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Blood:靶向ROR1递送miR-29b可诱导细胞周期阻滞,有望成为CLL的新疗法

2019-06-02 QQ MedSci原创

慢性淋巴细胞白血病(CLL)主要由两种形式:侵袭性和惰性。在侵袭性CLL中,低miR-29b表达与不良预后相关。在小鼠B细胞系中过表达miR-29b可引发异常,因此,有必要选择性的将miR-29b引入B-CLL细胞中,以获得治疗效益。癌胚抗原ROR1(受体酪氨酸激酶孤儿受体1)在恶性B-CLL细胞上表达,但不在正常B细胞上表达,提示我们可靶向ROR1来递送治疗性miRs。

中心点:

可用于临床的miR-29b在原代CLL细胞和hROR1xTCL1小鼠模型中均展现出强的抗白血病活性。

通过ROR1靶向释放针对白血病的miR-29b可诱导表观遗传重编程和p21依赖性的细胞周期阻滞。

摘要:

慢性淋巴细胞白血病(CLL)主要由两种形式:侵袭性和惰性。在侵袭性CLL中,低miR-29b表达与不良预后相关。在小鼠B细胞系中过表达miR-29b可引发异常,因此,有必要选择性的将miR-29b引入B-CLL细胞中,以获得治疗效益。癌胚抗原ROR1(受体酪氨酸激酶孤儿受体1)在恶性B-CLL细胞上表达,但不在正常B细胞上表达,提示我们可靶向ROR1来递送治疗性miRs。

近期,研究人员发现向ROR1+CLL细胞中靶向递送miR-29b可下调DNMT1和DNMT3A、调节整体DNA甲基化、减少SP1的表达、增加P21的表达。此外,采用表达人ROR1的Eμ-TCL-1小鼠模型,研究人员证实通过下调DNMT1和DNMT3A来进行细胞重编程可提高存活率。

移植的白血病小鼠的基因表达谱显示,靶向miR-29b治疗后,细胞周期调节因子的重新编程降低了SP1的表达,同时增加了p21的表达。该点经导致细胞周期阻滞和存活效益的蛋白质修饰验证。更为重要的是,SP1敲除会导致miR-29b对细胞周期阻滞作用的p21依赖性补偿。

本研究为靶向白血病细胞递送miR-29b作为治疗CLL和其他ROR1+B细胞恶性肿瘤的一种有希望的疗法奠定了基础。

原始出处:

Chi-Ling Chiang, et al. ROR1-targeted delivery of miR-29b induces cell cycle arrest and therapeutic benefit in vivo in CLL mouse model. Blood 2019 :blood.2018882290; doi: https://doi.org/10.1182/blood.2018882290

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    2019-08-24 smallant2002
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    2019-06-07 yjs木玉

    好好好好好好

    0

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    2019-06-04 kcb074
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    2019-06-04 txqjm

    谢谢了,学习

    0

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    2019-06-03 1209e435m98(暂无昵称)

    学习了,谢谢分享

    0

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