title: Protective role of HSP27 against UVC-induced cell death in human cells.
abstract: It is an intriguing problem whether heat shock proteins (HSPs) play a protective role in UVC-induced cell death in human cells, and the problem has not been solved. To search for the HSPs involved in UVC resistance, gene expression profiles using cDNA array were compared between UVC-sensitive human RSa cells and their UVC-resistant variant AP(r)-1 cells. The expression levels of heat shock protein 27 (HSP27) were lower in RSa cells than in AP(r)-1 cells. RSa cells transfected with sense HSP27 cDNA showed slightly lower sensitivity to UVC-induced cell death than the control cells transfected with a vector alone and much lower sensitivity than RSa cells transfected with the antisense HSP27 cDNA. Furthermore, the removal capacities of the two major types of UVC-damaged DNA (thymine dimers and (6-4)photoproducts) in the cells with the up-regulation of HSP27 were moderately elevated compared with those in the control cells, while those in the cells with down-regulation were remarkably suppressed. These results suggest that HSP27 is involved in the UVC-resistance of human cells, at least those tested, possibly via functioning in nucleotide excision repair.
authors.affiliation: Department of Environmental Biochemistry, Graduate School of Medicine, Chiba University, Chiba 260-8670, Japan.
authors.forename: Chieko
authors.initials: C
authors.lastname: Wano
authors.forename: Kazuko
authors.initials: K
authors.lastname: Kita
authors.forename: Shunji
authors.initials: S
authors.lastname: Takahashi
authors.forename: Shigeru
authors.initials: S
authors.lastname: Sugaya
authors.forename: Mizuki
authors.initials: M
authors.lastname: Hino
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hosoya
authors.forename: Nobuo
authors.initials: N
authors.lastname: Suzuki
mesh_terms: D016923:Cell Death / Q000502:physiology / Q000528:radiation effects; D002460:Cell Line; D002470:Cell Survival / Q000502:physiology / Q000528:radiation effects; D004249:DNA Damage / Q000235:genetics / Q000528:radiation effects; D004260:DNA Repair / Q000235:genetics / Q000528:radiation effects; D004255:Deoxyribodipyrimidine Photo-Lyase / Q000378:metabolism / Q000528:radiation effects; D015536:Down-Regulation / Q000235:genetics / Q000528:radiation effects; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism* / Q000528:radiation effects*; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation / Q000235:genetics / Q000528:radiation effects; D005822:Genetic Vectors; D055551:HSP27 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D018832:Molecular Chaperones; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D011740:Pyrimidine Dimers / Q000235:genetics / Q000528:radiation effects; D014162:Transfection; D014466:Ultraviolet Rays; D015854:Up-Regulation / Q000235:genetics / Q000528:radiation effects
chemical_list: D055551:HSP27 Heat-Shock Proteins; C057725:HSPB1 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D009363:Neoplasm Proteins; D011740:Pyrimidine Dimers; C098727:pyrimidine(6-4)pyrimidone photolyase; D004255:Deoxyribodipyrimidine Photo-Lyase