenesis. Particular emphasis will be placed on the recent progress made towards the development of novel small molecule inhibitors that specifically target and inhibit the functions of these viral proteins, as well as their interactions with other viral and/or cellular proteins.
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Affiliation(s)
- C M D'Abramo
- Laboratory of Molecular Virology, Institut de Recherches Cliniques de Montréal and Department of Biochemistry, Université de Montréal, Montreal, Quebec, Canada
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17
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Chen HS, Conway MJ, Christensen ND, Alam S, Meyers C. Papillomavirus capsid proteins mutually impact structure. Virology 2011; 412:378-83. [PMID: 21329956 DOI: 10.1016/j.virol.2011.01.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Revised: 12/06/2010] [Accepted: 01/14/2011] [Indexed: 02/08/2023]
Abstract
We studied a panel of mutant viruses containing wild-type and chimeric capsid HPV16 and HPV18 proteins. The mutant capsid protein expression, genome amplification, and episomal maintenance were comparable with the wild-type virus. However, the chimeric viruses varied in their titers from wild-type. We show that the intertypical mutant chimeric capsid viruses, that L2 affects the structure of L1 and that L1 affects the structure of L2 in the virion. These effects were measured using a panel of conformation-dependent neutralizing L1 MAbs and an L2 capsid surface peptide derived neutralizing antibody. These data suggest that variation of one capsid gene not only affects its own structure and antigenicity, but also affects the structure and antigenicity of the other capsid protein. Implications of our data suggest that for the continued effectiveness of a vaccine, variation in both capsid proteins need to be considered and not just the protein the vaccine is directed against.
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Affiliation(s)
- Horng-Shen Chen
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA 17033, USA
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18
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McGarry TJ, Bonaguidi M, Lyass L, Kessler JA, Bodily JM, Doglio L. Enucleation of feeder cells and egg cells with psoralens. Dev Dyn 2010; 238:2614-21. [PMID: 19705441 DOI: 10.1002/dvdy.22080] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The cell nucleus must be inactivated or destroyed in order to generate feeder layers for cultured cells or to prepare recipient egg cells for nuclear transfer. Existing enucleation techniques are either cumbersome or employ toxic chemicals. Here we report a new method to enucleate cells by treatment with a psoralen and long-wave ultraviolet light. The technique is >90% efficient and causes little cytoplasmic damage to the treated cell. We have used psoralen treatment to enucleate a wide variety of cells, including eggs, sperm, HeLa cells, and fibroblasts. Colonies of human embryonic stem cells (hESCs) and human keratinocyte precursors grown on psoralen-treated feeders are indistinguishable from those grown on gamma-irradiated or mitomycin C-treated cells. Psoralen enucleation provides a rapid, simple, and non-toxic method to generate feeder cells. The technique is also useful for nuclear transfer studies in species with large eggs whose cleavage divisions are not regulated by cell-cycle checkpoints.
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Affiliation(s)
- Thomas J McGarry
- Feinberg Cardiovascular Research Institute, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA.
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19
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Abstract
Almost all current vaccines work by the induction of antibodies in serum or on the mucosa to block adherence of pathogens to epithelial cells or interfere with microbial invasion of the bloodstream. However, antibody levels usually decline after vaccination to undetectable amounts if further vaccination does not occur. Persistence of vaccine-induced antibodies usually goes well beyond the time when they should have decayed to undetectable levels because of ongoing "natural" boosting or other immunologic mechanisms. The production of memory B and T cells is of clear importance, but the likelihood that a memory response will be fast enough in the absence of a protective circulating antibody level likely depends on the pace of pathogenesis of a specific organism. This concept is discussed with regard to Haemophilus influenzae type b, Streptococcus pneumoniae, and Neisseria meningitidis; hepatitis A and B; diphtheria, tetanus, and pertussis; polio, measles, mumps, rubella, and varicella; rotavirus; and human papilloma virus. With infectious diseases for which the pace of pathogenesis is less rapid, some individuals will contract infection before the memory response is fully activated and implemented. With infectious diseases for which the pace of pathogenesis is slow, immune memory should be sufficient to prevent disease.
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Affiliation(s)
- Michael E Pichichero
- Rochester General Research Institute, Rochester General Hospital, Rochester, New York 14621, USA.
