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  • Original Paper
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CBP and histone deacetylase inhibition enhance the transactivation potential of the HOXB7 homeodomain-containing protein

Abstract

Homeodomain-containing proteins are transcription factors regulating the coordinated expression of multiple target genes involved in development, differentiation and cellular transformation. In this study, we demonstrated that HOXB7, one member of this family, behaved as a transactivator in breast cancer cells. Deletion of either the HOXB7 N-terminal domain or the C-terminal acidic tail abolished this transcriptional effect, suggesting a combination of distinct functional transactivating domains. HOXB7 physically interacted both in vitro and in vivo with the coactivator CREB-binding protein (CBP). This interaction led to an enhanced transactivating potential and required the N-terminal of HOXB7 as well as two domains located at the C-terminal part of CBP. Moreover, trichostatin A, a deacetylase inhibitor, strongly enhanced the transcriptional properties of HOXB7. Our data therefore indicate that HOX proteins can directly interact with CBP and that acetylation/deacetylation may regulate their transcriptional properties.

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Acknowledgements

The authors are grateful to Dr Zappavigna for the gift of the pTCBS and pT109 plasmids, to Drs Kouzarides and Roeder for the GST-CBP plasmids and to Drs Evans and Montminy for the gift of both the CMX-CBP and the GAL4-CBP plasmids. V Bours and M-P Merville are Research Associates of the National Fund for Scientific Research (`FNRS', Belgium). A Chariot is a Research Assistant at the University of Liege and is supported by postdoctoral grants provided by both the NATO and the Fulbright Commission. This work was also supported by grants from the National Fund for Scientific Research. Télévie (Belgium) and the Centre Anti Cancéreux (University of Liège, Belgium).

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Chariot, A., van Lint, C., Chapelier, M. et al. CBP and histone deacetylase inhibition enhance the transactivation potential of the HOXB7 homeodomain-containing protein. Oncogene 18, 4007–4014 (1999). https://doi.org/10.1038/sj.onc.1202776

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