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Quiroga C, Mancilla G, Oyarzun I, Tapia A, Caballero M, Gabrielli LA, Valladares-Ide D, del Campo A, Castro PF, Verdejo HE. Moderate Exercise in Spontaneously Hypertensive Rats Is Unable to Activate the Expression of Genes Linked to Mitochondrial Dynamics and Biogenesis in Cardiomyocytes. Front Endocrinol (Lausanne) 2020; 11:546. [PMID: 32973679 PMCID: PMC7466645 DOI: 10.3389/fendo.2020.00546] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 07/06/2020] [Indexed: 01/13/2023] Open
Abstract
Hypertension (HTN) is a public health concern and a major preventable cause of cardiovascular disease (CVD). When uncontrolled, HTN may lead to adverse cardiac remodeling, left ventricular hypertrophy, and ultimately, heart failure. Regular aerobic exercise training exhibits blood pressure protective effects, improves myocardial function, and may reverse pathologic cardiac hypertrophy. These beneficial effects depend at least partially on improved mitochondrial function, decreased oxidative stress, endothelial dysfunction, and apoptotic cell death, which supports the general recommendation of moderate exercise in CVD patients. However, most of these mechanisms have been described on healthy individuals; the effect of moderate exercise on HTN subjects at a cellular level remain largely unknown. We hypothesized that hypertension in adult spontaneously hypertensive rats (SHRs) reduces the mitochondrial response to moderate exercise in the myocardium. Methods: Eight-month-old SHRs and their normotensive control-Wistar-Kyoto rats (WKYR)-were randomly assigned to moderate exercise on a treadmill five times per week with a running speed set at 10 m/min and 15° inclination. The duration of each session was 45 min with a relative intensity of 70-85% of the maximum O2 consumption for a total of 8 weeks. A control group of untrained animals was maintained in their cages with short sessions of 10 min at 10 m/min two times per week to maintain them accustomed to the treadmill. After completing the exercise protocol, we assessed maximum exercise capacity and echocardiographic parameters. Animals were euthanized, and heart and muscle tissue were harvested for protein determinations and gene expression analysis. Measurements were compared using a nonparametric ANOVA (Kruskal-Wallis), with post-hoc Dunn's test. Results: At baseline, SHR presented myocardial remodeling evidenced by left ventricular hypertrophy (interventricular septum 2.08 ± 0.07 vs. 1.62 ± 0.08 mm, p < 0.001), enlarged left atria (0.62 ± 0.1 mm vs. 0.52 ± 0.1, p = 0.04), and impaired diastolic function (E/A ratio 2.43 ± 0.1 vs. 1.56 ± 0.2) when compared to WKYR. Moderate exercise did not induce changes in ventricular remodeling but improved diastolic filling pattern (E/A ratio 2.43 ± 0.1 in untrained SHR vs. 1.89 ± 0.16 trained SHR, p < 0.01). Histological analysis revealed increased myocyte transversal section area, increased Myh7 (myosin heavy chain 7) expression, and collagen fiber accumulation in SHR-control hearts. While the exercise protocol did not modify cardiac size, there was a significant reduction of cardiomyocyte size in the SHR-exercise group. Conversely, titin expression increased only WYK-exercise animals but remained unchanged in the SHR-exercise group. Mitochondrial response to exercise also diverged between SHR and WYKR: while moderate exercise showed an apparent increase in mRNA levels of Ppargc1α, Opa1, Mfn2, Mff, and Drp1 in WYKR, mitochondrial dynamics proteins remained unchanged in response to exercise in SHR. This finding was further confirmed by decreased levels of MFN2 and OPA1 in SHR at baseline and increased OPA1 processing in response to exercise in heart. In summary, aerobic exercise improves diastolic parameters in SHR but fails to activate the cardiomyocyte mitochondrial adaptive response observed in healthy individuals. This finding may explain the discrepancies on the effect of exercise in clinical settings and evidence of the need to further refine our understanding of the molecular response to physical activity in HTN subjects.
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Affiliation(s)
- Clara Quiroga
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDIS), Santiago, Chile
| | - Georthan Mancilla
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Ingrid Oyarzun
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Anita Tapia
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Mia Caballero
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Luigi A. Gabrielli
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDIS), Santiago, Chile
| | | | - Andrea del Campo
- Laboratorio de Fisiología y Bioenergética Celular, Departamento de Farmacia, Facultad de Química y de Farmacia, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Pablo F. Castro
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDIS), Santiago, Chile
| | - Hugo E. Verdejo
- Laboratorio de Señalización Cardiovascular, División de Enfermedades Cardiovasculares, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
- Advanced Center for Chronic Diseases (ACCDIS), Santiago, Chile
- *Correspondence: Hugo E. Verdejo
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Hwang PS, Machek SB, Cardaci TD, Wilburn DT, Kim CS, Suezaki ES, Willoughby DS. Effects of Pyrroloquinoline Quinone (PQQ) Supplementation on Aerobic Exercise Performance and Indices of Mitochondrial Biogenesis in Untrained Men. J Am Coll Nutr 2019; 39:547-556. [PMID: 31860387 DOI: 10.1080/07315724.2019.1705203] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Objective: Pyrroloquinoline quinone (PQQ) is a novel supplement involved in processes such as mitochondrial biogenesis and cellular energy metabolism. Since endurance exercise and PQQ exhibit similar mechanisms for mitochondrial biogenesis, it is plausible that PQQ may have ergogenic value. Therefore, the purpose of this study was to examine the effects of a six-week endurance exercise training program on mitochondrial biogenesis and aerobic performance in non-endurance-trained males.Methods: Twenty-three males were randomized to consume 20 mg/day of PQQ or placebo (PLC). Both groups followed a supervised six-week endurance exercise training program. Body composition was assessed by dual-energy-x-ray-absorptiometry (DEXA). Aerobic exercise performance and peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α), a biochemical marker for mitochondrial biogenesis, were assessed before and after the six-week endurance training/supplementation program.Results: There were no significant differences between groups in aerobic performance after endurance-training (p > 0.05). However, there were significant improvements in peak oxygen consumption (VO2peak) and total exercise test duration after endurance-training, irrespective of group (p < 0.05). The PQQ group had a significant increase in PGC-1α protein levels from baseline to post endurance training compared to PLC (p < 0.05). Furthermore, the PQQ group had higher PGC-1α protein levels after 6 weeks of endurance training compared to PLC (p < 0.05).Conclusions: Supplementation of PQQ does not appear to elicit any ergogenic effects regarding aerobic performance or body composition but appears to impact mitochondrial biogenesis by way of significant elevations in PGC-1α protein content.
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Affiliation(s)
- Paul S Hwang
- Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas, USA
| | - Steven B Machek
- Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas, USA
| | - Thomas D Cardaci
- Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas, USA
| | - Dylan T Wilburn
- Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas, USA
| | - Caelin S Kim
- Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas, USA
| | - Emiliya S Suezaki
- Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas, USA
| | - Darryn S Willoughby
- Department of Health, Human Performance, and Recreation, Exercise and Biochemical Nutrition Laboratory, Baylor University, Waco, Texas, USA
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Preobrazenski N, Islam H, Drouin PJ, Bonafiglia JT, Tschakovsky ME, Gurd BJ. A novel gravity-induced blood flow restriction model augments ACC phosphorylation and PGC-1α mRNA in human skeletal muscle following aerobic exercise: a randomized crossover study. Appl Physiol Nutr Metab 2019; 45:641-649. [PMID: 31778310 DOI: 10.1139/apnm-2019-0641] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
This study tested the hypothesis that a novel, gravity-induced blood flow restricted (BFR) aerobic exercise (AE) model will result in greater activation of the AMPK-PGC-1α pathway compared with work rate-matched non-BFR. Thirteen healthy males (age: 22.4 ± 3.0 years; peak oxygen uptake: 42.4 ± 7.3 mL/(kg·min)) completed two 30-min work rate-matched bouts of cycling performed with their legs below (CTL) and above their heart (BFR) at ∼2 weeks apart. Muscle biopsies were taken before, immediately, and 3 h after exercise. Blood was drawn before and immediately after exercise. Our novel gravity-induced BFR model led to less muscle oxygenation during BFR compared with CTL (O2Hb: p = 0.01; HHb: p < 0.01) and no difference in muscle activation (p = 0.53). Plasma epinephrine increased following both BFR and CTL (p < 0.01); however, only norepinephrine increased more following BFR (p < 0.01). PGC-1α messenger RNA (mRNA) increased more following BFR (∼6-fold) compared with CTL (∼4-fold; p = 0.036). VEGFA mRNA increased (p < 0.01) similarly following BFR and CTL (p = 0.21), and HIF-1α mRNA did not increase following either condition (p = 0.21). Phosphorylated acetyl-coenzyme A carboxylase (ACC) increased more following BFR (p < 0.035) whereas p-PKA substrates, p-p38 MAPK, and acetyl-p53 increased (p < 0.05) similarly following both conditions (p > 0.05). In conclusion, gravity-induced BFR is a viable BFR model that demonstrated an important role of AMPK signalling on augmenting PGC-1α mRNA. Novelty Gravity-induced BFR AE reduced muscle oxygenation without impacting muscle activation, advancing gravity-induced BFR as a simple, inexpensive BFR model. Gravity-induced BFR increased PGC-1α mRNA and ACC phosphorylation more than work rate-matched non-BFR AE. This is the first BFR AE study to concurrently measure blood catecholamines, muscle activation, and muscle oxygenation.
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Affiliation(s)
- Nicholas Preobrazenski
- School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada.,School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada
| | - Hashim Islam
- School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada.,School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada
| | - Patrick J Drouin
- School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada.,School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada
| | - Jacob T Bonafiglia
- School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada.,School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada
| | - Michael E Tschakovsky
- School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada.,School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada
| | - Brendon J Gurd
- School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada.,School of Kinesiology and Health Studies, Queen's University, 28 Division Street, Kingston, ON K7L 3N6, Canada
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The impact of acute and chronic exercise on Nrf2 expression in relation to markers of mitochondrial biogenesis in human skeletal muscle. Eur J Appl Physiol 2019; 120:149-160. [PMID: 31707475 DOI: 10.1007/s00421-019-04259-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 11/01/2019] [Indexed: 10/25/2022]
Abstract
PURPOSE To examine the relationship between changes in nuclear factor erythroid 2-related factor 2 (Nrf2) expression and markers of mitochondrial biogenesis in acutely and chronically exercised human skeletal muscle. METHODS The impact of acute submaximal endurance (END) and supramaximal interval (Tabata) cycling on the upregulation of Nrf2 (and its downstream targets), nuclear respiratory factor-1 (NRF-1) and mitochondrial transcription factor A (TFAM) mRNA expression was examined in healthy young males (n = 10). The relationship between changes in citrate synthase (CS) maximal activity and the protein content of Nrf2, heme oxygenase 1 (HO-1), NRF-1, and TFAM was also investigated following 4 weeks of Tabata in a separate group of males (n = 21). RESULTS Nrf2, NRF-1, and HO-1 mRNA expression increased after acute exercise (p < 0.05), whereas the increase in superoxide dismutase 2 (SOD2) mRNA expression approached significance (p = 0.08). Four weeks of Tabata increased CS activity and Nrf2, NRF-1, and TFAM protein content (p < 0.05), but decreased HO-1 protein content (p < 0.05). Training-induced changes in Nrf2 protein were strongly correlated with NRF-1 (r = 0.63, p < 0.01). When comparing protein content changes between individuals with the largest (HI: + 23%) and smallest (LO: - 1%) observed changes in CS activity (n = 8 each), increases in Nrf2 and TFAM protein content were apparent in the HI group only (p < 0.02) with medium-to-large effect sizes for between-group differences in changes in Nrf2 (ηp2=0.15) and TFAM (ηp2 = 0.12) protein content. CONCLUSION Altogether, our findings support a potential role for Nrf2 in exercise-induced mitochondrial biogenesis in human skeletal muscle.
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Radhakrishnan J, Baetiong A, Kaufman H, Huynh M, Leschinsky A, Fresquez A, White C, DiMario JX, Gazmuri RJ. Improved exercise capacity in cyclophilin-D knockout mice associated with enhanced oxygen utilization efficiency and augmented glucose uptake via AMPK-TBC1D1 signaling nexus. FASEB J 2019; 33:11443-11457. [PMID: 31339770 DOI: 10.1096/fj.201802238r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We previously reported in HEK 293T cells that silencing the mitochondrial peptidyl prolyl isomerase cyclophilin-D (Cyp-D) reduces Vo2. We now report that in vivo Cyp-D ablation using constitutive Cyp-D knockout (KO) mice also reduces Vo2 both at rest (∼15%) and during treadmill exercise (∼12%). Yet, despite Vo2 reduction, these Cyp-D KO mice ran longer (1071 ± 77 vs. 785 ± 79 m; P = 0.002), for longer time (43 ± 3 vs. 34 ± 3 min; P = 0.004), and at higher speed (34 ± 1 vs. 29 ± 1 m/s; P ≤ 0.001), resulting in increased work (87 ± 6 vs. 58 ± 6 J; P ≤ 0.001). There were parallel reductions in carbon dioxide production, but of lesser magnitude, yielding a 2.3% increase in the respiratory exchange ratio consistent with increased glucose utilization as respiratory substrate. In addition, primary skeletal muscle cells of Cyp-D KO mice subjected to electrical stimulation exhibited higher glucose uptake (4.4 ± 0.55 vs. 2.6 ± 0.04 pmol/mg/min; P ≤ 0.001) with enhanced AMPK activation (0.58 ± 0.06 vs. 0.38 ± 0.03 pAMPK/β-tubulin ratio; P ≤ 0.01) and TBC1 (Tre-2/USP6, BUB2, Cdc16) domain family, member 1 (TBC1D1) inactivation. Likewise, pharmacological activation of AMPK also increased glucose uptake (3.2 ± 0.3 vs. 2.3 ± 0.2 pmol/mg/min; P ≤ 0.001). Moreover, lactate and ATP levels were increased in these cells. Taken together, Cyp-D ablation triggered an adaptive response resulting in increased exercise capacity despite less oxygen utilization associated with increased glucose uptake and utilization involving AMPK-TBC1D1 signaling nexus.-Radhakrishnan, J., Baetiong, A., Kaufman, H., Huynh, M., Leschinsky, A., Fresquez, A., White, C., DiMario, J. X., Gazmuri, R. J. Improved exercise capacity in cyclophilin-D knockout mice associated with enhanced oxygen utilization efficiency and augmented glucose uptake via AMPK-TBC1D1 signaling nexus.
