Journal
BLOOD
Volume 104, Issue 3, Pages 784-787Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2003-09-3071
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Funding
- NCI NIH HHS [T32 CA09054] Funding Source: Medline
- NIAID NIH HHS [AI50831] Funding Source: Medline
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Transcription factors of the Forkhead Box, class O (FOXO) family promote cell-cycle arrest and/or apoptosis in a variety of cell types. Mitogenic stimuli inactivate FOXO function by way of an evolutionarily conserved pathway involving the activation of phosphoinositide 3-kinase (Pl3K) and its downstream effector, Akt. Although Pl3K activation is required for B-lympho-cyte proliferation, it is not known whether Pl3K-dependent inactivation of FOXO proteins is important for cell-cycle progression and survival of these cells. Here, we show that B-cell receptor (BCR) engagement triggers Pl3K-dependent phosphorylation and nuclear export of FOXO1. Furthermore, forced expression of Pl3K-independent variants of FOXO1 or FOXO3a in activated B cells induces partial arrest in G, phase of the cell cycle and increases apoptosis. These findings establish that FOXO inactivation is a functionally important consequence of Pl3K signaling in primary B cells.
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