Selection and Characterization of an α6β4 Integrin blocking DNA Aptamer.

Selection and Characterization of an α6β4 Integrin blocking DNA Aptamer.
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DOI:
10.1038/mtna.2016.10
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发表时间:
2016-03-15
期刊:
Molecular therapy. Nucleic acids
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异源二聚体层粘连蛋白受体α6β4整合素在促进肿瘤细胞生长、侵袭和向器官转移中起核心作用。由于整联蛋白的过度产生通常与不良预后有关,因此抑制整联蛋白α6β4与层粘连蛋白的结合具有高度的治疗意义。在这里,我们报告了通过指数富集的配体的细胞系统进化和基于珠的选择的组合,导致第一个适体抑制α6β4整联蛋白和层粘连蛋白-332之间的相互作用。这种整合素α6β4特异性DNA适体(IDA)可抑制前列腺癌细胞(PC-3)与层粘连蛋白-332的粘附,IC 50值为149 nmol/l。关于适体与PC-3细胞相互作用的Kd值为137 nmol/l。进一步表征显示对α6整联蛋白具有特异性,在小鼠血浆中的半衰期为6小时。两种截短形式的适体保留了它们的结合能力,但失去了抑制层粘连蛋白-332和PC-3细胞之间相互作用的能力。共聚焦激光扫描显微镜研究表明,适体被内化到PC-3-细胞。因此,除了这种适体的粘附阻断功能之外,IDA还可以用于将siRNA、microRNA或毒素递送至呈递整合素α6β4的癌细胞。
The heterodimeric laminin receptor α6β4 integrin plays a central role in the promotion of tumor cell growth, invasion, and organotropic metastasis. As an overproduction of the integrin is often linked to a poor prognosis, the inhibition of integrin α6β4 binding to laminin is of high therapeutical interest. Here, we report on the combination of a cell-systematic evolution of ligands by exponential enrichment and a bead-based selection resulting in the first aptamer inhibiting the interaction between α6β4 integrin and laminin-332. This Integrin α6β4-specific DNA Aptamer (IDA) inhibits the adhesion of prostate cancer cells (PC-3) to laminin-332 with an IC50 value of 149 nmol/l. The Kd value concerning the aptamer's interaction with PC-3 cells amounts to 137 nmol/l. Further characterization showed specificity to α6 integrins and a half-life in murine blood plasma of 6 hours. Two truncated versions of the aptamer retained their binding capacity, but lost their ability to inhibit the interaction between laminin-332 and PC-3 cells. Confocal laser scanning microscope studies revealed that the aptamer was internalized into PC-3-cells. Therefore, in addition to the adhesion-blocking function of this aptamer, IDA could also be applied for the delivery of siRNA, microRNA or toxins to cancer cells presenting the integrin α6β4.
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