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Publication Detail
A Role for p38 Stress-Activated Protein Kinase in Regulation of Cell Growth via TORC1
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Cully M, Genevet A, Warne P, Treins C, Liu T, Bastien J, Baum B, Tapon N, Leevers SJ, Downward J
  • Publisher:
    AMER SOC MICROBIOLOGY
  • Publication date:
    15/01/2010
  • Pagination:
    481, 495
  • Journal:
    MOL CELL BIOL
  • Volume:
    30
  • Issue:
    2
  • Print ISSN:
    0270-7306
  • Language:
    EN
  • Keywords:
    TUBEROUS SCLEROSIS COMPLEX, TUMOR-SUPPRESSOR COMPLEX, TSC2 GAP ACTIVITY, P70 S6 KINASE, MAMMALIAN TARGET, AMINO-ACIDS, MTOR PATHWAY, MAP KINASE, CYCLE ARREST, RAG GTPASES
  • Addresses:
    Downward, J
    London Res Inst
    Signal Transduct Lab
    London
    WC2A 3PX
    England
Abstract
The target of rapamycin (TOR) complex 1 (TORC1) signaling pathway is a critical regulator of translation and cell growth. To identify novel components of this pathway, we performed a kinome-wide RNA interference (RNAi) screen in Drosophila melanogaster S2 cells. RNAi targeting components of the p38 stress-activated kinase cascade prevented the cell size increase elicited by depletion of the TOR negative regulator TSC2. In mammalian and Drosophila tissue culture, as well as in Drosophila ovaries ex vivo, p38-activating stresses, such as H2O2 and anisomycin, were able to activate TORC1. This stress-induced TORC1 activation could be blocked by RNAi against mitogen-activated protein kinase kinase 3 and 6 (MKK3/6) or by the overexpression of dominant negative Rags. Interestingly, p38 was also required for the activation of TORC1 in response to amino acids and growth factors. Genetic ablation either of p38b or licorne, its upstream kinase, resulted in small flies consisting of small cells. Mutants with mutations in licorne or p38b are nutrition sensitive; low-nutrient food accentuates the small-organism phenotypes, as well as the partial lethality of the p38b null allele. These data suggest that p38 is an important positive regulator of TORC1 in both mammalian and Drosophila systems in response to certain stresses and growth factors.
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