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Mendoza W, Isaza JP, López L, López-Herrera A, Gutiérrez LA. Bovine leukemia virus detection in humans: A systematic review and meta-analysis. Virus Res 2023; 335:199186. [PMID: 37532141 PMCID: PMC10425403 DOI: 10.1016/j.virusres.2023.199186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 07/26/2023] [Accepted: 07/30/2023] [Indexed: 08/04/2023]
Abstract
To review the available studies on the frequency of detection of the bovine leukemia virus in human samples, a systematic review with meta-analysis of the scientific literature was carried out, including papers published in English, Spanish, and Portuguese in 5 multidisciplinary databases. We collected information from different populations following a detailed and reproducible search protocol in which two researchers verified the inclusion and exclusion criteria. We identified 759 articles, of which only 33 met the inclusion criteria. Analyzed studies reported that the presence of the virus was measured in human samples, such as paraffin-embedded breast tissue and peripheral blood from 10,398 individuals, through serological and molecular techniques. An overall virus frequency of 27% (Ranging between 17 and 37%) was observed, with a high-frequency data heterogeneity between studies. The presence of this virus in different human biological samples suggests the need to investigate further its transmission route to humans and its potential role in developing and progressing diseases.
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Affiliation(s)
- Willington Mendoza
- Grupo Biología de Sistemas, Escuela de Ciencias de la Salud, Facultad de Medicina, Universidad Pontificia Bolivariana, Circular 1a Nº 70-01, Bloque 11C - Oficina 417, Medellín, Colombia
| | - Juan Pablo Isaza
- Grupo Biología de Sistemas, Escuela de Ciencias de la Salud, Facultad de Medicina, Universidad Pontificia Bolivariana, Circular 1a Nº 70-01, Bloque 11C - Oficina 417, Medellín, Colombia
| | - Lucelly López
- Grupo de Investigación en Salud Pública, Escuela de Ciencias de la Salud, Facultad de Medicina, Universidad Pontificia Bolivariana, Medellín, Colombia
| | - Albeiro López-Herrera
- Grupo de Investigación Biodiversidad y Genética Molecular (BIOGEM), Universidad Nacional de Colombia Sede Medellín, Colombia
| | - Lina A Gutiérrez
- Grupo Biología de Sistemas, Escuela de Ciencias de la Salud, Facultad de Medicina, Universidad Pontificia Bolivariana, Circular 1a Nº 70-01, Bloque 11C - Oficina 417, Medellín, Colombia.
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González Méndez AS, Cerón-Téllez F, Sarmiento Silva RE, Tórtora Pérez JL, Rojas-Anaya E, Álvarez HR. Presence of co-infection between bovine leukemia virus and bovine herpesvirus 1 in herds vaccinated against bovine respiratory complex. Can J Vet Res 2023; 87:105-109. [PMID: 37020574 PMCID: PMC10069155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/07/2022] [Indexed: 04/07/2023]
Abstract
The aim of this study was molecular identification of bovine leukemia virus and possible co-infection with bovine respiratory disease complex (BRDC) viral agents in Mexican dairy herds. We collected 533 blood samples from cattle vaccinated against the BRDC virus in 9 states across Mexico. Peripheral blood leukocytes were removed and genetic material was extracted to detect bovine leukemia virus (BLV), bovine herpesvirus 1 (BoHV-1), bovine viral diarrhea virus (BVDV), bovine parainfluenza virus 3 (BPIV-3), and bovine respiratory syncytial virus (BRSV) infection using polymerase chain reaction. We identified high BLV infection rates in 270 cattle (50.65%). One hundred and thirty-three cows (24.95%) tested positive for BoHV-1, of which 65 samples were positive for both viruses (BoHV-1 and BLV) and 68 were only positive for BoHV-1. Only 4 samples tested positive for BPIV-3 and no sample was positive for BVDV or BRSV. Relative risk and odds ratio analyses did not identify that the presence of BLV infection favors BoHV-1 co-infection in vaccinated herds.
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Affiliation(s)
- Ana S González Méndez
- Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4. National Autonomous University of Mexico. Km. 2.5 Cuautitlan-Teoloyucan San Sebastian Xhala Highway. Cuautitlan Izcalli, State of Mexico. C.P. 54714. Mexico (González Méndez, Tórtora Pérez, Ramírez Álvarez); National Center for Research in Animal Health and Safety, INIFAP, CP. 05110, Mexico City, Mexico (Cerón-Téllez); Department of Microbiology and Immunology, Faculty of Veterinary Medicine and Zootechnics, National Autonomous University of Mexico, University City, Mexico City, Mexico (Sarmiento Silva); Pacific Center Research Center. INIFAP, CP. 44660, Guadalajara, Jalisco, Mexico (Rojas-Anaya)
| | - Fernando Cerón-Téllez
- Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4. National Autonomous University of Mexico. Km. 2.5 Cuautitlan-Teoloyucan San Sebastian Xhala Highway. Cuautitlan Izcalli, State of Mexico. C.P. 54714. Mexico (González Méndez, Tórtora Pérez, Ramírez Álvarez); National Center for Research in Animal Health and Safety, INIFAP, CP. 05110, Mexico City, Mexico (Cerón-Téllez); Department of Microbiology and Immunology, Faculty of Veterinary Medicine and Zootechnics, National Autonomous University of Mexico, University City, Mexico City, Mexico (Sarmiento Silva); Pacific Center Research Center. INIFAP, CP. 44660, Guadalajara, Jalisco, Mexico (Rojas-Anaya)
| | - Rosa E Sarmiento Silva
- Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4. National Autonomous University of Mexico. Km. 2.5 Cuautitlan-Teoloyucan San Sebastian Xhala Highway. Cuautitlan Izcalli, State of Mexico. C.P. 54714. Mexico (González Méndez, Tórtora Pérez, Ramírez Álvarez); National Center for Research in Animal Health and Safety, INIFAP, CP. 05110, Mexico City, Mexico (Cerón-Téllez); Department of Microbiology and Immunology, Faculty of Veterinary Medicine and Zootechnics, National Autonomous University of Mexico, University City, Mexico City, Mexico (Sarmiento Silva); Pacific Center Research Center. INIFAP, CP. 44660, Guadalajara, Jalisco, Mexico (Rojas-Anaya)
| | - Jorge L Tórtora Pérez
- Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4. National Autonomous University of Mexico. Km. 2.5 Cuautitlan-Teoloyucan San Sebastian Xhala Highway. Cuautitlan Izcalli, State of Mexico. C.P. 54714. Mexico (González Méndez, Tórtora Pérez, Ramírez Álvarez); National Center for Research in Animal Health and Safety, INIFAP, CP. 05110, Mexico City, Mexico (Cerón-Téllez); Department of Microbiology and Immunology, Faculty of Veterinary Medicine and Zootechnics, National Autonomous University of Mexico, University City, Mexico City, Mexico (Sarmiento Silva); Pacific Center Research Center. INIFAP, CP. 44660, Guadalajara, Jalisco, Mexico (Rojas-Anaya)
| | - Edith Rojas-Anaya
- Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4. National Autonomous University of Mexico. Km. 2.5 Cuautitlan-Teoloyucan San Sebastian Xhala Highway. Cuautitlan Izcalli, State of Mexico. C.P. 54714. Mexico (González Méndez, Tórtora Pérez, Ramírez Álvarez); National Center for Research in Animal Health and Safety, INIFAP, CP. 05110, Mexico City, Mexico (Cerón-Téllez); Department of Microbiology and Immunology, Faculty of Veterinary Medicine and Zootechnics, National Autonomous University of Mexico, University City, Mexico City, Mexico (Sarmiento Silva); Pacific Center Research Center. INIFAP, CP. 44660, Guadalajara, Jalisco, Mexico (Rojas-Anaya)
| | - Hugo Ramírez Álvarez
- Virology, Genetics and Molecular Biology Laboratory, Faculty of Higher Education, Cuautitlan, Veterinary Medicine, Campus 4. National Autonomous University of Mexico. Km. 2.5 Cuautitlan-Teoloyucan San Sebastian Xhala Highway. Cuautitlan Izcalli, State of Mexico. C.P. 54714. Mexico (González Méndez, Tórtora Pérez, Ramírez Álvarez); National Center for Research in Animal Health and Safety, INIFAP, CP. 05110, Mexico City, Mexico (Cerón-Téllez); Department of Microbiology and Immunology, Faculty of Veterinary Medicine and Zootechnics, National Autonomous University of Mexico, University City, Mexico City, Mexico (Sarmiento Silva); Pacific Center Research Center. INIFAP, CP. 44660, Guadalajara, Jalisco, Mexico (Rojas-Anaya)
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Fonseca Júnior AA, Ferreira LR, Laguardia-Nascimento M, Rivetti Júnior AV, Bueno BL, Dos Reis JKP, Camargos MF. Evaluation of three different genomic regions for detection of bovine leukemia virus by real-time PCR. Braz J Microbiol 2021; 52:2483-2488. [PMID: 34595727 DOI: 10.1007/s42770-021-00613-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 09/19/2021] [Indexed: 11/26/2022] Open
Abstract
Bovine leukemia virus (BLV) is an oncogenic member of the genus Deltaretrovirus. BLV infects cattle worldwide and is responsible for significant economic losses. The objective of this study was to validate real-time quantitative PCR (qPCR) for the detection of BLV. After identification of the most efficient qPCR, the limits of detection, repeatability, and reproducibility were determined. The results indicate that qPCR can be easily reproduced between laboratories with high sensitivity. The test variation was low in samples from lesions suggestive of bovine leukosis or whole blood.
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Affiliation(s)
- Antônio Augusto Fonseca Júnior
- Laboratório Federal de Defesa Agropecuária de Minas Gerais, Avenida Rômulo Joviano, Centro, Pedro Leopoldo, Minas Gerais, 33600-000, Brazil.
