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Afzal S, Fiaz K, Noor A, Sindhu AS, Hanif A, Bibi A, Asad M, Nawaz S, Zafar S, Ayub S, Hasnain SB, Shahid M. Interrelated Oncogenic Viruses and Breast Cancer. Front Mol Biosci 2022; 9:781111. [PMID: 35419411 PMCID: PMC8995849 DOI: 10.3389/fmolb.2022.781111] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 03/15/2022] [Indexed: 12/23/2022] Open
Abstract
Breast Cancer is a multifactorial disease and recent evidence that viruses have a greater role in its aetiology and pathophysiology than previously hypothesized, has garnered a lot of attention in the past couple of years. After the role of Mouse Mammary Tumour Virus (MMTV) in the oncogenesis of breast cancer has been proved in mice, search for similar viruses found quite a plausible relation of Human Papilloma Virus (HPV), Epstein–Barr virus (EBV), and Bovine Leukaemia Virus (BLV) with breast cancer. However, despite practical efforts to provide some clarity in this issue, the evidence that viruses cause breast cancer still remains inconclusive. Therefore, this article aims to clarify some ambiguity and elucidate the correlation of breast cancer and those particular viruses which are found to bring about the development of tumorigenesis by a previous infection or by their own oncogenic ability to manipulate the molecular mechanisms and bypass the immune system of the human body. Although many studies have reported, both, the individual and co-existing presence of HPV, EBV, MMTV, and BLV in patient sample tissues, particularly in Western women, and proposed oncogenic mechanisms, majority of the collective survey of literature fails to provide a delineated and strong conclusive evidence that viruses do, in fact, cause breast cancer. Measures to prevent these viral infections may curb breast cancer cases, especially in the West. More studies are needed to provide a definite conclusion.
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Regulation of Expression and Latency in BLV and HTLV. Viruses 2020; 12:v12101079. [PMID: 32992917 PMCID: PMC7601775 DOI: 10.3390/v12101079] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 09/20/2020] [Accepted: 09/21/2020] [Indexed: 12/14/2022] Open
Abstract
Human T-lymphotrophic virus type 1 (HTLV-1) and Bovine leukemia virus (BLV) belong to the Deltaretrovirus genus. HTLV-1 is the etiologic agent of the highly aggressive and currently incurable cancer adult T-cell leukemia (ATL) and a neurological disease HTLV-1-associated myelopathy (HAM)/tropical spastic paraparesis (TSP). BLV causes neoplastic proliferation of B cells in cattle: enzootic bovine leucosis (EBL). Despite the severity of these conditions, infection by HTLV-1 and BLV appear in most cases clinically asymptomatic. These viruses can undergo latency in their hosts. The silencing of proviral gene expression and maintenance of latency are central for the establishment of persistent infection, as well as for pathogenesis in vivo. In this review, we will present the mechanisms that control proviral activation and retroviral latency in deltaretroviruses, in comparison with other exogenous retroviruses. The 5′ long terminal repeats (5′-LTRs) play a main role in controlling viral gene expression. While the regulation of transcription initiation is a major mechanism of silencing, we discuss topics that include (i) the epigenetic control of the provirus, (ii) the cis-elements present in the LTR, (iii) enhancers with cell-type specific regulatory functions, (iv) the role of virally-encoded transactivator proteins, (v) the role of repressors in transcription and silencing, (vi) the effect of hormonal signaling, (vii) implications of LTR variability on transcription and latency, and (viii) the regulatory role of non-coding RNAs. Finally, we discuss how a better understanding of these mechanisms may allow for the development of more effective treatments against Deltaretroviruses.
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Lai YC, Lai YT, Rahman MM, Chen HW, Husna AA, Fujikawa T, Ando T, Kitahara G, Koiwa M, Kubota C, Miura N. Bovine milk transcriptome analysis reveals microRNAs and RNU2 involved in mastitis. FEBS J 2019; 287:1899-1918. [PMID: 31663680 DOI: 10.1111/febs.15114] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 07/09/2019] [Accepted: 10/29/2019] [Indexed: 12/22/2022]
Abstract
Mastitis is a common inflammatory infectious disease in dairy cows. To understand the microRNA (miRNA) expression profile changes during bovine mastitis, we undertook a genome-wide miRNA study of normal milk and milk that tested positive on the California mastitis test for bovine mastitis (CMT+). Twenty-five miRNAs were differentially expressed (23 miRNAs upregulated and two downregulated) during bovine mastitis relative to their expression in normal milk. Upregulated mature miR-1246 probably derived from a U2 small nuclear RNA rather than an miR-1246 precursor. The significantly upregulated miRNA precursors and RNU2 were significantly enriched on bovine chromosome 19, which is homologous to human chromosome 17. A gene ontology analysis of the putative mRNA targets of the significantly upregulated miRNAs showed that these miRNAs were involved in binding target mRNA transcripts and regulating target gene expression, and a Kyoto Encyclopedia of Genes and Genomes pathway analysis showed that the upregulated miRNAs were predominantly related to cancer and immune system pathways. Three novel miRNAs were associated with bovine mastitis and were relatively highly expressed in milk. We confirmed that one of the novel mastitis-related miRNAs was significantly upregulated using a digital PCR system. The differentially expressed miRNAs were involved in human cancers, infections, and immune-related diseases. The genome-wide analysis of miRNA profiles in this study provides insight into bovine mastitis and inflammatory diseases. DATABASES: The miRNAseq generated for this study can be found in the Sequence Read Archive (SRA) under BioProject Number PRJNA421075 and SRA Study Number SRP126134 (https://www.ncbi.nlm.nih.gov/bioproject/PRJNA421075).
