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Polymers 2017, 9(2), 56;

A Biodegradable Microneedle Cuff for Comparison of Drug Effects through Perivascular Delivery to Balloon-Injured Arteries

Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, 50-1 Yonsei-ro, Sedaemun-gu, Seoul 03722, Korea
School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Sedaemun-gu, Seoul 03722, Korea
Authors to whom correspondence should be addressed.
Academic Editors: João F. Mano and Insung S. Choi
Received: 5 January 2017 / Revised: 25 January 2017 / Accepted: 3 February 2017 / Published: 8 February 2017
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Restenosis at a vascular anastomosis site is a major cause of graft failure and is difficult to prevent by conventional treatment. Perivascular drug delivery has advantages as drugs can be diffused to tunica media and subintima while minimizing the direct effect on endothelium. This in vivo study investigated the comparative effectiveness of paclitaxel, sirolimus, and sunitinib using a perivascular biodegradable microneedle cuff. A total of 31 New Zealand white rabbits were used. Rhodamine was used to visualize drug distribution (n = 3). Sirolimus- (n = 7), sunitinib- (n = 7), and paclitaxel-loaded (n = 7) microneedle cuffs were placed at balloon-injured abdominal aortae and compared to drug-free cuffs (n = 7). Basic histological structures were not affected by microneedle devices, and vascular wall thickness of the device-only group was similar to that of normal artery. Quantitative analysis revealed significantly decreased neointima formation in all drug-treated groups (p < 0.001). However, the tunica media layer of the paclitaxel-treated group was significantly thinner than that of other groups and also showed the highest apoptotic ratio (p < 0.001). Proliferating cell nuclear antigen (PCNA)-positive cells were significantly reduced in all drug-treated groups. Sirolimus or sunitinib appeared to be more appropriate for microneedle devices capable of slow drug release because vascular wall thickness was minimally affected. View Full-Text
Keywords: anastomosis; drug delivery; microneedle; restenosis; peripheral vascular disease anastomosis; drug delivery; microneedle; restenosis; peripheral vascular disease

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Kim, D.-H.; Jang, E.H.; Lee, K.J.; Lee, J.Y.; Park, S.H.; Seo, I.H.; Lee, K.W.; Lee, S.H.; Ryu, W.; Youn, Y.-N. A Biodegradable Microneedle Cuff for Comparison of Drug Effects through Perivascular Delivery to Balloon-Injured Arteries. Polymers 2017, 9, 56.

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