- Centro Universitário de Sete Lagoas, UNIFEMM, Sete Lagoas, Brazil.
| | - Luciana Rabello Ferreira
- Laboratório Federal de Defesa Agropecuária de Minas Gerais, Avenida Rômulo Joviano, Centro, Pedro Leopoldo, Minas Gerais, 33600-000, Brazil
| | - Mateus Laguardia-Nascimento
- Laboratório Federal de Defesa Agropecuária de Minas Gerais, Avenida Rômulo Joviano, Centro, Pedro Leopoldo, Minas Gerais, 33600-000, Brazil
| | - Anselmo Vasconcelos Rivetti Júnior
- Laboratório Federal de Defesa Agropecuária de Minas Gerais, Avenida Rômulo Joviano, Centro, Pedro Leopoldo, Minas Gerais, 33600-000, Brazil
| | | | | | - Marcelo Fernandes Camargos
- Laboratório Federal de Defesa Agropecuária de Minas Gerais, Avenida Rômulo Joviano, Centro, Pedro Leopoldo, Minas Gerais, 33600-000, Brazil
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Olaya-Galán NN, Salas-Cárdenas SP, Rodriguez-Sarmiento JL, Ibáñez-Pinilla M, Monroy R, Corredor-Figueroa AP, Rubiano W, de la Peña J, Shen H, Buehring GC, Patarroyo MA, Gutierrez MF. Risk factor for breast cancer development under exposure to bovine leukemia virus in Colombian women: A case-control study. PLoS One 2021; 16:e0257492. [PMID: 34547016 PMCID: PMC8454960 DOI: 10.1371/journal.pone.0257492] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 09/02/2021] [Indexed: 11/19/2022] Open
Abstract
Viruses have been implicated in cancer development in both humans and animals. The role of viruses in cancer is typically to initiate cellular transformation through cellular DNA damage, although specific mechanisms remain unknown. Silent and long-term viral infections need to be present, in order to initiate cancer disease. In efforts to establish a causative role of viruses, first is needed to demonstrate the strength and consistency of associations in different populations. The aim of this study was to determine the association of bovine leukemia virus (BLV), a causative agent of leukemia in cattle, with breast cancer and its biomarkers used as prognosis of the severity of the disease (Ki67, HER2, hormonal receptors) in Colombian women. An unmatched, observational case-control study was conducted among women undergoing breast surgery between 2016-2018. Malignant samples (n = 75) were considered as cases and benign samples (n = 83) as controls. Nested-liquid PCR, in-situ PCR and immunohistochemistry were used for viral detection in blood and breast tissues. For the risk assessment, only BLV positive samples from breast tissues were included in the analysis. BLV was higher in cases group (61.3%) compared with controls (48.2%), with a statistically significant association between the virus and breast cancer in the unconditional logistic regression (adjusted-OR = 2.450,95%CI:1.088-5.517, p = 0.031). In this study, BLV was found in both blood and breast tissues of participants and an association between breast cancer and the virus was confirmed in Colombia, as an intermediate risk factor.
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Affiliation(s)
- Nury N. Olaya-Galán
- PhD Program in Biomedical and Biological Sciences, Universidad del Rosario, Bogotá, Colombia
- Grupo de Enfermedades Infecciosas, Laboratorio de Virología, Departamento de Microbiología, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Sandra P. Salas-Cárdenas
- Grupo de Enfermedades Infecciosas, Laboratorio de Virología, Departamento de Microbiología, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Jorge L. Rodriguez-Sarmiento
- Department of Pathology, Hospital Universitario San Ignacio - Pontificia Universidad Javeriana, Bogotá, Colombia
| | | | - Ricardo Monroy
- Hospital Universitario Mayor Méderi – Universidad del Rosario, Bogotá, Colombia
| | - Adriana P. Corredor-Figueroa
- Grupo de Enfermedades Infecciosas, Laboratorio de Virología, Departamento de Microbiología, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Wilson Rubiano
- Hospital Universitario Mayor Méderi – Universidad del Rosario, Bogotá, Colombia
| | - Jairo de la Peña
- Hospital Universitario Mayor Méderi – Universidad del Rosario, Bogotá, Colombia
| | - HuaMin Shen
- School of Public Health, University of California, Berkeley, California, United States of America
| | - Gertrude C. Buehring
- School of Public Health, University of California, Berkeley, California, United States of America
| | - Manuel A. Patarroyo
- Molecular Biology and Immunology Department, Fundación Instituto de Inmunología de Colombia (FIDIC), Bogotá, Colombia
- Microbiology Department, Faculty of Medicine, Universidad Nacional de Colombia, Bogotá, Colombia
- Health Sciences Division, Main Campus, Universidad Santo Tomás, Bogotá, Colombia
| | - Maria F. Gutierrez
- Grupo de Enfermedades Infecciosas, Laboratorio de Virología, Departamento de Microbiología, Pontificia Universidad Javeriana, Bogotá, Colombia
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Stobnicka-Kupiec A, Gołofit-Szymczak M, Górny RL, Cyprowski M. Prevalence of Bovine Leukemia Virus (BLV) and Bovine Adenovirus (BAdV) genomes among air and surface samples in dairy production. J Occup Environ Hyg 2020; 17:312-323. [PMID: 32255403 DOI: 10.1080/15459624.2020.1742914] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We aimed to assess the occurrence of bovine viruses (bovine leukemia virus-BLV and bovine adenovirus-BAdV) at workplaces in traditional dairies and to evaluate the potential role of airborne and surface contamination in spreading of these viruses derived from raw milk. The total amount of 122 samples-including 37 air (bioaerosol), 40 surface, and 45 milk samples-were checked for the presence of BLV and BAdV genomes using RT-qPCR/qPCR method. The study showed that the viruses were present in 7 air (among them 71.4% were BLV-positive and 28.6% were BAdV-positive), 14 surface (among them 85.7% were BLV-positive and 14.3% were BAdV-positive), and 34 milk (all were BLV-positive only) samples. Statistical analysis revealed that both the air and surfaces in studied occupational environment were more frequently contaminated with BLV than with BAdV (Chi-square test: p = 0.002, Fisher's Exact test: p = 0.002). Kruskal-Wallis tests showed significant differences in BLV genome concentrations in the air (p = 0.045) as well as in BLV and BAdV genome concentrations on surfaces (p = 0.005 and p = 0.040, respectively) between studied processing areas. In units of genome copies (gc) per area, the highest concentrations of BLV and BAdV genomes in the air (9.8 × 101 ± 1.14 × 102 gc/m3 and 5.4 × 101 ± 9.1 × 101 gc/m3, respectively) and on surfaces (9.83 × 102 ± 7.41 × 102 gc/100cm2 and 2.30 × 102 ± 3.8 × 102 gc/100cm2, respectively) were observed in milk reception area. The air and surfaces of pre-production zones were also significantly more contaminated with BAdV genomes compared to production areas (Mann-Whitney test: p = 0.039 and p = 0.029, respectively). This study showed that dairy workers may be exposed to bovine viruses through the inhalation of bioaerosols and contact with contaminated surfaces. To reduce the probability of virus transmission from the raw milk to humans, efficient surface cleaning procedures degrading viral particles should be introduced and the use of personal protection equipment, especially within pre-production zones, should be required. As the raw milk may be a source of bovine viruses, the development of strategies for both the control and eradication of BLV and BAdV among cattle seems to be also urgently needed.
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Affiliation(s)
| | | | - Rafał L Górny
- Central Institute for Labour Protection - National Research Institute, Warsaw, Poland
| | - Marcin Cyprowski
- Central Institute for Labour Protection - National Research Institute, Warsaw, Poland
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Saito S, Kitamura-Muramatsu Y, Komine F, Polat M, Takeshima SN, Takei M, Aida Y. Absence of bovine leukemia virus proviral DNA in Japanese human blood cell lines and human cancer cell lines. Arch Virol 2019; 165:207-214. [PMID: 31776677 DOI: 10.1007/s00705-019-04474-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 10/19/2019] [Indexed: 12/26/2022]
Abstract
Bovine leukemia virus (BLV) infects cattle worldwide and causes B-cell lymphoma in cattle. BLV has been identified in human breast and lung cancer and in blood, but the association of BLV and human cancer is controversial. In this study, we investigated the existence of BLV in 145 Japanese human blood cell lines and 54 human cancer cell lines, using a new highly sensitive PCR assay that can amplify even one copy of BLV using LTR primers different from those in previous studies on BLV provirus in breast cancer. All samples were found negative for BLV provirus, suggesting that BLV is unlikely to infect humans.
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Affiliation(s)
- Susumu Saito
- RIKEN GENESIS CO., LTD, Life Innovation Center 3F, 3-25-22 Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa, 210-0821, Japan
- Viral Infectious Diseases Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
- Photonics Control Technology Team, RIKEN Center for Advanced Photonics, Wako, Saitama, Japan
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, 30-1 Oyaguchi Kami-cho, Itabashi-ku, Tokyo, 173-8610, Japan
| | - Yuri Kitamura-Muramatsu
- RIKEN GENESIS CO., LTD, Life Innovation Center 3F, 3-25-22 Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa, 210-0821, Japan
| | - Fumiko Komine
- RIKEN GENESIS CO., LTD, Life Innovation Center 3F, 3-25-22 Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa, 210-0821, Japan
| | - Meripet Polat
- Viral Infectious Diseases Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
- Nakamura Laboratory, Baton Zone Program, RIKEN Cluster for Science, Technology and Innovation Hub, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
| | - Shin-Nosuke Takeshima
- Viral Infectious Diseases Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
- Photonics Control Technology Team, RIKEN Center for Advanced Photonics, Wako, Saitama, Japan
- Department of Food and Nutrition, Faculty of Human Life, Jumonji University, 2-1-28 Sugasawa, Niiza, Saitama, 352-0017, Japan
| | - Masami Takei
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, 30-1 Oyaguchi Kami-cho, Itabashi-ku, Tokyo, 173-8610, Japan
| | - Yoko Aida
- Viral Infectious Diseases Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
- Nakamura Laboratory, Baton Zone Program, RIKEN Cluster for Science, Technology and Innovation Hub, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
- Division of Hematology and Rheumatology, Department of Medicine, Nihon University School of Medicine, 30-1 Oyaguchi Kami-cho, Itabashi-ku, Tokyo, 173-8610, Japan.
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Khalilian M, Hosseini SM, Madadgar O. Bovine leukemia virus detected in the breast tissue and blood of Iranian women. Microb Pathog 2019; 135:103566. [PMID: 31252065 DOI: 10.1016/j.micpath.2019.103566] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 05/30/2019] [Accepted: 05/31/2019] [Indexed: 11/19/2022]
Abstract
BACKGROUND Breast cancer is one of the most common cancers in the world particularly among Iranian women. Bovine leukemia virus (BLV) is an enzootic, exogenous, and oncogenic retrovirus that causes B-cell leukosis in 1-5% of infected cattle. The current study aimed at evaluating the correlation between BLV infection and breast cancer in an Iranian population. MATERIALS AND TECHNIQUES A total of 400 samples including 200 breast cancer-suspected tissue samples and 200 blood samples of women without breast cancer, were collected from July 2017 to October 2018 from women referred to two general hospitals in Qom Province, Iran. The nested PCR technique was performed to determine the presence of tax and gag gene of BLV in the collected samples. RESULTS Out of 200 breast cancer-suspected tissue samples, 172 samples were malignant in terms of pathology. Other samples were reported as non-malignant and non-tumor. Based on nested PCR technique, tax and gag genes of BLV were detected in 30% and 8% of breast cancer-suspected tissue samples, respectively. The frequency of BLV in blood samples collected from women without breast cancer was 16.5% (33/200). CONCLUSION It seems that human breast cancer and BLV infection in cattle could be associated using nested PCR technique.
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Affiliation(s)
- Mohaddeseh Khalilian
- Department of Microbiology and Microbial Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Seyed Masoud Hosseini
- Department of Microbiology and Microbial Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran.
| | - Omid Madadgar
- Department of Microbiology, Faculty of Veterinary Medicine, University of Tehran, Iran; Department of Microbiology & Molecular Genetics, Michigan State University, East Lansing, MI, USA
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Serroni A, Forti K, De Giuseppe A. Role of conserved cysteine residues in the CAIC motif of the SU glycoprotein in the maturation and fusion activity of bovine leukaemia virus. Arch Virol 2019; 164:2309-2314. [PMID: 31172288 DOI: 10.1007/s00705-019-04294-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 04/29/2019] [Indexed: 11/26/2022]
Abstract
The surface (SU) and transmembrane (TM) glycoproteins of many retroviruses are linked by disulphide bonds, and the interaction of SU with a cellular receptor results in disulphide bond isomerisation triggered by the CXXC motif in SU. This reaction leads to the fusion of viral and host cell membranes. In this work, we show that the cysteine at amino acid position 212 in the CAIC motif of the SU glycoprotein of bovine leukaemia virus has a free thiol group. A C-to-A mutation at position 212, either individually or in combination with a C-to-A mutation at position 215, was found to inhibit the maturation process, suggesting its involvement in the formation of the covalent bond with TM.
