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Going viral? Linking the etiology of human prostate cancer to the PCA 3 long noncoding RNA and oncogenic viruses
2017; Springer Nature; Volume: 9; Issue: 10 Linguagem: Inglês
10.15252/emmm.201708072
ISSN1757-4684
AutoresAndré A. Teixeira, Serena Marchiò, Emmanuel Dias‐Neto, Diana Noronha Nunes, Israel Tojal da Silva, Bryce Chackerian, Marc Barry, Richard C. Lauer, Ricardo J. Giordano, Richard L. Sidman, Cosette M. Wheeler, Webster K. Cavenee, Renata Pasqualini, Wadih Arap,
Tópico(s)Viral-associated cancers and disorders
ResumoOpinion27 July 2017Open Access Going viral? Linking the etiology of human prostate cancer to the PCA3 long noncoding RNA and oncogenic viruses Andre A Teixeira Andre A Teixeira University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, Brazil Search for more papers by this author Serena Marchiò Serena Marchiò orcid.org/0000-0001-8214-0776 University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Department of Oncology, University of Torino School of Medicine, Torino, TO, Italy Candiolo Cancer Institute-Fondazione del Piemonte per l'Oncologia (FPO), Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Candiolo, TO, Italy Search for more papers by this author Emmanuel Dias-Neto Emmanuel Dias-Neto orcid.org/0000-0001-5670-8559 Laboratory of Medical Genomics, A.C.Camargo Cancer Center, São Paulo, Brazil Laboratory of Neurosciences, Institute of Psychiatry, University of São Paulo, São Paulo, Brazil Search for more papers by this author Diana N Nunes Diana N Nunes Laboratory of Medical Genomics, A.C.Camargo Cancer Center, São Paulo, Brazil Search for more papers by this author Israel T da Silva Israel T da Silva Laboratory of Computational Biology, A.C.Camargo Cancer Center, São Paulo, Brazil Search for more papers by this author Bryce Chackerian Bryce Chackerian Department of Molecular Genetics and Microbiology, University of New Mexico, Albuquerque, NM, USA Search for more papers by this author Marc Barry Marc Barry University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Department of Pathology, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Richard C Lauer Richard C Lauer University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Ricardo J Giordano Ricardo J Giordano Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, Brazil Search for more papers by this author Richard L Sidman Richard L Sidman Department of Neurology, Harvard Medical School, Boston, MA, USA Search for more papers by this author Cosette M Wheeler Cosette M Wheeler University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Webster K Cavenee Webster K Cavenee Ludwig Institute for Cancer Research, University of California-San Diego, La Jolla, CA, USA Search for more papers by this author Renata Pasqualini Renata Pasqualini orcid.org/0000-0002-4155-9324 University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Wadih Arap Wadih Arap orcid.org/0000-0002-8686-4584 University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Andre A Teixeira Andre A Teixeira University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, Brazil Search for more papers by this author Serena Marchiò Serena Marchiò orcid.org/0000-0001-8214-0776 University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Department of Oncology, University of Torino School of Medicine, Torino, TO, Italy Candiolo Cancer Institute-Fondazione del Piemonte per l'Oncologia (FPO), Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Candiolo, TO, Italy Search for more papers by this author Emmanuel Dias-Neto Emmanuel Dias-Neto orcid.org/0000-0001-5670-8559 Laboratory of Medical Genomics, A.C.Camargo Cancer Center, São Paulo, Brazil Laboratory of Neurosciences, Institute of Psychiatry, University of São Paulo, São Paulo, Brazil Search for more papers by this author Diana N Nunes Diana N Nunes Laboratory of Medical Genomics, A.C.Camargo Cancer Center, São Paulo, Brazil Search for more papers by this author Israel T da Silva Israel T da Silva Laboratory of Computational Biology, A.C.Camargo Cancer Center, São Paulo, Brazil Search for more papers by this author Bryce Chackerian Bryce Chackerian Department of Molecular Genetics and Microbiology, University of New Mexico, Albuquerque, NM, USA Search for more papers by this author Marc Barry Marc Barry University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Department of Pathology, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Richard C Lauer Richard C Lauer University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Ricardo J Giordano Ricardo J Giordano Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, Brazil Search for more papers by this author Richard L Sidman Richard L Sidman Department of Neurology, Harvard Medical School, Boston, MA, USA Search for more papers by this author Cosette M Wheeler Cosette M Wheeler University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Webster K Cavenee Webster K Cavenee Ludwig Institute for Cancer Research, University of California-San Diego, La Jolla, CA, USA Search for