|
1
|
Chen M, Yang C, Zhai X, Wang C, Liu M, Zhang B, Guo X, Wang Y, Li H, Liu Y, Han J, Wang X, Li J, Jia L, Li L. Comprehensive Identification and Characterization of HML-9 Group in Chimpanzee Genome. Viruses 2024; 16:892. [PMID: 38932184 PMCID: PMC11209481 DOI: 10.3390/v16060892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 05/23/2024] [Accepted: 05/27/2024] [Indexed: 06/28/2024] Open
Abstract
Endogenous retroviruses (ERVs) are related to long terminal repeat (LTR) retrotransposons, comprising gene sequences of exogenous retroviruses integrated into the host genome and inherited according to Mendelian law. They are considered to have contributed greatly to the evolution of host genome structure and function. We previously characterized HERV-K HML-9 in the human genome. However, the biological function of this type of element in the genome of the chimpanzee, which is the closest living relative of humans, largely remains elusive. Therefore, the current study aims to characterize HML-9 in the chimpanzee genome and to compare the results with those in the human genome. Firstly, we report the distribution and genetic structural characterization of the 26 proviral elements and 38 solo LTR elements of HML-9 in the chimpanzee genome. The results showed that the distribution of these elements displayed a non-random integration pattern, and only six elements maintained a relatively complete structure. Then, we analyze their phylogeny and reveal that the identified elements all cluster together with HML-9 references and with those identified in the human genome. The HML-9 integration time was estimated based on the 2-LTR approach, and the results showed that HML-9 elements were integrated into the chimpanzee genome between 14 and 36 million years ago and into the human genome between 18 and 49 mya. In addition, conserved motifs, cis-regulatory regions, and enriched PBS sequence features in the chimpanzee genome were predicted based on bioinformatics. The results show that pathways significantly enriched for ERV LTR-regulated genes found in the chimpanzee genome are closely associated with disease development, including neurological and neurodevelopmental psychiatric disorders. In summary, the identification, characterization, and genomics of HML-9 presented here not only contribute to our understanding of the role of ERVs in primate evolution but also to our understanding of their biofunctional significance.
Collapse
Affiliation(s)
- Mingyue Chen
- National 111 Center for Cellular Regulation and Molecular Pharmaceutics, Key Laboratory of Fermentation Engineering, Hubei University of Technology, Wuhan 430068, China;
| | - Caiqin Yang
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Xiuli Zhai
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
- Department of Microbiology, School of Basic Medicine, Anhui Medical University, Hefei 230032, China
| | - Chunlei Wang
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
- Department of Microbiology, School of Basic Medicine, Anhui Medical University, Hefei 230032, China
| | - Mengying Liu
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
- School of Life Sciences, Tsinghua University, Beijing 100084, China
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Bohan Zhang
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Xing Guo
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
- Department of Microbiology, School of Basic Medicine, Anhui Medical University, Hefei 230032, China
| | - Yanglan Wang
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Hanping Li
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Yongjian Liu
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Jingwan Han
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Xiaolin Wang
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Jingyun Li
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Lei Jia
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| | - Lin Li
- State Key Laboratory of Pathogen and Biosecurity, Academy of Military Medical Sciences, Beijing 100071, China; (C.Y.); (X.Z.); (C.W.); (M.L.); (B.Z.); (X.G.); (Y.W.); (H.L.); (Y.L.); (J.H.); (X.W.); (J.L.)
| |
Collapse
|
|
2
|
Mendez-Dorantes C, Burns KH. LINE-1 retrotransposition and its deregulation in cancers: implications for therapeutic opportunities. Genes Dev 2023; 37:948-967. [PMID: 38092519 PMCID: PMC10760644 DOI: 10.1101/gad.351051.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
Long interspersed element 1 (LINE-1) is the only protein-coding transposon that is active in humans. LINE-1 propagates in the genome using RNA intermediates via retrotransposition. This activity has resulted in LINE-1 sequences occupying approximately one-fifth of our genome. Although most copies of LINE-1 are immobile, ∼100 copies are retrotransposition-competent. Retrotransposition is normally limited via epigenetic silencing, DNA repair, and other host defense mechanisms. In contrast, LINE-1 overexpression and retrotransposition are hallmarks of cancers. Here, we review mechanisms of LINE-1 regulation and how LINE-1 may promote genetic heterogeneity in tumors. Finally, we discuss therapeutic strategies to exploit LINE-1 biology in cancers.
Collapse
Affiliation(s)
- Carlos Mendez-Dorantes
- Department of Pathology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA;
- Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA
- Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts 02142, USA
| | - Kathleen H Burns
- Department of Pathology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA;
- Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA
- Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts 02142, USA
| |
Collapse
|
|
3
|
Shah AH, Rivas SR, Doucet-O’Hare TT, Govindarajan V, DeMarino C, Wang T, Ampie L, Zhang Y, Banasavadi-Siddegowda YK, Walbridge S, Maric D, Garcia-Montojo M, Suter RK, Lee MH, Zaghloul KA, Steiner J, Elkahloun AG, Chandar J, Seetharam D, Desgraves J, Li W, Johnson K, Ivan ME, Komotar RJ, Gilbert MR, Heiss JD, Nath A. Human endogenous retrovirus K contributes to a stem cell niche in glioblastoma. J Clin Invest 2023; 133:e167929. [PMID: 37395282 PMCID: PMC10313366 DOI: 10.1172/jci167929] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 05/19/2023] [Indexed: 07/04/2023] Open
Abstract
Human endogenous retroviruses (HERVs) are ancestral viral relics that constitute nearly 8% of the human genome. Although normally silenced, the most recently integrated provirus HERV-K (HML-2) can be reactivated in certain cancers. Here, we report pathological expression of HML-2 in malignant gliomas in both cerebrospinal fluid and tumor tissue that was associated with a cancer stem cell phenotype and poor outcomes. Using single-cell RNA-Seq, we identified glioblastoma cellular populations with elevated HML-2 transcripts in neural progenitor-like cells (NPC-like) that drive cellular plasticity. Using CRISPR interference, we demonstrate that HML-2 critically maintained glioblastoma stemness and tumorigenesis in both glioblastoma neurospheres and intracranial orthotopic murine models. Additionally, we demonstrate that HML-2 critically regulated embryonic stem cell programs in NPC-derived astroglia and altered their 3D cellular morphology by activating the nuclear transcription factor OCT4, which binds to an HML-2-specific long-terminal repeat (LTR5Hs). Moreover, we discovered that some glioblastoma cells formed immature retroviral virions, and inhibiting HML-2 expression with antiretroviral drugs reduced reverse transcriptase activity in the extracellular compartment, tumor viability, and pluripotency. Our results suggest that HML-2 fundamentally contributes to the glioblastoma stem cell niche. Because persistence of glioblastoma stem cells is considered responsible for treatment resistance and recurrence, HML-2 may serve as a unique therapeutic target.
Collapse
Affiliation(s)
- Ashish H. Shah
- University of Miami School of Medicine, Department of Neurosurgery, Miami, Florida, USA
| | - Sarah R. Rivas
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Tara T. Doucet-O’Hare
- Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland, USA
| | - Vaidya Govindarajan
- University of Miami School of Medicine, Department of Neurosurgery, Miami, Florida, USA
| | - Catherine DeMarino
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Tongguang Wang
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Leonel Ampie
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Yong Zhang
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | | | - Stuart Walbridge
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Dragan Maric
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Marta Garcia-Montojo
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Robert K. Suter
- Georgetown University, Bioinformatics Section, Washington, DC, USA
| | - Myoung-Hwa Lee
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Kareem A. Zaghloul
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Joseph Steiner
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Abdel G. Elkahloun
- Cancer Genetics Branch, National Human Genome Research Institute, NIH, Bethesda, Maryland, USA
| | - Jay Chandar
- University of Miami School of Medicine, Department of Neurosurgery, Miami, Florida, USA
| | - Deepa Seetharam
- University of Miami School of Medicine, Department of Neurosurgery, Miami, Florida, USA
| | - Jelisah Desgraves
- University of Miami School of Medicine, Department of Neurosurgery, Miami, Florida, USA
| | - Wenxue Li
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Kory Johnson
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Michael E. Ivan
- University of Miami School of Medicine, Department of Neurosurgery, Miami, Florida, USA
| | - Ricardo J. Komotar
- University of Miami School of Medicine, Department of Neurosurgery, Miami, Florida, USA
| | - Mark R. Gilbert
- Neuro-Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland, USA
| | - John D. Heiss
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| | - Avindra Nath
- National Institute of Neurological Disorders and Stroke, NIH, Bethesda, Maryland, USA
| |
Collapse
|
|
4
|
Camargo-Forero N, Orozco-Arias S, Perez Agudelo JM, Guyot R. HERV-K (HML-2) insertion polymorphisms in the 8q24.13 region and their potential etiological associations with acute myeloid leukemia. Arch Virol 2023; 168:125. [PMID: 36988711 DOI: 10.1007/s00705-023-05747-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 02/03/2023] [Indexed: 03/30/2023]
Abstract
Human endogenous retroviruses (HERVs) are LTR retrotransposons that are present in the human genome. Among them, members of the HERV-K (HML-2) group are suspected to play a role in the development of different types of cancer, including lung, ovarian, and prostate cancer, as well as leukemia. Acute myeloid leukemia (AML) is an important disease that causes 1% of cancer deaths in the United States and has a survival rate of 28.7%. Here, we describe a method for assessing the statistical association between HERV-K (HML-2) transposable element insertion polymorphisms (or TIPs) and AML, using whole-genome sequencing and read mapping using TIP_finder software. Our results suggest that 101 polymorphisms involving HERV-K (HML-2) elements were correlated with AML, with a percentage between 44.4 to 56.6%, most of which (70) were located in the region from 8q24.13 to 8q24.21. Moreover, it was found that the TRIB1, LRATD2, POU5F1B, MYC, PCAT1, PVT1, and CCDC26 genes could be displaced or fragmented by TIPs. Furthermore, a general method was devised to facilitate analysis of the correlation between transposable element insertions and specific diseases. Finally, although the relationship between HERV-K (HML-2) TIPs and AML remains unclear, the data reported in this study indicate a statistical correlation, as supported by the χ2 test with p-values < 0.05.
Collapse
Affiliation(s)
- Nicolás Camargo-Forero
- School of Biology, Universidad Industrial de Santander, Bucaramanga, Santander, Colombia
| | - Simon Orozco-Arias
- Department of Computer Science, Universidad Autónoma de Manizales, Manizales, Caldas, Colombia.
- Department of Systems and Informatics, Universidad de Caldas, Manizales, Caldas, Colombia.
| | | | - Romain Guyot
- UMR DIADE, Université de Montpellier, Institut de recherche pour le développement, CIRAD, Montpellier, France
- Department of Electronics and Automation, Universidad Autónoma de Manizales, Manizales, Caldas, Colombia
| |
Collapse
|
|
5
|
Stricker E, Peckham-Gregory EC, Scheurer ME. HERVs and Cancer-A Comprehensive Review of the Relationship of Human Endogenous Retroviruses and Human Cancers. Biomedicines 2023; 11:936. [PMID: 36979914 PMCID: PMC10046157 DOI: 10.3390/biomedicines11030936] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/03/2023] [Accepted: 03/10/2023] [Indexed: 03/30/2023] Open
Abstract
Genomic instability and genetic mutations can lead to exhibition of several cancer hallmarks in affected cells such as sustained proliferative signaling, evasion of growth suppression, activated invasion, deregulation of cellular energetics, and avoidance of immune destruction. Similar biological changes have been observed to be a result of pathogenic viruses and, in some cases, have been linked to virus-induced cancers. Human endogenous retroviruses (HERVs), once external pathogens, now occupy more than 8% of the human genome, representing the merge of genomic and external factors. In this review, we outline all reported effects of HERVs on cancer development and discuss the HERV targets most suitable for cancer treatments as well as ongoing clinical trials for HERV-targeting drugs. We reviewed all currently available reports of the effects of HERVs on human cancers including solid tumors, lymphomas, and leukemias. Our review highlights the central roles of HERV genes, such as gag, env, pol, np9, and rec in immune regulation, checkpoint blockade, cell differentiation, cell fusion, proliferation, metastasis, and cell transformation. In addition, we summarize the involvement of HERV long terminal repeat (LTR) regions in transcriptional regulation, creation of fusion proteins, expression of long non-coding RNAs (lncRNAs), and promotion of genome instability through recombination.
Collapse
Affiliation(s)
- Erik Stricker
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77047, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77047, USA
| | | | - Michael E. Scheurer
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77047, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77047, USA
| |
Collapse
|
|
6
|
Jin X, Li X, Guan F, Zhang J. Human Endogenous Retroviruses and Toll-Like Receptors. Viral Immunol 2023; 36:73-82. [PMID: 36251943 DOI: 10.1089/vim.2022.0090] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Human endogenous retroviruses (HERVs) are estimated to comprise ∼8% of the entire human genome, but the vast majority of them remain transcriptionally silent in most normal tissues due to accumulated mutations. However, HERVs can be frequently activated and detected in various tissues under certain conditions. Nucleic acids or proteins produced by HERVs can bind to pattern recognition receptors of immune cells or other cells and initiate an innate immune response, which may be involved in some pathogenesis of diseases, especially cancer and autoimmune diseases. In this review, we collect studies of the interaction between HERV elements and Toll-like receptors and attempt to provide an overview of their role in the immunopathological mechanisms of inflammatory and autoimmune diseases.
