Blood:Bcor剂量不足可促进骨髓增生异常综合征的发生发展

2018-09-21 MedSci MedSci原创

中心点:Bcor剂量不足会促进骨髓增生异常综合征的发生发展。在骨髓增生异常综合征的病理过程中,Bcor剂量不足与Tet2缺失相互协作。摘要:BCOR,编码BCL-6共抑制剂(BCOR),与X染色体连锁,是多种血液恶性肿瘤(包括骨髓增生异常综合征)的体细胞突变靶点。Shiro Tara等人既往发现造血室缺失Bcor4号外显子的小鼠(BcorΔE4/y)会进展出NOTCH依赖性的急性T细胞淋巴细胞白血

中心点:

Bcor剂量不足会促进骨髓增生异常综合征的发生发展。

在骨髓增生异常综合征的病理过程中,Bcor剂量不足与Tet2缺失相互协作。

摘要:

BCOR,编码BCL-6共抑制剂(BCOR),与X染色体连锁,是多种血液恶性肿瘤(包括骨髓增生异常综合征)的体细胞突变靶点。Shiro Tara等人既往发现造血室缺失Bcor4号外显子的小鼠(BcorΔE4/y)会进展出NOTCH依赖性的急性T细胞淋巴细胞白血病(T-ALL)。

现Shiro Tara等人对缺乏Bcor9/10号外显子的小鼠(BcorΔE9-10/y)进行分析,BcorΔE9-10/y小鼠表达C端截短的BCOR,不能与多梳抑制复合物(PRC)1.1的核心效应元件相互作用。BcorΔE9-10/y小鼠表现为致死性T-ALL,与BcorΔE4/y小鼠类似,只不过BcorΔE9-10/y小鼠的粒细胞表现出生长优势,而且敲除Tet2时得到进一步加强。

Tet2Δ/ΔBcorΔE9-10/y小鼠可发展成致死性MDS,伴随进行性贫血和白细胞减少、无效造血和血细胞形态异常。在次级接受者体内,Tet2Δ/ΔBcorΔE9-10/y MDS细胞可产生MDS,或进展成致死性MDS/MPN。

转录谱分析显示Cebpa家族和Hoxa集基因的髓系调控基因在BcorΔE9-10/y前体细胞中脱抑制,P53靶基因在MDS有核红细胞中特异性激活,导致大量细胞凋亡。

总而言之,本研究揭示了BCOR在髓系恶性肿瘤中的肿瘤抑制作用,并强调了Bcor剂量不足对MDS发生发展的影响。


原始出处:

Shiro Tara, et al. Bcor insufficiency promotes initiation and progression of myelodysplastic syndrome. Blood  2018  :blood-2018-01-827964;  doi: https://doi.org/10.1182/blood-2018-01-827964

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    2018-09-21 lietome2

    好文,值得点赞!认真学习,应用于实践!谢谢分享给广大同好!

    0

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骨髓增生异常综合征中西医结合诊疗专家共识(2018年)

骨髓增生异常综合征(MDS)是起源于造血干细胞的一组异质性髓系克隆性疾病,特点是髓系细胞发育异常,表现为无效造血、难治性血细胞减少,高风险向急性髓系白血病(AML)转化。根据其发病特点及临床表现,中医学定义为“髓毒劳” 。“髓”代表病位,“毒”*代表病性,“劳”代表病状。本病病机特点为邪实正虚,虚实夹杂,毒和瘀为邪实,气血阴阳不足为正虚。 目前已有的中西医结合诊治MDS专家共识不能满足临床需要。中