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RNA-seq analysis of CNE1 cells based on LMP1 expression

ABSTRACT: Epstein-Barr virus (EBV) and human papillomavirus (HPV) infection are the risk factors for nasopharyngeal carcinoma and cervical carcinoma, respectively. However, clinical analyses demonstrate that EBV or HPV is associated with improved response of patients, although underlying mechanism remains unclear. Here, we found DNA tumor viruses, such as EBV and HPV, inhibited antioxidant activity and increased oxidative stress of tumor through analyzing RNA-seq data of clinical samples. Further, we found the oncoproteins of DNA tumor viruses, such as LMP1 of EBV and E7 of HPV, interacted with PERK through a conserved motif, which inhibited PERK-Nrf2 signaling and increased the level of reactive oxygen species (ROS). This inhibition of PERK-Nrf2 signaling in LMP1- or E7- positive cancer cells exhibited an increased sensitivity to chemotherapy in vivo. Meanwhile, LMP1- or E7-induced ROS promoted tumor growth. Consistently, disruption of viral oncoprotein-PERK interactions attenuated tumor growth and efficacy of chemotherapy in tumor-bearing mouse models. Our findings uncovered a paradoxical effect of DNA tumor virus oncoproteins on tumors and highlighted that targeting PERK-Nrf2 signaling might be an attractive strategy for the treatment of NPC and cervical carcinoma.

ORGANISM(S): Homo sapiens

PROVIDER: GSE171664 | GEO | 2021/04/08

REPOSITORIES: GEO

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Glycogene expression profiles based on microarray data of cervical carcinoma HeLa cells partially silenced in E6 and E7 HPV oncogenes

Project description:Aberrant glycosylation is a characteristic of tumor cells. The expression of certain glycan structures has been associated with poor prognosis. In cervical carcinoma has been reported changes in the gene expression level of some glycogenes that has been associated with lymph invasion. Human papilloma virus (HPV) infection is one of the most important factors to develop cervical cancer. HPV oncoproteins E6 and E7 have been implicated in cervical carcinogenesis. The role of these oncoproteins in glycosylation changes has not been reported. To know the effect of these oncoproteins on glycogene expression we realized a partial silencing of oncogenes E6 and E7 in HeLa cells, we made a microarray expression assay and we identified glycogenes that modified its expression. The analysis showed alteration in some glycosylation pathways, like glycosphingolipid, O-glycan mucin-type, and O-glycan non mucin-type glycosylation. Our results suggest that E6 and E7 oncoproteins could modified glycosylation of structures implicated in proliferation, adhesion, and apoptosis.

2016-12-07 | GSE90930 | GEO

Effects of hypoxia on antigen presentation and T cell-based immune recognition of HPV16-transformed cells

Project description:Attempts to develop a therapeutic vaccine against human papillomavirus (HPV)-induced malignancies have not been clinically successful to date. One reason may be the hypoxic microenvironment present in most tumors, including cervical cancer. Hypoxia dysregulates the levels of human leukocyte antigen (HLA) class I molecules in different tumor entities, impacts function of cytotoxic T cells, and leads to decreased protein levels of the oncoproteins E6 and E7 in HPV-transformed cells. Therefore, we investigated the effect of hypoxia on the presentation of HPV16 E6- and E7-derived epitopes in cervical cancer cells and its effect on epitope-specific T cell cytotoxicity. Hypoxia induced downregulation of E7 protein levels in all analyzed cell lines, as assessed by Western blotting. However, contrary to previous reports, no perturbation of antigen presentation machinery (APM) components and HLA-A2 surface expression upon hypoxia treatment was detected by mass spectrometry and flow cytometry, respectively. Cytotoxicity assays performed in hypoxic conditions showed differential effects on the specific killing of HPV16-positive cervical cancer cells by epitope-specific CD8+ T cell lines in a donor- and peptide-specific manner. Effects of hypoxia on the expression of PD-L1 were ruled out by flow cytometry analysis. Altogether, our results suggest an intact APM, and cytotoxicity despite the decreased expression of E6 and E7, suggesting that successful immunotherapies can be developed for HPV-induced cervical cancer, especially if combined with hypoxia-alleviating measures.

