Highly flexible and porous silk fibroin microneedle wraps for perivascular drug delivery

Ji Yong Lee, Eui Hwa Jang, Jae Ho Kim, Seung Hyun Park, Yosup Kang, Sanghyun Park, Kang Ju Lee, Jung Hwan Kim, Young Nam Youn, Won Hyoung Ryu

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Various perivascular drug delivery techniques have been demonstrated for localized post-treatment of intimal hyperplasia: a vascular inflammatory response caused by endothelial damages. Although most perivascular devices have focused on controlling the delivery duration of anti-proliferation drug, the confined and unidirectional delivery of the drug to the target tissue has become increasingly important. In addition, careful attention should also be paid to the luminal stability and the adequate exchange of vascular protein or cell between the blood vessel and extravascular tissue to avoid any side effect from the long-term application of any perivascular device. Here, a highly flexible and porous silk fibroin microneedle wrap (Silk MN wrap) is proposed to directly inject antiproliferative drug to the anastomosis sites while ensuring sufficient vascular exchanges. Drug-embedded silk MNs were transfer-molded on a highly flexible and porous silk wrap. The enhanced cell compatibility, molecular permeability, and flexibility of silk MN wrap guaranteed the structural integrity of blood vessels. Silk wrap successfully supported the silk MNs and induced multiple MN penetration to the target tissue. Over 28 days, silk MN wrap significantly inhibited intimal hyperplasia with a 62.1% reduction in neointimal formation.

Original languageEnglish
Pages (from-to)125-135
Number of pages11
JournalJournal of Controlled Release
Publication statusPublished - 2021 Dec 10

Bibliographical note

Funding Information:
This research was supported by a grant of Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare , South Korea (grant number: HI18C1237 ). The authors specially appreciate Chohee Park and Gwijae Kim for conducting in vitro cytotoxicity study.

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Pharmaceutical Science


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