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In utero dietary exposure to endocrine disruptors

子宫内饮食接触内分泌干扰物

基本信息

批准号：
7192451
负责人：
LEENA A. HILAKIVI-CLARKE
金额：
$ 14.72万
依托单位：
GEORGETOWN UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2005
资助国家：
美国
起止时间：
2005-05-01 至 2009-02-28
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/7192451
关键词：
Affect American Anthracenes Apoptosis Aromatase Arthritis Biological Assay Biological Models Biology Breast Cadmium Carcinogens Condition Conscience Consumption DNA Damage Data Development Diabetes Mellitus Diet Dietary Component Eczema Endocrine Endocrine Disruptors Environment Enzyme Immunoassay Estrogen Receptors Estrogens Exposure to Fatty Acids Female Fiber Flax Gene Expression Generations Genes Goals Guidelines Health Heavy Metals Hormonal Human Hypersensitivity Immunohistochemistry Inflammatory Lignans Link Lipid Peroxidation Lipid Peroxides Malignant - descriptor Malignant Neoplasms Mammary Neoplasms Mammary Tumorigenesis Mammary gland Measures Mediating Mus Omega-3 Fatty Acids PCNA gene Pathway interactions Patient currently pregnant Perinatal Exposure Polymerase Chain Reaction Polyunsaturated Fatty Acids Predisposition Pregnancy Property Proteins Psoriasis Puberty Rattus Reactive Oxygen Species Receptor Signaling Reporting Research Personnel Risk Rodent Model Serum Signal Pathway Sprague-Dawley Rats TP53 gene Time Tumor Suppressor Genes Wheat World Health Organization anthracene attenuation cancer risk cardiovascular disorder risk feeding fetal in utero insight malignant breast neoplasm repaired secoisolariciresinol secoisolariciresinol diglucoside

项目摘要

DESCRIPTION (provided by applicant): Elevated in utero hormonal environment may increase later susceptibility to develop breast cancer, both in human and rodent models. Our goal has been to identify dietary components that, when fed to pregnant rat dams, results a reduced mammary tumorigenesis among female offspring. Thus, we fed pregnant rats flaxseed diet that contains lignan secoisolariciresinol (SDG), n-3 polyunsaturated fatty acids (PUFAs) and fiber, all that have been linked to reduced breast cancer risk and that potentially reduce serum estrogens. However, we found that female offspring of dams fed 10% flaxseed diet or 15% defatted flaxseed diet during pregnancy were at an increased risk of developing DMBA-induced mammary tumors. This was surprising since their mammary glands contained less targets (terminal end buds, TEBs) for malignant transformation, as also reported by other investigators. The protein component of flaxseed accumulates heavy metal cadmium to the levels exceeding the maximum guidelines set by the World Health Organization. Since cadmium is an endocrine disrupter and activates the estrogen receptor, and it also impairs the ability to repair DMA damage, we hypothesize that in utero exposure to cadmium in flaxseed increases later breast cancer risk. Our study has the following specific aims: (1) determine whether in utero cadmium exposure increases later mammary tumorigenesis; (2) determine whether the presence of lignan SDG, fatty acid n-3 PUFA or fiber modify the effects of in utero cadmium exposure on mammary tumorigenesis; and (3) compare changes in DMA damage repair, including expression of tumor suppressor genes Brcal and p53, and estrogen-induced signaling pathways in rats exposed to flaxseed, cadmium or a combination of cadmium, SDG, n-3 PUFA and fiber in utero. Dietary levels of SDG, n-3 PUFA and fiber will be similar to those present in 10% flaxseed diet. The model system we will use is Sprague Dawley rat exposed to carcinogen DMBA that results mammary tumors that are biologically similar to human breast cancers. Results obtained in this study will provide insight into the mechanisms by which in utero exposure to flaxseed can alter later susceptibility to develop mammary tumors. In particular, we will determine whether in utero exposure to cadmium present at high levels in flaxseed, is the key mediating factor, and whether flaxseed/cadmium's effects involve changes in estrogen receptor signaling or oxidative damage repair or both.

描述（由申请人提供）：在人类和啮齿动物模型中，子宫激素环境中的升高可能会增加以后患乳腺癌的易感性。我们的目标是确定饮食成分，当喂养怀孕的老鼠时，可以减少雌性后代乳腺肿瘤的发生。因此，我们给怀孕大鼠喂食含有木脂素开环异落叶松树脂醇 (SDG)、n-3 多不饱和脂肪酸 (PUFA) 和纤维的亚麻籽饮食，所有这些都与降低乳腺癌风险有关，并可能降低血清雌激素水平。然而，我们发现在怀孕期间饲喂 10% 亚麻籽日粮或 15% 脱脂亚麻籽日粮的母鼠雌性后代患 DMBA 诱发的乳腺肿瘤的风险增加。这是令人惊讶的，因为正如其他研究人员所报道的那样，它们的乳腺含有较少的恶性转化靶点（终末芽，TEB）。亚麻籽的蛋白质成分累积的重金属镉含量超过了世界卫生组织设定的最高指导值。由于镉是一种内分泌干扰物，会激活雌激素受体，并且还会损害修复 DMA 损伤的能力，因此我们推测，在子宫内接触亚麻籽中的镉会增加日后患乳腺癌的风险。我们的研究有以下具体目的：（1）确定子宫内镉暴露是否会增加后期乳腺肿瘤的发生； (2)确定木脂素SDG、脂肪酸n-3 PUFA或纤维的存在是否改变子宫内镉暴露对乳腺肿瘤发生的影响； (3) 比较子宫内暴露于亚麻籽、镉或镉、SDG、n-3 PUFA 和纤维组合的大鼠中 DMA 损伤修复的变化，包括肿瘤抑制基因 Brcal 和 p53 的表达，以及雌激素诱导的信号通路。 SDG、n-3 PUFA 和纤维的膳食水平将与 10% 亚麻籽膳食中的水平相似。我们将使用的模型系统是暴露于致癌物质 DMBA 的 Sprague Dawley 大鼠，该模型会产生与人类乳腺癌生物学相似的乳腺肿瘤。这项研究获得的结果将深入了解子宫内接触亚麻籽可以改变以后患乳腺肿瘤的易感性的机制。特别是，我们将确定子宫内暴露于亚麻籽中高含量的镉是否是关键的调节因素，以及亚麻籽/镉的影响是否涉及雌激素受体信号传导或氧化损伤修复或两者的变化。