Single-cell mechanogenetics using monovalent magnetoplasmonic nanoparticles.
Single-cell mechanogenetics using monovalent magnetoplasmonic nanoparticles.
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DOI:
10.1038/nprot.2017.071
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发表时间:
2017-09
期刊:
影响因子:
14.8
通讯作者:
Cheon J
中科院分区:
文献类型:
--
作者:
Kim JW;Seo D;Lee JU;Southard KM;Lim Y;Kim D;Gartner ZJ;Jun YW;Cheon J
Spatiotemporal interrogation of signal transduction at the single cell level is necessary to answer a host of important biological questions. This protocol describes a nanotechnology-based single-cell and single-molecule perturbation tool, termed mechanogenetics, that enables precise spatial and mechanical control over genetically encoded cell-surface receptors in live cells. The key components of this tool are a magnetoplasmonic nanoparticle (MPN) actuator that delivers defined spatial and mechanical cues to receptors through target-specific one-to-one engagement, and a micromagnetic tweezers (µMT) that remotely controls the magnitude of force exerted on a single MPN. This protocol consists of three major parts: 1) Preparation of small (40–50 nm), monovalent, and modular MPN probes, including chemical synthesis of MPN nanoparticles, conjugation with DNA, and purification of monovalent MPNs, 2) µMT setup and single particle force calibration as a function of µMT-to-MPN distance, and 3) control of spatial and mechanical properties of targeted mechanosensitive receptors in live cells by adjusting the µMT-to-MPN distance. Using benzylguanine-functionalized MPNs and model cell lines expressing either SNAP-tagged Notch or vascular endothelial cadherin (VE-cadherin), we provide stepwise instructions for mechanogenetic control of receptor clustering or mechanical activation. The ability of this method to differentially control spatial and mechanical inputs to targeted receptors makes it particularly useful for interrogating the differential contributions of each individual cue on cell signaling. The entire procedure takes up to 1 week. This tool has versatile applications spanning the basic to applied biological sciences.
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影响因子:
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38.3
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