Programming DNA Aptamer Arrays of Prescribed Spatial Features with Enhanced Bioavailability and Cell Growth Modulation.

Abstract

Epithelial cell adhesion molecules (EpCAMs) play pivotal roles in tumorigenesis in many cancer types, which is reported to reside within nano- to microscale membrane domains, forming small clusters. We propose that building multivalent ligands that spatially patch to EpCAM clusters may largely enhance their targeting capability. Herein, we assembled EpCAM aptamers into nanoscale arrays of prescribed valency and spatial arrangements by using a rectangular DNA pegboard. Our results revealed that EpCAM aptamer arrays exhibited significantly higher binding avidity to MCF-7 cells than free monovalent aptamers, which was affected by both valency and spatial arrangement of aptamers. Furthermore, EpCAM aptamer arrays showed improved tolerance against competing targets in an extracellular environment and potent bioavailability and targeting specificity in a xenograft tumor model in mice. This work may shed light on rationally designing multivalent ligand complexes of defined parameters with optimized binding avidity and targeting capability toward various applications in the biomedical fields.

• Authors: Fan Xu, Qing Xia, Jing Ye, Liang Dong, Donglei Yang, Wei Xue, Pengfei Wang
• Journal: Nano letters (Nano Lett) Vol. 22 Issue 24 Pg. 9935-9942 (12 28 2022) ISSN: 1530-6992 [Electronic] United States
• PMID: 36480429 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Epithelial Cell Adhesion Molecule
• Aptamers, Nucleotide

Topics

• Humans
• Animals
• Mice
• Epithelial Cell Adhesion Molecule
• Aptamers, Nucleotide (chemistry)
• Cell Line, Tumor
• Biological Availability
• MCF-7 Cells
• Disease Models, Animal