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Affiliation(s)
- Anna Serroni
- Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche "Togo Rosati", Perugia, Italy
| | - Katia Forti
- Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche "Togo Rosati", Perugia, Italy.
| | - Antonio De Giuseppe
- Istituto Zooprofilattico Sperimentale dell'Umbria e delle Marche "Togo Rosati", Perugia, Italy
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Buehring GC, DeLaney A, Shen H, Chu DL, Razavian N, Schwartz DA, Demkovich ZR, Bates MN. Bovine leukemia virus discovered in human blood. BMC Infect Dis 2019; 19:297. [PMID: 30940091 PMCID: PMC6444872 DOI: 10.1186/s12879-019-3891-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 03/07/2019] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Bovine leukemia virus (BLV) infection is widespread in cattle globally and is present in marketed beef and dairy products. Human infection with BLV has been reported in breast and lung cancer tissues and was significantly associated with breast cancer in 3 case-control studies. The purpose of this current research was to determine if BLV is present in human blood cells and if antibodies to BLV are related to blood cell infection. METHODS Standard liquid PCR and Sanger DNA sequencing were used to test for BLV in buffy coat cells (leukocytes and platelets) of blood specimens from 95 self-selected female subjects. Enzyme-linked immunosorbent assay (ELISA) for IgG, IgM, and IgA was used to detect antibodies to BLV in the plasma of the corresponding blood samples. RESULTS BLV DNA was detected in the buffy coat cells of blood in 33/95 (38%) of the subjects by PCR and DNA sequencing. IgG antibodies were detected in 30/95(32%), IgM in 55/95(58%), and IgA in 30/95(32%) of the subjects. There was no significant correlation between presence of the antibodies and presence of BLV DNA. CONCLUSIONS This first report of BLV in human blood raises the question of whether infection of leukocytes could conceivably lead to leukemia as it does in infected cattle. Also, system wide circulation of infected blood cells could facilitate BLV transit to various internal tissues/organs with potential for their infection and subsequent development of cancer. The most likely route of BLV transmission to humans would be zoonotic, as a foodborne infection. Although eradicated from cattle in some countries, BLV still has a high rate of infection in the Americas, the Middle East, and parts of Europe and Asia. This report of BLV in the blood layer containing human leukocytes/platelets adds important information which could be useful to elucidate possible routes of transmission of BLV to humans and to prevent further human infection.
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Affiliation(s)
- Gertrude C. Buehring
- School of Public Health, University of California, 16 Barker Hall, Berkeley, CA 94720-7354 USA
| | - Anne DeLaney
- Kaiser Permanente Medical Cente, San Rafael, CA USA
| | - HuaMin Shen
- School of Public Health, University of California, 16 Barker Hall, Berkeley, CA 94720-7354 USA
| | - David L. Chu
- Oakland University William Beaumont School of Medicine, Oakland, MI USA
| | - Niema Razavian
- University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Daniel A. Schwartz
- Joint Medical Program, University of California, Berkeley, CA USA
- University of California, San Francisco, CA USA
| | | | - Michael N. Bates
- School of Public Health, University of California, 16 Barker Hall, Berkeley, CA 94720-7354 USA
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10
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Schwingel D, Andreolla AP, Erpen LMS, Frandoloso R, Kreutz LC. Bovine leukemia virus DNA associated with breast cancer in women from South Brazil. Sci Rep 2019; 9:2949. [PMID: 30814631 PMCID: PMC6393560 DOI: 10.1038/s41598-019-39834-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2018] [Accepted: 01/23/2019] [Indexed: 01/23/2023] Open
Abstract
Breast cancer is a neoplastic condition with a high morbidity and mortality amongst women worldwide. Recent data linking bovine leukemia virus (BLV) with breast cancer has been contested already. Our study investigated the presence of BLV genome in healthy (n = 72) and cancerous (n = 72) paraffin-embedded samples of breast tissues from women in south Brazil. BLV DNA was found most frequently (30.5%) in breast cancer tissue than in healthy breast (13.9%) (Odds ratio = 2.73; confidence interval = 1.18-6.29; p = 0.027). In contrast, antibodies to BLV were found in a very small percentage of healthy blood donors. There was no association between BLV DNA and other tumor prognostic biological markers such as hormonal receptors, HER2 oncoprotein, proliferation index, metastasis in sentinels lymph nodes, and tumor grade and size. Our findings suggest that BLV should be considered a potential predisposing factor to breast cancer in women.
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Affiliation(s)
- Daniela Schwingel
- Universidade de Passo Fundo, Laboratório de Microbiologia e Imunologia Avançada, Prédio G3. Campus I, Bairro São José, BR 285, Km 292, 99052-900, Passo Fundo, RS, Brazil
| | - Ana P Andreolla
- Universidade de Passo Fundo, Laboratório de Microbiologia e Imunologia Avançada, Prédio G3. Campus I, Bairro São José, BR 285, Km 292, 99052-900, Passo Fundo, RS, Brazil
| | - Luana M S Erpen
- Universidade de Passo Fundo, Laboratório de Microbiologia e Imunologia Avançada, Prédio G3. Campus I, Bairro São José, BR 285, Km 292, 99052-900, Passo Fundo, RS, Brazil
| | - Rafael Frandoloso
- Universidade de Passo Fundo, Laboratório de Microbiologia e Imunologia Avançada, Prédio G3. Campus I, Bairro São José, BR 285, Km 292, 99052-900, Passo Fundo, RS, Brazil
| | - Luiz C Kreutz
- Universidade de Passo Fundo, Laboratório de Microbiologia e Imunologia Avançada, Prédio G3. Campus I, Bairro São José, BR 285, Km 292, 99052-900, Passo Fundo, RS, Brazil.
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11
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Saushkin NY, Samsonova JV, Osipov AP, Kondakov SE. Strip-dried blood sampling: applicability for bovine leukemia virus detection with ELISA and real-time PCR. J Virol Methods 2018; 263:101-104. [PMID: 30412721 DOI: 10.1016/j.jviromet.2018.11.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 10/23/2018] [Accepted: 11/05/2018] [Indexed: 11/18/2022]
Abstract
We recently proposed a new so-called strip-dried format aimed for convenient use of dried biomaterial in diagnostic purposes. In this work, 334 blood samples obtained in strip-dried form were used for bovine leucosis analysis with ELISA and real-time PCR methods. High percentage of seropositive animals (18.3%) let us estimate both indirect (serological) and direct methods applicability for the analysis of strip-dried blood samples and also to compare them (PCR results concurred with ELISA in 93.4% cases). Parallel analysis of native and corresponding strip-dried samples approved the proposed format as a reliable analytical way of sampling being in 100% concordance with conventional serum/whole blood ELISA and PCR analysis. Even distribution of antibodies against bovine leukemia virus along the membrane carrier was demonstrated by square-to-square analyzing of the sample strip (CV not exceeded 7%). Also, strip-dried blood samples showed enhanced stability at elevated temperatures comparing to liquid serum. The proposed strip-blood format is a promising way of sampling, storage and transportation and can find application in veterinary practice for infectious disease monitoring.
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Affiliation(s)
- Nikolay Yu Saushkin
- Faculty of Chemistry, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia.
| | - Jeanne V Samsonova
- Faculty of Chemistry, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia; National University of Science and Technology "MISiS", 119049, Moscow, Russia
| | - Alexander P Osipov
- Faculty of Chemistry, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia; National University of Science and Technology "MISiS", 119049, Moscow, Russia
| | - Sergey E Kondakov
- Faculty of Chemistry, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia; National University of Science and Technology "MISiS", 119049, Moscow, Russia
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12
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Gillet NA, Willems L. Whole genome sequencing of 51 breast cancers reveals that tumors are devoid of bovine leukemia virus DNA. Retrovirology 2016; 13:75. [PMID: 27814725 PMCID: PMC5095936 DOI: 10.1186/s12977-016-0308-3] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 10/18/2016] [Indexed: 11/30/2022] Open
Abstract
Controversy exists regarding the association of bovine leukemia virus (BLV) and breast cancer. PCR-based experimental evidence indicates that BLV DNA is present in breast tissue and that as many as 37% of cancer cases may be attributable to viral exposure. Since this association might have major consequences for human health, we evaluated 51 whole genomes of breast cancer samples for the presence of BLV DNA. Among 32 billion sequencing reads retrieved from the NCBI database of genotype and phenotype, none mapped on different strains of the BLV genome. Controls for sequence divergence and proviral loads further validated the approach. This unbiased analysis thus excludes a clonal insertion of BLV in breast tumor cells and strongly argues against an association between BLV and breast cancer.
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Affiliation(s)
- Nicolas A Gillet
- Molecular and Cellular Epigenetics, Interdisciplinary Cluster for Applied Genoproteomics (GIGA), University of Liège (ULg), B34, 1 Avenue de l'Hôpital, 4000, Sart-Tilman Liège, Belgium.
- Molecular and Cellular Biology, Gembloux Agro-Bio TechUniversity of Liège (ULg), 13 Avenue Maréchal Juin, 5030, Gembloux, Belgium.
| | - Luc Willems
- Molecular and Cellular Epigenetics, Interdisciplinary Cluster for Applied Genoproteomics (GIGA), University of Liège (ULg), B34, 1 Avenue de l'Hôpital, 4000, Sart-Tilman Liège, Belgium.
- Molecular and Cellular Biology, Gembloux Agro-Bio TechUniversity of Liège (ULg), 13 Avenue Maréchal Juin, 5030, Gembloux, Belgium.
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13
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Abstract
A polymerase chain reaction (PCR)-based detection system was established to identify the presence of bovine leukosis virus (BLV) DNA in bovine semen. Seventy-nine bulls were included in the study. Serum, peripheral blood leukocytes, and semen were collected from each of the 79 bulls. The BLV-specific antibody was detected in serum by agar gel immunodiffusion and viral DNA in blood and semen by PCR. Serologically, 29 of the 79 bulls were BLV positive. Twenty-seven of the 29 seropositive bulls and 1 of the seronegative bulls had BLV DNA in peripheral blood leukocytes. All 79 bulls tested PCR negative for the presence of BLV in semen. This data is strong evidence that properly collected semen from BLV seropositive bulls will not contribute to dissemination of this viral infection.