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Affiliation(s)
- Jeejabai Radhakrishnan
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
- Department of Clinical Sciences, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Alvin Baetiong
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Harrison Kaufman
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Michelle Huynh
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Angela Leschinsky
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Adriana Fresquez
- Discipline of Physiology and Biophysics, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
- Center for Cancer Cell Biology, Immunology, and Infection, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
- School of Graduate and Postdoctoral Studies, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Carl White
- Discipline of Physiology and Biophysics, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
- Center for Cancer Cell Biology, Immunology, and Infection, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Joseph X DiMario
- School of Graduate and Postdoctoral Studies, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
- Department of Biomedical Research, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
| | - Raúl J Gazmuri
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
- Department of Clinical Sciences, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA
- Captain James A. Lovell Federal Health Care Center, North Chicago, Illinois, USA
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Tyganov SA, Mochalova EP, Belova SP, Sharlo KA, Rozhkov SV, Vilchinskaya NA, Paramonova II, Mirzoev TM, Shenkman BS. Effects of Plantar Mechanical Stimulation on Anabolic and Catabolic Signaling in Rat Postural Muscle Under Short-Term Simulated Gravitational Unloading. Front Physiol 2019; 10:1252. [PMID: 31611819 PMCID: PMC6776874 DOI: 10.3389/fphys.2019.01252] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Accepted: 09/12/2019] [Indexed: 12/18/2022] Open
Abstract
It is known that plantar mechanical stimulation (PMS) is able to attenuate unloading-induced skeletal muscle atrophy and impaired muscle function. However, molecular mechanisms underlying the effect of PMS on skeletal muscle during unloading remain undefined. The aim of the study was to evaluate the effects of PMS on anabolic and catabolic signaling pathways in rat soleus at the early stages of mechanical unloading. Wistar rats were randomly assigned to ambulatory control, hindlimb suspension (HS) for 1 or 3 days, and HS for 1 or 3 days with PMS. The key anabolic and catabolic markers were assessed by western blotting and RT-PCR. Protein synthesis (PS) rate was estimated using SUnSET technique. PMS attenuated a 1-day HS-induced decrease in 4E-BP1, GSK-3β, and AMPK phosphorylation. PMS also partially prevented a decrease in PS, phosphorylation of GSK-3β, nNOS, and an increase in eEF2 phosphorylation after 3-day HS. PMS during 1- and 3-day HS prevented MuRF-1, but not MAFbx, upregulation but did not affect markers of ribosome biogenesis (18S + 28S rRNA, c-myc) as well as AKT phosphorylation. Thus, PMS during 3-day HS partially prevented a decrease in the global rate of PS in rat soleus muscle, which was accompanied by attenuation of MuRF-1 mRNA expression as well as changes in GSK-3β, nNOS, and eEF2 phosphorylation.
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Affiliation(s)
- Sergey A Tyganov
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Ekaterina P Mochalova
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Svetlana P Belova
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Kristina A Sharlo
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Sergey V Rozhkov
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Natalia A Vilchinskaya
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Inna I Paramonova
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Timur M Mirzoev
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
| | - Boris S Shenkman
- Myology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia
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Kanazashi M, Tanaka M, Nakanishi R, Maeshige N, Fujino H. Effects of astaxanthin supplementation and electrical stimulation on muscle atrophy and decreased oxidative capacity in soleus muscle during hindlimb unloading in rats. J Physiol Sci 2019; 69:757-767. [PMID: 31273678 PMCID: PMC10717927 DOI: 10.1007/s12576-019-00692-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Accepted: 06/24/2019] [Indexed: 12/15/2022]
Abstract
The effects of a combination of the antioxidant astaxanthin (AX) and electrical stimulation (ES) on muscle mass and mitochondrial oxidative capacity were investigated in the soleus muscle of hindlimb unloaded rats. Five groups of male Sprague-Dawley rats were used; control, 1-week hindlimb unloading (HU), HU + AX, HU + ES, and HU + AX + ES. Respective rats in the AX groups received 50-mg/kg AX twice daily during HU. Calf muscles of rats in the ES groups were electrically stimulated for 240 s/day during HU. One-week HU decreased muscle mass along with decreased FoxO3a phosphorylation and increased ubiquitinated proteins expressions, decreased oxidative enzymatic activity accompanied with decline in PGC-1α protein expression, and increased reactive oxygen species production. However, the combination treatment could synergistically attenuate/suppress all HU-related changes, suggesting protective effects on muscle atrophy and decreased muscle oxidative capacity due to chronic neuromuscular inactivity.
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Affiliation(s)
- Miho Kanazashi
- Department of Physical Therapy, Faculty of Health and Welfare, Prefectural University of Hiroshima, 1-1 Gakuen-cho, Mihara-shi, Hiroshima, 723-0053, Japan
| | - Masayuki Tanaka
- Department of Physical Therapy, Faculty of Human Sciences, Osaka University of Human Sciences, 1-4-1 Shojaku, Settsu-shi, Osaka, 566-8501, Japan
| | - Ryosuke Nakanishi
- Department of Physical Therapy, Faculty of Rehabilitation, Kobe International University, 9-1-6 Koyocho-naka, Higashinada-ku, Kobe-shi, Hyogo, 658-0032, Japan
| | - Noriaki Maeshige
- Department of Rehabilitation Science, Kobe University Graduate School of Health Sciences, 7-10-2 Tomogaoka, Suma-ku, Kobe-shi, Hyogo, 654-0142, Japan
| | - Hidemi Fujino
- Department of Rehabilitation Science, Kobe University Graduate School of Health Sciences, 7-10-2 Tomogaoka, Suma-ku, Kobe-shi, Hyogo, 654-0142, Japan.
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Abstract
Neurological and mental illnesses account for a considerable proportion of the global burden of disease. Exercise has many beneficial effects on brain health, contributing to decreased risks of dementia, depression and stress, and it has a role in restoring and maintaining cognitive function and metabolic control. The fact that exercise is sensed by the brain suggests that muscle-induced peripheral factors enable direct crosstalk between muscle and brain function. Muscle secretes myokines that contribute to the regulation of hippocampal function. Evidence is accumulating that the myokine cathepsin B passes through the blood-brain barrier to enhance brain-derived neurotrophic factor production and hence neurogenesis, memory and learning. Exercise increases neuronal gene expression of FNDC5 (which encodes the PGC1α-dependent myokine FNDC5), which can likewise contribute to increased brain-derived neurotrophic factor levels. Serum levels of the prototype myokine, IL-6, increase with exercise and might contribute to the suppression of central mechanisms of feeding. Exercise also increases the PGC1α-dependent muscular expression of kynurenine aminotransferase enzymes, which induces a beneficial shift in the balance between the neurotoxic kynurenine and the neuroprotective kynurenic acid, thereby reducing depression-like symptoms. Myokine signalling, other muscular factors and exercise-induced hepatokines and adipokines are implicated in mediating the exercise-induced beneficial impact on neurogenesis, cognitive function, appetite and metabolism, thus supporting the existence of a muscle-brain endocrine loop.
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Affiliation(s)
- Bente Klarlund Pedersen
- Centre of Inflammation and Metabolism (CIM) and Centre for Physical Activity Research (CFAS), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
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Islam H, Hood DA, Gurd BJ. Looking beyond PGC-1α: emerging regulators of exercise-induced skeletal muscle mitochondrial biogenesis and their activation by dietary compounds. Appl Physiol Nutr Metab 2019; 45:11-23. [PMID: 31158323 DOI: 10.1139/apnm-2019-0069] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Despite its widespread acceptance as the "master regulator" of mitochondrial biogenesis (i.e., the expansion of the mitochondrial reticulum), peroxisome proliferator-activated receptor (PPAR) gamma coactivator-1 alpha (PGC-1α) appears to be dispensable for the training-induced augmentation of skeletal muscle mitochondrial content and respiratory function. In fact, a number of regulatory proteins have emerged as important players in skeletal muscle mitochondrial biogenesis and many of these proteins share key attributes with PGC-1α. In an effort to move past the simplistic notion of a "master regulator" of mitochondrial biogenesis, we highlight the regulatory mechanisms by which nuclear factor erythroid 2-related factor 2 (Nrf2), estrogen-related receptor gamma (ERRγ), PPARβ, and leucine-rich pentatricopeptide repeat-containing protein (LRP130) may contribute to the control of skeletal muscle mitochondrial biogenesis. We also present evidence supporting/refuting the ability of sulforaphane, quercetin, and epicatechin to promote skeletal muscle mitochondrial biogenesis and their potential to augment mitochondrial training adaptations. Targeted activation of specific pathways by these compounds may allow for greater mechanistic insight into the molecular pathways controlling mitochondrial biogenesis in human skeletal muscle. Dietary activation of mitochondrial biogenesis may also be useful in clinical populations with basal reductions in mitochondrial protein content, enzyme activities, and/or respiratory function as well as individuals who exhibit a blunted skeletal muscle responsiveness to contractile activity. Novelty The existence of redundant pathways leading to mitochondrial biogenesis refutes the simplistic notion of a "master regulator" of mitochondrial biogenesis. Dietary activation of specific pathways may provide greater mechanistic insight into the exercise-induced mitochondrial biogenesis in human skeletal muscle.
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Affiliation(s)
- Hashim Islam
- School of Kinesiology and Health Studies, Queen's University, Kingston, ON K7L 3N6, Canada
| | - David A Hood
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, ON K7L 3N6, Canada
| | - Brendon J Gurd
- School of Kinesiology and Health Studies, Queen's University, Kingston, ON K7L 3N6, Canada
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Andreux PA, Blanco-Bose W, Ryu D, Burdet F, Ibberson M, Aebischer P, Auwerx J, Singh A, Rinsch C. The mitophagy activator urolithin A is safe and induces a molecular signature of improved mitochondrial and cellular health in humans. Nat Metab 2019; 1:595-603. [PMID: 32694802 DOI: 10.1038/s42255-019-0073-4] [Citation(s) in RCA: 281] [Impact Index Per Article: 56.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 05/03/2019] [Indexed: 12/19/2022]
Abstract
Urolithin A (UA) is a natural dietary, microflora-derived metabolite shown to stimulate mitophagy and improve muscle health in old animals and in preclinical models of aging1. Here, we report the results of a first-in-human clinical trial in which we administered UA, either as a single dose or as multiple doses over a 4-week period, to healthy, sedentary elderly individuals. We show that UA has a favourable safety profile (primary outcome). UA was bioavailable in plasma at all doses tested, and 4 weeks of treatment with UA at doses of 500 mg and 1,000 mg modulated plasma acylcarnitines and skeletal muscle mitochondrial gene expression in elderly individuals (secondary outcomes). These observed effects on mitochondrial biomarkers show that UA induces a molecular signature of improved mitochondrial and cellular health following regular oral consumption in humans.
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Affiliation(s)
| | | | - Dongryeol Ryu
- Amazentis SA, EPFL Innovation Park, Bâtiment C, Lausanne, Switzerland
- Laboratory for Integrative and Systems Physiology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon, Republic of Korea
| | - Frédéric Burdet
- Vital-IT Group, SIB Swiss Institute of Bioinformatics, Quartier Sorge, Bâtiment Génopode, Lausanne, Switzerland
| | - Mark Ibberson
- Vital-IT Group, SIB Swiss Institute of Bioinformatics, Quartier Sorge, Bâtiment Génopode, Lausanne, Switzerland
| | - Patrick Aebischer
- Neurodegenerative Diseases Laboratory, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Johan Auwerx
- Laboratory for Integrative and Systems Physiology, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Anurag Singh
- Amazentis SA, EPFL Innovation Park, Bâtiment C, Lausanne, Switzerland
| | - Chris Rinsch
- Amazentis SA, EPFL Innovation Park, Bâtiment C, Lausanne, Switzerland.
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Falz R, Fikenzer S, Holzer R, Laufs U, Fikenzer K, Busse M. Acute cardiopulmonary responses to strength training, high-intensity interval training and moderate-intensity continuous training. Eur J Appl Physiol 2019; 119:1513-1523. [PMID: 30963239 DOI: 10.1007/s00421-019-04138-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Accepted: 04/03/2019] [Indexed: 12/17/2022]
Abstract
PURPOSE Long-term effects of exercise training are well studied. Acute hemodynamic responses to various training modalities, in particularly strength training (ST), have only been described in a few studies. This study examines the acute responses to ST, high-intensity interval training (HIIT) and moderate-intensity continuous training (MCT). METHODS Twelve young male subjects (age 23.4 ± 2.6 years; BMI 23.7 ± 1.5 kg/m2) performed an incremental exertion test and were randomized into HIIT (4 × 4-min intervals), MCT (continuous cycling) and ST (five body-weight exercises) which were matched for training duration. The cardiopulmonary (impedance cardiography, ergo-spirometry) and metabolic response were monitored. RESULTS Similar peak blood lactate responses were observed after HIIT and ST (8.5 ± 2.6 and 8.1 ± 1.2 mmol/l, respectively; p = 0.83). The training impact time was 90.7 ± 8.5% for HIIT and 68.2 ± 8.5% for MCT (p < 0.0001). The mean cardiac output was significantly higher for HIIT compared to that of MCT and ST (23.2 ± 4.1 vs. 20.9 ± 2.9 vs. 12.9 ± 2.9 l/min, respectively; p < 0.0001). VO2max was twofold higher during HIIT compared to that observed during ST (2529 ± 310 vs. 1290 ± 156 ml; p = 0.0004). Among the components of ST, squats compared with push-ups resulted in different heart rate (111 ± 13.5 vs. 125 ± 15.7 bpm, respectively; p < 0.05) and stroke volume (125 ± 23.3 vs. 104 ± 19.8 ml, respectively; p < 0.05). CONCLUSIONS Despite an equal training duration and a similar acute metabolic response, large differences with regard to the training impact time and the cardiopulmonary response give evident. HIIT and MCT, but less ST, induced a sufficient cardiopulmonary response, which is important for the preventive effects of training; however, large differences in intensity were apparent for ST.
