Cellular response to nanoscale elastin-like polypeptide polyelectrolyte multilayers

Acta Biomaterialia
M SwierczewskaPadmavathy Rajagopalan

Abstract

Ionic elastin-like polypeptide (ELP) conjugates are a new class of biocompatible, self-assembling biomaterials. ELPs composed of the repeat unit (GVGVP)(n) are derived from the primary sequence of mammalian elastin and produced in Escherichia coli. These biopolymers exhibit an inverse transition temperature that renders them extremely useful for applications in cell-sheet engineering. Cationic and anionic conjugates were synthesized by the chemical coupling of ELP to polyethyleneimine (PEI) and polyacrylic acid (PAA). The self-assembly of ELP-PEI and ELP-PAA using the layer-by-layer deposition of alternately charged polyelectrolytes is a simple, versatile technique to generate bioactive and biomimetic surfaces with the ability to modulate cell-substratum interactions. Our studies are focused on cellular response to self-assembled multilayers of ionic (GVGVP)(40) incorporated within the polymeric sequence H(2)N-MVSACRGPG-(GVGVP)(40)-WP-COOH. Angle-dependent XPS studies indicated a difference in the chemical composition at the surface ( approximately 10A below the surface) and subsurface regions. These studies provided additional insight into the growth of the nanoscale multilayer assembly as well as the chemical environment that...Continue Reading

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