Blood:孤核受体TR4调控红系细胞的增殖和成熟。

2017-10-12 qinqiyun MedSci原创

孤核受体TR4(NR2C2)和TR2(NR2C1)是大分子复合物的DNA结合域,已证实其在成人红细胞生成过程中抑制e-和γ-球蛋白转录。既往研究认为TR2和TR4在红系细胞分化过程中主要是多余的存在。

中心点:

TR4和TR2在胚胎发育和红系细胞分化过程中发挥独特的功能。

TR4促进红系细胞增殖和成熟。

摘要:

孤核受体TR4(NR2C2)和TR2(NR2C1)是大分子复合物的DNA结合域,已证实其在成人红细胞生成过程中抑制e-和γ-球蛋白转录。既往研究认为TR2和TR4在红系细胞分化过程中主要是多余的存在。

然而,现在研究人员在Tr4突变中发现多个不稳定的渗透性表型,提示突变的间接影响可能被多个修饰基因所掩盖。

为验证这一假设,用C57BL/6小时建立Tr4+/-突变鼠模型,对其表型进行重新检测。

研究人员意外地发现纯合Tr4无意突变小鼠在胚胎发育过程中大致在E7.0天停止发育,在红细胞开始生成之前。此外,还发现Tr4+/-小鼠的红系细胞不能完全分化,而且增殖能力减弱。

经过对Tr4+/-红系细胞分析发现TR4的减少会导致亚铁血红素合成和红系细胞分化(Alad和Alas2)所需要的基因表达下调,与此同时,增殖抑制因子——细胞周期依赖性激酶抑制剂(Cdkn1c)——表达量显着上调。

上述结果表明TR4在红系细胞增殖和成熟过程中发挥至关重要的作用,提示TR4和TR2在胚胎发育和红系细胞分化过程中发挥独特的功能。

原始出处:

Mary P.Lee,et al.The orphan nuclear receptor TR4 regulates erythroid cell proliferation and maturation.Blood.October 10,2017. https://doi.org/10.1182/blood-2017-05-783159

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    2017-10-14 ysjykql
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    2017-10-12 139****0239

    henhao

    0

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    2017-10-12 1ddf0692m34(暂无匿称)

    学习了.涨知识

    0