Nanoplasmonic pillars engineered for single exosome detection

PloS One
Deepa RaghuMarc P Raphael

Abstract

Exosomes are secreted nanovesicles which incorporate proteins and nucleic acids, thereby enabling multifunctional pathways for intercellular communication. There is an increasing appreciation of the critical role they play in fundamental processes such as development, wound healing and disease progression, yet because of their heterogeneous molecular content and low concentrations in vivo, their detection and characterization remains a challenge. In this work we combine nano- and microfabrication techniques for the creation of nanosensing arrays tailored toward single exosome detection. Elliptically-shaped nanoplasmonic sensors are fabricated to accommodate at most one exosome and individually imaged in real time, enabling the label-free recording of digital responses in a highly multiplexed geometry. This approach results in a three orders of magnitude sensitivity improvement over previously reported real-time, multiplexed platforms. Each nanosensor is elevated atop a quartz nanopillar, minimizing unwanted nonspecific substrate binding contributions. The approach is validated with the detection of exosomes secreted by MCF7 breast adenocarcinoma cells. We demonstrate the increasingly digital and stochastic nature of the respons...Continue Reading

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Citations

Feb 20, 2020·Sensors·Jin-Ha ChoiJeong-Woo Choi
Feb 19, 2020·Expert Review of Molecular Diagnostics·Amy Makler, Waseem Asghar
Apr 25, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Alejandro PortelaLaura M Lechuga
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Feb 27, 2021·Analytical Chemistry·He YanYong Zeng
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Methods Mentioned

BETA
ELISA
surface plasmon resonance
chip
chips
AFM
Atomic Force Microscopy

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