title: Animal models for transdermal drug delivery.
abstract: The purpose of this investigation was to compare the permeation characteristics of two different compounds (extremely polar and nonpolar), i.e., tritium-labeled water (W) and 14C-labeled 7-hydroxycoumarin (7-OHC), among 16 different species, including human skin. Snake skin exhibited highest permeability for both W and 7-OHC. Permeability and lag time values of W and 7-OHC across Brattleboro rat and hairless guinea pig are very close to human skin. Skin thickness in micrometers (full thickness, epidermis and stratum corneum, and stratum corneum), and number of hair follicles present in each cm2 were determined for each species. There was no relationship between number of hair follicles and permeability values for both W and 7-OHC. The skin thickness (full) was related to the relative permeability values of W, whereas for 7-OHC it was not.
authors.affiliation: Division of Pharmaceutics and Drug Delivery Systems, University of Cincinnati Medical Center, OH, USA.
authors.forename: R
authors.initials: R
authors.lastname: Panchagnula
authors.forename: K
authors.initials: K
authors.lastname: Stemmer
authors.forename: W A
authors.initials: WA
authors.lastname: Ritschel
mesh_terms: D000279:Administration, Cutaneous; D000818:Animals; D002417:Cattle; D006224:Cricetinae; D004285:Dogs; D016503:Drug Delivery Systems; D006168:Guinea Pigs; D018859:Hair Follicle / Q000378:metabolism; D000882:Haplorhini; D006801:Humans; D051379:Mice; D008819:Mice, Nude; D011817:Rabbits; D051381:Rats; D011910:Rats, Brattleboro; D017207:Rats, Sprague-Dawley; D012756:Sheep; D012867:Skin / Q000187:drug effects / Q000378:metabolism*; D012869:Skin Absorption; D012911:Snakes; D013045:Species Specificity; D013552:Swine; D014468:Umbelliferones / Q000378:metabolism*; D014867:Water / Q000378:metabolism
chemical_list: D014468:Umbelliferones; D014867:Water; C031477:7-hydroxycoumarin