2022-11-16 | PXD032217 | Pride

Transgenic SCLC induced by E6/E7 oncoproteins vs normal controls

Project description:The human papillomavirus virus (HPV) is a proven cause of most human cervical cancers, and might have a role in other malignancies including vulva, skin, oesophagus, head and neck cancer. HPV has also been speculated to have a role in the pathogenesis of lung cancer. To validate the hypothesis of HPV involvement in small cell lung cancer pathogenesis we performed gene expression profile of transgenic mouse model of SCLC induced by HPV-16 E6/E7 oncoproteins. Gene expression profile of SCLC has been performed using Agilent whole mouse genome (4x44k) representing ~ 41000 genes and mouse transcripts. Samples were obtained from two HPV16-E6/E7 transgenic mouse model and from littermateM-bM-^@M-^Ys normal lung.

2014-05-27 | E-GEOD-23962 | biostudies-arrayexpress

Transgenic SCLC induced by E6/E7 oncoproteins vs normal controls

2014-05-27 | GSE23962 | GEO

Human Papillomavirus (HPV) genomic integration, expression and E6/E7 splicing patterns in cervical cancer associated with HPV16 or HPV18 infection

Project description:Human papillomavirus (HPV) genome integration into the host genome, blocking E2 expression and leading to overexpression of E6 and E7 viral oncogenes, is considered a major step in cervical cancer development. In high-risk HPVs, E6 and E7 oncogenes are expressed as a bicistronic pre-mRNA, with alternative splicing producing the ultimate mRNAs required for E6 and E7 translation. Given the number of alternative donor and acceptor splicing sites, ten E6/E7 different alternative transcripts might be formed for HPV16 and three for HPV18, although only six isoforms have been previously reported for HPV16. In the present work, we employ high-throughput sequencing of invasive cervical cancer transcriptome (RNA-Seq) to characterize the expression of the HPV genome in 24 invasive cervical cancers associated with HPV16 and HPV18 single infections. Based on high-resolution transcriptional maps, we herein report three viral gene expression patterns which might be associated with the presence of the viral genome in episomal and/or integrated stages. Alternative mRNAs splicing isoforms coding for E6 and E7 oncoproteins were characterized and quantified, and two novel isoforms were identified. Three major isoforms (E6*I, E6*II, and E6+E7) were detected for HPV16 and two for HPV18 (E6*I and E6+E7). Minor transcript isoforms, including the novel ones, were very rare in some tumor samples or were not detected. Our data suggested that minor transcript isoforms of E6/E7 do not play a relevant role in cervical cancer.

2019-08-06 | GSE91065 | GEO

Identification of downstream targets of the human papillomavirus E6 and E7 oncoproteins by RNA interference

Project description:Specific types of human papillomaviruses (HPVs) cause cervical cancer, the second most common tumor in females worldwide. Both cellular transformation and the maintenance of the oncogenic phenotype of HPV-positive tumor cells are linked to the expression of the viral E6 and E7 oncogenes. In order to identify downstream cellular target genes for the viral oncoproteins, we silenced endogenous E6 and E7 expression in HPV-positive HeLa cells by RNA interference (RNAi). Subsequently, we assessed changes of the cellular transcriptome by genome-wide microarray analysis. We identified, 648 genes wich were either downregulated (360 genes) or upregulated (288 genes) upon inhibition of E6/E7 expression. A large fraction of these genes is involved in tumour-relevant processes, such as apoptosis control, cell cycle regulation, or spindle formation. Others may represent novel cellular targets for the HPV oncogenes, such as a large group of C-MYC-associated genes involved in RNA splicing. Keywords: siRNA mediated knockdown

