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Targeting oncogenic Myb fusions in salivary gland cancer with the elongation inhibitor SVC112

使用延伸抑制剂 SVC112 靶向唾液腺癌中的致癌 Myb 融合

基本信息

批准号：
10368161
负责人：
Antonio Jimeno
金额：
$ 49.29万
依托单位：
UNIVERSITY OF COLORADO DENVER
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-04-01 至 2026-03-31
项目状态：
未结题

来源：
https://reporter.nih.gov/project-details/10368161
关键词：
ATP Hydrolysis Adenoid Cystic Carcinoma Affect Biochemical Biology CRISPR/Cas technology Cancer Cluster Cancer Model Cancer Patient Cancer cell line Catalogs Cell Line Cells Chimeric Proteins Clinical Clustered Regularly Interspaced Short Palindromic Repeats Colorado Complex Cyclin D1 Databases Dependence Disease Disease model Distant Metastasis Dose Drug Kinetics Event FDA approved FRAP1 gene Frequencies Gene Fusion Genes Genetic Genetic Markers Goals Growth Hour Human Hypoxia Image Implant Internal Ribosome Entry Site Lead Lentivirus Vector Malignant Neoplasms Malignant neoplasm of salivary gland Measures Mediating Messenger RNA Modeling Molecular Molecular Target Mucoepidermoid Carcinoma Mus Mutate Mutation NFIB gene Oncogenic Orphan Other Genetics Pathway interactions Patients Pharmaceutical Preparations Pharmacology Phosphorylation Physiological Population Predisposition Production Property Protein Biosynthesis Protein Inhibition Protein Overexpression Proteins Proteome Proteomics Radiation Rare Diseases Recurrence Relapse Reporting Ribosomes Role Seminal Signal Transduction Solid Neoplasm Stress Testing Therapeutic Therapeutic Index Toxic effect Transcript Translating Translations Tumorigenicity Unresectable Up-Regulation antitumor effect cancer cell clinically significant cohort exome sequencing gene product human model in vitro Assay in vitro Model in vivo in vivo Model in vivo evaluation inhibitor neoplastic cell novel novel therapeutics overexpression patient derived xenograft model predictive marker protein biomarkers ribosome profiling small molecule targeted treatment transcription factor transcriptome sequencing tumor tumor behavior tumor growth tumor initiation tumorigenic

项目摘要

SUMMARY. Salivary gland cancer (SGC) is an orphan disease for which no targeted therapies are approved. SGCs are divided into histotypes, the most common being adenoid cystic carcinoma (ACC) and mucoepidermoid carcinoma (MEC). We have generated one of the largest reported SGC PDX banks including major histotypes like ACC and the first reported PDX models of MEC. Our SGC PDX bank includes several cases from the same patient, collected after subsequent relapses, which has allowed an exploration of the acquisition of oncogenic gene events. Similar to other reports, our SGC models had low mutation burden by whole exome sequencing, and RNA-seq analysis identified known (MYB-NFIB), novel (NFIB-MTFR2), and even dual gene fusions in ACC cases that gave rise to oncogenic fusion protein products. Other genetic events in SGC clustered in the PI3K and mTOR pathways, which impinge upon protein synthesis. Both MEC and ACC overexpress key transcription factors such as Myc or SOX2 that dictated tumorigenicity and growth in SGC. Overall, we propose that protein synthesis is an unexplored target in SGC. SVC112 is a small molecule that inhibits protein synthesis at the elongation step by inhibiting eEF2. In our seminal studies where SVC112 was first reported, protein synthesis and growth inhibition were associated; SVC112 had greater effect on cancer over non-cancer cells; SVC112 depleted SOX2, Myc, and Cyclin D1, and arrested growth in vivo. In both ACC and MEC cell lines we found that SVC112 inhibits both native Myb and the protein products of MYB fusions and key proteins like Myc. SVC112 inhibited proliferation and sphere formation in both ACC and MEC in vitro assays, and had notable single agent activity (including actual tumor shrinkage) in 2 ACC PDX, one with a MYB fusion and another one showing non- fusion mediated Myb upregulation. We propose to study the role of oncogenic fusions in SGC, the mechanism of action of SVC112 in SGC, and the efficacy of SVC112 in complex SGC models. First, we will catalogue and prioritize MYB fusions from large patient and PDX cohorts. Then, to understand key genetic events we will insert fusions in non-cancer cell lines, and deploy CRISPR and lentiviral vectors in fusion-and non-fusion-bearing SGC cell lines, respectively; we will also test SVC112 inhibition to add an additional layer of testing of the impact of protein modulation. The hypothesis that SVC112’s selective effect is due to selective depletion of key proteins will be tested by ribosome profiling (to identify mRNA targets) and proteomics analysis (to identify proteins targets). Lastly, we will test the in vivo efficacy of SVC112 using both native SGC PDX models bearing MYB and other fusions and wild-tpy, as well as in vivo models with the CRISPR-depleted MYB fusions strains. Overall our goal is to examine dependence on fusion events vs protein overexpression by other molecular mechanisms for SVC112 susceptibility. This project will propel the translation of SVC112, a new drug for SGC discovered in Colorado, by dissecting the basis for its effect and therapeutic window, and identifying its efficacy in advanced SGC models with a plan that enables identification of which subset of SGC patients may derive more benefit.

总结。唾液腺癌（SGC）是一种孤儿病，目前尚无靶向治疗获批。