Modulation of Foreign Body Reaction Against PDMS Implant by Grafting Topographically Different Poly(Acrylic Acid) Micropatterns
39 Pages Posted: 8 Apr 2019
Date Written: April 8, 2019
The surface of poly(dimethylsiloxane) (PDMS) was grafted with poly(acrylic acid) (PAA) layers via surface-initiated photopolymerization to suppress the capsular contracture resulting from a foreign body reaction. Owing to the nature of photo-induced polymerization, various PAA micropatterns could be fabricated using photolithography. Hole and stripe micropatterns approximately 100-μm wide and 3-μm thick were grafted onto the PDMS surface without delamination. The incorporation of PAA micropatterns provided not only chemical cues by hydrophilic PAA microdomains but also topographical cues by hole or stripe micropatterns. In vitro studies revealed that a PAA-grafted PDMS surface had a lower proliferation of both macrophages and fibroblasts regardless of the pattern presence. However, PDMS with PAA micropatterns, especially stripe micropatterns, minimized the aggregation of fibroblasts and their subsequent differentiation into myofibroblasts. An in vivo study also showed that PDMS samples with stripe micropatterns polarized macrophages into anti-inflammatory M2 macrophages and most effectively inhibited capsular contracture, which was demonstrated by investigating the inflammation score, transforming-growth-factor-β expression, number of macrophages, and myofibroblasts as well as the collagen density and capsule thickness.
Keywords: Capsular contracture, Foreign body reaction, Photo-induced grafting, Poly(acrylic acid) layer, Micropatterns
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