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Ogłuszka M, Starzyński RR, Pierzchała M, Otrocka-Domagała I, Raś A. Equine Sarcoids-Causes, Molecular Changes, and Clinicopathologic Features: A Review. Vet Pathol 2021; 58:472-482. [PMID: 33461443 DOI: 10.1177/0300985820985114] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Equine sarcoid is the most common skin tumor of horses. Clinically, it occurs as a locally invasive, fibroblastic, wart-like lesion of equine skin, which has 6 clinical classes: occult, verrucose, nodular, fibroblastic, mixed, and malignant. Sarcoids may be single but multiple lesions are more frequent. The typical histological feature is increased density of dermal fibroblasts which form interlacing bundles and whorls within the dermis. Lesions are mostly persistent, resist therapy, and tend to recur following treatment. In general, sarcoids are not fatal but their location, size, and progression to the more aggressive form may lead to the withdrawal of a horse from use and serious infringement of their welfare leading to the loss of valuable animals. Bovine papillomavirus (BPV) type 1 and less commonly type 2 contribute to the development of equine sarcoid. The viral genome and proteins are detected in a high percentage of cases. Furthermore, viral oncoprotein activity leads to changes in the fibroblastic tissue similar to changes seen in other types of tumors. Equine sarcoids are characterized by a loss of tumor suppressor activity and changes allowing abnormal formation of the affected tissue, as well as y immune defense abnormalities that weaken the host's immune response. This impaired immune response to BPV infection appears to be crucial for the development of lesions that do not spontaneously regress, as occurs in BPV-infected cows.
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Affiliation(s)
- Magdalena Ogłuszka
- Institute of Genetics and Animal Biotechnology of the 49559Polish Academy of Sciences, Jastrzębiec, Poland
| | - Rafał Radosław Starzyński
- Institute of Genetics and Animal Biotechnology of the 49559Polish Academy of Sciences, Jastrzębiec, Poland
| | - Mariusz Pierzchała
- Institute of Genetics and Animal Biotechnology of the 49559Polish Academy of Sciences, Jastrzębiec, Poland
| | | | - Andrzej Raś
- 49674University of Warmia and Mazury, Olsztyn, Poland
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2
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Semik-Gurgul E. Molecular approaches to equine sarcoids. Equine Vet J 2020; 53:221-230. [PMID: 32654178 DOI: 10.1111/evj.13322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 06/09/2020] [Accepted: 07/02/2020] [Indexed: 11/29/2022]
Abstract
Sarcoids are the most commonly diagnosed skin tumours in equines. Bovine papillomaviruses (BPVs) are the primary causative agent of sarcoids. There has been intensive research to discover the molecular mechanisms that may contribute to the aetiopathogenesis of this disease and tumour suppressors and proto-oncogenes known to play a role in human neoplastic conditions have been investigated in equine sarcoids. Current approaches include the identification of gene expression profiles, characterising sarcoid and normal skin tissues, and an assessment of epigenetic alterations such as microRNA differential expression and DNA methylation status. This review focuses on selected groups of genes that contribute to the molecular mechanisms of sarcoid formation. These genes have the potential to complement current clinical examinations of equine sarcoid disease in diagnosis, prognosis, therapeutic response and screening.
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Affiliation(s)
- Ewelina Semik-Gurgul
- Department of Animal Molecular Biology, National Research Institute of Animal Production, Balice, Poland
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3
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Bovine Papillomavirus 1 Gets Out of the Flock: Detection in an Ovine Wart in Sicily. Pathogens 2020; 9:pathogens9060429. [PMID: 32486181 PMCID: PMC7350338 DOI: 10.3390/pathogens9060429] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 05/27/2020] [Accepted: 05/28/2020] [Indexed: 02/06/2023] Open
Abstract
A proliferative cauliflower lesion was excised from the udder of a sheep. Histological investigation confirmed the macroscopic classification of the lesion as a papilloma, without any fibroblastic proliferation. PCR revealed the presence of bovine papillomavirus (BPV), which was further confirmed by the identification of a Deltapapillomavirus4 by Next Generation Sequencing analysis. This was subsequently classified as bovine papillomavirus type 1. Negative staining electron microscopy (EM) analyses produced negative test results for papillomavirus particles. RNA in situ hybridization (ISH) confirmed the presence of BPV-1. The results further confirm the ability of BPVs belonging to the Deltapapillomavirus genus to infect distantly related species and to cause lesions that are different from sarcoids.
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4
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Prophylactic Vaccination Against Papillomavirus-Induced Tumour Disease. Comp Med 2017. [DOI: 10.1007/978-3-319-47007-8_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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5
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Abel-Reichwald H, Hainisch EK, Zahalka S, Corteggio A, Borzacchiello G, Massa B, Merlone L, Nasir L, Burden F, Brandt S. Epidemiologic analysis of a sarcoid outbreak involving 12 of 111 donkeys in Northern Italy. Vet Microbiol 2016; 196:85-92. [DOI: 10.1016/j.vetmic.2016.10.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 10/14/2016] [Accepted: 10/15/2016] [Indexed: 01/05/2023]
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6
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Terron-Canedo N, Weir W, Nicolson L, Britton C, Nasir L. Differential expression of microRNAs in bovine papillomavirus type 1 transformed equine cells. Vet Comp Oncol 2016; 15:764-774. [DOI: 10.1111/vco.12216] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 12/23/2015] [Accepted: 12/30/2015] [Indexed: 12/20/2022]
Affiliation(s)
- N. Terron-Canedo
- MRC - University of Glasgow Centre for Virus Research, Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences; University of Glasgow; Glasgow UK
| | - W. Weir
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences; University of Glasgow; Glasgow UK
| | - L. Nicolson
- School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences; University of Glasgow; Glasgow UK
| | - C. Britton
- Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences; University of Glasgow; Glasgow UK
| | - L. Nasir
- School of Veterinary Medicine, College of Medical, Veterinary and Life Sciences; University of Glasgow; Glasgow UK
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7
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Bauer BS. Ocular Pathology. Vet Clin North Am Equine Pract 2015. [PMID: 26210955 DOI: 10.1016/j.cveq.2015.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Although not comprehensive of all ocular conditions in the equine species, this article concentrates on various ophthalmic conditions observed in the horse where laboratory diagnostics are recommended. The importance of laboratory diagnostic testing cannot be underestimated with equine ophthalmic disease. In many cases, laboratory diagnostics can aid in obtaining an early diagnosis and determining appropriate therapy, which in turn, can provide a better prognosis. In unfortunate cases where ocular disease results in a blind, painful eye necessitating enucleation, light microscopic evaluation is imperative to determine or confirm the cause of the blindness and provide a prognosis for the contralateral eye.
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Affiliation(s)
- Bianca S Bauer
- Small Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan S7N 5B4, Canada.
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8
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Gaynor AM, Zhu KW, Dela Cruz FN, Affolter VK, Pesavento PA. Localization of Bovine Papillomavirus Nucleic Acid in Equine Sarcoids. Vet Pathol 2015. [PMID: 26215759 DOI: 10.1177/0300985815594852] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Bovine papillomaviruses (BPV1/BPV2) have long been associated with equine sarcoids; deciphering their contribution has been difficult due to their ubiquitous presence on skin and in the environment, as well as the lack of decent techniques to interrogate their role in pathogenesis. We have developed and characterized an in situ hybridization (ISH) assay that uses a pool of probes complementary to portions of the E5, E6, and E7 genes. This assay is highly sensitive for direct visualization of viral transcript and nucleic acid in routinely processed histopathologic samples. We demonstrate here the visualization of BPV nucleic acid in 18 of 18 equine sarcoids, whereas no detectable viral DNA was present in 15 of 15 nonsarcoid controls by this technique. In nearly 90% (16/18) of the sarcoids, 50% or more of the fibroblastic cell nuclei distributed throughout the neoplasm had detectable hybridization. In the remaining 2 cases, fewer than half of the fibroblastic cells contained detectable hybridization, but viral nucleic acid was also detected in epithelial cells of the sebaceous glands, hair follicles and epidermis. A sensitive ISH assay is an indispensable addition to the molecular methods used to detect viral nucleic acid in tissue. We have used this technique to determine the specific cellular localization and distribution of BPV in a subset of equine sarcoids.
