Gene expression profile in the liver of Rana catesbeiana tadpoles exposed to low temperature in the presence of thyroid hormone.

Gene expression profile in the liver of Rana catesbeiana tadpoles exposed to low temperature in the presence of thyroid hormone.
复制标题

在甲状腺激素存在下暴露于低温的林蛙蝌蚪肝脏中的基因表达谱。

DOI:
10.1016/j.bbrc.2012.03.085
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发表时间:
2012
期刊:
Biochem. Biophys. Res. Commun.
影响因子:
--
通讯作者:
K.
K.
中科院分区:
--
文献类型:
--
作者:
Mochizuki;K.;Goda;T.;Yamauchi;K.

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两栖动物的变态受甲状腺激素(TH)控制,对温度高度敏感。采用实时荧光定量聚合酶链式反应技术,研究了28℃和4℃条件下经5 nm 3,3‘,5-三碘甲腺原氨酸(T3)处理的中国林蛙蝌蚪肝脏的基因表达谱。在测试的48个基因中,有12个基因在4℃时在T3处理或未处理的蝌蚪中上调。这些基因包括与能量代谢、转录和翻译有关的基因。4个TH反应基因,包括TH受体β(TH受体β)基因,在4℃下对T3没有反应,脱碘酶III是唯一在4℃下下调的基因。染色质免疫沉淀分析表明,冷暴露下CCAAT/增强子结合蛋白2基因的激活与组蛋白H3在赖氨酸9上的乙酰化增加有关,而在28℃下由T3激活的TRβ基因与组蛋白H3在赖氨酸36上的甲基化增加有关,而在冷暴露下组蛋白H3的甲基化状态没有依赖于T3的变化。我们的结果表明,TH信号向染色质修饰的转移在初级早期TH反应基因上被寒冷的暴露特异性地阻断。
Amphibian metamorphosis, which is controlled by thyroid hormone (TH), is highly temperature-sensitive. Using real-time PCR, we investigated the gene expression profile in the liver of Rana catesbeiana tadpoles kept at 28 and 4°C and treated with 5nM 3,3′,5-triiodothyronine (T3). Out of the 48 genes tested, 12 were up-regulated at 4°C in T3-treated or untreated tadpoles. These included genes involved in energy metabolism, transcription, and translation. Four TH-response genes, including TH receptor β (TRβ) gene, showed no response to T3 at 4°C. Deiodinase III was the only gene down-regulated at 4°C. Chromatin immunoprecipitation assays showed that CCAAT/enhancer-binding protein 2 gene activation by cold exposure was associated with an increase in the acetylation of histone H3 at lysine 9, whereas TRβ gene activation by T3 at 28°C was associated with an increase in the methylation of histone H3 at lysine 36 with no T3-dependent changes in methylation states on cold exposure. Our results suggest that the transfer of TH signal to chromatin modifications on a primary early TH response gene was specifically blocked by exposure to cold.
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