Collapse
Affiliation(s)
- Xinyi Jin
- Department of Laboratory Medicine, School of Medicine, Shaoxing University, Shaoxing, P.R. China
| | - Xueyuan Li
- Department of Laboratory Medicine, School of Medicine, Shaoxing University, Shaoxing, P.R. China
| | - Fang Guan
- Department of Laboratory Medicine, School of Medicine, Shaoxing University, Shaoxing, P.R. China
| | - Jianhua Zhang
- Department of Laboratory Medicine, School of Medicine, Shaoxing University, Shaoxing, P.R. China
| |
Collapse
|
|
7
|
Ilse V, Scholz R, Wermann M, Naumann M, Staege MS, Roßner S, Cynis H. Immunogenicity of the Envelope Surface Unit of Human Endogenous Retrovirus K18 in Mice. Int J Mol Sci 2022; 23:ijms23158330. [PMID: 35955468 PMCID: PMC9369184 DOI: 10.3390/ijms23158330] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Revised: 07/21/2022] [Accepted: 07/25/2022] [Indexed: 02/06/2023] Open
Abstract
The triggers for the development of multiple sclerosis (MS) have not been fully understood to date. One hypothesis proposes a viral etiology. Interestingly, viral proteins from human endogenous retroviruses (HERVs) may play a role in the pathogenesis of MS. Allelic variants of the HERV-K18 env gene represent a genetic risk factor for MS, and the envelope protein is considered to be an Epstein–Barr virus-trans-activated superantigen. To further specify a possible role for HERV-K18 in MS, the present study examined the immunogenicity of the purified surface unit (SU). HERV-K18(SU) induced envelope-specific plasma IgG in immunized mice and triggered proliferation of T cells isolated from these mice. It did not trigger phenotypic changes in a mouse model of experimental autoimmune encephalomyelitis. Further studies are needed to investigate the underlying mechanisms of HERV-K18 interaction with immune system regulators in more detail.
Collapse
Affiliation(s)
- Victoria Ilse
- Department of Drug Design and Target Validation, Fraunhofer Institute for Cell Therapy and Immunology, Weinbergweg 22, 06120 Halle, Germany; (V.I.); (R.S.); (M.W.); (M.N.)
| | - Rebekka Scholz
- Department of Drug Design and Target Validation, Fraunhofer Institute for Cell Therapy and Immunology, Weinbergweg 22, 06120 Halle, Germany; (V.I.); (R.S.); (M.W.); (M.N.)
| | - Michael Wermann
- Department of Drug Design and Target Validation, Fraunhofer Institute for Cell Therapy and Immunology, Weinbergweg 22, 06120 Halle, Germany; (V.I.); (R.S.); (M.W.); (M.N.)
| | - Marcel Naumann
- Department of Drug Design and Target Validation, Fraunhofer Institute for Cell Therapy and Immunology, Weinbergweg 22, 06120 Halle, Germany; (V.I.); (R.S.); (M.W.); (M.N.)
| | - Martin S. Staege
- Department of Surgical and Conservative Pediatrics and Adolescent Medicine, Medical Faculty, Martin Luther University Halle-Wittenberg, Ernst-Grube-Str. 40, 06097 Halle, Germany;
| | - Steffen Roßner
- Paul Flechsig Institute for Brain Research, Leipzig University, Liebigstraße 19, 04103 Leipzig, Germany;
| | - Holger Cynis
- Department of Drug Design and Target Validation, Fraunhofer Institute for Cell Therapy and Immunology, Weinbergweg 22, 06120 Halle, Germany; (V.I.); (R.S.); (M.W.); (M.N.)
- Correspondence: ; Tel.: +49-345-13142835; Fax: +49-345-13142801
| |
Collapse
|
|
8
|
Bendall ML, Francis JH, Shoushtari AN, Nixon DF. Specific human endogenous retroviruses predict metastatic potential in uveal melanoma. JCI Insight 2022; 7:e147172. [PMID: 35349481 PMCID: PMC9090245 DOI: 10.1172/jci.insight.147172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 03/23/2022] [Indexed: 11/17/2022] Open
Abstract
Uveal melanoma (UM) is a unique disease in that patients with primary UM are well stratified based on their risk of developing metastasis, yet there are limited effective treatments once metastases occur. There is an urgent need to better understand the distinct molecular pathogenesis of UM and the characteristics of patients at high risk for metastasis to identify neoantigenic targets that can be used in immunotherapy and to develop novel therapeutic strategies that may effectively target this lethal transition. An important and overlooked area of molecular pathogenesis and neoantigenic targets in UM comes from human endogenous retroviruses (HERVs). We investigated the HERV expression landscape in primary UM and found that tumors were stratified into 4 HERV-based subsets that provide clear delineation of risk outcome and support subtypes identified by other molecular indicators. Specific HERV loci are associated with the risk of uveal melanoma metastasis and may offer mechanistic insights into this process, including dysregulation of HERVs on chromosomes 3 and 8. A HERV signature composed of 17 loci was sufficient to classify tumors according to subtype with greater than 95% accuracy, including at least 1 intergenic HERV with coding potential (HERVE_Xp11.23) that could represent a potential HERV E target for immunotherapy.
Collapse
Affiliation(s)
- Matthew L. Bendall
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, New York, New York, USA
| | | | - Alexander N. Shoushtari
- Melanoma Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA
- Department of Medicine, Weill Cornell Medicine, New York, New York, USA
| | - Douglas F. Nixon
- Division of Infectious Diseases, Department of Medicine, Weill Cornell Medicine, New York, New York, USA
| |
Collapse
|
|
9
|
Oncolytic viruses: A novel treatment strategy for breast cancer. Genes Dis 2021; 10:430-446. [DOI: 10.1016/j.gendis.2021.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/27/2021] [Accepted: 11/19/2021] [Indexed: 11/21/2022] Open
|
|
10
|
Helmy M, Selvarajoo K. Systems Biology to Understand and Regulate Human Retroviral Proinflammatory Response. Front Immunol 2021; 12:736349. [PMID: 34867957 PMCID: PMC8635014 DOI: 10.3389/fimmu.2021.736349] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 10/21/2021] [Indexed: 01/13/2023] Open
Abstract
The majority of human genome are non-coding genes. Recent research have revealed that about half of these genome sequences make up of transposable elements (TEs). A branch of these belong to the endogenous retroviruses (ERVs), which are germline viral infection that occurred over millions of years ago. They are generally harmless as evolutionary mutations have made them unable to produce viral agents and are mostly epigenetically silenced. Nevertheless, ERVs are able to express by still unknown mechanisms and recent evidences have shown links between ERVs and major proinflammatory diseases and cancers. The major challenge is to elucidate a detailed mechanistic understanding between them, so that novel therapeutic approaches can be explored. Here, we provide a brief overview of TEs, human ERVs and their links to microbiome, innate immune response, proinflammatory diseases and cancer. Finally, we recommend the employment of systems biology approaches for future HERV research.
Collapse
Affiliation(s)
- Mohamed Helmy
- Bioinformatics Institute (BII), Agency for Science, Technology and Research (ASTAR), Singapore, Singapore
- Department of Computer Science, Lakehead University, Thunder Bay, ON, Canada
| | - Kumar Selvarajoo
- Bioinformatics Institute (BII), Agency for Science, Technology and Research (ASTAR), Singapore, Singapore
- Singapore Institute of Food and Biotechnology Innovation (SIFBI), Agency for Science, Technology and Research (ASTAR), Singapore, Singapore
- Synthetic Biology Translational Research Program & SynCTI, Yong Loo Lin School of Medicine, National University of Singapore (NUS), Kent Ridge, Singapore
| |
Collapse
|
|
11
|
Ko EJ, Song KS, Ock MS, Choi YH, Kim S, Kim HS, Cha HJ. Expression profiles of human endogenous retrovirus (HERV)-K and HERV-R Env proteins in various cancers. BMB Rep 2021. [PMID: 33691904 PMCID: PMC8328825 DOI: 10.5483/bmbrep.2021.54.7.246] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The vertebrate genome contains an endogenous retrovirus that has been inherited from the past millions of years. Although approximately 8% of human chromosomal DNA consists of sequences derived from human endogenous retrovirus (HERV) fragments, most of the HERVs are currently inactive and non-infectious due to recombination, deletions, and mutations after insertion into the host genome. Several studies suggested that Human endogenous retroviruses (HERVs) factors are significantly related to certain cancers. However, only limited studies have been conducted to analyze the expression of HERV derived elements at protein levels in certain cancers. Herein, we analyzed the expression profiles of HERV-K envelope (Env) and HERV-R Env proteins in eleven different kinds of cancer tissues. Furthermore, the expression patterns of both protein and correlation with various clinical data in each tissue were analyzed. The expressions of both HERV-K Env and HERV-R Env protein were identified to be significantly high in most of the tumors compared with normal surrounding tissues. Correlations between HERV Env expressions and clinical investigations varied depending on the HERV types and cancers. Overall expression patterns of HERV-K Env and HERV-R Env proteins were different in every individual but a similar pattern of expressions was observed in the same individual. These results demonstrate the expression profiles of HERV-K and HERV-R Env proteins in various cancer tissues and provide a good reference for the association of endogenous retroviral Env proteins in the progression of various cancers. Furthermore, the results elucidate the relationship between HERV-Env expression and the clinical significance of certain cancers.
Collapse
Affiliation(s)
- Eun-Ji Ko
- Department of Parasitology and Genetics, Kosin University College of Medicine, Busan 49267, Korea
- Department of Biological Sciences, Pusan National University, Busan 46241, Korea
| | - Kyoung Seob Song
- Department of Physiology, Kosin University College of Medicine, Busan 49267, Korea
| | - Mee Sun Ock
- Department of Parasitology and Genetics, Kosin University College of Medicine, Busan 49267, Korea
| | - Yung Hyun Choi
- Department of Biochemistry, College of Oriental Medicine, Dongeui University, Busan 47227, Korea
| | - Suhkmann Kim
- Department of Chemistry, College of Natural Sciences, Pusan National University, Busan 46241, Korea
| | - Heui-Soo Kim
- Department of Biological Sciences, Pusan National University, Busan 46241, Korea
| | - Hee-Jae Cha
- Department of Parasitology and Genetics, Kosin University College of Medicine, Busan 49267, Korea
| |
Collapse
|
|
12
|
Achinko DA, Dormer A, Narayanan M, Norman EF. Targeted immune epitope prediction to HHLA2 and MAGEB5 protein variants as therapeutic approach to related viral diseases. BMC Immunol 2021; 22:49. [PMID: 34320928 PMCID: PMC8316541 DOI: 10.1186/s12865-021-00440-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 07/20/2021] [Indexed: 12/28/2022] Open
Abstract
Background Targeted immunotherapy is mostly associated with cancer treatment wherein designed molecules engage signaling pathways and mutant proteins critical to the survival of the cell. One of several genetic approaches is the use of in silico methods to develop immune epitopes targeting specific antigenic regions on related mutant proteins. In a recent study we showed a functional association between the gamma retrovirus HERV-H Long Terminal Associating (HHLA1, HHLA2 and HHLA3) proteins and melanoma associated antigen of the B class proteins (MAGEB5), with a resultant decrease in expression of HLA class I and II immune variants. HLA-C and HLA-DRB5 were the main HLA class I and II Immune variants, respectively, that showed expression changes across viral samples of interest. Specific immune variants for HLA-C and HLA-DRB5 were filtered for the top ten based on their relative frequency of counts across the samples. Results Protein variants for HHLA1, HHLA2, HHLA3 and MAGEB5 were used to predict antigenic epitope peptides to immune peptide-MHC class I and II binding using artificial neural networks. For IC50 peptide scores (PS) ≥ 0.5 with a transformed binding ability between 0 and 1, the top 5 epitopes identified for all targeted genes HHLA1,2 & 3 and MAGEB5 were qualified as strong or weak binders according to the threshold. Domain analysis using NCBI Conserved Domain Database (CDD) identified HHLA2 with immunoglobulin-like domains (Ig_C1-set) and MAGEB5 with the MAGE Homology Domain (MHD). Linear regression showed a statistical correlation (P < 0.001) for HHLA2 and MAGEB5 predicted epitope peptides to HLA-C but not HLA-DRB5. The prediction model identified HLA-C variant 9 (HLA-C9, BAA08825.1 HLA-B*1511) at 1.1% as the most valuable immune target for clinical considerations. Identification of the 9-mer epitope peptide within the domain showed for HHLA2: YANRTSLFY (PS = 0.5837) and VLAYYLSSSQNTIIN (PS = 0.77) for HLA-C and HLA-DRB5, respectively and for MAGEB5, peptides: FVRLTYLEY (PS = 0.5293) and YPAHYQFLWGPRAYT (PS = 0.62) for HLA-C and HLA-DRB5, respectively. Conclusion Specific immune responses to targeted epitope peptides and their prediction models, suggested co-expression and co-evolution for HHLA2 and MAGEB5 in viral related diseases. HHLA2 and MAGEB5 could be considered markers for virus related tumors and targeted therapy for oncogenic diseases. Supplementary Information The online version contains supplementary material available at 10.1186/s12865-021-00440-w.