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Affiliation(s)
- Roberto Falz
- Institute of Sport Medicine and Prevention, University of Leipzig, Marschnerstraße 29a, 04109, Leipzig, Germany.
| | - Sven Fikenzer
- Medical Department IV-Cardiology, University of Leipzig Medical Center, Liebigstr. 20, 04103, Leipzig, Germany
| | - Roman Holzer
- Institute of Sport Medicine and Prevention, University of Leipzig, Marschnerstraße 29a, 04109, Leipzig, Germany
| | - Ulrich Laufs
- Medical Department IV-Cardiology, University of Leipzig Medical Center, Liebigstr. 20, 04103, Leipzig, Germany
| | - Kati Fikenzer
- Medical Department IV-Cardiology, University of Leipzig Medical Center, Liebigstr. 20, 04103, Leipzig, Germany
| | - Martin Busse
- Institute of Sport Medicine and Prevention, University of Leipzig, Marschnerstraße 29a, 04109, Leipzig, Germany
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Fritzen AM, Thøgersen FB, Thybo K, Vissing CR, Krag TO, Ruiz-Ruiz C, Risom L, Wibrand F, Høeg LD, Kiens B, Duno M, Vissing J, Jeppesen TD. Adaptations in Mitochondrial Enzymatic Activity Occurs Independent of Genomic Dosage in Response to Aerobic Exercise Training and Deconditioning in Human Skeletal Muscle. Cells 2019; 8:cells8030237. [PMID: 30871120 PMCID: PMC6468422 DOI: 10.3390/cells8030237] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 03/08/2019] [Accepted: 03/09/2019] [Indexed: 12/15/2022] Open
Abstract
Mitochondrial DNA (mtDNA) replication is thought to be an integral part of exercise-training-induced mitochondrial adaptations. Thus, mtDNA level is often used as an index of mitochondrial adaptations in training studies. We investigated the hypothesis that endurance exercise training-induced mitochondrial enzymatic changes are independent of genomic dosage by studying mtDNA content in skeletal muscle in response to six weeks of knee-extensor exercise training followed by four weeks of deconditioning in one leg, comparing results to the contralateral untrained leg, in 10 healthy, untrained male volunteers. Findings were compared to citrate synthase activity, mitochondrial complex activities, and content of mitochondrial membrane markers (porin and cardiolipin). One-legged knee-extensor exercise increased endurance performance by 120%, which was accompanied by increases in power output and peak oxygen uptake of 49% and 33%, respectively (p < 0.01). Citrate synthase and mitochondrial respiratory chain complex I–IV activities were increased by 51% and 46–61%, respectively, in the trained leg (p < 0.001). Despite a substantial training-induced increase in mitochondrial activity of TCA and ETC enzymes, there was no change in mtDNA and mitochondrial inner and outer membrane markers (i.e., cardiolipin and porin). Conversely, deconditioning reduced endurance capacity by 41%, muscle citrate synthase activity by 32%, and mitochondrial complex I–IV activities by 29–36% (p < 0.05), without any change in mtDNA and porin and cardiolipin content in the previously trained leg. The findings demonstrate that the adaptations in mitochondrial enzymatic activity after aerobic endurance exercise training and the opposite effects of deconditioning are independent of changes in the number of mitochondrial genomes, and likely relate to changes in the rate of transcription of mtDNA.
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Affiliation(s)
- Andreas M Fritzen
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Frank B Thøgersen
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Kasper Thybo
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Christoffer R Vissing
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Thomas O Krag
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
- Department of Neurology, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Cristina Ruiz-Ruiz
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Lotte Risom
- Department of Clinical Genetics, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Flemming Wibrand
- Department of Clinical Genetics, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Louise D Høeg
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Bente Kiens
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Morten Duno
- Department of Clinical Genetics, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - John Vissing
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
- Department of Neurology, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
| | - Tina D Jeppesen
- Copenhagen Neuromuscular Center, Section 3342, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
- Department of Neurology, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
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Rubio-Ruiz ME, Guarner-Lans V, Pérez-Torres I, Soto ME. Mechanisms Underlying Metabolic Syndrome-Related Sarcopenia and Possible Therapeutic Measures. Int J Mol Sci 2019; 20:ijms20030647. [PMID: 30717377 PMCID: PMC6387003 DOI: 10.3390/ijms20030647] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 01/30/2019] [Accepted: 01/30/2019] [Indexed: 12/15/2022] Open
Abstract
Although there are several reviews that report the interrelationship between sarcopenia and obesity and insulin resistance, the relation between sarcopenia and the other signs that compose the metabolic syndrome (MetS) has not been extensively revised. Here, we review the mechanisms underlying MetS-related sarcopenia and discuss the possible therapeutic measures proposed. A vicious cycle between the loss of muscle and the accumulation of intramuscular fat might be associated with MetS via a complex interplay of factors including nutritional intake, physical activity, body fat, oxidative stress, proinflammatory cytokines, insulin resistance, hormonal changes, and mitochondrial dysfunction. The enormous differences in lipid storage capacities between the two genders and elevated amounts of endogenous fat having lipotoxic effects that lead to the loss of muscle mass are discussed. The important repercussions of MetS-related sarcopenia on other illnesses that lead to increased disability, morbidity, and mortality are also addressed. Additional research is needed to better understand the pathophysiology of MetS-related sarcopenia and its consequences. Although there is currently no consensus on the treatment, lifestyle changes including diet and power exercise seem to be the best options.
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Affiliation(s)
- María Esther Rubio-Ruiz
- Department of Physiology, Instituto Nacional de Cardiología "Ignacio Chávez", Juan Badiano 1, Sección XVI, Tlalpan, Mexico City 14080, Mexico.
| | - Verónica Guarner-Lans
- Department of Physiology, Instituto Nacional de Cardiología "Ignacio Chávez", Juan Badiano 1, Sección XVI, Tlalpan, Mexico City 14080, Mexico.
| | - Israel Pérez-Torres
- Department of Pathology, Instituto Nacional de Cardiología "Ignacio Chávez", Juan Badiano 1, Sección XVI, Tlalpan, Mexico City 14080, Mexico.
| | - María Elena Soto
- Department of Immunology, Instituto Nacional de Cardiología "Ignacio Chávez", Juan Badiano 1, Sección XVI, Tlalpan, Mexico City 14080, Mexico.
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Flynn MG, Markofski MM, Carrillo AE. Elevated Inflammatory Status and Increased Risk of Chronic Disease in Chronological Aging: Inflamm-aging or Inflamm-inactivity? Aging Dis 2019; 10:147-156. [PMID: 30705775 PMCID: PMC6345337 DOI: 10.14336/ad.2018.0326] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Accepted: 03/26/2018] [Indexed: 12/12/2022] Open
Abstract
Age-associated hyper-inflammation or "inflamm-aging" has been linked to the development of chronic diseases and characterized as an unavoidable aspect of aging. However, the inflamm-aging model does not adequately address the potential anti-inflammatory effects of exercise training and the potential for exercise to ameliorate several age-related diseases. In this brief review, we introduce a new paradigm-inflamm-inactivity-that describes a potent counter-measure to age-associated inflammatory illness.
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Affiliation(s)
- Michael G. Flynn
- HCA South Atlantic Division, Charleston, SC 29492, USA
- College of Charleston, Charleston, SC 29424, USA
| | - Melissa M. Markofski
- University of Houston, Department of Health and Human Performance, Houston, TX 77204, USA
| | - Andres E. Carrillo
- Department of Exercise Science, Chatham University, Pittsburgh, PA 15232, USA
- FAME Laboratory, Department of Exercise Science, University of Thessaly, Trikala, Greece
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Association of PPARGC1A Gly428Ser (rs8192678) polymorphism with potential for athletic ability and sports performance: A meta-analysis. PLoS One 2019; 14:e0200967. [PMID: 30625151 PMCID: PMC6326506 DOI: 10.1371/journal.pone.0200967] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Accepted: 12/18/2018] [Indexed: 12/31/2022] Open
Abstract
Background Genetics plays a role in determining potential for athletic ability (AA) and sports performance (SP). In this study, AA involves comparing sedentary controls with competitive athletes in power and endurance activities as well as a mix between the two (SP). However, variable results from genetic association studies warrant a meta-analysis to obtain more precise estimates of the association between PPARGC1A Gly482Ser polymorphism and AA/SP. Methods Multi-database literature search yielded 14 articles (16 studies) for inclusion. Pooled odds ratios (ORs) and 95% confidence intervals (CI) were used to estimate associations. Summary effects were modified based on statistical power. Subgroup analysis was based on SP (power, endurance and mixed) and race (Caucasians and Asians). Heterogeneity was assessed with the I2 metric and its sources examined with outlier analysis which dichotomized our findings into pre- (PRO) and post-outlier (PSO). Results Gly allele effects significantly favoring AA/SP (OR > 1.0, P < 0.05) form the core of our findings in: (i) homogeneous overall effect at the post-modified, PSO level (OR 1.13, 95% CI 1.03–1.25, P = 0.01, I2 = 0%); (ii) initially homogeneous power SP (ORs 1.22–1.25, 95% CI 1.05–1.44, P = 0.003–0.008, I2 = 0%) which precluded outlier treatment; (iii) PRO Caucasian outcomes (ORs 1.29–1.32, 95% CI 1.12–1.54, P = 0.0005) over that of Asians with a pooled null effect (OR 0.99, 95% CI 0.72–1.99, P = 0.53–0.92) and (iv) homogeneous all > 80% (ORs 1.19–1.38, 95% CI 1.05–1.66, P = 0.0007–0.007, I2 = 0%) on account of high statistical power (both study-specific and combined). In contrast, none of the Ser allele effects significantly favored AA/SP and no Ser-Gly genotype outcome favored AA/SP. The core significant outcomes were robust and showed no evidence of publication bias. Conclusion Meta-analytical applications in this study generated evidence that show association between the Gly allele and AA/SP. These were observed in the overall, Caucasians and statistically powered comparisons which exhibited consistent significance, stability, robustness, precision and lack of bias. Our central findings rest on association of the Gly allele with endurance and power, differentially favoring the latter over the former.
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Kristensen CM, Jessen H, Ringholm S, Pilegaard H. Muscle PGC-1α in exercise and fasting-induced regulation of hepatic UPR in mice. Acta Physiol (Oxf) 2018; 224:e13158. [PMID: 29939478 DOI: 10.1111/apha.13158] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 06/15/2018] [Accepted: 06/21/2018] [Indexed: 01/19/2023]
Abstract
AIM To provide a detailed time course of hepatic autophagy and all UPR branches in response to an acute bout of exercise and 24 hours of fasting and test the hypothesis that muscle-specific PGC-1α overexpression dampens the UPR and autophagy responses to these metabolic challenges. METHODS Muscle-specific PGC-1α overexpression (TG) and wild-type (WT) mice (a) performed a single bout of exercise, where the liver was obtained immediately after exercise, 2, 6 or 10 hours into recovery as well as from resting mice or (b) fasted for 24 hours or remained fed and the liver was obtained. RESULTS In both genotypes, hepatic PERK and eIF2α phosphorylation increased immediately after exercise, with no change in IRE1α phosphorylation and cleaved ATF6 protein. Fasting decreased PERK, eIF2α and IRE1α phosphorylation as well as increased cleaved ATF6 protein in both genotypes. Hepatic p62 was unchanged, while LC3II/LC3I ratio increased immediately after exercise and LC3II protein increased in response to fasting in both genotypes. TG mice had lower eIF2α phosphorylation after exercise, a blunted fasting-induced CHOP and HSP72 mRNA response and in fasted mice lower GADD34 and BiP mRNA as well as FAS protein in the liver than WT mice. CONCLUSION This study provides for the first time evidence for transient pathway-specific activation of hepatic UPR and increase in markers of autophagy in the liver with acute exercise. On the other hand, fasting both increased and decreased UPR branches and seemed to increase autophagy. In addition, muscle PGC-1α seemed to dampen some of these responses.
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Affiliation(s)
| | - Henrik Jessen
- Department of Biology; University of Copenhagen; Copenhagen Denmark
| | - Stine Ringholm
- Department of Biology; University of Copenhagen; Copenhagen Denmark
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67
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Broatch JR, Petersen A, Bishop DJ. The Influence of Post-Exercise Cold-Water Immersion on Adaptive Responses to Exercise: A Review of the Literature. Sports Med 2018; 48:1369-1387. [PMID: 29627884 DOI: 10.1007/s40279-018-0910-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Post-exercise cold-water immersion (CWI) is used extensively in exercise training as a means to minimise fatigue and expedite recovery between sessions. However, debate exists around its merit in long-term training regimens. While an improvement in recovery following a single session of exercise may improve subsequent training quality and stimulus, reports have emerged suggesting CWI may attenuate long-term adaptations to exercise training. Recent developments in the understanding of the molecular mechanisms governing the adaptive response to exercise in human skeletal muscle have provided potential mechanistic insight into the effects of CWI on training adaptations. Preliminary evidence suggests that CWI may blunt resistance signalling pathways following a single exercise session, as well as attenuate key long-term resistance training adaptations such as strength and muscle mass. Conversely, CWI may augment endurance signalling pathways and the expression of genes key to mitochondrial biogenesis following a single endurance exercise session, but have little to no effect on the content of proteins key to mitochondrial biogenesis following long-term endurance training. This review explores current evidence regarding the underlying molecular mechanisms by which CWI may alter cellular signalling and the long-term adaptive response to exercise in human skeletal muscle.
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Affiliation(s)
- James R Broatch
- Institute for Health and Sport, Victoria University, Melbourne, VIC, Australia.