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20
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Song H, Moseley PL, Lowe SL, Ozbun MA. Inducible heat shock protein 70 enhances HPV31 viral genome replication and virion production during the differentiation-dependent life cycle in human keratinocytes. Virus Res 2009; 147:113-22. [PMID: 19896513 DOI: 10.1016/j.virusres.2009.10.019] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Revised: 10/22/2009] [Accepted: 10/22/2009] [Indexed: 01/31/2023]
Abstract
Increasing data indicate heat shock proteins (HSPs) including inducible HSP70 (HSP70i) are involved in the replicative cycles of various viruses including adenoviruses (Ads), polyomaviruses (PyVs), and some RNA viruses. Cell-free system studies implicate HSP70i in human papillomavirus type 11 (HPV11) genome replication with E1 and E2 proteins, and there is evidence that HSP70 is involved in capsid assembly and disassembly for PyVs and HPVs. HSP70 expression is increased in HPV16 E6/E7 gene transduced human primary keratinocytes, and frequently detected in early stage uterine cervical cancer at levels in conjunction with lesion severity. In this study we carry out analyses in the natural host epithelial tissues to assess the role of inducible HSP70 (HSP70i) in the HPV infectious life cycle. For these studies we used the organotypic (raft) culture system to recapitulate the full viral life cycle of the high-risk HPV31. Upon heat shock of HPV31-infected organotypic tissues, we find high and sustained expression of HSP70i coincident with enhanced HPV genome replication and virion production. Whereas there is no clear effect on L1 expression levels, we find HSP70i and L1 interact and HSP70i colocalizes with and enhances the nuclear localization of L1 in differentiated cells. Ad-mediated gene transfer was used to study the effects of HSP70i in naturally HPV-infected differentiating tissues and showed results similar to those in heat shocked rafts. These results indicate that increased HSP70i augments late activities in the viral life cycle. We conclude that HSP70i contributes directly to HPV replicative viral activities and the production of infectious virions.
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Affiliation(s)
- Hebin Song
- Department of Molecular Genetics and Microbiology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, USA
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21
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Wei L, Gravitt PE, Song H, Maldonado AM, Ozbun MA. Nitric oxide induces early viral transcription coincident with increased DNA damage and mutation rates in human papillomavirus-infected cells. Cancer Res 2009; 69:4878-84. [PMID: 19487298 DOI: 10.1158/0008-5472.can-08-4695] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
High-risk human papillomavirus (HPV) infections are necessary but insufficient causes of cervical cancers. Other risk factors for cervical cancer (e.g., pregnancy, smoking, infections causing inflammation) can lead to high and sustained nitric oxide (NO) concentrations in the cervix, and high NO levels are related to carcinogenesis through DNA damage and mutation. However, the effects of NO exposure in HPV-infected cells have not been investigated. In this study, we used the NO donor DETA-NO to model NO exposure to cervical epithelium. In cell culture media, 24-hour exposure to 0.25 to 0.5 mmol/L DETA-NO yielded a pathologically relevant NO concentration. Exposure of cells maintaining episomal high-risk HPV genomes to NO increased HPV early transcript levels 2- to 4-fold but did not increase viral DNA replication. Accompanying increased E6 and E7 mRNA levels were significant decreases in p53 and pRb protein levels, lower apoptotic indices, increased DNA double-strand breaks, and higher mutation frequencies when compared with HPV-negative cells. We propose that NO is a molecular cofactor with HPV infection in cervical carcinogenesis, and that modifying local NO cervical concentrations may constitute a strategy whereby HPV-related cancer can be reduced.
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Affiliation(s)
- Lanlan Wei
- Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, Albuquerque, New Mexico 87131, USA
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22
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Campos SK, Ozbun MA. Two highly conserved cysteine residues in HPV16 L2 form an intramolecular disulfide bond and are critical for infectivity in human keratinocytes. PLoS One 2009; 4:e4463. [PMID: 19214230 PMCID: PMC2636891 DOI: 10.1371/journal.pone.0004463] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Accepted: 01/06/2009] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Minor capsid protein L2 performs an indispensable but uncharacterized role in human papillomavirus infections. A neutralizing B cell epitope has recently been mapped to the N-terminus of HPV16 L2, residues 17-36, and exposure of this region of L2 has been implicated in translocation of incoming virions from the endo/lysosomal compartment to the cellular cytoplasm. Here we examine the redox state of Cys22 and Cys28 two highly conserved cysteines located within this epitope. We also investigate the infectivity of virions containing L2 single and double cysteine point mutants. METHODOLOGY AND PRINCIPAL FINDINGS Denaturing/non-reducing gel analysis and thiol labeling experiments of wild type and cysteine mutant HPV16 virion particles strongly support the existence of a buried intramolecular C22-C28 disulfide bond. The disulfide was confirmed by tandem mass spectrometry of L2 protein from non-reduced virions. Single C22S and C28S and the double C22/28S mutants were non-infectious but had no apparent defects in cell binding, endocytosis, or trafficking to lysosomes by 8 h post infection. During infection with L2 mutant particles, there was a marked decrease in L2 levels compared to wild type L2-containing virions, suggesting a failure of mutant L2/genome complexes to exit the endo/lysosomal compartment. CONCLUSIONS AND SIGNIFICANCE L2 residues C22 and C28 are bound as an intramolecular disulfide bond in HPV16 virions and are necessary for infectivity. Previous work has suggested that the furin-dependent exposure of the 17-36 epitope and subsequent interaction of this region with an unknown receptor is necessary for egress from the endo/lysosomal compartment and infection. Identification of the C22-C28 disulfide suggests that reduction of this disufide bond may be necessary for exposure of 17-36 and HPV16 infection.
