title: Forskolin protects keratinocytes from UVB-induced apoptosis and increases DNA repair independent of its effects on melanogenesis.
abstract: Melanin pigments provide efficient protection against ultraviolet B (UVB) radiation but DNA repair also plays a key role in eliminating UV-induced damage and preventing the development of skin cancers. In this study, we demonstrate that forskolin (FSK), an agent that increases intracellular levels of cAMP, protects keratinocytes from UVB-induced apoptosis independently from the amount of melanin in the skin. FSK enhances the removal of the two major types of UVB-induced DNA damage, cyclobutane pyrimidine dimers and 6,4-photoproducts, by facilitating DNA repair. These findings suggest new preventive approaches with topical formulations of FSK or other bioactive agents that could be applied to the skin before sun exposure to increase its ability to repair DNA damage.
authors.affiliation: Pigment Cell Biology Section, Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892, USA.
authors.forename: Thierry
authors.initials: T
authors.lastname: Passeron
authors.forename: Takeshi
authors.initials: T
authors.lastname: Namiki
authors.forename: Hélène J
authors.initials: HJ
authors.lastname: Passeron
authors.forename: Elodie
authors.initials: E
authors.lastname: Le Pape
authors.forename: Vincent J
authors.initials: VJ
authors.lastname: Hearing
mesh_terms: D017209:Apoptosis; D002478:Cells, Cultured; D005576:Colforsin / Q000378:metabolism / Q000494:pharmacology*; D003470:Culture Media / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism; D004249:DNA Damage; D004260:DNA Repair; D004817:Epidermis / Q000473:pathology; D006801:Humans; D015603:Keratinocytes / Q000166:cytology / Q000378:metabolism*; D008544:Melanocytes / Q000166:cytology*; D008954:Models, Biological; D012867:Skin / Q000473:pathology; D012880:Skin Pigmentation; D014466:Ultraviolet Rays
chemical_list: D003470:Culture Media; D005576:Colforsin; D000242:Cyclic AMP