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Brn-3a/POU4F1 interacts with and differentially affects p73-mediated transcription

Hudson, CD; Sayan, AE; Melino, G; Knight, RA; Latchman, DS; Budhram-Mahadeo, V; (2008) Brn-3a/POU4F1 interacts with and differentially affects p73-mediated transcription. CELL DEATH DIFFER , 15 (8) 1266 - 1278. 10.1038/cdd.2008.45.

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Abstract

The Brn-3a/POU4F1 POU transcription factor is critical for the survival and differentiation of specific sensory neurons during development or upon injury; by regulating expression of target genes, either directly or indirectly upon interaction with other proteins. In this study, we demonstrated the physical interaction of Brn-3a with different p73 isoforms and showed co-localization in sensory neurons arising from the neural crest. The biological effects of p73/Brn-3a interaction depend on the particular p73 isoform, because co-expression of Brn-3a with TAp73 enhanced cell cycle arrest, whereas Brn-3a and DNp73 cooperated to increase protection from apoptosis. Brn-3a antagonized TAp73 transactivation of pro-apoptotic Bax, but cooperated to increase transcription of the cell cycle regulator p21(CIP1/Waf1). The region 425-494 amino acids within the TAp73 C terminus were critical for Brn-3a to repress Bax transactivation, but not for cooperation on the p21(CIP1/Waf1) promoter. Our results suggest that co-factors binding to the p73 C terminus facilitate maximal activation on the Bax but not p21(CIP1/Waf1) promoter and that Brn-3a modulates this interaction. Thus, the physical interaction of Brn-3a with specific p73 isoforms will be critical for determining cell fate during neuronal development or in injured neurons expressing both factors.

Type: Article
Title: Brn-3a/POU4F1 interacts with and differentially affects p73-mediated transcription
DOI: 10.1038/cdd.2008.45
Keywords: apoptosis, Brn-3a, POU4F1, neuronal differentiation, p73, transcription, YES-ASSOCIATED PROTEIN, PROMOTES NEURONAL SURVIVAL, POU DOMAIN, IN-VIVO, CNS NEURONS, BRN-3A, P73, P53, APOPTOSIS, FAMILY
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > Institute of Cardiovascular Science
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > Institute of Cardiovascular Science > Pre-clinical and Fundamental Science
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > UCL GOS Institute of Child Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > UCL GOS Institute of Child Health > ICH - Directors Office
URI: http://discovery.ucl.ac.uk/id/eprint/91556
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