Collapse
Affiliation(s)
- Daniel A Achinko
- PepVax, Inc., 0411 Motor City Drive, Suite #750, Bethesda, MD, 20817, USA.
| | - Anton Dormer
- PepVax, Inc., 0411 Motor City Drive, Suite #750, Bethesda, MD, 20817, USA
| | - Mahesh Narayanan
- PepVax, Inc., 0411 Motor City Drive, Suite #750, Bethesda, MD, 20817, USA
| | - Elton F Norman
- PepVax, Inc., 0411 Motor City Drive, Suite #750, Bethesda, MD, 20817, USA
| |
Collapse
|
|
13
|
Ko EJ, Song KS, Ock MS, Choi YH, Kim S, Kim HS, Cha HJ. Expression profiles of human endogenous retrovirus (HERV)-K and HERV-R Env proteins in various cancers. BMB Rep 2021; 54:368-373. [PMID: 33691904 PMCID: PMC8328825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/08/2020] [Accepted: 02/21/2021] [Indexed: 04/04/2024] Open
Abstract
The vertebrate genome contains an endogenous retrovirus that has been inherited from the past millions of years. Although approximately 8% of human chromosomal DNA consists of sequences derived from human endogenous retrovirus (HERV) fragments, most of the HERVs are currently inactive and noninfectious due to recombination, deletions, and mutations after insertion into the host genome. Several studies suggested that Human endogenous retroviruses (HERVs) factors are significantly related to certain cancers. However, only limited studies have been conducted to analyze the expression of HERV derived elements at protein levels in certain cancers. Herein, we analyzed the expression profiles of HERV-K envelope (Env) and HERV-R Env proteins in eleven different kinds of cancer tissues. Furthermore, the expression patterns of both protein and correlation with various clinical data in each tissue were analyzed. The expressions of both HERV-K Env and HERV-R Env protein were identified to be significantly high in most of the tumors compared with normal surrounding tissues. Correlations between HERV Env expressions and clinical investigations varied depending on the HERV types and cancers. Overall expression patterns of HERV-K Env and HERV-R Env proteins were different in every individual but a similar pattern of expressions was observed in the same individual. These results demonstrate the expression profiles of HERV-K and HERV-R Env proteins in various cancer tissues and provide a good reference for the association of endogenous retroviral Env proteins in the progression of various cancers. Furthermore, the results elucidate the relationship between HERV-Env expression and the clinical significance of certain cancers. [BMB Reports 2021; 54(7): 368-373].
Collapse
Affiliation(s)
- Eun-Ji Ko
- Department of Parasitology and Genetics, Busan 46241, Korea
- Department of Biological Sciences, Busan 46241, Korea
| | - Kyoung Seob Song
- Department of Physiology, Kosin University College of Medicine, Busan 49267, Korea
| | - Mee Sun Ock
- Department of Parasitology and Genetics, Busan 46241, Korea
| | - Yung Hyun Choi
- Department of Biochemistry, College of Oriental Medicine, Dongeui University, Busan 47227, Korea
| | - Suhkmann Kim
- Department of Chemistry, College of Natural Sciences, Pusan National University, Busan 46241, Korea
| | - Heui-Soo Kim
- Department of Biological Sciences, Busan 46241, Korea
| | - Hee-Jae Cha
- Department of Parasitology and Genetics, Busan 46241, Korea
| |
Collapse
|
|
14
|
Shah AH, Gilbert M, Ivan ME, Komotar RJ, Heiss J, Nath A. The role of human endogenous retroviruses in gliomas: from etiological perspectives and therapeutic implications. Neuro Oncol 2021; 23:1647-1655. [PMID: 34120190 DOI: 10.1093/neuonc/noab142] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Accounting for approximately 8% of the human genome, Human Endogenous Retroviruses (HERVs) have been implicated in a variety of cancers including gliomas. In normal cells, tight epigenetic regulation of HERVs prevent aberrant expression; however, in cancer cells, HERVs expression remains pervasive, suggesting a role of HERVs in oncogenic transformation. HERVs may contribute to oncogenesis in several ways including insertional mutagenesis, chromosomal rearrangements, proto-oncogene formation, and maintenance of stemness. On the other hand, recent data has suggested that reversing epigenetic silencing of HERVs may induce robust anti-tumor immune responses, suggesting HERVs' potential therapeutic utility in gliomas. By reversing epigenetic modifications that silence HERVs, DNA methyltransferase and histone deacetylase inhibitors may stimulate a viral-mimicry cascade via HERV-derived dsRNA formation that induce interferon-mediated apoptosis. Leveraging this anti-tumor autoimmune response may be a unique avenue to target certain subsets of epigenetically-dysregulated gliomas. Nevertheless, the role of HERVs in gliomas as either arbitrators of oncogenesis or forerunners of the innate anti-tumor immune response remains unclear. Here, we review the role of HERVs in gliomas, their potential dichotomous function in propagating oncogenesis and stimulating the anti-tumor immune response and identify future directions for research.
Collapse
Affiliation(s)
- Ashish H Shah
- Department of Neurological Surgery, University of Miami Miller School of Medicine
| | - Mark Gilbert
- Neuro-oncology Branch, National Cancer Institute, National Institute of Health
| | - Michael E Ivan
- Department of Neurological Surgery, University of Miami Miller School of Medicine
| | - Ricardo J Komotar
- Department of Neurological Surgery, University of Miami Miller School of Medicine
| | | | | |
Collapse
|
|
15
|
Human Endogenous Retroviruses as Biomedicine Markers. Virol Sin 2021; 36:852-858. [PMID: 33905075 DOI: 10.1007/s12250-021-00387-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Accepted: 03/15/2021] [Indexed: 11/27/2022] Open
Abstract
Human endogenous retroviruses (HERVs) were formed via ancient integration of exogenous retroviruses into the human genome and are considered to be viral "fossils". The human genome is embedded with a considerable amount of HERVs, witnessing the long-term evolutionary history of the viruses and the host. Most HERVs have lost coding capability during selection but still function in terms of HERV-mediated regulation of host gene expression. In this review, we summarize the roles of HERV activation in response to viral infections and diseases, and emphasize the potential use of HERVs as biomedicine markers in the early diagnosis of diseases such as cancer, which provides a new perspective for the clinical application of HERVs.
Collapse
|
|
16
|
Kang BH, Momin N, Moynihan KD, Silva M, Li Y, Irvine DJ, Wittrup KD. Immunotherapy-induced antibodies to endogenous retroviral envelope glycoprotein confer tumor protection in mice. PLoS One 2021; 16:e0248903. [PMID: 33857179 PMCID: PMC8049297 DOI: 10.1371/journal.pone.0248903] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Accepted: 03/07/2021] [Indexed: 12/02/2022] Open
Abstract
Following curative immunotherapy of B16F10 tumors, ~60% of mice develop a strong antibody response against cell-surface tumor antigens. Their antisera confer prophylactic protection against intravenous challenge with B16F10 cells, and also cross-react with syngeneic and allogeneic tumor cell lines MC38, EL.4, 4T1, and CT26. We identified the envelope glycoprotein (env) of a murine endogenous retrovirus (ERV) as the antigen accounting for the majority of this humoral response. A systemically administered anti-env monoclonal antibody cloned from such a response protects against tumor challenge, and prophylactic vaccination against the env protein protects a majority of naive mice from tumor establishment following subcutaneous inoculation with B16F10 cells. These results suggest the potential for effective prophylactic vaccination against analogous HERV-K env expressed in numerous human cancers.
Collapse
Affiliation(s)
- Byong H. Kang
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Noor Momin
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Kelly D. Moynihan
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Cambridge, Massachusetts, United States of America
| | - Murillo Silva
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Yingzhong Li
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Darrell J. Irvine
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology and Harvard University, Cambridge, Massachusetts, United States of America
- Howard Hughes Medical Institute, Chevy Chase, Maryland, United States of America
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - K. Dane Wittrup
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| |
Collapse
|
|
17
|
Yuan Z, Yang Y, Zhang N, Soto C, Jiang X, An Z, Zheng WJ. Human Endogenous Retroviruses in Glioblastoma Multiforme. Microorganisms 2021; 9:764. [PMID: 33917421 PMCID: PMC8067472 DOI: 10.3390/microorganisms9040764] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 03/28/2021] [Accepted: 03/29/2021] [Indexed: 12/13/2022] Open
Abstract
Glioblastoma multiforme (GBM) is the most aggressive and deadly brain tumor. It is primarily diagnosed in the elderly and has a 5-year survival rate of less than 6% even with the most aggressive therapies. The lack of biomarkers has made the development of immunotherapy for GBM challenging. Human endogenous retroviruses (HERVs) are a group of viruses with long terminal repeat (LTR) elements, which are believed to be relics from ancient viral infections. Recent studies have found that those repetitive elements play important roles in regulating various biological processes. The differentially expressed LTR elements from HERVs are potential biomarkers for immunotherapy to treat GBM. However, the understanding of the LTR element expression in GBM is greatly lacking. METHODS We obtained 1077.4 GB of sequencing data from public databases. These data were generated from 111 GBM tissue studies, 30 GBM cell lines studies, and 45 normal brain tissues studies. We analyzed repetitive elements that were differentially expressed in GBM and normal brain samples. RESULTS We found that 48 LTR elements were differentially expressed (p-value < 0.05) between GBM and normal brain tissues, of which 46 were HERV elements. Among these 46 elements, 34 significantly changed HERVs belong to the ERV1 superfamily. Furthermore, 43 out of the 46 differentially expressed HERV elements were upregulated. CONCLUSION Our results indicate significant differential expression of many HERV LTR elements in GBM and normal brain tissues. Expression levels of these elements could be developed as biomarkers for GBM treatments.
Collapse
Affiliation(s)
- Zihao Yuan
- School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (Z.Y.); (Y.Y.); (X.J.)
- Texas Therapeutics Institute, Institute of Molecular Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA;
| | - Yuntao Yang
- School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (Z.Y.); (Y.Y.); (X.J.)
| | - Ningyan Zhang
- Texas Therapeutics Institute, Institute of Molecular Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA;
| | - Claudio Soto
- Department of Neurology, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA;
| | - Xiaoqian Jiang
- School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (Z.Y.); (Y.Y.); (X.J.)
| | - Zhiqiang An
- Texas Therapeutics Institute, Institute of Molecular Medicine, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA;
| | - Wenjin Jim Zheng
- School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, TX 77030, USA; (Z.Y.); (Y.Y.); (X.J.)
| |
Collapse
|
|
18
|
Cardelli M, Doorn RV, Larcher L, Donato MD, Piacenza F, Pierpaoli E, Giacconi R, Malavolta M, Rachakonda S, Gruis NA, Molven A, Andresen PA, Pjanova D, van den Oord JJ, Provinciali M, Nagore E, Kumar R. Association of HERV-K and LINE-1 hypomethylation with reduced disease-free survival in melanoma patients. Epigenomics 2020; 12:1689-1706. [PMID: 33125285 DOI: 10.2217/epi-2020-0127] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: To evaluate CpG methylation of long interspersed nuclear elements 1 (LINE-1) and human endogenous retrovirus K (HERV-K) retroelements as potential prognostic biomarkers in cutaneous melanoma. Materials & methods: Methylation of HERV-K and LINE-1 retroelements was assessed in resected melanoma tissues from 82 patients ranging in age from 14 to 88 years. In addition, nevi from eight patients were included for comparison with nonmalignant melanocytic lesions. Results: Methylation levels were lower in melanomas than in nevi. HERV-K and LINE-1 methylation were decreased in melanoma patients with clinical parameters associated with adverse prognosis, while they were independent of age and gender. Hypomethylation of HERV-K (but not LINE-1) was an independent predictor of reduced disease-free survival. Conclusion: HERV-K hypomethylation can be a potential independent biomarker of melanoma recurrence.
