title: Knockdown of Indy/CeNac2 extends Caenorhabditis elegans life span by inducing AMPK/aak-2.
abstract: Reducing the expression of the Indy (Acronym for 'I'm Not Dead, Yet') gene in lower organisms promotes longevity and leads to a phenotype that resembles various aspects of caloric restriction. In C. elegans, the available data on life span extension is controversial. Therefore, the aim of this study was to determine the role of the C. elegans INDY homolog CeNAC2 in life span regulation and to delineate possible molecular mechanisms. siRNA against Indy/CeNAC2 was used to reduce expression of Indy/CeNAC2. Mean life span was assessed in four independent experiments, as well as whole body fat content and AMPK activation. Moreover, the effect of Indy/CeNAC2 knockdown in C. elegans with inactivating variants of AMPK (TG38) was studied. Knockdown of Indy/CeNAC2 increased life span by 22±3 % compared to control siRNA treated C. elegans, together with a decrease in whole body fat content by ~50%. Indy/CeNAC2 reduction also increased the activation of the intracellular energy sensor AMPK/aak2. In worms without functional AMPK/aak2, life span was not extended when Indy/CeNAC2 was reduced. Inhibition of glycolysis with deoxyglucose, an intervention known to increase AMPK/aak2 activity and life span, did not promote longevity when Indy/CeNAC2 was knocked down. Together, these data indicate that reducing the expression of Indy/CeNAC2 increases life span in C. elegans, an effect mediated at least in part by AMPK/aak2.
authors: Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité - University School of Medicine, Berlin, Germany.
authors: Franziska
authors: F
authors: Schwarz
authors: Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité - University School of Medicine, Berlin, Germany.
authors: Zehra
authors: Z
authors: Karadeniz
authors: Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité - University School of Medicine, Berlin, Germany.
authors: Antje
authors: A
authors: Fischer-Rosinsky
authors: Section of Metabolic Vascular Medicine, Medical Clinic III and Paul Langerhans Institute Dresden (PLID), a member of the German Diabetes Center (DZD), Technische Universität Dresden, Germany.
authors: Diana M
authors: DM
authors: Willmes
authors: Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité - University School of Medicine, Berlin, Germany.
authors: Joachim
authors: J
authors: Spranger
authors: Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité - University School of Medicine, Berlin, Germany.|Section of Metabolic Vascular Medicine, Medical Clinic III and Paul Langerhans Institute Dresden (PLID), a member of the German Diabetes Center (DZD), Technische Universität Dresden, Germany.|Section of Diabetes and Nutritional Sciences, Rayne Institute, King's College London, UK.
authors: Andreas L
authors: AL
authors: Birkenfeld
mesh_terms: D055372:AMP-Activated Protein Kinases; D000273:Adipose Tissue; D000818:Animals; D017173:Caenorhabditis elegans / Q000201:enzymology* / Q000235:genetics; D029742:Caenorhabditis elegans Proteins / Q000235:genetics* / Q000378:metabolism*; D031204:Caloric Restriction; D004789:Enzyme Activation; D055785:Gene Knockdown Techniques; D005947:Glucose; D008136:Longevity; D027361:Organic Anion Transporters / Q000235:genetics*; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*
chemical_list: D029742:Caenorhabditis elegans Proteins; C487723:NAC-2 protein, C elegans; D027361:Organic Anion Transporters; D017346:Protein Serine-Threonine Kinases; C510541:AAK-2 protein, C elegans; D055372:AMP-Activated Protein Kinases; D005947:Glucose
keywords: AMPK; C.elegans; CeNAC-2; Indy; Slc13A5; aak-2; mIndy