The Journal of Experimental Medicine
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Published online 26 June 2006 doi:10.1084/jem.20060353
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 203, Number 7, 1657-1663
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BRIEF DEFINITIVE REPORT

FOXO3a-dependent regulation of Puma in response to cytokine/growth factor withdrawal

Han You1,2, Marc Pellegrini1,2, Katsuya Tsuchihara1,2, Kazuo Yamamoto1,2, Georg Hacker3, Miriam Erlacher4, Andreas Villunger4, and Tak W. Mak1,2

1 The Campbell family Institute for Breast Cancer Research, University Health Network, Toronto, Ontario M5G 2C1, Canada 2 Department of Medical Biophysics and Immunology, University of Toronto, Toronto, Ontario M5G 2M9, Canada 3 Institute for Medical Microbiology, Technische Universitat Munchen, D-81675 Munich, Germany 4 Division of Experimental Pathophysiology and Immunology, BIOCENTER, Innsbruck Medical University, Innsbruck, A-6020 Austria

CORRESPONDENCE Tak W. Mak: tmak{at}uhnres.utoronto.ca

Puma is an essential mediator of p53-dependent and -independent apoptosis in vivo. In response to genotoxic stress, Puma is induced in a p53-dependent manner. However, the transcription factor driving Puma up-regulation in response to p53-independent apoptotic stimuli has yet to be identified. Here, we show that FOXO3a up-regulates Puma expression in response to cytokine or growth factor deprivation. Importantly, dysregulated Akt signaling in lymphoid cells attenuated Puma induction upon cytokine withdrawal. Our results suggest that Puma, together with another BH3 only member, Bim, function as FOXO3a downstream targets to mediate a stress response when PI3K/Akt signaling is down-regulated.



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