Blood:EBV-miR-BHRF1-2-5p微调控PD-L1/PD-L2的扩增

2019-11-07 QQY MedSci原创

EB病毒阳性弥漫性大B细胞淋巴瘤(EBV+DLBCL)表达高水平的程序性死亡蛋白配体PD-L1和PD-L2(PD-L1/PD-L2)。小RNA(miRNA)调节是通过3'UTR靶向进行的基因表达微调控的重要机制,既往研究人员发现在EBV+DLBCL中,EB病毒-小RNA(EBV-miRNA)强表达。

中心点:

EBV-miR-BHRF1-2-5p微调免疫检查点配体PD-L1和PD-L2的LMP1驱动的扩增。

进一步鉴定以miRNA为靶点的免疫检查点或可促进潜在的基于RNA的新疗法出现。

摘要:

EB病毒阳性弥漫性大B细胞淋巴瘤(EBV+DLBCL)表达高水平的程序性死亡蛋白配体PD-L1和PD-L2(PD-L1/PD-L2)。小RNA(miRNA)调节是通过3'UTR靶向进行的基因表达微调控的重要机制,既往研究人员发现在EBV+DLBCL中,EB病毒-小RNA(EBV-miRNA)强表达。

虽然已知EBV潜伏膜蛋白-1 (LMP1)可诱导PD-L1/PD-L2,但EBV- miRNA在微调PD-L1/PD-L2表达中的潜在反调节作用仍有待确定。为了验证这一点,研究人员利用病毒株EBV-WIL建立了一种新的EBV+DLBCL体外模型;与普通实验室菌株不同的是,EBV-WIL保留了几个EBV-miRNAs所在的完整的非编码区域。这使得研究EBV潜伏期基因、细胞起源(COO)、PD-L1、PD-L2和EBV-miRNA之间的关系成为可能。

该模型成功概括了B细胞分化的整个过程,包括四个独立的COO阶段:生发中心B细胞(GCB)的早期和晚期,激活B细胞(ABC)的早期和晚期。有趣地是,随LMP1升高,从GCB晚期向ABC早期转变的过程中,PD-L1/PD-L2的表达水平显著升高。EBV-miR-BHRF1-2-5p与其他EBV-miRNA呈簇状分布,GCB晚期时呈上升趋势。生物信息预测结合功能验证,证实EBV-miR-BHRF1-2-5p与PD-L1和PD-L2 3'UTRs结合,从而降低PD-L1/PD-L2表面蛋白的表达。

综上所述,本研究结果表明EBV-miR-BHRF1-2-5p具有与环境依赖性的反调节作用,可微调LMP1驱动的抑制性免疫检查点配体的扩增,这是一种新的机制。此外,本研究还提示免疫检查点靶向性miRNA或可成为一种潜在的新型的以RNA为基础的治疗方法。

原始出处:

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    2020-05-13 wushaoling
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    2020-04-26 smallant2002
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    2019-11-09 smartjoy
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