Effect of Electrospun Non-Woven Mats of Dibutyryl Chitin/Poly(Lactic Acid) Blends on Wound Healing in Hairless Mice

Seon Il Jang,Duckhee Lee,Kwang-Hyun Park,Hee Min Hwang,Thuy Thi Thu Nguyen,Mi-Sun Song,Ji Ye Mok,In Hwa Jeon,Kyu Yun Chai,Jun Seo Park

doi:10.3390/molecules17032992

Abstract

The aim of this study was to examine the proliferative ability of dibutyryl chitin (DBC) on scratch wounds in HaCaT keratinocytes and to evaluate the effect of nanoporous non-woven mat (DBCNFM) on skin wound healing in hairless mice using the advantages of DBCNFM, such as high porosity and high surface area to volume. The cell spreading activity of DBC was verified through a cell spreading assay in scratched human HaCaT keratinocytes. Scratch wound experiments showed that DBC notably accelerates the spreading rate of HaCaT keratinocytes in a dose dependent manner. The molecular aspects of the healing process were also investigated by hematoxylin & eosin staining of the healed skin, displaying the degrees of reepithelialization and immunostaining on extracellular matrix synthesis and remodeling of the skin. Topical application of DBCNFM significantly reduced skin wound rank scores and increased the skin remodeling of the wounded hairless mice in a dose dependent way. Furthermore, DBCNFM notably increased the expression of the type 1 collagen and filaggrin. These results demonstrate that DBC efficiently accelerates the proliferation of HaCaT keratinocytes and DBCNFM notably increases extracellular matrix synthesis on remodeling of the skin, and these materials are a good candidate for further evaluation as an effective wound healing agent.

Highlights

Skin is the largest organ of the integumentary system in the body and normally separates and protects the internal structures from the external environment
We examined the proliferative ability off the non-woven mat of dibutyryl chitin (DBC) on scratch wounds in HaCaT keratinocyte s and the effect of DBCNFM on skin wound healing in hairless mice
We found that DBC notably accelerates the spreading rate and collagen type 1 synthesis of HaCaT keratinocytes and topical application of DBCNFM significantly increases the skin remodeling in hairless mice

Summary

Introduction

Skin is the largest organ of the integumentary system in the body and normally separates and protects the internal structures from the external environment. The structure of skin is composed of three layers such as epidermis, dermis and hypodermis. The outer skin, the epidermis, is a tightly bound, stratified, and squamous epithelium, covered by keratin [1,2,3]. Barrier function of human skin largely depends on the final product of epidermal cell differentiation, the horny layer, i.e., stratum corneum [2,3]. The middle layer is called the dermis, which is composed of connective tissue, blood vessels, nerve endings, hair follicles, and sweat and oil glands. Nanofibrous matrices have applications such as tissue engineering, drug delivery, and wound dressing due to their large surface area to volume ratio, high porosity, and small pore size [5]

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