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Khudhair YI, Hasso SA, Yaseen NY, Al-Shammari AM. Serological and molecular detection of bovine leukemia virus in cattle in Iraq. Emerg Microbes Infect 2016; 5:e56. [PMID: 27273225 PMCID: PMC4932651 DOI: 10.1038/emi.2016.60] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 02/07/2016] [Accepted: 03/07/2016] [Indexed: 02/04/2023]
Abstract
Bovine leukemia virus (BLV) is highly endemic in many countries, including Iraq, and it impacts the beef and dairy industries. The current study sought to determine the percentage of BLV infection and persistent lymphocytosis (PL) in cattle in central Iraq. Hematological, serological, and molecular observations in cross breeds and local breeds of Iraqi cattle naturally infected with BLV were conducted in the peripheral blood mononuclear cells of 400 cattle (340 cross breed and 60 local breed) using enzyme-linked immunosorbent assay and polymerase chain reaction (PCR). On the basis of the absolute number of lymphocytes, five of the 31 positive PCR cases had PL. Among these leukemic cattle, one case exhibited overt neutrophilia. Serum samples were used to detect BLV antibodies, which were observed in 28 (7%) samples. PCR detected BLV provirus in 31 samples (7.75%). All 28 of the seropositive samples and the 3 seronegative samples were positive using PCR. Associations were observed between bovine leukosis and cattle breed, age and sex. Age-specific analysis showed that the BLV percentage increased with age in both breeds. Female cattle (29 animals; 7.34%) exhibited significantly higher infectivity than male cattle (two animals; 4.34%). In conclusion, comprehensive screening for all affected animals is needed in Iraq; programs that segregate cattle can be an effective and important method to control and/or eliminate the BLV.
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Affiliation(s)
- Yahia Ismail Khudhair
- Department of Veterinary Medicine, College of Veterinary Medicine, Al-University of Qadisiyah, Al Diwaniyah 58002, Iraq
| | - Saleem Amin Hasso
- Department of Veterinary Medicine, College of Veterinary Medicine, University of Baghdad, Baghdad 10001, Iraq
| | - Nahi Y Yaseen
- Experimental Therapy Department, Iraqi Center for Cancer and Medical Genetic Research, Mustansiriyah University, Baghdad 10001, Iraq
| | - Ahmed Majeed Al-Shammari
- Experimental Therapy Department, Iraqi Center for Cancer and Medical Genetic Research, Mustansiriyah University, Baghdad 10001, Iraq
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15
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16
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Buehring GC, Shen HM, Jensen HM, Jin DL, Hudes M, Block G. Exposure to Bovine Leukemia Virus Is Associated with Breast Cancer: A Case-Control Study. PLoS One 2015; 10:e0134304. [PMID: 26332838 PMCID: PMC4557937 DOI: 10.1371/journal.pone.0134304] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 07/07/2015] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND Age, reproductive history, hormones, genetics, and lifestyle are known risk factors for breast cancer, but the agents that initiate cellular changes from normal to malignant are not understood. We previously detected bovine leukemia virus (BLV), a common oncogenic virus of cattle, in the breast epithelium of humans. The objective of this study was to determine whether the presence of BLV DNA in human mammary epithelium is associated with breast cancer. METHODS This was a case-control study of archival formalin fixed paraffin embedded breast tissues from 239 donors, received 2002-2008 from the Cooperative Human Tissue Network. Case definition as breast cancer versus normal (women with no history of breast cancer) was established through medical records and examination of tissues by an anatomical pathologist. Breast exposure to BLV was determined by in situ-PCR detection of a biomarker, BLV DNA, localized within mammary epithelium. RESULTS The frequency of BLV DNA in mammary epithelium from women with breast cancer (59%) was significantly higher than in normal controls (29%) (multiply- adjusted odds ratio = 3.07, confidence interval = 1.66-5.69, p = .0004, attributable risk = 37%). In women with premalignant breast changes the frequency of BLV DNA was intermediate (38%) between that of women with breast cancer and normal controls (p for trend < .001). CONCLUSIONS Among the specimens in this study, the presence of amplified BLV DNA was significantly associated with breast cancer. The odds ratio magnitude was comparable to those of well-established breast cancer risk factors related to reproductive history, hormones, and lifestyle and was exceeded only by risk factors related to genetics (familial breast cancer), high dose ionizing radiation, and age. These findings have the potential for primary and secondary prevention of breast cancer.
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Affiliation(s)
- Gertrude Case Buehring
- Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, California, United States of America
- * E-mail:
| | - Hua Min Shen
- Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, California, United States of America
| | - Hanne M. Jensen
- Department of Pathology and Laboratory Medicine, University of California, Davis Medical Center, Sacramento, California, United States of America
| | - Diana L. Jin
- Division of Infectious Diseases and Vaccinology, School of Public Health, University of California, Berkeley, California, United States of America
| | - Mark Hudes
- Atkins Center for Weight and Health, University of California, Berkeley, California, United States of America
| | - Gladys Block
- Division of Community Health and Human Development, School of Public Health, University of California, Berkeley, California, United States of America
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Ohno A, Takeshima SN, Matsumoto Y, Aida Y. Risk factors associated with increased bovine leukemia virus proviral load in infected cattle in Japan from 2012 to 2014. Virus Res 2015; 210:283-90. [PMID: 26321160 DOI: 10.1016/j.virusres.2015.08.020] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 08/22/2015] [Accepted: 08/24/2015] [Indexed: 11/17/2022]
Abstract
Bovine leukemia virus (BLV) is the causative agent of enzootic bovine leukosis, a malignant B cell lymphoma. BLV has spread worldwide and causes serious problems. After infection, the BLV genome is integrated into the host DNA and can be amplified during periods of latency. We previously designed degenerate primers using the Coordination of Common Motifs (CoCoMo) algorithm to establish a new quantitative real-time PCR method (BLV-CoCoMo-qPCR-2) of measuring the proviral load of both known and novel BLV variants. Here, we aimed to examine the correlation between proviral load and risk factors for BLV infection, such as breeding systems, parousity, and colostrum feeding. Blood and serum samples were collected from 83 BLV-positive farms in 22 prefectures of Japan, and the BLV proviral load and anti-BLV antibody levels were measured. BLV was detected in 73.3% (1039/1,417) of cattle by BLV-CoCoMo-qPCR-2 and the provirus was detected in 93 of 1039 antibody-negative samples. The results showed that the proviral load increased with progression of lymphocytosis. Next, the risk factors associated with increasing BLV infection rate were examined along with any association with proviral load. The proviral load was higher in cattle with lymphocytosis than in healthy cattle, and higher in multiparous cows than in nulliparous cows. Finally, proviral loads were higher in contact breeding systems than in non-contact breeding systems. Taken together, these findings may help to formulate a plan for eliminating BLV from contaminated farms. This is the first nationwide study to estimate BLV proviral load in Japanese cattle.
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Affiliation(s)
- Ayumu Ohno
- Viral Infectious Diseases Unit, RIKEN, 2-1Hirosawa, Wako, Saitama 351-0198, Japan
| | | | - Yuki Matsumoto
- Viral Infectious Diseases Unit, RIKEN, 2-1Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yoko Aida
- Viral Infectious Diseases Unit, RIKEN, 2-1Hirosawa, Wako, Saitama 351-0198, Japan.
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18
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Ruzina MN, Andrianov BV, Suprovich TM, Sulimova GE. [Specific genetic features of the Russian forms of bovine leukemia virus]. Genetika 2013; 49:975-980. [PMID: 25474884 DOI: 10.7868/s0016675813080134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Genetic peculiarities of bovine leukemia virus isolates (BLV) spread throughout Russia and Ukraine (BLV-1, BLV-2, and BLV-4) have been characterized based on pol gene polymorphism. Seven viral forms have been detected. The variability of BLV isolates did not exceed 1% within one form. Despite the recent inhabitation of BLV in Russia in the middle of 20th century, Russian BLV variants are characterized by several specific nucleotide substitutions. Point mutations that result in the changes in the aminoacid sequence of reverse transcriptase of BLV specific to distinct viral forms were observed. C --> G transition at the 2752 position (relatively to the reference genome AF033818), which results in the substitution of glutamic to asparaginic acid (GAG --> GAC), is specific to form BLV-2. This mutation was demonstrated in BLV isolates from Ukraine. The T --> G substitution at the 2758 position, which results in the substitution of isoleucine for methionine (ATT --> ATG), is specific to BLV-4 and BLV-7 forms. The BLV-4 form was only detected in Russia and Ukraine. The present study also includes a review of the published data concerning BLV variability. The existing classifications of BLV forms have been critically conceived and the new optimal classification of BLV forms with the maximal resolution has been suggested.
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19
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Rola-Łuszczak M, Pluta A, Olech M, Donnik I, Petropavlovskiy M, Gerilovych A, Vinogradova I, Choudhury B, Kuźmak J. The molecular characterization of bovine leukaemia virus isolates from Eastern Europe and Siberia and its impact on phylogeny. PLoS One 2013; 8:e58705. [PMID: 23527009 PMCID: PMC3602460 DOI: 10.1371/journal.pone.0058705] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 02/05/2013] [Indexed: 01/01/2023] Open
Abstract
Recent studies have shown that bovine leukemia virus (BLV) sequences can be classified into seven distinct genotypes based on full gp51 sequence. This classification was based on available sequence data that mainly represented the BLV population that is circulating in cattle from the US and South America. In order to aid with a global perspective inclusion of data from Eastern Europe is required. In this study we examined 44 BLV isolates from different geographical regions of Poland, Belarus, Ukraine, and Russia. Phylogenetic analysis based on a 444bp fragment of env gene revealed that most of isolates belonged to genotypes 4 and 7. Furthermore, we confirmed the existence of a new genotype, genotype 8, which was highly supported by phylogenetic computations. A significant number of amino acid substitutions were found in the sequences of the studied Eastern European isolates, of which 71% have not been described previously. The substitutions encompassed mainly the C-part of the CD4+ epitope, zinc binding peptide region, CD8+ T cell epitope, and overlapping linear epitope E. These observations highlight the use of sequence data to both elucidate phylogenetic relationships and the potential effect on serological detection of geographically diverse isolates.
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20
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Ruzina MN, Andrianov BV, Shaĭkhaev GO, Sulimova GE. [Identification and classification of bovine leukemia virus isolates in Russia and Ukraine based on the pol viral gene polymorphism]. Genetika 2012; 48:855-862. [PMID: 22988771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Bovine leukemia virus (BLV) is a widespread specific pathogen of cattle. Analysis of the pol viral gene polymorphism has been used to characterize the polymorphism of BLV isolates at stock-breeding farms in Russia and Ukraine. The fragments of the pol gene corresponding to the reverse transcriptase and integrase 494 and 233 bp in size, respectively, have been used for analysis. Phylogenetic analysis has revealed several variants of BLV clustered with a high bootstrap support in Russia and Ukraine. A new classification of BLV variants is suggested. Comparison of phylograms based on the polymorphism of the nucleotide sequences of the integrase and reverse transcriptase domains did not show topological conflicts. Therefore, recombination between BLV variants has not been found.
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21
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Lee LC, Scarratt WK, Buehring GC, Saunders GK. Bovine leukemia virus infection in a juvenile alpaca with multicentric lymphoma. Can Vet J 2012; 53:283-286. [PMID: 22942445 PMCID: PMC3280782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A 13-month-old alpaca (Vicugna pacos) was presented for mandibular masses and weight loss. Histopathology of biopsy tissue was consistent with lymphoma. The alpaca was euthanized and necropsy revealed lymphoma masses in multiple organs. Immunohistochemistry for T- and B-cell typing was inconclusive. Serology and in-situ polymerase chain reaction hybridization were positive for bovine leukemia virus.
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Affiliation(s)
- Laura C Lee
- The Agnes Banks Equine Clinic, 5 Price Lane, Agnes Banks, NSW, 2753, Australia.
