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
- 来源:
- 关键词:AddressAdoptive Cell TransfersAntigensBindingBiological MarkersCancer PatientCell LineageCellsCellular immunotherapyClinicalDNADNA-PKcsDNA-dependent protein kinaseDataDendritic CellsDetectionEngineeringFrequenciesG22P1 geneGenetic TranscriptionGoalsHeadHistocompatibility AntigensHumanImmuneImmune systemImmunotherapyIn VitroIndividualKnock-outLigandsMajor Histocompatibility ComplexMalignant NeoplasmsMediatingMicrosatellite InstabilityMolecularMusMutationMyelogenousMyeloid CellsPD-1/PD-L1PatientsPharmaceutical PreparationsPhasePhosphotransferasesPlayPromoter RegionsProteinsRoleSamplingSignal TransductionSurfaceT cell responseT-Cell ActivationT-Cell ReceptorT-LymphocyteT-cell receptor repertoireTranscriptTranscription RepressorTranscriptional RegulationTumor AntigensTumor ExpansionTumor ImmunityTumor-DerivedTumor-Infiltrating LymphocytesVaccinesanti-CTLA4anti-PD-L1 antibodiesanti-cancercancer cellcancer immunotherapycancer survivalclinically significanteffective therapyengineered T cellsimmune checkpoint blockadeimmunogenicimmunogenicityin vivoinhibitorinsightmelanomamembermouse modelneoantigensnoveloncology trialpatient subsetspreventprotein expressionresearch clinical testingresponsetherapy designtumor
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
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
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Eduardo V Davila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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