- Department of Physiology, Australian Institute of Sport, Canberra, ACT, Australia.
| | - Aaron Petersen
- Institute for Health and Sport, Victoria University, Melbourne, VIC, Australia
| | - David J Bishop
- Institute for Health and Sport, Victoria University, Melbourne, VIC, Australia
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
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A Brief Review on Concurrent Training: From Laboratory to the Field. Sports (Basel) 2018; 6:sports6040127. [PMID: 30355976 PMCID: PMC6315763 DOI: 10.3390/sports6040127] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 10/14/2018] [Accepted: 10/17/2018] [Indexed: 12/31/2022] Open
Abstract
The majority of sports rely on concurrent training (CT; e.g., the simultaneous training of strength and endurance). However, a phenomenon called “Concurrent training effect” (CTE), which is a compromise in adaptation resulting from concurrent training, appears to be mostly affected by the interference of the molecular pathways of the underlying adaptations from each type of training segments. Until now, it seems that the volume, intensity, type, frequency of endurance training, as well as the training history and background strongly affect the CTE. High volume, moderate, continuous and frequent endurance training, are thought to negatively affect the resistance training-induced adaptations, probably by inhibition of the Protein kinase B—mammalian target of rapamycin pathway activation, of the adenosine monophosphate-activated protein kinase (AMPK). In contrast, it seems that short bouts of high-intensity interval training (HIIT) or sprint interval training (SIT) minimize the negative effects of concurrent training. This is particularly the case when HIIT and SIT incorporated in cycling have even lower or even no negative effects, while they provide at least the same metabolic adaptations, probably through the peroxisome proliferator-activated receptor-γ coactivator (PGC-1a) pathway. However, significant questions about the molecular events underlying the CTE remain unanswered.
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Sakita M, Murakami S, Fujino H, Hayashi S, Kameyama K, Saito T, Kumagai S. Remodeling of myelinated fibers and internal capillaries in distal peripheral nerves following aerobic exercise in aged rats. J Appl Physiol (1985) 2018; 125:1051-1061. [DOI: 10.1152/japplphysiol.00257.2018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to determine whether aerobic exercise (AE) in old age contributes to improving the morphologies of myelinated fibers (MFs) in peripheral nerves as well as capillaries. Furthermore, we investigated whether such processes are associated with complementary activity of brain-derived neurotrophic factor (BDNF) and vascular endothelial growth factor (VEGF) in the circulating blood and peripheral nerve tissue. Fourteen male Wistar rats (age: 95 wk) were randomly divided into moderate AE ( n = 8) and sedentary (SED; n = 6) groups. Rats in the AE group performed treadmill running for 1 h per day for 2 wk, following which the bilateral tibial nerves of the two groups were removed to examine MF and capillary structure. Levels of BDNF and VEGF in the serum and peripheral nerves were analyzed via enzyme-linked immunosorbent assay. Myelin thickness, axon diameter, and capillary luminal diameter were significantly larger in the AE group than in the SED group ( P < 0.0001). Levels of serum BDNF and VEGF were significantly lower and higher, respectively, in the AE group than in the SED group ( P < 0.001). Conversely, BDNF and VEGF levels in tibial nerve tissue were significantly higher, respectively, and lower in the AE group than in the SED group ( P < 0.001). In conclusion, our study indicates that regular AE induces enlargement of the capillaries and thickens the myelin in aged peripheral nerves, likely via a complementary process involving BDNF and VEGF. NEW & NOTEWORTHY Accumulating evidence indicates that age-related sarcopenia is accompanied by the degeneration of myelinated fibers (MFs) in peripheral nerves. Our study indicates that regular aerobic exercise contributes to increased thickness of the myelin surrounding MFs and enlargement of the capillaries, likely via a complementary process involving brain-derived neurotrophic factor and vascular endothelial growth factor. Our findings demonstrate that regular, moderate-intensity aerobic exercise may help to prevent and reverse peripheral nerve regression in older adults.
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Affiliation(s)
- Masahiro Sakita
- Faculty of Health Sciences, Department of Physical Therapy, Kyoto Tachibana University, Kyoto City, Kyoto, Japan
| | - Shinichiro Murakami
- Faculty of Health Care Sciences, Department of Physical Therapy, Himeji-Dokkyo University, Himeji City, Hyogo, Japan
| | - Hidemi Fujino
- Department of Rehabilitation Science, Kobe University Graduate School of Health Sciences, Kobe City, Hyogo, Japan
| | - Satoshi Hayashi
- Dentistry and Pharmaceutical Sciences, Okayama University Graduate School of Medicine, Okayama City, Okayama, Japan
| | - Kazuyoshi Kameyama
- Department of Occupational Therapy, Hakuhokai Medical Technical School Ako, Ako City, Hyogo, Japan
| | - Takafumi Saito
- Department of Physical Therapy, Aso Rehabilitation College, Hakata Ward, Fukuoka, Japan
| | - Shuzo Kumagai
- Laboratory of Health and Exercise Epidemiology, Center for Health Science and Counseling, Kyushu University, Kasuga City, Fukuoka, Japan
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70
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Bourdeau Julien I, Sephton CF, Dutchak PA. Metabolic Networks Influencing Skeletal Muscle Fiber Composition. Front Cell Dev Biol 2018; 6:125. [PMID: 30324104 PMCID: PMC6172607 DOI: 10.3389/fcell.2018.00125] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 09/10/2018] [Indexed: 12/19/2022] Open
Abstract
Advancements in metabolomic and genomic research tools are revealing new insights into how metabolic networks can influence skeletal muscle fiber composition. In this mini-review, we summarize the recent progress of metabolite-dependent signaling pathways and transcriptional regulators that control glycolytic and oxidative metabolism and ultimately influence the type of fibers in muscle depots. These mechanisms expand the role of metabolites beyond that of basic building blocks of cellular components, and illustrate how particular metabolites can take an active role in regulating metabolic homeostasis and fiber adaptation. As new metabolite-dependent mechanisms emerge, ongoing metabolomic studies have begun to help explain why distinct metabolic pathways are used in different biological contexts and widen the view of seminal observations like the Warburg effect.
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Affiliation(s)
- Isabelle Bourdeau Julien
- Department of Psychiatry and Neuroscience, Université Laval, Quebec, QC, Canada.,CERVO Brain Research Centre, Quebec, QC, Canada
| | - Chantelle F Sephton
- Department of Psychiatry and Neuroscience, Université Laval, Quebec, QC, Canada.,CERVO Brain Research Centre, Quebec, QC, Canada
| | - Paul A Dutchak
- Department of Psychiatry and Neuroscience, Université Laval, Quebec, QC, Canada.,CERVO Brain Research Centre, Quebec, QC, Canada
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71
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Popov DV, Lysenko EA, Bokov RO, Volodina MA, Kurochkina NS, Makhnovskii PA, Vyssokikh MY, Vinogradova OL. Effect of aerobic training on baseline expression of signaling and respiratory proteins in human skeletal muscle. Physiol Rep 2018; 6:e13868. [PMID: 30198217 PMCID: PMC6129775 DOI: 10.14814/phy2.13868] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 08/24/2018] [Indexed: 12/30/2022] Open
Abstract
Most studies examining the molecular mechanisms underlying adaptation of human skeletal muscles to aerobic exercise focused on the response to acute exercise. Here, we examined the effect of a 2-month aerobic training program on baseline parameters in human muscle. Ten untrained males performed a one-legged knee extension exercise for 1 h with the same relative intensity before and after a 2-month aerobic training program. Biopsy samples were taken from vastus lateralis muscle at rest before and after the 2 month training program (baseline samples). Additionally, biopsy samples were taken from the exercised leg 1 and 4 h after the one-legged continuous knee extension exercise. Aerobic training decreases baseline phosphorylation of FOXO1Ser256 , increases that of CaMKIIThr286 , CREB1Ser133 , increases baseline expression of mitochondrial proteins in respiratory complexes I-V, and some regulators of mitochondrial biogenesis (TFAM, NR4A3, and CRTC2). An increase in the baseline content of these proteins was not associated with a change in baseline expression of their genes. The increase in the baseline content of regulators of mitochondrial biogenesis (TFAM and NR4A3) was associated with a transient increase in transcription after acute exercise. Contrariwise, the increase in the baseline content of respiratory proteins does not seem to be regulated at the transcriptional level; rather, it is associated with other mechanisms. Adaptation of human skeletal muscle to regular aerobic exercise is associated not only with transient molecular responses to exercise, but also with changes in baseline phosphorylation and expression of regulatory proteins.
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Affiliation(s)
- Daniil V. Popov
- Laboratory of Exercise PhysiologyInstitute of Biomedical Problems of the Russian Academy of SciencesMoscowRussia
- Faculty of Fundamental MedicineM.V. Lomonosov Moscow State UniversityMoscowRussia
| | - Evgeny A. Lysenko
- Laboratory of Exercise PhysiologyInstitute of Biomedical Problems of the Russian Academy of SciencesMoscowRussia
- Faculty of Fundamental MedicineM.V. Lomonosov Moscow State UniversityMoscowRussia
| | - Roman O. Bokov
- Laboratory of Exercise PhysiologyInstitute of Biomedical Problems of the Russian Academy of SciencesMoscowRussia
| | - Maria A. Volodina
- Laboratory of Mitochondrial MedicineResearch Center for ObstetricsGynecology and PerinatologyMinistry of Healthcare of the Russian FederationMoscowRussia
| | - Nadia S. Kurochkina
- Laboratory of Exercise PhysiologyInstitute of Biomedical Problems of the Russian Academy of SciencesMoscowRussia
| | - Pavel A. Makhnovskii
- Laboratory of Exercise PhysiologyInstitute of Biomedical Problems of the Russian Academy of SciencesMoscowRussia
| | - Mikhail Y. Vyssokikh
- Laboratory of Mitochondrial MedicineResearch Center for ObstetricsGynecology and PerinatologyMinistry of Healthcare of the Russian FederationMoscowRussia
| | - Olga L. Vinogradova
- Laboratory of Exercise PhysiologyInstitute of Biomedical Problems of the Russian Academy of SciencesMoscowRussia
- Faculty of Fundamental MedicineM.V. Lomonosov Moscow State UniversityMoscowRussia
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72
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Cai JG, Luo LM, Tang H, Zhou L. Cytotoxicity of Malondialdehyde and Cytoprotective Effects of Taurine via Oxidative Stress and PGC-1α Signal Pathway in C2C12 Cells. Mol Biol 2018. [DOI: 10.1134/s0026893318040040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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73
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Popov DV. Adaptation of Skeletal Muscles to Contractile Activity of Varying Duration and Intensity: The Role of PGC-1α. BIOCHEMISTRY (MOSCOW) 2018; 83:613-628. [DOI: 10.1134/s0006297918060019] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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74
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Ferguson RA. Blood flow-restricted exercise: Providing more bang for buck in trained athletes? Acta Physiol (Oxf) 2018; 223:e13065. [PMID: 29575714 DOI: 10.1111/apha.13065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Richard A Ferguson
- School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, UK
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75
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Thompson C, Vanhatalo A, Kadach S, Wylie LJ, Fulford J, Ferguson SK, Blackwell JR, Bailey SJ, Jones AM. Discrete physiological effects of beetroot juice and potassium nitrate supplementation following 4-wk sprint interval training. J Appl Physiol (1985) 2018; 124:1519-1528. [DOI: 10.1152/japplphysiol.00047.2018] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The physiological and exercise performance adaptations to sprint interval training (SIT) may be modified by dietary nitrate ([Formula: see text]) supplementation. However, it is possible that different types of [Formula: see text] supplementation evoke divergent physiological and performance adaptations to SIT. The purpose of this study was to compare the effects of 4-wk SIT with and without concurrent dietary [Formula: see text] supplementation administered as either [Formula: see text]-rich beetroot juice (BR) or potassium [Formula: see text] (KNO3). Thirty recreationally active subjects completed a battery of exercise tests before and after a 4-wk intervention in which they were allocated to one of three groups: 1) SIT undertaken without dietary [Formula: see text] supplementation (SIT); 2) SIT accompanied by concurrent BR supplementation (SIT + BR); or 3) SIT accompanied by concurrent KNO3 supplementation (SIT + KNO3). During severe-intensity exercise, V̇o2peak and time to task failure were improved to a greater extent with SIT + BR than SIT and SIT + KNO3 ( P < 0.05). There was also a greater reduction in the accumulation of muscle lactate at 3 min of severe-intensity exercise in SIT + BR compared with SIT + KNO3 ( P < 0.05). Plasma [Formula: see text] concentration fell to a greater extent during severe-intensity exercise in SIT + BR compared with SIT and SIT + KNO3 ( P < 0.05). There were no differences between groups in the reduction in the muscle phosphocreatine recovery time constant from pre- to postintervention ( P > 0.05). These findings indicate that 4-wk SIT with concurrent BR supplementation results in greater exercise capacity adaptations compared with SIT alone and SIT with concurrent KNO3 supplementation. This may be the result of greater NO-mediated signaling in SIT + BR compared with SIT + KNO3. NEW & NOTEWORTHY We compared the influence of different forms of dietary nitrate supplementation on the physiological and performance adaptations to sprint interval training (SIT). Compared with SIT alone, supplementation with nitrate-rich beetroot juice, but not potassium [Formula: see text], enhanced some physiological adaptations to training.
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Affiliation(s)
| | - Anni Vanhatalo
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Stefan Kadach
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Lee J. Wylie
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Jonathan Fulford
- University of Exeter Medical School and National Institute for Health Research, Exeter Clinical Research Facility, Exeter, United Kingdom
| | - Scott K. Ferguson
- Cardiovascular and Pulmonary Research Laboratory, Department of Medicine, Anschutz Medical Campus, University of Colorado Denver, Aurora, Colorado
| | | | - Stephen J. Bailey
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Andrew M. Jones
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
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Abstract
Adaptive Homeostasis has been defined as, "The transient expansion or contraction of the homeostatic range in response to exposure to sub-toxic, non-damaging, signaling molecules or events, or the removal or cessation of such molecules or events." (Davies, 2016). I propose that one of the most significant examples of adaptive homeostasis may be the adaptation of the cardiovascular system to exercise training. In particular, endurance type training involves the generation of increased levels of free radicals such as ubisemiquinone, superoxide, nitric oxide, and other (non-radical) reactive oxygen species such as hydrogen peroxide (H2O2), in a repetitive manner, typically several times per week. As long as the training intensity and duration are sub-maximal and not exhaustive these reactive species do not cause damage, but rather activate signal transduction pathways to induce mitochondrial biogenesis-the foundation of increased exercise endurance. Particularly important are the NFκB and Nrf2 signal transduction pathways which respond to reactive oxygen and nitrogen species generated during exercise. As with other examples of adaptive homeostasis the effects are transient, lasting only as long as the training is maintained. Unfortunately, the ability to adapt to exercise training declines with age, perhaps as a result of impaired Nrf2 and NFκB signaling, as does adaptive homeostasis capacity in general. Since this is an Hypothesis/Theory Paper and not a review, I have not tried to provide a comprehensive discussion of all the literature relating to exercise adaptation and the cardiovascular system. Rather, I have attempted to develop the Hypothesis or Theory that adaptive homeostasis is the foundation for adaptation of the cardiovascular system to exercise training, largely based on work from my own laboratory, that of close collaborators, and that of key contributors over a period of almost 40 years.