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Affiliation(s)
- A M Gaynor
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - K W Zhu
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - F N Dela Cruz
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - V K Affolter
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - P A Pesavento
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
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9
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Gaynor AM, Fish S, Duerr RS, Cruz FND, Pesavento PA. Identification of a novel papillomavirus in a Northern Fulmar (Fulmarus glacialis) with viral production in cartilage. Vet Pathol 2014; 52:553-61. [PMID: 25034110 DOI: 10.1177/0300985814542812] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We report the identification of a novel papillomavirus, Fulmarus glacialis papillomavirus 1 (FgPV1), present within an interdigital foot mass of a Northern Fulmar (Fulmarus glacialis). The mass of interest was composed of normal stratified and keratinized epithelium and dense mesenchymal cells with central cartilaginous islands. Within the nuclei of many chondrocytes were loose aggregates or paracrystalline arrays of virions approximately 50 nm in size. Degenerate polymerase chain reaction was used to identify the virus as a putative papillomavirus, and the entire viral genome of 8132 base pairs was subsequently amplified and sequenced. Analysis revealed canonical papillomavirus architecture, including the early open reading frames E6, E7, E1, and E2 and the 2 late proteins L1 and L2. FgPV1 is most closely related to a cluster of avian and reptilian papillomaviruses as visualized by phylogenetic trees. This observation suggests that papillomavirus virion production can occur in mesenchymal cells.
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Affiliation(s)
- A M Gaynor
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - S Fish
- California Animal Health and Food Safety Laboratory, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - R S Duerr
- International Bird Rescue, San Francisco Bay Center, Fairfield, CA, USA
| | - F N Dela Cruz
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - P A Pesavento
- Department of Pathology, Microbiology, Immunology, School of Veterinary Medicine, University of California, Davis, CA, USA
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10
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Abstract
Fifty years ago, inoculation with bovine papillomavirus (BPV) was found to cause mesenchymal tumors of the skin in cattle and horses, as well as tumors of the bladder in cattle. Subsequent to these studies of BPVs, human papillomaviruses (HPVs) were found to cause cervical cancer resulting in intense research into papillomaviruses. During the past 50 years, the ways that HPVs and BPVs cause disease have been investigated, and both HPVs and BPVs have been associated with an increasingly diverse range of diseases. Herein, the biology, oncogenic mechanisms, and diseases associated with BPVs are compared with those of HPVs. As reviewed, there are currently significant differences between BPVs and HPVs. However, research 50 years ago into BPVs formed a prologue for the recognition that papillomaviruses have a significant role in human disease, and it is possible that future research may similarly reveal that BPVs are less different from HPVs than is currently recognized.
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Affiliation(s)
- J. S. Munday
- Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
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11
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Taylor SD, Toth B, Baseler LJ, Charney VA, Miller MA. Lack of Correlation Between Papillomaviral DNA in Surgical Margins and Recurrence of Equine Sarcoids. J Equine Vet Sci 2014. [DOI: 10.1016/j.jevs.2013.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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12
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Papillomavirus associated diseases of the horse. Vet Microbiol 2013; 167:159-67. [DOI: 10.1016/j.vetmic.2013.08.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 07/04/2013] [Accepted: 08/05/2013] [Indexed: 12/30/2022]
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13
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Hainisch EK, Brandt S, Shafti-Keramat S, Van den Hoven R, Kirnbauer R. Safety and immunogenicity of BPV-1 L1 virus-like particles in a dose-escalation vaccination trial in horses. Equine Vet J 2011; 44:107-11. [PMID: 21895749 DOI: 10.1111/j.2042-3306.2011.00390.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
REASONS FOR PERFORMING STUDY Infection with bovine papillomaviruses types 1 and 2 (BPV-1, BPV-2) can lead to the development of therapy-resistant skin tumours termed sarcoids and possibly other skin diseases in equids. Although sarcoids seriously compromise the welfare of affected animals and cause considerable economic losses, no prophylactic vaccine is available to prevent this common disease. In several animal species and man, immunisation with papillomavirus-like particles (VLP) has been shown to protect efficiently from papillomaviral infection. HYPOTHESIS BPV-1 L1 VLPs may constitute a safe and highly immunogenic vaccine candidate for protection of horses against BPV-1/-2-induced disease. METHODS Three groups of 4 horses each received 50, 100 or 150 µg of BPV-1 L1 VLPs, respectively, on Days 0, 28 and 168. Three control horses received adjuvant only. Horses were monitored on a daily basis for one week after each immunisation and then in 2 week intervals. Sera were collected immediately before, 2 weeks after each vaccination and one and 2 years after the final boost and analysed by pseudovirion neutralisation assay. RESULTS None of the horses showed adverse reactions upon vaccination apart from mild and transient swelling in 2 individuals. Irrespective of the VLP dose, all VLP-immunised horses had developed a BPV-1-neutralising antibody titre of ≥ 1600 plaque forming units (pfu)/ml 2 weeks after the third vaccination. Eight of 10 trial horses still available for follow-up had neutralising antibody titres ≥ 1600 pfu/ml one year and ≥ 800 pfu/ml 2 years after the last immunisation. CONCLUSION Intramuscular BPV-1 L1 VLP vaccination in horses is safe and results in a long-lasting antibody response against BPV-1. Neutralisation titres were induced at levels that correlate with protection in experimental animals and man. POTENTIAL RELEVANCE BPV-1 L1 VLPs constitute a promising vaccine candidate for prevention of BPV-1/-2-induced disease in equids.
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Affiliation(s)
- E K Hainisch
- Large Animal Surgery and Orthopaedics, Equine Clinic, University of Veterinary Medicine, Vienna, Austria
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14
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Hartl B, Hainisch EK, Shafti-Keramat S, Kirnbauer R, Corteggio A, Borzacchiello G, Tober R, Kainzbauer C, Pratscher B, Brandt S. Inoculation of young horses with bovine papillomavirus type 1 virions leads to early infection of PBMCs prior to pseudo-sarcoid formation. J Gen Virol 2011; 92:2437-2445. [PMID: 21715602 DOI: 10.1099/vir.0.033670-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Bovine papillomavirus types 1 and 2 (BPV-1 and BPV-2) are known to induce common equine skin tumours, termed sarcoids. Recently, it was demonstrated that vaccination with BPV-1 virus-like particles (VLPs) is safe and highly immunogenic in horses. To establish a BPV-1 challenge model for evaluation of the protective potential of BPV-1 VLPs, four foals were injected intradermally with infectious BPV-1 virions and with viral genome-based and control inocula, and monitored daily for tumour development. Blood was taken before inoculation and at weekly intervals. BPV-1-specific serum antibodies were detected by a pseudo-virion neutralization assay. Total nucleic acids extracted from tumours, intact skin and PBMCs were tested for the presence of BPV-1 DNA and mRNA using PCR and RT-PCR, respectively. Intralesional E5 oncoprotein expression was determined by immunofluorescence. Pseudo-sarcoids developed exclusively at sites inoculated with virions. Tumours became palpable 11-32 days after virion challenge, reached a size of ≤20 mm in diameter and then resolved in ≤6 months. No neutralizing anti-BPV-1 serum antibodies were detectable pre- or post-challenge. BPV-1 DNA was present in lesions but not in intact skin. In PBMCs, viral DNA was already detectable before lesions were first palpable, in concentrations correlating directly with tumour growth kinetics. PBMCs from two of two foals also harboured E5 mRNA. Immunofluorescence revealed the presence of the E5 protein in tumour fibroblasts, but not in the apparently normal epidermis overlying the lesions. Together with previous findings obtained in horses and cows, these data suggest that papillomavirus infection may include a viraemic phase.
