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Beaudry KM, Surdi JC, Pancevski K, Tremblay C, Devries MC. Greater glycemic control following low-load, high-repetition resistance exercise compared with moderate-intensity continuous exercise in males and females: a randomized control trial. Appl Physiol Nutr Metab 2024; 49:943-955. [PMID: 38518263 DOI: 10.1139/apnm-2023-0353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2024]
Abstract
Exercise has long been known for its beneficial effects on insulin sensitivity (IS) and glucose handling with both moderate-intensity continuous (MIC) exercise and resistance exercise (RE) inducing beneficial effects. In recent years, low-load, high-repetition (LLHR) RE has emerged as a strategy to increase muscle mass and strength to levels similar to traditional RE; however, the effects of LLHR RE on glucose handling has yet to be investigated. The purpose of this trial was to compare the acute effects of LLHR RE to MIC exercise on post-exercise glycemic control and insulin sensitivity in males and females. Twenty-four (n = 12/sex) participants completed acute bouts of MIC exercise (30 min at 65% V̇O₂peak) and LLHR (3 circuits, 6 exercises/circuit, 25-35 repetitions/exercise/circuit) matched for time with muscle biopsies immediately pre and post exercise and an oral glucose tolerance test (OGTT) 90 min following exercise. Blood glucose concentrations (p = 0.002, ηp 2 = 0.37), glucose AUC (p = 0.002, ηp 2 = 0.35) and max glucose concentration (p = 0.003, ηp 2 = 0.34) were lower during the post exercise OGTT following LLHR RE compared to MIC exercise. There was a main effect of trial on TBC1D1 Ser237 phosphorylation (p = 0.04, ηp 2 = 0.19) such that it was greater following MIC exercise compared to LLHR RE. Furthermore, phosphorylated ACC Ser79 increased following MIC exercise with no change following LLHR RE (p < 0.001, ηp 2 = 0.50). Phosphorylation of PTEN Ser380 was greater in males than females during LLHR RE (p = 0.01, ηp 2 = 0.27). These findings suggest that LLHR RE is a feasible exercise modality to improve post-exercise glycemic control in both males and females. Trial registration number: NCT06217679.
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Affiliation(s)
| | - Julian C Surdi
- Department of Kinesiology, University of Waterloo, Waterloo, Canada
| | | | - Cory Tremblay
- Department of Kinesiology, University of Waterloo, Waterloo, Canada
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2
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Zhang C, Li S, Li L, Wang R, Luo S, Li G. Stevioside Ameliorates Palmitic Acid-Induced Abnormal Glucose Uptake via the PDK4/AMPK/TBC1D1 Pathway in C2C12 Myotubes. Endocrinol Diabetes Metab 2024; 7:e00482. [PMID: 38556697 PMCID: PMC10982459 DOI: 10.1002/edm2.482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/04/2024] [Accepted: 03/05/2024] [Indexed: 04/02/2024] Open
Abstract
BACKGROUND Stevioside (SV) with minimal calories is widely used as a natural sweetener in beverages due to its high sweetness and safety. However, the effects of SV on glucose uptake and the pyruvate dehydrogenase kinase isoenzyme (PDK4) as an important protein in the regulation of glucose metabolism, remain largely unexplored. In this study, we used C2C12 skeletal muscle cells that was induced by palmitic acid (PA) to assess the effects and mechanisms of SV on glucose uptake and PDK4. METHODS The glucose uptake of C2C12 cells was determined by 2-NBDG; expression of the Pdk4 gene was measured by quantitative real-time PCR; and expression of the proteins PDK4, p-AMPK, TBC1D1 and GLUT4 was assessed by Western blotting. RESULTS In PA-induced C2C12 myotubes, SV could significantly promote cellular glucose uptake by decreasing PDK4 levels and increasing p-AMPK and TBC1D1 levels. SV could promote the translocation of GLUT4 from the cytoplasm to the cell membrane in cells. Moreover, in Pdk4-overexpressing C2C12 myotubes, SV decreased the level of PDK4 and increased the levels of p-AMPK and TBC1D1. CONCLUSION SV was found to ameliorate PA-induced abnormal glucose uptake via the PDK4/AMPK/TBC1D1 pathway in C2C12 myotubes. Although these results warranted further investigation for validation, they may provide some evidence of SV as a safe natural sweetener for its use in sugar-free beverages to prevent and control T2DM.
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Affiliation(s)
- Changfa Zhang
- Center for Clinical Epidemiology and Methodology (CCEM)Guangdong Second Provincial General HospitalGuangzhouChina
| | - Shuai Li
- Center for Clinical Epidemiology and Methodology (CCEM)Guangdong Second Provincial General HospitalGuangzhouChina
| | - Likang Li
- Center for Clinical Epidemiology and Methodology (CCEM)Guangdong Second Provincial General HospitalGuangzhouChina
| | - Ruoting Wang
- Center for Clinical Epidemiology and Methodology (CCEM)Guangdong Second Provincial General HospitalGuangzhouChina
| | - Shiming Luo
- Fertility Preservation Lab, Guangdong‐Hong Kong Metabolism and Reproduction Joint Laboratory, Reproductive Medicine CenterGuangdong Second Provincial General HospitalGuangzhouChina
| | - Guowei Li
- Center for Clinical Epidemiology and Methodology (CCEM)Guangdong Second Provincial General HospitalGuangzhouChina
- Department of Health Research Methods, Evidence, and Impact (HEI)McMaster UniversityHamiltonOntarioCanada
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3
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Arumugam TV, Alli-Shaik A, Liehn EA, Selvaraji S, Poh L, Rajeev V, Cho Y, Cho Y, Kim J, Kim J, Swa HLF, Hao DTZ, Rattanasopa C, Fann DYW, Mayan DC, Ng GYQ, Baik SH, Mallilankaraman K, Gelderblom M, Drummond GR, Sobey CG, Kennedy BK, Singaraja RR, Mattson MP, Jo DG, Gunaratne J. Multiomics analyses reveal dynamic bioenergetic pathways and functional remodeling of the heart during intermittent fasting. eLife 2023; 12:RP89214. [PMID: 37769126 PMCID: PMC10538958 DOI: 10.7554/elife.89214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2023] Open
Abstract
Intermittent fasting (IF) has been shown to reduce cardiovascular risk factors in both animals and humans, and can protect the heart against ischemic injury in models of myocardial infarction. However, the underlying molecular mechanisms behind these effects remain unclear. To shed light on the molecular and cellular adaptations of the heart to IF, we conducted comprehensive system-wide analyses of the proteome, phosphoproteome, and transcriptome, followed by functional analysis. Using advanced mass spectrometry, we profiled the proteome and phosphoproteome of heart tissues obtained from mice that were maintained on daily 12- or 16 hr fasting, every-other-day fasting, or ad libitum control feeding regimens for 6 months. We also performed RNA sequencing to evaluate whether the observed molecular responses to IF occur at the transcriptional or post-transcriptional levels. Our analyses revealed that IF significantly affected pathways that regulate cyclic GMP signaling, lipid and amino acid metabolism, cell adhesion, cell death, and inflammation. Furthermore, we found that the impact of IF on different metabolic processes varied depending on the length of the fasting regimen. Short IF regimens showed a higher correlation of pathway alteration, while longer IF regimens had an inverse correlation of metabolic processes such as fatty acid oxidation and immune processes. Additionally, functional echocardiographic analyses demonstrated that IF enhances stress-induced cardiac performance. Our systematic multi-omics study provides a molecular framework for understanding how IF impacts the heart's function and its vulnerability to injury and disease.
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Affiliation(s)
- Thiruma V Arumugam
- Centre for Cardiovascular Biology and Disease Research, Department of Microbiology, Anatomy, Physiology and Pharmacology, School of Agriculture, Biomedicine and Environment, La Trobe UniversityMelbourneAustralia
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
- School of Pharmacy, Sungkyunkwan UniversitySuwonRepublic of Korea
| | - Asfa Alli-Shaik
- Translational Biomedical Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and ResearchSingaporeSingapore
| | - Elisa A Liehn
- National Heart Research Institute, National Heart Centre SingaporeSingaporeSingapore
- Institute for Molecular Medicine, University of Southern DenmarkOdenseDenmark
- National Institute of Pathology "Victor Babes"BucharestRomania
| | - Sharmelee Selvaraji
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of SingaporeSingaporeSingapore
| | - Luting Poh
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - Vismitha Rajeev
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - Yoonsuk Cho
- School of Pharmacy, Sungkyunkwan UniversitySuwonRepublic of Korea
| | - Yongeun Cho
- School of Pharmacy, Sungkyunkwan UniversitySuwonRepublic of Korea
| | - Jongho Kim
- School of Pharmacy, Sungkyunkwan UniversitySuwonRepublic of Korea
| | - Joonki Kim
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
- Natural Products Research Center, Korea Institute of Science and TechnologyGangneungRepublic of Korea
| | - Hannah LF Swa
- Translational Biomedical Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and ResearchSingaporeSingapore
| | - David Tan Zhi Hao
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - Chutima Rattanasopa
- Translational Laboratories in Genetic Medicine, Agency for Science, Technology and ResearchSingaporeSingapore
- Cardiovascular and Metabolic Disorders Program, Duke-National University of SingaporeSingaporeSingapore
| | - David Yang-Wei Fann
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - David Castano Mayan
- Translational Laboratories in Genetic Medicine, Agency for Science, Technology and ResearchSingaporeSingapore
| | - Gavin Yong-Quan Ng
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - Sang-Ha Baik
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - Karthik Mallilankaraman
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - Mathias Gelderblom
- Department of Neurology, University Medical Center Hamburg-EppendorfHamburgGermany
| | - Grant R Drummond
- Centre for Cardiovascular Biology and Disease Research, Department of Microbiology, Anatomy, Physiology and Pharmacology, School of Agriculture, Biomedicine and Environment, La Trobe UniversityMelbourneAustralia
| | - Christopher G Sobey
- Centre for Cardiovascular Biology and Disease Research, Department of Microbiology, Anatomy, Physiology and Pharmacology, School of Agriculture, Biomedicine and Environment, La Trobe UniversityMelbourneAustralia
| | - Brian K Kennedy
- Department of Physiology, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
- Department of Biochemistry, Yong Loo Lin School Medicine, National University of SingaporeSingaporeSingapore
| | - Roshni R Singaraja
- Department of Medicine, Yong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
| | - Mark P Mattson
- Department of Neuroscience, Johns Hopkins University School of MedicineBaltimoreUnited States
| | - Dong-Gyu Jo
- School of Pharmacy, Sungkyunkwan UniversitySuwonRepublic of Korea
| | - Jayantha Gunaratne
- Translational Biomedical Proteomics Laboratory, Institute of Molecular and Cell Biology, Agency for Science, Technology and ResearchSingaporeSingapore
- Department of Anatomy, Yong Loo Lin School of Medicine, National University of SingaporeSingaporeSingapore
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4
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Chou CH, Barton ER. Phosphorylation of AMPKα at Ser485/491 Is Dependent on Muscle Contraction and Not Muscle-Specific IGF-I Overexpression. Int J Mol Sci 2023; 24:11950. [PMID: 37569325 PMCID: PMC10418898 DOI: 10.3390/ijms241511950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 08/13/2023] Open
Abstract
Glucose is an important fuel for highly active skeletal muscles. Increased adenosine monophosphate (AMP)/adenosine triphosphate (ATP) ratios during repetitive contractions trigger AMP-activated protein kinase (AMPK), indicated by phosphorylation of AMPKαThr172, which promotes glucose uptake to support heightened energy needs, but it also suppresses anabolic processes. Inhibition of AMPK can occur by protein kinase B (AKT)-mediated phosphorylation of AMPKαSer485/491, releasing its brake on growth. The influence of insulin-like growth factor I (IGF-I) on glucose uptake and its interplay with AMPK activation is not well understood. Thus, the goal of this study was to determine if increased muscle IGF-I altered AMPKα phosphorylation and activity during muscle contraction. Adult male mice harboring the rat Igf1a cDNA regulated by the fast myosin light chain promoter (mIgf1+/+) and wildtype littermates (WT) were used in the study. mIgf1+/+ mice had enhanced glucose tolerance and insulin-stimulated glucose uptake, but similar exercise capacity. Fatiguing stimulations of extensor digitorum longus (EDL) muscles resulted in upregulated AMPKα phosphorylation at both Thr172 and Ser485/491 in WT and mIgf1+/+ muscles. No differences in the phosphorylation response of the downstream AMPK target TBC1D1 were observed, but phosphorylation of raptor was significantly higher only in WT muscles. Further, total raptor content was elevated in mIgf1+/+ muscles. The results show that high muscle IGF-I can enhance glucose uptake under resting conditions; however, in contracting muscle, it is not sufficient to inhibit AMPK activity.
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Affiliation(s)
- Chih-Hsuan Chou
- Applied Physiology & Kinesiology, College of Health and Human Performance, University of Florida, Gainesville, FL 32611, USA;
- Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA
| | - Elisabeth R. Barton
- Applied Physiology & Kinesiology, College of Health and Human Performance, University of Florida, Gainesville, FL 32611, USA;
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Frankenberg NT, Mason SA, Wadley GD, Murphy RM. Skeletal muscle cell-specific differences in type 2 diabetes. Cell Mol Life Sci 2022; 79:256. [PMID: 35460430 PMCID: PMC9035013 DOI: 10.1007/s00018-022-04265-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 03/03/2022] [Accepted: 03/20/2022] [Indexed: 11/26/2022]
Abstract
Major stores of glucose are found as glycogen in skeletal muscle and liver. Skeletal muscle is a heterogenous tissue, with cellular metabolic and contractile distinctions dependent on whether the cell (fibre) is slow-twitch (Type I) or fast-twitch (Type II). We hypothesised that proteins important for glycogen metabolism would be differentially abundant between these diverse fibres. We further hypothesised that the cellular location of these proteins would be different in muscle samples between control (CON) and individuals with type 2 diabetes (T2D). We dissected individual muscle fibre segments from vastus lateralis skeletal muscle biopsy samples from CON and T2D and used cell-type-specific approaches to address muscle heterogeneity. We measured glycogen and glycogen-related proteins by immunoblotting techniques. A lower proportion of Type I fibres was found in muscle in T2D compared with CON. AMPK-β2, glycogen branching enzyme (GBE), glycogen debranching enzyme (GDE), and glycogen phosphorylase (GP) were differentially localized between fibre types and in fibres from CON and T2D individuals. A key novel finding was that the majority of glycogen is loosely bound or cytosolic in location in human skeletal muscle. The proportion of this diffusible pool of glycogen was significantly lower in Type I fibres in T2D compared to CON. A hyperinsulinaemic, euglycaemic clamp in people with type 2 diabetes had no effect on the proportion of diffusible glycogen. We identify cell-type as an important consideration when assessing glycogen metabolism in muscle. Our findings demonstrate varying glucose handling abilities in specific muscle fibre types in type 2 diabetes. A model is presented to provide an overview of the cell-specific differences in glycogen metabolism in type 2 diabetes.
