Gene expression profiling of the hippocampal dentate gyrus in an adult toxicity study captures a variety of neurodevelopmental dysfunctions in rat models of hypothyroidism

齿状回 海马结构 神经发生 小脑蚓部 神经科学 海马体 生物 神经毒性 内分泌学 内科学 小脑 医学 毒性
作者
Ayako Shiraki,Fumiyo Saito,Hirotoshi Akane,Yumi Akahori,Nobuya Imatanaka,Megu Itahashi,Toshinori Yoshida,Makoto Shibutani
出处
期刊:Journal of Applied Toxicology [Wiley]
卷期号:36 (1): 24-34 被引量:14
标识
DOI:10.1002/jat.3140
摘要

Abstract We previously found that developmental hypothyroidism changed the expression of genes in the rat hippocampal dentate gyrus, a brain region where adult neurogenesis is known to occur. In the present study, we performed brain region‐specific global gene expression profiling in an adult rat hypothyroidism model to see if it reflected the developmental neurotoxicity we saw in the developmental hypothyroidism model. Starting when male rats were 5 weeks old, we administered 6‐propyl‐2‐thiouracil at a doses of 0, 0.1 and 10 mg kg −1 body weight by gavage for 28 days. We selected four brain regions to represent both cerebral and cerebellar tissues: hippocampal dentate gyrus, cerebral cortex, corpus callosum and cerebellar vermis. We observed significant alterations in the expression of genes related to neural development ( Eph family genes and Robo3 ) in the cerebral cortex and hippocampal dentate gyrus and in the expression of genes related to myelination ( Plp1 and Mbp ) in the hippocampal dentate gyrus. We observed only minor changes in the expression of these genes in the corpus callosum and cerebellar vermis. We used real‐time reverse‐transcription polymerase chain reaction to confirm Chrdl1, Hes5 , Mbp , Plp1 , Slit1, Robo3 and the Eph family transcript expression changes. The most significant changes in gene expression were found in the dentate gyrus. Considering that the gene expression profile of the adult dentate gyrus closely related to neurogenesis, 28‐day toxicity studies looking at gene expression changes in adult hippocampal dentate gyrus may also detect possible developmental neurotoxic effects. Copyright © 2015 John Wiley & Sons, Ltd.
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