1
|
Sabaratnam R, Kristensen JM, Pedersen AJT, Kruse R, Handberg A, Wojtaszewski JFP, Højlund K. Acute Exercise Increases GDF15 and Unfolded Protein Response/Integrated Stress Response in Muscle in Type 2 Diabetes. J Clin Endocrinol Metab 2024; 109:1754-1764. [PMID: 38242693 DOI: 10.1210/clinem/dgae032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 12/27/2023] [Accepted: 01/16/2024] [Indexed: 01/21/2024]
Abstract
CONTEXT Regular exercise is a key prevention strategy for obesity and type 2 diabetes (T2D). Exerkines secreted in response to exercise or recovery may contribute to improved systemic metabolism. Conversely, an impaired exerkine response to exercise and recovery may contribute to cardiometabolic diseases. OBJECTIVE We investigated if the exercise-induced regulation of the exerkine, growth differentiation factor 15 (GDF15) and its putative upstream regulators of the unfolded protein response (UPR)/integrated stress response (ISR) is impaired in skeletal muscle in patients with T2D compared with weight-matched glucose-tolerant men. METHODS Thirteen male patients with T2D and 14 age- and weight-matched overweight/obese glucose-tolerant men exercised at 70% of VO2max for 1 hour. Blood and skeletal muscle biopsies were sampled before, immediately after, and 3 hours into recovery. Serum and muscle transcript levels of GDF15 and key markers of UPR/ISR were determined. Additionally, protein/phosphorylation levels of key regulators in UPR/ISR were investigated. RESULTS Acute exercise increased muscle gene expression and serum GDF15 levels in both groups. In recovery, muscle expression of GDF15 decreased toward baseline, whereas serum GDF15 remained elevated. In both groups, acute exercise increased the expression of UPR/ISR markers, including ATF4, CHOP, EIF2K3 (encoding PERK), and PPP1R15A (encoding GADD34), of which only CHOP remained elevated 3 hours into recovery. Downstream molecules of the UPR/ISR including XBP1-U, XBP1-S, and EDEM1 were increased with exercise and 3 hours into recovery in both groups. The phosphorylation levels of eIF2α-Ser51, a common marker of unfolded protein response (UPR) and ISR, increased immediately after exercise in controls, but decreased 3 hours into recovery in both groups. CONCLUSION In conclusion, exercise-induced regulation of GDF15 and key markers of UPR/ISR are not compromised in patients with T2D compared with weight-matched controls.
Collapse
Affiliation(s)
- Rugivan Sabaratnam
- Department of Clinical Research & Department of Molecular Medicine, University of Southern Denmark, DK-5230 Odense M, Denmark
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark
| | - Jonas M Kristensen
- Department of Clinical Research & Department of Molecular Medicine, University of Southern Denmark, DK-5230 Odense M, Denmark
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark
- The August Krogh Section for Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Andreas J T Pedersen
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark
| | - Rikke Kruse
- Department of Clinical Research & Department of Molecular Medicine, University of Southern Denmark, DK-5230 Odense M, Denmark
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark
| | - Aase Handberg
- Department of Clinical Biochemistry, Aalborg University Hospital, North Denmark Region, DK-9000 Aalborg, Denmark
- Department of Clinical Medicine, Aalborg University, DK-9000 Aalborg, Denmark
| | - Jørgen F P Wojtaszewski
- The August Krogh Section for Molecular Physiology, Department of Nutrition, Exercise and Sports, University of Copenhagen, DK-2100 Copenhagen, Denmark
| | - Kurt Højlund
- Department of Clinical Research & Department of Molecular Medicine, University of Southern Denmark, DK-5230 Odense M, Denmark
- Steno Diabetes Center Odense, Odense University Hospital, DK-5000 Odense C, Denmark
| |
Collapse
|
2
|
Noone J, Mucinski JM, DeLany JP, Sparks LM, Goodpaster BH. Understanding the variation in exercise responses to guide personalized physical activity prescriptions. Cell Metab 2024; 36:702-724. [PMID: 38262420 DOI: 10.1016/j.cmet.2023.12.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 12/11/2023] [Accepted: 12/20/2023] [Indexed: 01/25/2024]
Abstract
Understanding the factors that contribute to exercise response variation is the first step in achieving the goal of developing personalized exercise prescriptions. This review discusses the key molecular and other mechanistic factors, both extrinsic and intrinsic, that influence exercise responses and health outcomes. Extrinsic characteristics include the timing and dose of exercise, circadian rhythms, sleep habits, dietary interactions, and medication use, whereas intrinsic factors such as sex, age, hormonal status, race/ethnicity, and genetics are also integral. The molecular transducers of exercise (i.e., genomic/epigenomic, proteomic/post-translational, transcriptomic, metabolic/metabolomic, and lipidomic elements) are considered with respect to variability in physiological and health outcomes. Finally, this review highlights the current challenges that impede our ability to develop effective personalized exercise prescriptions. The Molecular Transducers of Physical Activity Consortium (MoTrPAC) aims to fill significant gaps in the understanding of exercise response variability, yet further investigations are needed to address additional health outcomes across all populations.