more papers by this author Renata Pasqualini Renata Pasqualini orcid.org/0000-0002-4155-9324 University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Wadih Arap Wadih Arap orcid.org/0000-0002-8686-4584 University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA Search for more papers by this author Author Information Andre A Teixeira1,2,3,‡, Serena Marchiò1,2,4,5,‡, Emmanuel Dias-Neto6,7, Diana N Nunes6, Israel T da Silva8, Bryce Chackerian9, Marc Barry1,10, Richard C Lauer1,11, Ricardo J Giordano3, Richard L Sidman12, Cosette M Wheeler1,11, Webster K Cavenee13, Renata Pasqualini1,2,‡ and Wadih Arap1,11,‡ 1University of New Mexico Comprehensive Cancer Center, Albuquerque, NM, USA 2Division of Molecular Medicine, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA 3Department of Biochemistry, Chemistry Institute, University of São Paulo, São Paulo, Brazil 4Department of Oncology, University of Torino School of Medicine, Torino, TO, Italy 5Candiolo Cancer Institute-Fondazione del Piemonte per l'Oncologia (FPO), Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Candiolo, TO, Italy 6Laboratory of Medical Genomics, A.C.Camargo Cancer Center, São Paulo, Brazil 7Laboratory of Neurosciences, Institute of Psychiatry, University of São Paulo, São Paulo, Brazil 8Laboratory of Computational Biology, A.C.Camargo Cancer Center, São Paulo, Brazil 9Department of Molecular Genetics and Microbiology, University of New Mexico, Albuquerque, NM, USA 10Department of Pathology, University of New Mexico School of Medicine, Albuquerque, NM, USA 11Division of Hematology/Oncology, Department of Internal Medicine, University of New Mexico School of Medicine, Albuquerque, NM, USA 12Department of Neurology, Harvard Medical School, Boston, MA, USA 13Ludwig Institute for Cancer Research, University of California-San Diego, La Jolla, CA, USA ‡These authors contributed equally to this work ‡These authors contributed equally to this work EMBO Mol Med (2017)9:1327-1330https://doi.org/10.15252/emmm.201708072 PDFDownload PDF of article text and main figures. ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InMendeleyWechatReddit Figures & Info Prostate cancer, the most frequent type of cancer in men, is surpassed only by lung cancer in causing cancer-related death. Despite major progress in defining the mutational landscape of this tumor, its etiology remains obscure. The intronic long-noncoding RNA (lncRNA) PCA3 is a specific marker of prostate cancer that acts as a trans-dominant negative oncogene to down-regulate the tumor suppressor gene PRUNE2. The unusual genomic organization and sequence of PCA3 leads us to hypothesize that it was introduced into the human genome by an as-yet undefined oncogenic virus. We further suggest viral infection-related mechanisms as functional in PCA3 overexpression and involved in prostate cancer initiation and/or progression. This is supported by known links between viral infections and prostate cancer, and the lack of this tumor in other mammals despite its high incidence in humans. Finally, we suggest that genomic sequence-based approaches might help us uncover the potential role of viruses in prostate cancer etiology. Introduction: The curious case of PCA3 in prostate cancer The intronic lncRNA Prostate Cancer Antigen 3 (PCA3) is a highly specific biomarker: While only present at low levels in normal or benign hyperplastic prostate, its expression is increased up to 100-fold in about 95% of prostatic carcinomas (Schalken et al, 2003). Despite this strong correlation, the biological function of PCA3 remained elusive for almost two decades after its discovery (Bussemakers et al, 1999), until we established its role as a trans-dominant negative oncogene that downregulates a protein-coding tumor suppressor gene, prune homolog 2 (PRUNE2) (Salameh et al, 2015). In experimental models of human prostate cancer, PCA3 overexpression as well as PRUNE2 silencing accelerates the growth of tumor xenografts in vivo, while increasing cell proliferation, adhesion, and migration in vitro (Salameh et al, 2015). In prostate cancer patients, decreased levels of PRUNE2 are indicative of poor prognosis, as this is associated with metastatic disease (National Center for Biotechnology Information, Gene Expression Omnibus, NCBI GEO, profile 34856174; n = 171) and a high Gleason score (The Cancer Genome Atlas, TCGA; n = 497). Surprisingly, data retrieved from large-scale databases of human tissue samples (TCGA; and The Atlas of noncoding RNAs in Cancer, TANRIC) show homogeneous expression of PCA3 only in prostate cancer, but not in other tumor types, including those in which PRUNE2 loss-of-function events have been reported, that is, Merkel cell carcinoma, neuroblastoma, glioblastoma, and parathyroid carcinoma. From an evolutionary standpoint, PCA3 is a relatively new gene: All four exons and the upstream (putative promoter-containing) sequence are conserved among primates, but only exon 4 shares conservation with the rabbit (68% identity) and mouse (52% identity) orthologs. Prostate cancer occurrence is even