J Am Chem Soc:国家纳米中心microRNA精准检测研究取得进展

2019-04-25 不详 国家纳米中心

近日,中国科学院国家纳米科学中心李乐乐课题组在microRNA在体精准检测方面取得新进展。相关研究成果“A NIR Light Gated DNA Nanodevice for Spatiotemporally Controlled Imaging of MicroRNA in Cells and Animals”以封面文章发表在《美国化学会志》上。

近日,中国科学院国家纳米科学中心李乐乐课题组在microRNA在体精准检测方面取得新进展。相关研究成果“A NIR Light Gated DNA Nanodevice for Spatiotemporally Controlled Imaging of MicroRNA in Cells and Animals”以封面文章发表在《美国化学会志》上。

作为细胞通路的重要调控因子,microRNA是一类长约18-24个核苷酸的内源性非编码单链RNA,在肿瘤的发生和发展过程中起着关键作用。microRNA已成为一类重要的肿瘤标志物,其精准检测对于生物医学研究、疾病诊断和治疗具有重要意义。然而,目前报道的细胞内检测体系遵循“始终开启”的设计原理,一旦遇到靶标将立即进行识别和响应,从而导致低的时空分辨率和低的检测准确性。因此,开发新的分析方法和技术,在细胞和活体水平实现microRNA可控的精准检测,依然是一个挑战。

李乐乐课题组将分子信标设计与上转换发光纳米技术巧妙结合,构建了一个近红外光远程操控的智能型DNA纳米器件,实现了细胞和活体水平“时-空”可控的microRNA精准检测。该研究设计和合成了环状区修饰光敏基团的分子信标,并将其可控地装载在上转换纳米颗粒表面,构建了一个传感功能可被远程激活的医用纳米器件。该纳米器件对microRNA的的检测功能处于“关闭”状态,当到达细胞内特定位置后,在近红外光的照射下,上转换纳米颗粒局域地转换并发出高能紫外光,进而“开启”分子信标对microRNA的传感功能,有效提高了检测的精准性和时空分辨率。课题组进一步利用该纳米器件实现了小鼠肿瘤内microRNA的激活型精准成像。该工作展示了智能型纳米器件在microRNA等肿瘤标志物精准检测方面的潜力,极大地扩展了精确生物分析的工具箱,并将为肿瘤发生、发展等生物机制研究以及癌症早期诊断提供技术支持。

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    2019-04-27 zhouqu_8

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微小RNA(miRNA)是重要的翻译后调节因子。溃疡性结肠炎(UC)中升高的miR-206水平与抗炎性A3腺苷受体(A3AR)表达的抑制相关。然而,miR-206与UC患者组织学缓解的关系目前还不清楚。本研究将miR-206的表达水平与通过长期美沙拉嗪治疗的患者的组织学缓解进行研究分析,以确定该主要药物对UC的可能作用的模式。

Int Arch Allergy Immunol:在过敏性鼻炎中,MiR-202-5p能够促进M2极化

最近,有研究人员调查了MiR-202-5p对过敏性鼻炎中巨噬细胞的影响。研究包括了30名过敏性鼻炎的患者和10名健康的对照。研究人员利用鼻腔灌洗来收集鼻组织和来源于粘液的巨噬细胞,并利用流式细胞仪检测和分选了2型巨噬细胞,并且还利用qRT-PCR和蛋白免疫印迹来确定MiR-202-5p和MATN2的表达情况。研究人员还利用荧光素酶和生物素RNA-pulldown试验测试了miR-202-5p与MA