Authors: Alam H; Williams TW; Dumas KJ; Guo C; Yoshina S; Mitani S; Hu PJ
Abstract: FoxO transcription factors control development and longevity in diverse species. Although FoxO regulation via changes in its subcellular localization is well established, little is known about how FoxO activity is regulated in the nucleus. Here, we show that the conserved C. elegans protein EAK-7 acts in parallel to the serine/threonine kinase AKT-1 to inhibit the FoxO transcription factor DAF-16. Loss of EAK-7 activity promotes diapause and longevity in a DAF-16/FoxO-dependent manner. Whereas akt-1 mutation activates DAF-16/FoxO by promoting its translocation from the cytoplasm to the nucleus, eak-7 mutation increases nuclear DAF-16/FoxO activity without influencing DAF-16/FoxO subcellular localization. Thus, EAK-7 and AKT-1 inhibit DAF-16/FoxO activity via distinct mechanisms. Our results implicate EAK-7 as a FoxO regulator and highlight the biological impact of a regulatory pathway that governs the activity of nuclear FoxO without altering its subcellular location.
Keywords: Animals; Caenorhabditis elegans; Caenorhabditis elegans Proteins/genetics/*metabolism; Carrier Proteins/genetics/*metabolism; Forkhead Transcription Factors/*metabolism; Longevity; Mutation; Proto-Oncogene Proteins c-akt/genetics/metabolism; RNA Interference; Transcription Factors/*metabolism|
Journal: Cell metabolism Volume: 12 Issue: 1 Pages: 30-41 Date: July 14, 2010 PMID: 20620993 |
Alam H, Williams TW, Dumas KJ, Guo C, Yoshina S, Mitani S, Hu PJ (2010) EAK-7 controls development and life span by regulating nuclear DAF-16/FoxO activity. Cell metabolism 12: 30-41.
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