more stringent than PCA3 conservation: Despite its high incidence in humans, it is rare or absent in other mammals (De Marzo et al, 1999), including nonhuman primates kept in captivity (ruling out the possibility that a shorter lifespan might account for the difference). Dogs are the only known exception, but even here the incidence is much lower than in humans. Moreover, while the vast majority of prostate cancers in men are androgen-dependent adenocarcinomas, dogs more often present with androgen-independent ductal carcinomas. A simple link between human diet and predisposition to prostate cancer (De Marzo et al, 1999) also does not satisfactorily explain the paradoxical (non)-diffusion of this tumor. The intriguing association between PCA3 and prostatic carcinoma in human males is at odds with the established concept that oncogenes are shared among different tumor types and/or animal species. How might this tissue- and species-specificity be linked to the currently unknown triggering event(s) in prostate cancer? A connection between oncoviruses, long noncoding RNAs, and cancer: coevolution to optimize fitness Tumor-related lncRNA transcripts are often encoded and/or regulated by viruses. Indeed, all known oncoviruses, including hepatitis B and C viruses (HBV and HCV, respectively), Epstein–Barr virus (EBV), human papillomavirus (HPV), and Kaposi's sarcoma-associated herpesvirus (KSHV), produce their own lncRNAs and/or induce the transcription of cellular lncRNAs, contributing to cancer predisposition (Li et al, 2016). This "virus-lncRNA-cancer" leitmotif has been validated in different malignant settings including HBV-Highly Upregulated in Liver Cancer (HULC) in hepatocellular carcinoma, EBV-Small Nucleolar RNA Host Gene 8 (SNHG8) in gastric cancer, and HPV-HOX transcript antisense intergenic RNA (HOTAIR) in cervical cancer. The connection is not limited to ongoing infections: Ancient viruses and their animal hosts have actively exchanged portions of genetic material throughout evolution (Krupovic & Koonin, 2017). This phenomenon is related to the need of viruses to optimize their replication by exploiting the eukaryotic cell machinery. In addition, random viral insertions can lead to the formation of virus-host chimeric functional units (e.g., lncRNAs) that are selected for their capacity to favor host functions in physiological and/or pathological conditions (e.g., cancer, inflammation, immunity). A consequence of this coevolution, the conservation between viral sequences and lncRNAs in at least mammals and birds, is beginning to be unraveled with regard to genomic structure and regulation. An interesting example in the poultry industry is the integration of several related avian leukosis viruses with miRNAs and lncRNAs to cause tumors, decreased fertility, and premature death (Lan et al, 2017). Is PCA3 an oncovirus-derived gene? Several attributes of PCA3 suggest that this lncRNA may be derived from and/or regulated by viruses. First, the PCA3 promoter and exon 1 are included in a partially conserved long interspersed nuclear element type 2 (LINE-2) repeat, which is an ancient virus-derived retrotransposon. This is similar to the HBV-regulated lncRNA HULC, whose promoter and first exon are embedded in a long-terminal repeat (LTR) retrotransposon-like sequence (Kapusta et al, 2013). Second, as would be expected if the PCA3 promoter were derived from a virus, it does not contain canonical transcription factor binding sites (e.g., TATA box) and shows no sequence conservation with any annotated human promoter. Third, PCA3 is located on the opposite DNA strand to intron 6 of the PRUNE2 gene. This configuration is reminiscent of the bidirectional transcription of the EBV latency origin of replication, with leftward transcripts being mainly noncoding and regulatory, and rightward transcripts containing open reading frames (Cao et al, 2015). Fourth, PRUNE2 downregulation by PCA3 occurs through adenosine deaminase acting on RNA (ADAR)-mediated editing, a post-transcriptional mechanism largely employed in the cellular response to viruses such as polyomavirus and EBV (Cao et al, 2015), and upregulated in EBV-infected lymphocytes (http://www.gtexportal.org/home/gene/ADAR). A tale of sex, viral transmission, and human prostate cancer Human prostate cancer has been associated with several viruses. Digital expression studies have shown that the human endogenous retrovirus K (HERV-H), a remnant of ancient infections fixed in the ancestral human genome 30–70 millions of years ago, is overexpressed in human stomach, colon and prostate cancers. The activation of an analogous retrovirus, HERV-K, induces the production of corresponding antigens and immune responses (Reis et al, 2013) that correlate with prostate cancer progression. A few additional indications of a direct viral etiology also exist. The BK polyomavirus (BKV) seems to be a cofactor in early stages of prostate cancer (Das et al, 2008), and its correlation with malignant progression has been proposed. Overall, a 19% prevalence of polyomaviruses such as BKV, JC