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Affiliation(s)
- Kelvin J. A. Davies
- Leonard Davis School of Gerontology of the Ethel Percy Andrus Gerontology Center, University of Southern California, Los Angeles, CA, United States
- Molecular and Computational Biology Program, Department of Biological Sciences, Dornsife College of Letters, Arts, and Sciences, University of Southern California, Los Angeles, CA, United States
- Department of Biochemistry and Molecular Medicine, USC Keck School of Medicine, University of Southern California, Los Angeles, CA, United States
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77
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Lysenko EA, Vepkhvadze TF, Lednev EM, Vinogradova OL, Popov DV. Branched-chain amino acids administration suppresses endurance exercise-related activation of ubiquitin proteasome signaling in trained human skeletal muscle. J Physiol Sci 2018; 68:43-53. [PMID: 27913948 PMCID: PMC10717082 DOI: 10.1007/s12576-016-0506-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Accepted: 11/15/2016] [Indexed: 12/31/2022]
Abstract
We tested whether post exercise ingestion of branched-chain amino acids (BCAA < 10 g) is sufficient to activate signaling associated with muscle protein synthesis and suppress exercise-induced activation of mechanisms associated with proteolysis in endurance-trained human skeletal muscle. Nine endurance-trained athletes performed a cycling bout with and without BCAA ingestion (0.1 g/kg). Post exercise ACCSer79/222 phosphorylation (endogenous marker of AMPK activity) was increased (~3-fold, P < 0.05) in both sessions. No changes were observed in IGF1 mRNA isoform expression or phosphorylation of the key anabolic markers - p70S6K1Thr389 and eEF2Thr56 - between the sessions. BCAA administration suppressed exercise-induced expression of mTORC1 inhibitor DDIT4 mRNA, eliminated activation of the ubiquitin proteasome system, detected in the control session as decreased FOXO1Ser256 phosphorylation (0.83-fold change, P < 0.05) and increased TRIM63 (MURF1) expression (2.4-fold, P < 0.05). Therefore, in endurance-trained human skeletal muscle, post exercise BCAA ingestion partially suppresses exercise-induced expression of PGC-1a mRNA, activation of ubiquitin proteasome signaling, and suppresses DDIT4 mRNA expression.
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Affiliation(s)
- Evgeny A Lysenko
- Laboratory of Exercise Physiology, Institute of Biomedical Problems, Russian Academy of Sciences, Khoroshevskoye shosse, 76A, Moscow, 123007, Russia.
- Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect, 27-1, Moscow, 119192, Russia.
| | - Tatiana F Vepkhvadze
- Laboratory of Exercise Physiology, Institute of Biomedical Problems, Russian Academy of Sciences, Khoroshevskoye shosse, 76A, Moscow, 123007, Russia
| | - Egor M Lednev
- Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect, 27-1, Moscow, 119192, Russia
| | - Olga L Vinogradova
- Laboratory of Exercise Physiology, Institute of Biomedical Problems, Russian Academy of Sciences, Khoroshevskoye shosse, 76A, Moscow, 123007, Russia
- Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect, 27-1, Moscow, 119192, Russia
| | - Daniil V Popov
- Laboratory of Exercise Physiology, Institute of Biomedical Problems, Russian Academy of Sciences, Khoroshevskoye shosse, 76A, Moscow, 123007, Russia
- Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect, 27-1, Moscow, 119192, Russia
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78
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Brandt N, Nielsen L, Thiellesen Buch B, Gudiksen A, Ringholm S, Hellsten Y, Bangsbo J, Pilegaard H. Impact of β-adrenergic signaling in PGC-1α-mediated adaptations in mouse skeletal muscle. Am J Physiol Endocrinol Metab 2018; 314:E1-E20. [PMID: 28874356 DOI: 10.1152/ajpendo.00082.2017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
PGC-1α has been suggested to regulate exercise training-induced metabolic adaptations and autophagy in skeletal muscle. The factors regulating PGC-1α, however, have not been fully resolved. The aim was to investigate the impact of β-adrenergic signaling in PGC-1α-mediated metabolic adaptations in skeletal muscle with exercise training. Muscle was obtained from muscle-specific PGC-1α knockout (MKO) and lox/lox mice 1) 3 h after a single exercise bout with or without prior injection of propranolol or 3 h after a single injection of clenbuterol and 2) after 5 wk of wheel running exercise training with or without propranolol treatment or after 5 wk of clenbuterol treatment. A single clenbuterol injection and an acute exercise bout similarly increased the mRNA content of both N-terminal and full-length PGC-1α isoforms, and prior propranolol treatment reduced the exercise-induced increase in mRNA of all isoforms. Furthermore, a single clenbuterol injection elicited a PGC-1α-dependent increase in cytochrome c and vascular endothelial growth factor mRNA, whereas prolonged clenbuterol treatment increased fiber size but reduced capillary density. Exercise training increased the protein content of OXPHOS, LC3I, and Parkin in a PGC-1α-dependent manner without effect of propranolol, while an exercise training-induced increase in Akt2 and p62 protein required PGC-1α and was blunted by prolonged propranolol treatment. This suggests that β-adrenergic signaling is not required for PGC-1α-mediated exercise training-induced adaptations in mitochondrial proteins, but contributes to exercise training-mediated adaptations in insulin signaling and autophagy regulation through PGC-1α. Furthermore, changes observed with acute stimulation of compounds like clenbuterol and propranolol may not lead to corresponding adaptations with prolonged treatment.
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Affiliation(s)
- Nina Brandt
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen , Copenhagen , Denmark
| | - Lene Nielsen
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen , Copenhagen , Denmark
| | - Bjørg Thiellesen Buch
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen , Copenhagen , Denmark
| | - Anders Gudiksen
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen , Copenhagen , Denmark
| | - Stine Ringholm
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen , Copenhagen , Denmark
| | - Ylva Hellsten
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen , Copenhagen , Denmark
| | - Jens Bangsbo
- Section of Integrated Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen , Copenhagen , Denmark
| | - Henriette Pilegaard
- Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen , Copenhagen , Denmark
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79
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Pugh JK, Faulkner SH, Turner MC, Nimmo MA. Satellite cell response to concurrent resistance exercise and high-intensity interval training in sedentary, overweight/obese, middle-aged individuals. Eur J Appl Physiol 2017; 118:225-238. [PMID: 29071380 PMCID: PMC5767196 DOI: 10.1007/s00421-017-3721-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 09/15/2017] [Indexed: 12/18/2022]
Abstract
Purpose Sarcopenia can begin from the 4–5th decade of life and is exacerbated by obesity and inactivity. A combination of resistance exercise (RE) and endurance exercise is recommended to combat rising obesity and inactivity levels. However, work continues to elucidate whether interference in adaptive outcomes occur when RE and endurance exercise are performed concurrently. This study examined whether a single bout of concurrent RE and high-intensity interval training (HIIT) alters the satellite cell response following exercise compared to RE alone. Methods Eight sedentary, overweight/obese, middle-aged individuals performed RE only (8 × 8 leg extensions at 70% 1RM), or RE + HIIT (10 × 1 min at 90% HRmax on a cycle ergometer). Muscle biopsies were collected from the vastus lateralis before and 96 h after the RE component to determine muscle fiber type-specific total (Pax7+ cells) and active (MyoD+ cells) satellite cell number using immunofluorescence microscopy. Results Type-I-specific Pax7+ (P = 0.001) cell number increased after both exercise trials. Type-I-specific MyoD+ (P = 0.001) cell number increased after RE only. However, an elevated baseline value in RE + HIIT compared to RE (P = 0.046) was observed, with no differences between exercise trials at 96 h (P = 0.21). Type-II-specific Pax7+ and MyoD+ cell number remained unchanged after both exercise trials (all P ≥ 0.13). Conclusion Combining a HIIT session after a single bout of RE does not interfere with the increase in type-I-specific total, and possibly active, satellite cell number, compared to RE only. Concurrent RE + HIIT may offer a time-efficient way to maximise the physiological benefits from a single bout of exercise in sedentary, overweight/obese, middle-aged individuals.
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Affiliation(s)
- Jamie K Pugh
- School of Sport, Exercise and Health Sciences and National Centre for Sport and Exercise Medicine, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.,College of Life and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Steve H Faulkner
- School of Sport, Exercise and Health Sciences and National Centre for Sport and Exercise Medicine, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.,Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
| | - Mark C Turner
- School of Sport, Exercise and Health Sciences and National Centre for Sport and Exercise Medicine, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Myra A Nimmo
- School of Sport, Exercise and Health Sciences and National Centre for Sport and Exercise Medicine, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK. .,College of Life and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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80
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Brandt N, Dethlefsen MM, Bangsbo J, Pilegaard H. PGC-1α and exercise intensity dependent adaptations in mouse skeletal muscle. PLoS One 2017; 12:e0185993. [PMID: 29049322 PMCID: PMC5648136 DOI: 10.1371/journal.pone.0185993] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 09/22/2017] [Indexed: 12/21/2022] Open
Abstract
The aim of the present study was to examine the role of PGC-1α in intensity dependent exercise and exercise training-induced metabolic adaptations in mouse skeletal muscle. Whole body PGC-1α knockout (KO) and littermate wildtype (WT) mice performed a single treadmill running bout at either low intensity (LI) for 40 min or moderate intensity (MI) for 20 min. Blood and quadriceps muscles were removed either immediately after exercise or at 3h or 6h into recovery from exercise and from resting controls. In addition PGC-1α KO and littermate WT mice were exercise trained at either low intensity (LIT) for 40 min or at moderate intensity (MIT) for 20 min 2 times pr. day for 5 weeks. In the first and the last week of the intervention period, mice performed a graded running endurance test. Quadriceps muscles were removed before and after the training period for analyses. The acute exercise bout elicited intensity dependent increases in LC3I and LC3II protein and intensity independent decrease in p62 protein in skeletal muscle late in recovery and increased LC3II with exercise training independent of exercise intensity and volume in WT mice. Furthermore, acute exercise and exercise training did not increase LC3I and LC3II protein in PGC-1α KO. In addition, exercise-induced mRNA responses of PGC-1α isoforms were intensity dependent. In conclusion, these findings indicate that exercise intensity affected autophagy markers differently in skeletal muscle and suggest that PGC-1α regulates both acute and exercise training-induced autophagy in skeletal muscle potentially in a PGC-1α isoform specific manner.
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Affiliation(s)
- Nina Brandt
- The August Krogh Club, Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, Copenhagen Ø, Denmark
| | - Maja Munk Dethlefsen
- The August Krogh Club, Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, Copenhagen Ø, Denmark
| | - Jens Bangsbo
- Section of Integrative Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, Universitetsparken 13, Copenhagen Ø, Denmark
| | - Henriette Pilegaard
- The August Krogh Club, Section for Cell Biology and Physiology, Department of Biology, University of Copenhagen, Universitetsparken 13, Copenhagen Ø, Denmark
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81
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Mechanisms Explaining Muscle Fatigue and Muscle Pain in Patients with Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS): a Review of Recent Findings. Curr Rheumatol Rep 2017; 19:1. [PMID: 28116577 DOI: 10.1007/s11926-017-0628-x] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
PURPOSE OF REVIEW Here, we review potential causes of muscle dysfunction seen in many patients with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) such as the effects of oxidative and nitrosative stress (O&NS) and mitochondrial impairments together with reduced heat shock protein production and a range of metabolic abnormalities. RECENT FINDINGS Several studies published in the last few years have highlighted the existence of chronic O&NS, inflammation, impaired mitochondrial function and reduced heat shock protein production in many patients with ME/CFS. These studies have also highlighted the detrimental effects of chronically elevated O&NS on muscle functions such as reducing the time to muscle fatigue during exercise and impairing muscle contractility. Mechanisms have also been revealed by which chronic O&NS and or impaired heat shock production may impair muscle repair following exercise and indeed the adaptive responses in the striated muscle to acute and chronic increases in physical activity. The presence of chronic O&NS, low-grade inflammation and impaired heat shock protein production may well explain the objective findings of increased muscle fatigue, impaired contractility and multiple dimensions of exercise intolerance in many patients with ME/CFS.
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82
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Laker RC, Drake JC, Wilson RJ, Lira VA, Lewellen BM, Ryall KA, Fisher CC, Zhang M, Saucerman JJ, Goodyear LJ, Kundu M, Yan Z. Ampk phosphorylation of Ulk1 is required for targeting of mitochondria to lysosomes in exercise-induced mitophagy. Nat Commun 2017; 8:548. [PMID: 28916822 PMCID: PMC5601463 DOI: 10.1038/s41467-017-00520-9] [Citation(s) in RCA: 313] [Impact Index Per Article: 44.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Accepted: 07/05/2017] [Indexed: 12/19/2022] Open
Abstract
Mitochondrial health is critical for skeletal muscle function and is improved by exercise training through both mitochondrial biogenesis and removal of damaged/dysfunctional mitochondria via mitophagy. The mechanisms underlying exercise-induced mitophagy have not been fully elucidated. Here, we show that acute treadmill running in mice causes mitochondrial oxidative stress at 3-12 h and mitophagy at 6 h post-exercise in skeletal muscle. These changes were monitored using a novel fluorescent reporter gene, pMitoTimer, that allows assessment of mitochondrial oxidative stress and mitophagy in vivo, and were preceded by increased phosphorylation of AMP activated protein kinase (Ampk) at tyrosine 172 and of unc-51 like autophagy activating kinase 1 (Ulk1) at serine 555. Using mice expressing dominant negative and constitutively active Ampk in skeletal muscle, we demonstrate that Ulk1 activation is dependent on Ampk. Furthermore, exercise-induced metabolic adaptation requires Ulk1. These findings provide direct evidence of exercise-induced mitophagy and demonstrate the importance of Ampk-Ulk1 signaling in skeletal muscle.Exercise is associated with biogenesis and removal of dysfunctional mitochondria. Here the authors use a mitochondrial reporter gene to demonstrate the occurrence of mitophagy following exercise in mice, and show this is dependent on AMPK and ULK1 signaling.