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Affiliation(s)
- Bettina Hartl
- Division of Large Animal Surgery and Orthopaedics, Equine Clinic, Veterinary University Vienna, Vienna, Austria.,Division of Large Animal Internal Medicine, Equine Clinic, Veterinary University Vienna, Vienna, Austria
| | - Edmund K Hainisch
- Division of Large Animal Surgery and Orthopaedics, Equine Clinic, Veterinary University Vienna, Vienna, Austria
| | - Saeed Shafti-Keramat
- Laboratory of Viral Oncology, Division of Immunology, Allergy and Infectious Disease, Department of Dermatology, Medical University Vienna, Vienna, Austria
| | - Reinhard Kirnbauer
- Laboratory of Viral Oncology, Division of Immunology, Allergy and Infectious Disease, Department of Dermatology, Medical University Vienna, Vienna, Austria
| | - Annunziata Corteggio
- Department of Pathology and Animal Health, Faculty of Veterinary Medicine, University of Naples Federico II, Naples, Italy
| | - Giuseppe Borzacchiello
- Department of Pathology and Animal Health, Faculty of Veterinary Medicine, University of Naples Federico II, Naples, Italy
| | - Reinhard Tober
- Department of Hygiene, Microbiology and Social Medicine, Division of Virology, Medical University Innsbruck, Innsbruck, Austria
| | - Christina Kainzbauer
- Division of Large Animal Surgery and Orthopaedics, Equine Clinic, Veterinary University Vienna, Vienna, Austria.,Division of Large Animal Internal Medicine, Equine Clinic, Veterinary University Vienna, Vienna, Austria
| | - Barbara Pratscher
- Division of Large Animal Surgery and Orthopaedics, Equine Clinic, Veterinary University Vienna, Vienna, Austria.,Division of Large Animal Internal Medicine, Equine Clinic, Veterinary University Vienna, Vienna, Austria
| | - Sabine Brandt
- Division of Large Animal Surgery and Orthopaedics, Equine Clinic, Veterinary University Vienna, Vienna, Austria.,Division of Large Animal Internal Medicine, Equine Clinic, Veterinary University Vienna, Vienna, Austria
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Brandt S, Tober R, Corteggio A, Burger S, Sabitzer S, Walter I, Kainzbauer C, Steinborn R, Nasir L, Borzacchiello G. BPV-1 infection is not confined to the dermis but also involves the epidermis of equine sarcoids. Vet Microbiol 2011; 150:35-40. [DOI: 10.1016/j.vetmic.2010.12.021] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 12/07/2010] [Accepted: 12/14/2010] [Indexed: 10/18/2022]
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16
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BRANDT S, SCHOSTER A, TOBER R, KAINZBAUER C, BURGSTALLER JP, HARALAMBUS R, STEINBORN R, HINTERHOFER C, STANEK C. Consistent detection of bovine papillomavirus in lesions, intact skin and peripheral blood mononuclear cells of horses affected by hoof canker. Equine Vet J 2011; 43:202-9. [DOI: 10.1111/j.2042-3306.2010.00147.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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HARALAMBUS R, BURGSTALLER J, KLUKOWSKA-RÖTZLER J, STEINBORN R, BUCHINGER S, GERBER V, BRANDT S. Intralesional bovine papillomavirus DNA loads reflect severity of equine sarcoid disease. Equine Vet J 2010; 42:327-31. [DOI: 10.1111/j.2042-3306.2010.00078.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Bovine papillomavirus type 1 E2 and E7 proteins down-regulate Toll Like Receptor 4 (TLR4) expression in equine fibroblasts. Virus Res 2010; 149:124-7. [DOI: 10.1016/j.virusres.2010.01.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Revised: 01/18/2010] [Accepted: 01/19/2010] [Indexed: 02/03/2023]
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van Dyk E, Oosthuizen MC, Bosman AM, Nel PJ, Zimmerman D, Venter EH. Detection of bovine papillomavirus DNA in sarcoid-affected and healthy free-roaming zebra (Equus zebra) populations in South Africa. J Virol Methods 2009; 158:141-51. [DOI: 10.1016/j.jviromet.2009.02.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2008] [Revised: 01/23/2009] [Accepted: 02/05/2009] [Indexed: 11/26/2022]
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20
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The detection of Bovine Papillomavirus type 1 DNA in flies. Virus Res 2009; 144:315-7. [PMID: 19409942 DOI: 10.1016/j.virusres.2009.04.015] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2009] [Revised: 04/22/2009] [Accepted: 04/22/2009] [Indexed: 11/24/2022]
Abstract
BPVs are double stranded DNA viruses that can infect several species other than the natural host, cattle, including equids. In equids, BPV-1, and, less commonly BPV-2, infection gives rise to fibroblastic tumours of the skin. Whilst a causal relationship between BPV-1/2 and equine sarcoids is now well established, how the disease is transmitted is not known. In this study we show BPV-1 DNA can be detected in flies trapped in the proximity of sarcoid-affected animals. Sequence analysis of the BPV-1 LCR from flies indicates that flies harbour BPV-1 LCR sequence variants II and IV which are commonly detected in equine sarcoids. These data suggest that flies may be able to transmit BPV-1 between equids.
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Haugen TH, Lace MJ, Ishiji T, Sameshima A, Anson JR, Turek LP. Cellular factors are required to activate bovine papillomavirus-1 early gene transcription and to establish viral plasmid persistence but are not required for cellular transformation. Virology 2009; 389:82-90. [PMID: 19410271 DOI: 10.1016/j.virol.2009.04.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2009] [Revised: 03/27/2009] [Accepted: 04/06/2009] [Indexed: 11/17/2022]
Abstract
Transcription from the major upstream early gene promoter, P89, of bovine papillomavirus (BPV)-1 is detectable in transfected cells lacking viral gene products yet also responds to viral E2 proteins. In contrast to human papillomaviruses (HPVs), the BPV upstream regulatory region (URR) functions as a transcriptional enhancer in epithelial cells and fibroblasts of bovine, murine or human origin. Mutations of Sp1 and/or two novel transcriptional enhancer factor (TEF)-1 sites within the 5' URR of the intact BPV-1 genome dramatically reduced P89-initiated mRNA levels, leading to decreased BPV-1 plasmid amplification and inefficient formation of transformed cell foci. However, cell lines transformed with wt or mutant BPV-1 genomes contained similar levels of unintegrated BPV-1 DNA, P89 mRNA and E2-dependent transactivation. We conclude that cellular factors necessary for activating viral early gene transcription, establishment of viral plasmid replication and cell immortalization are not required during the maintenance phase of BPV-1 infection.
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Affiliation(s)
- Thomas H Haugen
- Veterans Affairs Medical Center, The Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA.
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Angelos J, Oppenheim Y, Rebhun W, Mohammed H, Antczak DF. Evaluation of breed as a risk factor for sarcoid and uveitis in horses. Anim Genet 2009; 19:417-25. [PMID: 3232865 DOI: 10.1111/j.1365-2052.1988.tb00833.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The relationship between breed and the risk of developing sarcoid tumours or uveitis of unknown etiology was evaluated in a retrospective study of 16242 equine cases admitted between 1975 and 1987 to the New York State College of Veterinary Medicine Large Animal Hospital, and 3198 equine tissue samples sent to the New York State Veterinary Diagnostic Laboratory between 1977 and 1987. Of 120 sarcoid cases from the Large Animal Hospital, sarcoids were twice as likely to develop in Quarter Horses (odds ratio, OR = 1.8, P less than 0.05) relative to Thoroughbreds and less than half as likely to develop in Standardbreds (OR = 0.2, P less than 0.001) relative to Thoroughbreds. Similarly, of 376 sarcoid cases from the Diagnostic Laboratory, Quarter Horses had a significantly higher risk of developing sarcoid (OR = 2.0, P less than 0.001) relative to Thoroughbreds, while Standardbreds had a significantly lower risk of developing sarcoid (OR = 0.5, P less than 0.05) relative to Thoroughbreds. In the uveitis diagnosis category, Appaloosas had a significantly higher risk of developing uveitis (OR = 6.4, P less than 0.001) relative to Thoroughbreds, while Standardbreds had a significantly lower risk of developing uveitis (OR = 0.4, P less than 0.05) relative to Thoroughbreds.
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Affiliation(s)
- J Angelos
- James A. Baker Institute for Animal Health, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853
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Nasir L, Campo MS. Bovine papillomaviruses: their role in the aetiology of cutaneous tumours of bovids and equids. Vet Dermatol 2008; 19:243-54. [PMID: 18927950 DOI: 10.1111/j.1365-3164.2008.00683.x] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bovine papillomavirus (BPV) is perhaps the most extensively studied animal papillomavirus. In cattle BPVs induce benign tumours of cutaneous or mucosal epithelia, called papillomas or warts. Cattle papillomas are benign tumours and generally regress without eliciting any serious clinical problems in the host, but occasionally persist and provide the focus for malignant transformation to squamous cell carcinoma, as in the case of cancer of the urinary bladder and cancer of the upper alimentary canal. BPV is the only papillomavirus that jumps species: the virus also infects equids, and gives rise to fibroblastic tumours called sarcoids. Sarcoids very rarely regress, more often they persist and can be locally aggressive. These tumours are the most common dermatological tumour of equids worldwide. The purpose of this review is to discuss the biology of BPV, the biology of bovine tumours and equine sarcoids, and present the current understanding of BPV in tumour pathogenesis in its natural host, cattle, and in its heterologous host, equids. Finally, the use of anti-BPV vaccines as a therapy for equine sarcoids will be discussed. Only limited information on the clinical or pathological aspects of either bovine or equine tumours will be provided as this subject has been extensively addressed previously.
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Affiliation(s)
- Lubna Nasir
- Division of Pathological Sciences, Institute of Comparative Medicine, University of Glasgow, Garscube Estate, Glasgow G61 1QH.