Collapse
Affiliation(s)
- Maurizio Cardelli
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Remco van Doorn
- Department of Dermatology, Leiden University Medical Center, 2300RC Leiden, The Netherlands
| | - Lares Larcher
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Michela Di Donato
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Francesco Piacenza
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Elisa Pierpaoli
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Robertina Giacconi
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Marco Malavolta
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Sivaramakrishna Rachakonda
- Division of Molecular Genetic Epidemiology, German Cancer Research Center, 69120 Heidelberg, Germany.,Division of Functional Genome Analysis, German Cancer Research Center, 69120 Heidelberg, Germany
| | - Nelleke A Gruis
- Department of Dermatology, Leiden University Medical Center, 2300RC Leiden, The Netherlands
| | - Anders Molven
- Gade Laboratory for Pathology, Department of Clinical Medicine, University of Bergen, N-5020 Bergen, Norway.,Department of Pathology, Haukeland University Hospital, N-5021 Bergen, Norway
| | - Per Arne Andresen
- Department of Pathology, Oslo University Hospital, Rikshospitalet, 0424 Oslo, Norway
| | - Dace Pjanova
- Latvian Biomedical Research & Study Centre, LV-1067 Riga, Latvia
| | | | - Mauro Provinciali
- Advanced Technology Center for Aging Research, Scientific Technological Area, IRCCS INRCA, 60121 Ancona, Italy
| | - Eduardo Nagore
- Department of Dermatology, Instituto Valenciano de Oncología, 46009 València, Spain
| | - Rajiv Kumar
- Division of Molecular Genetic Epidemiology, German Cancer Research Center, 69120 Heidelberg, Germany.,Division of Functional Genome Analysis, German Cancer Research Center, 69120 Heidelberg, Germany
| |
Collapse
|
|
19
|
Orozco-Arias S, Tobon-Orozco N, Piña JS, Jiménez-Varón CF, Tabares-Soto R, Guyot R. TIP_finder: An HPC Software to Detect Transposable Element Insertion Polymorphisms in Large Genomic Datasets. BIOLOGY 2020; 9:biology9090281. [PMID: 32917036 PMCID: PMC7563458 DOI: 10.3390/biology9090281] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 09/01/2020] [Accepted: 09/07/2020] [Indexed: 12/12/2022]
Abstract
Transposable elements (TEs) are non-static genomic units capable of moving indistinctly from one chromosomal location to another. Their insertion polymorphisms may cause beneficial mutations, such as the creation of new gene function, or deleterious in eukaryotes, e.g., different types of cancer in humans. A particular type of TE called LTR-retrotransposons comprises almost 8% of the human genome. Among LTR retrotransposons, human endogenous retroviruses (HERVs) bear structural and functional similarities to retroviruses. Several tools allow the detection of transposon insertion polymorphisms (TIPs) but fail to efficiently analyze large genomes or large datasets. Here, we developed a computational tool, named TIP_finder, able to detect mobile element insertions in very large genomes, through high-performance computing (HPC) and parallel programming, using the inference of discordant read pair analysis. TIP_finder inputs are (i) short pair reads such as those obtained by Illumina, (ii) a chromosome-level reference genome sequence, and (iii) a database of consensus TE sequences. The HPC strategy we propose adds scalability and provides a useful tool to analyze huge genomic datasets in a decent running time. TIP_finder accelerates the detection of transposon insertion polymorphisms (TIPs) by up to 55 times in breast cancer datasets and 46 times in cancer-free datasets compared to the fastest available algorithms. TIP_finder applies a validated strategy to find TIPs, accelerates the process through HPC, and addresses the issues of runtime for large-scale analyses in the post-genomic era.
Collapse
Affiliation(s)
- Simon Orozco-Arias
- Department of Computer Science, Universidad Autónoma de Manizales, Manizales 170002, Colombia; (N.T.-O.); (J.S.P.)
- Department of Systems and Informatics, Universidad de Caldas, Manizales 170002, Colombia
- Correspondence: (S.O.-A.); (R.G.)
| | - Nicolas Tobon-Orozco
- Department of Computer Science, Universidad Autónoma de Manizales, Manizales 170002, Colombia; (N.T.-O.); (J.S.P.)
| | - Johan S. Piña
- Department of Computer Science, Universidad Autónoma de Manizales, Manizales 170002, Colombia; (N.T.-O.); (J.S.P.)
| | | | - Reinel Tabares-Soto
- Department of Electronics and Automation, Universidad Autónoma de Manizales, Manizales 170002, Colombia;
| | - Romain Guyot
- Department of Electronics and Automation, Universidad Autónoma de Manizales, Manizales 170002, Colombia;
- Institut de Recherche pour le Développement (IRD), CIRAD, Université de Montpellier, 34394 Montpellier, France
- Correspondence: (S.O.-A.); (R.G.)
| |
Collapse
|
|
20
|
Salavatiha Z, Soleimani-Jelodar R, Jalilvand S. The role of endogenous retroviruses-K in human cancer. Rev Med Virol 2020; 30:1-13. [PMID: 32734655 DOI: 10.1002/rmv.2142] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 12/15/2022]
Abstract
It is known that human endogenous retroviruses (HERVs) constitute almost 8% of the human genome. Although the expression of HERVs from the human genome is tightly regulated, different exogenous and endogenous factors could trigger HERV activation. Aberrant expression of different HERVs may potentially cause a variety of diseases such as neurological and autoimmune diseases as well as cancer. It is suggested that HERV-K can induce cancer through different mechanisms that are discussed. The interplay between some tumor viruses and HERV-K seems to be a key player in progression of viral-associated cancers because elevated levels of Rec and Np9 proteins are observed in several cancers. The frequent over expression of HERV proteins and some specific antibodies in cancer cells could be considered as suitable prognostic and therapeutic biomarkers in diagnosis and treatment of cancers. The expression of HERV proteins in cancers and development of immune responses against them may also be used as targets for cancer immunotherapy. Further studies are warranted to evaluate the role of HERVs in cancer formation and use of different HERV proteins in developing new diagnostic and therapeutic approaches for cancer treatments.
Collapse
Affiliation(s)
- Zahra Salavatiha
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Rahim Soleimani-Jelodar
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Somayeh Jalilvand
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| |
Collapse
|
|
21
|
Pisano MP, Grandi N, Tramontano E. High-Throughput Sequencing is a Crucial Tool to Investigate the Contribution of Human Endogenous Retroviruses (HERVs) to Human Biology and Development. Viruses 2020; 12:E633. [PMID: 32545287 PMCID: PMC7354619 DOI: 10.3390/v12060633] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 06/07/2020] [Accepted: 06/10/2020] [Indexed: 01/19/2023] Open
Abstract
Human Endogenous retroviruses (HERVs) are remnants of ancient retroviral infections that represent a large fraction of our genome. Their transcriptional activity is finely regulated in early developmental stages and their expression is modulated in different cell types and tissues. Such activity has an impact on human physiology and pathology that is only partially understood up to date. Novel high-throughput sequencing tools have recently allowed for a great advancement in elucidating the various HERV expression patterns in different tissues as well as the mechanisms controlling their transcription, and overall, have helped in gaining better insights in an all-inclusive understanding of the impact of HERVs in biology of the host.
Collapse
Affiliation(s)
- Maria Paola Pisano
- Laboratory of Molecular Virology, Department of Life and Environmental Sciences, University of Cagliari, 09042 Cagliari, Italy; (M.P.P.); (N.G.)
| | - Nicole Grandi
- Laboratory of Molecular Virology, Department of Life and Environmental Sciences, University of Cagliari, 09042 Cagliari, Italy; (M.P.P.); (N.G.)
| | - Enzo Tramontano
- Laboratory of Molecular Virology, Department of Life and Environmental Sciences, University of Cagliari, 09042 Cagliari, Italy; (M.P.P.); (N.G.)
- Istituto di Ricerca Genetica e Biomedica, Consiglio Nazionale delle Ricerche, 09042 Cagliari, Italy
| |
Collapse
|
|
22
|
What patents tell us about drug repurposing for cancer: A landscape analysis. Semin Cancer Biol 2019; 68:3-7. [PMID: 31546010 DOI: 10.1016/j.semcancer.2019.09.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 09/05/2019] [Accepted: 09/17/2019] [Indexed: 12/12/2022]
Abstract
Intellectual property documents (patents and their published applications) are not only collections of legal exclusivity claims but also repositories of scientific and technical information, even though they are not peer reviewed. We have identified and analyzed international disclosures concerning drug repurposing for cancer that were published under the Patent Convention Treaty during the past five years, and show this burgeoning field from an angle that is not routinely captured in review papers of the field. We find that patenting activity for cancer-related new uses for known compounds has been quite constant recently and has targeted mainly small molecule active ingredients that are currently marketed as drugs. Universities contributed most applications, closely followed by corporations. The strong representation of non-academic research institutes from the public and private sector and foundations was surprising and indicates that drug repurposing for cancer has transcended the classical corporate-academia dichotomy. Many of the identified patent documents report findings that are not reflected in the peer review literature (e.g., sumatriptan for mycosis fungoides) or appear there only later (e.g., ibudilast for glioblastoma). Synergistic combinations of several repurposed compounds were also identified, as were two documents related to the repurposing of vaccines. Our findings underscore the necessity for drug repurposers as well as for oncologists to investigate patent documents in addition to the usual peer review literature search to obtain a comprehensive perspective of the state of the art.
Collapse
|
|
23
|
Extracellular Vesicles Released by Colorectal Cancer Cell Lines Modulate Innate Immune Response in Zebrafish Model: The Possible Role of Human Endogenous Retroviruses. Int J Mol Sci 2019; 20:ijms20153669. [PMID: 31357477 PMCID: PMC6695895 DOI: 10.3390/ijms20153669] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 07/24/2019] [Indexed: 12/12/2022] Open
Abstract
Extracellular vesicles (EVs) are important components of the metastatic niche and are crucial in infiltration, metastasis, and immune tolerance processes during tumorigenesis. We hypothesized that human endogenous retroviruses (HERV) positive EVs derived from tumor cellsmay have a role in modulating the innate immune response. The study was conducted in two different colorectal cancer cell lines, representing different stages of cancer development: Caco-2, derived from a non-metastatic colorectal adenocarcinoma, and SK-CO-1, derived from metastatic colorectal adenocarcinoma (ascites). Both cell lines were treated with decitabine to induce global hypomethylation and to reactivate HERV expression. EVs were quantified by nanoparticle tracking analysis, and HERV-positive EV concentrations were measured by flow cytometry. The effect of EVs isolated from both untreated and decitabine-treated cells on the innate immune response was evaluated by injecting them in zebrafish embryos and then assessing Interleukin 1β (IL1-β), Interleukin 10 (IL-10), and the myeloperoxidase (mpx) expression levels by real-time qPCR. Interestingly, HERV-K positive EVs concentrations were significantly associated with a reduced expression of IL1-β and mpx, supporting our hypothesis that HERV-positive EVs may act as immunomodulators in tumor progression. The obtained results open new perspectives about the modulation of the immune response in cancer therapy.
Collapse
|
|
24
|
Chen Y, Yan Q, Zhou P, Li S, Zhu F. HERV-W env regulates calcium influx via activating TRPC3 channel together with depressing DISC1 in human neuroblastoma cells. J Neurovirol 2018; 25:101-113. [PMID: 30397826 DOI: 10.1007/s13365-018-0692-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 10/06/2018] [Accepted: 10/24/2018] [Indexed: 12/11/2022]
Abstract
The activation and involvement of human endogenous retroviruses W family envelope gene (HERV-W env, also called ERVWE1) have been reported in several neuropsychiatric disorders, including schizophrenia, as well as in multiple sclerosis (MS). Dysregulation of intracellular calcium content is also involved in the pathogenesis of these diseases. Our previous studies showed that HERV-W env overexpression results in activation of small conductance Ca2+-activated K+ channel protein 3 (SK3), a potential risk factor for schizophrenia. In the present study, we aimed to elucidate the relationship between HERV-W env and calcium signaling in schizophrenia. Our results showed that HERV-W env could induce Ca2+ influx in two human neuroblastoma cell lines and upregulate the expression and activation of TRPC3 in cells. The abnormal increase in intracellular Ca2+ concentration was inhibited by addition of the TRPC3 channel blocker pyr3, demonstrating that the Ca2+ influx induced by HERV-W env was TRPC3-dependent. Further experiments showed that HERV-W env overexpression downregulated DISC1, while knockdown of DISC1 promoted activation of TRPC3 without affecting TRPC3 expression. In conclusion, HERV-W env induced Ca2+ influx in human neuroblastoma cells by activating the TRPC3 channel through directly regulating its expression or downregulating DISC1, which could also increase TRPC3 activation without affecting TRPC3 expression. These findings provide new insights into how HERV-W env affects neuronal activity and contributes to the pathogenesis of schizophrenia.
