title: Involvement of caspases in apoptosis induced by ultraviolet B irradiation in A431 human epithelioid tumor cells.
abstract: Six hours after ultraviolet B (UVB) irradiation (11.6 mJ/cm2), the viability of A431 cells decreased, and, at the same time, fragmentation of genomic DNA into nucleosomal units was observed. Z-Asp-CH2-DCB (100 microM), an inhibitor of interleukin-1 beta-converting enzyme (caspase-1) and caspase-1-like proteases, markedly inhibited UVB-induced cell death and DNA fragmentation. Both YVAD-CMK, an inhibitor of caspase-1, and DEVD-CHO, an inhibitor of caspase-3, moderately inhibited the UVB-induced cell death. A combination of YVAD-CMK and DEVD-CHO acted additionally in inhibiting cell death. These observations suggest strongly the cooperative involvement of caspases in the apoptosis induced in A431 cells by UVB.
authors.affiliation: Department of Dermatology, School of Life Science, Faculty of Medicine, Tottori University, Yonago, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Iwasaki
authors.forename: M
authors.initials: M
authors.lastname: Izawa
authors.forename: M
authors.initials: M
authors.lastname: Mihara
mesh_terms: D000590:Amino Acid Chloromethyl Ketones / Q000494:pharmacology; D017209:Apoptosis / Q000528:radiation effects*; D001224:Aspartic Acid / Q000031:analogs & derivatives / Q000494:pharmacology; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy / Q000201:enzymology* / Q000532:radiotherapy*; D020170:Caspase 1; D053148:Caspase 3; D020169:Caspases; D002470:Cell Survival / Q000528:radiation effects; D003546:Cysteine Endopeptidases / Q000187:drug effects / Q000378:metabolism* / Q000528:radiation effects; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006801:Humans; D009842:Oligopeptides / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014466:Ultraviolet Rays
chemical_list: D000590:Amino Acid Chloromethyl Ketones; D015853:Cysteine Proteinase Inhibitors; C098738:N-acetyl-tyrosyl-valyl-alanyl-aspartyl chloromethyl ketone; D009842:Oligopeptides; C108637:aspartyl-glutamyl-valyl-aspartal; C093260:benzyloxycarbonyl-Asp-CH2OC(O)-2,6-dichlorobenzene; D001224:Aspartic Acid; C505407:CASP3 protein, human; D053148:Caspase 3; D020169:Caspases; D003546:Cysteine Endopeptidases; D020170:Caspase 1