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Affiliation(s)
- Samuel K. Campos
- The Department of Molecular Genetics and Microbiology, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America
| | - Michelle A. Ozbun
- The Department of Molecular Genetics and Microbiology, The University of New Mexico School of Medicine, Albuquerque, New Mexico, United States of America
- * E-mail:
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Abstract
A combination of functional studies on human papillomavirus (HPV) oncoproteins and epidemiological studies on persistence of HPV infection firmly established a role for HPV in the etiology of cervical cancers. Understanding the viral life cycle of HPVs has been more difficult. In this issue of Genes & Development, Wang et al. (pp. 181 - 194) describe an efficient method to propagate infectious HPV in differentiating epithelium, providing clear evidence for temporal separation of viral and cellular replication.
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Caveolin-1-dependent infectious entry of human papillomavirus type 31 in human keratinocytes proceeds to the endosomal pathway for pH-dependent uncoating. J Virol 2008; 82:9505-12. [PMID: 18667513 DOI: 10.1128/jvi.01014-08] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
High-risk human papillomaviruses (HPVs) are small nonenveloped DNA viruses with a strict tropism for squamous epithelium. The viruses are causative agents of cervical cancer and some head and neck cancers, but their differentiation-dependent life cycles have made them difficult to study in simple cell culture. Thus, many aspects of early HPV infection remain mysterious. We recently showed the high-risk HPV type 31 (HPV31) enters its natural host cell type via caveola-dependent endocytosis, a distinct mechanism from that of the closely related HPV16 (Smith et al., J. Virol. 81:9922-9931, 2007). Here, we determined the downstream trafficking events after caveolar entry of HPV31 into human keratinocytes. After initial plasma membrane binding, HPV31 associates with caveolin-1 and transiently localizes to the caveosome before trafficking to the early endosome and proceeding through the endosomal pathway. Caveosome-to-endosome transport was found to be Rab5 GTPase dependent. Although HPV31 capsids were observed in the lysosome, Rab7 GTPase was dispensable for HPV31 infection, suggesting that viral genomes escape from the endosomal pathway prior to Rab7-mediated capsid transport. Consistent with this, the acidic pH encountered by HPV31 within the early endosomal pathway induces a conformational change in the capsid resulting in increased DNase susceptibility of the viral genome, which likely aids in uncoating and/or endosomal escape. The entry and trafficking route of HPV31 into human keratinocytes represents a unique viral pathway by which the virions use caveolar entry to eventually access a low-pH site that appears to facilitate endosomal escape of genomes.
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Smith JL, Campos SK, Ozbun MA. Human papillomavirus type 31 uses a caveolin 1- and dynamin 2-mediated entry pathway for infection of human keratinocytes. J Virol 2007; 81:9922-31. [PMID: 17626097 PMCID: PMC2045393 DOI: 10.1128/jvi.00988-07] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Papillomaviruses are species-specific and epitheliotropic DNA viruses that cause tumors in their natural hosts. Certain infections with genital human papillomavirus (HPV) types are causally related to cervical cancer development. Most papillomaviruses are thought to infect cells via a clathrin-dependent pathway, yet no studies have determined the entry route in permissive host epithelial cells. Employing fluorescently labeled and native virions, we tested the effects of dominant-negative and biochemical inhibitors of cellular endocytosis pathways. Infections of human keratinocytes, a natural host cell type for HPVs, were assessed visually and by infectious entry assays. We found that HPV type 31 (HPV31) entry and initiation of early infection events require both caveolin 1 and dynamin 2 and occur independently of clathrin-mediated endocytosis. Treatment with chlorpromazine and filipin had opposing effects on HPV31 and HPV16 infection. HPV31 entry was remarkably slow, with a half-time of approximately 14 h, whereas the entry half-time of HPV16 was 4 h. Consistent with a caveola-mediated entry pathway for HPV31, the virions associated with detergent-resistant lipid rafts. During a 16-h microscopic tracking of HPV31 and HPV16 virions, no colocalization of the two viral types was observed. These data suggest that HPV31 and HPV16 virions use distinct routes for host epithelial cell entry.
