A novel role for the SMG-1 kinase in lifespan and oxidative stress resistance in Caenorhabditis elegans.

Authors: Masse I; Molin L; Mouchiroud L; Vanhems P; Palladino F; Billaud M; Solari F

Abstract: The PTEN tumour suppressor encodes a phosphatase, and its daf-18 orthologue in Caenorhabditis elegans negatively regulates the insulin/IGF-1 DAF-2 receptor pathway that influences lifespan in worms and other species. In order to identify new DAF-18 regulated pathways involved in aging, we initiated a candidate RNAi feeding screen for clones that lengthen lifespan. Here, we report that smg-1 inactivation increases average lifespan in a daf-18 dependent manner. Genetic analysis is consistent with SMG-1 acting at least in part in parallel to the canonical DAF-2 receptor pathway, but converging on the transcription factor DAF-16/FOXO. SMG-1 is a serine-threonine kinase which plays a conserved role in nonsense-mediated mRNA decay (NMD) in worms and mammals. In addition, human SMG-1 has also been implicated in the p53-mediated response to genotoxic stress. The effect of smg-1 inactivation on lifespan appears to be unrelated to its NMD function, but requires the p53 tumour suppressor orthologue cep-1. Furthermore, smg-1 inactivation confers a resistance to oxidative stress in a daf-18-, daf-16- and cep-1-dependent manner. We propose that the role of SMG-1 in lifespan regulation is at least partly dependent on its function in oxidative stress resistance. Taken together, our results unveil a novel role for SMG-1 in lifespan regulation.

Keywords: Animals; Caenorhabditis elegans/*genetics/metabolism/*physiology; Caenorhabditis elegans Proteins/genetics/metabolism/*physiology; *Genes, Helminth; Longevity/*genetics/physiology; Oxidative Stress/*genetics/physiology; Protein Kinases/genetics/metabolism/*physiology; RNA Interference
Journal: PloS one
Volume: 3
Issue: 10
Pages: e3354
Date: Oct. 7, 2008
PMID: 18836529
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Masse I, Molin L, Mouchiroud L, Vanhems P, Palladino F, Billaud M, Solari F (2008) A novel role for the SMG-1 kinase in lifespan and oxidative stress resistance in Caenorhabditis elegans. PloS one 3: e3354.

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