title: Evidence that DNA damage triggers interleukin 10 cytokine production in UV-irradiated murine keratinocytes.
abstract: UV irradiation interferes with the induction of T cell-mediated immune responses, in part by causing cells in the skin to produce immunoregulatory cytokines. Recent evidence implicates UV-induced DNA damage as a trigger for the cascade of events leading to systemic immune suppression in vivo. However, to date, there has been no direct evidence linking DNA damage and cytokine production in UV-irradiated cells. Here we provide such evidence by showing that treatment of UV-irradiated murine keratinocytes in vitro with liposomal T4 endonuclease V, which accelerates the repair of cyclobutylpyrimidine dimers in these cells, inhibits their production of immunosuppressive cytokines, including interleukin 10. Application of these liposomes to murine skin in vivo also reduced the induction of interleukin 10 by UV irradiation, whereas liposomes containing heat-inactivated T4 endonuclease V were ineffective. These results support our hypothesis that unrepaired DNA damage in the skin activates the production of cytokines that down-regulate immune responses initiated at distant sites.
authors.affiliation: Department of Immunology, University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
authors.forename: C
authors.initials: C
authors.lastname: Nishigori
authors.forename: D B
authors.initials: DB
authors.lastname: Yarosh
authors.forename: S E
authors.initials: SE
authors.lastname: Ullrich
authors.forename: A A
authors.initials: AA
authors.lastname: Vink
authors.forename: C D
authors.initials: CD
authors.lastname: Bucana
authors.forename: L
authors.initials: L
authors.lastname: Roza
authors.forename: M L
authors.initials: ML
authors.lastname: Kripke
mesh_terms: D000818:Animals; D002461:Cell Line, Transformed; D002478:Cells, Cultured; D004249:DNA Damage / Q000276:immunology*; D043224:Deoxyribonuclease (Pyrimidine Dimer); D004337:Drug Carriers; D004706:Endodeoxyribonucleases / Q000096:biosynthesis / Q000378:metabolism; D005260:Female; D006968:Hypersensitivity, Delayed; D016753:Interleukin-10 / Q000096:biosynthesis*; D007519:Isoantigens / Q000276:immunology; D015603:Keratinocytes / Q000276:immunology / Q000502:physiology / Q000528:radiation effects*; D008081:Liposomes; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000378:metabolism; D012867:Skin / Q000276:immunology* / Q000528:radiation effects; D012879:Skin Physiological Phenomena; D014162:Transfection; D014466:Ultraviolet Rays; D014764:Viral Proteins
chemical_list: D004337:Drug Carriers; D007519:Isoantigens; D008081:Liposomes; D011994:Recombinant Proteins; D014764:Viral Proteins; D016753:Interleukin-10; D004706:Endodeoxyribonucleases; C470698:endonuclease V, phage T4; D043224:Deoxyribonuclease (Pyrimidine Dimer)