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Affiliation(s)
- Jessica L Smith
- Department of Molecular Genetics and Microbiology, The University of New Mexico School of Medicine, Albuquerque, NM 87131, USA
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Hindmarsh PL, Laimins LA. Mechanisms regulating expression of the HPV 31 L1 and L2 capsid proteins and pseudovirion entry. Virol J 2007; 4:19. [PMID: 17324266 PMCID: PMC1808446 DOI: 10.1186/1743-422x-4-19] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Accepted: 02/26/2007] [Indexed: 11/10/2022] Open
Abstract
Human papillomaviruses (HPV) infect stratified epithelia and restrict expression of late capsid genes to highly differentiated cells. In order to begin to understand the processes regulating HPV 31 infection we examined the synthesis of the HPV 31 capsid proteins, L1 and L2, using heterologous expression systems. Similar to studies in HPV 16, expression of wild type HPV 31 L1 and L2 from heterologous promoters resulted in very low levels of synthesis. In contrast, modification of the codons in the capsid genes to ones more commonly used in cellular genes resulted in high-level synthesis. Through the use of chimeric proteins that fused fragments of wild type L1 to Green Fluorescent Protein (GFP) coding sequences, a short region was identified that was sufficient to inhibit high level synthesis and similar elements were detected in L2. One element was localized to the 3' end of the L1 gene while a series of elements were localized at the 3' end of the L2 coding sequences. These observations are most consistent with negative RNA regulatory elements controlling the levels of L1 and L2 synthesis that are distinct from those identified in HPV 16. Expression vectors for the codon modified HPV 31 capsid proteins were then transfected together with GFP reporter plasmids to generate HPV 31 pseudoviruses. Infection of cells with HPV 31 pseudoviruses in the presence of the inhibitors, chlorpromazine, nystatin or methyl-beta-cyclodextrin, demonstrated that HPV 31, like HPV 16, enters human and monkey cells through a clathrin-mediated pathway rather than through caveolae as previously reported. This suggests that high-risk HPV types may enter cells through common mechanisms.
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Affiliation(s)
- Patrick L Hindmarsh
- Department of Microbiology – Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, 60611, USA
- Louisiana State University Health Sciences Center, Department of Microbiology, Immunology and Parasitology 1901 Perdido St. New, Orleans, Louisiana 70112, USA
| | - Laimonis A Laimins
- Department of Microbiology – Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, 60611, USA
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Wu Y, Campos SK, Lopez GP, Ozbun MA, Sklar LA, Buranda T. The development of quantum dot calibration beads and quantitative multicolor bioassays in flow cytometry and microscopy. Anal Biochem 2007; 364:180-92. [PMID: 17397793 PMCID: PMC2018651 DOI: 10.1016/j.ab.2007.02.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2006] [Revised: 02/06/2007] [Accepted: 02/07/2007] [Indexed: 11/21/2022]
Abstract
The use of fluorescence calibration beads has been the hallmark of quantitative flow cytometry. It has enabled the direct comparison of interlaboratory data as well as quality control in clinical flow cytometry. In this article, we describe a simple method for producing color-generalizable calibration beads based on streptavidin functionalized quantum dots. Based on their broad absorption spectra and relatively narrow emission, which is tunable on the basis of dot size, quantum dot calibration beads can be made for any fluorophore that matches their emission color. In an earlier publication, we characterized the spectroscopic properties of commercial streptavidin functionalized dots (Invitrogen). Here we describe the molecular assembly of these dots on biotinylated beads. The law of mass action is used to readily define the site densities of the dots on the beads. The applicability of these beads is tested against the industry standard, namely commercial fluorescein calibration beads. The utility of the calibration beads is also extended to the characterization surface densities of dot-labeled epidermal growth factor ligands as well as quantitative indicators of the binding of dot-labeled virus particles to cells.
