Delivery of chemo-sensitizing siRNAs to HER2+-breast cancer cells using RNA aptamers.

Delivery of chemo-sensitizing siRNAs to HER2+-breast cancer cells using RNA aptamers.
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DOI:
10.1093/nar/gks294
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发表时间:
2012-07
影响因子:
14.9
通讯作者:
Giangrande PH
Giangrande PH
中科院分区:
生物学2区
文献类型:
--
作者:
Thiel KW;Hernandez LI;Dassie JP;Thiel WH;Liu X;Stockdale KR;Rothman AM;Hernandez FJ;McNamara JO 2nd;Giangrande PH

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人表皮生长因子受体2(HER 2)在乳腺癌中的表达与侵袭性表型和预后不良相关,使其成为一个有吸引力的治疗靶点。曲妥珠单抗是一种基于HER 2抗体的抑制剂,目前是HER 2+乳腺癌的主要靶向治疗药物。不幸的是,许多患者不可避免地对治疗产生耐药性,这突出了对替代靶向治疗选择的需求。在这项研究中,我们使用了一种新的,基于细胞的选择方法,用于分离“细胞类型特异性”,“细胞内化RNA配体(适体)”,能够提供治疗性小干扰RNA(siRNA)的HER 2表达乳腺癌细胞。具有最大特异性和内化潜力的RNA适体与靶向抗凋亡基因Bcl-2的siRNA共价连接。我们证明,当应用于细胞时,HER 2适体-Bcl-2 siRNA缀合物选择性地内化到HER 2+细胞中并沉默Bcl-2基因表达。重要的是,Bcl-2沉默使这些细胞对化疗(顺铂)敏感,这表明了治疗HER 2+状态乳腺癌的潜在新治疗方法。总之,我们描述了一种新的基于细胞的选择方法,该方法能够鉴定用于将治疗性siRNA靶向表达HER 2的乳腺癌细胞的细胞内化RNA适体。这项技术的未来改进可能会促进基于RNA的试剂在靶向治疗应用中的广泛使用。
Human epidermal growth factor receptor 2 (HER2) expression in breast cancer is associated with an aggressive phenotype and poor prognosis, making it an appealing therapeutic target. Trastuzumab, an HER2 antibody-based inhibitor, is currently the leading targeted treatment for HER2+-breast cancers. Unfortunately, many patients inevitably develop resistance to the therapy, highlighting the need for alternative targeted therapeutic options. In this study, we used a novel, cell-based selection approach for isolating ‘cell-type specific’, ‘cell-internalizing RNA ligands (aptamers)’ capable of delivering therapeutic small interfering RNAs (siRNAs) to HER2-expressing breast cancer cells. RNA aptamers with the greatest specificity and internalization potential were covalently linked to siRNAs targeting the anti-apoptotic gene, Bcl-2. We demonstrate that, when applied to cells, the HER2 aptamer-Bcl-2 siRNA conjugates selectively internalize into HER2+-cells and silence Bcl-2 gene expression. Importantly, Bcl-2 silencing sensitizes these cells to chemotherapy (cisplatin) suggesting a potential new therapeutic approach for treating breast cancers with HER2+-status. In summary, we describe a novel cell-based selection methodology that enables the identification of cell-internalizing RNA aptamers for targeting therapeutic siRNAs to HER2-expressing breast cancer cells. The future refinement of this technology may promote the widespread use of RNA-based reagents for targeted therapeutic applications.
DOI: 10.1038/nbt.1560
发表时间: 2009-09
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