Collapse
Affiliation(s)
- Yatang Chen
- Department of Medical Microbiology, School of Medicine, Wuhan University, 185 Donghu Road, Wuhan, 430071, People's Republic of China
| | - Qiujin Yan
- Department of Medical Microbiology, School of Medicine, Wuhan University, 185 Donghu Road, Wuhan, 430071, People's Republic of China
| | - Ping Zhou
- Department of Medical Microbiology, School of Medicine, Wuhan University, 185 Donghu Road, Wuhan, 430071, People's Republic of China
| | - Shan Li
- Department of Integrated Medicine, Dongfeng Hospital, Hubei University of Medicine, Hubei, 442000, People's Republic of China
| | - Fan Zhu
- Department of Medical Microbiology, School of Medicine, Wuhan University, 185 Donghu Road, Wuhan, 430071, People's Republic of China. .,Hubei Province Key Laboratory of Allergy and Immunology, Wuhan University, Wuhan, 430071, People's Republic of China.
| |
Collapse
|
|
25
|
Garcia-Montojo M, Doucet-O'Hare T, Henderson L, Nath A. Human endogenous retrovirus-K (HML-2): a comprehensive review. Crit Rev Microbiol 2018; 44:715-738. [PMID: 30318978 DOI: 10.1080/1040841x.2018.1501345] [Citation(s) in RCA: 110] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The human genome contains a large number of retroviral elements acquired over the process of evolution, some of which are specific to primates. However, as many of these are defective or silenced through epigenetic changes, they were historically considered "junk DNA" and their potential role in human physiology or pathological circumstances have been poorly studied. The most recently acquired, human endogenous retrovirus-K (HERV-K), has multiple copies in the human genome and some of them have complete open reading frames that are transcribed and translated, especially in early embryogenesis. Phylogenetically, HERV-K is considered a supergroup of viruses. One of the subtypes, termed HML-2, seems to be the most active and hence, it is the best studied. Aberrant expression of HML-2 in adult tissues has been associated with certain types of cancer and with neurodegenerative diseases. This review discusses the discovery of these viruses, their classification, structure, regulation and potential for replication, physiological roles, and their involvement in disease pathogenesis. Finally, it presents different therapeutic approaches being considered to target these viruses.
Collapse
Affiliation(s)
- Marta Garcia-Montojo
- a Section of Infections of the Nervous System , National Institute of Neurological Disorders and Stroke, National Institutes of Health , Bethesda , MD , USA
| | - Tara Doucet-O'Hare
- a Section of Infections of the Nervous System , National Institute of Neurological Disorders and Stroke, National Institutes of Health , Bethesda , MD , USA
| | - Lisa Henderson
- a Section of Infections of the Nervous System , National Institute of Neurological Disorders and Stroke, National Institutes of Health , Bethesda , MD , USA
| | - Avindra Nath
- a Section of Infections of the Nervous System , National Institute of Neurological Disorders and Stroke, National Institutes of Health , Bethesda , MD , USA
| |
Collapse
|
|
26
|
Wallace AD, Wendt GA, Barcellos LF, de Smith AJ, Walsh KM, Metayer C, Costello JF, Wiemels JL, Francis SS. To ERV Is Human: A Phenotype-Wide Scan Linking Polymorphic Human Endogenous Retrovirus-K Insertions to Complex Phenotypes. Front Genet 2018; 9:298. [PMID: 30154825 PMCID: PMC6102640 DOI: 10.3389/fgene.2018.00298] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 07/16/2018] [Indexed: 12/13/2022] Open
Abstract
Approximately 8% of the human genome is comprised of endogenous retroviral insertions (ERVs) originating from historic retroviral integration into germ cells. The function of ERVs as regulators of gene expression is well established. Less well studied are insertional polymorphisms of ERVs and their contribution to the heritability of complex phenotypes. The most recent integration of ERV, HERV-K, is expressed in a range of complex human conditions from cancer to neurologic diseases. Using an in-house computational pipeline and whole-genome sequencing data from the diverse 1,000 Genomes Phase 3 population (n = 2,504), we identified 46 polymorphic HERV-K insertions that are tagged by adjacent single nucleotide polymorphisms (SNPs). To test the potential role of polymorphic HERV-K in the heritability of complex diseases, existing databases were queried for enrichment of established relationships between the HERV-K insertion-associated SNPs (hiSNPs), and tissue specific gene expression and disease phenotypes. Overall, hiSNPs for the 46 polymorphic HERV-K sites were statistically enriched (p < 1.0E-16) for eQTLs across 44 human tissues. Fifteen of the 46 HERV-K insertions had hiSNPs annotated in the EMBL-EBI GWAS Catalog and cumulatively associated with >100 phenotypes. Experimental factor ontology enrichment analysis suggests that polymorphic HERV-K specifically contribute to neurologic and immunologic disease phenotypes, including traits related to intra cranial volume (FDR 2.00E-09), Parkinson's disease (FDR 1.80E-09), and autoimmune diseases (FDR 1.80E-09). These results provide strong candidates for context-specific study of polymorphic HERV-K insertions in disease-related traits, serving as a roadmap for future studies of the heritability of complex disease.
Collapse
Affiliation(s)
- Amelia D Wallace
- Division of Epidemiology, School of Public Health, University of California, Berkeley, Berkeley, CA, United States
| | - George A Wendt
- Division of Epidemiology, School of Community Health Sciences, University of Nevada, Reno, NV, United States
| | - Lisa F Barcellos
- Division of Epidemiology, School of Public Health, University of California, Berkeley, Berkeley, CA, United States
| | - Adam J de Smith
- Department of Epidemiology and Biostatistics, Helen Diller Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, United States
| | - Kyle M Walsh
- Department of Neurosurgery, Duke University, Durham, NC, United States
| | - Catherine Metayer
- Division of Epidemiology, School of Public Health, University of California, Berkeley, Berkeley, CA, United States
| | - Joseph F Costello
- Department of Neurosurgery, Helen Diller Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, United States
| | - Joseph L Wiemels
- Department of Epidemiology and Biostatistics, Helen Diller Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, United States.,Department of Neurosurgery, Helen Diller Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, United States
| | - Stephen S Francis
- Division of Epidemiology, School of Community Health Sciences, University of Nevada, Reno, NV, United States.,Department of Epidemiology and Biostatistics, Helen Diller Comprehensive Cancer Center, University of California, San Francisco, San Francisco, CA, United States
| |
Collapse
|
|
27
|
Balestrieri E, Argaw-Denboba A, Gambacurta A, Cipriani C, Bei R, Serafino A, Sinibaldi-Vallebona P, Matteucci C. Human Endogenous Retrovirus K in the Crosstalk Between Cancer Cells Microenvironment and Plasticity: A New Perspective for Combination Therapy. Front Microbiol 2018; 9:1448. [PMID: 30013542 PMCID: PMC6036167 DOI: 10.3389/fmicb.2018.01448] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 06/11/2018] [Indexed: 12/24/2022] Open
Abstract
Abnormal activation of human endogenous retroviruses (HERVs) has been associated with several diseases such as cancer, autoimmunity, and neurological disorders. In particular, in cancer HERV activity and expression have been specifically associated with tumor aggressiveness and patient outcomes. Cancer cell aggressiveness is intimately linked to the acquisition of peculiar plasticity and heterogeneity based on cell stemness features, as well as on the crosstalk between cancer cells and the microenvironment. The latter is a driving factor in the acquisition of aggressive phenotypes, associated with metastasis and resistance to conventional cancer therapies. Remarkably, in different cell types and stages of development, HERV expression is mainly regulated by epigenetic mechanisms and is subjected to a very precise temporal and spatial regulation according to the surrounding microenvironment. Focusing on our research experience with HERV-K involvement in the aggressiveness and plasticity of melanoma cells, this perspective aims to highlight the role of HERV-K in the crosstalk between cancer cells and the tumor microenvironment. The implications for a combination therapy targeted at HERVs with standard approaches are discussed.
Collapse
Affiliation(s)
- Emanuela Balestrieri
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Ayele Argaw-Denboba
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Alessandra Gambacurta
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Chiara Cipriani
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| | - Roberto Bei
- Department of Clinical Sciences and Translational Medicine, University of Rome "Tor Vergata", Rome, Italy
| | - Annalucia Serafino
- Institute of Translational Pharmacology, National Research Council, Rome, Italy
| | - Paola Sinibaldi-Vallebona
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy.,Institute of Translational Pharmacology, National Research Council, Rome, Italy
| | - Claudia Matteucci
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Rome, Italy
| |
Collapse
|
|
28
|
Mastrangelo G, Pavanello S, Fadda E, Buja A, Fedeli U. Yellow fever vaccine 17D administered to healthy women aged between 40 and 54 years halves breast cancer risk: an observational study. Eur J Cancer Prev 2018; 27:303-309. [PMID: 27870643 PMCID: PMC6012044 DOI: 10.1097/cej.0000000000000333] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 10/25/2016] [Indexed: 12/11/2022]
Abstract
Transcripts of human endogenous retrovirus K are expressed in most breast cancers (BCs). Yellow fever vaccine 17D (YFV) expresses a protein with a closely homologous epitope. Cross-reactive immunity could hypothetically inhibit BC growth at least in women aged around 50 years at diagnosis, in whom the prognosis of BC was found to be better than that in women younger or older. A cohort of 12 804 women who received YFV in the Veneto Region, Italy, was divided into two subcohorts according to age at vaccination and followed up through the Veneto Tumor Registry. The time since vaccination until cancer incidence was categorized (≤1.9; 2-3.9; 4-5.9; 6-7.9; 8-10.9; ≥11 years) and, using the lowest class as a reference, the incidence rate ratio for BC with a 95% confidence interval and P-value was estimated by Poisson regression in each time since vaccination class, adjusting for age and calendar period. In 3140 women vaccinated at 40-54 years of age, YFV administration resulted in a protective effect of long duration slowly fading over time with a U-shaped pattern of response. Overall, BC risk was reduced by about 50% (incidence rate ratio=0.46; 95% confidence interval=0.26-0.83; P=0.009) 2 years after vaccination. Cross-reactive antigens could not be the mechanism because no protection was observed in women vaccinated before 40 or after 54 years of age. BC cells in a microscopic stage of disease can be destroyed or severely damaged by YFV if BC is not very aggressive. To prove that treatment is truly effective, a placebo-controlled double-blind trial should be conducted.
Collapse
Affiliation(s)
| | | | | | | | - Ugo Fedeli
- Regional Epidemiology Service, Veneto Region, Padova, Italy
| |
Collapse
|
|
29
|
Kassiotis G, Stoye JP. Making a virtue of necessity: the pleiotropic role of human endogenous retroviruses in cancer. Philos Trans R Soc Lond B Biol Sci 2018; 372:rstb.2016.0277. [PMID: 28893944 PMCID: PMC5597744 DOI: 10.1098/rstb.2016.0277] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/09/2017] [Indexed: 12/18/2022] Open
Abstract
Like all other mammals, humans harbour an astonishing number of endogenous retroviruses (ERVs), as well as other retroelements, embedded in their genome. These remnants of ancestral germline infection with distinct exogenous retroviruses display various degrees of open reading frame integrity and replication capability. Modern day exogenous retroviruses, as well as the infectious predecessors of ERVs, are demonstrably oncogenic. Further, replication-competent ERVs continue to cause cancers in many other species of mammal. Moreover, human cancers are characterized by transcriptional activation of human endogenous retroviruses (HERVs). These observations conspire to incriminate HERVs as causative agents of human cancer. However, exhaustive investigation of cancer genomes suggests that HERVs have entirely lost the ability for re-infection and thus the potential for insertional mutagenic activity. Although there may be non-insertional mechanisms by which HERVs contribute to cancer development, recent evidence also uncovers potent anti-tumour activities exerted by HERV replication intermediates or protein products. On balance, it appears that HERVs, despite their oncogenic past, now represent potential targets for immune-mediated anti-tumour mechanisms. This article is part of the themed issue ‘Human oncogenic viruses’.
Collapse
Affiliation(s)
- George Kassiotis
- Retroviral Immunology, The Francis Crick Institute, London, UK .,Department of Medicine, Faculty of Medicine, Imperial College London, London, UK
| | - Jonathan P Stoye
- Retrovirus-Host Interactions, The Francis Crick Institute, London, UK .,Department of Medicine, Faculty of Medicine, Imperial College London, London, UK
| |
Collapse
|
|
30
|
Rajagopalan D, Jha S. An epi(c)genetic war: Pathogens, cancer and human genome. Biochim Biophys Acta Rev Cancer 2018; 1869:333-345. [DOI: 10.1016/j.bbcan.2018.04.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 03/22/2018] [Accepted: 04/09/2018] [Indexed: 02/08/2023]
|
|
31
|
Gröger V, Cynis H. Human Endogenous Retroviruses and Their Putative Role in the Development of Autoimmune Disorders Such as Multiple Sclerosis. Front Microbiol 2018; 9:265. [PMID: 29515547 PMCID: PMC5826199 DOI: 10.3389/fmicb.2018.00265] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 02/05/2018] [Indexed: 12/13/2022] Open
Abstract
Human endogenous retroviruses (HERVs) are remnants of retroviral germ line infections of human ancestors and make up ~8% of the human genome. Under physiological conditions, these elements are frequently inactive or non-functional due to deactivating mutations and epigenetic control. However, they can be reactivated under certain pathological conditions and produce viral transcripts and proteins. Several disorders, like multiple sclerosis or amyotrophic lateral sclerosis are associated with increased HERV expression. Although their detailed contribution to individual diseases has yet to be elucidated, an increasing number of studies in vitro and in vivo suggest HERVs as potent modulators of the immune system. They are able to affect the transcription of other immune-related genes, interact with pattern recognition receptors, and influence the positive and negative selection of developing thymocytes. Interestingly, HERV envelope proteins can both stimulate and suppress immune responses based on different mechanisms. In the light of HERV proteins becoming an emerging drug target for autoimmune-related disorders and cancer, we will provide an overview on recent findings of the complex interactions between HERVs and the human immune system with a focus on autoimmunity.