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Affiliation(s)
- Yu-Chang Lai
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | | | - Md Mahfuzur Rahman
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan.,The United Graduate School of Veterinary Science, Yamaguchi University, Japan
| | - Hui-Wen Chen
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan.,Joint Graduate School of Veterinary Medicine, Kagoshima University, Japan
| | - Al Asmaul Husna
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan.,The United Graduate School of Veterinary Science, Yamaguchi University, Japan
| | - Takuro Fujikawa
- The United Graduate School of Veterinary Science, Yamaguchi University, Japan.,Laboratory of Veterinary Theriogenology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Takaaki Ando
- Laboratory of Veterinary Theriogenology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Go Kitahara
- Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, Japan
| | - Masateru Koiwa
- School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Japan
| | - Chikara Kubota
- Laboratory of Veterinary Theriogenology, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
| | - Naoki Miura
- Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, Japan
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Restricted viral cDNA synthesis in cell lines that fail to support productive infection by bovine leukemia virus. Arch Virol 2018; 163:2415-2422. [PMID: 29796925 DOI: 10.1007/s00705-018-3887-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 05/10/2018] [Indexed: 12/16/2022]
Abstract
Bovine leukemia virus (BLV) is the causative agent of enzootic bovine leucosis, which results in significant economic losses on many affected farms. BLV infects a wide range of animals as well as cell lines derived from various mammalian species and organs; however, studies show that only some cell lines support sustained production of viral progeny. The differences between cells that produce viral progeny and those that do not are unclear. The aim of this study was to identify the steps of BLV replication that are associated with the capacity of a cell to support a productive infection. Eleven cell lines derived from various species were categorized into two groups, those that produce BLV progeny and those that do not, and the efficiency of viral attachment was compared. In addition, viral entry and reverse transcription were compared for two BLV-producing cell lines and three non-producing cell lines. BLV attached to and entered all of the tested cells. However, synthesis of viral DNA was inhibited in all three non-virus-producing cell lines, suggesting that BLV production was blocked either prior to or at the stage of reverse transcription. These results increase our understanding of the BLV life cycle and should enable better control over the spread of BLV.
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Abstract
Bovine leukaemia virus (BLV) is the causative agent of enzootic bovine leucosis, which has been reported worldwide. BLV has been found recently in human tissue and it could have a significant impact on human health. A possible hypothesis regarding viral entry to humans is through the consumption of infected foodstuffs. This study was aimed at detecting the presence of BLV DNA in raw beef and fresh milk for human consumption. Nested PCR directed at the BLV gag gene (272 bp) was used as a diagnostic test. PCR products were confirmed by Sanger sequencing. Forty-nine per cent of the samples proved positive for the presence of proviral DNA. This is the first study highlighting the presence of the BLV gag gene in meat products for human consumption and confirms the presence of the viral DNA in raw milk, as in previous reports. The presence of viral DNA in food products could suggest that viral particles may also be found. Further studies are needed to confirm the presence of infected viral particles, even though the present findings could represent a first approach to BLV transmission to humans through foodstuff consumption.
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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] [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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Zhang R, Jiang J, Sun W, Zhang J, Huang K, Gu X, Yang Y, Xu X, Shi Y, Wang C. Lack of association between bovine leukemia virus and breast cancer in Chinese patients. Breast Cancer Res 2016; 18:101. [PMID: 27724949 PMCID: PMC5057430 DOI: 10.1186/s13058-016-0763-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Affiliation(s)
- Rong Zhang
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Animal Science and Technology, Yangzhou, China
| | - Jingting Jiang
- Department of Tumor Biological Treatment, The Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Weihong Sun
- Institute of health Sciences, Shanghai Institutes for Biological Sciences (SIBS), Chinese Academy of Sciences (CAS) & Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jilei Zhang
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Animal Science and Technology, Yangzhou, China
| | - Ke Huang
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Animal Science and Technology, Yangzhou, China
| | - Xuewen Gu
- Yangzhou University College of Medicine, Yangzhou, Jiangsu, China
| | - Yi Yang
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Animal Science and Technology, Yangzhou, China
| | - Xiulong Xu
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Animal Science and Technology, Yangzhou, China
| | - Yufang Shi
- The First Affiliated Hospital of Soochow University, Institutes for Translational Medicine, Soochow University, Suzhou, China.
| | - Chengming Wang
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University College of Animal Science and Technology, Yangzhou, China. .,Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL, USA.
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