Blood:CUX1表达不足可破坏HSC稳态,促进MDS发生,并影响其严重程度

2018-03-29 MedSci MedSci原创

中心点:CUX1缺陷可导致一过性的克隆扩张,随后出现HSC衰竭、贫血和三系发育不良。CUX1转录调控造血干细胞静止、增殖和谱系特异性。摘要:7号染色单体(-7)和del(7q)是髓系恶性肿瘤常见的高危的细胞遗传异常。既往研究报道CUX1是7q22上编码的一个同源基因转录因子,在髓系肿瘤中常被失活,此外,从人类到果蝇均具有CUX1髓系肿瘤抑制活性。CUX1失活性突变常发生于不定性克隆造血(CHIP)

中心点:

CUX1缺陷可导致一过性的克隆扩张,随后出现HSC衰竭、贫血和三系发育不良。

CUX1转录调控造血干细胞静止、增殖和谱系特异性。

摘要:

7号染色单体(-7)和del(7q)是髓系恶性肿瘤常见的高危的细胞遗传异常。既往研究报道CUX1是7q22上编码的一个同源基因转录因子,在髓系肿瘤中常被失活,此外,从人类到果蝇均具有CUX1髓系肿瘤抑制活性。CUX1失活性突变常发生于不定性克隆造血(CHIP)和恶性髓系肿瘤,可独立性地恶化预后。

为明确CUX1在造血过程的作用,Ningfei An等人建立了两个以shRNA为基础的小鼠模型,CUX1蛋白的残余量分别大约是54%(Cux1 mid)和12%(Cux1 low)。Cux1 mid小鼠发生骨髓增生异常综合症/骨髓增生性肿瘤(MDS/MPN)和贫血。对于患病的小鼠,恢复其CUX1的表达水平可有效逆转其所患疾病。CUX1敲除的接受骨髓移植的小鼠表现为一过性的造血扩增,随后造血干细胞(HSCs)减少,并出现致死性骨髓衰竭(剂量依赖性方式)。对敲除CUX1的人类CD34+细胞进行RNA测序证实存在-7/del(7q)MDS基因特征,并且分化、增殖和PI3K信号通路均发生改变。功能分析:CUX1维持HSC静止、抑制其增殖。上述稳态变化与PI3K抑制剂Pik3ip1的表达减少同时发生,CUX1敲除时PI3K/AKT信号增强。

本研究数据表明敲除CUX1可增强PI3K信号,驱动HSC从静止状态进入增殖状态,从而导致HSC耗竭。此外,本研究还证实减少单个7q基因,Cux1,就足以导致小鼠患MDS。

原始出处:

Ningfei An,et al.1. Gene dosage effect of CUX1 in a murine model disrupts HSC homeostasis and controls the severity and mortality of MDS.Blood  2018  :blood-2017-10-810028;  doi: https://doi.org/10.1182/blood-2017-10-810028

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    2019-02-19 d830372
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    2018-08-22 changfy
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    2018-11-17 斯嘉莉
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    2018-07-29 sjq035
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    2018-03-29 1ddf0692m34(暂无匿称)

    学习了.长知识

    0

  6. [GetPortalCommentsPageByObjectIdResponse(id=1842792, encodeId=a7c11842e92a5, content=<a href='/topic/show?id=9f061142249' target=_blank style='color:#2F92EE;'>#MDS#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=34, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=11422, encryptionId=9f061142249, topicName=MDS)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=80a244, createdName=d830372, createdTime=Tue Feb 19 13:25:00 CST 2019, time=2019-02-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1646719, encodeId=82171646e19f6, content=<a href='/topic/show?id=4478e5315e1' target=_blank style='color:#2F92EE;'>#稳态#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=27, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=75315, encryptionId=4478e5315e1, topicName=稳态)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=3ebc23344390, createdName=changfy, createdTime=Wed Aug 22 16:25:00 CST 2018, time=2018-08-22, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1738696, encodeId=33aa1e38696c5, content=<a href='/topic/show?id=122e550e3d' target=_blank style='color:#2F92EE;'>#CUX1#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=39, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=5507, encryptionId=122e550e3d, topicName=CUX1)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=64e134466808, createdName=斯嘉莉, createdTime=Sat Nov 17 18:25:00 CST 2018, time=2018-11-17, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1658600, encodeId=21d816586008c, content=<a href='/topic/show?id=4d06914052' target=_blank style='color:#2F92EE;'>#HSC#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=33, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=9140, encryptionId=4d06914052, topicName=HSC)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f4bd24890262, createdName=sjq035, createdTime=Sun Jul 29 02:25:00 CST 2018, time=2018-07-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=300881, encodeId=a29230088140, content=学习了.长知识, beContent=null, objectType=article, channel=null, level=null, likeNumber=72, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://img.medsci.cn/20220115/46bcf39c32de4aa6b45c5f9d66c8ee77/6cb4a20c55bb4b7691122f47747bfca2.jpg, createdBy=9dad1662329, createdName=1ddf0692m34(暂无匿称), createdTime=Thu Mar 29 15:19:06 CST 2018, time=2018-03-29, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=300873, encodeId=ac0c3008e322, content=阅, beContent=null, objectType=article, channel=null, level=null, likeNumber=78, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=https://cdnapi.center.medsci.cn/medsci/head/2017/09/07/a9772c74ffd6edc03a7f9af07b4747f6.jpg, createdBy=b3722138742, createdName=sunfeifeiyang, createdTime=Thu Mar 29 13:45:45 CST 2018, time=2018-03-29, status=1, ipAttribution=)]
    2018-03-29 sunfeifeiyang

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