Alice S Ryan1, Guoyan Li2, Charlene Hafer-Macko3, Frederick M Ivey3. 1. Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; GRECC, MERCE, Baltimore, Maryland. Electronic address: aryan@grecc.umaryland.edu. 2. Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; GRECC, MERCE, Baltimore, Maryland. 3. GRECC, MERCE, Baltimore, Maryland; Department of Neurology, University of Maryland School of Medicine, Baltimore, Maryland.
Abstract
BACKGROUND: Peroxisome proliferator-activated receptor (PPAR)-γ coactivator (PGC-1α) gene and Sirtuin-1 (SIRT-1) respond to physiological stimuli and regulate insulin resistance. Inflammatory markers tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), C-reactive protein (CRP), and the soluble forms of intracellular adhesion molecule (sICAM-1) and vascular CAM-1 (sVCAM-1) are associated with increased risk of diabetes and coronary heart disease. Resistive training (RT) reduces hyperinsulinemia and improves insulin action in chronic stroke. Yet, the molecular mechanisms for this are unknown. This study will determine the effects of RT on skeletal muscle PGC-1α and SIRT-1 mRNA expression and inflammatory and vascular markers. METHODS: Stroke survivors (50-76 years) underwent a fasting blood draw for measurement of TNF-α, IL-6, CRP, serum amyloid A, sICAM-1, sVCAM-1, and bilateral vastus lateralis biopsies before and after RT. Participants were also assessed using bilateral multislice thigh computed tomography scans from the knee to the hip, a total body scan by dual-energy X-ray absorptiometry, and 1-repetition maximum strength testing. Subjects performed 2 sets of 3 lower extremity RT exercises 3 times per week for 12 weeks. RESULTS: Bilateral leg press and leg extension strength increased ~30-50% with RT (P < .001). Body weight, total body fat mass, and fat-free mass did not change. Thigh muscle area and volume increased in both legs (P < .05). Nonparetic muscle PGC-1α mRNA expression increased 14% (P < .05) after RT and SIRT-1 mRNA decreased 24% (P < .05) and 31% (P < .01) in paretic and nonparetic muscles. There were no significant changes in plasma inflammation with training. DISCUSSION: RT in chronic stroke induces changes in key skeletal muscle regulators of metabolism, without effecting circulating inflammation. Published by Elsevier Inc.
BACKGROUND: Peroxisome proliferator-activated receptor (PPAR)-γ coactivator (PGC-1α) gene and Sirtuin-1 (SIRT-1) respond to physiological stimuli and regulate insulin resistance. Inflammatory markers tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), C-reactive protein (CRP), and the soluble forms of intracellular adhesion molecule (sICAM-1) and vascular CAM-1 (sVCAM-1) are associated with increased risk of diabetes and coronary heart disease. Resistive training (RT) reduces hyperinsulinemia and improves insulin action in chronic stroke. Yet, the molecular mechanisms for this are unknown. This study will determine the effects of RT on skeletal muscle PGC-1α and SIRT-1 mRNA expression and inflammatory and vascular markers. METHODS:Stroke survivors (50-76 years) underwent a fasting blood draw for measurement of TNF-α, IL-6, CRP, serum amyloid A, sICAM-1, sVCAM-1, and bilateral vastus lateralis biopsies before and after RT. Participants were also assessed using bilateral multislice thigh computed tomography scans from the knee to the hip, a total body scan by dual-energy X-ray absorptiometry, and 1-repetition maximum strength testing. Subjects performed 2 sets of 3 lower extremity RT exercises 3 times per week for 12 weeks. RESULTS: Bilateral leg press and leg extension strength increased ~30-50% with RT (P < .001). Body weight, total body fat mass, and fat-free mass did not change. Thigh muscle area and volume increased in both legs (P < .05). Nonparetic muscle PGC-1α mRNA expression increased 14% (P < .05) after RT and SIRT-1 mRNA decreased 24% (P < .05) and 31% (P < .01) in paretic and nonparetic muscles. There were no significant changes in plasma inflammation with training. DISCUSSION: RT in chronic stroke induces changes in key skeletal muscle regulators of metabolism, without effecting circulating inflammation. Published by Elsevier Inc.
Authors: M Goto; S Terada; M Kato; M Katoh; T Yokozeki; I Tabata; T Shimokawa Journal: Biochem Biophys Res Commun Date: 2000-08-02 Impact factor: 3.575
Authors: Mi-Joung Lee; Sharon L Kilbreath; Maria Fiatarone Singh; Brian Zeman; Glen M Davis Journal: Med Sci Sports Exerc Date: 2010-01 Impact factor: 5.411
Authors: Aaron P Russell; Jonas Feilchenfeldt; Sylvia Schreiber; Manu Praz; Antoinette Crettenand; Charles Gobelet; Christoph A Meier; David R Bell; Anastasia Kralli; Jean-Paul Giacobino; Olivier Dériaz Journal: Diabetes Date: 2003-12 Impact factor: 9.461
Authors: Rong-Ze Yang; Jacob B Blumenthal; Nicole M Glynn; Mi-Jeong Lee; Andrew P Goldberg; Da-Wei Gong; Alice S Ryan Journal: Obesity (Silver Spring) Date: 2013-12-06 Impact factor: 5.002
Authors: Nigel K Stepto; Boubacar Benziane; Glenn D Wadley; Alexander V Chibalin; Benedict J Canny; Nir Eynon; Glenn K McConell Journal: PLoS One Date: 2012-12-28 Impact factor: 3.240
Authors: Renata Ferrari; Laura M O Caram; Marcia M Faganello; Fernanda F Sanchez; Suzana E Tanni; Irma Godoy Journal: Int J Chron Obstruct Pulmon Dis Date: 2015-08-06