title: Mouse epidermal cell renewal after topical treatment with different concentrations of the epidermal peptide pyroGlu-Glu-Asp-Ser-GlyOH.
abstract: Earlier work has shown that epidermal cells contain a peptide, pyroGlu-Glu-Asp-Ser-GlyOH, that induces a moderate but long-lasting inhibition of epidermal cell proliferation when given at low (picomol) doses ip in vivo and in vitro. In the present study, the epidermal pentapeptide was applied topically to the back skin of hairless mice at different concentrations and in a water-miscible cream. A single topical application of either high (0.25% wt/wt) or low (0.004% or 0.02% wt/wt) doses of the pentapeptide was followed by oscillations in epidermal DNA synthesis and G2-M cell flux (mitotic rate). In general, epidermal cell proliferation was inhibited during the first 10-day period after treatment with the two lower doses, while the highest concentration of pentapeptide (0.25%) stimulated epidermal cell proliferation. In spite of the effects on epidermal cell proliferation the size of the epidermal cell population in the treated area (number of nucleated cells and epidermal thickness) showed no corresponding alterations. The results could imply that the epidermal pentapeptide modifies epidermal cell proliferation and terminal differentiation in such a way that the two are balance with each other.
authors.affiliation: Institute of Pathology, Rikshospitalet, Oslo, Norway.
authors.forename: K
authors.initials: K
authors.lastname: Elgjo
authors.forename: K L
authors.initials: KL
authors.lastname: Reichelt
mesh_terms: D000287:Administration, Topical; D000595:Amino Acid Sequence; D000818:Animals; D002452:Cell Count; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D004247:DNA / Q000096:biosynthesis; D000078404:Epidermal Cells; D004817:Epidermis / Q000378:metabolism; D005260:Female; D006131:Growth Inhibitors / Q000008:administration & dosage / Q000494:pharmacology*; D007700:Kinetics; D051379:Mice; D008812:Mice, Hairless; D008938:Mitosis; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000008:administration & dosage / Q000494:pharmacology*; D011761:Pyrrolidonecarboxylic Acid / Q000031:analogs & derivatives
chemical_list: D006131:Growth Inhibitors; D009842:Oligopeptides; C050550:epidermal pentapeptide; D004247:DNA; D011761:Pyrrolidonecarboxylic Acid