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Affiliation(s)
- Noni T Frankenberg
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, 3086, Australia
| | - Shaun A Mason
- Institute for Physical Activity and Nutrition, Deakin University, Burwood, 3125, Australia
| | - Glenn D Wadley
- Institute for Physical Activity and Nutrition, Deakin University, Burwood, 3125, Australia
| | - Robyn M Murphy
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, School of Agriculture, Biomedicine and Environment, La Trobe University, Melbourne, 3086, Australia.
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6
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Radhakrishnan J, Baetiong A, Gazmuri RJ. Enhanced Oxygen Utilization Efficiency With Concomitant Activation of AMPK-TBC1D1 Signaling Nexus in Cyclophilin-D Conditional Knockout Mice. Front Physiol 2021; 12:756659. [PMID: 34955879 PMCID: PMC8692870 DOI: 10.3389/fphys.2021.756659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 11/12/2021] [Indexed: 12/02/2022] Open
Abstract
We have previously reported in HEK 293 T cells and in constitutive cyclophilin-D (Cyp-D) knockout (KO) mice that Cyp-D ablation downregulates oxygen consumption (VO2) and triggers an adaptive response that manifest in higher exercise endurance with less VO2. This adaptive response involves a metabolic switch toward preferential utilization of glucose via AMPK-TBC1D1 signaling nexus. We now investigated whether a similar response could be triggered in mice after acute ablation of Cyp-D using tamoxifen-induced ROSA26-Cre-mediated (i.e., conditional KO, CKO) by subjecting them to treadmill exercise involving five running sessions. At their first treadmill running session, CKO mice and controls had comparable VO2 (208.4 ± 17.9 vs. 209.1 ± 16.8 ml/kg min−1), VCO2 (183.6 ± 17.2 vs. 184.8 ± 16.9 ml/kg min−1), and RER (0.88 ± 0.043 vs. 0.88 ± 0.042). With subsequent sessions, CKO mice displayed more prominent reduction in VO2 (genotype & session interaction p = 0.000) with less prominent reduction in VCO2 resulting in significantly increased RER (genotype and session interaction p = 0.013). The increase in RER was consistent with preferential utilization of glucose as respiratory substrate (4.6 ± 0.8 vs. 4.0 ± 0.9 mg/min, p = 0.003). CKO mice also performed a significantly higher treadmill work for given VO2 expressed as a power/VO2 ratio (7.4 ± 0.2 × 10−3 vs. 6.7 ± 0.2 10−3 ratio, p = 0.025). Analysis of CKO skeletal muscle tissue after completion of five treadmill running sessions showed enhanced AMPK activation (0.669 ± 0.06 vs. 0.409 ± 0.11 pAMPK/β-tubulin ratio, p = 0.005) and TBC1D1 inactivation (0.877 ± 0.16 vs. 0.565 ± 0.09 pTBC1D1/β-tubulin ratio, p < 0.05) accompanied by increased glucose transporter-4 levels consistent with activation of the AMPK-TBC1D1 signaling nexus enabling increased glucose utilization. Taken together, our study demonstrates that like constitutive Cyp-D ablation, acute Cyp-D ablation also induces a state of increased O2 utilization efficiency, paving the way for exploring the use of pharmacological approach to elicit the same response, which could be beneficial under O2 limiting conditions.
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Affiliation(s)
- Jeejabai Radhakrishnan
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, IL, United States.,Department of Clinical Sciences, Rosalind Franklin University of Medicine and Science, North Chicago, IL, United States
| | - Alvin Baetiong
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, IL, United States
| | - Raúl J Gazmuri
- Resuscitation Institute, Rosalind Franklin University of Medicine and Science, North Chicago, IL, United States.,Department of Clinical Sciences, Rosalind Franklin University of Medicine and Science, North Chicago, IL, United States.,Captain James A. Lovell Federal Health Care Center, North Chicago, IL, United States
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7
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Pathways in Skeletal Muscle: Protein Signaling and Insulin Sensitivity after Exercise Training and Weight Loss Interventions in Middle-Aged and Older Adults. Cells 2021; 10:cells10123490. [PMID: 34943997 PMCID: PMC8700073 DOI: 10.3390/cells10123490] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 12/02/2021] [Accepted: 12/04/2021] [Indexed: 11/19/2022] Open
Abstract
Aging and obesity contribute to insulin resistance with skeletal muscle being critically important for maintaining whole-body glucose homeostasis. Both exercise and weight loss are lifestyle interventions that can affect glucose metabolism. The purpose of this study was to examine the effects of a six-month trial of aerobic exercise training or weight loss on signaling pathways in skeletal muscle in the basal condition and during hyperinsulinemia during a glucose clamp in middle-aged and older adults. Overweight and obese men and women aged 50–70 years were randomly allocated and completed six months of either weight loss (WL) (n = 18) or 3x/week aerobic exercise training (AEX) (n = 17). WL resulted in 10% weight loss and AEX increased maximal oxygen consumption (VO2max) (both p < 0.001). Insulin sensitivity (hyperinsulinemic-euglycemic 80 mU·m−2·min−1 clamp) increased in WL and AEX (both p < 0.01). In vivo insulin stimulation increased phosphorylation/total protein ratio (P/T) of protein kinase B (Akt), glycogen synthase kinase 3 beta (GSK-β3), 70 kDa ribosomal protein S6 kinase (p70S6k), insulin receptor substrate 1 (IRS-1), and insulin receptor (IR) expression (all p < 0.05) but not P/T extracellular regulated kinase ½ (ERK1/2), c-jun N-terminal kinases (JNK), p38 mitogen-activated protein kinases (p38), or insulin-like growth factor 1 receptor (IGF-1R). There were differences between WL and AEX in the change in basal Akt P/T (p = 0.05), GSK-3β P/T ratio (p < 0.01), p70S6k (p < 0.001), ERK1/2 (p = 0.01) P/T ratio but not p38, JNK, IRS-1, and IGF-1R P/T ratios. There was a difference between WL and AEX in the insulin stimulation changes in GSK3 which increased more after WL than AEX (p < 0.05). In the total group, changes in M were associated with changes in basal total GSK-3β and basal total p70Sk as well as insulin stimulation of total p70Sk. Protein signaling in skeletal muscle provides insight as to mechanisms for improvements in insulin sensitivity in aging and obesity.
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8
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Foudi N, Legeay S. Effects of physical activity on cell-to-cell communication during type 2 diabetes: A focus on miRNA signaling. Fundam Clin Pharmacol 2021; 35:808-821. [PMID: 33675090 DOI: 10.1111/fcp.12665] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 02/13/2021] [Accepted: 03/01/2021] [Indexed: 12/12/2022]
Abstract
Type 2 diabetes (TD2) is a progressive disease characterized by hyperglycemia that results from alteration in insulin secretion, insulin resistance, or both. A number of alterations involving different tissues and organs have been reported to the development and the progression of T2D, and more relevantly, through cell-to-cell communication pathways. Recent studies demonstrated that miRNAs are considerably implicated to cell-to-cell communication during T2D. Physical activity (PA) is associated with decreasing risks of developing T2D and acts as insulin-like factor. Cumulative evidence suggests that this effect could be mediated in part through improving insulin sensitivity in T2D and obese patients and modulating miRNAs synthesis and release in healthy patients. Therefore, the practice of PA should ideally be established before the initiation of T2D. This review describes cell-to-cell communications involved in the pathophysiology of T2D during PA.
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Affiliation(s)
- Nabil Foudi
- Department of Pharmacy, UNIV Angers, Angers, France.,Faculty of Medicine, Department of Pharmacy, University Ferhat Abbas Setif 1, Setif, Algeria
| | - Samuel Legeay
- MINT, UNIV Angers, INSERM 1066, CNRS 6021, IRIS-IBS-CHU, Angers, France
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9
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Iwasa M, Takezoe S, Kitaura N, Sutani T, Miyazaki H, Aoi W. A milk casein hydrolysate-derived peptide enhances glucose uptake through the AMP-activated protein kinase signalling pathway in skeletal muscle cells. Exp Physiol 2020; 106:496-505. [PMID: 33369793 DOI: 10.1113/ep088770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 12/14/2020] [Indexed: 12/18/2022]
Abstract
NEW FINDINGS What is the central question of this study? How do common active ingredients contained in both Lactobacillus helveticus-fermented milk and milk casein hydrolysate (MCH) enhance glucose metabolism by skeletal muscle? What is the main finding and its importance? MCH enhanced glucose uptake in skeletal muscle cells by stimulating AMP-activated kinase, but not insulin, signalling. Moreover, the MCH-derived specific peptide Ile-Pro-Pro mimicked this effect, suggesting a mechanism for MCH-induced metabolic improvement. ABSTRACT Improvement of glucose metabolism in the skeletal muscle has a key role in exercise performance and prevention of metabolic diseases. In our previous study, we showed that intake of milk casein hydrolysate improves glucose metabolism in humans, but the mechanism of action was not elucidated. In this study, we aimed to investigate the mechanism of action of milk casein hydrolysate and its derived peptides on glucose uptake and glucose metabolic signalling in cultured skeletal muscle cells. Differentiated C2C12 myotubes were used for the experiments. The differentiated cells were incubated with milk casein hydrolysate, valine-proline-proline and isoleucine-proline-proline. Subsequently, the rate of 2-deoxy-glucose uptake and the phosphorylation levels of insulin-dependent and -independent signalling factors were examined. We found that the rate of 2-deoxy-glucose uptake in both milk casein hydrolysate and isoleucine-proline-proline-treated cells was higher than that in the control cells. Immunoblotting assays showed that the phosphorylation levels of AMP-activated protein kinase, a rate-limiting factor in insulin-independent signalling, and of liver kinase B1, an upstream factor of AMP-activated protein kinase, in both milk casein hydrolysate and isoleucine-proline-proline-treated cells were higher than those in the control cells. Such significant effects were not observed after treatment with valine-proline-proline. Moreover, the insulin-dependent signalling was not significantly affected under the different conditions. The findings of our study suggest that milk casein hydrolysate enhances glucose uptake by activating insulin-independent AMP-activated protein kinase signalling in skeletal muscle cells, which might be mediated by a milk casein hydrolysate-derived peptide, namely, isoleucine-proline-proline.
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Affiliation(s)
- Masayo Iwasa
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Sakyo-ku, Kyoto, Japan.,Department of Food and Nutrition, Kyoto Kacho University, Higashiyama-ku, Kyoto, Japan
| | - Shiina Takezoe
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Sakyo-ku, Kyoto, Japan
| | - Naoko Kitaura
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Sakyo-ku, Kyoto, Japan
| | - Takatoshi Sutani
- Food Safety Laboratories, Asahi Quality & Innovations, Ltd, Moriya, Ibaraki, Japan
| | - Hidetoshi Miyazaki
- Core Technology Laboratories, Asahi Quality & Innovations, Ltd, Moriya, Ibaraki, Japan
| | - Wataru Aoi
- Division of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Sakyo-ku, Kyoto, Japan
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10
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Huang CC, Liu CC, Tsao JP, Hsu CL, Cheng IS. Effects of Oral Resveratrol Supplementation on Glycogen Replenishment and Mitochondria Biogenesis in Exercised Human Skeletal Muscle. Nutrients 2020; 12:nu12123721. [PMID: 33276518 PMCID: PMC7760965 DOI: 10.3390/nu12123721] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 11/28/2020] [Accepted: 11/29/2020] [Indexed: 12/11/2022] Open
Abstract
The present study aimed to investigate the effect of oral resveratrol supplementation on the key molecular gene expressions involved in mitochondria biogenesis and glycogen resynthesis in human skeletal muscle. Nine young male athletes participated in the single-blind and crossover designed study. All subjects completed a 4-day resveratrol and placebo supplement in a randomized order while performing a single bout of cycling exercise. Immediately after the exercise challenge, the subjects consumed a carbohydrate (CHO) meal (2 g CHO/Kg body mass) with either resveratrol or placebo capsules. Biopsied muscle samples, blood samples and expired gas samples were obtained at 0 h and 3 h after exercise. The muscle samples were measured for gene transcription factor expression by real-time PCR for glucose uptake and mitochondria biogenesis. Plasma glucose, insulin, glycerol, non-esterified fatty acid concentrations and respiratory exchange ratio were analyzed during post-exercise recovery periods. The results showed that the muscle glycogen concentrations were higher at 3 h than at 0 h; however, there were no difference between resveratrol trial and placebo trial. There were no significantly different concentrations in plasma parameters between the two trials. Similarly, no measured gene expressions were significant between the two trials. The evidence concluded that the 4-day oral resveratrol supplementation did not improve post-exercise muscle glycogen resynthesis and related glucose uptake and mitochondrial biosynthesis gene expression in men.
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Affiliation(s)
- Chun-Ching Huang
- Department of Exercise and Health Sciences, National Taipei University of Nursing and Health Science, Taipei City 112, Taiwan;
| | - Chia-Chen Liu
- Department of Physical Education, National Taichung University of Education, Taichung City 403, Taiwan; (C.-C.L.); (J.-P.T.)
| | - Jung-Piao Tsao
- Department of Physical Education, National Taichung University of Education, Taichung City 403, Taiwan; (C.-C.L.); (J.-P.T.)
| | - Chin-Lin Hsu
- Department of Nutrition, Chung Shan Medical University Hospital, Taichung 404, Taiwan
- School of Nutrition, Chung Shan Medical University, Taichung 404, Taiwan
- Correspondence: (C.-L.H.); (I.-S.C.); Tel.: +886-4-2218-3459 (I.-S.C.)
| | - I-Shiung Cheng
- Department of Physical Education, National Taichung University of Education, Taichung City 403, Taiwan; (C.-C.L.); (J.-P.T.)