virus (JCV), and SV40 has been reported in prostate cancer cases, suggesting that the subclinical persistent infections that are frequent in the human population might contribute to the onset and/or progression of this malignancy. Positive association with other oncoviruses such as HPV has also been established. In general, an increased relative risk estimate for prostate cancer has been associated with sexually transmitted diseases (e.g., gonorrhea and syphilis) (Dennis & Dawson, 2002), supporting the possibility of infectious components in tumor development. Despite their limitations, these data are encouraging: The challenge of finding a direct link between viral infection and cancer is common to a number of pathologies for which standard causation rules, for example, Koch's postulates and Hill's criteria of causality (reviewed in Moore & Chang, 2014), do not apply. Heterogeneous etiologies have been described for other virus-linked cancers, for example, Merkel cell carcinoma, where the presence of polyomavirus alone is not sufficient for tumor development as well as squamous cell carcinomas of the genital and head-and-neck regions, in which HPV infection appears to be a necessary yet insufficient cause (zur Hausen, 2002). Conclusion: How could this hypothesis be tested? To actually demonstrate the connection between viral infection, lncRNAs, and prostate cancer, the characterization of the variety of viruses present in tumor cells will be needed. Digital transcript subtraction has been successfully applied to uncover the association between polyomavirus and human Merkel cell carcinoma (Feng et al, 2008) and could also be employed to hunt for new oncoviruses in prostate cancer. To cover the full spectrum of virus-related mechanisms, a properly designed variant of this in silico strategy should be designed to include noncoding RNAs. Such next-generation approaches would rule out potential contaminations, as in the unfortunate precedent of xenotropic murine leukemia-related virus (XMRV), a putative retrovirus involved in prostate cancer later demonstrated to be a laboratory artifact (Paprotka et al, 2011). Also, a systematic analysis of virus-derived genomic sequences in a large cohort of prostate cancer patients would elucidate the structural connections between lncRNAs and ancient infections, as a preliminary step toward a comprehensive functional characterization of the corresponding mechanisms. Above all, this analysis should allow low stringency homology searches, to include poorly conserved sequences (such as the LINE-2 repeat in which PCA3 is embedded) derived from millions of years of evolutionary pressure, and thereby barely recognizable. In summary, we hypothesize that the prostate-specific lncRNA PCA3 has been introduced into the human genome by an ancient virus, and that it is regulated by virus-specific mechanisms (Fig 1). The identification of cellular and/or viral regulatory processes that are specifically engaged in prostate pathophysiology will be pivotal for understanding the contribution of PCA3 and other noncoding RNA transcripts in the onset and progression of prostate cancer, as well as the peculiar restriction of this tumor to humans. Figure 1. Schematic view of the proposed viral etiology of prostate cancerIn the normal prostate, basal expression of PRUNE2 correlates with low PCA3 levels. In prostate cancer, a putative oncovirus could activate PCA3 expression through a direct transactivation of a cryptic, ancient virus-derived promoter, resulting in downmodulation of PRUNE2, and leading to dysregulated cell proliferation and acquisition of malignant attributes. Download figure Download PowerPoint Acknowledgements We thank Dr. Helen Pickersgill (Life Science Editors) for editorial assistance. The authors apologize to the many colleagues for not citing important work due to space limitations. AAT was supported by a fellowship from São Paulo Research Foundations (FAPESP, grant #2016/06069-0). This work has been, in part, funded by a UNM Cancer Center Support Grant (P30 CA118100). Conflict of interest RP and WA have a patent 15/500,686 licensed to Mbrace Therapeutics on the subject of the present manuscript. All other authors declare that they have no conflict of interest. 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Urology 62: 34–43CrossrefPubMedWeb of Science®Google Scholar Previous ArticleNext Article Read MoreAbout the coverClose modalView large imageVolume 9,Issue 10,October 2017Cover: " mRNA mediates passive vaccination against infectious agents, toxins, and tumors" by Moritz Thran, Thomas Schlake and colleagues. As a transient carrier of information, exogenous mRNA is considered a possibly powerful tool to instruct a body to produce its own therapeutics. Antibody‐encoding, sequence‐optimized but otherwise unmodified mRNA in LNPs empowered mice to successfully fight various biological threats. (Artistic rendition by Uta Mackensen) Volume 9Issue 101 October 2017In this issue FiguresReferencesRelatedDetailsLoading ...
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