Journal
CANCER RESEARCH
Volume 69, Issue 5, Pages 1782-1791Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-08-2256
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Funding
- Korea Science and Engineering Foundation
- Protein Network Research Center at Yonsei University
- Korea Research Foundation [KRF-2006-005-J04502]
- Yonsei Biomedical Science and Technology Initiative Program
- Brain Korea 21 project
- National Research Foundation of Korea [2006-005-J04502] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Various genotoxic agents cause monoubiquitination of NEMO/IKK gamma-the regulatory subunit of I kappa B kinase (IKK) complexin the nucleus. Ubiquitinated NEMO exits from the nucleus and forms a complex with the IKK catalytic subunits IKK alpha and IKK beta, resulting in IKK activation and, ultimately, nuclear factor-kappa B (NF-kappa B) activation. Thus, NEMO ubiquitination is a prerequisite for H(K-dependent activation of NF-kappa B. However, the IKK activation mechanism is unknown and the NEMO-ubiquitinating E3 enzyme has not been identified. We found that inhibitors of apoptosis protein (MY) regulate genotoxic stress-induced NF-kappa B activation at different levels. XIAP mediates activation of the upstream IKK kinase, TAK1, and couples activated TAK1 to the IKK complex. This XIAP-dependent event occurs in response to camptotechin or etoposide/VP16; however, XIAP is dispensable for activation of NF-kappa B by doxorubicin, which engages a MEK-ERK pathway to activate IKK. We also show that cIAP1 mediates NEMO ubiquitination and cIAP2 regulates an event downstream of NEW ubiquitination. Our study highlights nonredundant cooperative contributions of IAPs to antiapoptotic NF-kappa B activation by genotoxic signals beyond their classic caspase inhibitory functions. [Cancer Res 2009;69(5):1782-91]
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