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Affiliation(s)
- Rhianna C Laker
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Joshua C Drake
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Rebecca J Wilson
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Vitor A Lira
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Department of Health and Human Physiology, Obesity Research and Education Initiative, Fraternal Order of Eagles Diabetes Research Center, University of Iowa, Iowa, IA, 52242, USA
| | - Bevan M Lewellen
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Karen A Ryall
- Department of Biomedical Engineering, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Carleigh C Fisher
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Mei Zhang
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Jeffrey J Saucerman
- Department of Biomedical Engineering, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA
| | - Laurie J Goodyear
- Research Division, Joslin Diabetes Center, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02215, USA
| | - Mondira Kundu
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN, 38105, USA
| | - Zhen Yan
- Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA. .,Center for Skeletal Muscle Research at Robert M. Berne Cardiovascular Research Center, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA. .,Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA. .,Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, 22908, USA.
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83
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Di Meo S, Iossa S, Venditti P. Improvement of obesity-linked skeletal muscle insulin resistance by strength and endurance training. J Endocrinol 2017; 234:R159-R181. [PMID: 28778962 DOI: 10.1530/joe-17-0186] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 06/26/2017] [Indexed: 12/30/2022]
Abstract
Obesity-linked insulin resistance is mainly due to fatty acid overload in non-adipose tissues, particularly skeletal muscle and liver, where it results in high production of reactive oxygen species and mitochondrial dysfunction. Accumulating evidence indicates that resistance and endurance training alone and in combination can counteract the harmful effects of obesity increasing insulin sensitivity, thus preventing diabetes. This review focuses the mechanisms underlying the exercise role in opposing skeletal muscle insulin resistance-linked metabolic dysfunction. It is apparent that exercise acts through two mechanisms: (1) it stimulates glucose transport by activating an insulin-independent pathway and (2) it protects against mitochondrial dysfunction-induced insulin resistance by increasing muscle antioxidant defenses and mitochondrial biogenesis. However, antioxidant supplementation combined with endurance training increases glucose transport in insulin-resistant skeletal muscle in an additive fashion only when antioxidants that are able to increase the expression of antioxidant enzymes and/or the activity of components of the insulin signaling pathway are used.
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Affiliation(s)
- Sergio Di Meo
- Dipartimento di BiologiaUniversità di Napoli 'Federico II', Napoli, Italy
| | - Susanna Iossa
- Dipartimento di BiologiaUniversità di Napoli 'Federico II', Napoli, Italy
| | - Paola Venditti
- Dipartimento di BiologiaUniversità di Napoli 'Federico II', Napoli, Italy
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84
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Lombardi G, Sansoni V, Banfi G. Measuring myokines with cardiovascular functions: pre-analytical variables affecting the analytical output. ANNALS OF TRANSLATIONAL MEDICINE 2017; 5:299. [PMID: 28856139 PMCID: PMC5555982 DOI: 10.21037/atm.2017.07.11] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 06/28/2017] [Indexed: 12/30/2022]
Abstract
In the last few years, a growing number of molecules have been associated to an endocrine function of the skeletal muscle. Circulating myokine levels, in turn, have been associated with several pathophysiological conditions including the cardiovascular ones. However, data from different studies are often not completely comparable or even discordant. This would be due, at least in part, to the whole set of situations related to the preparation of the patient prior to blood sampling, blood sampling procedure, processing and/or store. This entire process constitutes the pre-analytical phase. The importance of the pre-analytical phase is often not considered. However, in routine diagnostics, the 70% of the errors are in this phase. Moreover, errors during the pre-analytical phase are carried over in the analytical phase and affects the final output. In research, for example, when samples are collected over a long time and by different laboratories, a standardized procedure for sample collecting and the correct procedure for sample storage are acknowledged. In this review, we discuss the pre-analytical variables potentially affecting the measurement of myokines with cardiovascular functions.
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Affiliation(s)
- Giovanni Lombardi
- Laboratory of Experimental Biochemistry & Molecular Biology, IRCCS Galeazzi Orthopaedic Institute, Milan, Italy
| | - Veronica Sansoni
- Laboratory of Experimental Biochemistry & Molecular Biology, IRCCS Galeazzi Orthopaedic Institute, Milan, Italy
| | - Giuseppe Banfi
- Laboratory of Experimental Biochemistry & Molecular Biology, IRCCS Galeazzi Orthopaedic Institute, Milan, Italy
- Vita-Salute San Raffaele University, Milan, Italy
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85
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Pacheco C, Santos LHPD, Alves JO, Queiroz AND, Soares PM, Ceccatto VM. REGULAÇÃO GÊNICA DA VIA AMPK PELO EXERCÍCIO FÍSICO: REVISÃO SISTEMÁTICA E ANÁLISE IN SILICO. REV BRAS MED ESPORTE 2017. [DOI: 10.1590/1517-869220172304169935] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
RESUMO Introdução: Novos estudos de regulação gênica do exercício físico por meio de técnicas pós-genômicas em ensaios de resistência (endurance) e força caracterizam a transcriptômica do exercício físico. Entre os genes afetados, destacamos a via da proteína quinase ativada por AMP (AMPK), cuja ativação ocorre durante o exercício como resultado das alterações dos níveis de fosfato energético da fibra muscular. Objetivo: Avaliar a via de sinalização da AMPK por revisão sistemática da expressão de genes e análise in silico. Método: Foi efetuada uma revisão sistemática para avaliar a regulação gênica da via de sinalização AMPK, caracterizando os genes estudados na literatura, as variações de regulação obtidas, na forma de fold change e tipos de exercício usados. Resultados: A via de sinalização AMPK mostrou 133 genes no repositório KEGG (Kyoto Encyclopedia of Genes and Genomes), os quais foram confrontados com a revisão sistemática da literatura, totalizando 65 genes. Dezessete genes apresentaram UR e 24 mostraram DR com relação ao seu respectivo controle. Além destes, 20 genes estavam presentes nos trabalhos, apresentando tanto UR e DR e quatro genes não apresentaram dados de regulação. Verificou-se regulação específica em função do tipo de exercício efetuado. Discussão: Dos 133 genes da via AMPK, 48,8% foram amostrados nos trabalhos revisados, indicando que uma parte significativa da via é regulada pelo exercício. O estudo apresentou a regulação gênica básica de dois mecanismos para a recuperação energética, a biogênese mitocondrial e o bloqueio da gliconeogênese. Conclusão: Este trabalho mostrou que o exercício atua ativamente na via de sinalização da AMPK, na importância da regulação via PGC-1α e no papel de outros genes, regulando a expressão de mais da metade dos genes amostrados.
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86
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Baum O, Jentsch L, Odriozola A, Tschanz SA, Olfert IM. Ultrastructure of Skeletal Muscles in Mice Lacking Muscle‐Specific VEGF Expression. Anat Rec (Hoboken) 2017; 300:2239-2249. [DOI: 10.1002/ar.23644] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 04/11/2017] [Accepted: 04/30/2017] [Indexed: 01/22/2023]
Affiliation(s)
- Oliver Baum
- Institute of Physiology, Charité‐Universitätsmedizin BerlinBerlin Germany
| | - Lena Jentsch
- Institute of Anatomy, University of BernBern Switzerland
| | | | | | - I. Mark Olfert
- West Virginia Clinical and Translational Institute, Department of Exercise PhysiologyWest Virginia University School of MedicineMorgantown West Virginia
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87
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Yan Y, Yang X, Zhao T, Zou Y, Li R, Xu Y. Salicylates promote mitochondrial biogenesis by regulating the expression of PGC-1α in murine 3T3-L1 pre-adipocytes. Biochem Biophys Res Commun 2017; 491:436-441. [PMID: 28712868 DOI: 10.1016/j.bbrc.2017.07.074] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2017] [Accepted: 07/13/2017] [Indexed: 10/19/2022]
Abstract
Mitochondrial dysfunction has been associated with insulin resistance and diabetes. Decreased mitochondrial density and mitochondrial copy numbers have been found in insulin-resistant individuals. Restoration of the number of mitochondria and normal mitochondrial function has become an important therapeutic target of diabetes. Salicylate, the main active ingredient in aspirin, has been in medicinal use since ancient times. Little information regarding the effects of salicylate on mitochondrial function has been reported. In this study, we assessed the effects of salicylate on the peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α) signaling pathway and mitochondrial biogenesis in pre-adipocytes. Our findings demonstrate that treatment with salicylate promoted the expression of PGC-1α and its downstream targets nuclear respiratory factor 1 (NRF1) and mitochondrial transcription factor A (TFAM). Importantly, salicylate treatment significantly increased the number of mDNA, citrate synthase activity, expression of respiratory chain complex I, and mitochondrial mass, which were suppressed by the specific AMPK inhibitor Compound C. Indeed, salicylate treatment induced the phosphorylation of AMPK, which was involved in the induction of PGC-1α, NRF1, and TFAM. Importantly, inhibition of PGC-1α expression using PGC-1α small RNA interference abolished the effects of salicylate on mitochondrial biogenesis. These results suggest that salicylate has a potential therapeutic capacity against mitochondrial dysfunction in diabetes.
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Affiliation(s)
- Yimin Yan
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, 430071, Hubei Province, China
| | - Xiaohong Yang
- Department of Obstetrics and Gynecology, Xiaogan Central Hospital Affiliated to Wuhan University of Science and Technology, Xiaogan 432000, Hubei Province, China
| | - Tao Zhao
- Department of Endocrinology, Xiaogan Central Hospital Affiliated to Wuhan University of Science and Technology, Xiaogan, 432000, Hubei Province, China
| | - Yi Zou
- Department of Endocrinology, Xiaogan Central Hospital Affiliated to Wuhan University of Science and Technology, Xiaogan, 432000, Hubei Province, China
| | - Rui Li
- Department of Cardiovascular, Xiaogan Central Hospital Affiliated to Wuhan University of Science and Technology, Xiaogan, 432000, Hubei Province, China
| | - Yancheng Xu
- Department of Endocrinology, Zhongnan Hospital of Wuhan University, Wuhan, 430071, Hubei Province, China.
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88
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Eshima H, Miura S, Senoo N, Hatakeyama K, Poole DC, Kano Y. Improved skeletal muscle Ca 2+ regulation in vivo following contractions in mice overexpressing PGC-1α. Am J Physiol Regul Integr Comp Physiol 2017; 312:R1017-R1028. [PMID: 28438761 DOI: 10.1152/ajpregu.00032.2017] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 04/04/2017] [Accepted: 04/12/2017] [Indexed: 01/13/2023]
Abstract
In skeletal muscle, resting intracellular Ca2+ concentration ([Ca2+]i) homeostasis is exquisitely regulated by Ca2+ transport across the sarcolemmal, mitochondrial, and sarcoplasmic reticulum (SR) membranes. Of these three systems, the relative importance of the mitochondria in [Ca2+]i regulation remains poorly understood in in vivo skeletal muscle. We tested the hypothesis that the capacity for Ca2+ uptake by mitochondria is a primary factor in determining [Ca2+]i regulation in muscle at rest and following contractions. Tibialis anterior muscle of anesthetized peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α)-overexpressing (OE, increased mitochondria model) and wild-type (WT) littermate mice was exteriorized in vivo and loaded with the fluorescent probe fura 2-AM, and Rhod 2-AM Ca2+ buffering and mitochondrial [Ca2+] were evaluated at rest and during recovery from fatiguing tetanic contractions induced by electrical stimulation (120 s, 100 Hz). In addition, the effects of pharmacological inhibition of SR (thapsigargin) and mitochondrial [carbonyl cyanide-4-(trifluoromethoxy) phenylhydrazone (FCCP)] function were examined at rest. [Ca2+]i in WT remained elevated for the entire postcontraction recovery period (+6 ± 1% at 450 s), but in PGC-1α OE [Ca2+]i returned to resting baseline within 150 s. Thapsigargin immediately and substantially increased resting [Ca2+]i in WT, whereas in PGC-1α OE this effect was delayed and markedly diminished (WT, +12 ± 3; PGC-1α OE, +1 ± 2% at 600 s after thapsigargin treatment, P < 0.05). FCCP abolished this improvement of [Ca2+]i regulation in PGC-1α OE. Mitochondrial [Ca2+] accumulation was observed in PGC-1α OE following contractions and thapsigargin treatment. In the SR, PGC-1α OE downregulated SR Ca2+-ATPase 1 (Ca2+ uptake) and parvalbumin (Ca2+ buffering) protein levels, whereas mitochondrial Ca2+ uptake-related proteins (Mfn1, Mfn2, and mitochondrial Ca2+ uniporter) were upregulated. These data demonstrate a heretofore unappreciated role for skeletal muscle mitochondria in [Ca2+]i regulation in vivo following fatiguing tetanic contractions and at rest.
