Abstract
The CEF-4/9E3 chemokine gene is expressed constitutively in chicken embryo fibroblasts (CEF) transformed by the Rous sarcoma virus (RSV). This aberrant induction is controlled at the transcriptional and post-transcriptional levels. Transcriptional activation depends on multiple elements of the CEF-4 promoter composing a Src-responsive-Unit or SRU. The SRU includes a TPA responsive element, a PRDII/κB domain and a CAAT box. In this report, we identify C/EBPβ as a component of the trans-acting factor interacting with the CAAT box of the CEF-4 promoter. In addition, we show that C/EBPβ binds to a second element located in proximity of the TRE. A mutation of this distal CAAT box impaired the activation of the CEF-4 promoter by pp60v-src indicating that this element is also part of the SRU. Using the RCASBP retroviral vector, we expressed a dominant negative mutant of C/EBPβ (designated Δ184-C/EBPβ) in RSV-transformed CEF. Δ184-C/EBPβ decreased the accumulation of the CEF-4 mRNA and activation of the CEF-4 promoter by pp60v-src. The induction of the Cox-2 gene (CEF-147) was also reduced by Δ184-C/EBPβ. The effect of the dominant negative mutant was observed within 1 h of the activation of a thermolabile pp60v-src suggesting that C/EBPβ is an early target of v-src transformation. The dominant negative mutant did not inhibit the transformation of CEF by RSV and in fact accentuated the transformed cell phenotype. Therefore, the activation of C/EBPβ is important for the expression of v-src regulated genes but is not required for the in vitro transformation of CEF by pp60v-src.
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Acknowledgements
We thank Dr C Calkhoven for the avian C/EBPα clone, Dr A Leutz for providing expression constructs for avian C/EBPβ, Dr S Hughes for the RCASBP retroviral vectors, Dr Germain Gillet for providing clone NR-13 and Dr Dan Simmons for the Cox-2 cDNA. We are indebted to Dr E Cabannes for preparation of the RCASBP-C/EBPβ construct and G Temple for preparation of the figures. This work was funded by a grant from the Canadian Institute for Health Research to P-A Bédard.
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Gagliardi, M., Maynard, S., Bojovic, B. et al. The constitutive activation of the CEF-4/9E3 chemokine gene depends on C/EBPβ in v-src transformed chicken embryo fibroblasts. Oncogene 20, 2301–2313 (2001). https://doi.org/10.1038/sj.onc.1204354
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DOI: https://doi.org/10.1038/sj.onc.1204354