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Brandt S, Haralambus R, Schoster A, Kirnbauer R, Stanek C. Peripheral blood mononuclear cells represent a reservoir of bovine papillomavirus DNA in sarcoid-affected equines. J Gen Virol 2008; 89:1390-1395. [PMID: 18474554 DOI: 10.1099/vir.0.83568-0] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Bovine papillomaviruses of types 1 and 2 (BPV-1 and -2) chiefly contribute to equine sarcoid pathogenesis. However, the mode of virus transmission and the presence of latent infections are largely unknown. This study established a PCR protocol allowing detection of <or=10 copies of the BPV-1/-2 genes E5 and L1. Subsequent screening of peripheral blood mononuclear cell (PBMC) DNA derived from horses with and without BPV-1/2-induced skin lesions demonstrated the exclusive presence of E5, but not L1, in PBMCs of BPV-1/2-infected equines. To validate this result, a blind PCR was performed from enciphered PBMC DNA derived from 66 horses, revealing E5 in the PBMCs of three individuals with confirmed sarcoids, whereas the remaining 63 sarcoid-free animals were negative for this gene. L1 could not be detected in any PBMC DNA, suggesting either deletion or interruption of this gene in PBMCs of BPV-1/-2-infected equines. These results support the hypothesis that PBMCs may serve as host cells for BPV-1/-2 DNA and contribute to virus latency.
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Affiliation(s)
- Sabine Brandt
- Equine Centre, Veterinary University Vienna, Vienna, Austria
| | - Rhea Haralambus
- Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Berne, Berne, Switzerland.,Equine Centre, Veterinary University Vienna, Vienna, Austria
| | | | - Reinhard Kirnbauer
- Department of Dermatology, Division of Immunology, Allergy and Infectious Diseases, Medical University Vienna, Vienna, Austria
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Brandt S, Haralambus R, Shafti-Keramat S, Steinborn R, Stanek C, Kirnbauer R. A subset of equine sarcoids harbours BPV-1 DNA in a complex with L1 major capsid protein. Virology 2008; 375:433-41. [PMID: 18395238 DOI: 10.1016/j.virol.2008.02.014] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 11/30/2007] [Accepted: 02/14/2008] [Indexed: 10/22/2022]
Abstract
Bovine papillomavirus type 1 or 2 (BPV-1, BPV-2) are accepted causal factors in equine sarcoid pathogenesis. Whereas viral genomes are consistently found and expressed within lesions, intact virions have never been detected, thus permissiveness of sarcoids for BPV-1 replication remains unclear. To reassess this issue, an immunocapture PCR (IC/PCR) was established using L1-specific antibodies to capture L1-DNA complexes followed by amplification of the viral genome. Following validation of the assay, 13 sarcoid-bearing horses were evaluated by IC/PCR. Samples were derived from 21 tumours, 4 perilesional/intact skin biopsies, and 1 serum. Tissue extracts from sarcoid-free equines served as controls. IC/PCR scored positive in 14/24 (58.3%) specimens obtained from sarcoid-patients, but negative for controls. Quantitative IC/PCR demonstrated <125 immunoprecipitable viral genomes/50 microl extract for the majority of specimens. Moreover, full-length BPV-1 genomes were detected in a complex with L1 proteins. These complexes may correspond to virion precursors or intact virions.
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Affiliation(s)
- S Brandt
- Equine Biotechnology Unit (EBU), Equine Centre, Veterinary University Vienna, Vienna, Austria.
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26
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Löhr CV, Juan-Sallés C, Rosas-Rosas A, Parás García A, Garner MM, Teifke JP. Sarcoids in captive zebras (Equus burchellii): association with bovine papillomavirus type 1 infection. J Zoo Wildl Med 2007; 36:74-81. [PMID: 17315460 DOI: 10.1638/03-126] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Sarcoids were diagnosed in two captive zebras from different facilities. Zebra 1 (Equus burchellii boehmi) was a 4.5-yr-old, captive-born male that presented with a 9- by 7-cm inguinal mass. Seven months after surgical excision of the inguinal mass, the zebra presented with a similar lesion in the right upper eyelid that has relapsed repeatedly and has not responded to treatment including local cisplatin injections and cryosurgery. Zebra 2 (of undetermined taxon) was housed at a private wild animal farm. The zebra presented with a single, raised, 2.5- by 2.0- by 2.0-cm, ulcerated mass on the nose, and surgical excision was curative. Histologically, the three masses consisted of a dermal, compact, nonencapsulated, poorly demarcated neoplasm composed of well-differentiated spindle cells arranged in streams and whorls and accompanied by moderate epidermal hyperplasia with long rete pegs. On the basis of the morphologic resemblance to the unique equine cutaneous neoplasm, "sarcoid" was diagnosed. This is the first description of sarcoids in captive zebras. Association with bovine papillomavirus (BPV) type 1, as it occurs in horses, was demonstrated by polymerase chain reaction, nucleic acid sequencing, and in situ hybridization (ISH) on paraffin-embedded tissues from the inguinal mass of zebra 1. Sequencing revealed 98% identity of the 244-bp fragment with BPV type 1. The ISH for BPV type 1 DNA intensely stained the nuclei of neoplastic mesenchymal spindle cells. The sites and the clinical behavior of the sarcoids in these zebras are similar to those described in horses.
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Affiliation(s)
- Christiane V Löhr
- Department of Biomedical Science, College of Veterinary Medicine, Oregon State University 97331-4808, USA
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27
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Yuan Z, Gallagher A, Gault EA, Campo MS, Nasir L. Bovine papillomavirus infection in equine sarcoids and in bovine bladder cancers. Vet J 2006; 174:599-604. [PMID: 17150387 DOI: 10.1016/j.tvjl.2006.10.012] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2006] [Revised: 10/06/2006] [Accepted: 10/13/2006] [Indexed: 11/17/2022]
Abstract
Bovine papillomavirus (BPV) type 2 is involved in carcinogenesis of the urinary bladder in cattle, while BPV-1 is commonly associated with equine sarcoid tumours. In both cases the early viral proteins are expressed, but virion is not produced. Given the similarities in BPV biology between the tumours in cattle and horses, bovine bladder cancers and equine sarcoids were compared with respect to physical status, load of viral DNA and variability of the E5 open reading frame (ORF). Rolling circle amplification demonstrated that BPV-1 and BPV-2 genomes exist as double stranded, episomal, circular forms in the two tumours. Realtime quantitative PCR revealed that equine sarcoids contained higher viral DNA loads compared to bovine bladder cancers. The BPV-1 E5 ORF showed sequence variation but BPV-2 ORF did not. The presence of BPV-1 E5 variations or their absence in the BPV-2 E5 ORF does not appear to have an effect on viral DNA load in either tumour type.
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Affiliation(s)
- Zhengqiang Yuan
- Division of Pathological Sciences, Institute of Comparative Medicine, Faculty of Veterinary Medicine, University of Glasgow, Bearsden Road, Glasgow G61 1QH, Scotland, UK
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28
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Yuan Z, Philbey AW, Gault EA, Campo MS, Nasir L. Detection of bovine papillomavirus type 1 genomes and viral gene expression in equine inflammatory skin conditions. Virus Res 2006; 124:245-9. [PMID: 17140693 DOI: 10.1016/j.virusres.2006.10.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2006] [Revised: 10/23/2006] [Accepted: 10/23/2006] [Indexed: 11/22/2022]
Abstract
Papillomaviruses are normally strictly species-specific and even under experimental conditions do not usually infect any other host than the natural host. The only documented reports of natural papillomavirus cross-species infection are of BPV-1/BPV-2, which can infect horses and induce equine sarcoids. BPV DNA has not been detected in non-sarcoid equine tumours or equine papillomas, but its presence has been reported in some cases of equine dermatitis. In the present study, we show that equine inflammatory skin conditions harbour episomal circular double stranded BPV-1 genomes, with copy numbers ranging from 0.2 to 155 copies/cell. BPV-1 E1, E2 and E5 genes were expressed in these inflammatory skin lesions, indicating active infection. We conclude that some cases of equine dermatitis are associated with the presence of circular, episomally maintained BPV-1 genomes that express viral transcripts.
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Affiliation(s)
- Zhengqiang Yuan
- Institute of Comparative Medicine, University of Glasgow Veterinary School, Bearsden Road, Glasgow G61 1QH, Scotland, UK
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29
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Chambers G, Ellsmore VA, O'Brien PM, Reid SWJ, Love S, Campo MS, Nasir L. Association of bovine papillomavirus with the equine sarcoid. J Gen Virol 2003; 84:1055-1062. [PMID: 12692268 DOI: 10.1099/vir.0.18947-0] [Citation(s) in RCA: 135] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
The equine sarcoid, a locally aggressive, fibroblastic skin tumour, is the most common dermatological neoplasm reported in horses; there is no consistently effective therapy. It is widely accepted that bovine papillomavirus (BPV) types 1 and 2 are associated with the pathogenesis of sarcoid disease. Most sarcoids appear to contain detectable viral DNA and RNA and are also known to express the BPV types 1 and 2 major transforming protein, E5, but appear not to produce infectious virions. While the mode of transmission of infection has not been elucidated, viral gene expression, in particular of E5, may contribute to virus persistence and disease pathogenesis by downregulating MHC class I expression. Here, the pathology and epidemiology of the sarcoid and its association with BPV is reviewed; the transforming functions of the BPV oncoproteins and their possible role in sarcoid pathogenesis are discussed; and the practical implications of BPV infection for diagnostic and therapeutic purposes are considered.
