title: A suppressive role of the prolyl isomerase Pin1 in cellular apoptosis mediated by the death-associated protein Daxx.
abstract: The death-associated protein Daxx is a multifunctional factor that regulates a variety of cellular processes, including transcription and apoptosis. Several previous reports have indicated that Daxx is induced upon oxidative stress and is then subjected to phosphorylation-based functional modification. However, the precise molecular events underlying these phosphorylation events remain largely unknown. We report in our current study that the peptidyl-prolyl isomerase Pin1 is highly overexpressed in malignant human gliomas and inhibits Daxx-mediated cellular apoptosis. The targeted inhibition of Pin1 by small interfering RNA in A172 glioblastoma cells significantly enhances the apoptotic response induced by hydrogen peroxide or stimulatory Fas antibodies. This is in turn accompanied by the increased induction of Daxx and the activation of the apoptosis signal-regulating kinase 1/c-Jun N-terminal kinase pathway. Furthermore, Pin1 binds to the phosphorylated Ser178-Pro motif in the Daxx protein, and Pin1 overexpression results in the rapid degradation of Daxx via the ubiquitin-proteasome pathway. Moreover, a Daxx-S178A mutant, which cannot interact with Pin1, demonstrates higher proapoptotic activity and is refractory to Pin1-mediated antiapoptotic effects. We further found that the expression levels of Pin1 inversely correlate with the degree of Daxx nuclear accumulation in human glioblastoma tissues. These results together indicate that Pin1-mediated prolyl isomerization plays an important role in the negative regulation of Daxx and thereby inhibits the oxidative stress-induced cellular apoptotic response, particularly in malignant tumor cells where Pin1 is often overexpressed.
authors.affiliation: Department of Pathology, Yokohama City University School of Medicine, 3-9 Fuku-ura, Kanazawa-ku, Yokohama 236-0004, Japan. aryo@yokohama-cu.ac.jp
authors.forename: Akihide
authors.initials: A
authors.lastname: Ryo
authors.forename: Akiko
authors.initials: A
authors.lastname: Hirai
authors.forename: Mayuko
authors.initials: M
authors.lastname: Nishi
authors.forename: Yih-Cherng
authors.initials: YC
authors.lastname: Liou
authors.forename: Kilian
authors.initials: K
authors.lastname: Perrem
authors.forename: Sheng-Cai
authors.initials: SC
authors.lastname: Lin
authors.forename: Hisashi
authors.initials: H
authors.lastname: Hirano
authors.forename: Sam W
authors.initials: SW
authors.lastname: Lee
authors.forename: Ichiro
authors.initials: I
authors.lastname: Aoki
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000911:Antibodies, Monoclonal / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000235:genetics; D016923:Cell Death / Q000187:drug effects / Q000235:genetics; D056970:Co-Repressor Proteins; D005910:Glioma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D006367:HeLa Cells; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D048031:JNK Mitogen-Activated Protein Kinases / Q000235:genetics / Q000378:metabolism; D048848:MAP Kinase Kinase Kinase 5 / Q000235:genetics / Q000378:metabolism; D018832:Molecular Chaperones; D000072340:NIMA-Interacting Peptidylprolyl Isomerase; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D016877:Oxidants / Q000494:pharmacology; D018384:Oxidative Stress / Q000187:drug effects / Q000235:genetics; D019696:Peptidylprolyl Isomerase / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D046988:Proteasome Endopeptidase Complex / Q000235:genetics / Q000378:metabolism; D011499:Protein Processing, Post-Translational / Q000187:drug effects / Q000235:genetics; D034741:RNA, Small Interfering / Q000235:genetics; D025801:Ubiquitin / Q000235:genetics / Q000378:metabolism; D019014:fas Receptor / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000911:Antibodies, Monoclonal; D056970:Co-Repressor Proteins; C106985:DAXX protein, human; D018832:Molecular Chaperones; D000072340:NIMA-Interacting Peptidylprolyl Isomerase; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D016877:Oxidants; D034741:RNA, Small Interfering; D025801:Ubiquitin; D019014:fas Receptor; D006861:Hydrogen Peroxide; D048031:JNK Mitogen-Activated Protein Kinases; D048848:MAP Kinase Kinase Kinase 5; D046988:Proteasome Endopeptidase Complex; C000606846:PIN1 protein, human; D019696:Peptidylprolyl Isomerase