Collapse
Affiliation(s)
| | - Holger Cynis
- Department of Drug Design and Target Validation, Fraunhofer Institute for Cell Therapy and Immunology, Halle, Germany
| |
Collapse
|
|
32
|
Giebler M, Staege MS, Blauschmidt S, Ohm LI, Kraus M, Würl P, Taubert H, Greither T. Elevated HERV-K Expression in Soft Tissue Sarcoma Is Associated with Worsened Relapse-Free Survival. Front Microbiol 2018; 9:211. [PMID: 29487589 PMCID: PMC5816752 DOI: 10.3389/fmicb.2018.00211] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/30/2018] [Indexed: 01/22/2023] Open
Abstract
A wide variety of endogenous retroviral sequences has been demonstrated in the human genome so far, divided into several different families according to the sequence homology to viral strains. While increased expression of human endogenous retrovirus (HERV) elements has already been linked to unfavorable prognosis in hepatocellular carcinoma, breast cancer, and ovarian carcinoma yet less is known about the impact of the expression of different HERV elements on sarcomagenesis in general as well as the outcome of soft tissue sarcoma (STS) patients. Therefore, in this study the association between expression of HERV-K and HERV-F and the clinicopathological characteristics in a cohort of STSs as well as the patients’ prognosis was evaluated. HERV-K and HERV-F expression was assessed by quantitative real-time PCR in 120 patient specimens. HERV-K and HERV-F expression was significantly correlated (rS = 0.5; p = 6.4 × 10-9; Spearman’s rank bivariate correlation). Also, tumor diameter exhibited a significant negative association to HERV-K and HERV-F expression. Levels of several hypoxia-related RNAs like HIF-1α and miR-210 showed a significant positive correlation with both HERV-K and HERV-F expression. Although in survival analyses no impact of HERV expression on disease-specific survival could be detected, patients with elevated HERV-K expression had a significantly shorter relapse-free survival (p = 0.014, log-rank analysis). In conclusion, we provide evidence for the first time that the increased expression of HERV-K in tumors is associated with STS patients’ prognosis.
Collapse
Affiliation(s)
- Maria Giebler
- Center for Reproductive Medicine and Andrology, Martin Luther University of Halle-Wittenberg, Halle, Germany
| | - Martin S Staege
- Department of Pediatrics I, Martin Luther University of Halle-Wittenberg, Halle, Germany
| | - Sindy Blauschmidt
- Center for Reproductive Medicine and Andrology, Martin Luther University of Halle-Wittenberg, Halle, Germany
| | - Lea I Ohm
- Department of Pediatrics I, Martin Luther University of Halle-Wittenberg, Halle, Germany
| | - Matthias Kraus
- Center for Reproductive Medicine and Andrology, Martin Luther University of Halle-Wittenberg, Halle, Germany
| | - Peter Würl
- Department of General, Visceral and Thoracic Surgery, Städtische Klinikum Dessau, Dessau-Roßlau, Germany
| | - Helge Taubert
- Division Molecular Urology, Department of Urology and Pediatric Urology, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Thomas Greither
- Center for Reproductive Medicine and Andrology, Martin Luther University of Halle-Wittenberg, Halle, Germany
| |
Collapse
|
|
33
|
Ho XD, Nguyen HG, Trinh LH, Reimann E, Prans E, Kõks G, Maasalu K, Le VQ, Nguyen VH, Le NTN, Phung P, Märtson A, Lattekivi F, Kõks S. Analysis of the Expression of Repetitive DNA Elements in Osteosarcoma. Front Genet 2017; 8:193. [PMID: 29250102 PMCID: PMC5714928 DOI: 10.3389/fgene.2017.00193] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 11/15/2017] [Indexed: 02/05/2023] Open
Abstract
Osteosarcoma (OS) is a rare malignant bone tumor. It affects mostly young persons and has poor outcome with the present treatment. No improvement was observed since the introduction of chemotherapy. The better understanding of osteosarcoma development could indicate better management strategy. Repetitive DNA elements were found to play a role in cancer mechanism especially in epithelial tumors but not yet analyzed in osteosarcoma. We conducted the study to analyse the expression profile of repetitive elements (RE) in osteosarcoma. Methods: Fresh bone paired (tumor and normal bone) samples were obtained from excised parts of tumors of 18 patients with osteosarcoma. We performed sequencing of RNA extracted from 36 samples (18 tumor tissues and 18 normal bone for controls), mapped raw reads to the human genome and identified the REs. EdgeR package was used to analyse the difference in expression of REs between osteosarcoma and normal bone. Results: 82 REs were found differentially expressed (FDR < 0.05) between osteosarcoma and normal bone. Out of all significantly changed REs, 35 were upregulated and 47 were downregulated. HERVs (THE1C-int, LTR5, MER57F and MER87B) and satellite elements (HSATII, ALR-alpha) were the most significantly differential expressed elements between osteosarcoma and normal tissues. These results suggest significant impact of REs in the osteosarcoma. The role of REs should be further studied to understand the mechanism they have in the genesis of osteosarcoma.
Collapse
Affiliation(s)
- Xuan D Ho
- Department of Oncology, College of Medicine and Pharmacy, Hue University, Hue, Vietnam.,Department of Pathophysiology, University of Tartu, Tartu, Estonia
| | - Hoang G Nguyen
- Department of Oncology, Hanoi Medical University, Hanoi, Vietnam
| | - Le H Trinh
- Department of Oncology, Hanoi Medical University, Hanoi, Vietnam
| | - Ene Reimann
- Department of Pathophysiology, University of Tartu, Tartu, Estonia.,Department of Reproductive Biology, Estonian University of Life Sciences, Tartu, Estonia
| | - Ele Prans
- Department of Pathophysiology, University of Tartu, Tartu, Estonia
| | - Gea Kõks
- Department of Pathophysiology, University of Tartu, Tartu, Estonia
| | - Katre Maasalu
- Department of Traumatology and Orthopedics, University of Tartu, Tartu, Estonia.,Clinic of Traumatology and Orthopaedics of Tartu University Hospital, Tartu, Estonia
| | - Van Q Le
- Department of Oncology, Hanoi Medical University, Hanoi, Vietnam
| | - Van H Nguyen
- Department of Oncology, Hanoi Medical University, Hanoi, Vietnam
| | - Nghi T N Le
- Department of Orthopedics, College of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Phuong Phung
- Department of Oncology, College of Medicine and Pharmacy, Hue University, Hue, Vietnam
| | - Aare Märtson
- Department of Traumatology and Orthopedics, University of Tartu, Tartu, Estonia.,Clinic of Traumatology and Orthopaedics of Tartu University Hospital, Tartu, Estonia
| | - Freddy Lattekivi
- Department of Pathophysiology, University of Tartu, Tartu, Estonia
| | - Sulev Kõks
- Department of Pathophysiology, University of Tartu, Tartu, Estonia.,Department of Reproductive Biology, Estonian University of Life Sciences, Tartu, Estonia
| |
Collapse
|
|
34
|
Grandi N, Cadeddu M, Pisano MP, Esposito F, Blomberg J, Tramontano E. Identification of a novel HERV-K(HML10): comprehensive characterization and comparative analysis in non-human primates provide insights about HML10 proviruses structure and diffusion. Mob DNA 2017; 8:15. [PMID: 29118853 PMCID: PMC5667498 DOI: 10.1186/s13100-017-0099-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 10/24/2017] [Indexed: 11/23/2022] Open
Abstract
Background About half of the human genome is constituted of transposable elements, including human endogenous retroviruses (HERV). HERV sequences represent the 8% of our genetic material, deriving from exogenous infections occurred millions of years ago in the germ line cells and being inherited by the offspring in a Mendelian fashion. HERV-K elements (classified as HML1–10) are among the most studied HERV groups, especially due to their possible correlation with human diseases. In particular, the HML10 group was reported to be upregulated in persistent HIV-1 infected cells as well as in tumor cells and samples, and proposed to have a role in the control of host genes expression. An individual HERV-K(HML10) member within the major histocompatibility complex C4 gene has even been studied for its possible contribution to type 1 diabetes susceptibility. Following a first characterization of the HML10 group at the genomic level, performed with the innovative software RetroTector, we have characterized in detail the 8 previously identified HML10 sequences present in the human genome, and an additional HML10 partial provirus in chromosome 1p22.2 that is reported here for the first time. Results Using a combined approach based on RetroTector software and a traditional Genome Browser Blat search, we identified a novel HERV-K(HML10) sequence in addition to the eight previously reported in the human genome GRCh37/hg19 assembly. We fully characterized the nine HML10 sequences at the genomic level, including their classification in two types based on both structural and phylogenetic characteristics, a detailed analysis of each HML10 nucleotide sequence, the first description of the presence of an Env Rec domain in the type II HML10, the estimated time of integration of individual members and the comparative map of the HML10 proviruses in non-human primates. Conclusions We performed an unambiguous and exhaustive analysis of the nine HML10 sequences present in GRCh37/hg19 assembly, useful to increase the knowledge of the group’s contribution to the human genome and laying the foundation for a better understanding of the potential physiological effects and the tentative correlation of these sequences with human pathogenesis. Electronic supplementary material The online version of this article (10.1186/s13100-017-0099-7) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Nicole Grandi
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Marta Cadeddu
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Maria Paola Pisano
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Francesca Esposito
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy
| | - Jonas Blomberg
- Department of Medical Sciences, Uppsala University, Uppsala, Sweden
| | - Enzo Tramontano
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy.,Istituto di Ricerca Genetica e Biomedica, Consiglio Nazionale delle Ricerche (CNR), Monserrato, Cagliari, Italy
| |
Collapse
|
|
35
|
Spontaneous regression of malignant melanoma - is it based on the interplay between host immune system and melanoma antigens? Anticancer Drugs 2017; 28:819-830. [DOI: 10.1097/cad.0000000000000526] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|
|
36
|
Retroviral envelope proteins: Involvement in neuropathogenesis. J Neurol Sci 2017; 380:151-163. [DOI: 10.1016/j.jns.2017.07.027] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 06/23/2017] [Accepted: 07/18/2017] [Indexed: 02/07/2023]
|
|
37
|
Schulz WA. Does HERV-K represent a potential therapeutic target for prostate cancer? Expert Opin Ther Targets 2017; 21:921-924. [PMID: 28847189 DOI: 10.1080/14728222.2017.1373095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Wolfgang A Schulz
- a Department of Urology, Medical Faculty , Heinrich Heine University , Düsseldorf , Germany
| |
Collapse
|
|
38
|
Li M, Radvanyi L, Yin B, Rycaj K, Li J, Chivukula R, Lin K, Lu Y, Shen J, Chang DZ, Li D, Johanning GL, Wang-Johanning F. Downregulation of Human Endogenous Retrovirus Type K (HERV-K) Viral env RNA in Pancreatic Cancer Cells Decreases Cell Proliferation and Tumor Growth. Clin Cancer Res 2017; 23:5892-5911. [PMID: 28679769 DOI: 10.1158/1078-0432.ccr-17-0001] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 05/09/2017] [Accepted: 06/29/2017] [Indexed: 12/23/2022]
Abstract
Purpose: We investigated the role of the human endogenous retrovirus type K (HERV-K) envelope (env) gene in pancreatic cancer.Experimental Design: shRNA was employed to knockdown (KD) the expression of HERV-K in pancreatic cancer cells.Results: HERV-K env expression was detected in seven pancreatic cancer cell lines and in 80% of pancreatic cancer patient biopsies, but not in two normal pancreatic cell lines or uninvolved normal tissues. A new HERV-K splice variant was discovered in several pancreatic cancer cell lines. Reverse transcriptase activity and virus-like particles were observed in culture media supernatant obtained from Panc-1 and Panc-2 cells. HERV-K viral RNA levels and anti-HERV-K antibody titers were significantly higher in pancreatic cancer patient sera (N = 106) than in normal donor sera (N = 40). Importantly, the in vitro and in vivo growth rates of three pancreatic cancer cell lines were significantly reduced after HERV-K KD by shRNA targeting HERV-K env, and there was reduced metastasis to lung after treatment. RNA-Seq results revealed changes in gene expression after HERV-K env KD, including RAS and TP53. Furthermore, downregulation of HERV-K Env protein expression by shRNA also resulted in decreased expression of RAS, p-ERK, p-RSK, and p-AKT in several pancreatic cancer cells or tumors.Conclusions: These results demonstrate that HERV-K influences signal transduction via the RAS-ERK-RSK pathway in pancreatic cancer. Our data highlight the potentially important role of HERV-K in tumorigenesis and progression of pancreatic cancer, and indicate that HERV-K viral proteins may be attractive biomarkers and/or tumor-associated antigens, as well as potentially useful targets for detection, diagnosis, and immunotherapy of pancreatic cancer. Clin Cancer Res; 23(19); 5892-911. ©2017 AACR.
