Evaluation of the effect of expansion and shear stress on a self-assembled endothelium mimicking nanomatrix coating for drug eluting stents in vitro and in vivo

• Type of Material: Article
• Authors: Adinarayana Andukuri, University of Alabama Birmingham; IlJae Min, Korea Institute of Science and Technology; Patrick Hwang, University of Alabama Birmingham; Grant Alexander, University of Alabama Birmingham; Lauren E. Marshall, University of Alabama Birmingham; Joel L. Berry, University of Alabama Birmingham; Timothy M. Wick, University of Alabama Birmingham; Yoon Ki Joung, Korea Institute of Science and Technology; Young-sup Yoon, Emory University; Brigitta C. Brott, University of Alabama Birmingham; Dong Keun Han, Korea Institute of Science and Technology; Ho-Wook Jun, University of Alabama Birmingham
• Language: English
• Date: 2014-09-01
• Publisher: IOP Publishing: Hybrid Open Access
• Publication Version: Author Accepted Manuscript (After Peer Review)
• Copyright Statement: © 2014 IOP Publishing Ltd Printed in the UK.
• License: Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International
• Final Published Version (URL): http://dx.doi.org/10.1088/1758-5082/6/3/035019
• Title of Journal or Parent Work: Biofabrication
• ISSN: 1758-5082
• Volume: 6
• Issue: 3
• Start Page: 035019
• End Page: 035019
• Grant/Funding Information: It was also supported by the Cell Regeneration Program (2012M3A9C6049717) through the Korea NSF funded by the MSIP, Industrial Strategic Technology Development Program (10043971) funded by the MOTIE, and KIST Program (2E24680) funded by MSIP, Korea for DKH.; This study was supported by NIH (1R03EB017344-01) for HWJ, NIH (1DP3DK094346-01) for HWJ and YY, and AHA predoctoral fellowship for AA.
• Keywords: Materials Science, Biomaterials; Science & Technology; IMPLANTS; Technology; SURFACES; Engineering; stent; endothelium; Engineering, Biomedical; PEPTIDE-AMPHIPHILE NANOFIBERS; CELL-ADHESION; POLYMER; Materials Science; nanomatrix
• Research Categories: Engineering, Biomedical

Abstract

Coating stability is increasingly recognized as a concern impacting the long-term effectiveness of drug eluting stents (DES). In particular, unstable coatings have been brought into focus by a recently published report (Denardo et al 2012 J. Am. Med. Assoc. 307 2148-50). Towards the goal of overcoming current challenges of DES performance, we have developed an endothelium mimicking nanomatrix coating composed of peptide amphiphiles that promote endothelialization, but limit smooth muscle cell proliferation and platelet adhesion. Here, we report a novel water evaporation based method to uniformly coat the endothelium mimicking nanomatrix onto stents using a rotational coating technique, thereby eliminating residual chemicals and organic solvents, and allowing easy application to even bioabsorbable stents. Furthermore, the stability of the endothelium mimicking nanomatrix was analyzed after force experienced during expansion and shear stress under simulated physiological conditions. Results demonstrate uniformity and structural integrity of the nanomatrix coating. Preliminary animal studies in a rabbit model showed no flaking or peeling, and limited neointimal formation or restenosis. Therefore, it has the potential to improve the clinical performance of DES by providing multifunctional endothelium mimicking characteristics with structural integrity on stent surfaces.