- Correspondence: (C.-L.H.); (I.-S.C.); Tel.: +886-4-2218-3459 (I.-S.C.)
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11
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Holman GD. Structure, function and regulation of mammalian glucose transporters of the SLC2 family. Pflugers Arch 2020; 472:1155-1175. [PMID: 32591905 PMCID: PMC7462842 DOI: 10.1007/s00424-020-02411-3] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Revised: 05/27/2020] [Accepted: 05/29/2020] [Indexed: 12/12/2022]
Abstract
The SLC2 genes code for a family of GLUT proteins that are part of the major facilitator superfamily (MFS) of membrane transporters. Crystal structures have recently revealed how the unique protein fold of these proteins enables the catalysis of transport. The proteins have 12 transmembrane spans built from a replicated trimer substructure. This enables 4 trimer substructures to move relative to each other, and thereby alternately opening and closing a cleft to either the internal or the external side of the membrane. The physiological substrate for the GLUTs is usually a hexose but substrates for GLUTs can include urate, dehydro-ascorbate and myo-inositol. The GLUT proteins have varied physiological functions that are related to their principal substrates, the cell type in which the GLUTs are expressed and the extent to which the proteins are associated with subcellular compartments. Some of the GLUT proteins translocate between subcellular compartments and this facilitates the control of their function over long- and short-time scales. The control of GLUT function is necessary for a regulated supply of metabolites (mainly glucose) to tissues. Pathophysiological abnormalities in GLUT proteins are responsible for, or associated with, clinical problems including type 2 diabetes and cancer and a range of tissue disorders, related to tissue-specific GLUT protein profiles. The availability of GLUT crystal structures has facilitated the search for inhibitors and substrates and that are specific for each GLUT and that can be used therapeutically. Recent studies are starting to unravel the drug targetable properties of each of the GLUT proteins.
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Affiliation(s)
- Geoffrey D Holman
- Department of Biology and Biochemistry, University of Bath, Bath, BA2 7AY, UK.
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12
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Tobias IS, Lazauskas KK, Siu J, Costa PB, Coburn JW, Galpin AJ. Sex and fiber type independently influence AMPK, TBC1D1, and TBC1D4 at rest and during recovery from high-intensity exercise in humans. J Appl Physiol (1985) 2020; 128:350-361. [PMID: 31895596 DOI: 10.1152/japplphysiol.00704.2019] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Women and men present different metabolic responses to exercise, yet whether this phenomenon results from differences in fiber type (FT) composition or other sex-specific factors remains unclear. Therefore, our aim was to examine the effects of sex and FT independently on AMP-activated protein kinase (AMPK), acetyl-CoA carboxylase (ACC), Tre-2/BUB2/CDC1 domain family (TBC1D)1, and TBC1D4 in response to acute exercise. Segregated pools of myosin heavy chain (MHC) I and MHC IIa fibers were prepared from vastus lateralis biopsies of young trained men and women at rest and during recovery (0 min, 45 min, 90 min, or 180 min) from high-intensity interval exercise (6 × 1.5 min at 95% maximum oxygen uptake). In resting MHC I vs. IIa fibers, AMPKα2, AMPKγ3, and TBC1D1 were higher and TBC1D4 expression was lower in both sexes, along with higher phospho (p)-TBC1D1Ser660 and lower p-TBC1D4Thr642. Women expressed higher ACC than men in MHC IIa fibers and higher AMPKβ1, AMPKβ2, TBC1D1, and TBC1D4 in both FTs. Immediately after exercise, p-AMPKαThr172 increased only in MHC IIa fibers, whereas p-ACCSer221 increased in both FTs, with no change in p-TBC1D1Ser660 or p-TBC1D4Thr642. During recovery, delayed responses were observed for p-AMPKαThr172 in MHC I (45 min), p-TBC1D4Thr642 in both FTs (45 min), and p-TBC1D1Ser660 (180 min). FT-specific phosphorylation responses to exercise were similar between men and women. Data indicate that sex and FT independently influence expression of AMPK and its substrates. Thus failing to account for sex or FT may reduce accuracy and precision of metabolic protein measurements and conceal key findings.NEW & NOTEWORTHY This investigation is the first to compare muscle fiber type (FT)-specific analysis of proteins between the sexes, providing comprehensive data on AMP-activated protein kinase (AMPK), acetyl-CoA carboxylase (ACC), Tre-2/BUB2/CDC1 domain family (TBC1D)1, and TBC1D4 before and in the hours following high-intensity interval exercise (HIIT). Expression and phosphorylation of specific AMPK isoforms, ACC, TBC1D1, and TBC1D4 were shown to be FT dependent, sex dependent, or both, and TBC1D1 showed an unexpected delay in FT-dependent phosphorylation in the time period following HIIT.
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Affiliation(s)
- Irene S Tobias
- Biochemistry and Molecular Exercise Physiology Laboratory, Center for Sport Performance, California State University, Fullerton, California
| | - Kara K Lazauskas
- Biochemistry and Molecular Exercise Physiology Laboratory, Center for Sport Performance, California State University, Fullerton, California
| | - Jeremy Siu
- Biochemistry and Molecular Exercise Physiology Laboratory, Center for Sport Performance, California State University, Fullerton, California
| | - Pablo B Costa
- Biochemistry and Molecular Exercise Physiology Laboratory, Center for Sport Performance, California State University, Fullerton, California
| | - Jared W Coburn
- Biochemistry and Molecular Exercise Physiology Laboratory, Center for Sport Performance, California State University, Fullerton, California
| | - Andrew J Galpin
- Biochemistry and Molecular Exercise Physiology Laboratory, Center for Sport Performance, California State University, Fullerton, California
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13
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Odeh M, Tamir‐Livne Y, Haas T, Bengal E. P38α MAPK coordinates the activities of several metabolic pathways that together induce atrophy of denervated muscles. FEBS J 2019; 287:73-93. [DOI: 10.1111/febs.15070] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 05/30/2019] [Accepted: 09/18/2019] [Indexed: 12/11/2022]
Affiliation(s)
- Maali Odeh
- Department of Biochemistry Rappaport Faculty of Medicine Technion‐Israel Institute of Technology Haifa Israel
| | - Yael Tamir‐Livne
- Department of Biochemistry Rappaport Faculty of Medicine Technion‐Israel Institute of Technology Haifa Israel
| | - Tali Haas
- Pre‐Clinical Research Authority Technion‐Israel Institute of Technology Haifa Israel
| | - Eyal Bengal
- Department of Biochemistry Rappaport Faculty of Medicine Technion‐Israel Institute of Technology Haifa Israel
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14
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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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15
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Fu S, Meng Y, Zhang W, Wang J, He Y, Huang L, Chen H, Kuang J, Du H. Transcriptomic Responses of Skeletal Muscle to Acute Exercise in Diabetic Goto-Kakizaki Rats. Front Physiol 2019; 10:872. [PMID: 31338039 PMCID: PMC6629899 DOI: 10.3389/fphys.2019.00872] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 06/21/2019] [Indexed: 12/27/2022] Open
Abstract
Physical activity exerts positive effects on glycemic control in type 2 diabetes (T2D), which is mediated in part by extensive metabolic and molecular remodeling of skeletal muscle in response to exercise, while many regulators of skeletal muscle remain unclear. In the present study, we investigated the effects of acute exercise on skeletal muscle transcriptomic responses in the Goto-Kakizaki (GK) rats which can spontaneously develop T2D. The transcriptomes of skeletal muscle from both 8-week-old GK and Wistar rats that underwent a single exercise session (60 min running using an animal treadmill at 15 m/min) or remained sedentary were analyzed by next-generation RNA sequencing. We identified 819 differentially expressed genes in the sedentary GK rats compared with those of the sedentary Wistar rats. After a single bout of running, we found 291 and 598 genes that were differentially expressed in the exercise GK and exercise Wistar rats when compared with the corresponding sedentary rats. By integrating our data and previous studies including RNA or protein expression patterns and transgenic experiments, the downregulated expression of Fasn and upregulated expression of Tbc1d1, Hk2, Lpin1, Ppargc1a, Sorbs1, and Hmox1 might enhance glucose uptake or improve insulin sensitivity to ameliorate hyperglycemia in the exercise GK rats. Our results provide mechanistic insight into the beneficial effects of exercise on hyperglycemia and insulin action in skeletal muscle of diabetic GK rats.
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Affiliation(s)
- Shuying Fu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Yuhuan Meng
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Wenlu Zhang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Jiajian Wang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Yuting He
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Lizhen Huang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Hongmei Chen
- Department of Endocrinology, Guangdong General Hospital/Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Jian Kuang
- Department of Endocrinology, Guangdong General Hospital/Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Hongli Du
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
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16
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Overexpression of Interleukin-15 exhibits improved glucose tolerance and promotes GLUT4 translocation via AMP-Activated protein kinase pathway in skeletal muscle. Biochem Biophys Res Commun 2019; 509:994-1000. [DOI: 10.1016/j.bbrc.2019.01.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2018] [Accepted: 01/05/2019] [Indexed: 01/12/2023]
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17
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Hatakeyama H, Morino T, Ishii T, Kanzaki M. Cooperative actions of Tbc1d1 and AS160/Tbc1d4 in GLUT4-trafficking activities. J Biol Chem 2018; 294:1161-1172. [PMID: 30482843 DOI: 10.1074/jbc.ra118.004614] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 11/13/2018] [Indexed: 12/28/2022] Open
Abstract
AS160 and Tbc1d1 are key Rab GTPase-activating proteins (RabGAPs) that mediate release of static GLUT4 in response to insulin or exercise-mimetic stimuli, respectively, but their cooperative regulation and its underlying mechanisms remain unclear. By employing GLUT4 nanometry with cell-based reconstitution models, we herein analyzed the functional cooperative activities of the RabGAPs. When both RabGAPs are present, Tbc1d1 functionally dominates AS160, and stimuli-inducible GLUT4 release relies on Tbc1d1-evoking proximal stimuli, such as AICAR and intracellular Ca2+ Detailed functional assessments with varying expression ratios revealed that AS160 modulates sensitivity to external stimuli in Tbc1d1-mediated GLUT4 release. For example, Tbc1d1-governed GLUT4 release triggered by Ca2+ plus insulin occurred more efficiently than that in cells with little or no AS160. Series of mutational analyses revealed that these synergizing actions rely on the phosphotyrosine-binding 1 (PTB1) and calmodulin-binding domains of Tbc1d1 as well as key phosphorylation sites of both AS160 (Thr642) and Tbc1d1 (Ser237 and Thr596). Thus, the emerging cooperative governance relying on the multiple regulatory nodes of both Tbc1d1 and AS160, functioning together, plays a key role in properly deciphering biochemical signals into a physical GLUT4 release process in response to insulin, exercise, and the two in combination.
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Affiliation(s)
- Hiroyasu Hatakeyama
- Frontier Research Institute for Interdisciplinary Sciences, Sendai 980-8579, Japan; Graduate School of Biomedical Engineering, Sendai 980-8579, Japan
| | - Taisuke Morino
- Department of Information and Intelligent Systems, Tohoku University, Sendai 980-8579, Japan
| | - Takuya Ishii
- Department of Information and Intelligent Systems, Tohoku University, Sendai 980-8579, Japan
| | - Makoto Kanzaki
- Graduate School of Biomedical Engineering, Sendai 980-8579, Japan; Department of Information and Intelligent Systems, Tohoku University, Sendai 980-8579, Japan.
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18
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Wang H, Arias EB, Pataky MW, Goodyear LJ, Cartee GD. Postexercise improvement in glucose uptake occurs concomitant with greater γ3-AMPK activation and AS160 phosphorylation in rat skeletal muscle. Am J Physiol Endocrinol Metab 2018; 315:E859-E871. [PMID: 30130149 PMCID: PMC6293165 DOI: 10.1152/ajpendo.00020.2018] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A single exercise session can increase insulin-stimulated glucose uptake (GU) by skeletal muscle, concomitant with greater Akt substrate of 160 kDa (AS160) phosphorylation on Akt-phosphosites (Thr642 and Ser588) that regulate insulin-stimulated GU. Recent research using mouse skeletal muscle suggested that ex vivo 5-aminoimidazole-4-carboxamide ribonucleotide (AICAR) or electrically stimulated contractile activity-inducing increased γ3-AMPK activity and AS160 phosphorylation on a consensus AMPK-motif (Ser704) resulted in greater AS160 Thr642 phosphorylation and GU by insulin-stimulated muscle. Our primary goal was to determine whether in vivo exercise that increases insulin-stimulated GU in rat skeletal muscle would also increase γ3-AMPK activity and AS160 site-selective phosphorylation (Ser588, Thr642, and Ser704) immediately postexercise (IPEX) and/or 3 h postexercise (3hPEX). Epitrochlearis muscles isolated from sedentary and exercised (2-h swim exercise; studied IPEX and 3hPEX) rats were incubated with 2-deoxyglucose to determine GU (without insulin at IPEX; without or with insulin at 3hPEX). Muscles were also assessed for γ1-AMPK activity, γ3-AMPK activity, phosphorylated AMPK (pAMPK), and phosphorylated AS160 (pAS160). IPEX versus sedentary had greater γ3-AMPK activity, pAS160 (Ser588, Thr642, Ser704), and GU with unaltered γ1-AMPK activity. 3hPEX versus sedentary had greater γ3-AMPK activity, pAS160 Ser704, and GU with or without insulin; greater pAS160 Thr642 only with insulin; and unaltered γ1-AMPK activity. These results using an in vivo exercise protocol that increased insulin-stimulated GU in rat skeletal muscle are consistent with the hypothesis that in vivo exercise-induced enhancement of γ3-AMPK activation and AS160 Ser704 IPEX and 3hPEX are important for greater pAS160 Thr642 and enhanced insulin-stimulated GU by skeletal muscle.