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Affiliation(s)
- G Chambers
- Institute of Comparative Medicine, Department of Veterinary Pathology, University of Glasgow Veterinary School, Garscube Estate, Glasgow G61 1QH, UK
| | - V A Ellsmore
- Department of Veterinary Clinical Studies, University of Glasgow Veterinary School, Garscube Estate, Glasgow G61 1QH, UK
| | - P M O'Brien
- Institute of Comparative Medicine, Department of Veterinary Pathology, University of Glasgow Veterinary School, Garscube Estate, Glasgow G61 1QH, UK
| | - S W J Reid
- Department of Veterinary Clinical Studies, University of Glasgow Veterinary School, Garscube Estate, Glasgow G61 1QH, UK
| | - S Love
- Department of Veterinary Clinical Studies, University of Glasgow Veterinary School, Garscube Estate, Glasgow G61 1QH, UK
| | - M S Campo
- Institute of Comparative Medicine, Department of Veterinary Pathology, University of Glasgow Veterinary School, Garscube Estate, Glasgow G61 1QH, UK
| | - L Nasir
- Department of Veterinary Clinical Studies, University of Glasgow Veterinary School, Garscube Estate, Glasgow G61 1QH, UK
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Martens A, De Moor A, Demeulemeester J, Peelman L. Polymerase chain reaction analysis of the surgical margins of equine sarcoids for bovine papilloma virus DNA. Vet Surg 2001; 30:460-7. [PMID: 11555822 DOI: 10.1053/jvet.2001.25874] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE To examine apparently normal skin around equine sarcoids for evidence of bovine papilloma virus (BPV) DNA, and to relate this finding to the observed recurrence after surgery. STUDY DESIGN Prospective study. ANIMALS OR SAMPLE POPULATION Forty-one equine sarcoids from 19 horses. MATERIALS AND METHODS The tumors were surgically excised at a measured distance of 8, 12, or 16 mm. Samples from the tumor and of the entire surrounding skin were taken at 4, 8, 12, and 16 mm from the tumor border and analyzed for the presence of BPV DNA using polymerase chain reaction (PCR) amplification. The samples were grouped per examined sarcoid, and a tumor was considered positive at a certain distance as soon as at least one of the samples at that distance was positive. The clinical outcome was recorded for each sarcoid after a minimal follow-up of 6 months. RESULTS All sarcoids were positive for BPV(1) or BPV(2). The tumor margin was positive at 4, 8, 12, and 16 mm in, respectively, 95%, 73%, 39%, and 33% of the examined sarcoids. Local recurrence was observed in 3 sarcoids on 3 different horses. From survival analysis, there was a greater likelihood for local recurrence when sarcoids had a surgical margin that was positive for BPV DNA. CONCLUSIONS AND CLINICAL RELEVANCE BPV DNA is often detected in visibly normal skin around sarcoids, and there is a significantly greater probability for local recurrence when the surgical margins are positive for the presence of BPV DNA.
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Affiliation(s)
- A Martens
- Department of Large Animal Surgery and Anesthesiology, Faculty of Veterinary Medicine, Ghent University, Belgium
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31
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Carr EA, Théon AP, Madewell BR, Hitchcock ME, Schlegel R, Schiller JT. Expression of a transforming gene (E5) of bovine papillomavirus in sarcoids obtained from horses. Am J Vet Res 2001; 62:1212-7. [PMID: 11497440 DOI: 10.2460/ajvr.2001.62.1212] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine expression of a transforming gene (E5) of bovine papillomavirus in sarcoids, other tumors, and normal skin samples collected from horses with and without sarcoids. SAMPLE POPULATION 23 sarcoids and 6 samples of normal skin obtained from 16 horses with sarcoids, 2 samples of normal skin and 2 papillomas obtained from horses without sarcoids, and 1 papilloma obtained from a cow. PROCEDURE Protein was extracted from tissue samples collected from horses and incubated with agarose beads covalently coupled to Staphylococcus aureus protein A and an anti-E5 polyclonal antibody. Following incubation, proteins were eluted from the beads and electrophoresed on a 14% polyacrylamide gel and transferred to a polyvinylidene difluoride membrane. The E5 protein was detected by use of western blot analysis, using a chemiluminescence detection system. RESULTS All 23 sarcoids had positive results for expression of E5 protein. Quantity of viral protein appeared to vary among sarcoids. All other tissues examined had negative results for E5 protein. Highest expression for E5 protein was observed in biologically aggressive fibroblastic variants of sarcoids, compared with expression in quiescent tumors. CONCLUSIONS AND CLINICAL RELEVANCE This study documented that activation and expression of the E5 gene is evident in sarcoids obtained from horses. These data support the conclusion that infection with bovine papillomavirus is important in the initiation or progression of sarcoids in horses. Treatment strategies designed to increase immune recognition of virally infected cells are warranted.
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MESH Headings
- Animals
- Blotting, Western/veterinary
- Bovine papillomavirus 1/genetics
- Bovine papillomavirus 1/metabolism
- DNA, Viral/chemistry
- DNA, Viral/genetics
- Electrophoresis, Polyacrylamide Gel/veterinary
- Gene Expression Regulation, Viral
- Horse Diseases/pathology
- Horse Diseases/virology
- Horses
- Oncogene Proteins, Viral/biosynthesis
- Oncogene Proteins, Viral/genetics
- Papillomavirus Infections/pathology
- Papillomavirus Infections/veterinary
- Papillomavirus Infections/virology
- Polymerase Chain Reaction/veterinary
- Precipitin Tests/veterinary
- Sarcoidosis/pathology
- Sarcoidosis/veterinary
- Sarcoidosis/virology
- Skin Diseases, Infectious/pathology
- Skin Diseases, Infectious/veterinary
- Skin Diseases, Infectious/virology
- Transcription, Genetic/genetics
- Tumor Virus Infections/pathology
- Tumor Virus Infections/veterinary
- Tumor Virus Infections/virology
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Affiliation(s)
- E A Carr
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis 95616, USA
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32
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Abstract
The sarcoid is a benign locally invasive dermal fibroblastic lesion, commonly affecting horses and donkeys. The aetiology of the equine sarcoid is equivocal. Bovine papillomaviral (BPV) DNA (type 1/2) is frequently demonstrable in equine sarcoid tumour biopsies. However, the exact role of the virus in the disease process and its contribution to the phenotypic differences in sarcoids is not known. It was sought to assess the transcriptional activity of BPV-1 found in sarcoid tissues. Of 20 tumours examined, 18 were positive for E2 expression and ten positive for L1 expression. Viral oncogenes E5, E6 and E7 transcripts were detected in 16, nine and 12 tumours, respectively. This study demonstrates BPV gene expression in equine sarcoids and provide the first evidence for a direct involvement of the virus in the pathogenesis of sarcoids.
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Affiliation(s)
- L Nasir
- Department of Veterinary Clinical Studies, University of Glasgow Veterinary School, UK
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Abstract
Sarcoids, the most common tumor of the horse, are fibroblastic, wart-like skin lesions that show variable manifestations. They are often invasive and recurrent, although they do not fulfill all criteria of malignancy. Due to their anatomic location, these tumors can sometimes cause loss of use of the horse. There is very strong evidence that sarcoids are caused by viruses closely related or identical to bovine papilloma viruses, and genetic studies have shown associations between genes in or near the equine major histocompatibility complex (MHC) and susceptibility to sarcoid. Several types of treatments have been successful in treating sarcoids, although the response to therapy is not consistent. Current treatment of sarcoids primarily involves antitumor therapy, but the development of preventative measures in the future may be directed against the causative papilloma virus. Sarcoid continues to be an important clinical entity for the equine practitioner.