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22
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Rodríguez SM, Florins A, Gillet N, de Brogniez A, Sánchez-Alcaraz MT, Boxus M, Boulanger F, Gutiérrez G, Trono K, Alvarez I, Vagnoni L, Willems L. Preventive and therapeutic strategies for bovine leukemia virus: lessons for HTLV. Viruses 2011; 3:1210-48. [PMID: 21994777 PMCID: PMC3185795 DOI: 10.3390/v3071210] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2011] [Revised: 06/28/2011] [Accepted: 06/29/2011] [Indexed: 01/06/2023] Open
Abstract
Bovine leukemia virus (BLV) is a retrovirus closely related to the human T-lymphotropic virus type 1 (HTLV-1). BLV is a major animal health problem worldwide causing important economic losses. A series of attempts were developed to reduce prevalence, chiefly by eradication of infected cattle, segregation of BLV-free animals and vaccination. Although having been instrumental in regions such as the EU, these strategies were unsuccessful elsewhere mainly due to economic costs, management restrictions and lack of an efficient vaccine. This review, which summarizes the different attempts previously developed to decrease seroprevalence of BLV, may be informative for management of HTLV-1 infection. We also propose a new approach based on competitive infection with virus deletants aiming at reducing proviral loads.
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Affiliation(s)
- Sabrina M. Rodríguez
- Molecular and Cellular Epigenetics, Interdisciplinary Cluster for Applied Genoproteomics (GIGA), University of Liège (ULg), 4000, Liège, Belgium; E-Mails: (S.M.R.); (N.G.); (F.B.)
| | - Arnaud Florins
- Molecular and Cellular Biology, Gembloux Agro-Bio Tech, University of Liège (ULg), 5030, Gembloux, Belgium; E-Mails: (A.F.); (A.d.B.); (M.T.S.-A.); (M.B.)
| | - Nicolas Gillet
- Molecular and Cellular Epigenetics, Interdisciplinary Cluster for Applied Genoproteomics (GIGA), University of Liège (ULg), 4000, Liège, Belgium; E-Mails: (S.M.R.); (N.G.); (F.B.)
| | - Alix de Brogniez
- Molecular and Cellular Biology, Gembloux Agro-Bio Tech, University of Liège (ULg), 5030, Gembloux, Belgium; E-Mails: (A.F.); (A.d.B.); (M.T.S.-A.); (M.B.)
| | - María Teresa Sánchez-Alcaraz
- Molecular and Cellular Biology, Gembloux Agro-Bio Tech, University of Liège (ULg), 5030, Gembloux, Belgium; E-Mails: (A.F.); (A.d.B.); (M.T.S.-A.); (M.B.)
| | - Mathieu Boxus
- Molecular and Cellular Biology, Gembloux Agro-Bio Tech, University of Liège (ULg), 5030, Gembloux, Belgium; E-Mails: (A.F.); (A.d.B.); (M.T.S.-A.); (M.B.)
| | - Fanny Boulanger
- Molecular and Cellular Epigenetics, Interdisciplinary Cluster for Applied Genoproteomics (GIGA), University of Liège (ULg), 4000, Liège, Belgium; E-Mails: (S.M.R.); (N.G.); (F.B.)
| | - Gerónimo Gutiérrez
- Instituto de Virología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, INTA, C.C. 1712, Castelar, Argentina; E-Mails: (G.G.); (K.T.); (I.A.); (L.V.)
| | - Karina Trono
- Instituto de Virología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, INTA, C.C. 1712, Castelar, Argentina; E-Mails: (G.G.); (K.T.); (I.A.); (L.V.)
| | - Irene Alvarez
- Instituto de Virología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, INTA, C.C. 1712, Castelar, Argentina; E-Mails: (G.G.); (K.T.); (I.A.); (L.V.)
| | - Lucas Vagnoni
- Instituto de Virología, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas, INTA, C.C. 1712, Castelar, Argentina; E-Mails: (G.G.); (K.T.); (I.A.); (L.V.)
| | - Luc Willems
- Molecular and Cellular Epigenetics, Interdisciplinary Cluster for Applied Genoproteomics (GIGA), University of Liège (ULg), 4000, Liège, Belgium; E-Mails: (S.M.R.); (N.G.); (F.B.)
- Molecular and Cellular Biology, Gembloux Agro-Bio Tech, University of Liège (ULg), 5030, Gembloux, Belgium; E-Mails: (A.F.); (A.d.B.); (M.T.S.-A.); (M.B.)
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Inoue E, Matsumura K, Maekawa K, Nagatsuka K, Nobuta M, Hirata M, Minagawa A, Osawa Y, Okazaki K. Genetic heterogeneity among bovine leukemia viruses in Japan and their relationship to leukemogenicity. Arch Virol 2011; 156:1137-41. [PMID: 21387204 DOI: 10.1007/s00705-011-0955-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Accepted: 02/18/2011] [Indexed: 10/18/2022]
Abstract
Bovine leukemia virus (BLV) infection in cattle causes persistent lymphocytosis, and a few percent of infected animals develop lymphoid tumors, namely enzootic bovine leukosis (EBL). In this study, a 440-bp fragment of the env gene was amplified from 204 tumor samples collected from different regions of Japan and analyzed by restriction fragment length polymorphism (RFLP) to determine the association of BLV with EBL. Of the seven RFLP types defined, types I, II, and III were dominant and found in 12.7, 75.0, and 8.3% of tumor samples, respectively. Cattle harboring type III virus were significantly older than other animals at the time of diagnosis of EBL. Type III viruses were found in approximately 33% and 5.5% of Japanese Black and Holstein cattle, respectively, with EBL. These findings indicate that genetically distinct BLV was associated with EBL in Japan and that the genetic profile may influence the leukemogenicity of the virus.
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Affiliation(s)
- Emi Inoue
- Department of Microbiology and Immunology, Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, 061-0293, Japan
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Ponomareva IS. [Biological cycle of radionuclides and dynamics of cattle leukemia in the Orenburg region]. Radiats Biol Radioecol 2008; 48:606-610. [PMID: 19004334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Global technogenic radionuclides pollution of environment, migration of radionuclides from soil into animal feeds stimulate additional contamination doses. Concentration of natural and of technogenic radionuclides in the investigated objects was determined as result of radiochemical and radiometric studies. It was established that maximum concentrations of 40K, 232Th, 226Ra (Bk/kg) radionuclides in the soil of the eastern zone was 391.6 +/- 77.64; 20.8 +/- 0.71; 16.7 +/- 0.8 (respectively) without exceeding permissable levels. It is also found that the density of soil pollution with 137Cs in the western zone is 0.28 +/- 0.075 mBk/m2 (76.8 +/- 20.4 mKi/km2), such soils are to be considered as locally polluted soils. The number of cattle infected with cattle leucosis is obviously higher in ecologically unsafe areas: 19.3% on the western farms, 12.95% in the central areas and 9.70% on the farms of the eastern zone. Long-term exposure to ecologically unsafe conditions may lead to the reduction of populations immune status expressed in lower disease resistance and in incidence of carcinogenic pathology.
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Teifke JP, Vahlenkamp TW. [Detection of bovine leukaemia virus (BLV) in tissue samples of naturally and experimentally infected cattle]. Berl Munch Tierarztl Wochenschr 2008; 121:263-269. [PMID: 18712262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Enzootic bovine leukaemia (EBL) which is caused by the bovine leukaemia virus (BLV) still plays a remarkable role despite a significant success in sanitation programmes. In the Federal Republic of Germany it was not possible to eradicate the disease until today. Sporadically during slaughter or necropsy of cattle neoplastic lesions of the lymphatic tissues are observed that need to be clarified with regard to BLV as etiological agent. Due to the fact that in most instances no serological data are available from the respective animals and blood drawings from the original holdings are not easy to obtain the polymerase chain reaction (PCR) opens new avenues as supplementary diagnostic tool to test unfixed lymphatic tissues for the presence of BLV proviral DNA. Lymph node tissues from 10 naturally or experimentally BLV-infected cattle, which have been monitored virologically and serologically, and tissues from 4 negative animals were processed, DNA was extracted and subjected to PCR to amplify BLV env gene specific sequences. The results show that in cattle with BLV-induced leukosis as well as in cattle, which were clinically healthy and unsuspicious at slaughter or at post-mortem, either with persistent lymphocytosis (PL) or without, BLV proviral DNA could be detected easily in samples of lymphatic tissues and in high concordance with serological data. In this article data from the National and OIE reference laboratory for EBL at the Friedrich-Loeffler-Institut (FLI, Germany) are presented. Elaborated laboratory protocols for processing of tissue samples and performing of BLV-PCR are recommended.
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Affiliation(s)
- Jens P Teifke
- Friedrich-Loeffler-Institut (FLI), Bundesforschungsinstitut für Tiergesundheit, Insel Riems
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Acaite J, Tamosiunas V, Lukauskas K, Milius J, Pieskus J. The eradication experience of enzootic bovine leukosis from Lithuania. Prev Vet Med 2007; 82:83-9. [PMID: 17640751 DOI: 10.1016/j.prevetmed.2007.05.010] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2004] [Revised: 05/11/2007] [Accepted: 05/15/2007] [Indexed: 11/26/2022]
Abstract
Before 1985 the situation regarding enzootic bovine leukosis (EBL) in Lithuanian cattle was described only haphazardly. In 1986 serological investigations were initiated together with an eradication programme. The EBL bovine leukosis virus (BLV) situation was monitored by the Institute of Immunology Vilnius University, national and regional veterinary laboratories. Starting in 1986 all EBL-positive cattle were separated from negative cattle into BLV-infected and BLV-free herds. To create the latter, calves were fed pasteurized milk. The seroprevalence in 1990 was 7.29%, but it steadily declined to 0.32% in 2006.
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Affiliation(s)
- J Acaite
- Institute of Immunology Vilnius University, Moletu pl 29, LT-08409 Vilnius-21, Lithuania
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27
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Camargos MF, Pereda A, Stancek D, Rocha MA, dos Reis JKP, Greiser-Wilke I, Leite RC. Molecular characterization of the env gene from Brazilian field isolates of Bovine Leukemia Virus. Virus Genes 2007; 34:343-50. [PMID: 16917740 DOI: 10.1007/s11262-006-0011-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2006] [Accepted: 04/27/2006] [Indexed: 11/24/2022]
Abstract
Molecular characterization of Bovine leukemia virus (BLV) isolates from Brazil using the env gene sequences revealed a high conservation of this gene. In most cases the substitutions corresponded to silent transitions. In addition, cystein residues, potential glycosylation sites, neutralization domains and other critical residues involved with the envelope structural domains and viral infectivity were conserved. Most of the substitutions found in the aminoacid sequences of the gp51 protein were localized in the G and H epitopes. Using the SIFT software, it was predicted that they should not alter the protein functions. Phylogenetic analyses showed that partial or complete env gene sequences grouped in three or four phylogenetic clusters, respectively. The sequences from the Brazilian isolates had similar mutation rates as compared to samples from other countries, and belonged to at least two phylogenetic clusters.
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Affiliation(s)
- Marcelo Fernandes Camargos
- Setor de Virologia do Laboratório Nacional Agropecuário de Minas Gerais, Av. Rômulo Joviano s/n Caixa Postal 50, Pedro Leopoldo, MG, Brasil CEP. 33.600-000.