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Affiliation(s)
- Haiyan Wang
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Edward B Arias
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Mark W Pataky
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
| | - Laurie J Goodyear
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School , Boston, Massachusetts
| | - Gregory D Cartee
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan , Ann Arbor, Michigan
- Department of Molecular and Integrative Physiology, University of Michigan , Ann Arbor, Michigan
- Institute of Gerontology, University of Michigan , Ann Arbor, Michigan
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19
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Mafakheri S, Flörke RR, Kanngießer S, Hartwig S, Espelage L, De Wendt C, Schönberger T, Hamker N, Lehr S, Chadt A, Al-Hasani H. AKT and AMP-activated protein kinase regulate TBC1D1 through phosphorylation and its interaction with the cytosolic tail of insulin-regulated aminopeptidase IRAP. J Biol Chem 2018; 293:17853-17862. [PMID: 30275018 DOI: 10.1074/jbc.ra118.005040] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 09/18/2018] [Indexed: 12/21/2022] Open
Abstract
In skeletal muscle, the Rab GTPase-activating (GAP) protein TBC1D1 is phosphorylated by AKT and AMP-activated protein kinase (AMPK) in response to insulin and muscle contraction. Genetic ablation of Tbc1d1 or mutation of distinct phosphorylation sites impairs intracellular GLUT4 retention and GLUT4 traffic, presumably through alterations of the activation state of downstream Rab GTPases. Previous studies have focused on characterizing the C-terminal GAP domain of TBC1D1 that lacks the known phosphorylation sites, as well as putative regulatory domains. As a result, it has been unclear how phosphorylation of TBC1D1 would regulate its activity. In the present study, we have expressed, purified, and characterized recombinant full-length TBC1D1 in Sf9 insect cells via the baculovirus system. Full-length TBC1D1 showed RabGAP activity toward GLUT4-associated Rab8a, Rab10, and Rab14, indicating similar substrate specificity as the truncated GAP domain. However, the catalytic activity of the full-length TBC1D1 was markedly higher than that of the GAP domain. Although in vitro phosphorylation of TBC1D1 by AKT or AMPK increased 14-3-3 binding, it did not alter the intrinsic RabGAP activity. However, we found that TBC1D1 interacts through its N-terminal PTB domains with the cytoplasmic domain of the insulin-regulated aminopeptidase, a resident protein of GLUT4 storage vesicles, and this binding is disrupted by phosphorylation of TBC1D1 by AKT or AMPK. In summary, our findings suggest that other regions outside the GAP domain may contribute to the catalytic activity of TBC1D1. Moreover, our data indicate that recruitment of TBC1D1 to GLUT4-containing vesicles and not its GAP activity is regulated by insulin and contraction-mediated phosphorylation.
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Affiliation(s)
- Samaneh Mafakheri
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Ralf R Flörke
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Sibylle Kanngießer
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf
| | - Sonja Hartwig
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Lena Espelage
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Christian De Wendt
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Tina Schönberger
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf
| | - Nele Hamker
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf
| | - Stefan Lehr
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Alexandra Chadt
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany
| | - Hadi Al-Hasani
- From the Institute of Clinical Biochemistry and Pathobiochemistry, German Diabetes Center, Leibniz Center for Diabetes Research at Heinrich Heine University, Medical Faculty, 40225 Düsseldorf; German Center for Diabetes Research (DZD), 85764 München-Neuherberg, Germany.
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20
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Rivas E, Herndon DN, Porter C, Meyer W, Suman OE. Short-term metformin and exercise training effects on strength, aerobic capacity, glycemic control, and mitochondrial function in children with burn injury. Am J Physiol Endocrinol Metab 2018; 314:E232-E240. [PMID: 29138224 PMCID: PMC5899215 DOI: 10.1152/ajpendo.00194.2017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Severely burned children experience a chronic state of sympathetic nervous system activation that is associated with hypermetabolic/cardiac stress and muscle wasting. Metformin, a diabetes medication, helps control hyperglycemia in obese diabetic populations, and exercise has been shown to improve exercise strength and aerobic exercise capacity after severe burns. However, whether exercise improves glycemic control in burned children and whether combining exercise and metformin improves outcomes to a greater degree than exercise alone are unknown. We tested the hypothesis that a 6-wk exercise program combined with short-term metformin administration (E + M) improves aerobic and strength exercise capacity to a greater degree than exercise and placebo (E), while improving glucose tolerance and muscle metabolic function. We found that, before exercise training, the metformin group compared with the placebo group had attenuated mitochondrial respiration (pmol·s-1·mg-1) for each state: state 2 (-22.5 ± 3), state 3 (-42.4 ± 13), and oxphos (-58.9 ± 19) ( P ≤ 0.02, M vs. E + M group for each state). However, in the E + M group, exercise increased mitochondrial respiration in each state ( P ≤ 0.05), with respiration being comparable to that in the E group (each P > 0.05). In both groups, exercise induced comparable improvements in strength (change from preexercise, Δ1.6 ± 0.6 N-M·kgLBM) and V̇o2peak (Δ9 ± 7 mlO2·kgLBM) as well as fasting glucose (Δ19.3 ± 13 mg·dl) and glucose AUC (Δ3402 ± 3674 mg·dl-1·min-1), as measured by a 75-g OGTT (all P ≤ 0.03). Exercise reduced resting energy expenditure in E + M (Δ539 ± 480 kcal/24 h, P < 0.01) but not E subjects ( P = 0.68). Both groups exhibited reduced resting heart rate (Δ30 ± 23 beats/min, P ≤ 0.02). These data indicate that short-term metformin combined with exercise provides no further improvement beyond that of exercise alone for strength, exercise capacity, and glycemic control.
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Affiliation(s)
- Eric Rivas
- Shriners Hospitals for Children, Galveston, Texas
- Department of Surgery, University of Texas Medical Branch , Galveston, Texas
- Department of Kinesiology and Sport Management, Texas Tech University , Lubbock, Texas
| | - David N Herndon
- Shriners Hospitals for Children, Galveston, Texas
- Department of Surgery, University of Texas Medical Branch , Galveston, Texas
| | - Craig Porter
- Shriners Hospitals for Children, Galveston, Texas
- Department of Surgery, University of Texas Medical Branch , Galveston, Texas
| | - Walter Meyer
- Shriners Hospitals for Children, Galveston, Texas
- Department of Surgery, University of Texas Medical Branch , Galveston, Texas
| | - Oscar E Suman
- Shriners Hospitals for Children, Galveston, Texas
- Department of Surgery, University of Texas Medical Branch , Galveston, Texas
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21
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Trewin AJ, Levinger I, Parker L, Shaw CS, Serpiello FR, Anderson MJ, McConell GK, Hare DL, Stepto NK. Acute exercise alters skeletal muscle mitochondrial respiration and H2O2 emission in response to hyperinsulinemic-euglycemic clamp in middle-aged obese men. PLoS One 2017; 12:e0188421. [PMID: 29161316 PMCID: PMC5697830 DOI: 10.1371/journal.pone.0188421] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Accepted: 11/07/2017] [Indexed: 12/16/2022] Open
Abstract
Obesity, sedentary lifestyle and aging are associated with mitochondrial dysfunction and impaired insulin sensitivity. Acute exercise increases insulin sensitivity in skeletal muscle; however, whether mitochondria are involved in these processes remains unclear. The aim of this study was to investigate the effects of insulin stimulation at rest and after acute exercise on skeletal muscle mitochondrial respiratory function (JO2) and hydrogen peroxide emission (JH2O2), and the associations with insulin sensitivity in obese, sedentary men. Nine men (means ± SD: 57 ± 6 years; BMI 33 ± 5 kg.m2) underwent hyperinsulinemic-euglycemic clamps in two separate trials 1–3 weeks apart: one under resting conditions, and another 1 hour after high-intensity exercise (4x4 min cycling at 95% HRpeak). Muscle biopsies were obtained at baseline, and pre/post clamp to measure JO2 with high-resolution respirometry and JH2O2 via Amplex UltraRed from permeabilized fibers. Post-exercise, both JO2 and JH2O2 during ADP stimulated state-3/OXPHOS respiration were lower compared to baseline (P<0.05), but not after subsequent insulin stimulation. JH2O2 was lower post-exercise and after subsequent insulin stimulation compared to insulin stimulation in the rest trial during succinate supported state-4/leak respiration (P<0.05). In contrast, JH2O2 increased during complex-I supported leak respiration with insulin after exercise compared with resting conditions (P<0.05). Resting insulin sensitivity and JH2O2 during complex-I leak respiration were positively correlated (r = 0.77, P<0.05). We conclude that in obese, older and sedentary men, acute exercise modifies skeletal muscle mitochondrial respiration and H2O2 emission responses to hyperinsulinemia in a respiratory state-specific manner, which may have implications for metabolic diseases involving insulin resistance.
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Affiliation(s)
- Adam J. Trewin
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
| | - Itamar Levinger
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
- Australian Institute for Musculoskeletal Science (AIMSS), Victoria University, St. Albans, Australia
| | - Lewan Parker
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | - Christopher S. Shaw
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | - Fabio R. Serpiello
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
| | - Mitchell J. Anderson
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
| | - Glenn K. McConell
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
| | - David L. Hare
- University of Melbourne, and Department of Cardiology, Austin Health, Melbourne, Australia
| | - Nigel K. Stepto
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Australia
- Australian Institute for Musculoskeletal Science (AIMSS), Victoria University, St. Albans, Australia
- Monash Centre for Health Research and Implementation (MCHRI), Monash University and Monash Health, Clayton, Australia
- * E-mail:
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22
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Kjøbsted R, Wojtaszewski JFP, Treebak JT. Role of AMP-Activated Protein Kinase for Regulating Post-exercise Insulin Sensitivity. ACTA ACUST UNITED AC 2017; 107:81-126. [PMID: 27812978 DOI: 10.1007/978-3-319-43589-3_5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Skeletal muscle insulin resistance precedes development of type 2 diabetes (T2D). As skeletal muscle is a major sink for glucose disposal, understanding the molecular mechanisms involved in maintaining insulin sensitivity of this tissue could potentially benefit millions of people that are diagnosed with insulin resistance. Regular physical activity in both healthy and insulin-resistant individuals is recognized as the single most effective intervention to increase whole-body insulin sensitivity and thereby positively affect glucose homeostasis. A single bout of exercise has long been known to increase glucose disposal in skeletal muscle in response to physiological insulin concentrations. While this effect is identified to be restricted to the previously exercised muscle, the molecular basis for an apparent convergence between exercise- and insulin-induced signaling pathways is incompletely known. In recent years, we and others have identified the Rab GTPase-activating protein, TBC1 domain family member 4 (TBC1D4) as a target of key protein kinases in the insulin- and exercise-activated signaling pathways. Our working hypothesis is that the AMP-activated protein kinase (AMPK) is important for the ability of exercise to insulin sensitize skeletal muscle through TBC1D4. Here, we aim to provide an overview of the current available evidence linking AMPK to post-exercise insulin sensitivity.
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Affiliation(s)
- Rasmus Kjøbsted
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Integrative Physiology, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3b, 2200, Copenhagen, Denmark
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Jørgen F P Wojtaszewski
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, 2100, Copenhagen, Denmark
| | - Jonas T Treebak
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Integrative Physiology, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3b, 2200, Copenhagen, Denmark.
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23
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Enriori PJ, Chen W, Garcia-Rudaz MC, Grayson BE, Evans AE, Comstock SM, Gebhardt U, Müller HL, Reinehr T, Henry BA, Brown RD, Bruce CR, Simonds SE, Litwak SA, McGee SL, Luquet S, Martinez S, Jastroch M, Tschöp MH, Watt MJ, Clarke IJ, Roth CL, Grove KL, Cowley MA. α-Melanocyte stimulating hormone promotes muscle glucose uptake via melanocortin 5 receptors. Mol Metab 2016; 5:807-822. [PMID: 27688995 PMCID: PMC5034615 DOI: 10.1016/j.molmet.2016.07.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Revised: 07/26/2016] [Accepted: 07/28/2016] [Indexed: 01/21/2023] Open
Abstract
Objective Central melanocortin pathways are well-established regulators of energy balance. However, scant data exist about the role of systemic melanocortin peptides. We set out to determine if peripheral α-melanocyte stimulating hormone (α-MSH) plays a role in glucose homeostasis and tested the hypothesis that the pituitary is able to sense a physiological increase in circulating glucose and responds by secreting α-MSH. Methods We established glucose-stimulated α-MSH secretion using humans, non-human primates, and mouse models. Continuous α-MSH infusions were performed during glucose tolerance tests and hyperinsulinemic-euglycemic clamps to evaluate the systemic effect of α-MSH in glucose regulation. Complementary ex vivo and in vitro techniques were employed to delineate the direct action of α-MSH via the melanocortin 5 receptor (MC5R)–PKA axis in skeletal muscles. Combined treatment of non-selective/selective phosphodiesterase inhibitor and α-MSH was adopted to restore glucose tolerance in obese mice. Results Here we demonstrate that pituitary secretion of α-MSH is increased by glucose. Peripheral α-MSH increases temperature in skeletal muscles, acts directly on soleus and gastrocnemius muscles to significantly increase glucose uptake, and enhances whole-body glucose clearance via the activation of muscle MC5R and protein kinase A. These actions are absent in obese mice, accompanied by a blunting of α-MSH-induced cAMP levels in skeletal muscles of obese mice. Both selective and non-selective phosphodiesterase inhibition restores α-MSH induced skeletal muscle glucose uptake and improves glucose disposal in obese mice. Conclusion These data describe a novel endocrine circuit that modulates glucose homeostasis by pituitary α-MSH, which increases muscle glucose uptake and thermogenesis through the activation of a MC5R-PKA-pathway, which is disrupted in obesity. Glucose stimulates α-MSH release from the pituitary. Systemic α-MSH drives glucose disposal and thermogenesis in skeletal muscles. α-MSH acts on MC5R expressed on skeletal muscles and activate cAMP-PKA pathway. The combined treatment of nonselective or selective PDE 4 inhibitor and α-MSH ameliorates glucose intolerance in obese mice.