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Affiliation(s)
- Hiroaki Eshima
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Tokyo, Japan
| | - Shinji Miura
- Laboratory of Nutritional Biochemistry, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan; and
| | - Nanami Senoo
- Laboratory of Nutritional Biochemistry, Graduate School of Nutritional and Environmental Sciences, University of Shizuoka, Shizuoka, Japan; and
| | - Koji Hatakeyama
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Tokyo, Japan
| | - David C Poole
- Departments of Anatomy and Physiology and Kinesiology, Kansas State University, Manhattan, Kansas
| | - Yutaka Kano
- Department of Engineering Science, Bioscience and Technology Program, University of Electro-Communications, Tokyo, Japan;
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89
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Theilen NT, Kunkel GH, Tyagi SC. The Role of Exercise and TFAM in Preventing Skeletal Muscle Atrophy. J Cell Physiol 2017; 232:2348-2358. [PMID: 27966783 DOI: 10.1002/jcp.25737] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 12/13/2016] [Indexed: 12/31/2022]
Abstract
Skeletal muscle atrophy is the consequence of protein degradation exceeding protein synthesis. This arises for a multitude of reasons including the unloading of muscle during microgravity, post-surgery bedrest, immobilization of a limb after injury, and overall disuse of the musculature. The development of therapies prior to skeletal muscle atrophy settings to diminish protein degradation is scarce. Mitochondrial dysfunction is associated with skeletal muscle atrophy and contributes to the induction of protein degradation and cell apoptosis through increased levels of ROS observed with the loss of organelle function. ROS binds mtDNA, leading to its degradation and decreasing functionality. Mitochondrial transcription factor A (TFAM) will bind and coat mtDNA, protecting it from ROS and degradation while increasing mitochondrial function. Exercise stimulates cell signaling pathways that converge on and increase PGC-1α, a well-known activator of the transcription of TFAM and mitochondrial biogenesis. Therefore, in the present review we are proposing, separately, exercise and TFAM treatments prior to atrophic settings (muscle unloading or disuse) alleviate skeletal muscle atrophy through enhanced mitochondrial adaptations and function. Additionally, we hypothesize the combination of exercise and TFAM leads to a synergistic effect in targeting mitochondrial function to prevent skeletal muscle atrophy. J. Cell. Physiol. 232: 2348-2358, 2017. © 2016 The Authors. Journal of Cellular Physiology Published by © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Nicholas T Theilen
- Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky
| | - George H Kunkel
- Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky
| | - Suresh C Tyagi
- Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky
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90
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Roberts LD, Ashmore T, McNally BD, Murfitt SA, Fernandez BO, Feelisch M, Lindsay R, Siervo M, Williams EA, Murray AJ, Griffin JL. Inorganic Nitrate Mimics Exercise-Stimulated Muscular Fiber-Type Switching and Myokine and γ-Aminobutyric Acid Release. Diabetes 2017; 66:674-688. [PMID: 28028076 DOI: 10.2337/db16-0843] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 12/18/2016] [Indexed: 11/13/2022]
Abstract
Exercise is an effective intervention for the prevention and treatment of type 2 diabetes. Skeletal muscle combines multiple signals that contribute to the beneficial effects of exercise on cardiometabolic health. Inorganic nitrate increases exercise efficiency, tolerance, and performance. The transcriptional regulator peroxisome proliferator-activated receptor γ coactivator 1α (PGC1α) coordinates the exercise-stimulated skeletal muscle fiber-type switch from glycolytic fast-twitch (type IIb) to oxidative slow-twitch (type I) and intermediate (type IIa) fibers, an effect reversed in insulin resistance and diabetes. We found that nitrate induces PGC1α expression and a switch toward type I and IIa fibers in rat muscle and myotubes in vitro. Nitrate induces the release of exercise/PGC1α-dependent myokine FNDC5/irisin and β-aminoisobutyric acid from myotubes and muscle in rats and humans. Both exercise and nitrate stimulated PGC1α-mediated γ-aminobutyric acid (GABA) secretion from muscle. Circulating GABA concentrations were increased in exercising mice and nitrate-treated rats and humans; thus, GABA may function as an exercise/PGC1α-mediated myokine-like small molecule. Moreover, nitrate increased circulating growth hormone levels in humans and rodents. Nitrate induces physiological responses that mimic exercise training and may underlie the beneficial effects of this metabolite on exercise and cardiometabolic health.
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MESH Headings
- Adipocytes/drug effects
- Adipocytes/metabolism
- Aged
- Aminoisobutyric Acids
- Animals
- Beta vulgaris
- Chromatography, Liquid
- Double-Blind Method
- Female
- Fibronectins/drug effects
- Fibronectins/metabolism
- Fruit and Vegetable Juices
- Gas Chromatography-Mass Spectrometry
- Growth Hormone/metabolism
- Humans
- Immunohistochemistry
- In Vitro Techniques
- Insulin Resistance
- Male
- Mass Spectrometry
- Mice
- Mice, Transgenic
- Middle Aged
- Muscle Fibers, Fast-Twitch/drug effects
- Muscle Fibers, Fast-Twitch/metabolism
- Muscle Fibers, Skeletal/drug effects
- Muscle Fibers, Skeletal/metabolism
- Muscle Fibers, Slow-Twitch/drug effects
- Muscle Fibers, Slow-Twitch/metabolism
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/metabolism
- Nitrates/pharmacology
- Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha/drug effects
- Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha/genetics
- Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha/metabolism
- Physical Conditioning, Animal
- Rats
- Rats, Wistar
- Transcriptome
- gamma-Aminobutyric Acid/drug effects
- gamma-Aminobutyric Acid/metabolism
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Affiliation(s)
- Lee D Roberts
- Leeds Institute of Cardiovascular and Metabolic Medicine, Faculty of Medicine and Health, University of Leeds, Leeds, U.K.
- Medical Research Council-Human Nutrition Research, Elsie Widdowson Laboratory, Cambridge, U.K
- Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, U.K
| | - Tom Ashmore
- Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, U.K
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, U.K
| | - Ben D McNally
- Medical Research Council-Human Nutrition Research, Elsie Widdowson Laboratory, Cambridge, U.K
- Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, U.K
| | - Steven A Murfitt
- Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, U.K
| | - Bernadette O Fernandez
- Faculty of Medicine, Clinical and Experimental Sciences, University of Southampton, Southampton General Hospital, Southampton, U.K
| | - Martin Feelisch
- Faculty of Medicine, Clinical and Experimental Sciences, University of Southampton, Southampton General Hospital, Southampton, U.K
| | - Ross Lindsay
- Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, U.K
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, U.K
| | - Mario Siervo
- Human Nutrition Research Centre, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, U.K
| | - Elizabeth A Williams
- Human Nutrition Unit, Department of Oncology, Faculty of Medicine, Dentistry and Health, University of Sheffield, Sheffield, U.K
| | - Andrew J Murray
- Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, U.K
| | - Julian L Griffin
- Medical Research Council-Human Nutrition Research, Elsie Widdowson Laboratory, Cambridge, U.K
- Department of Biochemistry and Cambridge Systems Biology Centre, University of Cambridge, Cambridge, U.K
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91
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Bonafiglia JT, Edgett BA, Baechler BL, Nelms MW, Simpson CA, Quadrilatero J, Gurd BJ. Acute upregulation of PGC-1α mRNA correlates with training-induced increases in SDH activity in human skeletal muscle. Appl Physiol Nutr Metab 2017; 42:656-666. [PMID: 28177701 DOI: 10.1139/apnm-2016-0463] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The purpose of the present study was to determine if acute responses in PGC-1α, VEGFA, SDHA, and GPD1-2 mRNA expression predict their associated chronic skeletal muscle molecular (SDH-GPD activity and substrate storage) and morphological (fibre-type composition and capillary density) adaptations following training. Skeletal muscle biopsies were collected from 14 recreationally active men (age: 22.0 ± 2.4 years) before (PRE) and 3 h after (3HR) the completion of an acute bout of sprint interval training (SIT) (eight 20-s intervals at ∼170% peak oxygen uptake work rate separated by 10 s of recovery). Participants then completed 6 weeks of SIT 4 times per week with additional biopsies after 2 (MID) and 6 (POST) weeks of training. Acute increases in PGC-1α mRNA strongly predicted increases in SDH activity (a marker of oxidative capacity) from PRE and MID to POST (PRE-POST: r = 0.81, r2 = 0.65, p < 0.01; MID-POST: r = 0.79, r2 = 0.62, p < 0.01) and glycogen content from MID to POST (r = 0.60, r2 = 0.36, p < 0.05). No other significant relationships were found between acute responses in PGC-1α, VEGFA, SDHA, and GPD1-2 mRNA expression and chronic adaptations to training. These results suggest that acute upregulation of PGC-1α mRNA relates to the magnitude of subsequent training-induced increases in oxidative capacity, but not other molecular and morphological chronic skeletal muscle adaptations. Additionally, acute mRNA responses in PGC-1α correlated with VEGFA, but not SDHA, suggesting a coordinated upregulation between PGC-1α and only some of its proposed targets in human skeletal muscle.
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Affiliation(s)
- Jacob T Bonafiglia
- a School of Kinesiology and Health Studies, Queen's University, Kingston, ON K7L 3N6 Canada
| | - Brittany A Edgett
- a School of Kinesiology and Health Studies, Queen's University, Kingston, ON K7L 3N6 Canada
| | - Brittany L Baechler
- c Department of Kinesiology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Matthew W Nelms
- a School of Kinesiology and Health Studies, Queen's University, Kingston, ON K7L 3N6 Canada
| | - Craig A Simpson
- b Department of Emergency Medicine, Queen's University, Kingston, ON K7L 3N6, Canada
| | - Joe Quadrilatero
- c Department of Kinesiology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Brendon J Gurd
- a School of Kinesiology and Health Studies, Queen's University, Kingston, ON K7L 3N6 Canada
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92
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Jannig PR, Ruas JL. Targeting mitochondrial mRNA translation to tackle obesity-induced insulin resistance: thumbs up for exercise. Acta Physiol (Oxf) 2017; 219:14-16. [PMID: 27419811 DOI: 10.1111/apha.12752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- P. R. Jannig
- Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm Sweden
- School of Physical Education and Sport; University of São Paulo; São Paulo Brazil
| | - J. L. Ruas
- Department of Physiology and Pharmacology; Karolinska Institutet; Stockholm Sweden
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93
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Thompson C, Wylie LJ, Blackwell JR, Fulford J, Black MI, Kelly J, McDonagh STJ, Carter J, Bailey SJ, Vanhatalo A, Jones AM. Influence of dietary nitrate supplementation on physiological and muscle metabolic adaptations to sprint interval training. J Appl Physiol (1985) 2016; 122:642-652. [PMID: 27909231 DOI: 10.1152/japplphysiol.00909.2016] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 11/13/2016] [Accepted: 11/28/2016] [Indexed: 12/21/2022] Open
Abstract
We hypothesized that 4 wk of dietary nitrate supplementation would enhance exercise performance and muscle metabolic adaptations to sprint interval training (SIT). Thirty-six recreationally active subjects, matched on key variables at baseline, completed a series of exercise tests before and following a 4-wk period in which they were allocated to one of the following groups: 1) SIT and [Formula: see text]-depleted beetroot juice as a placebo (SIT+PL); 2) SIT and [Formula: see text]-rich beetroot juice (~13 mmol [Formula: see text]/day; SIT+BR); or 3) no training and [Formula: see text]-rich beetroot juice (NT+BR). During moderate-intensity exercise, pulmonary oxygen uptake was reduced by 4% following 4 wk of SIT+BR and NT+BR (P < 0.05) but not SIT+PL. The peak work rate attained during incremental exercise increased more in SIT+BR than in SIT+PL (P < 0.05) or NT+BR (P < 0.001). The reduction in muscle and blood [lactate] and the increase in muscle pH from preintervention to postintervention were greater at 3 min of severe-intensity exercise in SIT+BR compared with SIT+PL and NT+BR (P < 0.05). However, the change in severe-intensity exercise performance was not different between SIT+BR and SIT+PL (P > 0.05). The relative proportion of type IIx muscle fibers in the vastus lateralis muscle was reduced in SIT+BR only (P < 0.05). These findings suggest that BR supplementation may enhance some aspects of the physiological adaptations to SIT.NEW & NOTEWORTHY We investigated the influence of nitrate-rich and nitrate-depleted beetroot juice on the muscle metabolic and physiological adaptations to 4 wk of sprint interval training. Compared with placebo, dietary nitrate supplementation reduced the O2 cost of submaximal exercise, resulted in greater improvement in incremental (but not severe-intensity) exercise performance, and augmented some muscle metabolic adaptations to training. Nitrate supplementation may facilitate some of the physiological responses to sprint interval training.
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Affiliation(s)
| | - Lee J Wylie
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Jamie R Blackwell
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Jonathan Fulford
- National Institute for Health Research Exeter Clinical Research Facility, University of Exeter, Exeter, United Kingdom; and
| | - Matthew I Black
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - James Kelly
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | | | - James Carter
- Gatorade Sports Science Institute, PepsiCo Research & Development, Barrington, Illinois
| | - Stephen J Bailey
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Anni Vanhatalo
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Andrew M Jones
- Sport and Health Sciences, University of Exeter, Exeter, United Kingdom;
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94
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Coffey VG, Hawley JA. Concurrent exercise training: do opposites distract? J Physiol 2016; 595:2883-2896. [PMID: 27506998 DOI: 10.1113/jp272270] [Citation(s) in RCA: 164] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 08/05/2016] [Indexed: 12/19/2022] Open
Abstract
Specificity is a core principle of exercise training to promote the desired adaptations for maximising athletic performance. The principle of specificity of adaptation is underpinned by the volume, intensity, frequency and mode of contractile activity and is most evident when contrasting the divergent phenotypes that result after undertaking either prolonged endurance or resistance training. The molecular profiles that generate the adaptive response to different exercise modes have undergone intense scientific scrutiny. Given divergent exercise induces similar signalling and gene expression profiles in skeletal muscle of untrained or recreationally active individuals, what is currently unclear is how the specificity of the molecular response is modified by prior training history. The time course of adaptation and when 'phenotype specificity' occurs has important implications for exercise prescription. This context is essential when attempting to concomitantly develop resistance to fatigue (through endurance-based exercise) and increased muscle mass (through resistance-based exercise), typically termed 'concurrent training'. Chronic training studies provide robust evidence that endurance exercise can attenuate muscle hypertrophy and strength but the mechanistic underpinning of this 'interference' effect with concurrent training is unknown. Moreover, despite the potential for several key regulators of muscle metabolism to explain an incompatibility in adaptation between endurance and resistance exercise, it now seems likely that multiple integrated, rather than isolated, effectors or processes generate the interference effect. Here we review studies of the molecular responses in skeletal muscle and evidence for the interference effect with concurrent training within the context of the specificity of training adaptation.