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Abstract
Analysis of the partial bovine leukaemia virus (BLV) gp51 gene sequences obtained from five BLV strains isolated in different regions of Iran and BLV-FLK strain was carried out. The Iranian BLV gp51 sequences were compared with seven other corresponding sequences of BLV strains isolated in different countries. Nucleotide sequence analysis showed a variability of 0.003-5.1% and the phylogenetic tree constructed revealed three clusters. The first cluster included French, German and FLK-BLV samples; the second cluster included four Iranian samples; and the third cluster included Australian, Korean, Japanese, Brazilian and Belgian reference strains and one Iranian sample. Iranian samples were had significantly similarity to European and Australian samples.
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Affiliation(s)
- F Hemmatzadeh
- Department of Microbiology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.
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Zhao X, Jimenez C, Sentsui H, Buehring GC. Sequence polymorphisms in the long terminal repeat of bovine leukemia virus: evidence for selection pressures in regulatory sequences. Virus Res 2006; 124:113-24. [PMID: 17123656 DOI: 10.1016/j.virusres.2006.10.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Revised: 10/15/2006] [Accepted: 10/20/2006] [Indexed: 10/23/2022]
Abstract
Bovine leukemia virus (BLV) is an oncogenic virus widespread in cattle. It belongs to the genus Deltaretrovirus of the family Retroviridae along with human and simian T-lymphotropic viruses. The BLV transcriptional promoter is located in the proviral 5' long terminal repeat (LTR), composed of U3, R, and U5 regions. BLV LTR contains multiple cis-acting elements important for promoter activity, a short coding sequence (encoding the NH(2) terminus of the G4 regulatory protein), and non-regulatory/non-coding regions. Variation in coding sequences of BLV structural proteins has been studied extensively, but little work has been done on sequence variability of non-coding regions, mostly located in LTR. Here, we report the first study on the natural diversity of the BLV LTR, using viral isolates from 52 cattle in several different areas worldwide. Nucleotide variations from the consensus sequence were observed in most isolates and clustered phylogenetically, corresponding to the geographic distribution of donor cattle. Overall, regulatory regions were significantly more conserved than non-regulatory regions in the BLV LTR, as well as in LTR sub-regions (U3, R, and U5). Evidence of selection pressures in BLV LTR suggests that selection occurs not only in coding sequences, but may also involve regulatory sequences.
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Affiliation(s)
- Xiangrong Zhao
- Graduate Program in Endocrinology, University of California, Berkeley, CA 94720-3140, USA.
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30
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Abstract
To investigate the early establishment of bovine leukemia virus (BLV) infection, we injected BLV-infected or mock-infected allogeneic cells into the shoulder of sheep in which an efferent lymphatic duct of the draining prescapular lymph node had been cannulated. Rare mononuclear cells acting as centers of BLV infection in culture were present within 4 to 6 days in efferent lymph and within 6 to 10 days in blood. Soon after BLV injection, immunoglobulin M+ (IgM+) and CD8+ cells increased in efferent lymph and oscillated reciprocally in frequency. CD8+ blasts increased on days 4 to 6, when infectious centers increased 100-fold in lymph. On days 6 and 7, both lymph and blood were enriched with CD8+ cells that were labeled late on day 5 with an intravenous pulse of 5-bromo-2'-deoxyuridine (BrdU). Lymph, but not blood, was enriched with BrdU+ B cells on day 7. Capsid-specific antibodies became detectable in efferent lymph on days 6 to 8 and surface glycoprotein-specific antibodies on day 9, preceding their detection in serum by 9 to 14 days. Systemic dissemination of BLV-infected cells was thus accompanied by an increase in proliferating CD8+ cells and the onset of BLV-specific antibodies in lymph. Infectious centers reached maximum frequencies of 0.2% in lymph by days 11 to 13, and then their frequencies increased by 5- to 40-fold in blood cells, suggesting that many infected blood cells do not recirculate back into lymph. Beginning on days 10 to 13, a subpopulation of B cells having high levels of surface IgM increased sharply in peripheral blood. Such cells were not present in lymph. After a day 16 pulse of BrdU, recently proliferated cells that stained intensely for surface IgM appeared in blood within 15 h. Predominantly B lymphocytes contained the viral capsid protein when lymph and blood cells were cultured briefly to allow BLV expression. However, both early in lymph and later in blood, BrdU+ B cells greatly exceeded productively infected cells, indicating that new BLV infections stimulate proliferation of two different populations of B cells.
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Affiliation(s)
- B E Fulton
- Department of Animal Science, University of California, One Shields Ave., Davis, CA 95616-8521, USA
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31
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Dus Santos MJ, Trono K, Lager I, Wigdorovitz A. Development of a PCR to diagnose BLV genome in frozen semen samples. Vet Microbiol 2006; 119:10-8. [PMID: 17030101 DOI: 10.1016/j.vetmic.2006.08.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2006] [Revised: 08/29/2006] [Accepted: 08/31/2006] [Indexed: 10/24/2022]
Abstract
The sanitary and economic impact of BLV infection is associated with the interference in the international movement of cattle and their germ plasm. Although experimental data support the improbability that semen from BLV-positive bulls could infect recipient cows, restriction for commercialization of semen from infected animals is still present. The objective of this work was to standardize a PCR assay to diagnose the presence of BLV genome in frozen semen samples. The developed methodology involves the amplification of an internal fragment of gag gene. The limit of detection of this technique was six viral particles, using gag-PCR followed by hybridization analysis. Frozen semen samples from seropositive bulls were analyzed. It was possible to detect proviral DNA in 9 out of 173 samples. Additionally, a biological test in susceptible sheep was performed in order to evaluate the transmission of BLV genome by semen from seropositive animals. This data strongly suggest that semen from seropositive bulls that resulted negative by PCR can be used for artificial insemination (AI), accompanied by proper collection protocols. The development of this PCR assay constitutes a valuable diagnostic tool to determine the BLV-free status of frozen semen samples used for AI.
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Affiliation(s)
- María José Dus Santos
- Instituto de Virología S. Rivenson, CICVyA, INTA-Castelar, Hurlingham (1686), Buenos Aires, Argentina.
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Monti GE, Frankena K, Engel B, Buist W, Tarabla HD, de Jong MCM. Evaluation of a new antibody-based enzyme-linked immunosorbent assay for the detection of bovine leukemia virus infection in dairy cattle. J Vet Diagn Invest 2006; 17:451-7. [PMID: 16312236 DOI: 10.1177/104063870501700507] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The objective of this study was to validate a new blocking enzyme-linked immunosorbent assay (ELISA) (designated M108 for milk and S108 for serum samples) for detecting bovine leukemia virus (BLV) infection in dairy cattle. Milk, serum, and ethylenediaminetetraacetic acid-blood samples were collected from 524 adult Holstein cows originating from 6 dairy herds in Central Argentina. The M108 and S108 were compared with agar gel immunodiffusion (AGID), polymerase chain reaction and a commercial ELISA. Because there is currently no reference test capable of serving as a gold standard, the test sensitivity (SE) and specificity (SP) were evaluated by the use of a latent class model. Statistical inference was performed by classical maximum likelihood and by Bayesian techniques. The maximum-likelihood analysis was performed assuming conditional independence of tests, whereas the Bayesian approach allowed for conditional dependence. No clear conclusion could be drawn about conditional dependence of tests. Results with maximum likelihood (under conditional independence) and posterior Bayes (under conditional dependence) were practically the same. Conservative estimates of SE and SP (with 95% confidence intervals) for M108 were 98.6 (96.7; 99.6) and 96.7 (92.9; 98.8) and for S108 99.5 (98.2; 99.9) and 95.4 (90.9; 98.1), respectively. The ELISA 108 using either milk or serum to detect BLV-infected animals had comparable SE and SP with the official AGID and a commercial ELISA test, which are currently the most widely accepted tests for the serological diagnosis of BLV infection. Therefore, ELISA 108 can be used as an alternative test in monitoring and control programs.
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Affiliation(s)
- Gustavo E Monti
- Universidad Austral de Chile, Instituto de Medicina Preventiva, Facultad de Ciencias Veterinarias, Valdiva, Chile
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Wrathall AE, Simmons HA, Van Soom A. Evaluation of risks of viral transmission to recipients of bovine embryos arising from fertilisation with virus-infected semen. Theriogenology 2006; 65:247-74. [PMID: 16005506 DOI: 10.1016/j.theriogenology.2005.05.043] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2005] [Revised: 05/21/2005] [Accepted: 05/24/2005] [Indexed: 11/19/2022]
Abstract
This scientific review was prompted by recent legislation to curtail the use of semen from potentially virus-infected bulls to produce embryos for import into the European Union. From studies in laboratory animals, humans and horses, it is apparent that viruses may sometimes attach to, or be integrated into, spermatozoa, although in domestic livestock, including cattle, this seems to be a rare phenomenon, and carriage of virus through the zona pellucida into the oocyte by fertilising sperm has never been described in these species. Four specific viruses; enzootic bovine leukosis (EBLV), bovine herpesvirus-1 (BoHV-1), bovine viral diarrhoea virus (BVDV) and bluetongue virus (BTV), all of which tend to cause subclinical infections in cattle, but which can occur in bovine semen, are examined with regard to the risks that use of infected semen might lead to production of infected embryos. With regard to in vivo-derived embryos, when internationally approved embryo processing protocols are used, the risks from EBLV- and BTV-infected semen are negligible, and the same is almost certainly true for semen infected with BoHV-1 if the embryos are also treated with trypsin. For BVDV, there is insufficient data on how the virus is carried in semen and how different BVDV strains can interact with sperm, oocytes and embryos. There is a potential, at least, that in vivo-derived embryos resulting from infected semen might carry BVDV, although field studies so far suggest that this is very unlikely. With regard to in vitro-produced embryos, use of semen infected with any of the four viruses, with the probable exception of EBLV, will often lead to contaminated embryos, and virus removal from these embryos is difficult even when the internationally approved embryo processing protocols are used. However, it has never been demonstrated that such embryos have resulted in transmission of infection to recipients or offspring.
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Affiliation(s)
- A E Wrathall
- Animal Services Unit, Veterinary Laboratories Agency, Woodham Lane, New Haw, Weybridge, Surrey KT15 3NB, UK.
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34
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Duncan RB, Scarratt WK, Buehring GC. Detection of bovine leukemia virus by in situ polymerase chain reaction in tissues from a heifer diagnosed with sporadic thymic lymphosarcoma. J Vet Diagn Invest 2005; 17:190-4. [PMID: 15825504 DOI: 10.1177/104063870501700217] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
An 18-month-old bovine heifer was presented for clinical evaluation after a sudden onset of ventral edema. Clinical and pathological evaluations were consistent with thymic lymphosarcoma, a sporadic form of lymphosarcoma in cattle, which is not generally considered to be associated with bovine leukemia virus (BLV). This heifer was seropositive for BLV at 6 and 18 months of age. Tissues obtained at necropsy were evaluated using in situ polymerase chain reaction. The BLV proviral DNA was detected in lymphocytes of the thymus as well as in epithelial cells of the liver and kidney. This report presents evidence that thymic lymphosarcomas can be associated with BLV infection and that BLV may have a broader cellular tropism than was supposed previously.