Collapse
Affiliation(s)
- Ming Li
- Viral Oncology Program, Center for Cancer and Metabolism, SRI International, Menlo Park, California
| | - Laszlo Radvanyi
- EMD Serono Research and Development Institute, Billerica, Massachusetts
| | - Bingnan Yin
- Department of Inflammation and Epigenetics, Methodist Research Institute, Houston, Texas
| | | | - Jia Li
- Viral Oncology Program, Center for Cancer and Metabolism, SRI International, Menlo Park, California
| | - Raghavender Chivukula
- Viral Oncology Program, Center for Cancer and Metabolism, SRI International, Menlo Park, California
| | - Kevin Lin
- Department of Epigenetics and Molecular Carcinogenesis, Science Park, the University of Texas MD Anderson Cancer Center, Smithville, Texas
| | - Yue Lu
- Department of Epigenetics and Molecular Carcinogenesis, Science Park, the University of Texas MD Anderson Cancer Center, Smithville, Texas
| | - JianJun Shen
- Department of Epigenetics and Molecular Carcinogenesis, Science Park, the University of Texas MD Anderson Cancer Center, Smithville, Texas
| | - David Z Chang
- Virginia Oncology Associates, Newport News, Virginia
| | - Donghui Li
- Department of Gastrointestinal Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Gary L Johanning
- Viral Oncology Program, Center for Cancer and Metabolism, SRI International, Menlo Park, California
| | - Feng Wang-Johanning
- Viral Oncology Program, Center for Cancer and Metabolism, SRI International, Menlo Park, California.
| |
Collapse
|
|
39
|
Argaw-Denboba A, Balestrieri E, Serafino A, Cipriani C, Bucci I, Sorrentino R, Sciamanna I, Gambacurta A, Sinibaldi-Vallebona P, Matteucci C. HERV-K activation is strictly required to sustain CD133+ melanoma cells with stemness features. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2017; 36:20. [PMID: 28125999 PMCID: PMC5270369 DOI: 10.1186/s13046-016-0485-x] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 12/27/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND Melanoma is a heterogeneous tumor in which phenotype-switching and CD133 marker have been associated with metastasis promotion and chemotherapy resistance. CD133 positive (CD133+) subpopulation has also been suggested as putative cancer stem cell (CSC) of melanoma tumor. Human endogenous retrovirus type K (HERV-K) has been described to be aberrantly activated during melanoma progression and implicated in the etiopathogenesis of disease. Earlier, we reported that stress-induced HERV-K activation promotes cell malignant transformation and reduces the immunogenicity of melanoma cells. Herein, we investigated the correlation between HERV-K and the CD133+ melanoma cells during microenvironmental modifications. METHODS TVM-A12 cell line, isolated in our laboratory from a primary human melanoma lesion, and other commercial melanoma cell lines (G-361, WM-115, WM-266-4 and A375) were grown and maintained in the standard and stem cell media. RNA interference, Real-time PCR, flow cytometry analysis, self-renewal and migration/invasion assays were performed to characterize cell behavior and HERV-K expression. RESULTS Melanoma cells, exposed to stem cell media, undergo phenotype-switching and expansion of CD133+ melanoma cells, concomitantly promoted by HERV-K activation. Notably, the sorted CD133+ subpopulation showed stemness features, characterized by higher self-renewal ability, embryonic genes expression, migration and invasion capacities compared to the parental cell line. RNA interference-mediated downregulation experiments showed that HERV-K has a decisive role to expand and maintain the CD133+ melanoma subpopulation during microenvironmental modifications. Similarly, non nucleoside reverse transcriptase inhibitors (NNRTIs) efavirenz and nevirapine were effective to restrain the activation of HERV-K in melanoma cells, to antagonize CD133+ subpopulation expansion and to induce selective high level apoptosis in CD133+ cells. CONCLUSIONS HERV-K activation promotes melanoma cells phenotype-switching and is strictly required to expand and maintain the CD133+ melanoma cells with stemness features in response to microenvironmental modifications.
Collapse
Affiliation(s)
- Ayele Argaw-Denboba
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy
| | - Emanuela Balestrieri
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy
| | - Annalucia Serafino
- Institute of Translational Pharmacology, National Research Council, Via Fosso del Cavaliere 100, 00133, Rome, Italy
| | - Chiara Cipriani
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy
| | - Ilaria Bucci
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy
| | - Roberta Sorrentino
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy
| | - Ilaria Sciamanna
- S.B.G.S.A. Istituto Superiore di Sanità (Italian National Institute of Health), Viale Regina Elena 299, 00161, Rome, Italy
| | - Alessandra Gambacurta
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy
| | - Paola Sinibaldi-Vallebona
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy.,Institute of Translational Pharmacology, National Research Council, Via Fosso del Cavaliere 100, 00133, Rome, Italy
| | - Claudia Matteucci
- Department of Experimental Medicine and Surgery, University of Rome "Tor Vergata", Via Montpellier 1, 00133, Rome, Italy.
| |
Collapse
|
|
40
|
Human Endogenous Retroviruses-K (HML-2) Expression Is Correlated with Prognosis and Progress of Hepatocellular Carcinoma. BIOMED RESEARCH INTERNATIONAL 2016; 2016:8201642. [PMID: 28070518 PMCID: PMC5192314 DOI: 10.1155/2016/8201642] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Revised: 11/07/2016] [Accepted: 11/22/2016] [Indexed: 12/14/2022]
Abstract
Background. The association between human endogenous retroviruses-K (HERV-K) (HML-2) and human disease, including a variety of cancers, has been indicated. However, the function of HERV-K (HML-2) in the progression of hepatocellular carcinoma (HCC) still remains largely unclear. Methods. We detected the expression of HERV-K (HML-2) in 84 HCC tissues and adjacent nontumor tissues by quantitative real-time PCR (qRT-PCR) and analyzed its correlation with the clinical parameters. Result. The HEVR-K level was significantly increased in HCC compared with adjacent normal tissues (P < 0.01) which was proved to be significantly associated with cirrhosis (P < 0.05), tumor differentiation (P < 0.05), and TNM stage (P < 0.05). Moreover, the high expression of HERV-K (HML-2) had a poorer overall survival than patients with lower expression by a Kaplan-Meier survival analysis (P < 0.01). The multivariate Cox regression analysis indicated that the level of HERV-K (HML-2) was an independent prognostic factor for the overall survival rate of HCC patients. Receiver operating characteristic (ROC) curves demonstrated the diagnostic accuracy of HERV-K (HML-2) expression in HCC (AUC = 0.729, 74.7% sensitivity, and 67.8% specificity). Conclusions. Our results suggested that upregulation of HERV-K (HML-2) in HCC patients was significantly related to cancer progression and poor outcome, indicating that HERV-K (HML-2) might be a novel candidate prognostic biomarker for HCC.
Collapse
|
|
41
|
Kozlov AP. Expression of evolutionarily novel genes in tumors. Infect Agent Cancer 2016; 11:34. [PMID: 27437030 PMCID: PMC4949931 DOI: 10.1186/s13027-016-0077-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 05/18/2016] [Indexed: 01/29/2023] Open
Abstract
The evolutionarily novel genes originated through different molecular mechanisms are expressed in tumors. Sometimes the expression of evolutionarily novel genes in tumors is highly specific. Moreover positive selection of many human tumor-related genes in primate lineage suggests their involvement in the origin of new functions beneficial to organisms. It is suggested to consider the expression of evolutionarily young or novel genes in tumors as a new biological phenomenon, a phenomenon of TSEEN (tumor specifically expressed, evolutionarily novel) genes.
Collapse
Affiliation(s)
- A. P. Kozlov
- The Biomedical Center and Peter the Great St. Petersburg Polytechnic University, St. Petersburg, Russia
| |
Collapse
|
|
42
|
Trela M, Nelson PN, Rylance PB. The role of molecular mimicry and other factors in the association of Human Endogenous Retroviruses and autoimmunity. APMIS 2016; 124:88-104. [PMID: 26818264 DOI: 10.1111/apm.12487] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 10/26/2015] [Indexed: 02/02/2023]
Abstract
Human Endogenous Retroviruses (HERVs) have been implicated in autoimmune and other diseases. Molecular mimicry has been postulated as a potential mechanism of autoimmunity. Exogenous viruses have also been reported to be associated with the same diseases, as have genetic and environmental factors. If molecular mimicry were to be shown to be an initiating mechanism of some autoimmune diseases, then therapeutic options of blocking antibodies and peptides might be of benefit in halting diseases at the outset. Bioinformatic and molecular modelling techniques have been employed to investigate molecular mimicry and the evidence for the association of HERVs and autoimmunity is reviewed. The most convincing evidence for molecular mimicry is in rheumatoid arthritis, where HERV K-10 shares amino acid sequences with IgG1Fc, a target for rheumatoid factor. Systemic lupus erythematosus is an example of a condition associated with several autoantibodies, and several endogenous and exogenous viruses have been reported to be associated with the disease. The lack of a clear link between one virus and this condition, and the spectrum of clinical manifestations, suggests that genetic, environmental and the inflammatory response to a virus or viruses might also be major factors in the pathogenesis of lupus and other autoimmune conditions. Where there are strong associations between a virus and an autoimmune condition, such as in hepatitis C and cryoglobulinaemia, the use of bioinformatics and molecular modelling can also be utilized to help to understand the role of molecular mimicry in how HERVs might trigger disease.
Collapse
Affiliation(s)
- Malgorzata Trela
- Immunology Research Group, Research Institute in Healthcare Sciences, University of Wolverhampton, Wolverhampton, UK
| | - Paul N Nelson
- Immunology Research Group, Research Institute in Healthcare Sciences, University of Wolverhampton, Wolverhampton, UK
| | - Paul B Rylance
- Royal Wolverhampton NHS Trust, New Cross Hospital, Wolverhampton, UK
| |
Collapse
|
|
43
|
Hanke K, Hohn O, Bannert N. HERV-K(HML-2), a seemingly silent subtenant - but still waters run deep. APMIS 2016; 124:67-87. [PMID: 26818263 DOI: 10.1111/apm.12475] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 10/12/2015] [Indexed: 01/26/2023]
Abstract
A large proportion of the human genome consists of endogenous retroviruses, some of which are well preserved, showing transcriptional activity, and expressing retroviral proteins. The HERV-K(HML-2) family represents the most intact members of these elements, with some having open and intact reading frames for viral proteins and the ability to form virus-like particles. Although generally suppressed in most healthy tissues by a variety of epigenetic processes and antiviral mechanisms, there is evidence that some members of this family are (at least partly) still active - particularly in certain stem cells and various tumors. This raises the possibility of their involvement in tumor induction or in developmental processes. In recent years, many new insights into this fascinating field have been attained, and this review focuses on new discoveries about coevolutionary events and intracellular defense mechanisms against HERV-K(HML-2) activity. We also describe what might occur when these mechanisms fail or become modulated by viral proteins or other viruses and discuss the new vistas opened up by the reconstitution of ancestral viral proteins and even complete HML-2 viruses.
Collapse
Affiliation(s)
- Kirsten Hanke
- Department HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany
| | - Oliver Hohn
- Department HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany
| | - Norbert Bannert
- Department HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany
| |
Collapse
|
|
44
|
Activation of endogenous human stem cell-associated retroviruses (SCARs) and therapy-resistant phenotypes of malignant tumors. Cancer Lett 2016; 376:347-59. [PMID: 27084523 DOI: 10.1016/j.canlet.2016.04.014] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 04/08/2016] [Accepted: 04/10/2016] [Indexed: 02/04/2023]
Abstract
Recent reports revealed consistent activation of specific endogenous retroviral elements in human preimplantation embryos and embryonic stem cells. Activity of stem cell associated retroviruses (SCARs) has been implicated in seeding thousands of human-specific regulatory sequences in the hESC genome. Activation of specific SCARs has been demonstrated in patients diagnosed with multiple types of cancer, autoimmune diseases, and neurodegenerative disorders, and appears associated with clinically lethal therapy resistant death-from-cancer phenotypes in a sub-set of cancer patients diagnosed with different types of malignant tumors. A hallmark feature of human-specific SCAR integration sites is deletions of ancestral DNA. Analysis of human-specific genetic loci of SCARs' stemness networks in tumor samples of TCGA cohorts representing 29 cancer types suggests that this approach may facilitate identification of pan-cancer genomic signatures of clinically-lethal disease defined by the presence of somatic non-silent mutations, gene-level copy number changes, and transcripts and proteins' expression of SCAR-regulated host genes. Present analyses indicate that multiple lines of strong circumstantial evidence support the hypothesis that activation of SCARs' networks may play an important role in cancer progression and metastasis, perhaps contributing to the emergence of clinically-lethal therapy-resistant death-from-cancer phenotypes.