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Affiliation(s)
- Pablo J Enriori
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Weiyi Chen
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Maria C Garcia-Rudaz
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | | | - Anne E Evans
- Division Neuroscience, Oregon Health and Science University, Oregon, USA
| | - Sarah M Comstock
- Division Neuroscience, Oregon Health and Science University, Oregon, USA
| | - Ursel Gebhardt
- Department of Pediatrics, Vestische Children Hospital Datteln, University of Witten/Herdecke, Germany
| | - Hermann L Müller
- Department of Pediatrics, Vestische Children Hospital Datteln, University of Witten/Herdecke, Germany
| | - Thomas Reinehr
- Department of Pediatrics, Klinikum Oldenburg GmbH, Germany
| | - Belinda A Henry
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Russell D Brown
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Clinton R Bruce
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Stephanie E Simonds
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Sara A Litwak
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Sean L McGee
- Metabolic Research Unit, School of Medicine, Deakin University, Vic, Australia
| | - Serge Luquet
- Univ Paris Diderot, Sorbonne Paris Cité, Unité de Biologie Fonctionnelle et Adaptative, CNRS UMR 8251, F-75205 Paris, France
| | - Sarah Martinez
- Univ Paris Diderot, Sorbonne Paris Cité, Unité de Biologie Fonctionnelle et Adaptative, CNRS UMR 8251, F-75205 Paris, France
| | - Martin Jastroch
- Institute for Diabetes and Obesity, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg & Division of Metabolic Diseases, Technische Universität, München, Germany
| | - Matthias H Tschöp
- Institute for Diabetes and Obesity, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg & Division of Metabolic Diseases, Technische Universität, München, Germany
| | - Matthew J Watt
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Iain J Clarke
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia
| | - Christian L Roth
- Division of Endocrinology, Seattle Children's Hospital Research Institute, WA, USA
| | - Kevin L Grove
- Division Neuroscience, Oregon Health and Science University, Oregon, USA
| | - Michael A Cowley
- Biomedical Discovery Institute/Department of Physiology, Monash University, Vic, Australia.
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24
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Andreozzi F, Raciti GA, Nigro C, Mannino GC, Procopio T, Davalli AM, Beguinot F, Sesti G, Miele C, Folli F. The GLP-1 receptor agonists exenatide and liraglutide activate Glucose transport by an AMPK-dependent mechanism. J Transl Med 2016; 14:229. [PMID: 27473212 PMCID: PMC4967343 DOI: 10.1186/s12967-016-0985-7] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 07/20/2016] [Indexed: 01/11/2023] Open
Abstract
Aims/hypothesis Potentiation of glucose-induced insulin secretion is the main mechanism of exenatide (EXE) antidiabetic action, however, increased glucose utilization by peripheral tissues has been also reported. We here studied the effect of EXE on glucose uptake by skeletal muscle cells. Methods 2-deoxy-glucose (2DG) uptake and intracellular signal pathways were measured in rat L6 skeletal muscle myotubes exposed to 100 nmol/l EXE for up to 48 h. Mechanisms of EXE action were explored by inhibiting AMPK activity with compound C (CC, 40 μmol/l) or siRNAs (2 μmol/l). Results Time course experiments show that EXE increases glucose uptake up to 48 h achieving its maximal effect, similar to that induced by insulin, after 20 min (2- vs 2.5-fold-increase, respectively). Differently from insulin, EXE does not stimulate: (i) IR β-subunit- and IRS1 tyrosine phosphorylation and binding to p85 regulatory subunit of PI-3kinase; (ii) AKT activation; and (iii) ERK1/2 and JNK1/2 phosphorylation. Conversely, EXE increases phosphorylation of α-subunit of AMPK at Thr172 by 2.5-fold (p < 0.01). Co-incubation of EXE and insulin does not induce additive effects on 2DG-uptake. Inhibition of AMPK with CC, and reduction of AMPK protein expression by siRNA, completely abolish EXE-induced 2DG-uptake. Liraglutide, another GLP-1 receptor agonist, also stimulates AMPK phosphorylation and 2DG-uptake. Moreover, EXE stimulates 2DG-uptake also by L6 myotubes rendered insulin-resistant with methylglyoxal. Finally, EXE also induces glucose transporter Glut-4 translocation to the plasma membrane. Conclusions/interpretation In L6 myotubes, EXE and liraglutide increase glucose uptake in an insulin-independent manner by activating AMPK. Electronic supplementary material The online version of this article (doi:10.1186/s12967-016-0985-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Francesco Andreozzi
- Department of Medical and Surgical Sciences, University of Catanzaro "Magna-Graecia", Catanzaro, Italy. .,Division of Diabetes, Department of Medicine, University of Texas Health Science Center, San Antonio, TX, USA.
| | - Gregory Alexander Raciti
- Institute of Experimental Endocrinology and Oncology "G. Salvatore", National Council of Research, Naples, Italy.,Department of Translational Medical Sciences, University of Naples "Federico II", Naples, Italy
| | - Cecilia Nigro
- Institute of Experimental Endocrinology and Oncology "G. Salvatore", National Council of Research, Naples, Italy.,Department of Translational Medical Sciences, University of Naples "Federico II", Naples, Italy
| | - Gaia Chiara Mannino
- Department of Medical and Surgical Sciences, University of Catanzaro "Magna-Graecia", Catanzaro, Italy
| | - Teresa Procopio
- Department of Medical and Surgical Sciences, University of Catanzaro "Magna-Graecia", Catanzaro, Italy
| | - Alberto M Davalli
- Department of Medicine Endocrinology Unit, Ospedale San Raffaele, Milan, Italy
| | - Francesco Beguinot
- Institute of Experimental Endocrinology and Oncology "G. Salvatore", National Council of Research, Naples, Italy.,Department of Translational Medical Sciences, University of Naples "Federico II", Naples, Italy
| | - Giorgio Sesti
- Department of Medical and Surgical Sciences, University of Catanzaro "Magna-Graecia", Catanzaro, Italy
| | - Claudia Miele
- Institute of Experimental Endocrinology and Oncology "G. Salvatore", National Council of Research, Naples, Italy.,Department of Translational Medical Sciences, University of Naples "Federico II", Naples, Italy
| | - Franco Folli
- Division of Diabetes, Department of Medicine, University of Texas Health Science Center, San Antonio, TX, USA. .,Department of Internal Medicine, University of Campinas, Campinas, SP, Brazil.
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25
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Hong YH, Yang C, Betik AC, Lee-Young RS, McConell GK. Skeletal muscle glucose uptake during treadmill exercise in neuronal nitric oxide synthase-μ knockout mice. Am J Physiol Endocrinol Metab 2016; 310:E838-45. [PMID: 27006199 DOI: 10.1152/ajpendo.00513.2015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Accepted: 03/17/2016] [Indexed: 11/22/2022]
Abstract
Nitric oxide influences intramuscular signaling that affects skeletal muscle glucose uptake during exercise. The role of the main NO-producing enzyme isoform activated during skeletal muscle contraction, neuronal nitric oxide synthase-μ (nNOSμ), in modulating glucose uptake has not been investigated in a physiological exercise model. In this study, conscious and unrestrained chronically catheterized nNOSμ(+/+) and nNOSμ(-/-) mice either remained at rest or ran on a treadmill at 17 m/min for 30 min. Both groups of mice demonstrated similar exercise capacity during a maximal exercise test to exhaustion (17.7 ± 0.6 vs. 15.9 ± 0.9 min for nNOSμ(+/+) and nNOSμ(-/-), respectively, P > 0.05). Resting and exercise blood glucose levels were comparable between the genotypes. Very low levels of NOS activity were detected in skeletal muscle from nNOSμ(-/-) mice, and exercise increased NOS activity only in nNOSμ(+/+) mice (4.4 ± 0.3 to 5.2 ± 0.4 pmol·mg(-1)·min(-1), P < 0.05). Exercise significantly increased glucose uptake in gastrocnemius muscle (5- to 7-fold) and, surprisingly, more so in nNOSμ(-/-) than in nNOSμ(+/+) mice (P < 0.05). This is in parallel with a greater increase in AMPK phosphorylation during exercise in nNOSμ(-/-) mice. In conclusion, nNOSμ is not essential for skeletal muscle glucose uptake during exercise, and the higher skeletal muscle glucose uptake during exercise in nNOSμ(-/-) mice may be due to compensatory increases in AMPK activation.
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Affiliation(s)
- Yet Hoi Hong
- College of Health and Biomedicine, Victoria University, Melbourne, Victoria, Australia; Clinical Exercise Science Program, Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia; Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia; and
| | - Christine Yang
- Cellular and Molecular Metabolism, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Andrew C Betik
- College of Health and Biomedicine, Victoria University, Melbourne, Victoria, Australia; Clinical Exercise Science Program, Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia
| | - Robert S Lee-Young
- Cellular and Molecular Metabolism, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Glenn K McConell
- College of Health and Biomedicine, Victoria University, Melbourne, Victoria, Australia; Clinical Exercise Science Program, Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia
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26
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Rivas E, Wooten JS, Newmire DE, Ben-Ezra V. Omega-3 fatty acid supplementation combined with acute aerobic exercise does not alter the improved post-exercise insulin response in normoglycemic, inactive and overweight men. Eur J Appl Physiol 2016; 116:1255-65. [PMID: 27155848 DOI: 10.1007/s00421-016-3387-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 05/01/2016] [Indexed: 12/16/2022]
Abstract
PURPOSE The aim of this study was to determine if omega-3 (n-3) supplementation combined with acute aerobic exercise would improve glucose and insulin responses in normoglycemic, inactive, overweight men. METHODS In a random order, ten inactive and normoglycemic men (30.6 ± 10 years, 85.4 ± 11 kg, 26.7 ± 4 BMI) completed a rest (R) and exercise trial (EX) without n-3 supplementation. Following 42 days of n-3 supplementation, participants again completed a rest (R + n-3) and exercise trial (EX + n-3) with continued n-3 supplementation. The exercise trial consisted of 3 days of ~70 % VO2peak for 60 min/session. N-3 supplementation entailed 4.55 g/day of n-3 (EPA 2.45 g, DHA 1.61 g). A 75 g oral glucose tolerance (OGTT) test was administered 14-16 h after each trial. RESULTS Relative to R (35,278 ± 9169 pmol/L), EX without n-3 reduced the incremental area under the curve for insulin (iAUCinsulin) during an OGTT by 21.3 % (27765 ± 4925 pmol/L, p = 0.018) and 20.6 % after the EX + n-3 trial (27,999 ± 8370 pmol/L; p = 0.007). In addition, EX (96 ± 21 pmol/L; p = 0.006) reduced C-peptide by 13.5 % when compared to R (111 ± 26 pmol/L). No difference was observed between R and n-3 trials for iAUCinsulin and iAUCC-peptide. Only EX improved insulin sensitivity index by 5.6 % (p = 0.02) when compared to R. CONCLUSIONS These data suggest that n-3 supplementation does not add any additional benefit beyond the exercise induced insulin responses in inactive men. Furthermore, n-3 supplementation alone does not appear to impair insulin action in normoglycemic, inactive, overweight men.
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Affiliation(s)
- Eric Rivas
- Exercise Physiology and Biochemistry Laboratory, Department of Kinesiology, Texas Woman's University, Denton, TX, USA. .,Institute for Clinical and Translational Science & Department of Pediatrics, The University of California, Irvine, CA, USA.
| | - Joshua S Wooten
- Department of Kinesiology and Health Education, Southern Illinois University Edwardsville, Edwardsville, IL, USA
| | - Daniel E Newmire
- Exercise Physiology and Biochemistry Laboratory, Department of Kinesiology, Texas Woman's University, Denton, TX, USA
| | - Vic Ben-Ezra
- Exercise Physiology and Biochemistry Laboratory, Department of Kinesiology, Texas Woman's University, Denton, TX, USA
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27
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Kjøbsted R, Pedersen AJT, Hingst JR, Sabaratnam R, Birk JB, Kristensen JM, Højlund K, Wojtaszewski JFP. Intact Regulation of the AMPK Signaling Network in Response to Exercise and Insulin in Skeletal Muscle of Male Patients With Type 2 Diabetes: Illumination of AMPK Activation in Recovery From Exercise. Diabetes 2016; 65:1219-30. [PMID: 26822091 DOI: 10.2337/db15-1034] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Accepted: 01/16/2016] [Indexed: 11/13/2022]
Abstract
Current evidence on exercise-mediated AMPK regulation in skeletal muscle of patients with type 2 diabetes (T2D) is inconclusive. This may relate to inadequate segregation of trimeric complexes in the investigation of AMPK activity. We examined the regulation of AMPK and downstream targets ACC-β, TBC1D1, and TBC1D4 in muscle biopsy specimens obtained from 13 overweight/obese patients with T2D and 14 weight-matched male control subjects before, immediately after, and 3 h after exercise. Exercise increased AMPK α2β2γ3 activity and phosphorylation of ACCβ Ser(221), TBC1D1 Ser(237)/Thr(596), and TBC1D4 Ser(704) Conversely, exercise decreased AMPK α1β2γ1 activity and TBC1D4 Ser(318)/Thr(642) phosphorylation. Interestingly, compared with preexercise, 3 h into exercise recovery, AMPK α2β2γ1 and α1β2γ1 activity were increased concomitant with increased TBC1D4 Ser(318)/Ser(341)/Ser(704) phosphorylation. No differences in these responses were observed between patients with T2D and control subjects. Subjects were also studied by euglycemic-hyperinsulinemic clamps performed at rest and 3 h after exercise. We found no evidence for insulin to regulate AMPK activity. Thus, AMPK signaling is not compromised in muscle of patients with T2D during exercise and insulin stimulation. Our results reveal a hitherto unrecognized activation of specific AMPK complexes in exercise recovery. We hypothesize that the differential regulation of AMPK complexes plays an important role for muscle metabolism and adaptations to exercise.
