The NF-kappa B-inducing kinase induces PC12 cell differentiation and prevents apoptosis |
| |
Authors: | Foehr E D Bohuslav J Chen L F DeNoronha C Geleziunas R Lin X O'Mahony A Greene W C |
| |
Institution: | Gladstone Institute of Virology and Immunology, University of California, San Francisco, California 94141, USA. efoehr@gladstone.ucsf.edu |
| |
Abstract: | NF-kappa B has been implicated in the survival and differentiation of PC12 cells. In this study, we examined the effect of the NF-kappa B-inducing kinase (NIK) on these processes. When inducibly expressed in PC12 cells, a kinase-proficient but not -deficient form of NIK promoted neurite process formation and mediated anti-apoptotic signaling. As expected, NIK expression led to I kappa B kinase activation and induced nuclear translocation of NF-kappa B. However, NIK-induced neurite outgrowth was only partially blocked by concomitant expression of a nondegradable form of I kappa B alpha that completely blocks NF-kappa B induction. In search of additional signaling pathways activated by NIK, we now demonstrate that NIK activates MEK1 phosphorylation and induces the Erk1/Erk2 MAPK pathway. Treatment of PC12 cells with PD98059, a MEK1 inhibitor, potently blocked neurite process formation; however, a dominantly interfering mutant of the upstream Shc adapter failed to alter this response. These findings reveal a new function for NIK as a MEK1-dependent activator of the MAPK pathway and implicate both the I kappa B kinase and MAPK signaling cascades in NIK-induced differentiation of PC12 cells. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|