Carcinogenic Metabolites Formed from Antiestrogen

抗雌激素形成的致癌代谢物

• 批准号: 8074410
• 负责人: Judy L Bolton
• 金额: $ 22.3万
• 依托单位: UNIVERSITY OF ILLINOIS AT CHICAGO
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-08 至 2014-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8074410
• 关键词: Adverse effects; Affinity Chromatography; Alkylation; Alzheimer' s Disease; Avidin; Biological; Biological Assay; Biotin; Breast; Breast Cancer Prevention; Carcinogens; Cardiovascular Diseases; Cell Line; Cell Respiration; Cells; Characteristics; Chemistry; Chemopreventive Agent; Clinic; Clinical; Clinical Trials; DNA; DNA Adducts; DNA Damage; Development; Electrophoresis; Endometrial; Endometrial Carcinoma; Endometrium; Enzymes; Equus caballus; Estrogen Antagonists; Estrogen Receptor Modulators; Estrogens; Generations; Health; Heart; Heat shock proteins; Histones; Hormonal; Hormones; Hot flushes; Implant; Incidence; Laboratories; Lasofoxifene; Lesion; Ligation; Link; Literature; Liver; Malignant Neoplasms; Mammary gland; Methodology; Modification; Naphthols; National Surgical Adjuvant Breast and Bowel Project; Nuclear Proteins; Nude Mice; O-(biotinylcarbazoylmethyl)hydroxylamine; Osteoporosis; Oxidation-Reduction; Parents; Pharmaceutical Preparations; Placebos; Postmenopause; Protein Disulfide Isomerase; Proteins; Quinones; Raloxifene; Rattus; Reaction; Relative (related person); Reporting; Risk; Selective Estrogen Receptor Modulators; Site; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; Staging; Structure; Study models; Subcellular Fractions; Sulfur; Tamoxifen; Testing; Time; Tissues; Triphenylethylene; Woman; Women' s Health; Work; adduct; analog; base; behavior influence; benzothiophene; bone; carcinogenesis; carcinogenicity; cell transformation; cellular targeting; design; drug development; high risk; malignant breast neoplasm; metaplastic cell transformation; nervous system disorder; novel; oxidation; prevent; quinone methide; research study; stress protein; tumor

DESCRIPTION (provided by applicant): Development of the "perfect" selective estrogen receptor modulator (SERM) is of paramount importance in postmenopausal women's health. The beneficial and undesirable side effects of SERMs are directly analogous to estrogens, which are known carcinogens through a mechanism involving oxidative metabolism to redox active/electrophilic quinoids. We hypothesize that the adverse effects of SERMs are also related to their oxidative metabolism to quinoids. Whether these quinoids are detrimental are unknown at this time and it is the focus of this proposal to determine the effect of structure on these mechanisms in an effort to provide crucial information leading to the development of the "perfect" SERM. The specific aims are: 1. Effect of structure on the formation and reactivity of SERM quinoids. We have shown that classical quinone methides, di-quinone methides, and o-quinones are produced from triphenylethylene, benzothiophene, and miscellaneous SERMs. We plan to examine the relative abilities of new classes of SERMs such as bazodoxifene and lasofoxifene as well as the Lilly naphthol analogs to be oxidized to quinoids. The rate of formation, type of quinoid, as well as their reactivity will be studied in subcellular fractions and Ishikawa endometrial cells. 2. What are the protein targets of SERM quinoids? In the current proposal, we plan to use the COATag methodology and "click chemistry" or modified Staudinger ligation approaches to examine protein covalent modification in rat mammary subcellular fractions and Ishikawa cells. The targeted proteins will be isolated using avidin affinity chromatography, separated by 2D electrophoresis, digested, and analyzed by MALDI-TOF and LC-MS-MS. We predict that the reactivity of SERM quinoids will have a strong influence on which proteins are modified as well as sites of protein alkylation within the target proteins. 3. Do SERM quinoids modify DNA and induce cellular transformation? This aim will focus on how the type and reactivity of SERM quinoid formed will dictate the extent of DNA damage. Initial model studies with deoxynucleosides and DNA will allow characterization of stable DNA adducts, analysis of depurinating adducts, as well as determination of DNA oxidation. We will then analyze SERM-induced DNA damage in Ishikawa cell lines. Apurinic sites (AP) will be directly quantified using the aldehyde reactive probe assay and the transversions and transitions resulting from these mutagenic lesions will be detected by mismatch-capture methodology. Finally, transformation studies will be performed in MCF-10A cells and the transformed clones will be implanted into athymic nude mice to investigate their ability to induce tumor formation. These studies will elucidate the relative importance of quinoid formation and cellular targets for each SERM, thereby enabling correlations of reactivity with structure from which general principles influencing the behavior of SERM quinoids in cells will emerge. PUBLIC HEALTH RELEVANCE: Development of the "perfect" SERM is of paramount importance in postmenopausal women's health in order to prevent osteoporosis, cardiovascular disease, and hot flashes. However, some SERMs increases the risk of some cancers through formation of reactive compounds. It is the focus of this proposal to investigate these potentially carcinogenic reactive compounds in an effort to provide crucial information leading to the development of the "perfect" SERM.

