Developing a targeted chemoprevention strategy for Non-Small Cell Lung Cancer
制定非小细胞肺癌的靶向化学预防策略
基本信息
- 批准号:9170948
- 负责人:
- 金额:$ 35.23万
- 依托单位:
- 依托单位国家:美国
- 项目类别:
- 财政年份:2016
- 资助国家:美国
- 起止时间:2016-08-15 至 2021-07-31
- 项目状态:已结题
- 来源:
- 关键词:ABL1 geneABL2 geneAddressBindingBiologyCarcinomaCell ProliferationCell SurvivalCellsChemopreventionComplexDevelopmentE-CadherinEnvironmentEpithelialGoalsHistologicImmunofluorescence ImmunologicInjuryLeadLesionLibrariesLungMalignant neoplasm of lungMass Spectrum AnalysisMutateMutationNatural regenerationNon-Small-Cell Lung CarcinomaNuclearPathway interactionsPatientsPharmaceutical PreparationsPhosphorylationPhosphorylation SitePhosphotransferasesPreclinical Drug EvaluationPremalignantProcessProteinsResearchResolutionRoleSignal PathwaySignal TransductionSiteSite-Directed MutagenesisSmall Interfering RNASmokingStaining methodStainsStem cellsTissue MicroarrayTissuesToxic effectTyrosineTyrosine Phosphorylation Siteabstractingairway epitheliumbeta catenincancer subtypesinjury and repairnovel chemopreventionnovel strategiespreventrepairedself-renewalsmall molecule
项目摘要
Project Summary/Abstract
Lung cancer is thought to develop in a stepwise fashion giving us the opportunity to intervene before it becomes
invasive. A novel approach to cure patients of lung cancer is therefore to develop a targeted chemoprevention
strategy to prevent the formation of lung premalignant lesions in the first place. My lab studies airway basal stem
cells (ABSCs) and the signaling pathways involved in their repair and regeneration after injury. Our studies led
us to the conclusion that premalignancy represents a state of excessive self-renewal of ABSCs with a block in
differentiation and we identified several mechanisms involved in stepwise progression to Squamous Lung
Cancer. One such mechanism involves proliferation of ABSCs via the Wnt-β-catenin pathway and in particular
we found that only one of the differential phosphorylation sites, the tyrosine Y489 residue of the β-catenin protein,
allowed nuclear localization of β-catenin with concomitant TCF/LEF activation for proliferation. We found that
phosphorylation of other classically described β-catenin phosphorylation sites only resulted in membranous
localization of β-catenin. The phosphorylation of β-catenin at Y489 (p-β-cateninY489) is not present in normal
airway ABSCs and is turned on only briefly during normal repair after injury, but it persists in premalignant lesion
ABSCs and in a subset of cells in Squamous Lung Cancer (SLC).
Our goal is to understand the mechanisms that drive phosphorylation of β-catenin at Y489 and discover
compounds to prevent this process. This will allow us to prevent the excessive proliferation of premalignancy
and develop a novel chemoprevention strategy for SLC. We will achieve this goal with the following aims:
Specific Aim 1: To understand the role of p-β-cateninY489 in proliferation of ABSCs, premalignant lesions and
lung cancers. We hypothesize that p-β-cateninY489 is a common mechanism for proliferation in all histologic
subtypes of lung cancer.
Specific Aim 2: To identify the kinase/s responsible for phosphorylation of β-cateninY489 site in ABSCs. We
hypothesize that there are specific kinase/s that phosphorylate β-catenin at the Y489 site which drives
proliferation of ABSCs to form premalignant lesions.
Specific Aim 3: To identify compounds that prevent p-β-cateninY489. We will perform a targeted screen of
compounds that prevent TCF/LEF activation in ABSCs along with a toxicity screen. This will allow us to identify
compounds that inhibit proliferation but are not toxic to ABSCs. Lead compounds from this primary screen will
be taken to a secondary screen with immunofluorescence for p-β-cateninY489.
Our highly accomplished research team, the outstanding environment at UCLA and the important biology that is
being addressed in this proposal all provide a high likelihood that this NCI Provocative Question 1 will be
answered for targeting premalignancy in Non-Small Cell Lung Cancer and lead to the development of a targeted
chemoprevention strategy for Lung Cancer that will save millions of lives.
项目总结/摘要
肺癌被认为是以一种逐步的方式发展的,这使我们有机会在它成为癌症之前进行干预。
因此,一种治疗肺癌患者的新方法是开发靶向化学预防
首先预防肺癌前病变形成的策略。我的实验室研究气道基底干
细胞(ABSC)和参与其损伤后修复和再生的信号通路。我们的研究
我们得出的结论是,癌前病变代表了ABSC过度自我更新的状态,
分化,我们确定了几种机制参与逐步进展到鳞状肺
一种这样的机制涉及ABSC通过Wnt-β-catenin途径的增殖,特别是
我们发现只有一个差异磷酸化位点,β-catenin蛋白的酪氨酸Y 489残基,
允许β-catenin的核定位,伴随着TCF/LEF的增殖激活。
其他经典描述的β-catenin磷酸化位点的磷酸化仅导致细胞膜的
β-β-catenin在Y 489的磷酸化(p-β-catenin Y 489)不存在于正常人中。
在损伤后的正常修复过程中,气道ABSC仅短暂开启,但在癌前病变中持续存在
ABSC和鳞状肺癌(SLC)中的细胞亚群。
我们的目标是了解驱动β-catenin Y 489磷酸化的机制,
这将使我们能够防止癌前病变的过度增殖,
并开发一种新的SLC化学预防策略。我们将通过以下目标实现这一目标:
具体目的1:了解p-β-cateninY 489在ABSCs增殖、癌前病变和细胞凋亡中的作用。
我们假设p-β-cateninY 489是所有组织学肿瘤中增殖的共同机制,
肺癌的早期症状
具体目的2:鉴定ABSCs中β-cateninY 489位点磷酸化的激酶,
假设在Y 489位点存在磷酸化β-catenin特异性激酶,
ABSC增殖形成癌前病变。
具体目标3:鉴定阻止β-β-cateninY 489的化合物。
在ABSC中阻止TCF/LEF活化的化合物沿着毒性筛选。这将使我们能够识别
抑制增殖但对ABSC无毒的化合物。来自该初步筛选的先导化合物将
用免疫荧光法对β-β-cateninY 489进行二次筛选。
我们高度成就的研究团队,在加州大学洛杉矶分校的优秀环境和重要的生物学,
本提案中所涉及的所有问题都提供了很高的可能性,即NCI挑衅性问题1将被
针对非小细胞肺癌的癌前病变,
肺癌的化学预防策略,将挽救数百万人的生命。
项目成果
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