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Scientific and Regulatory Policy Committee (SRPC) Points to Consider: Histopathology Evaluation of the Pubertal Development and Thyroid Function Assay (OPPTS 890.1450 OPPTS 890.1500) in Rats to Screen for Endocrine Disruptors

机译:科学与管理政策委员会(SRPC)要考虑的问题:对大鼠青春期发育和甲状腺功能测定(OPPTS 890.1450OPPTS 890.1500)的组织病理学评估以筛查内分泌干扰物

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摘要

The U.S. Environmental Protection Agency Endocrine Disruptor Screening Program (EDSP) is a multitiered approach to determine the potential for environmental chemicals to alter the endocrine system. The Pubertal Development and Thyroid Function in Intact Juvenile/Peripubertal Female and Male Rats (OPPTS 890.1450, 890.1500) are 2 of the 9 EDSP tier 1 test Guidelines, which assess upstream mechanistic pathways along with downstream morphological end points including histological evaluation of the kidneys, thyroid, and select male/female reproductive tissues (ovaries, uterus, testes, and epididymides). These assays are part of a battery of in vivo and in vitro screens used for initial detection of test article endocrine activity. In this Points to Consider article, we describe tissue processing, evaluation, and nomenclature to aid in standardization of assay results across laboratories. Pubertal assay end points addressed include organ weights, estrous cyclicity, clinical pathology, hormonal assays, and histological evaluation. Potential treatment-related findings that may indicate endocrine disruption are reviewed. Additional tissues that may be useful in assessment of endocrine disruption (vagina, mammary glands, and liver) are discussed. This Points to Consider article is intended to provide information for evaluating peripubertal tissues within the context of individual assay end points, the overall pubertal assay, and tier I assays of the EDSP program.
机译:美国环境保护署内分泌干扰物筛查计划(EDSP)是一种多层方法,用于确定环境化学品改变内分泌系统的潜力。完整的少年/青春期雌雄大鼠(OPPTS 890.1450,890.1500)中的青春发育和甲状腺功能是9个EDSP 1级测试指南中的2个,它们评估了上游的机械通路以及下游的形态学终点,包括肾脏的组织学评估,甲状腺,并选择男性/女性生殖组织(卵巢,子宫,睾丸和附睾)。这些测定是用于初步检测测试物品内分泌活性的一系列体内和体外筛选的一部分。在本要点文章中,我们描述了组织处理,评估和术语,以帮助跨实验室的测定结果标准化。青春期化验的终点包括器官重量,发情周期,临床病理,激素化验和组织学评估。审查可能表明内分泌干扰的与治疗相关的潜在发现。讨论了可用于评估内分泌干扰的其他组织(阴道,乳腺和肝脏)。本要点文章旨在提供有关在EDSP程序的各个测定终点,整个青春期测定和I级测定的背景下评估青春期周围组织的信息。

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