Expanding the tumor antigen landscape and maintaining APCs in a T cell-activating state to restore tumor immunity

扩大肿瘤抗原格局并维持 APC 处于 T 细胞激活状态以恢复肿瘤免疫

基本信息

  • 批准号:
    10604871
  • 负责人:
  • 金额:
    $ 44.72万
  • 依托单位:
  • 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:
    2023-05-03 至 2028-04-30
  • 项目状态:
    未结题

项目摘要

The goals of this study are to understand how inhibiting DNA-PK activity 1) induces and increases tumor antigen/neoantigen expression in weakly immunogenic tumors and 2) contributes to maintaining dendritic cells and myeloid cells in a T cell-activating state. These goals are motivated by exciting clinical results which demonstrate that T cell-based immunotherapies can mediate tumor regression but also because durable responses to current therapies are observed in only a subset of patients and against a limited number of cancers. Favorable responses to immunotherapies correlate with levels of neoantigens and changes in the tumor-reactive TCR repertory. Cancers can evade T cell detection by downregulating major histocompatibility complex (MHC I) and antigen expression. We screened ~2,500 compounds for the ability to selectively regulate the expression of various tumor-associated antigens (TAAs) and increase MHC I expression. Among the most effective drugs were DNA-PK inhibitors. Our preliminary studies indicate that DNA-PK inhibition increases and diversifies the expression of various TAAs and neoantigens in melanoma at the transcriptional level leading to increased protein expression. Further, reduced DNA-PK levels or DNA-PK mutations in patient samples are associated with increased tumor infiltrating lymphocytes (TIL) and tumor mutation burden. The overarching hypothesis is that DNA-PK plays a novel role as a transcriptional regulator that modifies the expression of melanoma tumor antigens, including neoantigens, and thereby increases the diversity, frequency, and activity of tumor-reactive T cells. We further postulate that inhibiting DNA-PK activity in DCs and myeloid cells reduces their propensity to enter a T cell-suppressive state. These hypotheses will be addressed through the following aims. In Aim 1, we will determine the molecular mechanisms by which DNA- PKcs regulates tumor antigen expression by determining the role of kinase activity, identifying the DNA-PK substrate(s) that contribute to its repressive function, and to define the roles that the individual DNA-PK subunits play in transcriptional regulation. Aim 2 will ascertain the in vivo impact that DNA-PK inhibition has on increasing and diversifying the tumor-reactive T cell repertoire. We seek to demonstrate that DNA-PK inhibition treatment increases the number and activity of neoantigen-reactive T cells. Aim 3 will determine the impact that inhibiting DNA-PK has on inducing and sustaining stimulatory signals on tumor derived dendritic and myeloid cells. We will determine how DNA-PK inhibition prevents DCs and myeloid cells from a entering a T cell-suppressive state. The proposed studies are significant as they will offer molecular and cellular insights as to how DNA-PK activity contributes to tumor immunogenicity and exploit these insights to develop more reliable biomarkers and effective therapies against weakly immunogenic tumors.
这项研究的目标是了解如何抑制DNA-PK活性1)诱导和增加肿瘤 弱免疫原性肿瘤中的抗原/新抗原表达和2)有助于维持树突状细胞 和T细胞激活状态下的髓样细胞。这些目标是由令人兴奋的临床结果激励的 证明基于T细胞的免疫疗法可以介导肿瘤回归,也可以耐用 仅在一部分患者中观察到对当前疗法的反应,并且对数量有限 癌症。对免疫疗法的有利反应与新抗原的水平相关,并且变化 肿瘤反应性TCR曲目。癌症可以通过下调主要的组织兼容性来逃避T细胞检测 复合物(MHC I)和抗原表达。我们筛选了约2,500种化合物,以选择性地 调节各种肿瘤相关抗原(TAA)的表达并增加MHC I表达。之中 最有效的药物是DNA-PK抑制剂。我们的初步研究表明DNA-PK抑制作用 增加和多样化在转录中黑色素瘤中各种TAA和新抗原的表达 水平导致蛋白质表达增加。此外,患者的DNA-PK水平或DNA-PK突变降低 样品与肿瘤浸润增加的淋巴细胞(TIL)和肿瘤突变负担有关。这 总体假设是DNA-PK作为转录调节剂起着新颖的作用,可修饰 包括新抗原在内的黑色素瘤肿瘤抗原的表达,从而增加多样性, 肿瘤反应性T细胞的频率和活性。我们进一步假设抑制DCS中的DNA-PK活性 髓样细胞减少了进入T细胞抑制状态的倾向。这些假设将是 通过以下目标解决。在AIM 1中,我们将确定DNA-的分子机制 PKC通过确定激酶活性的作用来调节肿瘤抗原表达,鉴定DNA-PK 有助于其抑制功能并定义单个DNA-PK的作用的底物 亚基在转录调节中发挥作用。 AIM 2将确定DNA-PK抑制对的体内影响 增加和多样化肿瘤反应性T细胞库。我们试图证明DNA-PK抑制 治疗增加了新抗原反应性T细胞的数量和活性。 AIM 3将决定影响 抑制DNA-PK具有诱导和维持刺激信号的肿瘤衍生的树突状和 髓样细胞。我们将确定DNA-PK抑制如何阻止DC和髓样细胞进入T 细胞抑制状态。提出的研究很重要,因为它们将提供分子和细胞见解 DNA-PK活性如何有助于肿瘤免疫原性并利用这些见解以发展更多 可靠的生物标志物和针对弱免疫原性肿瘤的有效疗法。

