Green Tea Catechin-grafted Silk Fibroin Hydrogels with Reactive Oxygen Species Scavenging Activity for Wound Healing Applications

Overview

Journal Biomater Res

Specialty Biomedical Engineering

Date 2022 Nov 10

PMID 36352485

Authors

Gyeongwoo Lee

Young-Gwang Ko

Ki Hyun Bae

Motoichi Kurisawa

Oh Kyoung Kwon

Oh Hyeong Kwon

Affiliations

Soon will be listed here.

Abstract

Background: Overproduction of reactive oxygen species (ROS) is known to delay wound healing by causing oxidative tissue damage and inflammation. The green tea catechin, (-)-Epigallocatechin-3-O-gallate (EGCG), has drawn a great deal of interest due to its strong ROS scavenging and anti-inflammatory activities. In this study, we developed EGCG-grafted silk fibroin hydrogels as a potential wound dressing material.

Methods: The introduction of EGCG to water-soluble silk fibroin (SF-WS) was accomplished by the nucleophilic addition reaction between lysine residues in silk proteins and EGCG quinone at mild basic pH. The resulting SF-EGCG conjugate was co-crosslinked with tyramine-substituted SF (SF-T) via horseradish peroxidase (HRP)/HO mediated enzymatic reaction to form SF-T/SF-EGCG hydrogels with series of composition ratios.

Results: Interestingly, SF-T70/SF-EGCG30 hydrogels exhibited rapid in situ gelation (< 30 s), similar storage modulus to human skin (≈ 1000 Pa) and superior wound healing performance over SF-T hydrogels and a commercial DuoDERM® gel dressings in a rat model of full thickness skin defect.

Conclusion: This study will provide useful insights into a rational design of ROS scavenging biomaterials for wound healing applications.

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