title: In vitro and in vivo study of 5-methoxypsoralen skin concentration after topical application.
abstract: The aim of this work was to study the skin distribution of 5-methoxypsoralen (5-MOP) after application of topical gels, in vitro and in vivo, in both healthy and psoriatic skin sites of 6 psoriatic patients. Drug skin distribution was determined using the thin slicing technique and subsequent HPLC analysis. In the presence of dermatological disease, i.e. psoriasis, the permeability of the tissue changed considerably, leading to an important increase in the cumulative amount of 5-MOP recovered in the skin after topical application. The amount of 5-MOP found in vitro in the human skin was intermediate between those cumulated in healthy and psoriatic skin sites during an in vivo experiment. The gel formulation is an efficacious carrier for the topical photochemotherapy of psoriasis with 5-MOP, since it allows drug penetration in psoriatic skin.
authors.affiliation: Department of Pharmacy, Faculty of Medicine, University of Parma, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Colombo
authors.forename: A
authors.initials: A
authors.lastname: Zucchi
authors.forename: F
authors.initials: F
authors.lastname: Allegra
authors.forename: P
authors.initials: P
authors.lastname: Colombo
authors.forename: F
authors.initials: F
authors.lastname: Zani
authors.forename: P
authors.initials: P
authors.lastname: Santi
mesh_terms: D000078223:5-Methoxypsoralen; D000279:Administration, Cutaneous; D000328:Adult; D000368:Aged; D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D005782:Gels; D006801:Humans; D066298:In Vitro Techniques; D007641:Keratolytic Agents / Q000008:administration & dosage / Q000493:pharmacokinetics* / Q000627:therapeutic use; D008297:Male; D008730:Methoxsalen / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000493:pharmacokinetics* / Q000627:therapeutic use; D008875:Middle Aged; D011565:Psoriasis / Q000188:drug therapy / Q000378:metabolism; D012867:Skin / Q000378:metabolism*; D012869:Skin Absorption
chemical_list: D005782:Gels; D007641:Keratolytic Agents; D000078223:5-Methoxypsoralen; D008730:Methoxsalen