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Affiliation(s)
- Yang Wu
- Department of Pathology and Cancer Center, University of New Mexico, Albuquerque, NM 87131, USA
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28
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Angeletti PC. Replication and encapsidation of papillomaviruses in Saccharomyces cerevisiae. METHODS IN MOLECULAR MEDICINE 2006; 119:247-60. [PMID: 16353338 PMCID: PMC2080670 DOI: 10.1385/1-59259-982-6:247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Improvements in methodologies to recapitulate and study particular biological functions of the papillomavirus life cycle have led to great advances in our knowledge of these viruses. Described in this chapter are techniques that allow low-copy and high-copy replication of full-length human papillomavirus (HPV) genomes, as well as assembly of virus-like particles, in Saccharomyces cerevisiae (yeast). This system has several distinct advantages that make it an attractive complement to the well-established raft-culturing system. First, yeast are inexpensive, rapid, and simple to culture in the lab. Second, they provide an ever-widening array of genetic tools to analyze HPV functions--most recently notable, the yeast open reading frame (ORF)-deletion library. Third, yeast provide a potentially high-efficiency means to produce large quantities of infectious virus in a short time frame. Fourth, assembly of HPV virus in yeast allows encapsidation of mutant genomes, since previous studies have shown that no viral ORF is required for replication of full-length HPV in yeast.
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Affiliation(s)
- Peter C Angeletti
- Nebraska Center for Virology, School of Biological Sciences, University of Nebraska-Lincoln, USA
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29
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Pyeon D, Lambert PF, Ahlquist P. Production of infectious human papillomavirus independently of viral replication and epithelial cell differentiation. Proc Natl Acad Sci U S A 2005; 102:9311-6. [PMID: 15958530 PMCID: PMC1166641 DOI: 10.1073/pnas.0504020102] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Papillomaviruses are small DNA viruses that are associated with benign and malignant epithelial lesions, including >95% of cervical cancers and approximately 20% of head and neck cancers. Because papillomavirus replication and virion production are tied to epithelial cell differentiation, infectious papillomavirus virion production has been limited to cumbersome organotypic cultures and mouse xenografts. Consequent difficulties in obtaining useful amounts of wild-type or mutant human papillomavirus (HPV) virions have greatly limited studies on many aspects of papillomavirus biology. To overcome these limitations, we developed a system to encapsidate the full-length papillomaviral genome into infectious virions, independently of viral DNA replication and epithelial differentiation. This transient-transfection-based system produces >1,000 times more infectious virus per cell culture dish than the much more labor-intensive organotypic culture. Furthermore, we show that this method allows the facile generation of infectious particles containing wild-type, mutant, or chimeric papillomaviral genomes, overcoming barriers to studying many facets of replication, host interactions, and vaccine and drug development, which has been limited by the insufficient availability of infectious virions.
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Affiliation(s)
- Dohun Pyeon
- McArdle Laboratory for Cancer Research, Institute for Molecular Virology, University of Wisconsin, Madison, WI 53706, USA
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Patterson NA, Smith JL, Ozbun MA. Human papillomavirus type 31b infection of human keratinocytes does not require heparan sulfate. J Virol 2005; 79:6838-47. [PMID: 15890923 PMCID: PMC1112118 DOI: 10.1128/jvi.79.11.6838-6847.2005] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Oncogenic human papillomaviruses (HPVs) are difficult to study experimentally as they replicate at low levels in vivo. This has precluded the purification of high-risk HPV virions from in vivo lesions. Virus-like particles (VLPs) and pseudovirions from low- and high-risk HPV types can emulate various aspects of HPV virion attachment and infections. These studies suggest that HPV infection is mediated by alpha6-integrin and/or heparan-sulfonated receptors. However, whether VLPs and pseudovirions accurately reflect the infection process of HPV virions has not been verified. We generated infectious HPV31b virions from organotypic (raft) tissues and performed experimental infections in a variety of cells. Successful infection following viral attachment, internalization, and nuclear transport was assayed by detecting newly synthesized, spliced HPV transcripts using reverse transcription (RT)-PCR or RT-quantitative PCR. Most human epithelial cells were infected with HPV31b at a multiplicity of infection as low as 1 to 10 viral genome equivalents per cell. HPV31b infection was detected in other cell lines, including COS-7 monkey kidney cells, but higher viral multiplicities of infection were required. Heparin preparations of various molecular weights or heparinase I treatment of cells prevented HPV31b infection of COS-7 cells and C-33A human cervical cancer cells in reproducible and dose-dependent manners. However, these reagents were unable to block infection of human keratinocytes, including HaCaT and N/TERT-1 cells and low-passage human foreskin keratinocytes. These data suggest that HPV31b infection of human keratinocytes, the natural host cell for HPV infections in vivo, does not require a heparan-sulfonated receptor, whereas heparan sulfate is important for infection of some other cells.
