Viswanathan, P; Themistou, E; Ngamkham, K; Reilly, G; Armes, SP; Battaglia, G; (2014) Controlling Surface Topology and Functionality of Electrospun Fibers using Amphiphilic Block Copolymers to Direct Mesenchymal Progenitor Cell Adhesion. Biomacromolecules , 16 (1) pp. 66-75. 10.1021/bm500671j.

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Abstract

Surface patterning in three dimensions is of great importance in biomaterials design for controlling cell behavior. A facile one-step functionalization of biodegradable PDLLA fibers using amphiphilic diblock copolymers is demonstrated here, to systematically vary the fiber surface composition. The copolymers comprise a hydrophilic poly[oligo(ethylene glycol) methacrylate] (POEGMA), poly[(2-methacryloyloxy)ethyl phosphorylcholine] (PMPC) or poly[2-(dimethylamino)ethyl methacrylate)] (PDMAEMA) block and a hydrophobic poly(L-lactide) (PLA) block. The block copolymer modified fibers have increased surface hydrophilicity compared to PDLLA fibers. Mixtures of PLA-PMPC and PLA-POEGMA copolymers are utilized to exploit micro-phase separation of the incompatible hydrophilic PMPC and POEGMA blocks at the fiber surface. Conjugation of an RGD cell-adhesive peptide to one hydrophilic block (POEGMA) using thiol-ene chemistry produces fibers with domains of cell-adhesive (POEGMA) and cell-inert (PMPC) sites, mimicking the adhesive properties of the extracellular matrix (ECM). Human mesenchymal progenitor cells (hES-MPs) showed much better adhesion to the fibers with surface adhesive heterogeneity, compared to fibers with only adhesive or only inert surface chemistries.

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