"Apollo Program" in Nanoscale: Landing and Exploring Cell-Surface with DNA Nanotechnology.

Plasma membranes are the fundamental mediators through which cells communicate with their surrounding environment. The techniques to monitor or synthetically manipulate the cell membranes are attractive tools to engineer the functions of cells as well as their local microenvironment. Current advances of biomolecular science enable the insertion of functional compounds onto cell-surface via external integration or genetic engineering to manipulate cell membrane function. Recently, the DNA nanotechnology made it possible to use synthetic DNA as an emerging and promising molecular toolkit for anchoring and exploring cell-surface. In this review, the latest advances of DNA nanotechnology on cell-surface are summarized. We first give an overview of commonly used strategies for installing DNA nanodevices onto cell-surface including amphiphilic interaction, covalent modification, and affinity labeling. Then the biological applications of DNA nanodevices on cell membranes are reviewed. By integrating functional nucleic acids as recognition elements, DNA sensors are fabricated to monitor the cellular microenvironment and membrane activities. In addition, the programmable behaviors of DNA on cell-surface are also discussed, which include biomimicry and the regulation of membrane functions. Finally, we analyze the current challenges in the development of DNA nanotechnology on cell-surface as well as their prospects in bioimaging and cancer therapy.