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Affiliation(s)
- Nicole A Patterson
- Department of Molecular Genetics and Microbiology, University of New Mexico School of Medicine, Albuquerque, New Mexico 87131, USA
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Holmgren SC, Patterson NA, Ozbun MA, Lambert PF. The minor capsid protein L2 contributes to two steps in the human papillomavirus type 31 life cycle. J Virol 2005; 79:3938-48. [PMID: 15767396 PMCID: PMC1061585 DOI: 10.1128/jvi.79.7.3938-3948.2005] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Prior studies, which have relied upon the use of pseudovirions generated in heterologous cell types, have led to sometimes conflicting conclusions regarding the role of the minor capsid protein of papillomaviruses, L2, in the viral life cycle. In this study we carry out analyses with true virus particles assembled in the natural host cell to assess L2's role in the viral infectious life cycle. For these studies we used the organotypic (raft) culture system to recapitulate the full viral life cycle of the high-risk human papillomavirus HPV31, which was either wild type or mutant for L2. After transfection, the L2 mutant HPV31 genome was able to establish itself as a nuclear plasmid in proliferating populations of poorly differentiated (basal-like) human keratinocytes and to amplify its genome to high copy number, support late viral gene expression, and cause formation of virus particles in human keratinocytes that had been induced to undergo terminal differentiation. These results indicate that aspects of both the nonproductive and productive phases of the viral life cycle occur normally in the absence of functional L2. However, upon the analysis of the virus particles generated, we found an approximate 10-fold reduction in the amount of viral DNA encapsidated into L2-deficient virions. Furthermore, there was an over-100-fold reduction in the infectivity of L2-deficient virus. Because the latter deficiency cannot be accounted for solely by the 10-fold decrease in encapsidation, we conclude that L2 contributes to at least two steps in the production of infectious virus.
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Affiliation(s)
- Sigrid C Holmgren
- McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, 1400 University Ave., Madison, WI 53706, USA
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Brinkman JA, Rahmani MZ, Jones WE, Chaturvedi AK, Hagensee ME. Optimization of PCR based detection of human papillomavirus DNA from urine specimens. J Clin Virol 2004; 29:230-40. [PMID: 15018850 DOI: 10.1016/s1386-6532(03)00157-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2003] [Revised: 06/12/2003] [Accepted: 06/13/2003] [Indexed: 11/25/2022]
Abstract
BACKGROUND Human papillomavirus (HPV) causes cervical cancer. Current screening requires a yearly pelvic exam and Pap smear. However, these procedures are impractical for screening all women at risk for disease. Urine sampling has been successfully utilized to screen for Chlamydia trachomatis (CT) and Neisseria gonorrhoreae (NG) infections and has been considered for HPV DNA detection by several investigators. However, no study to date has been performed to specifically optimize HPV detection in urine. OBJECTIVES To compare handling and extraction techniques in order to optimize the HPV specific PCR system in urine specimens. STUDY DESIGN Examination of 10 characteristics that may contribute to PCR inhibition in urine was performed utilizing 10SG mulitstixs. Five different DNA extraction methods were compared in spiked specimens and in 10 clinical specimens. After the optimal extraction technique was identified, concentration of the sample with and without prior dilution was compared to the original protocol. Lastly, specimen handling was compared between immediate processing, refrigerating overnight, or freezing overnight. RESULTS AND CONCLUSIONS the presence of protein in urine enhanced amplification while nitrites decreased amplification. Of the extraction methods tested, the QIAamp DNA Mini Kit demonstrated the best amplification from urine samples spiked with HPV DNA and clinical specimens. The addition of a dilution step and a concentration step before applying the Qiagen protocol further increased amplification of beta-globin (from 50 to 63%) and the HPV L1 gene (from 13 to 33%). Lastly, refrigerating the specimens at 4 degrees C overnight appears to produce better amplification (62% beta-globin and 17% HPV positive) than either immediate processing (46% beta-globin and 13% HPV+) or freezing the specimen for 24h prior to processing (46% beta-globin and 10% HPV+). In these studies, amplification was low despite optimization. Additional improvements are required prior to clinical application of a urine-based HPV DNA detection system.
