Nuclear integration of JAK/STAT and Ras/AP-1 signaling by CBP and p300
AUTOR(ES)
Horvai, Andrew E.
FONTE
The National Academy of Sciences of the USA
RESUMO
We report that interferon γ (IFN-γ) inhibits transcription of the macrophage scavenger receptor gene by antagonizing the Ras-dependent activities of AP-1 and cooperating ets domain transcription factors, apparently as a result of competition between AP-1/ets factors and activated STAT1 for limiting amounts of CBP and p300. Consistent with this model, STAT1α interacts directly with CBP in cells, and microinjection of anti-CBP and anti-p300 antibodies blocks transcriptional responses to IFN-γ. Cells lacking STAT1 fail to inhibit AP-1/ets activity, and overexpression of CBP both potentiates IFN-γ-dependent transcription and relieves AP-1/ets repression. Thus, CBP and p300 integrate both positive and negative effects of IFN-γ on gene expression by serving as essential coactivators of STAT1α, modulating gene-specific responses to simultaneous activation of two or more signal transduction pathways.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=19746Documentos Relacionados
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