fphys-10-00474 April 30, 2019 Time: 17:15 # 1 ORIGINAL RESEARCH published: 01 May 2019 doi: 10.3389/fphys.2019.00474 Mitochondrial Adaptations in Elderly and Young Men Skeletal Muscle Following 2 Weeks of Bed Rest and Rehabilitation Alessia Buso1†, Marina Comelli1†, Raffaella Picco1, Miriam Isola1, Benedetta Magnesa1, Rado Pišot2, Joern Rittweger3,4, Desy Salvadego1, Boštjan Šimunicˇ 2, Bruno Grassi1,5 and Irene Mavelli1,6* 1 Department of Medicine, University of Udine, Udine, Italy, 2 Institute for Kinesiology Research, Science and Research Centre, Koper, Slovenia, 3 Department of Pediatrics and Adolescent Medicine, University of Cologne, Cologne, Germany, 4 Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany, 5 Institute of Bioimaging and Molecular Physiology, National Research Council, Milan, Italy, 6 INBB Istituto Nazionale Biostrutture e Biosistemi, Rome, Italy Edited by: Pier Giorgio Mastroberardino, Erasmus University Rotterdam, The aim of the study was to evaluate the expression levels of proteins related Netherlands to mitochondrial biogenesis regulation and bioenergetics in vastus lateralis muscle Reviewed by: biopsies from 16 elderly and 7 young people subjected to 14 days of bed-rest, David Thomson, Brigham Young University, causing atrophy, and subsequent 14 days of exercise training. Based on quantitative United States immunoblot analyses, in both groups a reduction of two key regulators of mitochondrial Borja Guerra, Universidad de Las Palmas de Gran biogenesis/remodeling and activity, namely PGC-1a and Sirt3, was revealed during bed- Canaria, Spain rest, with a subsequent up-regulation after rehabilitation, indicating an involvement of *Correspondence: PGC-1a-Sirt3 axis in response to the treatments. A difference was observed comparing Irene Mavelli the young and elderly subjects as, for both proteins, the abundance in the elderly
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