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Affiliation(s)
- Rasmus Kjøbsted
- Section of Molecular Physiology, August Krogh Centre, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | | | - Janne R Hingst
- Section of Molecular Physiology, August Krogh Centre, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Rugivan Sabaratnam
- Department of Endocrinology, Odense University Hospital, Odense, Denmark Section of Molecular Diabetes and Metabolism, Institute of Molecular Medicine and Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Jesper B Birk
- Section of Molecular Physiology, August Krogh Centre, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Jonas M Kristensen
- Department of Endocrinology, Odense University Hospital, Odense, Denmark Section of Molecular Diabetes and Metabolism, Institute of Molecular Medicine and Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Kurt Højlund
- Department of Endocrinology, Odense University Hospital, Odense, Denmark Section of Molecular Diabetes and Metabolism, Institute of Molecular Medicine and Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Jørgen F P Wojtaszewski
- Section of Molecular Physiology, August Krogh Centre, Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
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28
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Trewin AJ, Lundell LS, Perry BD, Patil KV, Chibalin AV, Levinger I, McQuade LR, Stepto NK. Effect of N-acetylcysteine infusion on exercise-induced modulation of insulin sensitivity and signaling pathways in human skeletal muscle. Am J Physiol Endocrinol Metab 2015; 309:E388-97. [PMID: 26105008 DOI: 10.1152/ajpendo.00605.2014] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 06/16/2015] [Indexed: 01/10/2023]
Abstract
-Reactive oxygen species (ROS) produced in skeletal muscle may play a role in potentiating the beneficial responses to exercise; however, the effects of exercise-induced ROS on insulin action and protein signaling in humans has not been fully elucidated. Seven healthy, recreationally active participants volunteered for this double-blind, randomized, repeated-measures crossover study. Exercise was undertaken with infusion of saline (CON) or the antioxidant N-acetylcysteine (NAC) to attenuate ROS. Participants performed two 1-h cycling exercise sessions 7-14 days apart, 55 min at 65% V̇o2peak plus 5 min at 85%V̇o2peak, followed 3 h later by a 2-h hyperinsulinemic euglycemic clamp (40 mIU·min(-1)·m(2)) to determine insulin sensitivity. Four muscle biopsies were taken on each trial day, at baseline before NAC infusion (BASE), after exercise (EX), after 3-h recovery (REC), and post-insulin clamp (PI). Exercise, ROS, and insulin action on protein phosphorylation were evaluated with immunoblotting. NAC tended to decrease postexercise markers of the ROS/protein carbonylation ratio by -13.5% (P = 0.08) and increase the GSH/GSSG ratio twofold vs. CON (P < 0.05). Insulin sensitivity was reduced (-5.9%, P < 0.05) by NAC compared with CON without decreased phosphorylation of Akt or AS160. Whereas p-mTOR was not significantly decreased by NAC after EX or REC, phosphorylation of the downstream protein synthesis target kinase p70S6K was blunted by 48% at PI with NAC compared with CON (P < 0.05). We conclude that NAC infusion attenuated muscle ROS and postexercise insulin sensitivity independent of Akt signaling. ROS also played a role in normal p70S6K phosphorylation in response to insulin stimulation in human skeletal muscle.
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Affiliation(s)
- Adam J Trewin
- College of Sport and Exercise Science and Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia
| | | | - Ben D Perry
- College of Sport and Exercise Science and Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia
| | | | | | - Itamar Levinger
- College of Sport and Exercise Science and Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia
| | - Leon R McQuade
- Australian Proteome Analysis Facility, Macquarie University, Sydney, New South Wales, Australia
| | - Nigel K Stepto
- College of Sport and Exercise Science and Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia;
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29
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Stöckli J, Meoli CC, Hoffman NJ, Fazakerley DJ, Pant H, Cleasby ME, Ma X, Kleinert M, Brandon AE, Lopez JA, Cooney GJ, James DE. The RabGAP TBC1D1 plays a central role in exercise-regulated glucose metabolism in skeletal muscle. Diabetes 2015; 64:1914-22. [PMID: 25576050 DOI: 10.2337/db13-1489] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Accepted: 12/24/2014] [Indexed: 11/13/2022]
Abstract
Insulin and exercise stimulate glucose uptake into skeletal muscle via different pathways. Both stimuli converge on the translocation of the glucose transporter GLUT4 from intracellular vesicles to the cell surface. Two Rab guanosine triphosphatases-activating proteins (GAPs) have been implicated in this process: AS160 for insulin stimulation and its homolog, TBC1D1, are suggested to regulate exercise-mediated glucose uptake into muscle. TBC1D1 has also been implicated in obesity in humans and mice. We investigated the role of TBC1D1 in glucose metabolism by generating TBC1D1(-/-) mice and analyzing body weight, insulin action, and exercise. TBC1D1(-/-) mice showed normal glucose and insulin tolerance, with no difference in body weight compared with wild-type littermates. GLUT4 protein levels were reduced by ∼40% in white TBC1D1(-/-) muscle, and TBC1D1(-/-) mice showed impaired exercise endurance together with impaired exercise-mediated 2-deoxyglucose uptake into white but not red muscles. These findings indicate that the RabGAP TBC1D1 plays a key role in regulating GLUT4 protein levels and in exercise-mediated glucose uptake in nonoxidative muscle fibers.
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Affiliation(s)
- Jacqueline Stöckli
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia Garvan Institute of Medical Research, Sydney, New South Wales, Australia St Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - Christopher C Meoli
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia Garvan Institute of Medical Research, Sydney, New South Wales, Australia
| | - Nolan J Hoffman
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia Garvan Institute of Medical Research, Sydney, New South Wales, Australia
| | - Daniel J Fazakerley
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia Garvan Institute of Medical Research, Sydney, New South Wales, Australia
| | - Himani Pant
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia
| | - Mark E Cleasby
- The Royal Veterinary College, University of London, London, U.K
| | - Xiuquan Ma
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia
| | - Maximilian Kleinert
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia Molecular Physiology Group, Department of Nutrition, Exercise and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Amanda E Brandon
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia
| | - Jamie A Lopez
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia
| | - Gregory J Cooney
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia St Vincent's Clinical School, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, Australia
| | - David E James
- Charles Perkins Centre, University of Sydney, Sydney, New South Wales, Australia School of Molecular Bioscience, University of Sydney, Sydney, New South Wales, Australia Garvan Institute of Medical Research, Sydney, New South Wales, Australia School of Medicine, University of Sydney, Sydney, New South Wales, Australia
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Glade MJ, Smith K. A glance at … exercise and glucose uptake. Nutrition 2015; 31:893-7. [PMID: 25933500 DOI: 10.1016/j.nut.2014.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Accepted: 12/03/2014] [Indexed: 10/24/2022]
Affiliation(s)
| | - Kyl Smith
- Progressive Laboratories Inc., Irving, Texas
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31
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Møller AB, Vendelbo MH, Christensen B, Clasen BF, Bak AM, Jørgensen JOL, Møller N, Jessen N. Physical exercise increases autophagic signaling through ULK1 in human skeletal muscle. J Appl Physiol (1985) 2015; 118:971-9. [DOI: 10.1152/japplphysiol.01116.2014] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 02/10/2015] [Indexed: 12/18/2022] Open
Abstract
Data from transgenic animal models suggest that exercise-induced autophagy is critical for adaptation to physical training, and that Unc-51 like kinase-1 (ULK1) serves as an important regulator of autophagy. Phosphorylation of ULK1 at Ser555 stimulates autophagy, whereas phosphorylation at Ser757 is inhibitory. To determine whether exercise regulates ULK1 phosphorylation in humans in vivo in a nutrient-dependent manner, we examined skeletal muscle biopsies from healthy humans after 1-h cycling exercise at 50% maximal O2 uptake on two occasions: 1) during a 36-h fast, and 2) during continuous glucose infusion at 0.2 kg/h. Physical exercise increased ULK1 phosphorylation at Ser555 and decreased lipidation of light chain 3B. ULK1 phosphorylation at Ser555 correlated positively with AMP-activated protein kinase-α Thr172 phosphorylation and negatively with light chain 3B lipidation. ULK1 phosphorylation at Ser757 was not affected by exercise. Fasting increased ULK1 and p62 protein expression, but did not affect exercise-induced ULK1 phosphorylation. These data demonstrate that autophagy signaling is activated in human skeletal muscle after 60 min of exercise, independently of nutritional status, and suggest that initiation of autophagy constitutes an important physiological response to exercise in humans.
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Affiliation(s)
- Andreas Buch Møller
- Research Laboratory for Biochemical Pathology, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Mikkel Holm Vendelbo
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Nuclear Medicine and PET Center, Aarhus University Hospital, Aarhus, Denmark; and
| | - Britt Christensen
- Research Laboratory for Biochemical Pathology, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Berthil Forrest Clasen
- Research Laboratory for Biochemical Pathology, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Ann Mosegaard Bak
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Jens O. L. Jørgensen
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Internal Medicine and Endocrinology, Aarhus University Hospital, Aarhus, Denmark
| | - Niels Møller
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Internal Medicine and Endocrinology, Aarhus University Hospital, Aarhus, Denmark
| | - Niels Jessen
- Research Laboratory for Biochemical Pathology, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
- Medical Research Laboratory, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
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Kristensen DE, Albers PH, Prats C, Baba O, Birk JB, Wojtaszewski JFP. Human muscle fibre type-specific regulation of AMPK and downstream targets by exercise. J Physiol 2015; 593:2053-69. [PMID: 25640469 DOI: 10.1113/jphysiol.2014.283267] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 01/23/2015] [Indexed: 11/08/2022] Open
Abstract
AMP-activated protein kinase (AMPK) is a regulator of energy homeostasis during exercise. Studies suggest muscle fibre type-specific AMPK expression. However, fibre type-specific regulation of AMPK and downstream targets during exercise has not been demonstrated. We hypothesized that AMPK subunits are expressed in a fibre type-dependent manner and that fibre type-specific activation of AMPK and downstream targets is dependent on exercise intensity. Pools of type I and II fibres were prepared from biopsies of vastus lateralis muscle from healthy men before and after two exercise trials: (1) continuous cycling (CON) for 30 min at 69 ± 1% peak rate of O2 consumption (V̇O2 peak ) or (2) interval cycling (INT) for 30 min with 6 × 1.5 min high-intensity bouts peaking at 95 ± 2% V̇O2 peak . In type I vs. II fibres a higher β1 AMPK (+215%) and lower γ3 AMPK expression (-71%) was found. α1 , α2 , β2 and γ1 AMPK expression was similar between fibre types. In type I vs. II fibres phosphoregulation after CON was similar (AMPK(Thr172) , ACC(Ser221) , TBC1D1(Ser231) and GS(2+2a) ) or lower (TBC1D4(Ser704) ). Following INT, phosphoregulation in type I vs. II fibres was lower (AMPK(Thr172) , TBC1D1(Ser231) , TBC1D4(Ser704) and ACC(Ser221) ) or higher (GS(2+2a) ). Exercise-induced glycogen degradation in type I vs. II fibres was similar (CON) or lower (INT). In conclusion, a differentiated response to exercise of metabolic signalling/effector proteins in human type I and II fibres was evident during interval exercise. This could be important for exercise type-specific adaptations, i.e. insulin sensitivity and mitochondrial density, and highlights the potential for new discoveries when investigating fibre type-specific signalling.
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Affiliation(s)
- Dorte E Kristensen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
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Albers PH, Pedersen AJT, Birk JB, Kristensen DE, Vind BF, Baba O, Nøhr J, Højlund K, Wojtaszewski JFP. Human muscle fiber type-specific insulin signaling: impact of obesity and type 2 diabetes. Diabetes 2015; 64:485-97. [PMID: 25187364 DOI: 10.2337/db14-0590] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Skeletal muscle is a heterogeneous tissue composed of different fiber types. Studies suggest that insulin-mediated glucose metabolism is different between muscle fiber types. We hypothesized that differences are due to fiber type-specific expression/regulation of insulin signaling elements and/or metabolic enzymes. Pools of type I and II fibers were prepared from biopsies of the vastus lateralis muscles from lean, obese, and type 2 diabetic subjects before and after a hyperinsulinemic-euglycemic clamp. Type I fibers compared with type II fibers have higher protein levels of the insulin receptor, GLUT4, hexokinase II, glycogen synthase (GS), and pyruvate dehydrogenase-E1α (PDH-E1α) and a lower protein content of Akt2, TBC1 domain family member 4 (TBC1D4), and TBC1D1. In type I fibers compared with type II fibers, the phosphorylation response to insulin was similar (TBC1D4, TBC1D1, and GS) or decreased (Akt and PDH-E1α). Phosphorylation responses to insulin adjusted for protein level were not different between fiber types. Independently of fiber type, insulin signaling was similar (TBC1D1, GS, and PDH-E1α) or decreased (Akt and TBC1D4) in muscle from patients with type 2 diabetes compared with lean and obese subjects. We conclude that human type I muscle fibers compared with type II fibers have a higher glucose-handling capacity but a similar sensitivity for phosphoregulation by insulin.