Collapse
|
|
45
|
Vargiu L, Rodriguez-Tomé P, Sperber GO, Cadeddu M, Grandi N, Blikstad V, Tramontano E, Blomberg J. Classification and characterization of human endogenous retroviruses; mosaic forms are common. Retrovirology 2016; 13:7. [PMID: 26800882 PMCID: PMC4724089 DOI: 10.1186/s12977-015-0232-y] [Citation(s) in RCA: 175] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 12/16/2015] [Indexed: 02/06/2023] Open
Abstract
Background Human endogenous retroviruses (HERVs) represent the inheritance of ancient germ-line cell infections by exogenous retroviruses and the subsequent transmission of the integrated proviruses to the descendants. ERVs have the same internal structure as exogenous retroviruses. While no replication-competent HERVs have been recognized, some retain up to three of four intact ORFs. HERVs have been classified before, with varying scope and depth, notably in the RepBase/RepeatMasker system. However, existing classifications are bewildering. There is a need for a systematic, unifying and simple classification. We strived for a classification which is traceable to previous classifications and which encompasses HERV variation within a limited number of clades. Results The human genome assembly GRCh 37/hg19 was analyzed with RetroTector, which primarily detects relatively complete Class I and II proviruses. A total of 3173 HERV sequences were identified. The structure of and relations between these proviruses was resolved through a multi-step classification procedure that involved a novel type of similarity image analysis (“Simage”) which allowed discrimination of heterogeneous (noncanonical) from homogeneous (canonical) HERVs. Of the 3173 HERVs, 1214 were canonical and segregated into 39 canonical clades (groups), belonging to class I (Gamma- and Epsilon-like), II (Beta-like) and III (Spuma-like). The groups were chosen based on (1) sequence (nucleotide and Pol amino acid), similarity, (2) degree of fit to previously published clades, often from RepBase, and (3) taxonomic markers. The groups fell into 11 supergroups. The 1959 noncanonical HERVs contained 31 additional, less well-defined groups. Simage analysis revealed several types of mosaicism, notably recombination and secondary integration. By comparing flanking sequences, LTRs and completeness of gene structure, we deduced that some noncanonical HERVs proliferated after the recombination event. Groups were further divided into envelope subgroups (altogether 94) based on sequence similarity and characteristic “immunosuppressive domain” motifs. Intra and inter(super)group, as well as intraclass, recombination involving envelope genes (“env snatching”) was a common event. LTR divergence indicated that HERV-K(HML2) and HERVFC had the most recent integrations, HERVL and HUERSP3 the oldest. Conclusions A comprehensive HERV classification and characterization approach was undertaken. It should be applicable for classification of all ERVs. Recombination was common among HERV ancestors. Electronic supplementary material The online version of this article (doi:10.1186/s12977-015-0232-y) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Laura Vargiu
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy. .,Center for Advanced Studies, Research and Development in Sardinia, CRS4, Pula, Italy. .,Nurideas S.r.l., Cagliari, Italy.
| | - Patricia Rodriguez-Tomé
- Center for Advanced Studies, Research and Development in Sardinia, CRS4, Pula, Italy. .,Nurideas S.r.l., Cagliari, Italy.
| | - Göran O Sperber
- Physiology Unit, Department of Neuroscience, Uppsala University, Uppsala, Sweden.
| | - Marta Cadeddu
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy.
| | - Nicole Grandi
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy.
| | - Vidar Blikstad
- Department of Medical Sciences, Uppsala University Hospital, Dag Hammarskjölds Väg 17, Uppsala, 751 85, Sweden.
| | - Enzo Tramontano
- Department of Life and Environmental Sciences, University of Cagliari, Cagliari, Italy.
| | - Jonas Blomberg
- Department of Medical Sciences, Uppsala University Hospital, Dag Hammarskjölds Väg 17, Uppsala, 751 85, Sweden.
| |
Collapse
|
|
46
|
Gonzalez-Cao M, Iduma P, Karachaliou N, Santarpia M, Blanco J, Rosell R. Human endogenous retroviruses and cancer. Cancer Biol Med 2016; 13:483-488. [PMID: 28154780 PMCID: PMC5250606 DOI: 10.20892/j.issn.2095-3941.2016.0080] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Human endogenous retroviruses (HERVs) are retroviruses that infected human genome millions of years ago and have persisted throughout human evolution. About 8% of our genome is composed of HERVs, most of which are nonfunctional because of epigenetic control or deactivating mutations. However, a correlation between HERVs and human cancer has been described and many tumors, such as melanoma, breast cancer, germ cell tumors, renal cancer or ovarian cancer, express HERV proteins, mainly HERV-K (HML6) and HERV-K (HML2). Although the causative role of HERVs in cancer is controversial, data from animal models demonstrated that endogenous retroviruses are potentially oncogenic. HERV protein expression in human cells generates an immune response by activating innate and adaptive immunities. Some HERV-derived peptides have antigenic properties. For example, HERV-K (HML-6) encodes the HER-K MEL peptide recognized by CD8+ lymphocytes. In addition, HERVs are two-edged immunomodulators. HERVs show immunosuppressive activity. The presence of genomic retroviral elements in host-cell cytosol may activate an interferon type I response. Therefore, targeting HERVs through cellular vaccines or immunomodulatory drugs combined with checkpoint inhibitors is attracting interest because they could be active in human tumors.
Collapse
Affiliation(s)
- María Gonzalez-Cao
- Translational Cancer Research Unit, Instituto Oncológico Dr Rosell, Quirón Dexeus University Hospital, Barcelona 08028, Spain
| | - Paola Iduma
- AIDS Research Institute, Hospital Universitari Germans Trias i Pujol, Badalona 08028, Spain
| | - Niki Karachaliou
- Translational Cancer Research Unit, Instituto Oncológico Dr Rosell, Quirón Dexeus University Hospital, Barcelona 08028, Spain
| | - Mariacarmela Santarpia
- Medical Oncology Unit, Human Pathology Department, University of Messina, Messina, 98122, Italy
| | - Julià Blanco
- AIDS Research Institute, Hospital Universitari Germans Trias i Pujol, Badalona 08028, Spain; UVIC-UCC, Catalunya 08500, Spain
| | - Rafael Rosell
- Translational Cancer Research Unit, Instituto Oncológico Dr Rosell, Quirón Dexeus University Hospital, Barcelona 08028, Spain; Cancer Biology & Precision Medicine Program, Catalan Institute of Oncology, Germans Trias I Pujol Health Sciences Institute and Hospital, Campus Can Ruti, Badalona, 08916, Spain; Fundación Molecular Oncology Research, Barcelona 08028, Spain
| |
Collapse
|
|
47
|
Mucke HA. Drug Repurposing Patent Applications April–June 2015. Assay Drug Dev Technol 2015; 13:654-60. [DOI: 10.1089/adt.2015.29030.pq2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
|
48
|
Nadeau MJ, Manghera M, Douville RN. Inside the Envelope: Endogenous Retrovirus-K Env as a Biomarker and Therapeutic Target. Front Microbiol 2015; 6:1244. [PMID: 26617584 PMCID: PMC4643131 DOI: 10.3389/fmicb.2015.01244] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 10/26/2015] [Indexed: 11/27/2022] Open
Abstract
Due to multiple ancestral human retroviral germ cell infections, the modern human genome is strewn with relics of these infections, termed endogenous retroviruses (ERVs). ERV expression has been silenced due to negative selective pressures and genetic phenomena such as mutations and epigenetic silencing. Nonetheless, select ERVs have retained the capacity to be damaging to their host when reawakened. Much of the current research on the ERVK Env protein strongly suggests a causal or contributive role in the pathogenesis of various cancers, autoimmune and infectious diseases. Additionally, there is a small body of research suggesting that ERVK Env has been domesticated for use in placental development, akin to the ERVW syncytin. Though much is left to ascertain, the innate immune response to ERVK Env expression has been partially characterized and appears to be due to a region located in the transmembrane domain of the Env protein. In this review, we aim to highlight ERVK Env as a biomarker for inflammatory conditions and explore its use as a future therapeutic target for cancers, HIV infection and neurological disease.
Collapse
Affiliation(s)
- Marie-Josée Nadeau
- Douville Lab, Department of Biology, University of Winnipeg Winnipeg, MB, Canada
| | - Mamneet Manghera
- Douville Lab, Department of Biology, University of Winnipeg Winnipeg, MB, Canada ; Department of Immunology, University of Manitoba Winnipeg, MB, Canada
| | - Renée N Douville
- Douville Lab, Department of Biology, University of Winnipeg Winnipeg, MB, Canada ; Department of Immunology, University of Manitoba Winnipeg, MB, Canada
| |
Collapse
|
|
49
|
Bhardwaj N, Coffin JM. Endogenous retroviruses and human cancer: is there anything to the rumors? Cell Host Microbe 2014; 15:255-9. [PMID: 24629332 DOI: 10.1016/j.chom.2014.02.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Xenotropic murine leukemia virus-related virus (XMRV) infection was incorrectly associated with prostate cancer and chronic fatigue syndrome (CFS) in recent years. In this forum, we discuss the story of XMRV and how we can apply lessons learned here to inform the debate surrounding cancers associated with human endogenous retroviruses (HERVs).
Collapse
Affiliation(s)
- Neeru Bhardwaj
- Department of Molecular Biology and Microbiology, Graduate Program in Molecular Microbiology, Sackler School of Graduate Biomedical Sciences, Tufts University, 136 Harrison Avenue, Boston, MA 02111, USA
| | - John M Coffin
- Department of Molecular Biology and Microbiology, Graduate Program in Molecular Microbiology, Sackler School of Graduate Biomedical Sciences, Tufts University, 136 Harrison Avenue, Boston, MA 02111, USA.
| |
Collapse
|
|
50
|
Abu N, Akhtar MN, Yeap SK, Lim KL, Ho WY, Zulfadli AJ, Omar AR, Sulaiman MR, Abdullah MP, Alitheen NB. Flavokawain A induces apoptosis in MCF-7 and MDA-MB231 and inhibits the metastatic process in vitro. PLoS One 2014; 9:e105244. [PMID: 25286005 PMCID: PMC4186755 DOI: 10.1371/journal.pone.0105244] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 07/21/2014] [Indexed: 12/13/2022] Open
Abstract
INTRODUCTION The kava-kava plant (Piper methsyticum) is traditionally known as the pacific elixir by the pacific islanders for its role in a wide range of biological activities. The extract of the roots of this plant contains a variety of interesting molecules including Flavokawain A and this molecule is known to have anti-cancer properties. Breast cancer is still one of the leading diagnosed cancers in women today. The metastatic process is also very pertinent in the progression of tumorigenesis. METHODS MCF-7 and MDA-MB231 cells were treated with several concentrations of FKA. The apoptotic analysis was done through the MTT assay, BrdU assay, Annexin V analysis, cell cycle analysis, JC-1 mitochondrial dye, AO/PI dual staining, caspase 8/9 fluorometric assay, quantitative real time PCR and western blot. For the metastatic assays, the in vitro scratch assay, trans-well migration/invasion assay, HUVEC tube formation assay, ex vivo rat aortic ring assay, quantitative real time PCR and western blot were employed. RESULTS We have investigated the effects of FKA on the apoptotic and metastatic process in two breast cancer cell lines. FKA induces apoptosis in both MCF-7 and MDA-MB231 in a dose dependent manner through the intrinsic mitochondrial pathway. Additionally, FKA selectively induces a G2/M arrest in the cell cycle machinery of MDA-MB231 and G1 arrest in MCF-7. This suggests that FKA's anti-cancer activity is dependent on the p53 status. Moreover, FKA also halted the migration and invasion process in MDA-MB231. The similar effects can be seen in the inhibition of the angiogenesis process as well. CONCLUSIONS FKA managed to induce apoptosis and inhibit the metastatic process in two breast cancer cell lines, in vitro. Overall, FKA may serve as a promising candidate in the search of a new anti-cancer drug especially in halting the metastatic process but further in vivo evidence is needed.
Collapse
Affiliation(s)
- Nadiah Abu
- Bright Sparks Unit, Universiti Malaya, Kuala Lumpur, Malaysia
- Faculty of Biotechnology and Bimolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor Darul Ehsan, Malaysia
| | - M. Nadeem Akhtar
- Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, Kuantan, Pahang, Malaysia
| | - Swee Keong Yeap
- Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor Darul Ehsan, Malaysia
| | - Kian Lam Lim
- Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, Cheras, Selangor, Malaysia
| | - Wan Yong Ho
- School of Biomedical Sciences, University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
| | - Aimi Jamil Zulfadli
- Faculty of Biotechnology and Bimolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor Darul Ehsan, Malaysia
| | - Abdul Rahman Omar
- Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor Darul Ehsan, Malaysia
| | - Mohd Roslan Sulaiman
- Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor Darul Ehsan, Malaysia
| | - Mohd Puad Abdullah
- Faculty of Biotechnology and Bimolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor Darul Ehsan, Malaysia
| | - Noorjahan Banu Alitheen
- Faculty of Biotechnology and Bimolecular Sciences, Universiti Putra Malaysia, Serdang, Selangor Darul Ehsan, Malaysia
| |
Collapse
|