title: [Skin aging].
abstract: Like the entire human organism, the skin is subject to an intrinsic unpreventable aging process. But exogenous factors also influence skin aging. Ultraviolet radiation in particular results in premature skin aging, also referred to as extrinsic skin aging or photo aging, causing in large part aging-associated changes in sun-exposed areas. Intrinsic and extrinsic aging share several molecular similarities despite morphological and pathophysiological differences. The formation of reactive oxygen species and the induction of metalloproteinases reflect central aspects of skin aging. Accumulation of fragmented collagen fibrils prevents neocollagenesis and accounts for further degradation of extracellular matrix by means of positive feedback regulation. The importance of extrinsic factors in skin aging and the detection of its mechanisms has given rise to development of various therapeutic and preventive strategies.
authors.affiliation: Klinik und Poliklinik für Dermatologie, Universitätsklinikum Regensburg, 93053 Regensburg. Elisabeth.Kohl@klinik.uni-regensburg.de
authors.forename: E
authors.initials: E
authors.lastname: Kohl
authors.forename: M
authors.initials: M
authors.lastname: Landthaler
authors.forename: R-M
authors.initials: RM
authors.lastname: Szeimies
mesh_terms: D003879:Dermatologic Agents / Q000008:administration & dosage*; D006801:Humans; D008954:Models, Biological; D015595:Skin Aging / Q000187:drug effects* / Q000502:physiology* / Q000528:radiation effects; D012993:Solar Energy; D014466:Ultraviolet Rays
chemical_list: D003879:Dermatologic Agents