MOLECULAR CHEMOPREVENTION MECHANISMS OF TEA POLYPHENOLS

茶多酚的分子化学预防机制

• 批准号: 6192184
• 负责人: STEVEN P STRATTON
• 金额: $ 10.65万
• 依托单位: UNIVERSITY OF ARIZONA
• 依托单位国家: 美国
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6192184
• 关键词: RNase protection assay; antioxidants; carcinogenesis inhibitor; cell cycle; cell line; chemoprevention; confocal scanning microscopy; flavonoids; flow cytometry; free radical oxygen; gas chromatography mass spectrometry; keratinocyte; laboratory mouse; lipid peroxides; radiation protection; skin neoplasms; tea; topical drug application; transcription factor; ultraviolet radiation

DESCRIPTION: (Applicant's Description) Prevention is the most efficient way to reduce the incidence, morbidity, Nd mortality of cancer. Thus, development of new investigators in cancer prevention research is imperative. Steven P. Stratton, Ph.D. is a junior investigator in the field of cancer prevention; with training in analytical chemistry, toxicology, pharmacology, cancer therapeutics, cancer drug development, and cancer prevention epidemiology. The mentored training supported by this award will facilitate the development of Dr. Stratton into a fully independent investigator. This project will be conducted at the Arizona Cancer Center, a National Cancer Institute-designated comprehensive cancer center with an international reputation for excellence in cancer prevention research. The proposed studies will be performed under the aegis of the Chemoprevention of Skin Cancer Program Project at the University of Arizona. This project will focus on skin cancer chemoprevention mechanisms with polyphenolic derivatives of tea, Camellia sinensis. Green tea is one of the most widely consumed beverages in the world. Many studies both in vivo and in vitro suggest that polyphenolic compounds present in tea inhibit skin carcinogenesis, though the mechanism of action is still unknown. An understanding of this mechanism is crucial to the development of chemopreventive strategies using these compounds. This project will test the hypothesis that green tea polyphenols prevent UV radiation-induced skin carcinogenesis by modulating reactive oxygen-mediated alterations of normal cell function. Markers of reactive oxygen and secondary membrane damage will be used to explore the role of tea polyphenols in UV-induced skin cell transformation using human keratinocytes in vitro and an in vivo mouse skin model. The specific aims of this project include analyzing the effects of green tea polyphenols on: (1) Cell membrane lipid peroxidation using new sensitive and specific GC/MS assays to quantify levels of oxidized biomolecules; (2) Cell cycle progression and expression of cell cycle control genes using flow cytometry and RNase protection techniques; (3) Regulation of transcription factor activation using an alkaline phosphatase reporter system; and (4) Apoptosis and translocation of relevant transcription factors using in situ molecular imaging techniques. Changes in levels of these markers will be used to establish links between antioxidant effects of tea polyphenols and possible direct effects on redox-sensitive downstream events. The overall goal of this project is to promote the development of an academic research career in cancer prevention within a framework of molecular chemoprevention mechanistic studies and training. Immediate goals include acquiring the scientific and technical expertise necessary for independent investigations of secondary cancer prevention mechanisms. Long-term career goals include development of new methods, assays, and expertise in redox-modulated biochemical processes; establishment of a molecular chemoprevention laboratory; development of collaborative research programs in molecular mechanisms of cancer prevention; and ultimately, development of chemopreventive therapies that reduce cancer morbidity and mortality.

描述：(申请人的描述)预防是最有效的方法 以降低癌症的发病率、发病率和死亡率。因此，发展 在癌症预防研究中引入新的研究人员势在必行。 史蒂文·P·斯特拉顿博士是癌症领域的初级研究员 预防；经过分析化学、毒理学、药理学、 癌症治疗、抗癌药物开发和癌症预防 流行病学。由该奖项支持的导师培训将有助于 斯特拉顿博士成为一名完全独立的调查员。这 该项目将在亚利桑那州癌症中心进行，这是一项国家癌症 研究所指定的综合性癌症中心，拥有国际 在癌症预防研究方面享有卓越的声誉。建议进行的研究 将在皮肤癌化学预防的支持下进行 亚利桑那大学的计划项目。这个项目将专注于皮肤 茶多酚衍生物的癌症化学预防机制， 山茶属植物。绿茶是世界上消费最广泛的饮料之一 整个世界。许多体内和体外研究表明，多酚类物质 茶中存在的化合物抑制皮肤癌的发生，尽管其机制 行动仍不得而知。对这一机制的理解对于 使用这些化合物的化学预防策略的发展。这个项目 将检验绿茶多酚预防紫外线的假设 辐射致皮肤癌变的活性氧调控机制 正常细胞功能的改变。活性氧和次生氧的标志物 膜损伤将被用来探索茶多酚在 紫外线诱导人角质形成细胞转化的体外研究 活体小鼠皮肤模型。该项目的具体目标包括分析 绿茶多酚对：(1)细胞膜脂过氧化的影响 使用新的灵敏和特异的GC/MS分析方法来量化氧化程度 生物分子；(2)细胞周期进程与细胞周期调控的表达 基因的流式细胞术和核糖核酸酶保护技术；(3)调控 利用碱性磷酸酶报告系统激活转录因子； 以及(4)相关转录因子的凋亡和易位。 原位分子成像技术。这些标记物的水平变化将是 用来建立茶多酚的抗氧化作用和 对氧化还原敏感的下游事件可能产生的直接影响。整体而言 该项目的目标是促进一项学术研究的发展 在分子化学预防框架内从事癌症预防工作 机械研究和训练。近期目标包括收购 进行独立调查所需的科学和技术专长 二级癌症预防机制。长期的职业目标包括 氧化还原调节的新方法、新分析和新专业技术的发展 生化过程.分子化学预防方法的建立 实验室；发展分子方面的合作研究计划 癌症预防的机制；并最终发展成 降低癌症发病率和死亡率的化学预防疗法。