项目成果

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Eduardo V Davila其他文献

Eduardo V Davila的其他文献

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{{ truncateString('Eduardo V Davila', 18)}}的其他基金

Colorado Preparation in Interdisciplinary Knowledge to Excel PREP
科罗拉多州跨学科知识准备至 Excel PREP
  • 批准号:
    10344884
  • 财政年份:
    2022
  • 资助金额:
    $ 44.72万
  • 项目类别:
Colorado Preparation in Interdisciplinary Knowledge to Excel PREP
科罗拉多州跨学科知识准备至 Excel PREP
  • 批准号:
    10559519
  • 财政年份:
    2022
  • 资助金额:
    $ 44.72万
  • 项目类别:
Restoring the Regulation of a Central Signaling Pathway to Prevent Metastases and Reinstate Tumor Immunity
恢复中央信号通路的调节以预防转移并恢复肿瘤免疫
  • 批准号:
    10454780
  • 财政年份:
    2020
  • 资助金额:
    $ 44.72万
  • 项目类别:
Restoring the Regulation of a Central Signaling Pathway to Prevent Metastases and Reinstate Tumor Immunity
恢复中央信号通路的调节以预防转移并恢复肿瘤免疫
  • 批准号:
    10618915
  • 财政年份:
    2020
  • 资助金额:
    $ 44.72万
  • 项目类别:
Restoring the Regulation of a Central Signaling Pathway to Prevent Metastases and Reinstate Tumor Immunity
恢复中央信号通路的调节以预防转移并恢复肿瘤免疫
  • 批准号:
    9891885
  • 财政年份:
    2020
  • 资助金额:
    $ 44.72万
  • 项目类别:
Cancer Immunotherapy and Experimental Therapeutics - T32
癌症免疫疗法和实验疗法 - T32
  • 批准号:
    10208822
  • 财政年份:
    2019
  • 资助金额:
    $ 44.72万
  • 项目类别:
Cancer Immunotherapy and Experimental Therapeutics - T32
癌症免疫疗法和实验疗法 - T32
  • 批准号:
    9974498
  • 财政年份:
    2019
  • 资助金额:
    $ 44.72万
  • 项目类别:
Cancer Immunotherapy and Experimental Therapeutics - T32
癌症免疫疗法和实验疗法 - T32
  • 批准号:
    10434021
  • 财政年份:
    2019
  • 资助金额:
    $ 44.72万
  • 项目类别:
Cancer Immunotherapy and Experimental Therapeutics - T32
癌症免疫疗法和实验疗法 - T32
  • 批准号:
    10646231
  • 财政年份:
    2019
  • 资助金额:
    $ 44.72万
  • 项目类别:
Augmenting T cell activity to weak tumor antigens and reversing myeloid cell-mediated T cell inhibition
增强 T 细胞对弱肿瘤抗原的活性并逆转骨髓细胞介导的 T 细胞抑制
  • 批准号:
    9669010
  • 财政年份:
    2018
  • 资助金额:
    $ 44.72万
  • 项目类别:

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改造 T 细胞以克服抑制性受体信号,这些信号限制了过继性细胞疗法对卵巢癌的疗效
  • 批准号:
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  • 财政年份:
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针对突变 KRAS 实体瘤的下一代 T 细胞疗法
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  • 财政年份:
    2023
  • 资助金额:
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Mechanisms of Durable Antitumor Immunity Mediated by PI3K-targeted T cells
PI3K 靶向 T 细胞介导的持久抗肿瘤免疫机制
  • 批准号:
    10682190
  • 财政年份:
    2023
  • 资助金额:
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HORMAD-specific TGF-beta resistant memory T cells for treatment of patients with Gastro-esophageal Cancer
HORMAD 特异性 TGF-β 耐药性记忆 T 细胞用于治疗胃食管癌患者
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