Abstract
Electrospun fibrous scaffolds combined with bioactive factors can display impressive performance as an ideal wound dressing, since they can mimic the composition and physicochemical properties of the extracellular matrix (ECM). The aim of this study was to fabricate a new composite biomaterial (IGF1-DA and Os-DA-modified PLGA electrospun fibrous scaffold) for wound healing, using a rat model for experimental evaluation. A small pentapeptide tag composed of DA–Lys–DA–Lys–DA residues was introduced into insulin-like growth factor 1 (IGF1) and the antimicrobial peptide Os to prepare IGF1 and Os modified with 3,4-dihydroxyphenylalanine (DA) (IGF1-DA and Os-DA). The designed chimeric growth factor and antimicrobial peptide could successfully anchor to PLGA electrospun fibrous scaffolds, and the growth factor and antimicrobial peptide could be controllably released from the electrospun fibrous scaffolds. The results showed that the IGF1-DA and Os-DA-modified PLGA electrospun fibrous scaffolds (PLGA/Os-DA/IGF1-DA) exhibited high hydrophilicity and antimicrobial activity; moreover, the porous network of the scaffolds was similar to that of the natural ECM, which can provide a favourable environment for BALB/C 3T3 cells growth. The in vivo application of PLGA/Os-DA/IGF1-DA electrospun fibrous scaffolds in rat skin wounds resulted in improved wound recovery and tissue regeneration rate. The experimental results indicated that the IGF1-DA and Os-DA could effectively bind to PLGA electrospun fibrous scaffolds, promote wound healing and prevent infection in rats, thereby suggesting that PLGA/Os-DA/IGF1-DA electrospun fibrous scaffolds have a wide application value in the field of skin wound repair.
Highlights
Electrospun fibrous scaffolds combined with bioactive factors can display impressive performance as an ideal wound dressing, since they can mimic the composition and physicochemical properties of the extracellular matrix (ECM)
The repeat sequence Tyr–Lys–Tyr–Lys–Tyr containing tyrosine was added to the end of the growth factor via recombinant gene technology, and tyrosine was transformed into a DA molecule through in vitro hydroxylation
The bioactive factors insulin-like growth factor 1 (IGF1)-DA and Os-DA could more effectively bind to poly lactic-co-glycolic acid (PLGA) scaffold and improve its therapeutic efficiency
Summary
Electrospun fibrous scaffolds combined with bioactive factors can display impressive performance as an ideal wound dressing, since they can mimic the composition and physicochemical properties of the extracellular matrix (ECM). The aim of this study was to fabricate a new composite biomaterial (IGF1-DA and Os-DA-modified PLGA electrospun fibrous scaffold) for wound healing, using a rat model for experimental evaluation. To functionalise the electrospun fibrous scaffold for the promotion of skin wound healing, it can be loaded with several bioactive factors, such as proteins, peptides and small-molecule drugs[7,8,9]. Electrospun fibrous scaffolds have remarkable advantages in both ECM-biomimetic structures and the ability to adsorb bioactive factors and have emerged as essential applications in the field of skin wound repair. We speculate that DA-modified growth factors and AMP can effectively bind on the electrospun fibrous scaffold and promote skin wound healing. We investigated the wound healing ability of the PLGA/Os-DA/IGF1-DA electrospun fibrous scaffolds in a full-thickness wound model
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