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Discovery of Aptamer Ligands for Hepatic Stellate Cells Using SELEX
Theranostics ( IF 12.4 ) Pub Date : 2017-07-21 , DOI: 10.7150/thno.19374
Zhijin Chen 1 , Hao Liu 1 , Akshay Jain 1 , Li Zhang 1 , Chang Liu 1 , Kun Cheng 1
Affiliation  

Insulin like growth factor II receptor (IGFIIR) is a transmembrane protein overexpressed in activated hepatic stellate cells (HSCs), which are the major target for the treatment of liver fibrosis. In this study, we aim to discover an IGFIIR-specific aptamer that can be potentially used as a targeting ligand for the treatment and diagnosis of liver fibrosis. Systematic evolution of ligands by exponential enrichment (SELEX) was conducted on recombinant human IGFIIR to identify IGFIIR-specific aptamers. The binding affinity and specificity of the discovered aptamers to IGFIIR and hepatic stellate cells were studied using flow cytometry and Surface Plasmon Resonance (SPR). Aptamer-20 showed the highest affinity to recombinant human IGFIIR protein with a Kd of 35.5 nM, as determined by SPR. Aptamer-20 also has a high affinity (apparent Kd 45.12 nM) to LX-2 human hepatic stellate cells. Binding of aptamer-20 to hepatic stellate cells could be inhibited by knockdown of IGFIIR using siRNA, indicating a high specificity of the aptamer. The aptamer formed a chimera with an anti-fibrotic PCBP2 siRNA and delivered the siRNA to HSC-T6 cells to trigger silencing activity. In Vivo biodistribution study of the siRNA-aptamer chimera also demonstrated a high and specific uptake in the liver of the rats with CCl4-induced liver fibrosis. These data suggest that aptamer-20 is a high-affinity ligand for antifibrotic and diagnostic agents for liver fibrosis.

中文翻译:


使用 SELEX 发现肝星状细胞的适体配体



胰岛素样生长因子 II 受体 (IGFIIR) 是一种在活化的肝星状细胞 (HSC) 中过度表达的跨膜蛋白,是治疗肝纤维化的主要靶点。在这项研究中,我们的目标是发现一种 IGFIIR 特异性适体,它可以作为治疗和诊断肝纤维化的靶向配体。对重组人 IGFIIR 进行配体指数富集系统进化 (SELEX),以鉴定 IGFIIR 特异性适体。使用流式细胞术和表面等离子共振 (SPR) 研究了所发现的适体与 IGFIIR 和肝星状细胞的结合亲和力和特异性。通过 SPR 测定,Aaptamer-20 对重组人 IGFIIR 蛋白表现出最高的亲和力,K d为 35.5 nM。 Aptamer-20 与 LX-2 人肝星状细胞也具有高亲和力(表观 K d 45.12 nM)。使用 siRNA 敲低 IGFIIR 可以抑制 aptamer-20 与肝星状细胞的结合,表明该适体具有高度特异性。该适体与抗纤维化 PCBP2 siRNA 形成嵌合体,并将 siRNA 递送至 HSC-T6 细胞以触发沉默活性。 siRNA-适体嵌合体的体内生物分布研究也证明了CCl 4诱导的肝纤维化大鼠肝脏中的高特异性摄取。这些数据表明 aptamer-20 是抗纤维化和肝纤维化诊断剂的高亲和力配体。
更新日期:2017-12-01
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