2007-07-01 | GSE6926 | GEO

Effect of HPV 16 E6, E7 oncoproteins on the expression level of cellular genes

Project description:The life cycle of human papillomaviruses (HPV) is strictly linked to the differentiation of their natural host cells. The HPV E6 and E7 oncoproteins can delay the normal differentiation program of keratinocytes, however, the exact mechanisms responsible for this have not yet been identified. The goal of this study was to investigate the effects of HPV16 oncoproteins on the expression of genes involved in keratinocyte differentiation. Primary human keratinocytes transduced by LXSN (control) retroviruses or virus vectors expressing HPV16 E6, E7 or E6/E7 genes were subjected to gene expression profiling. The results of microarray analysis showed that HPV 16 E6 and E7 have the capacity to down-regulate the expression of several genes involved in keratinocyte differentiation. Quantitative real-time polymerase chain reaction (qRT-PCR) assays were performed to confirm microarray data. To investigate the effects of the HPV oncoproteins on the promoters of selected keratinocyte differentiation genes, luciferase reporter assays were performed. Our results suggest that the HPV 16 E6 and/or E7 oncogenes are able to down-regulate the expression of several genes involved in keratinocyte differentiation, at least partially by down-regulating their promoter activity. This activity of the HPV oncoproteins may have a role in the productive virus life cycle, and also in virus induced carcinogenesis. Primary human foreskin keratinocytes were transduced by retrovirus vectors containing HPV 16 E6, E7, E6/E7 or the control vector LXSN. The global gene expression patterns of transduced keratinocytes were analyzed on Affymetrix microarrays

2014-06-26 | E-GEOD-58841 | biostudies-arrayexpress

Effect of HPV 16 E6, E7 oncoproteins on the expression level of cellular genes

2014-06-26 | GSE58841 | GEO

Nuclear Lactate Dehydrogenase A Senses ROS to Produce α-Hydroxybutyrate for HPV-Induced Cervical Tumor Growth

Project description:It is well known that high-risk human papilloma virus (HR-HPV) infection is strongly associated with cervical cancer and E7 was identified as one of the key initiators in HPV-mediated carcinogenesis. Here we show that lactate dehydrogenase A (LDHA) preferably locates in the nucleus in HPV16-positive cervical tumors due to E7-induced intracellular reactive oxygen species (ROS) accumulation. Surprisingly, nuclear LDHA gains a non-canonical enzyme activity to produce α-hydroxybutyrate and triggers DOT1L (disruptor of telomeric silencing 1-like)-mediated histone H3K79 hypermethylation, resulting in the activation of antioxidant responses and Wnt signaling pathway. Furthermore, HPV16 E7 knocking-out reduces LDHA nuclear translocation and H3K79 tri-methylation in K14-HPV16 transgenic mouse model. HPV16 E7 level is significantly positively correlated with nuclear LDHA and H3K79 tri-methylation in cervical cancer. Collectively, our findings uncover a non-canonical enzyme activity of nuclear LDHA to epigenetically control cellular redox balance and cell proliferation facilitating HPV-induced cervical cancer development.

2018-09-24 | PXD011058 | Pride

Systematic analysis of IL-1 cytokine signaling by high-risk HPV oncoproteins

Project description:Human papillomavirus (HPV) E6 and E7 oncoproteins are expressed at all stages of HPV-mediated carcinogenesis and are essential drivers of cancers caused by high-risk HPV. Some of the activities of HPV E6 and E7, such as their interactions with host cellular tumor suppressors, have been characterized extensively. There is less information about how high-risk HPV E6 and E7 alter cellular responses to cytokines that are present in HPV-infected tissues and are an important component of the tumor microenvironment. We used several models of HPV oncoprotein activity to assess how E6 and E7 alter the cellular response to the pro-inflammatory cytokine IL-1beta. Models of early-stage HPV infection (human keratinocytes expressing HPV16 E6 and E7) and models of established HPV-positive head and neck cancers (patient-derived xenografts, head and neck cancer cell lines) exhibited similar dysregulation of IL-1 pathway genes and suppressed responses to IL-1beta treatment. Such overlap in cell responses supports that changes induced by HPV E6 and E7 early in infection could persist and contribute to a dysregulated immune environment throughout carcinogenesis. HPV E6 and E7 also drove the upregulation of several suppressors of IL-1 cytokine signaling, including SIGIRR, both in primary keratinocytes and in cancer cells. SIGIRR knockout was insufficient to increase IL-1beta-dependent gene expression in the presence of HPV16 E6 and E7, suggesting that multiple suppressors of IL-1 signaling contribute to dampened IL-1 responses in HPV16-positive cells.

2022-10-31 | GSE211730 | GEO

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