Sensitisation of c-MYC-induced B-lymphoma cells to apoptosis by ATF2.
AffiliationDepartment of Cell Regulation, Paterson Institute for Cancer Research, University of Manchester, Manchester, UK.
MetadataShow full item record
AbstractTranscription factors ATF2 (activating transcription factor 2) and ATF7 (activating transcription factor 7) are highly homologous members of the activator protein 1 (AP-1) family. Their activities are growth factor and stress stimulated and they strictly require phosphorylation by mitogen-activated protein (MAP) kinases for their transcriptional functions. In samples of human B-cell lymphomas as well as Eμ-Myc-driven mouse B-cell lymphomas, we find that ATF2 as well as MAP kinase c-Jun N-terminal kinase (JNK) are significantly up-regulated compared with normal human B-cell lines and mouse B cells, respectively. The B cell-specific deletion of ATF2 and ATF7 in mice results in significantly accelerated onset of Eμ-Myc-induced lymphoma. In addition, loss of ATF2/7 desensitises Eμ-Myc lymphoma cells to spontaneous as well as stress-induced apoptosis. Our results therefore suggest that c-MYC induces stress-mediated activation of ATF2 and ATF7 and that these transcription factors regulate apoptosis in response to oncogenic transformation of B cells.Oncogene advance online publication, 18 February 2013; doi:10.1038/onc.2013.28.
CitationSensitisation of c-MYC-induced B-lymphoma cells to apoptosis by ATF2. 2013: Oncogene