Freeze-dried dressing based on recombinant human-like collagen and EGF
enhanced cutaneous wound healing in rats
Abstract
Wound healing is a complex biological dynamic process that involves the
transfer of multiple growth factors (GF) from the extracellular matrix
(ECM) to fibroblasts for migration, proliferation, and wound closure.
Among them, epidermal growth factor (EGF) as the most representative GF
has been studied in deeply. Collagen is the most abundant ECM structural
protein and has been widely used in tissue engineering for skin repair
and skin remodeling. A recombinant human-like collagen (RHC) has been
constructed to substitute nature collagen to improve its solubility and
immunogenicity. We combined RHC and EGF to obtain a freeze-dried
dressing to mimic the function of ECM for skin repair. A synergy
occurred when combined EGF and RHC, that was significantly promoted the
proliferation, adhesion and extension of fibroblasts (NIH/3T3) and
migration of keratinocytes (HaCaT). RHC/EGF freeze-dried dressing was a
loose and porous cake and redissolved quickly. RHC/EGF freeze-dried
dressings significantly accelerated wound closure, re-epithelialization,
orderly arrangement and deposition of collagen in the Sprague-Dawley
rats with full-thickness skin defects. Further molecular mechanisms
involved to cell proliferation and angiogenesis were carried out. The
cell proliferation biomarkers (Ki67 and PCNA) and angiogenesis
biomarkers (VEGF and CD31) were significantly up-regulated treated with
RHC/EGF freeze-dried dressing. These findings demonstrated RHC/EGF
freeze-dried dressing would be a potential therapeutic strategy in wound
management.