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• W2554585481 abstract "Surface bound guidance cues and gradients are vital for directing cellular processes during development and repair. In vivo, these cues are often presented within a soft extracellular matrix with elastic moduli E < 10 kPa, but in vitro haptotaxis experiments have been conducted primarily on hard substrates with elastic moduli in the MPa to GPa range. Here, a technique is presented for patterning haptotactic proteins with nanometer resolution on soft substrates with physiological elasticity. A new nanocontact printing process was developed that circumvented the use of plasma activation that was found to alter the mechanical properties of the substrate. A dissolvable poly(vinyl alcohol) film was first patterned by lift-off nanocontact printing, and in turn printed onto the soft substrate, followed by dissolution of the film in water. An array of 100 unique digital nanodot gradients (DNGs), consisting of millions of 200 × 200 nm2 protein nanodots, was patterned in less than 5 min with with <5% average deviation from the original gradient design. DNGs of netrin-1, a known protein guidance cue, were patterned, and the unpatterned surface was backfilled with a reference surface consisting of 75% polyethylene glycol grafted with polylysine and 25% poly-d-lysine. Haptotaxis of C2C12 myoblasts demonstrated the functionality of the DNGs patterned on soft substrates. In addition, high densities of netrin-1 were observed to induce cell spreading, while live imaging of sinusoidal control gradients highlighted cell migration and navigation by “inching”. The nanopatterning technique developed here paves the way for studying haptotactic responses to diverse digital nanodot patterns on surfaces covering the full range of physiological elasticity, and is expected to be applicable to the study of both culture and primary cells, such as neutrophils and neurons." @default.
• W2554585481 created "2016-11-30" @default.
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• W2554585481 date "2016-12-08" @default.
• W2554585481 modified "2023-09-26" @default.
• W2554585481 title "Nanocontact Printing of Proteins on Physiologically Soft Substrates to Study Cell Haptotaxis" @default.
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• W2554585481 doi "https://doi.org/10.1021/acs.langmuir.6b03246" @default.
• W2554585481 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27993028" @default.
• W2554585481 hasPublicationYear "2016" @default.
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