A Bottom-Up Approach to Red-Emitting Molecular-Based Nanoparticles with Natural Stealth Properties and their Use for Single-Particle Tracking Deep in Brain Tissue.
Advanced Materialds. 2021-04-21; :
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Rosendale M(1), Flores J(1), Paviolo C(2), Pagano P(1), Daniel J(1), Ferreira J(3), Verlhac JB(1), Groc L(3), Cognet L(2), Blanchard-Desce M(1).
(1)Institut des Sciences Moléculaires, CNRS, Univ. Bordeaux, Bordeaux INP, UMR 5255, 351 Cours de la Libération, Talence, 33405, France.
(2)LP2N, Institut d’Optique & CNRS, Univ. Bordeaux, UMR 5298, Rue François Mitterrand, Talence, 33400, France.
(3)Interdisciplinary Institute for Neuroscience, CNRS, Univ. Bordeaux, UMR 5297, 146 Rue Léo Saignat, Bordeaux, 33076, France.
Fluorescent nanoparticles dedicated to bioimaging applications should possess specific properties that have to be maintained in the aqueous, reactive, and crowded biological environment. These include chemical and photostability, small size (on the scale of subcellular structures), biocompatibility, high brightness, and good solubility. The latter is a major challenge for inorganic nanoparticles, which require surface coating to be made water soluble. Molecular-based fluorescent organic nanoparticles (FONs) may prove a promising, spontaneously water-soluble alternative, whose bottom-up design allows for the fine-tuning of individual properties. Here, the critical challenge of controlling the interaction of nanoparticles with cellular membranes is addressed. This is a report on bright, size-tunable, red-emitting, naturally stealthy FONs that do not require the use of antifouling agents to impede interactions with cellular membranes. As a proof of concept, single FONs diffusing up to 150 µm deep in brain tissue are imaged and tracked.
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