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Affiliation(s)
- Robert B Duncan
- Department of Biomedical Sciences and Pathobiology, Virginia-Maryland Regional College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24061, USA
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35
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Suh GH, Lee JC, Lee CY, Hur TY, Son DS, Ahn BS, Kim NC, Lee CG. Establishment of a bovine leukemia virus-free dairy herd in Korea. J Vet Sci 2005; 6:227-30. [PMID: 16131826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
In view of the high prevalence rate of bovine leukemia virus (BLV) infections in cattle over the entire country, a large dairy farm in Chungnam province was chosen and 'test and segregate' program was instituted. On July 1999, ELISA test was performed on 491 animals on the farm and only 163 cattle (139 adult cows, 18 female and 6 male calves)were BLV-seronegative. From February 2000 through April 2004, the seronegative group was placed in barns 1,500 to 2,000 m from seropositive group and thereafter tested at 3-to 5-month intervals by ELISA. Animals seroconverted in consecutive tests were removed from the seronegative group immediately after the detection of anti-BLV antibodies. The changes in management were aimed at preventing iatrogenic transfer of blood between cattle. Replacement heifers imported from other countries and calves born at the farm were repeatedly tested by ELISA, and only seronegative animals were introduced into the group. As of April 2004, there were 311 cattle in the BLV seronegative group of the farm. Twenty four cows of the initial 139 adult cows were seroconverted in 2000, and no seropositive animals were found since February 2001. Follow up of the group, from which all seropositive cattle were moved to a separate location, revealed no recurrence of BLV infection for three years. The approach in the present study might be valuable for Korean producers who would like to move toward a BLV-negative status.
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Affiliation(s)
- Guk Hyun Suh
- National Livestock Research Institute, Rural Development Administration, Cheonan, Korea.
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Tiwari A, VanLeeuwen JA, Dohoo IR, Stryhn H, Keefe GP, Haddad JP. Effects of seropositivity for bovine leukemia virus, bovine viral diarrhoea virus, Mycobacterium avium subspecies paratuberculosis, and Neospora caninum on culling in dairy cattle in four Canadian provinces. Vet Microbiol 2005; 109:147-58. [PMID: 15970402 DOI: 10.1016/j.vetmic.2005.05.011] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2004] [Revised: 04/13/2005] [Accepted: 05/10/2005] [Indexed: 11/25/2022]
Abstract
The purpose of this research was to determine the effects of seropositivity for exposure to bovine leukemia virus (BLV), bovine viral diarrhoea virus (BVDV), Mycobacterium avium subspecies paratuberculosis (MAP) and Neospora caninum (NC) on overall and reason-specific culling in Canadian dairy cattle. Serum samples from, approximately, 30 randomly selected cows from 134 herds were tested for antibodies against BLV, MAP and NC using commercially available ELISA test kits, while 5 unvaccinated cattle over 6 months of age were tested for antibodies to bovine viral diarrhoea virus (BVDV). For analyzing the time (in days) to culling of cows after the blood testing, a two-step approach was utilized, non-parametric (Kaplan-Meier survival graphs) visualization and then semi-parametric survival modelling (Cox proportional hazards model), while controlling for confounding variables and adjusting for within herd clustering. For all reasons of culling, MAP-seropositive cows had a 1.38 (1.05-1.81, 95% C.I.) times increased hazard of culling compared to MAP-seronegative cows. Seropositivity for the other pathogens was not associated with an increased risk of overall culling. Among cows that were culled because of either decreased reproductive efficiency or decreased milk production or mastitis, MAP-seropositive cows were associated with 1.55 (1.12-2.15, 95% C.I.) times increased hazard compared to MAP-seronegative cows. Among cows that were culled because of reproductive inefficiency, NC-seropositive cows had a 1.43 (1.15-1.79, 95% C.I.) times greater hazard than NC-seronegative cows. Among cows that were culled because of decreased milk production, cows in BVDV-seropositive herds had a 1.86 (1.28-2.70, 95% C.I.) times increased hazard compared to cows in BVDV-seronegative herds. BLV-seropositive cows did not have an increased risk of reason-specific culling as compared to BLV-seronegative cows. No significant interaction on culling among seropositivity for the pathogens was detected, but only a limited number of cows tested seropositive for multiple pathogens. Results from our research will help in better understanding the economic impacts of these pathogens and justification for their control.
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Affiliation(s)
- Ashwani Tiwari
- Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550, University Avenue, Charlottetown, PEI, Canada C1A4P3.
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Abstract
OBJECTIVE To estimate the sensitivity, specificity and detection limits for two bulk-milk enzyme-linked immunosorbent assays, the Svanovir BLV-gp51-Ab and the Lactelisa BLV Ab Bi indirect tank 250, for the detection of antibody to bovine leucosis virus in milk. PROCEDURE Milk samples from 27 cows known to have enzootic bovine leucosis (EBL) were serially diluted with milk from a herd known to be free from the disease. The dilution at which antibodies could no longer be detected by each test was determined. A total of 1959 bulk-milk samples submitted to a laboratory for the Victorian (EBL) eradication program were tested with both the Svanovir and the Lactelisa assays. A Bayesian approach was used to calculate maximum-likelihood estimates of test sensitivity and specificity. An additional 660 bulk-milk samples were tested with both the Svanovir and the Lactelisa assays. Herds that had positive results on either or both of the assays were subjected to blood or milk testing of individual cattle. RESULTS The dilution of milk at which the Svanovir assay failed to detect enzootic bovine leucosis antibody in half of the samples was 1 in 40, whereas the comparable value for the Lactelisa was 1 in 200. Computer modeling of the operating characteristics of the Svanovir assay indicated that the sensitivity of that assay would be considerably lower than that for the Lactelisa, and the specificity was estimated to be higher. Evaluation of the assays using 660 bulk-milk samples showed that the Lactelisa assay detected four infected herds that were not detected by the Svanovir test. No false positive results were recorded for either assay. CONCLUSION Use of the Lactelisa assay in the Victorian EBL eradication program will enhance disease detection and eradication, but may also result in an increased frequency of false positive bulk-milk test results.
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Affiliation(s)
- S E Ridge
- CVO Unit, Department of Primary Industries, 475 Mickleham Road, Attwood, Victoria
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Monti G, Schrijver R, Beier D. Genetic diversity and spread of Bovine leukaemia virus isolates in Argentine dairy cattle. Arch Virol 2004; 150:443-58. [PMID: 15592892 DOI: 10.1007/s00705-004-0437-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2003] [Accepted: 10/05/2004] [Indexed: 11/24/2022]
Abstract
Effective tools for use in control programmes against bovine leukaemia virus (BLV) infections require insight into the relationship between the variant structure of the bovine leukaemia virus and the spatial-temporal interaction of isolates and hosts. Our study showed the presence of two types of BLV isolates - Australian and Argentine - in dairy herds from various parts of Central Argentina; these isolates were characterised by RFLP on PCR amplicons, and some of them were confirmed by sequencing. One genotype (Argentine) was present in all herds, and the Australian genotype was found in two herds. Phylogenetic analysis indicated four clusters. The first cluster was composed of the Argentine isolates and one from Brazil; the second was composed of several isolates found in European countries and one from Brazil; the third cluster was composed of BLV isolates found in Japan and Germany; the fourth cluster included American and Australian isolates and those from other countries. The comparison of a number of synonymous and non-synonymous nucleotide substitutions using various BLV genes revealed purifying selection, suggesting that molecular evolution occurred under some functional constraint.
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Affiliation(s)
- G Monti
- Wageningen University and Research Centre, Quantitative Veterinary Epidemiology Group, Wageningen University, P.O. Box 338, 6700 AH Wageningen, The Netherlands.
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Abstract
The aim of this study was to examine the effect of environmental contamination on the concentration of circulating immune complexes (CIC) in bovine blood. We determined that in a conventionally ecologically clear district, the CIC concentration in healthy bovine blood serum was within the limits of 0.18-0.52 mg/mL, (mean = 0.31 mg/mL, V = 30.14%). In a conventionally ecologically contaminated district, the CIC concentration in healthy bovine blood serum was detected within the limits of 0.48-0.99 mg/mL (mean = 0.65 mg/mL, V = 17.97%; P < 0.05). The CIC concentration in serum of bovine leukemia virus (BLV)-infected bovines from different districts was within the limits of 0.29-1.76 mg/mL (mean = 0.81 mg/mL, V = 36.67%; P < 0.05). According to these preliminary results of the investigation, it may be supposed that the increased concentration of CIC is closely related to the environmental contamination. Therefore, studies of CIC concentration in healthy mammals are of great importance for the monitoring of anthropogenic factors and can be exploited as an indicator of environmental contamination.
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Affiliation(s)
- A Ramanaviciene
- Laboratory of Ecological Immunology, Institute of Immunology of Vilnius University, Moletu pl. 29, 08409 Vilnius 21, Lithuania
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Meas S, Nakayama M, Usui T, Nakazato Y, Yasuda J, Ohashi K, Onuma M. Evidence for bovine immunodeficiency virus infection in cattle in Zambia. Jpn J Vet Res 2004; 52:3-8. [PMID: 15253302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
We report herein on the first evidence for the presence of bovine immunodeficiency virus (BIV) in Zambia. Serological surveillance of BIV and bovine leukemia virus (BLV) was conducted in traditional cattle herds in Zambia. Out of a total of 262 sera analyzed, 11.4% were found positive for anti-BIV p26 antibodies as determined by Western blot analysis, while 5.0% were positive for anti-BLV gp51 antibodies as detected by immunodiffusion test. Peripheral blood mononuclear cells from BIV seropositive cattle were found to have BIV-provirus DNA, as detected by nested polymerase chain reaction. A nucleotide sequence corresponding to a 298 bp fragment of the BIV pol gene was also analyzed. Amino acid sequences of these Zambian pol gene products showed 98.0 to 100% homology to the American strain BIV R29, 97.0 to 99.0% to Japanese BIV isolates, and divergence ranged from 0.0 to 2.0% among Zambian BIV isolates.
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Affiliation(s)
- Sothy Meas
- Laboratory of Infectious Diseases, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
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Lew AE, Bock RE, Molloy JB, Minchin CM, Robinson SJ, Steer P. Sensitive and specific detection of proviral bovine leukemia virus by 5' Taq nuclease PCR using a 3' minor groove binder fluorogenic probe. J Virol Methods 2004; 115:167-75. [PMID: 14667532 DOI: 10.1016/j.jviromet.2003.09.029] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Sensitive assays are required to detect proviral bovine leukemia virus (BLV) in donor cattle used for the in vivo preparation of Australian tick fever vaccines. 5' Taq nuclease assays using 3' minor groove binder DNA probes (TaqManMGB) were developed and compared to conventional PCR assays for sensitive detection of Australian BLV. Seven beef and dairy herds were screened using DNA prepared by a variety of protocols to evaluate these tests. Comparative sensitivities of PCR tests were determined by testing log(10) dilutions of plasmids with inserted BLV sequences. Animals were also screened by the BLV standard agar-gel immunodiffusion test (AGID) and commercial enzyme linked immunosorbent assays (ELISA) for antibodies, and an ELISA for detecting viral antigens expressed (VAE) in lymphocyte cultures. The TaqMan MGB assay based on the pol region was the most sensitive and specific for the detection of BLV. This is the first report of a sensitive BLV 5' Taq nuclease assay.
