Precocious immune senescence induced by pre- & postnatal atrazine exposure

预免疫诱导的早熟免疫衰老

• 批准号: 7844996
• 负责人: John B Barnett
• 金额: $ 18.31万
• 依托单位: WEST VIRGINIA UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-05-15 至 2011-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7844996
• 关键词: Acute; Address; Adult; Affect; Age; Age-Months; Agriculture; Americas; Animals; Atrazine; Autoimmune Diseases; B-Lymphocytes; Barker Hypothesis; Bathing; Cell physiology; Cells; Chemical Exposure; Child; Cytotoxic T-Lymphocytes; Data; Deterioration; Development; Dose; Elderly; Environment; Environmental Exposure; Exposure to; Female; Fetus; Fogs; Fostering; Funding; Goals; Grant; Herbicides; Human; Immune; Immune response; Immune system; Intervention; Knowledge; Laboratories; Life; Long-Term Effects; Lymphocyte; Lymphocyte Function; Manufacturer Name; Mothers; Mus; National Institute of Environmental Health Sciences; Neonatal; Occupational Health; Partner in relationship; Poison; Population; Predisposition; Pregnancy; Pregnant Women; Procedures; Publishing; Regulatory T-Lymphocyte; Research; Risk; Role; Seasons; Societies; Source; Staging; Symptoms; Systemic Lupus Erythematosus; T cell response; T-Lymphocyte; Testing; Time; Toxic effect; Triazines; United States; United States Environmental Protection Agency; United States National Institutes of Health; Water; Xenobiotics; age related; aged; base; design; effectiveness research; falls; ground water; high risk; immune function; immunotoxicity; land use; male; neonate; offspring; postnatal; prenatal; prenatal exposure; public health relevance; response; senescence; sex

DESCRIPTION (provided by applicant): NIEHS has a research mandate to understand the role of the environment on the fetal basis of adult disease. We believe that there are a number of facts, in addition to our preliminary data (3); that make a study of the developmental immunotoxicity of atrazine compelling. One, atrazine is both the most heavily used single herbicide employed in USA agriculture at this time and, the most common herbicide contaminant detected in ground water in the USA (http://water.usgs.gov/nawqa). Thus, there is ample risk that the children will be exposed during gestational development or neonatally via the mother's ingestation or bathing in atrazine-contaminated water during pregnancy. Two, there are few published developmental immunotoxicological studies using atrazine. Three, atrazine has been previously shown to affect prenatal development in humans (5, 6). Finally, this research could open the way for mothers' to ameliorate the damage to their fetus by changing water sources, for example. This would also set the stage for others to address intervention effectiveness research in occupational health. Few studies have been performed on the effect of atrazine on the developing immune system. Our preliminary data demonstrated a significant increase in the B cell response, mixed lymphocyte response and cytotoxic T-lymphocyte response of 3 month old male Balb/C mice that were exposed prenatally/lactationally (P/L) to atrazine in an experimental paradigm where the dam received environmentally relevant doses of atrazine via a time-release pellet. The increases in immune function in P/L atrazine males may put them at higher risk to developing autoimmune diseases, e.g., systemic lupus erythematosus, similar to that seen in females. Based on our preliminary P/L atrazine exposure studies, we hypothesize that exposure of Balb/C mice to atrazine during the prenatal, neonatal or a combination period of development induces long term functional changes in their T-cells. We plan to address this hypothesis via the following specific aims. Specific Aim 1: Establish the longitudinal effects of P/L atrazine exposure on the immune system of the offspring. The hypothesis for this specific aim is that P/L atrazine exposure causes precocious immune senescence. Specific Aim 2: Identify the mechanism of the altered immune function at 3 and 6 moa caused by P/L atrazine exposure. PUBLIC HEALTH RELEVANCE 1Atrazine is one of the most heavily used herbicides in the United States of America (USA) with approximately 80 million pounds applied to crops during a growing season. Atrazine and its metabolites are the most common water contaminant in the USA. There have been numerous adult studies done to determine any overt toxic effects of this compound. However, there have been very few studies that study the effects of this compound on the developing fetus even though it is well recognized that fetuses and neonates are exquisitely sensitive to toxic compounds and often have a different array of symptoms that exposed adults. Our preliminary data indicates that the effect of prenatal and lactational exposure to atrazine causes both sex and age-dependent effects on the immune system. Our long range goal is to understand the mechanism of these effects and determine if these animals continue to show a deterioration of their immune response over a 1 year period; a phenomenon that we have termed `precocious immune senescence'.

描述（由申请人提供）：NIEHS 的研究任务是了解环境对胎儿成人疾病的影响。我们认为，除了我们的初步数据（3）之外，还有许多事实；这使得阿特拉津的发育免疫毒性研究引人注目。第一，莠去津既是目前美国农业中使用最频繁的单一除草剂，也是美国地下水中检测到的最常见的除草剂污染物 (http://water.usgs.gov/nawqa)。因此，儿童在妊娠发育期间或新生儿时期因母亲在怀孕期间摄入或沐浴在受阿特拉津污染的水中而暴露于阿特拉津的风险很大。第二，很少有发表的使用莠去津的发育免疫毒理学研究。第三，阿特拉津先前已被证明会影响人类的产前发育 (5, 6)。最后，这项研究可以为母亲通过改变水源等方式减轻对胎儿的伤害开辟道路。这也将为其他人解决职业健康干预有效性研究奠定基础。关于莠去津对免疫系统发育的影响的研究很少。我们的初步数据表明，在产前/哺乳期 (P/L) 暴露于莠去津的 3 个月大雄性 Balb/C 小鼠的 B 细胞反应、混合淋巴细胞反应和细胞毒性 T 淋巴细胞反应显着增加，其中大坝通过缓释颗粒接受了环境相关剂量的莠去津。 P/L 阿特拉津男性免疫功能的增强可能会使他们患自身免疫性疾病的风险更高，例如系统性红斑狼疮，与女性相似。根据我们初步的 P/L 阿特拉津暴露研究，我们假设 Balb/C 小鼠在产前、新生儿或发育的联合时期暴露于阿特拉津会诱导其 T 细胞的长期功能变化。我们计划通过以下具体目标来解决这一假设。具体目标 1：确定 P/L 阿特拉津暴露对后代免疫系统的纵向影响。针对这一特定目标的假设是，P/L 阿特拉津暴露会导致免疫早衰。具体目标 2：确定 P/L 阿特拉津暴露导致 3 和 6 moa 免疫功能改变的机制。 公众健康相关性 1莠去津是美国最常用的除草剂之一，在作物生长季节使用量约为 8000 万磅。阿特拉津及其代谢物是美国最常见的水污染物。已经进行了大量的成人研究来确定这种化合物的任何明显的毒性作用。然而，尽管众所周知，胎儿和新生儿对有毒化合物非常敏感，并且通常会出现一系列与成人接触后不同的症状，但很少有研究研究这种化合物对发育中胎儿的影响。我们的初步数据表明，产前和哺乳期接触阿特拉津会对免疫系统产生性别和年龄依赖性影响。我们的长期目标是了解这些影响的机制，并确定这些动物的免疫反应是否在一年内继续恶化；我们将这种现象称为“免疫早衰”。