Blood:GPS2通过调控EKLF蛋白稳定性促进红系分化

2020-06-06 QQY MedSci原创

本研究通过人CD34+细胞和GPS2敲除小鼠,阐明了之前未知的GPS2在红细胞分化中的作用; GPS2与EKLF相互作用并阻止其降解,该结果为KLF1功能不全引起的血液疾病提供了新的认识。

红细胞生成是一个复杂的多阶段过程,包括早期红系祖细胞向去核成熟红细胞分化,在该过程中其系谱特异性转录因子发挥重要作用。红细胞kruppel样因子(EKLF/KLF1)是红细胞正常成熟所必需的多效性红细胞转录因子,其表达和激活受时间和分化阶段特异性的严格控制。

近期,研究人员发现了G蛋白信号通路抑制因子2(GPS2)在红系细胞分化中的一个新功能;GPS2是NCoR/SMRT核受体辅抑制因子复合物的一个亚单位。

该研究发现敲低GPS2可显著抑制体外培养和移植到NOD/SCID/IL2Rγnull(NSG)小鼠的人CD34+细胞的红系分化。此外,敲除小鼠的GPS2可导致胎鼠肝脏的红细胞生成受损,导致严重贫血。流式细胞分析和Wright-Giemsa染色显示Gps2-/-胚胎红细胞生成的晚期分化存在缺陷。

机制上,GPS2与EKLF相互作用,阻断EKLF的蛋白酶体介导的降解,进而增加EKLF的稳定性和翻译活性。而且,研究人员还明确EKLF蛋白的第191-230位氨基酸区域,是GPS2与其结合的部位;该区域在哺乳动物中高度保守,对EKLF蛋白的稳定性至关重要。

总而言之,该研究揭示了GPS2的一个既往未知的作为翻译后调节因子的作用,即增强EKLF蛋白的稳定性,促进红细胞分化。

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    2020-06-18 changfy
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    2020-09-01 ms7000001395190706

    很棒

    0

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