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Affiliation(s)
- L Goodrich
- College of Veterinary Medicine, Cornell University, Ithaca, New York, USA
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34
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Nasir L, McFarlane ST, Torrontegui BO, Reid SW. Screening for bovine papillomavirus in peripheral blood cells of donkeys with and without sarcoids. Res Vet Sci 1997; 63:289-90. [PMID: 9491459 DOI: 10.1016/s0034-5288(97)90036-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Papillomaviral DNA has been identified in peripheral blood cells of both cattle and humans with and without associated disease and it has been suggested that such cells may act as sites of viral latency. In order to investigate the possibility of latent papillomaviral infection in the aetiopathogenesis of the equine sarcoid, peripheral blood derived DNA samples from 20 healthy and 34 sarcoid-affected donkeys were subject to polymerase chain reaction (PCR) using papillomaviral specific primers. Analysis of blood derived DNA samples failed to demonstrate the presence of papillomaviral DNA in any animal. Screening of 37 matched sarcoid derived DNA samples confirmed the presence of BPV in 34 diseased donkeys. This study supports the hypothesis of BPV as an aetiological agent in the equine sarcoid and suggests that latent virus in circulating peripheral blood cells does not play a role in the pathogenesis and epidemiology of the equine sarcoid.
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Affiliation(s)
- L Nasir
- Department of Veterinary Clinical Studies, University of Glasgow Veterinary School
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35
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Holt SE, Wilson VG. Mutational analysis of the 18-base-pair inverted repeat element at the bovine papillomavirus origin of replication: identification of critical sequences for E1 binding and in vivo replication. J Virol 1995; 69:6525-32. [PMID: 7666554 PMCID: PMC189554 DOI: 10.1128/jvi.69.10.6525-6532.1995] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Replication of bovine papillomavirus requires two viral proteins, E1 and E2-TA. Previously we demonstrated that sequences within an imperfect 18-bp inverted repeat (IR) element were sufficient to confer specific binding of the E1 protein to the origin region (S. E. Holt, G. Schuller, and V. G. Wilson, J. Virol. 68:1094-1102, 1994). To identify critical nucleotides for E1 binding and origin function, a series of individual point mutations was constructed at each nucleotide position in the 18-bp IR. Binding of E1 to these point mutations established that both the position of the mutation and the specific nucleotide change were important for the E1-DNA interaction. Equivalent mutations from each half of the IR exhibited similar binding, suggesting that the halves were functionally symmetric for E1 interactions. Each of these mutations was evaluated also for origin function in vivo by a transient-replication assay. No single point mutation eliminated replication capacity completely, though many mutants were severely impaired, demonstrating an important functional contribution for the E1 binding site. Furthermore, E1 binding was not sufficient for replication, as several origin mutants bound E1 well in vitro but replicated poorly in vivo. This suggests that certain nucleotides within the 18-bp IR may be involved in postbinding events necessary for replication initiation. The results with the point mutations suggest that E1-E1 interactions are important for stable complex formation and also indicate that there is some flexibility with regard to formation of a functional E1 replication complex at the origin.
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Affiliation(s)
- S E Holt
- Department of Medical Microbiology and Immunology, Texas A&M University Health Science Center, College Station 77843-1114, USA
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36
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Sequences homologous to 5' splice sites are required for the inhibitory activity of papillomavirus late 3' untranslated regions. Mol Cell Biol 1994. [PMID: 8035806 DOI: 10.1128/mcb.14.8.5278] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Expression of bovine papillomavirus type 1 (BPV-1) late genes is limited to terminally differentiated keratinocytes in an infected epithelium. We have previously shown that although the BPV-1 late polyadenylation site is functional in nonpermissive cells, a 53-nucleotide (nt) fragment of the late 3' untranslated region acts posttranscriptionally to reduce polyadenylated cytoplasmic RNA levels. This 53-nt fragment does not appear to function by destabilizing polyadenylated cytoplasmic RNA (P. A. Furth and C. C. Baker, J. Virol. 65:5806-5812, 1991). In this study, we used site-directed mutagenesis and deletion analysis to demonstrate that the sequence AAG/GUAAGU, which is identical to the consensus 5' splice site sequence, was both necessary and sufficient for the inhibitory activity of the 53-nt fragment. Furthermore, base pairing between the 5' end of the U1 small nuclear RNA and this 5' splice site-like sequence was shown to be required for the inhibitory activity in vivo. We have also further mapped the human papillomavirus type 16 late 3' inhibitory element (I. M. Kennedy, J. K. Haddow, and J. B. Clements, J. Virol. 65:2093-2097, 1991) to a 51-nt region containing four overlapping sequence motifs with partial homology to 5' splice sites. Mutation of each of these motifs demonstrated that only one of these motifs is required for the inhibitory activity. However, the presence of the other motifs may contribute to the full inhibitory activity of the element. No BPV-1 or human papillomavirus type 16 mRNAs which are spliced by using the potential 5' splice sites present in the viral late 3' untranslated regions have been identified. This suggests that the primary function of these 5' splice site-like sequences is the inhibition of late gene expression. The most likely mechanism of action of these elements is reduction of polyadenylation efficiency, perhaps through interference with 3'-terminal exon definition.
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37
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Furth PA, Choe WT, Rex JH, Byrne JC, Baker CC. Sequences homologous to 5' splice sites are required for the inhibitory activity of papillomavirus late 3' untranslated regions. Mol Cell Biol 1994; 14:5278-89. [PMID: 8035806 PMCID: PMC359047 DOI: 10.1128/mcb.14.8.5278-5289.1994] [Citation(s) in RCA: 85] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Expression of bovine papillomavirus type 1 (BPV-1) late genes is limited to terminally differentiated keratinocytes in an infected epithelium. We have previously shown that although the BPV-1 late polyadenylation site is functional in nonpermissive cells, a 53-nucleotide (nt) fragment of the late 3' untranslated region acts posttranscriptionally to reduce polyadenylated cytoplasmic RNA levels. This 53-nt fragment does not appear to function by destabilizing polyadenylated cytoplasmic RNA (P. A. Furth and C. C. Baker, J. Virol. 65:5806-5812, 1991). In this study, we used site-directed mutagenesis and deletion analysis to demonstrate that the sequence AAG/GUAAGU, which is identical to the consensus 5' splice site sequence, was both necessary and sufficient for the inhibitory activity of the 53-nt fragment. Furthermore, base pairing between the 5' end of the U1 small nuclear RNA and this 5' splice site-like sequence was shown to be required for the inhibitory activity in vivo. We have also further mapped the human papillomavirus type 16 late 3' inhibitory element (I. M. Kennedy, J. K. Haddow, and J. B. Clements, J. Virol. 65:2093-2097, 1991) to a 51-nt region containing four overlapping sequence motifs with partial homology to 5' splice sites. Mutation of each of these motifs demonstrated that only one of these motifs is required for the inhibitory activity. However, the presence of the other motifs may contribute to the full inhibitory activity of the element. No BPV-1 or human papillomavirus type 16 mRNAs which are spliced by using the potential 5' splice sites present in the viral late 3' untranslated regions have been identified. This suggests that the primary function of these 5' splice site-like sequences is the inhibition of late gene expression. The most likely mechanism of action of these elements is reduction of polyadenylation efficiency, perhaps through interference with 3'-terminal exon definition.
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Affiliation(s)
- P A Furth
- Laboratory of Tumor Virus Biology, National Cancer Institute, Bethesda, Maryland 20892
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38
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Turek LP. The structure, function, and regulation of papillomaviral genes in infection and cervical cancer. Adv Virus Res 1994; 44:305-56. [PMID: 7817876 DOI: 10.1016/s0065-3527(08)60332-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- L P Turek
- Veterans Affairs Medical Center, Iowa City, Iowa 52240
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39
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Marti E, Lazary S, Antczak DF, Gerber H. Report of the first international workshop on equine sarcoid. Equine Vet J 1993; 25:397-407. [PMID: 8223371 DOI: 10.1111/j.2042-3306.1993.tb02981.x] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- E Marti
- Klinik für Nutztiere und Pferde, Bern, Switzerland
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Schlatter B, Waghorne CG. Persistence of Ha-ras-induced metastatic potential of SP1 mouse mammary tumors despite loss of the Ha-ras shuttle vector. Proc Natl Acad Sci U S A 1992; 89:9986-90. [PMID: 1438249 PMCID: PMC50262 DOI: 10.1073/pnas.89.21.9986] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Previous studies have shown that the SP1 mouse mammary adenocarcinoma cell line, which is tumorigenic but nonmetastatic, acquires metastatic potential when transfected with the activated human Ha-ras gene. In addition, the process of calcium phosphate-mediated DNA transfection, as well as treatment with the calcium ionophore A23187 or with phorbol 12-myristate 13-acetate, can also result in heritable changes in the malignant behavior of SP1 cells. It was of interest, therefore, to determine whether the metastatic consequences of Ha-ras oncogene expression in SP1 cells are a primary effect of the transfected gene or whether heritable secondary changes are induced by Ha-ras oncogene expression. In the latter case, continued expression of the Ha-ras oncogene would not be required to maintain the metastatic phenotype. To test this hypothesis we introduced the Ha-ras oncogene into SP1 cells on a shuttle vector in which maintenance of the vector was dependent on selection for resistance to the antibiotic G418. Subclones which had lost the transfected Ha-ras gene were subsequently isolated following growth in nonselective medium. The Ha-ras-transfected clones and the revertant subclones were found to be equally metastatic, indicating that transfection with the Ha-ras gene does induce stable secondary changes in the metastatic phenotype of SP1 cells.
