title: Topical application of epidermal growth factor accelerates wound healing by myofibroblast proliferation and collagen synthesis in rat.
abstract: Recombinant human epidermal growth factor (rhEGF) stimulates the proliferation and migration of epithelial cells in human cell culture systems and animal models of partial-thickness skin wounds. This study investigated the effect of a topical rhEGF ointment on the rate of wound healing and skin re-epithelialization in a rat full thickness wound model, and verified whether or not the rhEGF treatment affected both myofibroblast proliferation and collagen synthesis in the dermis. When rhEGF (10 microgram/g ointment) was applied topically twice a day for 14 days, there was significantly enhanced wound closure from the 5th to the 12th day compared with the control (ointment base treatment) group. A histological examination at the postoperative 7th day revealed that the rhEGF treatment increased the number of proliferating nuclear antigen immunoreactive cells in the epidermis layer. In addition, the immunoreactive area of alpha-smooth muscle actin and the expression of prolyl 4-hydroxylase were significantly higher than those of the control group. Overall, a topical treatment of rhEGF ointment promotes wound healing by increasing the rate of epidermal proliferation and accelerating the level of wound contraction related to myofibroblast proliferation and collagen deposition.
authors.affiliation: Department of Pharmacology, Chonbuk National University Medical School, Jeonju 561-756, Korea.
authors.forename: Young-Bae
authors.initials: YB
authors.lastname: Kwon
authors.forename: Hyun-Woo
authors.initials: HW
authors.lastname: Kim
authors.forename: Dae-Hyun
authors.initials: DH
authors.lastname: Roh
authors.forename: Seo-Yeon
authors.initials: SY
authors.lastname: Yoon
authors.forename: Rong-Min
authors.initials: RM
authors.lastname: Baek
authors.forename: Jeum-Yong
authors.initials: JY
authors.lastname: Kim
authors.forename: HaeYong
authors.initials: H
authors.lastname: Kweon
authors.forename: Kwang-Gill
authors.initials: KG
authors.lastname: Lee
authors.forename: Young-Hwan
authors.initials: YH
authors.lastname: Park
authors.forename: Jang-Hern
authors.initials: JH
authors.lastname: Lee
mesh_terms: D000199:Actins / Q000235:genetics / Q000378:metabolism; D000287:Administration, Topical; D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects; D003094:Collagen / Q000096:biosynthesis*; D004815:Epidermal Growth Factor / Q000008:administration & dosage* / Q000494:pharmacology*; D005786:Gene Expression Regulation; D008297:Male; D032448:Myoblasts, Skeletal / Q000187:drug effects*; D018809:Proliferating Cell Nuclear Antigen / Q000235:genetics / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D014945:Wound Healing / Q000187:drug effects*
chemical_list: D000199:Actins; D003094:Collagen; D004815:Epidermal Growth Factor; D018809:Proliferating Cell Nuclear Antigen; C498862:Acta2 protein, rat