描述（由申请人提供）：“完美”选择性雌激素受体调节剂（SERM）的开发对于绝经后妇女的健康至关重要。 SERM 的有益和不良副作用与雌激素直接类似，雌激素通过涉及氧化代谢为氧化还原活性/亲电醌类化合物的机制而被称为致癌物。我们假设 SERM 的不良反应也与其氧化代谢为醌类化合物有关。目前尚不清楚这些醌类化合物是否有害，本提案的重点是确定结构对这些机制的影响，以努力提供导致“完美”SERM 开发的关键信息。具体目标是： 1.结构对SERM醌类化合物形成和反应性的影响。我们已经证明，经典的醌甲基化物、二醌甲基化物和邻醌是由三苯乙烯、苯并噻吩和其他 SERM 产生的。我们计划研究新型 SERM 的相对能力，例如巴佐多昔芬和拉索昔芬以及礼来萘酚类似物被氧化为醌类化合物的能力。将在亚细胞部分和石川子宫内膜细胞中研究醌类化合物的形成速率、类型及其反应性。 2. SERM 醌类化合物的蛋白质靶点是什么？在当前的提案中，我们计划使用 COATag 方法和“点击化学”或改良的施陶丁格连接方法来检查大鼠乳腺亚细胞组分和 Ishikawa 细胞中的蛋白质共价修饰。将使用亲和素亲和层析分离目标蛋白，通过 2D 电泳分离、消化并通过 MALDI-TOF 和 LC-MS-MS 进行分析。我们预测 SERM 醌类化合物的反应性将对哪些蛋白质被修饰以及目标蛋白质内的蛋白质烷基化位点产生强烈影响。 3. SERM 醌类化合物是否会修饰 DNA 并诱导细胞转化？这一目标将集中于 SERM 醌型化合物的类型和反应性如何决定 DNA 损伤的程度。脱氧核苷和 DNA 的初步模型研究将能够表征稳定的 DNA 加合物、分析脱嘌呤加合物以及测定 DNA 氧化。然后我们将分析 Ishikawa 细胞系中 SERM 诱导的 DNA 损伤。无嘌呤位点（AP）将使用醛反应探针测定直接定量，并且由这些诱变损伤引起的颠换和转变将通过错配捕获方法检测。最后，将在MCF-10A细胞中进行转化研究，并将转化的克隆植入无胸腺裸鼠中以研究其诱导肿瘤形成的能力。这些研究将阐明每种SERM的醌型形成和细胞靶标的相对重要性，从而使反应性与结构相关联，从中得出影响SERM醌型在细胞中行为的一般原理。公共健康相关性：“完美”SERM 的开发对于绝经后妇女的健康至关重要，可以预防骨质疏松症、心血管疾病和潮热。然而，一些 SERM 通过形成反应性化合物而增加患某些癌症的风险。该提案的重点是研究这些潜在的致癌活性化合物，以期为“完美”SERM 的开发提供重要信息。