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Affiliation(s)
- B Schlatter
- Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada
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41
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Evidence that replication initiates at only some of the potential origins in each oligomeric form of bovine papillomavirus type 1 DNA. Mol Cell Biol 1990. [PMID: 2160593 DOI: 10.1128/mcb.10.6.3078] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In a subclone of ID13 mouse fibroblasts latently infected with bovine papillomavirus type 1 (BPV-1) DNA, the viral genome occurred as a mixture of extrachromosomal circular monomers and oligomers. Multiple copies were also associated with the host cell genome, predominantly at a single site in a head-to-tail tandem array. We examined the replicative intermediates of extrachromosomal forms of BPV-1 DNA by using two-dimensional gel electrophoresis. The results obtained indicate that initiation of DNA replication occurred near the center of the EcoRI-BamHI 5.6-kilobase fragment. In some molecules, however, this fragment was replicated from one end to the other by means of a single fork initiated elsewhere. Termination also occurred within this fragment. The EcoRI-BamHI 2.3-kilobase fragment replicated as a DNA molecule containing a termination site for DNA replication and also by means of a single fork traversing the fragment from one end to the other. Thus, replication forks proceeded through these fragments in different manners, apparently depending on whether they were part of a monomer, a dimer, a trimer, or higher oligomers. These observations lead to the conclusion that initiation of DNA replication in BPV-1 DNA takes place at or close to plasmid maintenance sequence 1. From this point, replication proceeds bidirectionally and termination occurs approximately 180 degrees opposite the origin. The results obtained are consistent with one or more replication origins being quiescent in BPV-1 DNA oligomers.
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42
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Schvartzman JB, Adolph S, Martín-Parras L, Schildkraut CL. Evidence that replication initiates at only some of the potential origins in each oligomeric form of bovine papillomavirus type 1 DNA. Mol Cell Biol 1990; 10:3078-86. [PMID: 2160593 PMCID: PMC360672 DOI: 10.1128/mcb.10.6.3078-3086.1990] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
In a subclone of ID13 mouse fibroblasts latently infected with bovine papillomavirus type 1 (BPV-1) DNA, the viral genome occurred as a mixture of extrachromosomal circular monomers and oligomers. Multiple copies were also associated with the host cell genome, predominantly at a single site in a head-to-tail tandem array. We examined the replicative intermediates of extrachromosomal forms of BPV-1 DNA by using two-dimensional gel electrophoresis. The results obtained indicate that initiation of DNA replication occurred near the center of the EcoRI-BamHI 5.6-kilobase fragment. In some molecules, however, this fragment was replicated from one end to the other by means of a single fork initiated elsewhere. Termination also occurred within this fragment. The EcoRI-BamHI 2.3-kilobase fragment replicated as a DNA molecule containing a termination site for DNA replication and also by means of a single fork traversing the fragment from one end to the other. Thus, replication forks proceeded through these fragments in different manners, apparently depending on whether they were part of a monomer, a dimer, a trimer, or higher oligomers. These observations lead to the conclusion that initiation of DNA replication in BPV-1 DNA takes place at or close to plasmid maintenance sequence 1. From this point, replication proceeds bidirectionally and termination occurs approximately 180 degrees opposite the origin. The results obtained are consistent with one or more replication origins being quiescent in BPV-1 DNA oligomers.
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MESH Headings
- Animals
- Binding Sites
- Blotting, Southern
- Bovine papillomavirus 1/genetics
- Cell Line
- Chromosomes/ultrastructure
- DNA Replication
- DNA, Circular/genetics
- DNA, Circular/isolation & purification
- DNA, Circular/ultrastructure
- DNA, Viral/genetics
- DNA, Viral/isolation & purification
- DNA, Viral/ultrastructure
- Electrophoresis, Gel, Two-Dimensional
- Electrophoresis, Polyacrylamide Gel
- Nucleic Acid Hybridization
- Papillomaviridae/genetics
- Restriction Mapping
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Affiliation(s)
- J B Schvartzman
- Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461
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43
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Van Obberghen-Schilling E, Thompson NL, Flanders KC, Sporn MB, Lambert PF, Baker CC. Transforming growth factor-beta expression in fibropapillomas induced by bovine papillomavirus type 1, in normal bovine skin, and in BPV-1-transformed cells. Growth Factors 1990; 2:111-21. [PMID: 2160257 DOI: 10.3109/08977199009071498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
There is substantial evidence to suggest that transforming growth factor-beta (TGF-beta) plays an important role in wound healing and tissue repair as well as in carcinogenesis. It has also been observed that naturally occurring bovine papillomavirus type 1 (BPV-1)-induced bovine fibropapillomas occur predominantly at traumatized sites of the body, suggesting that humoral factors released in wounds might be important for papillomavirus infection. We have therefore investigated the possible role of TGF-beta 1 in BPV-1 infections. Two antipeptide antibodies which recognize different epitopes in the N-terminus of TGF-beta 1 were used to localize TGF-beta 1 in bovine fibropapillomas and normal bovine skin using immunohistochemical methods. Staining by anti-LC(1-30) is intracellular in suprabasal keratinocytes of the epidermis as well as the hair follicles and sebaceous glands and correlates with known sites of TGF-beta 1 mRNA synthesis. Anti-CC(1-30) staining is extracellular in the immediately underlying dermis. Neither the pattern nor intensity of TGF-beta 1 staining was affected by BPV-1 infection. C127 cells and BPV-1-transformed C127 cells were compared for TGF-beta 1 mRNA expression and secretion of TGF-beta 1 peptide. Although the levels of messenger RNA and secreted TGF-beta 1 peptide were similar in both cell types, five- to six-fold greater amounts of TGF-beta-like activity per cell was detected in media conditioned by the uninfected cells. TGF-beta 1 treatment had no effect on the growth rate of either cell type or on BPV-1 gene expression in the transformed cells.
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Affiliation(s)
- E Van Obberghen-Schilling
- Laboratory of Chemoprevention, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892
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44
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Jacobson ER, Mansell JL, Sundberg JP, Hajjar L, Reichmann ME, Ehrhart LM, Walsh M, Murru F. Cutaneous fibropapillomas of green turtles (Chelonia mydas). J Comp Pathol 1989; 101:39-52. [PMID: 2677067 DOI: 10.1016/0021-9975(89)90075-3] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Six juvenile green turtles (Chelonia mydas) from the Indian River Lagoon System, Florida, U.S.A., with multiple cutaneous fibropapillomas, were kept in isolation and examined over a 6-month period. Histologically, the fibropapillomas consisted of a slightly to moderately hyperplastic epidermis overlying a thickened hypercellular dermis. In the earliest lesions, ballooning degeneration was present predominantly in the stratum basale where rete ridges extended into the dermis; aggregates of mixed inflammatory cells were present around dermal vessels. As the lesions matured, they developed an arborizing, papillary pattern. More mature lesions had a less verrucous, often ulcerated surface, with the dermis composed primarily of large collagenous fascicles and relatively few fibroblasts. While numerous trematode eggs were present within dermal capillaries of a histologically similar biopsy specimen from an Hawaiian green turtle, no trematode eggs were observed in any of 28 biopsies examined from the six Florida green turtles in this study. Low stringency Southern blot hybridization and a reverse Southern blot failed to demonstrate papillomavirus DNA in any of the samples extracted. Ultrastructural evaluation of the earliest lesions demonstrated membrane-bound intracytoplasmic vacuoles within epidermal cells in the stratum basale. Similar vacuoles were also observed in the epidermal intercellular spaces and within the dermis. Occasionally, particles with electron-dense centres and measuring 155 to 190 nm were observed in these vacuoles.
