title: p57KIP2 modulates stress-activated signaling by inhibiting c-Jun NH2-terminal kinase/stress-activated protein Kinase.
abstract: p57KIP2, a member of the Cip/Kip family of enzymes that inhibit several cyclin-dependent kinases, plays a role in many biological events including cell proliferation, differentiation, apoptosis, tumorigenesis and developmental changes. The human p57KIP2 gene is located in chromosome 11p15.5, a region implicated in sporadic cancers and Beckwith-Wiedemann syndrome. We here report that p57KIP2 physically interacts with and inhibits c-Jun NH2-terminal kinase/stress-activated protein kinase (JNK/SAPK). The carboxyl-terminal QT domain of p57KIP2 is crucial for the inhibition of JNK/SAPK. Overexpressed p57KIP2 also suppressed UV- and MEKK1-induced apoptotic cell death. p57KIP2 expression during C2C12 myoblast differentiation resulted in repression of the JNK activity stimulated by UV light. Furthermore, UV-stimulated JNK1 activity was higher in mouse embryonic fibroblasts derived from p57-/- mice than in the cells from wild-type mice. Taken together, these findings suggest that p57KIP2 modulates stress-activated signaling by functioning as an endogenous inhibitor of JNK/SAPK.
authors.affiliation: National Creative Research Initiative Center for Cell Death, School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea.
authors.forename: Tong-Shin
authors.initials: TS
authors.lastname: Chang
authors.forename: Myung Jin
authors.initials: MJ
authors.lastname: Kim
authors.forename: Kanghyun
authors.initials: K
authors.lastname: Ryoo
authors.forename: Jihyun
authors.initials: J
authors.lastname: Park
authors.forename: Soo-Jung
authors.initials: SJ
authors.lastname: Eom
authors.forename: Jaekyung
authors.initials: J
authors.lastname: Shim
authors.forename: Keiichi I
authors.initials: KI
authors.lastname: Nakayama
authors.forename: Keiko
authors.initials: K
authors.lastname: Nakayama
authors.forename: Motowo
authors.initials: M
authors.lastname: Tomita
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Takahashi
authors.forename: Min-Jae
authors.initials: MJ
authors.lastname: Lee
authors.forename: Eui-Ju
authors.initials: EJ
authors.lastname: Choi
mesh_terms: D000818:Animals; D017209:Apoptosis; D002454:Cell Differentiation; D002460:Cell Line; D002470:Cell Survival; D002478:Cells, Cultured; D050761:Cyclin-Dependent Kinase Inhibitor p57; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006367:HeLa Cells; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases; D048728:MAP Kinase Kinase Kinase 1; D051379:Mice; D018345:Mice, Knockout; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048055:Mitogen-Activated Protein Kinase 8; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors* / Q000378:metabolism; D009687:Nuclear Proteins / Q000378:metabolism / Q000502:physiology*; D010957:Plasmids / Q000378:metabolism; D011233:Precipitin Tests; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D015398:Signal Transduction; D014162:Transfection; D014466:Ultraviolet Rays
chemical_list: C493964:CDKN1C protein, human; C493965:Cdkn1c protein, mouse; D050761:Cyclin-Dependent Kinase Inhibitor p57; D004791:Enzyme Inhibitors; D009687:Nuclear Proteins; D017346:Protein Serine-Threonine Kinases; D048031:JNK Mitogen-Activated Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048055:Mitogen-Activated Protein Kinase 8; D020928:Mitogen-Activated Protein Kinases; D048728:MAP Kinase Kinase Kinase 1; C482576:MAP3K1 protein, human; C482578:Map3k1 protein, mouse