Abstract:
:Exposure of mammalian cells to UV irradiation leads to activation of the c-Jun NH(2)-terminal protein kinase (JNK) pathway, which is associated with cell apoptosis. However, the molecular mechanism for JNK activation by UV exposure is not fully understood. We show here an essential role of a multisubstrate adapter, Gab1, in this signaling cascade. Gab1-deficient mouse fibroblast cells were defective in induction of JNK activity by UV exposure or heat shock, and this defect was rescued by reintroduction of Gab1 into Gab1(-/-) cells. Consistently, Gab1(-/-) cells displayed reduced caspase 3 induction and apoptotic cell death in response to UV irradiation. Gab1 was constitutively complexed with JNK and became tyrosine phosphorylated in UV-irradiated cells. Genetic and pharmaceutical analyses suggest the involvement of c-Met and the Src family tyrosine kinases in mediating UV-induced Gab1 phosphorylation as well as JNK activation. In aggregate, these observations identify a new function of Gab1 in the response of mammalian cells to UV light.
journal_name
Mol Cell Bioljournal_title
Molecular and cellular biologyauthors
Sun Y,Yuan J,Liu H,Shi Z,Baker K,Vuori K,Wu J,Feng GSdoi
10.1128/mcb.24.4.1531-1539.2004subject
Has Abstractpub_date
2004-02-01 00:00:00pages
1531-9issue
4eissn
0270-7306issn
1098-5549journal_volume
24pub_type
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