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Affiliation(s)
- Peter H Albers
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark Diabetes Research Unit, Novo Nordisk A/S, Maaloev, Denmark
| | - Andreas J T Pedersen
- Department of Endocrinology, Diabetes Research Center, Odense University Hospital, Odense, Denmark
| | - Jesper B Birk
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Dorte E Kristensen
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
| | - Birgitte F Vind
- Department of Endocrinology, Diabetes Research Center, Odense University Hospital, Odense, Denmark
| | - Otto Baba
- Section of Biology, Department of Oral Function and Molecular Biology, School of Dentistry, Ohu University, Koriyama, Japan
| | - Jane Nøhr
- Diabetes Research Unit, Novo Nordisk A/S, Maaloev, Denmark
| | - Kurt Højlund
- Department of Endocrinology, Diabetes Research Center, Odense University Hospital, Odense, Denmark
| | - Jørgen F P Wojtaszewski
- Section of Molecular Physiology, Department of Nutrition, Exercise and Sports, August Krogh Centre, University of Copenhagen, Copenhagen, Denmark
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Cartee GD. Roles of TBC1D1 and TBC1D4 in insulin- and exercise-stimulated glucose transport of skeletal muscle. Diabetologia 2015; 58:19-30. [PMID: 25280670 PMCID: PMC4258142 DOI: 10.1007/s00125-014-3395-5] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 08/07/2014] [Indexed: 10/24/2022]
Abstract
This review focuses on two paralogue Rab GTPase activating proteins known as TBC1D1 Tre-2/BUB2/cdc 1 domain family (TBC1D) 1 and TBC1D4 (also called Akt Substrate of 160 kDa, AS160) and their roles in controlling skeletal muscle glucose transport in response to the independent and combined effects of insulin and exercise. Convincing evidence implicates Akt2-dependent TBC1D4 phosphorylation on T642 as a key part of the mechanism for insulin-stimulated glucose uptake by skeletal muscle. TBC1D1 phosphorylation on several insulin-responsive sites (including T596, a site corresponding to T642 in TBC1D4) does not appear to be essential for in vivo insulin-stimulated glucose uptake by skeletal muscle. In vivo exercise or ex vivo contraction of muscle result in greater TBC1D1 phosphorylation on S237 that is likely to be secondary to increased AMP-activated protein kinase activity and potentially important for contraction-stimulated glucose uptake. Several studies that evaluated both normal and insulin-resistant skeletal muscle stimulated with a physiological insulin concentration after a single exercise session found that greater post-exercise insulin-stimulated glucose uptake was accompanied by greater TBC1D4 phosphorylation on several sites. In contrast, enhanced post-exercise insulin sensitivity was not accompanied by greater insulin-stimulated TBC1D1 phosphorylation. The mechanism for greater TBC1D4 phosphorylation in insulin-stimulated muscles after acute exercise is uncertain, and a causal link between enhanced TBC1D4 phosphorylation and increased post-exercise insulin sensitivity has yet to be established. In summary, TBC1D1 and TBC1D4 have important, but distinct roles in regulating muscle glucose transport in response to insulin and exercise.
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Affiliation(s)
- Gregory D Cartee
- Muscle Biology Laboratory, School of Kinesiology, University of Michigan, 401 Washtenaw Avenue, Ann Arbor, MI, 48109-2214, USA,
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35
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Angin Y, Schwenk RW, Nergiz-Unal R, Hoebers N, Heemskerk JWM, Kuijpers MJ, Coumans WA, van Zandvoort MAMJ, Bonen A, Neumann D, Glatz JFC, Luiken JJFP. Calcium signaling recruits substrate transporters GLUT4 and CD36 to the sarcolemma without increasing cardiac substrate uptake. Am J Physiol Endocrinol Metab 2014; 307:E225-36. [PMID: 24895286 DOI: 10.1152/ajpendo.00655.2013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Activation of AMP-activated protein kinase (AMPK) in cardiomyocytes induces translocation of glucose transporter GLUT4 and long-chain fatty acid (LCFA) transporter CD36 from endosomal stores to the sarcolemma to enhance glucose and LCFA uptake, respectively. Ca(2+)/calmodulin-activated kinase kinase-β (CaMKKβ) has been positioned directly upstream of AMPK. However, it is unknown whether acute increases in [Ca(2+)]i stimulate translocation of GLUT4 and CD36 and uptake of glucose and LCFA or whether Ca(2+) signaling converges with AMPK signaling to exert these actions. Therefore, we studied the interplay between Ca(2+) and AMPK signaling in regulation of cardiomyocyte substrate uptake. Exposure of primary cardiomyocytes to inhibitors or activators of Ca(2+) signaling affected neither AMPK-Thr(172) phosphorylation nor basal and AMPK-mediated glucose and LCFA uptake. Despite their lack of an effect on substrate uptake, Ca(2+) signaling activators induced GLUT4 and CD36 translocation. In contrast, AMPK activators stimulated GLUT4/CD36 translocation as well as glucose/LCFA uptake. When cardiomyocytes were cotreated with Ca(2+) signaling and AMPK activators, Ca(2+) signaling activators further enhanced AMPK-induced glucose/LCFA uptake. In conclusion, Ca(2+) signaling shows no involvement in AMPK-induced GLUT4/CD36 translocation and substrate uptake but elicits transporter translocation via a separate pathway requiring CaMKKβ/CaMKs. Ca(2+)-induced transporter translocation by itself appears to be ineffective to increase substrate uptake but requires additional AMPK activation to effectuate transporter translocation into increased substrate uptake. Ca(2+)-induced transporter translocation might be crucial under excessive cardiac stress conditions that require supraphysiological energy demands. Alternatively, Ca(2+) signaling might prepare the heart for substrate uptake during physiological contraction by inducing transporter translocation.
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Affiliation(s)
| | | | | | | | | | | | | | - Marc A M J van Zandvoort
- Molecular Cell Biology, School for Cardiovascular Diseases, Maastricht University, Maastricht, The Netherlands
| | - Arend Bonen
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
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Kao ACC, Müller DJ. Genetics of antipsychotic-induced weight gain: update and current perspectives. Pharmacogenomics 2014; 14:2067-83. [PMID: 24279860 DOI: 10.2217/pgs.13.207] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Antipsychotic medications are used to effectively treat various symptoms for different psychiatric conditions. Unfortunately, antipsychotic-induced weight gain (AIWG) is a common side effect that frequently results in obesity and secondary medical conditions. Twin and sibling studies have indicated that genetic factors are likely to be highly involved in AIWG. Over recent years, there has been considerable progress in this area, with several consistently replicated findings, as well as the identification of new genes and implicated pathways. Here, we will review the most recent genetic studies related to AIWG using the Medline database (PubMed) and Google Scholar. Among the steadiest findings associated with AIWG are serotonin 2C receptors (HTR2C) and leptin promoter gene variants, with more recent studies implicating MTHFR and, in particular, MC4R genes. Additional support was reported for the HRH1, BDNF, NPY, CNR1, GHRL, FTO and AMPK genes. Notably, some of the reported variants appear to have relatively large effect sizes. These findings have provided insights into the mechanisms involved in AIWG and will help to develop predictive genetic tests in the near future.
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Affiliation(s)
- Amy C C Kao
- Pharmacogenetics Research Clinic, Campbell Family Mental Health Research Institute, Centre for Addiction & Mental Health, University of Toronto, Toronto, ON, Canada
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Ryan AS, Katzel LI, Prior SJ, McLenithan JC, Goldberg AP, Ortmeyer HK. Aerobic exercise plus weight loss improves insulin sensitivity and increases skeletal muscle glycogen synthase activity in older men. J Gerontol A Biol Sci Med Sci 2014; 69:790-8. [PMID: 24357038 PMCID: PMC4111634 DOI: 10.1093/gerona/glt200] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 11/07/2013] [Indexed: 12/30/2022] Open
Abstract
The purpose of this study was to determine the effects of 6-month aerobic exercise training + weight loss (AEX + WL) on basal and insulin activation of glycogen synthase, basal citrate synthase activity, and Akt and AS160 phosphorylation in older, overweight/obese insulin-resistant men (n = 14; 63 ± 2 years; body mass index, 32 ± kg/m(2)). Muscle samples of the vastus lateralis were collected before and during a 3-hour 80 mU/m(2)/min hyperinsulinemic-euglycemic clamp. AEX + WL increased VO2max by 11% (p < .05) and decreased body weight (-9%, p < .001). AEX + WL increased basal citrate synthase activity by 46% (p < .01) and insulin activation of independent (2.9-fold) and fractional (2.3-fold) activities (both p < .001) of glycogen synthase. AEX + WL had no effect on phosphorylation of Akt or AS160. Glucose utilization (M) improved 25% (p < .01), and the change tended to be related to the increase in insulin activation of glycogen synthase fractional activity (r = .50, p = .08) following AEX + WL. In summary, AEX + WL has a robust effect on insulin activation of skeletal muscle glycogen synthase activity that likely contributes to improved glucose utilization in older insulin-resistant men.
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Affiliation(s)
- Alice S Ryan
- Baltimore VA Medical Center, VA Research Service, Geriatric Research, Education and Clinical Center (GRECC) and VA Maryland Health Care System, Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine.
| | - Leslie I Katzel
- Baltimore VA Medical Center, VA Research Service, Geriatric Research, Education and Clinical Center (GRECC) and VA Maryland Health Care System, Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine
| | - Steven J Prior
- Baltimore VA Medical Center, VA Research Service, Geriatric Research, Education and Clinical Center (GRECC) and VA Maryland Health Care System, Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine
| | - John C McLenithan
- Baltimore VA Medical Center, VA Research Service, Geriatric Research, Education and Clinical Center (GRECC) and VA Maryland Health Care System, Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine
| | - Andrew P Goldberg
- Baltimore VA Medical Center, VA Research Service, Geriatric Research, Education and Clinical Center (GRECC) and VA Maryland Health Care System, Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine
| | - Heidi K Ortmeyer
- Baltimore VA Medical Center, VA Research Service, Geriatric Research, Education and Clinical Center (GRECC) and VA Maryland Health Care System, Department of Medicine, Division of Gerontology and Geriatric Medicine, University of Maryland School of Medicine
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Affiliation(s)
- Rita Basu
- Endocrine Research Unit, Mayo Clinic , Rochester, Minnesota
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Vendelbo MH, Møller AB, Treebak JT, Gormsen LC, Goodyear LJ, Wojtaszewski JFP, Jørgensen JOL, Møller N, Jessen N. Sustained AS160 and TBC1D1 phosphorylations in human skeletal muscle 30 min after a single bout of exercise. J Appl Physiol (1985) 2014; 117:289-96. [PMID: 24876356 DOI: 10.1152/japplphysiol.00044.2014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND phosphorylation of AS160 and TBC1D1 plays an important role for GLUT4 mobilization to the cell surface. The phosphorylation of AS160 and TBC1D1 in humans in response to acute exercise is not fully characterized. OBJECTIVE to study AS160 and TBC1D1 phosphorylation in human skeletal muscle after aerobic exercise followed by a hyperinsulinemic euglycemic clamp. DESIGN eight healthy men were studied on two occasions: 1) in the resting state and 2) in the hours after a 1-h bout of ergometer cycling. A hyperinsulinemic euglycemic clamp was initiated 240 min after exercise and in a time-matched nonexercised control condition. We obtained muscle biopsies 30 min after exercise and in a time-matched nonexercised control condition (t = 30) and after 30 min of insulin stimulation (t = 270) and investigated site-specific phosphorylation of AS160 and TBC1D1. RESULTS phosphorylation on AS160 and TBC1D1 was increased 30 min after the exercise bout, whereas phosphorylation of the putative upstream kinases, Akt and AMPK, was unchanged compared with resting control condition. Exercise augmented insulin-stimulated phosphorylation on AS160 at Ser(341) and Ser(704) 270 min after exercise. No additional exercise effects were observed on insulin-stimulated phosphorylation of Thr(642) and Ser(588) on AS160 or Ser(237) and Thr(596) on TBC1D1. CONCLUSIONS AS160 and TBC1D1 phosphorylations were evident 30 min after exercise without simultaneously increased Akt and AMPK phosphorylation. Unlike TBC1D1, insulin-stimulated site-specific AS160 phosphorylation is modified by prior exercise, but these sites do not include Thr(642) and Ser(588). Together, these data provide new insights into phosphorylation of key regulators of glucose transport in human skeletal muscle.
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Affiliation(s)
- M H Vendelbo
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark; Department of Nuclear Medicine and PET center, Aarhus University Hospital, Aarhus, Denmark
| | - A B Møller
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark; Research Laboratory for Biochemical Pathology, Aarhus University Hospital, Aarhus, Denmark
| | - J T Treebak
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section of Integrative Physiology, University of Copenhagen, Copenhagen, Denmark
| | - L C Gormsen
- Department of Nuclear Medicine and PET center, Aarhus University Hospital, Aarhus, Denmark
| | - L J Goodyear
- Joslin Diabetes Center and Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts
| | - J F P Wojtaszewski
- Molecular Physiology Group, Department of Nutrition, Exercise and Sports, The August Krogh Centre, University of Copenhagen, Copenhagen, Denmark; and
| | - J O L Jørgensen
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - N Møller
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - N Jessen
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark; Research Laboratory for Biochemical Pathology, Aarhus University Hospital, Aarhus, Denmark; Department of Molecular Medicine, Aarhus University Hospital, Aarhus, Denmark
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40
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Treebak JT, Pehmøller C, Kristensen JM, Kjøbsted R, Birk JB, Schjerling P, Richter EA, Goodyear LJ, Wojtaszewski JFP. Acute exercise and physiological insulin induce distinct phosphorylation signatures on TBC1D1 and TBC1D4 proteins in human skeletal muscle. J Physiol 2013; 592:351-75. [PMID: 24247980 DOI: 10.1113/jphysiol.2013.266338] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
We investigated the phosphorylation signatures of two Rab-GTPase activating proteins TBC1D1 and TBC1D4 in human skeletal muscle in response to physical exercise and physiological insulin levels induced by a carbohydrate rich meal using a paired experimental design. Eight healthy male volunteers exercised in the fasted or fed state and muscle biopsies were taken before and immediately after exercise. We identified TBC1D1/4 phospho-sites that (1) did not respond to exercise or postprandial increase in insulin (TBC1D4: S666), (2) responded to insulin only (TBC1D4: S318), (3) responded to exercise only (TBC1D1: S237, S660, S700; TBC1D4: S588, S751), and (4) responded to both insulin and exercise (TBC1D1: T596; TBC1D4: S341, T642, S704). In the insulin-stimulated leg, Akt phosphorylation of both T308 and S473 correlated significantly with multiple sites on both TBC1D1 (T596) and TBC1D4 (S318, S341, S704). Interestingly, in the exercised leg in the fasted state TBC1D1 phosphorylation (S237, T596) correlated significantly with the activity of the α2/β2/γ3 AMPK trimer, whereas TBC1D4 phosphorylation (S341, S704) correlated with the activity of the α2/β2/γ1 AMPK trimer. Our data show differential phosphorylation of TBC1D1 and TBC1D4 in response to physiological stimuli in human skeletal muscle and support the idea that Akt and AMPK are upstream kinases. TBC1D1 phosphorylation signatures were comparable between in vitro contracted mouse skeletal muscle and exercised human muscle, and we show that AMPK regulated phosphorylation of these sites in mouse muscle. Contraction and exercise elicited a different phosphorylation pattern of TBC1D4 in mouse compared with human muscle, and although different circumstances in our experimental setup may contribute to this difference, the observation exemplifies that transferring findings between species is problematic.
