Journal
JOURNAL OF CELL BIOLOGY
Volume 194, Issue 4, Pages 581-596Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201006089
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Funding
- Deutsche Forschungsgemeinschaft [Kr1143/5-3, Kr1143/7-1, SFB566/Z02, TRR81/B2]
- Excellence Cluster Cardio-Pulmonary System
- Landes-Offensive zur Entwicklung Wissenschaftlich-okonomischer Exzellenz/Universities of Giessen
- Marburg Lung Center program
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Cytokines and stress-inducing stimuli signal through c-Jun N-terminal kinase (JNK) using a diverse and only partially defined set of downstream effectors. In this paper, the decapping complex subunit DCP1a was identified as a novel JNK target. JNK phosphorylated DCP1a at residue S315 in vivo and in vitro and co-immunoprecipitated and colocalized with DCP1a in processing bodies (P bodies). Sustained JNK activation by several different inducers led to DCP1a dispersion from P bodies, whereas IL-1 treatment transiently increased P body number. Inhibition of TAK1-JNK signaling also affected the number and size of P bodies and the localization of DCP1a, Xrn1, and Edc4. Transcriptome analysis further identified a central role for DCP1a in IL-1-induced messenger ribonucleic acid (mRNA) expression. Phosphomimetic mutation of S315 stabilized IL-8 but not I. B. mRNA, whereas overexpressed DCP1a blocked IL-8 transcription and suppressed p65 NF-kappa B nuclear activity. Collectively, these data reveal DCP1a as a multifunctional regulator of mRNA expression and suggest a novel mechanism controlling the subcellular localization of DCP1a in response to stress or inflammatory stimuli.
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