Biosafety of a novel covered self-expandable metal stent coated with poly(2-methoxyethyl acrylate) in vivo

Tetsuya Ishizawa, Naohiko Makino, Yasuharu Kakizaki, Akiko Matsuda, Yoshihide Toyokawa, Shun Ooyama, Masaru Tanaka, Yoshiyuki Ueno

Research output: Contribution to journalArticlepeer-review

Abstract

Covered self-expandable metal stents (CSEMS) are often used for palliative endoscopic biliary drainage; however, the unobstructed period is limited because of sludge occlusion. The present study aimed to evaluate the biosafety of a novel poly(2-methoxyethyl acrylate)- coated CSEMS (PMEA-CSEMS) for sludge resistance and examine its biosafety in vivo. Using endoscopic retrograde cholangiopancreatography, we placed the PMEA-CSEMS into six normal porcine bile ducts and conventional CSEMS into three normal porcine bile ducts. We performed serological examination and undecalcified histological analysis at 1, 3, and 6 months during follow-up. In the bile ducts with PMEA-CSEMS or conventional CSEMS, we observed no increase in liver enzyme or inflammatory marker levels in the serological investigations and mild fibrosis but no inflammatory response in the histopathological analyses. Thus, we demonstrated the biosafety of PMEA-CSEMS in vivo.

Original languageEnglish
Article numbere0257828
JournalPloS one
Volume16
Issue number9 September
DOIs
Publication statusPublished - Sep 2021

All Science Journal Classification (ASJC) codes

  • General

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