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Affiliation(s)
- E R Jacobson
- College of Veterinary Medicine, University of Florida, Gainesville
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45
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Tsang SS, Stich HF. Enhancement of bovine papillomavirus-induced cell transformation by tumour promoters. Cancer Lett 1988; 43:93-8. [PMID: 2849505 DOI: 10.1016/0304-3835(88)90219-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Cultured C3H/10T1/2 cells transfected with the plasmid pdBPV-1 were used as targets, and the frequency of transformed colonies as the endpoint to test the enhancing capacity of four promoters: 12-O-tetradecanoylphorbol-13-acetate (TPA), 4-O-methyl-tetradecanoylphorbol-13-acetate (4-O-methyl-TPA), mezerein and phorbol-12-retinoate-13-acetate (PRA). The frequency of the transfected C3H/10T1/2 cells to form transformed colonies was enhanced in the following order: mezerein greater than PRA greater than TPA greater than 4-O-methyl-TPA. The amount of promoters required to promote a tenfold increase in transformed cells was 0.24, 0.81, 30 and 100 ng/ml mezerein, PRA, TPA and 4-O-methyl-TPA, respectively. A significant promoting effect was obtained by a 3.5-day exposure to mezerein regardless of whether it was added at different time intervals after transfection with BPV-DNA. The examined promoters lacked genotoxic activity, as tested on Chinese hamster ovary cells, using chromatid aberrations and exchanges, frequency of macronuclei, unscheduled DNA synthesis (UDS) and inhibition of UDS as endpoints. The usefulness of BPV-1-induced transformation as a bioassay for detecting chemicals with promoting activities is discussed.
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Affiliation(s)
- S S Tsang
- Environmental Carcinogenesis Unit, British Columbia Cancer Research Centre, Vancouver, Canada
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46
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Tsang SS, Li G, Stich HF. Effect of retinoic acid on bovine papillomavirus (BPV) DNA-induced transformation and number of BPV DNA copies. Int J Cancer 1988; 42:94-8. [PMID: 2839430 DOI: 10.1002/ijc.2910420118] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The effect of all-trans-retinoic acid (RA) was examined on (1) transformation induced in C127 cells by transfection with plasmid pdBPV-1 (142-6), which contains DNA of bovine papillomavirus (BPV), (2) the capacity of transformed BPV DNA-containing clones to form colonies with transformed properties (e.g., piling up into multilayered colonies), and (3) the number of BPV DNA copies in transformed cells. At nontoxic doses ranging from 10(-7) to 10(-5) M, RA reduced the frequency of transformed foci in a dose-dependent manner. The extent of inhibition depended on the length of RA treatment and on the time that elapsed between DNA transfection and RA treatment. RA exerted only a slight inhibitory effect during the first days after transfection. Complete inhibition was observed when the cells were continuously exposed after transfection to RA at doses ranging from 0.5 to 1 X 10(-5) M. The inhibitory effect of RA on transformation was reversible. Transformed foci started to form after withdrawal of RA treatment. In the presence of RA (5 X 10(-6) M), cells from transformed colonies were no longer able to form foci displaying transformed properties. The number of BPV DNA copies gradually decreased when the cells were grown over several generations in the presence of RA (5 X 10(-6) M). After approximately 30 cell generations, the cell cultures appeared to have less than one copy of BPV DNA.
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Affiliation(s)
- S S Tsang
- Environmental Carcinogenesis Unit, British Columbia Cancer Research Centre, Vancouver, Canada
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47
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Burnett S, Moreno-Lopez J, Pettersson U. A novel spontaneous mutation of the bovine papillomavirus-1 genome. Plasmid 1988; 20:61-74. [PMID: 2853880 DOI: 10.1016/0147-619x(88)90008-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A cell clone (cl.2) having an atypical transformed morphology was isolated from a murine C127 cell culture experimentally infected with a bovine papillomavirus type 1 (BPV-1) virion preparation. cl.2 cells exhibited minimal transformed characteristics and contained multiple copies of a BPV-1 plasmid with a molecular size slightly less than that of the wild type viral genome. A simple deletion of 277 bp was mapped to the distal portion of the viral 69% transforming fragment where the early gene region merges with the late gene region. None of the recognized early open reading frames were affected by the deletion but sequences including the common early gene mRNA polyadenylation (poly(A] signal and several base pairs of the "distal" enhancer element were deleted. Transfection of C127 cultures with low molecular weight (Hirt) DNA prepared from cl.2 cells led to the appearance of transformed cell foci, and Southern blotting analysis of a cl.2 Hirt DNA-transformed cell line confirmed that the deletion did not destroy the ability to replicate as a high copy plasmid. Removal of the natural early poly(A) signal did not obligate use of the alternative natural viral poly(A) signal located towards the end of the late region. Instead, a new major early mRNA polyadenylation site was mapped close to the unique BamHI recognition sequence at the distal end of the transforming region. Our results underline previous observations that there is a block to the production of stable mRNAs from the late gene region in BPV-1-transformed C127 cells, yet this is not necessarily explained by premature termination of transcription within this region.
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Affiliation(s)
- S Burnett
- Department of Medical Genetics, University of Uppsala, Sweden
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48
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Harrison SM, Gearing KL, Kim SY, Kingsman AJ, Kingsman SM. Multiple cis-active elements in the long control region of bovine papillomavirus type 1 (BPV-1). Nucleic Acids Res 1987; 15:10267-84. [PMID: 2827118 PMCID: PMC339943 DOI: 10.1093/nar/15.24.10267] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
A 1.0 kb region of the BPV-1 genome (the long control region, LCR), contains controls for transcription and the origin of replication. Transcription directed by the LCR is activated by the viral encoded E2 protein. To define the essential cis acting elements that are required to control transcription we have constructed a series of deletions throughout the LCR. We have identified three important domains in the LCR, two of which respond to E2. We have analysed the ability of small subcloned regions of the E2 responsive domains to act as enhancers in a heterologous assay system. This has led to the identification of five independent E2 responsive elements. We have shown that a fragment of only 38 base pairs is sufficient to respond to activation by E2. We also present evidence to suggest two types of E2 responsiveness that result in strong or weak activation. Strong response is correlated with the presence of the sequence 5'-ACCG/TNNNC/TCGGTGC-3' whereas weak response is correlated with the presence of a related sequence 5'-ACC(N)6GGT-3'. The contribution of these multiple elements to viral transcription is discussed.
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Affiliation(s)
- S M Harrison
- Department of Biochemistry, University of Oxford, UK
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49
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Abstract
A number of viruses, most notably herpes virus type 2, have been suggested as etiological agents of cervical neoplasia. Recent studies with human papillomaviruses, however, have demonstrated a remarkable association of a subgroup of these viruses with about 90% of benign, preinvasive and invasive lesions of the cervix and anogenital tract. The oncogenic potential of papillomaviruses has been demonstrated both in laboratory animals and in cultured cells. Furthermore, susceptibility to certain human papillomaviruses has been associated with a recessive genetic defect that results in squamous cell carcinoma of the skin. The human papillomaviruses are difficult to study, however, because of the lack of an animal model, difficulty in developing a tissue culture system permissive for their replication, and a lack of understanding of their biology. Current understanding of the natural history of anogenital neoplasia may provide insights into the mechanisms the host uses to cope with potentially oncogenic human papillomaviruses.
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Affiliation(s)
- W D Lancaster
- Department of Astetrics and Gynecology and Pathology, Vincent T. Lombardi Cancer Research Center, Georgetown University Medical Center, Washington, D.C. 20007
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50
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Cripe TP, Haugen TH, Turk JP, Tabatabai F, Schmid PG, Dürst M, Gissmann L, Roman A, Turek LP. Transcriptional regulation of the human papillomavirus-16 E6-E7 promoter by a keratinocyte-dependent enhancer, and by viral E2 trans-activator and repressor gene products: implications for cervical carcinogenesis. EMBO J 1987; 6:3745-53. [PMID: 2448139 PMCID: PMC553845 DOI: 10.1002/j.1460-2075.1987.tb02709.x] [Citation(s) in RCA: 210] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The transcriptional promoter of the candidate E6-E7 transforming gene region of human papillomavirus (HPV)-16 (P97) was active in transiently transfected cervical carcinoma cells when linked to the HSV-1 tk or bacterial cat genes. Sequences 5' to P97 contain a short enhancer element responding to cellular factor(s) in uninfected human foreskin keratinocytes and in cervical carcinoma cells, but not in human or animal fibroblasts. The E2 trans-activator products of HPV-16 or of the related bovine papillomavirus (BPV)-1 further elevated HPV-16-driven transcripts in co-transfections, and required the presence of E2-binding ACC(N)6GGT cores in cis. A 'short E2' C-terminal repressor gene product (sE2) of HPV-16 or the BPV-1 sE2 repressor not only inhibited viral E2 trans-activation, but also suppressed enhancer response to keratinocytic factors. Suppression by the sE2 products was abolished by deletion of the E2-binding cores in cis or by a mutation in the sE2 DNA binding domain. The keratinocyte-dependent enhancer is likely to contribute to the epithelial cell tropism of HPV-16, and may direct persistent E6-E7 gene transcription in response to cellular factors in cervical carcinoma cells in which the viral E2 genes are inactive.
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Affiliation(s)
- T P Cripe
- Department of Pathology, Veterans Administration Medical Center, Iowa City, IA 52242
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