title: [Follicular penetration. An important pathway for topically applied substances].
abstract: The knowledge of penetration pathways in and through the skin is a prerequisite for the development and optimization of topically applied drugs and cosmetics. Skin penetration has been assumed to occur via diffusion though the lipid domains of the stratum corneum. Recent studies show that the skin appendages, especially the hair follicles, play an important role in skin penetration processes. Topically applied substances cannot enter all follicles. We discuss the reasons for the phenomenon of open and closed hair follicles.
authors.affiliation: Klinik für Dermatologie und Allergologie, Medizinische Fakultät Charité, Berlin. jürgen.lademann@charite.de
authors.forename: J
authors.initials: J
authors.lastname: Lademann
authors.forename: N
authors.initials: N
authors.lastname: Otberg
authors.forename: H
authors.initials: H
authors.lastname: Richter
authors.forename: U
authors.initials: U
authors.lastname: Jacobi
authors.forename: H
authors.initials: H
authors.lastname: Schaefer
authors.forename: U
authors.initials: U
authors.lastname: Blume-Peytavi
authors.forename: W
authors.initials: W
authors.lastname: Sterry
mesh_terms: D000279:Administration, Cutaneous; D004396:Coloring Agents / Q000493:pharmacokinetics; D003474:Curcumin / Q000493:pharmacokinetics; D003487:Cyanoacrylates; D004655:Emulsions; D004817:Epidermis / Q000378:metabolism; D006197:Hair / Q000254:growth & development; D018859:Hair Follicle / Q000378:metabolism* / Q000502:physiology / Q000648:ultrastructure; D006801:Humans; D007834:Lasers; D008853:Microscopy / Q000379:methods; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D009824:Ointments; D010539:Permeability; D012629:Sebum / Q000378:metabolism; D012869:Skin Absorption / Q000502:physiology; D014054:Tomography
chemical_list: D004396:Coloring Agents; D003487:Cyanoacrylates; D004655:Emulsions; D009824:Ointments; D003474:Curcumin