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Research Paper|Volume 7, Issue 8|pp 553—567

Knockdown of Indy/CeNac2 extends Caenorhabditis elegans life span by inducing AMPK/aak-2

Franziska Schwarz1, Zehra Karadeniz1, Antje Fischer-Rosinsky1, Diana M Willmes2, Joachim Spranger1, Andreas L Birkenfeld1,2,3
  • 1Department of Endocrinology, Diabetes and Nutrition, Center for Cardiovascular Research, Charité – University School of Medicine, Berlin, Germany
  • 2Section 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
  • 3Section of Diabetes and Nutritional Sciences, Rayne Institute, King's College London, UK
Received: June 1, 2015Accepted: August 11, 2015Published: August 20, 2015
https://doi.org/10.18632/aging.100791

Copyright: © 2015 Schwarz et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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