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Affiliation(s)
- Joeli A Brinkman
- Department of Microbiology, LSU Health Sciences Center, New Orleans, LA, USA
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Lee JH, Yi SMP, Anderson ME, Berger KL, Welsh MJ, Klingelhutz AJ, Ozbun MA. Propagation of infectious human papillomavirus type 16 by using an adenovirus and Cre/LoxP mechanism. Proc Natl Acad Sci U S A 2004; 101:2094-9. [PMID: 14769917 PMCID: PMC357057 DOI: 10.1073/pnas.0308615100] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Human papillomavirus type 16 (HPV16) infection is a major risk factor for the development of squamous cell cancers of the cervix and of the head and neck. A major barrier to understanding the progression from initial infection to cancer has been the lack of in vitro models that allow infection, replication, and persistence of the viral genome as an episome in differentiated epithelial cells. To overcome this barrier, we designed an adenoviral delivery vector that contained a full HPV16 genome flanked by LoxP homologous recombination sites and a fluorescent reporter that was expressed only after the HPV genome was excised by Cre recombinase. This system delivered circular HPV16 genomes to cervical epithelial cells and well differentiated human airway epithelia. After delivery, the HPV16 genome replicated and persisted as an episome in cervical keratinocytes. These cells developed an immortalized phenotype and a dysplastic epithelial appearance. Moreover, induction of differentiation led to the expression of late genes and production of infectious HPV16 virions. This work provides a means of introducing biologically active HPV genomes into epithelial cells, which are normally difficult to transfect. These methods allow the study of HPV genome replication and gene expression in the earliest stages of HPV genome establishment, and they may provide a means to study nononcogenic HPV viral types.
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Affiliation(s)
- John H Lee
- Department of Otolaryngology, Head and Neck Surgery, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.
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Culp TD, Christensen ND. Kinetics of in vitro adsorption and entry of papillomavirus virions. Virology 2004; 319:152-61. [PMID: 14967496 DOI: 10.1016/j.virol.2003.11.004] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2003] [Revised: 11/04/2003] [Accepted: 11/07/2003] [Indexed: 11/18/2022]
Abstract
There has been much incongruence in reports addressing the rate at which papillomaviruses enter cultured cells. We used a recently developed QRT-PCR assay (J. Virol. Methods 111 (2003) 135) to analyze the expression, adsorption, and entry kinetics of human papillomavirus type 11 (HPV-11) in multiple cell lines. Parallel experiments with HPV-40 and cottontail rabbit papillomavirus (CRPV) were also performed with biologically relevant lines. Infection was determined by the expression of early transcripts containing the E1 E4 splice junction. Results support previous observations that papillomaviruses may enter cultured cells much more slowly than rates reported for similarly structured viruses (Virology 207 (1995) 136; Virology 307 (2003) 1; J. Virol. 75 (2001) 1565). Additionally, our data suggest that, following adsorption to the cell surface, capsomeric structure remains largely unchanged for many hours as HPV-11 virions remain equally susceptible to neutralization by a nonspecific microbicide and by L1-specific monoclonal antibodies (MAb) targeting both linear and conformationally sensitive epitopes.
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Affiliation(s)
- Timothy D Culp
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033-2390, USA
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Lehr EE, Qadadri B, Brown CR, Brown DR. Human papillomavirus type 59 immortalized keratinocytes express late viral proteins and infectious virus after calcium stimulation. Virology 2003; 314:562-71. [PMID: 14554084 DOI: 10.1016/s0042-6822(03)00492-6] [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: 11/21/2022]
Abstract
Human papillomavirus type 59 (HPV 59) is an oncogenic type related to HPV 18. HPV 59 was recently propagated in the athymic mouse xenograft system. A continuous keratinocyte cell line infected with HPV 59 was created from a foreskin xenograft grown in an athymic mouse. Cells were cultured beyond passage 50. The cells were highly pleomorphic, containing numerous abnormally shaped nuclei and mitotic figures. HPV 59 sequences were detected in the cells by DNA in situ hybridization in a diffuse nuclear distribution. Southern blots were consistent with an episomal state of HPV 59 DNA at approximately 50 copies per cell. Analysis of the cells using a PCR/reverse blot strip assay, which amplifies a portion of the L1 open reading frame, was strongly positive. Differentiation of cells in monolayers was induced by growth in F medium containing 2 mM calcium chloride for 10 days. Cells were harvested as a single tissue-like sheet, and histologic analysis revealed a four-to-six cell-thick layer. Transcripts encoding involucrin, a cornified envelope protein, and the E1/E4 and E1/E4/L1 viral transcripts were detected after several days of growth in F medium containing 2 mM calcium chloride. The E1/E4 and L1 proteins were detected by immunohistochemical analysis, and virus particles were seen in electron micrographs in a subset of differentiated cells. An extract of differentiated cells was prepared by vigorous sonication and was used to infect foreskin fragments. These fragments were implanted into athymic mice. HPV 59 was detected in the foreskin xenografts removed 4 months later by DNA in situ hybridization and PCR/reverse blot assay. Thus, the complete viral growth cycle, including production on infectious virus, was demonstrated in the HPV 59 immortalized cells grown in a simple culture system.
