Lubricated biodegradable polymer networks for regulating nerve cell behavior and fabricating nerve conduits with a compositional gradient

Biomacromolecules (Impact Factor: 5.75). 02/2012;


We present a method of tuning surface chemistry and nerve cell behavior by photo-cross-linking methoxy poly(ethylene glycol) monoacrylate (mPEGA) with hydrophobic, semicrystalline poly(ε-caprolactone) diacrylate (PCLDA) at various weight compositions of mPEGA (ø(m)) from 2 to 30%. Improved surface wettability is achieved with corresponding decreases in friction, water contact angle, and capability of adsorbing proteins from cell culture media because of repulsive PEG chains tethered in the network. The responses of rat Schwann cell precursor line (SpL201), rat pheochromocytoma (PC12), and E14 mouse neural progenitor cells (NPCs) to the modified surfaces are evaluated. Nonmonotonic or parabolic dependence of cell attachment, spreading, proliferation, and differentiation on ø(m) is identified for these cell types with maximal values at ø(m) of 5-7%. In addition, NPCs demonstrate enhanced neuronal differentiated lineages on the mPEGA/PCLDA network at ø(m) of 5% with intermediate wettability and surface energy. This approach lays the foundation for fabricating heterogeneous nerve conduits with a compositional gradient along the wall thickness, which are able to promote nerve cell functions within the conduit while inhibiting cell attachment on the outer wall to prevent potential fibrous tissue formation following implantation.

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    • "When grafted from surface in a high density, poly(acrylamide) can form a physically cross-linked structure without cross-linking agents. This grafting layer is able to achieve high protein retention ability without unfavorable cell adhesion, since cell repellence is a common property for long or high-density hydrophilic polymer chains[19] [20]. To the best of our knowledge, protein retention promoted PAAm brushes was only grown on styrene-b-(ethylene-co-butylene)-b-styrene elastomer (SEBS) surface by micropatterning grafting[15] [21], and there was no such study on PCL substrate . "

    Applied Surface Science 11/2015; DOI:10.1016/j.apsusc.2015.11.004 · 2.71 Impact Factor