Programmable multivalent display of receptor ligands using peptide nucleic acid nanoscaffolds.

Programmable multivalent display of receptor ligands using peptide nucleic acid nanoscaffolds.
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DOI:
10.1038/ncomms1629
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发表时间:
2012-01-10
影响因子:
16.6
通讯作者:
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中科院分区:
综合性期刊1区
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多价效应决定了一个分子实体上的多个配体与受体的结合亲和力。整合素是通过与细胞外基质内的肽序列多价结合来介导细胞附着的受体,并且过表达促进某些癌症的转移。整联蛋白拮抗剂的多价展示增强了它们的功效,但是目前的支架对于配体的展示具有有限的范围和精度。在这里,我们提出了一种方法来研究多价效应在广泛的配体数量,密度和三维排列。使用L-赖氨酸γ-取代的肽核酸,在1至45个配体的范围内检查整联蛋白拮抗剂的多价作用。在体外和体内模型中,最佳构建体将拮抗剂对黑素瘤细胞与细胞外基质结合的抑制活性提高了两个数量级。
Multivalent effects dictate the binding affinity of multiple ligands on one molecular entity to receptors. Integrins are receptors that mediate cell attachment through multivalent binding to peptide sequences within the extracellular matrix, and overexpression promotes the metastasis of some cancers. Multivalent display of integrin antagonists enhances their efficacy, but current scaffolds have limited ranges and precision for the display of ligands. Here we present an approach to study multivalent effects across wide ranges of ligand number, density, and three-dimensional arrangement. Using L-lysine γ-substituted peptide nucleic acids, the multivalent effects of an integrin antagonist were examined over a range of 1 to 45 ligands. The optimal construct improves the inhibitory activity of the antagonist by two orders of magnitude against the binding of melanoma cells to the extracellular matrix in both in vitro and in vivo models.
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