Journal
JOURNAL OF WOUND CARE
Volume 30, Issue 9, Pages -Publisher
MA HEALTHCARE LTD
DOI: 10.12968/jowc.2021.30.Sup9a.IX
Keywords
acute wound healing; animal model; chitosan; conventional dressing; epidermal growth factor; microencapsulation; oligopeptide-1 rhEGF; recombinant human EGF; spray solution; topical spray; wound; wound care; wound healing
Categories
Funding
- Research and Development Award Scheme from Taichung Hospital
- Ministry of Science and Technology of Taiwan
- Higher Education Sprout Project from the Ministry of Education of Taiwan
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The study showed that wounds treated with rhEGF spray had the greatest size reduction by day 14 and promoted higher levels of mature Type I collagen synthesis, leading to regenerated tissue alignment with normal skin. The use of a new drug delivery technology, chitosan-rhEGF nanoparticles, overcame challenges associated with topical application of rhEGF, demonstrating the therapeutic potentials of this novel rhEGF topical spray solution.
Aims: Chitosan and epidermal growth factor (EGF) have been shown to improve wound healing. This study investigates the healing effects of a spray solution (NewEpi, JoyCom Bio-Chem Co. Ltd., Taiwan) containing recombinant human EGF (rhEGF) delivered via a newly patented technology-chitosan microencapsulated nanoparticles. Methods: On Wistar rats, two full-thickness wounds on the dorsum bilateral of the spine were created. The rats were randomised to the following treatment groups: hydrogel, wet dressing, foam, rhEGF spray and rhEGF spray+foam. Sterile dressings were applied and changed daily. A total of 2 mu g of rhEGF was administered in two sprays during each dressing change. All animals were euthanised on day 14. Tissue samples were taken from the wound bed, including an area of 2cm surrounding the wound margin for histological evaluations. Results: Wounds treated with the rhEGF spray achieved the greatest size reduction by day 14 compared with other types of conventional dressings. An overall significant difference in levels of collagen synthesis existed between groups (p<0.01). Pair-wise comparisons showed that the rhEGF spray treatment significantly promoted higher levels of mature Type I collagen than any other conventional dressings (p<0.01), whereas non-rhEGF treatments resulted in higher levels of Type III collagen. The regenerated tissue in rhEGF spray treatment groups was also in alignment with that of normal skin. Epidermis, dermis and hair follicles were easily observed in wounds treated with the rhEGF spray. Conclusion: The major challenge of topical application of rhEGF was overcome by using a new drug delivery technology: chitosan-rhEGF nanoparticles. The positive healing effects observed in this study suggest the therapeutic potentials of this novel rhEGF topical spray solution.
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