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Affiliation(s)
- Elizabeth E Lehr
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
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You H, Liu Y, Agrawal N, Prasad CK, Chiriva-Internati M, Lowery CL, Kay HH, Hermonat PL. Infection, replication, and cytopathology of human papillomavirus type 31 in trophoblasts. Virology 2003; 316:281-9. [PMID: 14644610 DOI: 10.1016/j.virol.2003.08.020] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Human papillomavirus (HPV) DNA is preferentially found in spontaneous abortions, specifically residing in trophoblasts, and transfected HPV-16 DNA replicates and produces progeny in 3A trophoblasts in culture. In this study 3A trophoblasts were shown to display both HPV receptors and infection by HPV-31b and HPV-6 virus resulted in de novo (increasing) HPV DNA replication in these cells (inhibited by neutralizing anti-HPV31b antibodies). Reverse transcription-polymerase chain reaction analysis revealed that E1;E4, E6, and L1 were significantly expressed at days 5 (early) and 10 (late), respectively, and in situ immunocytochemistry verified L1 protein expression. Perhaps most important, HPV 31b virus infection caused both a decrease in 3A trophoblast cell numbers in a dose-dependent manner and a low trophoblast-endometrial cell adhesion (both inhibited by neutralizing anti-HPV-31 antibodies). These data further support the hypothesis that HPVs are fully active in trophoblasts and may cause some spontaneous abortions.
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Affiliation(s)
- Hong You
- Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, 4301 West Markham St, Little Rock, AR 72205, USA
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Abstract
Early events in the life cycle of the human papillomaviruses (HPV) have been difficult to investigate due to both the scarcity of authentic HPV virions and limitations in assays to detect and quantify nonpermissive infections in monolayer cell culture. We have developed a quantitative reverse transcription-PCR (QRT-PCR) assay for the E1( wedge )E4 transcript of HPV-11. This assay is both sensitive, and capable of differentiating between infections caused by a wide range of virus input. The QRT-PCR assay measured accurately the relative amount of viral transcripts present in samples during validation experiments using RNAs from three cell lines. Infections in all three cell lines, using titrations of HPV-11 virions ranging from 20 to 600 particles per cell, produced linear expression profiles suggesting that these multiplicities of infection are below the saturation level for viral uptake and transcription. Comparison of the QRT-PCR assay with the commonly used nested RT-PCR assay revealed that although the nested RT-PCR assay was more sensitive, it did not differentiate between infections caused by >1000-fold difference in viral inputs. Potential applications of the QRT-PCR assay are demonstrated in experiments measuring the ability of a capsid-specific monoclonal antibody and a nonspecific microbicide to block HPV-11 infection.
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Affiliation(s)
- Timothy D Culp
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
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Ozbun MA. Human papillomavirus type 31b infection of human keratinocytes and the onset of early transcription. J Virol 2002; 76:11291-300. [PMID: 12388689 PMCID: PMC136784 DOI: 10.1128/jvi.76.22.11291-11300.2002] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2002] [Accepted: 08/12/2002] [Indexed: 11/20/2022] Open
Abstract
Human papillomaviruses (HPVs) cause a number of human tumors and malignancies, including cervical cancers. Epithelial differentiation is required for the complete HPV life cycle and can be achieved using the organotypic (raft) culture system. The CIN-612 9E cell line maintains episomal copies of HPV type 31b (HPV31b), an HPV type associated with cervical cancers. When grown in the raft system, CIN-612 9E cells form a differentiated epithelium such that infectious virions can be synthesized. Many aspects of the later stages of the HPV31b life cycle have been investigated in CIN-612 9E raft tissues. We used a biologically contained homogenization system for efficient virion extraction from raft epithelial tissues. Purified HPV31b virions were used to infect low-passage-number human foreskin keratinocytes and a variety of epithelial cell lines. Newly synthesized, spliced HPV31b transcripts were detected by reverse transcription and PCR (RT-PCR) following HPV31b infection. HPV31b infection was most efficient and reproducible in HaCaT cells. The onset of viral transcription following infection was also investigated using RT-PCR techniques. Spliced E1(*)I,E2 RNAs were present as early as 4 h postinfection (p.i.), whereas the other major viral transcripts were detected by 8 to 10 h p.i. Furthermore, we characterized the structures and temporal expression of seven novel spliced early transcripts expressed following infection.
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Affiliation(s)
- Michelle A Ozbun
- Department of Molecular Genetics and Microbiology, The University of New Mexico School of Medicine, Albuquerque, New Mexico 87131, USA.
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