Targeting the ER Stress Response in ARID1A-mutant Ovarian Clear Cell Carcinoma
靶向 ARID1A 突变型卵巢透明细胞癌的 ER 应激反应
基本信息
- 批准号:9911197
- 负责人:
- 金额:$ 4.55万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2019
- 资助国家:美国
- 起止时间:2019-12-30 至 2021-12-29
- 项目状态:已结题
- 来源:
- 关键词:AffectApoptosisBiological AssayCell SurvivalCellsChIP-seqChaperone GeneChromatin Remodeling FactorCisplatinClinicalDNADNA BindingDataDatabasesDiagnosisEpigenetic ProcessExhibitsFunctional disorderGene ExpressionGenesGeneticGenetic TranscriptionGoalsHematologic NeoplasmsHomeostasisHumanIn VitroKnock-outKnowledgeLinkMalignant Epithelial CellMalignant NeoplasmsMalignant neoplasm of ovaryMediator of activation proteinMessenger RNAModelingMusMutateMutationOvarian Clear Cell TumorPatientsPhenotypePlatinumPlayProtein SubunitsProteinsRNA SplicingRefractoryRibonucleasesRoleSWI/SNF Family ComplexSignal PathwaySignal TransductionTestingThe Cancer Genome AtlasTherapeuticTransgenic OrganismsTreatment EfficacyTumor Suppressor ProteinsWestern BlottingXBP1 geneXenograft procedurebasebiological adaptation to stresscancer cellcancer subtypescancer typecell growthcell typechemotherapychromatin remodelingcombinatorialeffective therapyendoplasmic reticulum stressexperimental studyin vivoin vivo Modelinhibitor/antagonistinsightmouse modelmutantneoplastic cellnew therapeutic targetnovelnovel therapeutic interventionnovel therapeuticsoutcome forecastpromoterresponsestandard of caretherapeutic targettherapy outcometranscription factortumortumor growth
项目摘要
Project Summary / Abstract
ARID1A is a DNA binding subunit of the SWI/SNF complex that is mutated in over 50% of ovarian clear cell
carcinoma (OCCC) cases, which results in its loss of expression in over 90% of ARID1A-mutated OCCC
cases. There is an urgent need for effective treatment approaches for ARID1A-mutated OCCCs since
OCCCs are generally refractory to standard agents used to treat ovarian cancer and, when diagnosed in
advanced stages, OCCCs carry the worst prognosis of all ovarian cancer subtypes. The overall goal of my
application is to develop a novel therapeutic approach for ARID1A-mutated OCCCs by targeting the
endoplasmic reticulum (ER) stress response. The ER stress response restores intracellular integrity and
promotes tumor cell survival, which has emerged as a viable therapeutic target for developing cancer
therapeutics. However, whether ARID1A plays a role in regulating the ER stress response has never been
explored. I have discovered that ARID1A mutation drives an increase in the ER stress response in OCCCs.
Using the TCGA database and ARID1A ChIP-seq analysis, my preliminary data suggests that ARID1A
containing SWI/SNF directly represses the transcription of XBP1, a key mediator of the ER stress response.
Consistently, ARID1A mutation correlates with an increase in the ER stress response. I hypothesize that
the SWI/SNF complex suppresses XBP1 expression under ER stress conditions and potentiates the
ER stress response to promote tumor cell survival. I have produced preliminary data showing that the
inhibition of XBP1 signaling reduces OCCC cell growth in an ARID1A status dependent manner. Accordingly,
I have developed two Specific Aims to test my hypothesis. In Aim 1, I will investigate the mechanistic basis
by which ARID1A mutation promotes the ER stress response in OCCCs. I will also explore whether the
inhibition of the ER stress response is selective in ARID1A mutant tumors. In Aim 2, I will determine novel
therapeutic strategies for ARID1A-mutated OCCCs by targeting the ER stress response in combination with
platinum-based chemotherapy that is known to induce ER stress. To my knowledge, this data is the first of
its kind linking ARID1A’s tumor suppressor function to the ER stress response. My data also presents a novel
therapeutic strategy for the inhibition of XBP1 signaling in ARID1A-mutated OCCCs. Since ARID1A is the
most frequently mutated epigenetic regulator across human cancers, the mechanistic insights gained from
the current studies will have broad implications for many different types of cancers as well.
项目总结/摘要
ARID 1A是SWI/SNF复合物的DNA结合亚基,其在超过50%的卵巢透明细胞中突变。
ARID 1A突变的OCCC病例中,其导致超过90%的ARID 1A突变的OCCC中其表达缺失
例 目前迫切需要有效的治疗方法来治疗ARID 1A-突变的OCCCs,因为
OCCCs通常对用于治疗卵巢癌的标准药物是难治的,并且当诊断为
晚期,OCCCs携带所有卵巢癌亚型中最差的预后。
本申请的目的是通过靶向ARID 1A-突变的OCCCs开发一种新的治疗方法,
内质网(ER)应激反应。 ER应激反应恢复细胞内的完整性,
促进肿瘤细胞存活,这已成为发展癌症的可行治疗靶点
然而,ARID 1A是否在调节ER应激反应中起作用从未被研究过。
我已经发现ARID 1A突变驱动OCCCs中ER应激反应的增加。
使用TCGA数据库和ARID 1A ChIP-测序分析,我的初步数据表明,ARID 1A
含有SWI/SNF的蛋白质直接抑制了内质网应激反应的关键介导物XBP 1的转录。
因此,ARID 1A突变与ER应激反应的增加相关。 我假设
SWI/SNF复合物在内质网应激条件下抑制XBP 1表达,并增强细胞内的
ER应激反应,促进肿瘤细胞存活。我已经产生了初步的数据表明,
抑制XBP 1信号传导以ARID 1A状态依赖性方式降低OCCC细胞生长。因此,
我已经制定了两个具体的目标来验证我的假设。在目标1中,我将研究机制基础
ARID 1A突变促进OCCCs的ER应激反应。我还将探讨ARID 1A突变是否会促进OCCCs的ER应激反应。
ER应激反应的抑制在ARID 1A突变肿瘤中是选择性的。 在目标2中,我将确定小说
通过靶向ER应激反应联合
以铂为基础的化疗,已知会诱导ER应激。据我所知,这是第一个
我的数据还提出了一种新的研究方法,
在ARID 1A-突变的OCCCs中抑制XBP 1信号传导的治疗策略。
人类癌症中最常见的突变表观遗传调节因子,从
目前的研究也将对许多不同类型的癌症产生广泛的影响。
项目成果
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