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Affiliation(s)
- Vernon G Coffey
- Bond Institute of Health & Sport and Faculty of Health Sciences & Medicine, Bond University, Gold Coast, Queensland, 4226, Australia
| | - John A Hawley
- Centre for Exercise and Nutrition, Mary MacKillop Institute for Health Research, Australian Catholic University, Fitzroy, Melbourne, Victoria, 3065, Australia.,Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Liverpool, UK
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95
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Brenmoehl J, Ohde D, Albrecht E, Walz C, Tuchscherer A, Hoeflich A. Browning of subcutaneous fat and higher surface temperature in response to phenotype selection for advanced endurance exercise performance in male DUhTP mice. J Comp Physiol B 2016; 187:361-373. [PMID: 27695946 PMCID: PMC5253162 DOI: 10.1007/s00360-016-1036-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 09/12/2016] [Accepted: 09/20/2016] [Indexed: 12/18/2022]
Abstract
For the assessment of genetic or conditional factors of fat cell browning, novel and polygenic animal models are required. Therefore, the long-term selected polygenic mouse line DUhTP originally established in Dummerstorf for high treadmill performance is used. DUhTP mice are characterized by increased fat accumulation in the sedentary condition and elevated fat mobilization during mild voluntary physical activity. In the present study, the phenotype of fat cell browning of subcutaneous fat and a potential effect on oral glucose tolerance, an indicator of metabolic health, were addressed in DUhTP mice. Analysis of peripheral fat pads revealed increased brite (brown-in-white) subcutaneous adipose tissues and in subcutaneous fat from DUhTP mice higher levels of irisin and different markers of fat cell browning like T-box transcription factor (Tbx1), PPARα, and uncoupling protein (UCP1) (P < 0.05) when compared to unselected controls. UCP1 was further increased in subcutaneous fat from DUhTP mice in response to mild exercise (fourfold, P < 0.05). In addition, surface temperature of DUhTP mice was increased when compared to controls indicating a physiological effect of increased UCP1 expression. The present study suggests that DUhTP mice exhibit different markers of mitochondrial biogenesis and fat browning without external stimuli. At an age of 43 days, sedentary DUhTP mice have improved metabolic health as judged from lower levels of blood glucose after an oral glucose tolerance test. Consequently, the non-inbred mouse model DUhTP represents a novel model for the identification of fat cell browning mechanisms in white adipose tissues.
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Affiliation(s)
- J Brenmoehl
- Institute for Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - D Ohde
- Institute for Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - E Albrecht
- Institute for Muscle Biology and Growth, Leibniz-Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - C Walz
- Institute for Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - A Tuchscherer
- Institute for Biometry and Genetics, Leibniz-Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany
| | - A Hoeflich
- Institute for Genome Biology, Leibniz-Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196, Dummerstorf, Germany.
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96
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Gliemann L, Nyberg M, Hellsten Y. Effects of exercise training and resveratrol on vascular health in aging. Free Radic Biol Med 2016; 98:165-176. [PMID: 27085843 DOI: 10.1016/j.freeradbiomed.2016.03.037] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 03/16/2016] [Accepted: 03/30/2016] [Indexed: 01/06/2023]
Abstract
Cardiovascular disease is a leading cause of death in the western world with aging being one of the strongest predictors of cardiovascular events. Aging is associated with impaired vascular function due to endothelial dysfunction and altered redox balance, partly caused by an increased formation of reactive oxygen species combined with a reduction in the endogenous antioxidant capacity. The consequence of these alterations is a reduced bioavailability of nitric oxide (NO) with implications for aspects such as control of vascular tone and low grade inflammation. However, it is not only aging per se but also the accumulative influence of physical inactivity and other life-style factors, which negatively affect the vascular system. Regular physical activity improves NO bioavailability, the redox balance and the plasma lipid profile and, at a functional level, reduces or even reverses a majority of the observed detrimental effects of aging on vascular function. The effects of aging and physical activity on vascular function are, in part, related to alterations in cellular signaling through sirtuin-1, AMPK and the estrogen receptor. The polyphenol resveratrol can activate these same pathways and has, in animals and in vitro models, been shown to act as a partial mimetic of physical activity. However, support for beneficial effects of resveratrol in human is weak and studies even show that resveratrol supplementation, similarly to supplementation with other antioxidants, can counteract the positive effects of physical activity. Regular physical activity remains the most effective way of maintaining and improving vascular health status and caution should be taken regarding potential interference of supplements on training adaptations.
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Affiliation(s)
- Lasse Gliemann
- Department of Nutrition, Exercise and Sports, Section for Integrative Physiology, University of Copenhagen, Universitetsparken 13, DK-2100 Copenhagen Ø, Denmark
| | - Michael Nyberg
- Department of Nutrition, Exercise and Sports, Section for Integrative Physiology, University of Copenhagen, Universitetsparken 13, DK-2100 Copenhagen Ø, Denmark
| | - Ylva Hellsten
- Department of Nutrition, Exercise and Sports, Section for Integrative Physiology, University of Copenhagen, Universitetsparken 13, DK-2100 Copenhagen Ø, Denmark.
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97
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Di Meo S, Reed TT, Venditti P, Victor VM. Role of ROS and RNS Sources in Physiological and Pathological Conditions. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:1245049. [PMID: 27478531 PMCID: PMC4960346 DOI: 10.1155/2016/1245049] [Citation(s) in RCA: 751] [Impact Index Per Article: 93.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 05/04/2016] [Accepted: 05/23/2016] [Indexed: 12/19/2022]
Abstract
There is significant evidence that, in living systems, free radicals and other reactive oxygen and nitrogen species play a double role, because they can cause oxidative damage and tissue dysfunction and serve as molecular signals activating stress responses that are beneficial to the organism. Mitochondria have been thought to both play a major role in tissue oxidative damage and dysfunction and provide protection against excessive tissue dysfunction through several mechanisms, including stimulation of opening of permeability transition pores. Until recently, the functional significance of ROS sources different from mitochondria has received lesser attention. However, the most recent data, besides confirming the mitochondrial role in tissue oxidative stress and protection, show interplay between mitochondria and other ROS cellular sources, so that activation of one can lead to activation of other sources. Thus, it is currently accepted that in various conditions all cellular sources of ROS provide significant contribution to processes that oxidatively damage tissues and assure their survival, through mechanisms such as autophagy and apoptosis.
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Affiliation(s)
- Sergio Di Meo
- Dipartimento di Biologia, Università di Napoli “Federico II”, 80126 Napoli, Italy
| | - Tanea T. Reed
- Department of Chemistry, Eastern Kentucky University, Richmond, KY 40475, USA
| | - Paola Venditti
- Dipartimento di Biologia, Università di Napoli “Federico II”, 80126 Napoli, Italy
| | - Victor Manuel Victor
- Service of Endocrinology, University Hospital Dr. Peset, Foundation for the Promotion of Health and Biomedical Research in the Valencian Region (FISABIO), 46010 Valencia, Spain
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98
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Samuelsson H, Moberg M, Apró W, Ekblom B, Blomstrand E. Intake of branched-chain or essential amino acids attenuates the elevation in muscle levels of PGC-1α4 mRNA caused by resistance exercise. Am J Physiol Endocrinol Metab 2016; 311:E246-51. [PMID: 27245337 DOI: 10.1152/ajpendo.00154.2016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 05/28/2016] [Indexed: 11/22/2022]
Abstract
The transcriptional coactivator peroxisome proliferator-activated receptor-γ coactivator (PGC)-1α is recognized as the master regulator of mitochondrial biogenesis. However, recently a novel isoform, PGC-1α4, that specifically regulates muscle hypertrophy was discovered. Because stimulation of mechanistic target of rapamycin complex 1 (mTORC1) activity is tightly coupled to hypertrophy, we hypothesized that activation of this pathway would upregulate PGC-1α4. Eight male subjects performed heavy resistance exercise (10 × 8-12 repetitions at ∼75% of 1 repetition maximum in leg press) on four different occasions, ingesting in random order a solution containing essential amino acids (EAA), branched-chain amino acids (BCAA), leucine, or flavored water (placebo) during and after the exercise. Biopsies were taken from the vastus lateralis muscle before and immediately after exercise, as well as following 90 and 180 min of recovery. Signaling through mTORC1, as reflected in p70S6 kinase phosphorylation, was stimulated to a greater extent by the EAA and BCAA than the leucine or placebo supplements. Unexpectedly, intake of EAA or BCAA attenuated the stimulatory effect of exercise on PGC-1α4 expression by ∼50% (from a 10- to 5-fold increase with BCAA and EAA, P < 0.05) 3 h after exercise, whereas intake of leucine alone did not reduce this response. The 60% increase (P < 0.05) in the level of PGC-1α1 mRNA 90 min after exercise was uninfluenced by amino acid intake. Muscle glycogen levels were reduced and AMP-activated protein kinase α2 activity and phosphorylation of p38 mitogen-activated protein kinase enhanced to the same extent with all four supplements. In conclusion, induction of PGC-1α4 does not appear to regulate the nutritional (BCAA or EAA)-mediated activation of mTORC1 in human muscle.
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Affiliation(s)
- Hedvig Samuelsson
- The Åstrand Laboratory, The Swedish School of Sport and Health Sciences, Stockholm, Sweden; and
| | - Marcus Moberg
- The Åstrand Laboratory, The Swedish School of Sport and Health Sciences, Stockholm, Sweden; and
| | - William Apró
- The Åstrand Laboratory, The Swedish School of Sport and Health Sciences, Stockholm, Sweden; and
| | - Björn Ekblom
- The Åstrand Laboratory, The Swedish School of Sport and Health Sciences, Stockholm, Sweden; and
| | - Eva Blomstrand
- The Åstrand Laboratory, The Swedish School of Sport and Health Sciences, Stockholm, Sweden; and Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
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99
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Jeong HJ, Lee HJ, Vuong TA, Choi KS, Choi D, Koo SH, Cho SC, Cho H, Kang JS. Prmt7 Deficiency Causes Reduced Skeletal Muscle Oxidative Metabolism and Age-Related Obesity. Diabetes 2016; 65:1868-82. [PMID: 27207521 DOI: 10.2337/db15-1500] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 04/19/2016] [Indexed: 11/13/2022]
Abstract
Maintenance of skeletal muscle function is critical for metabolic health and the disruption of which exacerbates many chronic diseases such as obesity and diabetes. Skeletal muscle responds to exercise or metabolic demands by a fiber-type switch regulated by signaling-transcription networks that remains to be fully defined. Here, we report that protein arginine methyltransferase 7 (Prmt7) is a key regulator for skeletal muscle oxidative metabolism. Prmt7 is expressed at the highest levels in skeletal muscle and decreased in skeletal muscles with age or obesity. Prmt7(-/-) muscles exhibit decreased oxidative metabolism with decreased expression of genes involved in muscle oxidative metabolism, including PGC-1α. Consistently, Prmt7(-/-) mice exhibited significantly reduced endurance exercise capacities. Furthermore, Prmt7(-/-) mice exhibit decreased energy expenditure, which might contribute to the exacerbated age-related obesity of Prmt7(-/-) mice. Similarly to Prmt7(-/-) muscles, Prmt7 depletion in myoblasts also reduces PGC-1α expression and PGC-1α-promoter driven reporter activities. Prmt7 regulates PGC-1α expression through interaction with and activation of p38 mitogen-activated protein kinase (p38MAPK), which in turn activates ATF2, an upstream transcriptional activator for PGC-1α. Taken together, Prmt7 is a novel regulator for muscle oxidative metabolism via activation of p38MAPK/ATF2/PGC-1α.
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Affiliation(s)
- Hyeon-Ju Jeong
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, South Korea
| | - Hye-Jin Lee
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, South Korea
| | - Tuan Anh Vuong
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, South Korea
| | - Kyu-Sil Choi
- Samsung Biomedical Research Institute, Samsung Medical Center, Seoul, South Korea
| | - Dahee Choi
- Division of Life Science, Korea University, Seoul, South Korea
| | - Sung-Hoi Koo
- Division of Life Science, Korea University, Seoul, South Korea
| | - Sung Chun Cho
- Well Aging Research Center, Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd., Suwon, South Korea
| | - Hana Cho
- Department of Physiology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, South Korea
| | - Jong-Sun Kang
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Samsung Biomedical Research Institute, Suwon, South Korea
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100
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Revascularization and muscle adaptation to limb demand ischemia in diet-induced obese mice. J Surg Res 2016; 205:49-58. [PMID: 27620999 DOI: 10.1016/j.jss.2016.06.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/11/2016] [Accepted: 06/01/2016] [Indexed: 01/22/2023]
Abstract
BACKGROUND Obesity and type 2 diabetes are major risk factors for peripheral arterial disease in humans, which can result in lower limb demand ischemia and exercise intolerance. Exercise triggers skeletal muscle adaptation including increased vasculogenesis. The goal of this study was to determine whether demand ischemia modulates revascularization, fiber size, and signaling pathways in the ischemic hind limb muscles of mice with diet-induced obesity (DIO). MATERIALS AND METHODS DIO mice (n = 7) underwent unilateral femoral artery ligation and recovered for 2 wks followed by 4 wks with daily treadmill exercise to induce demand ischemia. A parallel sedentary ischemia (SI) group (n = 7) had femoral artery ligation without exercise. The contralateral limb muscles of SI served as control. Muscles were examined for capillary density, myofiber cross-sectional area, cytokine levels, and phosphorylation of STAT3 and ERK1/2. RESULTS Exercise significantly enhanced capillary density (P < 0.01) and markedly lowered cross-sectional area (P < 0.001) in demand ischemia compared with SI. These findings coincided with a significant increase in granulocyte colony-stimulating factor (P < 0.001) and interleukin-7 (P < 0.01) levels. In addition, phosphorylation levels of STAT3 and ERK1/2 (P < 0.01) were increased, whereas UCP1 and monocyte chemoattractant protein-1 protein levels were lower (P < 0.05) without altering vascular endothelial growth factor and tumor necrosis factor alpha protein levels. Demand ischemia increased the PGC1α messenger RNA (P < 0.001) without augmenting PGC1α protein levels. CONCLUSIONS Exercise-induced limb demand ischemia in the setting of DIO causes myofiber atrophy despite an increase in muscle capillary density. The combination of persistent increase in tumor necrosis factor alpha, lower vascular endothelial growth factor, and failure to increase PGC1α protein may reflect a deficient adaption to demand ischemia in DIO.
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