Decreased material-activation of the complement system using low-energy plasma polymerized poly(vinyl pyrrolidone) coatings

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Title: Decreased material-activation of the complement system using low-energy plasma polymerized poly(vinyl pyrrolidone) coatings
Author(s): Andersen, Thomas E.; Palarasah, Yaseelan; Skjodt, Mikkel-Ole; Ogaki, Ryosuke; Benter, Maike; Alei, Mojagan; Kolmos, Hans J.; Koch, Claus; Kingshott, Peter
Abstract: In the current study we investigate the activation of blood complement on medical device silicone rubber and present a plasma polymerized vinyl pyrrolidone (ppVP) coating which strongly decreases surface-activation of the blood complement system. We show that uncoated silicone and polystyrene are both potent activators of the complement system, measured both as activated, deposited C3b and quantifying fluid-phase release of the cleavage fragment C3c. The ppVP coated silicone exhibits approximately 90% reduced complement activation compared to untreated silicone. Quartz crystal microbalance with dissipation (QCM-D) measurements show relatively strong adsorption of blood proteins including native C3 to the ppVP surface, indicating that reduction of complement activation on ppVP is neither a result of low protein adsorption nor lower direct C3-binding, and is therefore possibly a consequence of differences in the adsorbed protein layer composition. The alternative and classical complement pathways are barely detectable on ppVP while the lectin pathway through MBL/ficolin-2 deposition remains active on ppVP suggesting this pathway is responsible for the remaining subtle activation on the ppVP coated surface. The ppVP surface is furthermore characterized physically and chemically using scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR), which indicates preservation of chemical functionality by the applied plasma process. Overall, the ppVP coating shows a potential for increasing complement compatibility of blood-contacting devices.
Publication type: Journal article
Source: Biomaterials, Vol. 32, no. 20 (Jul 2011), pp. 4481-4488
Publication year: 2011
FOR Code(s): 0903 Biomedical Engineering; 0904 Chemical Engineering; 0912 Materials Engineering
Keyword(s): Complement activation; Plasma polymerization; Protein adsorption; Silicone; Vinyl pyrrolidone
Publisher: Elsevier
ISSN: 0142-9612
Publisher URL: http://dx.doi.org/10.1016/j.biomaterials.2011.03.002
Peer reviewed