EPIGENETIC EFFECT OF METHOXYCHLOR ON OVARIAN DEVELOPMENT

甲氧氯对卵巢发育的表观遗传效应

• 批准号: 7047976
• 负责人: Mehmet Uzumcu
• 金额: $ 19.25万
• 依托单位: RUTGERS, THE STATE UNIV OF N.J.
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7047976
• 关键词: DNA methylation; animal puberty; chlorohydrocarbon insecticide; disease /disorder etiology; disease /disorder onset; embryo /fetus tissue /cell culture; embryo /fetus toxicology; endocrine disrupting compound; environmental exposure; epigenetics; estrus; fertility; gene expression; gonadotropins; hormone regulation /control mechanism; laboratory rat; morphology; oogenesis; organ culture; ovary; ovary disorder; premature aging; reproductive development; reproductive tissue transplantation; terminal nick end labeling

DESCRIPTION (provided by applicant): The broad objective of this proposal is to understand the delayed epigenetic effect of endocrine disrupter methoxychlor (MXC) exposure during fetal/neonatal ovarian development. Epigenetic alterations (e.g., DNA methylation) cause aberrant gene expression, which can lead to major diseases such as cancer. Fetal/ neonatal exposure to estrogenic endocrine disrupters results in uterine and testicular abnormalities in the adult that are linked to DNA methylation changes. Whether similar epigenetic effects occur in the ovary is unknown. The HYPOTHESIS is that transient MXC exposure during fetal/neonatal development directly impairs adult ovarian function by altering early folliculogenesis, DNA methylation, and gene expression. There are 3 specific aims to test this hypothesis. SPECIFIC AIM 1 is to identify the effect of MXC exposure during fetal/neonatal ovarian development on adult ovarian function, morphology, DNA methylation, and gene expression (adult effect). Rats will be treated with MXC perinatally. Pubertal age and adult ovarian functions such as response to gonadotropins, fertility, litter size, and early aging will be assessed. DNA methylation and critical gene expression (e.g., StAR, P450scc, LHR) for adult ovarian function will be examined. SPECIFIC AIM 2 is to determine if the adult effect of MXC results from alterations in folliculogenesis, DNA methylation and gene expression in the fetal/neonatal ovary (fetal basis of adult effect). Early folliculogenesis, DNA methylation, and critical gene expression for ovarian development (bFGF, GDF-9, MIS) will be examined using organ culture. SPECIFIC AIM 3 is to determine whether early MXC exposure directly affects the ovary using organ transplantation (direct effect). This proposal is to investigate whether transient perinatal exposure to the endocrine disrupter MXC directly alters adult ovarian function. The findings will improve our understanding of the fetal basis of epigenetic adult ovarian dysfunction.

描述（由申请人提供）：该提案的主要目标是了解胎儿/新生儿卵巢发育过程中内分泌干扰物甲氧滴滴涕 (MXC) 暴露的延迟表观遗传效应。表观遗传改变（例如 DNA 甲基化）会导致基因表达异常，从而导致癌症等重大疾病。胎儿/新生儿接触雌激素内分泌干扰物会导致成人子宫和睾丸异常，这与 DNA 甲基化变化有关。卵巢中是否发生类似的表观遗传效应尚不清楚。假设是胎儿/新生儿发育期间短暂的 MXC 暴露会通过改变早期卵泡发生、DNA 甲基化和基因表达来直接损害成人卵巢功能。有 3 个具体目标来检验这一假设。具体目标 1 是确定胎儿/新生儿卵巢发育期间 MXC 暴露对成人卵巢功能、形态、DNA 甲基化和基因表达的影响（成人效应）。大鼠将在围产期接受 MXC 治疗。将评估青春期和成人卵巢功能，例如对促性腺激素的反应、生育能力、产仔数和早衰。将检查成人卵巢功能的 DNA 甲基化和关键基因表达（例如 StAR、P450scc、LHR）。具体目标 2 是确定 MXC 的成人效应是否源于胎儿/新生儿卵巢中卵泡发生、DNA 甲基化和基因表达的改变（成人效应的胎儿基础）。将使用器官培养检查早期卵泡发生、DNA 甲基化和卵巢发育的关键基因表达（bFGF、GDF-9、MIS）。具体目标 3 是确定早期 MXC 暴露是否通过器官移植直接影响卵巢（直接效应）。该提案旨在调查围产期短暂接触内分泌干扰物 MXC 是否会直接改变成年卵巢功能。这些发现将提高我们对表观遗传成人卵巢功能障碍的胎儿基础的理解。