Methionine and PI3K Metabolism Drive CIMP in EBV Epithelial Cancers

蛋氨酸和 PI3K 代谢驱动 EBV 上皮癌中的 CIMP

基本信息

批准号：
10627692
负责人：
Benjamin Elison Gewurz
金额：
$ 47.11万
依托单位：
WISTAR INSTITUTE
依托单位国家：
美国
项目类别：
财政年份：
2023
资助国家：
美国
起止时间：
2023-05-11 至 2028-04-30
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10627692
关键词：
Automobile Driving B-Lymphocytes BRCA1 gene Bacterial Artificial Chromosomes Bioinformatics Biological Assay Burkitt Lymphoma CRISPR screen Carbon Carcinoma Cell Death Cells Characteristics Chemicals Clustered Regularly Interspaced Short Palindromic Repeats Collaborations Communication CpG Island Methylator Phenotype DNA DNA Damage DNA Methylation DNA Repair Data Decitabine Disease Dose Enzymes Epigenetic Process Epithelial Cells Epithelium Epstein-Barr Virus Infections Epstein-Barr Virus latency Epstein-Barr Virus-Related Malignant Neoplasm Foundations G9a histone methyltransferase Genetic Genomics Glutathione Metabolism Pathway Growth Human Human Genome Human Herpesvirus 4 Hyperactivity Hypermethylation Integration Host Factors Isotopes Knock-out Knowledge Latent virus infection phase Learning Malignant Epithelial Cell Malignant Neoplasms Membrane Proteins Metabolic Metabolic Control Metabolic Pathway Metabolism Methionine Methionine Metabolism Pathway Methylation Modeling Mutagenesis Mutation Nasopharynx Carcinoma Oncogenic Organoids Oxidation-Reduction Oxidative Stress Pathway interactions Phosphatidylinositols Phosphotransferases Play Property Proteins Proto-Oncogene Proteins c-akt Reaction Recombinants Regulation Role S-Adenosylhomocysteine S-Adenosylmethionine Signal Transduction Somatic Mutation Stomach Carcinoma Testing The Cancer Genome Atlas Therapeutic Tropism Tumor Suppressor Proteins Viral Viral Genome Virus Latency Xenograft Model Xenograft procedure alpelisib antagonist cancer cell cancer genome dietary driver mutation epigenome gain of function gastric organoids genome-wide glutathione peroxidase histone methylation homologous recombination insight malignant stomach neoplasm metabolomics mouse model neoplastic cell novel novel therapeutic intervention personalized approach programs recombinational repair response transcription factor transcriptome sequencing tumor tumor metabolism ubiquitin-protein ligase

项目摘要

PROJECT 3 – PROJECT SUMMARY Epstein-Barr virus (EBV) is associated with multiple epithelial cell diseases, including gastric cancer and nasopharyngeal carcinoma. Despite its B-cell tropism, more than half of the 200,000 EBV-associated cancers that occur annually are gastric and nasopharyngeal carcinomas. The Cancer Genome Atlas project identified EBV-infected gastric cancer as one of the four biologically distinct subtypes. Extreme tumor genome CpG island methylator phenotype (CIMP) and gain-of-function PI3K mutations are salient features, suggesting interconnected driver roles in EBV+ GC. In fact, EBV+ gastric cancer has the highest level of DNA methylation of any human cancer. Hypermethylation and elevated PI3K activity are also characteristic of EBV+ NPC and Burkitt lymphoma, further suggesting a close pathogenetic relationship of these oncogenic properties with highly restricted forms of EBV latency. Yet, much remains to be learned about how latent EBV mutation together with tumor driver mutations result in epithelial cancers, and how these can be targeted by precision approaches. We therefore used EBV+ epithelial tumor cell RNAseq and CRISPR/Cas9 screens to identify host factors whose knockout is synthetic lethal with reversal of CIMP by the hypomethylating agent decitabine or upon blockade of PI3K hyperactivity by the highly selective antagonist alpelisib. Our central hypothesis is that EBV+ epithelial cancers rely on cross-talk between latent viral genomes, and hyperactive PI3K and CIMP, disruption of which can be targeted in synthetic lethal approaches. Our Aims are to (1) Define the role of latent EBV in driving CIMP; (2) Define the role of hyperactive PI3K signaling in EBV+ epithelial cancers in support of CIMP; (3) Define key synthetic lethal vulnerabilities upon EBV+ epithelial cancer CIMP reversal. Collectively, these studies are expected to identify how EBV-infected epithelial cancers subvert host methionine and PI3K metabolism pathways to support CIMP, and how in turn CIMP not only silences tumor suppressors, but also plays key roles in guarding against DNA damage. Our studies may therefore support strategies to develop rational therapeutic approaches for EBV-associated epithelial cancers.

项目 3 – 项目摘要 EB 病毒 (EBV) 与多种上皮细胞疾病相关，包括胃癌和尽管鼻咽癌具有 B 细胞趋向性，但 200,000 例 EBV 相关癌症中有一半以上癌症基因组图谱项目确定了每年发生的胃癌和鼻咽癌。 EBV 感染的胃癌是四种生物学上不同的亚型之一：极端肿瘤基因组 CpG 岛。甲基化表型 (CIMP) 和功能获得性 PI3K 突变是显着特征，表明 EBV+ GC 中相互关联的驱动作用事实上，EBV+ 胃癌具有最高水平的 DNA 甲基化。任何人类癌症的高甲基化和 PI3K 活性升高也是 EBV+ NPC 的特征。伯基特淋巴瘤进一步表明这些致癌特性与高度然而，关于潜在的 EBV 突变如何与 EBV 潜伏期结合，还有很多东西需要了解。驱动肿瘤突变导致上皮癌，以及如何通过精准方法靶向这些突变。因此，使用 EBV+ 上皮肿瘤细胞 RNAseq 和 CRISPR/Cas9 筛选来鉴定其宿主因子敲除是合成致死性的，通过低甲基化剂地西他滨逆转 CIMP 或阻断高度选择性拮抗剂 alpelisib 导致 PI3K 过度活跃我们的中心假设是 EBV+ 上皮细胞。癌症依赖于潜伏病毒基因组之间的串扰以及过度活跃的 PI3K 和 CIMP，我们的目标是 (1) 定义潜在 EBV 在合成致死方法中的作用。驱动 CIMP；(2) 定义高度活跃的 PI3K 信号在 EBV+ 上皮癌中支持 CIMP 的作用； (3) 定义 EBV+ 上皮癌 CIMP 逆转的关键合成致命弱点。预计研究将确定 EBV 感染的上皮癌如何破坏宿主蛋氨酸和 PI3K 支持 CIMP 的代谢途径，以及 CIMP 如何不仅沉默肿瘤抑制因子，而且因此，我们的研究可能支持制定策略以防止 DNA 损伤。 EB 病毒相关上皮癌的合理治疗方法。