Examine the function of APOBEC3B in epithelial ovarian cancer stem cells

检查 APOBEC3B 在上皮性卵巢癌干细胞中的功能

基本信息

  • 批准号:
    10438420
  • 负责人:
  • 金额:
    $ 7.9万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
  • 财政年份:
    2022
  • 资助国家:
    美国
  • 起止时间:
    2022-03-01 至 2024-02-29
  • 项目状态:
    已结题

项目摘要

SUMMARY/ABSTRACT Ovarian cancer is the most lethal gynecologic malignancy and is frequently diagnosed at an advanced-stage. One of the most aggressive types of ovarian cancer is epithelial ovarian cancer (EOC) and 5-year survival is less than 20%. In recent years, PARP inhibitors (PARPi) has shown impressive therapeutic efficacy as both maintenance therapy and in recurrent setting. However, since the wide application of PARPi, patients ultimately develop drug resistance to PARPi which leaves them with few treatment options. Thus, the development of novel therapies to overcome PAPRi resistance represents an urgent unmet medical need. The PARPi-resistant patients often have enriched cancer stem cells (CSCs) with enhanced pro-survival and self-renewal capacity. Evidence demonstrations that EOC CSCs are responsible for primary tumor growth, metastasis, disease relapse and resistance to chemotherapy, suggesting CSC is an attractive target for eradicating EOC. Our long-term goal is to identify new targets for development of less toxic and more effective therapies by eliminating this cell population. Apolipoprotein B mRNA editing enzyme catalytic polypeptide-like 3 (APOBEC3) proteins are a family of DNA deaminase that catalyze cytidine to uridine (C-to-U) on single-strand DNA. This important DNA modification is abundant in a wide array of cancer types and represent the only enzymatic source of mutations. We discovered that APOBEC3B (A3B) is the main DNA mutators in EOC CSC. The C-to-U DNA mutation activity and A3B expression is reduced in EOC CSCs compared to non-CSCs. Importantly, inhibition of A3B leads to PARPi resistance, elevated frequency of CSCs, and enhanced expression of stemness factor SOX2. These novel insights raise the possibility that A3B activation may sensitize EOC CSCs to PARPi. Our central hypothesis is that EOC CSCs maintain low level of A3B in order to avoid excess DNA damage thereby counters the effect of PARPi. The overall goal of this study is to dissect the mechanism through which A3B and DNA deamination regulates CSC maintenance and promote response to PARPi in EOC CSC. We will address our hypothesis in two specific aims: 1) Determine if modified A3B activity will sensitize CSCs to combination therapy with PARPi, 2) Identify the novel mechanisms by which A3B regulates response to PARP inhibitor in EOC CSCs. We will perform A3B overexpression studies in patient-derived organoid models and comprehensively evaluate changes in EOC CSC functions and the response to PARPi. Mechanistically, we will assess DNA damage pathways, chromosomal abnormalities, and ssDNA break levels in CSCs that overexpress A3B alone and in combination treatment with PARPi. In addition, the molecular mechanism of how A3B regulates CSC’s response to PARPi will also be examined. This innovative study will improve our understanding of how A3B sensitize EOC CSCs to PARPi by promoting DNA damage and uncover valuable novel therapeutic targets to preventing ovarian cancer relapse. These mechanisms may be broadly applicable to other CSC-driven malignancies.
摘要/文摘

项目成果

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Qingfei Jiang其他文献

Qingfei Jiang的其他文献

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{{ truncateString('Qingfei Jiang', 18)}}的其他基金

Examine the function of APOBEC3B in epithelial ovarian cancer stem cells
检查 APOBEC3B 在上皮性卵巢癌干细胞中的功能
  • 批准号:
    10580076
  • 财政年份:
    2022
  • 资助金额:
    $ 7.9万
  • 项目类别:
Investigating the role of epitranscriptomic A-to-I RNA editing in T-cell acute lymphoblastic leukemia
研究表观转录组 A-to-I RNA 编辑在 T 细胞急性淋巴细胞白血病中的作用
  • 批准号:
    10220900
  • 财政年份:
    2019
  • 资助金额:
    $ 7.9万
  • 项目类别:

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