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Affiliation(s)
- Ala E Lew
- Agency for Food and Fibre Sciences, Queensland Department of Primary Industries, c/o Locked Mail Bag No. 4, 4105, QLD, Moorooka, Australia.
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Abstract
Cellular tropism and transcription of bovine leukemia virus (BLV) and bovine immunodeficiency-like virus (BIV) were investigated using peripheral blood mononuclear cells (PBMC) collected from a cow infected with both viruses. Each PBMC subset, purified by magnetic cell sorting, was subjected to PCR and RT-PCR for detection of their integrated proviruses and transcript mRNAs. Both BLV and BIV genomes were detected by nested PCR in CD3(+), CD4(+), CD8(+) and gammadelta T cells, B cells and monocytes. However, BLV tax transcription was only detected in B cells, and only B cells also formed BLV syncytia in CC81 cells. On the other hand, BIV transcript was detected in each subpopulation of PBMC. These results indicated that BLV can infect T cells and monocytes as well as B cells, but can be expressed by transcription only in B cells. In contrast, BIV can express its transcripts in all infected cells.
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Affiliation(s)
- Donglai Wu
- National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan
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Abstract
Bovine-leukosis virus (BLV; also termed 'bovine-leukemia virus') is a retrovirus that primarily affects lymphoid tissue of dairy and beef cattle. Our objective was to investigate the association between BLV infection and annual value of production (AVP) on dairy herds within the United States, as part of the USDA National Animal Health Monitoring System's 1996 dairy study. 1006 herds (in 20 states) with at least 30 dairy cows were interviewed during 1996. The agar-gel immunodiffusion test was used to detect serum antibodies to BLV. 10-40 cows from each herd were tested and each tested cow was classified as negative or positive based on results of a single test. A multivariable regression model was used with the 976 herds with complete data for analysis. When compared to herds with no test-positive cows, herds with test-positive cows produced 218 kg per cow (i.e. 3%) less milk. The average reduction in AVP was $59 per cow for test-positive herds relative to test-negative herds. For the dairy industry as a whole, BLV seropositivity was associated with loss to producers of $285 million and $240 million for consumers. Most of this $525 million industry loss was due to reduced milk production in test-positive herds.
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Affiliation(s)
- S L Ott
- USDA, Centers for Epidemiology and Animal Health, 2150 Centre Avenue, Building B, Mail Stop 2E5, Fort Collins, CO 80526-8117, USA.
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Abstract
OBJECTIVE To determine the baseline costs of bovine leukemia virus (BLV) infection, including costs of clinical disease and subclinical infection, in a dairy herd representative of the mid-Atlantic region and compare these costs with the cost of a test-and-manage BLV control program. DESIGN Stochastic spreadsheet model. SAMPLE POPULATION A commercial Holstein dairy herd with 100 milking cows. PROCEDURES A spreadsheet model was developed. The overall cost of infection included the cost of clinical disease (ie, lymphosarcoma [LS]) and the effects of subclinical infection on milk production and premature culling. Model input values and distributions were designed to reflect economic conditions in the mid-Atlantic region. Relative costs of infection and control were calculated for infection prevalences of 20, 50, and 80%. RESULTS Estimated mean cost to the producer per case of LS was 412 dollars; for a herd with a 50% prevalence of BLV infection, annual incidence of LS was 0.66. Mean annual cost of subclinical infection at a 50% prevalence of infection was 6,406 dollars. Mean annual cost of a test-and-manage control program was 1,765 dollars. The cost of clinical disease and subclinical infection varied substantially with the prevalence of infection, whereas the cost of control varied with herd size. CONCLUSIONS AND CLINICAL RELEVANCE Results suggested that a basic BLV control program may be economically beneficial in herds in which the prevalence of BLV infection is > or = 12.5%. Farm-specific considerations may factor prominently when weighing the costs and benefits of an individual BLV control program.
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Affiliation(s)
- J Kelly Rhodes
- Department of Veterinary Medicine, Virginia-Maryland Regional College of Veterinary Medicine, College Park, MD 20742, USA
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Rhodes JK, Pelzer KD, Johnson YJ, Russek-Cohen E. Comparison of culling rates among dairy cows grouped on the basis of serologic status for bovine leukemia virus. J Am Vet Med Assoc 2003; 223:229-31. [PMID: 12875453 DOI: 10.2460/javma.2003.223.229] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To determine the association between serologic status for bovine leukemia virus (BLV) and culling rates by use of survival times in a commercial Holstein dairy herd. DESIGN Longitudinal study. ANIMALS 593 milking cows. PROCEDURE Cattle were tested for antibodies against BLV by use of agar gel immunodiffusion or ELISA 4 times each year from 1989 to 1993 and then annually through 1999. Dates of birth, first calving, and culling or death were obtained from Dairy Herd Improvement Association records. Most cows were enrolled in the study on the date of first calving. Survival times were compared among seropositive, seronegative, and seroconverted cows with the Kaplan-Meier method and a Cox regression model stratified on the basis of year of birth. RESULTS Complete records were available for 593 of 685 (87%) cattle in the dairy herd during the study period. Median survival time for all cows was 31.7 months. Survival times, which correspond to cull rates, did not differ significantly between seropositive and seronegative cattle, whereas cattle that seroconverted during the study had a significantly longer survival time. Year of birth was positively and significantly associated with survival time. CONCLUSIONS AND CLINICAL RELEVANCE BLV serologic status was not associated with cull rate as measured by survival time in this dairy herd. This finding is in contrast to results of studies that used survival analysis techniques; our results may influence management decisions concerning BLV.
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Affiliation(s)
- J Kelly Rhodes
- Avrum Gudelsky Veterinary Center, University of Maryland, College Park, MD 20742, USA
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Abstract
Enzootic bovine leukosis (EBL) was recognized among Finnish cattle in 1966. Administrative decisions specifying and refining official control measures were given in 1966, 1976, 1980, and 1993. The measures' key principle always has been 'test and slaughter'. The EBL/bovine leukosis virus (BLV) infection situation was monitored at meat inspection, and hematologically between 1970 and 1977 and serologically between 1978 and 1989. Annual surveys including all dairy herds and samples from beef animals were conducted in 1990-2001. Bulk-tank milk samples represented the dairy herds in the surveys; the beef animals were sampled individually at slaughter. The maximum positive herd-level percentage in the surveys was 0.03%. EBL/BLV infection was evenly dispersed in the southern part of the country and nonexistent in the northern part. We conclude that herd-level prevalence of EBL/BLV infection never exceeded 5%. It nevertheless took 30 years to eradicate the disease and the infection. EBL was eradicated from mainland Finland in 1996 and from the island district of Ahvenanmaa in 1999. Annual monitoring of the EBL situation continues.
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Affiliation(s)
- L Nuotio
- National Veterinary and Food Research Institute EELA, P.O. Box 45, FIN-00581, Helsinki, Finland.
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Meas S, Yilmaz Z, Usui T, Torun S, Yesilbag K, Ohashi K, Onuma M. Evidence of bovine immunodeficiency virus in cattle in Turkey. Jpn J Vet Res 2003; 51:3-8. [PMID: 12921344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
A seroepidemiological study of bovine immunodeficiency virus (BIV) and bovine leukemia virus (BLV) infections was conducted in four different cattle herds in Turkey. A total of 300 blood samples were analyzed and 12.3% were found to be positive for anti-BIV p26 antibodies by Western blot analysis and 1.6% positive for anti-BLV gp51 antibodies by an immunodiffusion test. BIV infection was confirmed with the detection of BIV-provirus DNA using the nested polymerase chain reaction. This is the first evidence for the presence of BIV in cattle in Turkey.
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Affiliation(s)
- Sothy Meas
- Laboratory of Infectious Diseases, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060-0818, Japan
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Abstract
OBJECTIVE To evaluate the use of a polymerase chain reaction (PCR) assay in detecting bovine leukosis virus (BLV) in adult dairy cows. DESIGN Prospective study. ANIMALS 223 adult dairy cows. PROCEDURE Cows were tested for BLV status by use of an ELISA and a PCR assay. Sensitivity, specificity, predictive values of positive and negative tests, and the percentage of cows correctly classified by PCR assay were calculated. Ninety-five percent confidence intervals were calculated for sensitivity and specificity. RESULTS Sensitivity and specificity were 0.672 and 1.00, respectively. Prevalence of BLV in this herd was 0.807. Predictive value of a positive test was 1.00, and predictive value of a negative test was 0.421. The percentage of cows correctly classified by PCR assay was 73.5%. CONCLUSIONS AND CLINICAL RELEVANCE A positive PCR assay result provided definitive evidence that a cow was infected with BLV. Sensitivity and negative predictive value for PCR assay were low. Consequently, PCR assay alone is unreliable for routine detection of BLV in herds with high prevalence of the disease.
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Affiliation(s)
- Dusty W Nagy
- Department of Veterinary Clinical Medicine, College of Veterinary Medicine, University of Illinois, Urbana, IL 61802, USA
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Usui T, Meas S, Konnai S, Ohashi K, Onuma M. Seroprevalence of bovine immunodeficiency virus and bovine leukemia virus in dairy and beef cattle in hokkaido. J Vet Med Sci 2003; 65:287-9. [PMID: 12655131 DOI: 10.1292/jvms.65.287] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Serological survey of bovine immunodeficiency virus (BIV) and bovine leukemia virus (BLV) infection was conducted in dairy cattle from 10 different regions of Hokkaido, Japan. Among 390 cattle, 11.0% of cattle were BIV-seropositive and 3.3% were BLV-seropositive. Moreover, in two dairy farms, where bovine leukosis has been reported, prevalence of BIV infections were 6.4 and 9.1%, respectively. In contrast, among 150 beef cattle, 16.6% were BIV-seropositive while none was BLV-seropositive. Dual infections with BLV and BIV in dairy cattle were tested by using 107 BLV-seropositive sera, and 20 sera were found BIV-positive (18.7%). These results indicate that BIV infection was widespread in Hokkaido.
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Affiliation(s)
- Tatsufumi Usui
- Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
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Buzała E, Dereń W. Comparison of PLA with AGID and ELISA results in serology diagnosis of bovine leukosis. Pol J Vet Sci 2003; 6:9-11. [PMID: 14509350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
The aim of this study was to assess the diagnostic value of Peroxidase Linked Assay (PLA) for detecting the bovine leukemia virus (BLV) infection. Two negative and two positive reference sera were applied to 204 serum samples from dairy cows from 3 different farms (I, II and III). The best results of serological testing were obtained in the herd infected with BLV for several years (I). Amongst 10 serum samples taken at random, all were positive in AGID, ELISA and PLA. Serological tests of samples from group II revealed: 34 (73.9%) positive results in AGID and 39 (84.7%) either in ELISA or PLA. In group III positive results in AGID occured in 81.8% of cases, and 91.9% and 92.9% in ELISA and PLA respectively. The mean OD value for positive samples in groups II and III ranged between 0.943 and 0.215. Immunoperoxidase PLA is a specific and sensitive test for detection of BLV infections.
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Affiliation(s)
- E Buzała
- Department of Cell Pathology, National Veterinary Research Institute, Al. Partyzantów 57, 24-100 Puławy, Poland
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