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Affiliation(s)
- Jonas T Treebak
- The August Krogh Centre, Department of Nutrition, Exercise and Sports, Section of Molecular Physiology, University of Copenhagen, Universitetsparken 13 DK-2100, Copenhagen, Denmark.
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Abstract
Skeletal muscle is critical for whole-body glucose homoeostasis. Insulin and muscle contractions induced by exercise can increase glucose uptake through distinct intracellular signalling pathways involving PKB (protein kinase B)/Akt and AMPK (AMP-activated protein kinase) respectively. Whereas the proximal events governing these processes are becoming well understood, less is known about the regulation of the complex events necessary for the control of glucose uptake at the plasma membrane. In recent years, a number of common targets of AMPK and PKB/Akt have emerged as important components controlling glucose uptake, but the necessary phosphorylation events required for the control of glucose uptake have remained more elusive. In the current issue of the Biochemical Journal, Liu et al. identify that PIKfyve, a phosphoinositide phosphate kinase, is required for contraction-stimulated glucose uptake. They demonstrate that AMPK directly phosphorylates PIKfyve at Ser307, the same site as PKB/Akt, and that phosphorylation is increased in response to muscle contractions. These data provide compelling evidence for a new AMPK substrate that converges with PKB/Akt signalling and may be critical for the control of glucose uptake in skeletal muscle.
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Liu Q, Zhu X, Xu L, Fu Y, Garvey WT. 6-Mercaptopurine augments glucose transport activity in skeletal muscle cells in part via a mechanism dependent upon orphan nuclear receptor NR4A3. Am J Physiol Endocrinol Metab 2013; 305:E1081-92. [PMID: 24022864 PMCID: PMC3840207 DOI: 10.1152/ajpendo.00169.2013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The purine anti-metabolite 6-mercaptopurine (6-MP) is widely used for the treatment of leukemia and inflammatory diseases. The cellular effects of 6-MP on metabolism remain unknown; however, 6-MP was recently found to activate the orphan nuclear receptor NR4A3 in skeletal muscle cell lines. We have reported previously that NR4A3 (also known as NOR-1, MINOR) is a positive regulator of insulin sensitivity in adipocytes. To further explore the role of NR4A3 activation in insulin action, we explored whether 6-MP activation of NR4A3 could modulate glucose transport system activity in L6 skeletal muscle cells. We found that 6-MP increased both NR4A3 expression and NR4A3 transcriptional activity and enhanced glucose transport activity via increasing GLUT4 translocation in both basal and insulin-stimulated L6 cells in an NR4A3-dependent manner. Furthermore, 6-MP increased levels of phospho-AS160, although this effect was not modulated by NR4A3 overexpression or knockdown. These primary findings provide a novel proof of principle that 6-MP, a small molecule NR4A3 agonist, can augment glucose uptake in insulin target cells, although this occurs via both NR4A3-dependent and -independent actions; the latter is related to an increase in phospho-AS160. These results establish a novel target for development of new treatments for insulin resistance.
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MESH Headings
- 3T3 Cells
- Animals
- Antimetabolites/pharmacology
- Cells, Cultured
- DNA-Binding Proteins/drug effects
- DNA-Binding Proteins/genetics
- DNA-Binding Proteins/physiology
- GTPase-Activating Proteins/metabolism
- Glucose/metabolism
- Glucose Transport Proteins, Facilitative/metabolism
- Glucose Transporter Type 4/metabolism
- Insulin Resistance
- Mercaptopurine/pharmacology
- Mice
- Muscle Fibers, Skeletal/drug effects
- Muscle Fibers, Skeletal/metabolism
- Nerve Tissue Proteins/drug effects
- Nerve Tissue Proteins/genetics
- Nerve Tissue Proteins/physiology
- RNA/biosynthesis
- RNA/genetics
- RNA, Small Interfering/biosynthesis
- RNA, Small Interfering/genetics
- Rats
- Real-Time Polymerase Chain Reaction
- Receptors, Steroid/drug effects
- Receptors, Steroid/genetics
- Receptors, Steroid/physiology
- Receptors, Thyroid Hormone/drug effects
- Receptors, Thyroid Hormone/genetics
- Receptors, Thyroid Hormone/physiology
- Stimulation, Chemical
- Translocation, Genetic
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Affiliation(s)
- Qinglan Liu
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama
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McCaffery JM, Papandonatos GD, Huggins GS, Peter I, Erar B, Kahn SE, Knowler WC, Lipkin EW, Kitabchi AE, Wagenknecht LE, Wing RR. Human cardiovascular disease IBC chip-wide association with weight loss and weight regain in the look AHEAD trial. Hum Hered 2013; 75:160-74. [PMID: 24081232 PMCID: PMC4257841 DOI: 10.1159/000353181] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND/AIMS The present study identified genetic predictors of weight change during behavioral weight loss treatment. METHODS Participants were 3,899 overweight/obese individuals with type 2 diabetes from Look AHEAD, a randomized controlled trial to determine the effects of intensive lifestyle intervention (ILI), including weight loss and physical activity, relative to diabetes support and education, on cardiovascular outcomes. Analyses focused on associations of single nucleotide polymorphisms (SNPs) on the Illumina CARe iSelect (IBC) chip (minor allele frequency >5%; n = 31,959) with weight change at year 1 and year 4, and weight regain at year 4, among individuals who lost ≥ 3% at year 1. RESULTS Two novel regions of significant chip-wide association with year-1 weight loss in ILI were identified (p < 2.96E-06). ABCB11 rs484066 was associated with 1.16 kg higher weight per minor allele at year 1, whereas TNFRSF11A, or RANK, rs17069904 was associated with 1.70 kg lower weight per allele at year 1. CONCLUSIONS This study, the largest to date on genetic predictors of weight loss and regain, indicates that SNPs within ABCB11, related to bile salt transfer, and TNFRSF11A, implicated in adipose tissue physiology, predict the magnitude of weight loss during behavioral intervention. These results provide new insights into potential biological mechanisms and may ultimately inform weight loss treatment.
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Affiliation(s)
- Jeanne M McCaffery
- Weight Control and Diabetes Research Center, Department of Psychiatry and Human Behavior, The Miriam Hospital and Brown Medical School, Providence, R.I., USA
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Abstract
INTRODUCTION: Individuals with obesity and type 2 diabetes (T2D) are typically insulin resistant, exhibiting impaired skeletal muscle glucose uptake. Animal and cell culture experiments have shown that site-specific phosphorylation of the Rab-GTPase-activating proteins AS160 and TBC1D1 is critical for GLUT4 translocation facilitating glucose uptake, but their regulation in human skeletal muscle is not well understood. METHODS: Here, lean, obese and T2D subjects underwent a euglycemic-hyperinsulinemic clamp, and vastus lateralis muscle biopsies were obtained before, and at 30 and 180 min post insulin infusion. RESULTS: Obese and T2D subjects had higher body mass indexes and fasting insulin concentrations, and T2D subjects showed insulin resistance. Consistent with the clamp findings, T2D subjects had impaired insulin-stimulated phosphorylation of AS160 Thr642, a site previously shown to be important in glucose uptake in rodents. Interestingly, insulin-stimulated phosphorylation of TBC1D1 Thr590, a site shown to be regulated by insulin in rodents, was only increased in T2D subjects, although the functional significance of this difference is unknown. CONCLUSION: These data show that insulin differentially regulates AS160 and TBC1D1 phosphorylation in human skeletal muscle. Impaired insulin-stimulated glucose uptake in T2D subjects is accompanied by dysregulation of AS160 and TBC1D1 phosphorylation in skeletal muscle, suggesting that these proteins may regulate glucose uptake in humans.
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Affiliation(s)
- Leonidas S Lundell
- Department of Physiology and Pharmacology, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden.
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Brandl EJ, Tiwari AK, Lett TA, Shaikh SA, Lieberman JA, Meltzer HY, Kennedy JL, Müller DJ. Exploratory study on association of genetic variation in TBC1D1 with antipsychotic-induced weight gain. Hum Psychopharmacol 2013; 28:183-7. [PMID: 23364847 DOI: 10.1002/hup.2288] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 12/20/2012] [Indexed: 11/10/2022]
Abstract
BACKGROUND Previous studies have shown that antipsychotics with high propensity for antipsychotic-induced weight gain (AIWG) influence glucose transporter type 4 (GLUT4) mediated glucose intake. Variation in the gene encoding TBC1 domain family member 1 (TBC1D1), a Rab-GTPase activating protein regulating GLUT4 trafficking, has been associated with obesity. Therefore, we investigated the impact of TBC1D1 polymorphisms on AIWG. METHODS We analyzed rs9852 and rs35859249 in TBC1D1 in 195 schizophrenia subjects treated mostly with clozapine or olanzapine for up to 14 weeks. Association was tested using analysis of variance and analysis of covariance with change (%) from baseline weight as the dependent variable. RESULTS Analysis of covariance showed a non-significant trend for lower weight gain in carriers of the T-allele of rs9852 than in C-allele homozygotes (p = 0.063). This effect was more pronounced in the subgroup of patients treated with clozapine or olanzapine (p = 0.024). For rs35859249, no significant association with AIWG could be detected. CONCLUSIONS This is the first study examining the association between TBC1D1 and AIWG. The moderate association of rs9852, located in the 3'UTR near a miRNA binding site, indicates an influence of TBC1D1 on AIWG. Further investigations remain necessary to elucidate the role of this gene in AIWG.
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Affiliation(s)
- Eva J Brandl
- Pharmacogenetics Research Clinic, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health and Department of Psychiatry, University of Toronto, Toronto, ON, Canada
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Friedrichsen M, Mortensen B, Pehmøller C, Birk JB, Wojtaszewski JFP. Exercise-induced AMPK activity in skeletal muscle: role in glucose uptake and insulin sensitivity. Mol Cell Endocrinol 2013; 366:204-14. [PMID: 22796442 DOI: 10.1016/j.mce.2012.06.013] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Accepted: 06/21/2012] [Indexed: 12/25/2022]
Abstract
The energy/fuel sensor 5'-AMP-activated protein kinase (AMPK) is viewed as a master regulator of cellular energy balance due to its many roles in glucose, lipid, and protein metabolism. In this review we focus on the regulation of AMPK activity in skeletal muscle and its involvement in glucose metabolism, including glucose transport and glycogen synthesis. In addition, we discuss the plausible interplay between AMPK and insulin signaling regulating these processes.
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Affiliation(s)
- Martin Friedrichsen
- Molecular Physiology Group, The August Krogh Centre, Department of Exercise and Sport Sciences, University of Copenhagen, Denmark
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48
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Abstract
AMPK is an evolutionary conserved sensor of cellular energy status that is activated during exercise. Pharmacological activation of AMPK promotes glucose uptake, fatty acid oxidation, mitochondrial biogenesis, and insulin sensitivity; processes that are reduced in obesity and contribute to the development of insulin resistance. AMPK deficient mouse models have been used to provide direct genetic evidence either supporting or refuting a role for AMPK in regulating these processes. Exercise promotes glucose uptake by an insulin dependent mechanism involving AMPK. Exercise is important for improving insulin sensitivity; however, it is not known if AMPK is required for these improvements. Understanding how these metabolic processes are regulated is important for the development of new strategies that target obesity-induced insulin resistance. This review will discuss the involvement of AMPK in regulating skeletal muscle metabolism (glucose uptake, glycogen synthesis, and insulin sensitivity).
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Affiliation(s)
- Hayley M. O'Neill
- Protein Chemistry and Metabolism Unit, St. Vincent's Institute of Medical Research, Fitzroy, Australia
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50
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Pehmøller C, Brandt N, Birk JB, Høeg LD, Sjøberg KA, Goodyear LJ, Kiens B, Richter EA, Wojtaszewski JF. Exercise alleviates lipid-induced insulin resistance in human skeletal muscle-signaling interaction at the level of TBC1 domain family member 4. Diabetes 2012; 61:2743-52. [PMID: 22851577 PMCID: PMC3478539 DOI: 10.2337/db11-1572] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Excess lipid availability causes insulin resistance. We examined the effect of acute exercise on lipid-induced insulin resistance and TBC1 domain family member 1/4 (TBCD1/4)-related signaling in skeletal muscle. In eight healthy young male subjects, 1 h of one-legged knee-extensor exercise was followed by 7 h of saline or intralipid infusion. During the last 2 h, a hyperinsulinemic-euglycemic clamp was performed. Femoral catheterization and analysis of biopsy specimens enabled measurements of leg substrate balance and muscle signaling. Each subject underwent two experimental trials, differing only by saline or intralipid infusion. Glucose infusion rate and leg glucose uptake was decreased by intralipid. Insulin-stimulated glucose uptake was higher in the prior exercised leg in the saline and the lipid trials. In the lipid trial, prior exercise normalized insulin-stimulated glucose uptake to the level observed in the resting control leg in the saline trial. Insulin increased phosphorylation of TBC1D1/4. Whereas prior exercise enhanced TBC1D4 phosphorylation on all investigated sites compared with the rested leg, intralipid impaired TBC1D4 S341 phosphorylation compared with the control trial. Intralipid enhanced pyruvate dehydrogenase (PDH) phosphorylation and lactate release. Prior exercise led to higher PDH phosphorylation and activation of glycogen synthase compared with resting control. In conclusion, lipid-induced insulin resistance in skeletal muscle was associated with impaired TBC1D4 S341 and elevated PDH phosphorylation. The prophylactic effect of exercise on lipid-induced insulin resistance may involve augmented TBC1D4 signaling and glycogen synthase activation.
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Affiliation(s)
- Christian Pehmøller
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
| | - Nina Brandt
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
| | - Jesper B. Birk
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
| | - Louise D. Høeg
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
| | - Kim A. Sjøberg
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
| | - Laurie J. Goodyear
- Joslin Diabetes Center, Section on Metabolism, Harvard Medical School, Boston, Massachusetts
| | - Bente Kiens
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
| | - Erik A. Richter
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
| | - Jørgen F.P. Wojtaszewski
- Department of Exercise and Sport Sciences, Molecular Physiology Group, University of Copenhagen, Copenhagen, Denmark
- Corresponding author: Jørgen F.P. Wojtaszewski,
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