期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 106, 期 41, 页码 17389-17394出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0812259106
关键词
apoptosis; calcium; MAPK
资金
- BK21 postdoctoral fellowship
- Brain Research Center of the 21st Century Frontier Research Program [M103KV010004-08K2201-00410]
- Korea Research Foundation [KRF-2006-341-C00023]
- National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology, South Korea [20090080895]
- National Research Foundation of Korea [2006-341-C00023] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Calcium and integrin binding protein 1 (CIB1) is a Ca2+-binding protein of 22 kDa that was initially identified as a protein that interacts with integrin alpha(IIb). Although it interacts with various proteins and has been implicated in diverse cellular functions, the molecular mechanism by which CIB1 regulates intracellular signaling networks has remained unclear. We now show that, by targeting apoptosis signal-regulating kinase 1 (ASK1), CIB1 negatively regulates stress-activated MAPK signaling pathways. CIB1 was thus shown to bind to ASK1, to interfere with the recruitment of TRAF2 to ASK1, and to inhibit the autophosphorylation of ASK1 on threonine-838, thereby blocking ASK1 activation. Furthermore, CIB1 mitigated apoptotic cell death initiated either by TNF-alpha in breast cancer MCF7 cells or by 6-hydroxydopamine (6-OHDA) in dopaminergic cells. Ca2+ influx induced by membrane depolarization reversed the inhibitory effect of CIB1 on 6-OHDA-induced ASK1 activation and cell death in dopaminergic neurons. These observations thus suggest that CIB1 functions as a Ca2+-sensitive negative regulator of ASK1-mediated signaling events.
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