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Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation

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Manipulation of cell adhesion and dynamics using RGD functionalized polymers.

Juyi Li¹, Yingjie Yu, Kim Myungwoong

¹Department of Materials Science & Chemical Engineering, Stony Brook University, Stony Brook, NY 11794, USA. nklijuyi@gmail.com miriam.rafailovich@stonybrook.edu.

Journal of Materials Chemistry. B

|April 9, 2020

Summary

Researchers created a smart polymer that changes shape with an electric field, revealing specific peptide sequences. This biomimetic material guides cell attachment and migration, mimicking natural tissue design for engineered constructs.

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Area of Science:

Biomaterials Science
Polymer Chemistry
Tissue Engineering

Background:

Developing smart biomaterials is crucial for mimicking natural tissue environments.
Controlled presentation of cell-adhesive motifs is key for tissue regeneration.

Purpose of the Study:

To synthesize and characterize a stimuli-responsive ABA triblock copolymer.
To investigate the selective revelation of peptide sequences within the polymer.
To evaluate the impact of patterned substrates on cell behavior.

Main Methods:

Synthesis of poly(methacrylic acid)-block-poly(2-hydroxyethyl methacrylate)-block-poly(methacrylic acid) triblock copolymers.
Thiol-acrylate Michael addition for peptide sequence insertion (RDG or RGD).
Atomic force microscopy and electric field application for pattern analysis.
Cell culture studies including attachment and migration assays (agarose droplet method).

Main Results:

Successfully synthesized ABA triblock copolymers with tunable molecular weights.
Demonstrated electric-field-induced stretching of imprinted copolymer gratings by a factor of five.
Observed selective cell attachment and migration on RGD-functionalized, field-aligned patterns.
Minimal cell adhesion and migration on non-functionalized or RDG-only substrates.

Conclusions:

A smart, biomimetic polymer substrate was successfully constructed.
Selective revelation of functional domains (RGD peptides) is achievable using external electric fields.
The developed material shows potential for guiding cell behavior in engineered tissue constructs.