Collapse
Affiliation(s)
- John Noone
- Translational Research Institute, AdventHealth, Orlando, FL 32804, USA
| | | | - James P DeLany
- Translational Research Institute, AdventHealth, Orlando, FL 32804, USA
| | - Lauren M Sparks
- Translational Research Institute, AdventHealth, Orlando, FL 32804, USA
| | - Bret H Goodpaster
- Translational Research Institute, AdventHealth, Orlando, FL 32804, USA.
| |
Collapse
|
3
|
Soares RN, Lessard SJ. Low Response to Aerobic Training in Metabolic Disease: Role of Skeletal Muscle. Exerc Sport Sci Rev 2024; 52:47-53. [PMID: 38112622 PMCID: PMC10963145 DOI: 10.1249/jes.0000000000000331] [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: 12/21/2023]
Abstract
Aerobic exercise is established to increase cardiorespiratory fitness (CRF), which is linked to reduced morbidity and mortality. However, people with metabolic diseases such as type 1 and type 2 diabetes may be more likely to display blunted improvements in CRF with training. Here, we present evidence supporting the hypothesis that altered skeletal muscle signaling and remodeling may contribute to low CRF with metabolic disease.
Collapse
|
4
|
Moosavi D, Vuckovic I, Kunz HE, Lanza IR. Metabolomic response to acute resistance exercise in healthy older adults by 1H-NMR. PLoS One 2024; 19:e0301037. [PMID: 38547208 PMCID: PMC10977811 DOI: 10.1371/journal.pone.0301037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 03/03/2024] [Indexed: 04/02/2024] Open
Abstract
BACKGROUND The favorable health-promoting adaptations to exercise result from cumulative responses to individual bouts of physical activity. Older adults often exhibit anabolic resistance; a phenomenon whereby the anabolic responses to exercise and nutrition are attenuated in skeletal muscle. The mechanisms contributing to age-related anabolic resistance are emerging, but our understanding of how chronological age influences responsiveness to exercise is incomplete. The objective was to determine the effects of healthy aging on peripheral blood metabolomic response to a single bout of resistance exercise and whether any metabolites in circulation are predictive of anabolic response in skeletal muscle. METHODS Thirty young (20-35 years) and 49 older (65-85 years) men and women were studied in a cross-sectional manner. Participants completed a single bout of resistance exercise consisting of eight sets of 10 repetitions of unilateral knee extension at 70% of one-repetition maximum. Blood samples were collected before exercise, immediately post exercise, and 30-, 90-, and 180-minutes into recovery. Proton nuclear magnetic resonance spectroscopy was used to profile circulating metabolites at all timepoints. Serial muscle biopsies were collected for measuring muscle protein synthesis rates. RESULTS Our analysis revealed that one bout of resistance exercise elicits significant changes in 26 of 33 measured plasma metabolites, reflecting alterations in several biological processes. Furthermore, 12 metabolites demonstrated significant interactions between exercise and age, including organic acids, amino acids, ketones, and keto-acids, which exhibited distinct responses to exercise in young and older adults. Pre-exercise histidine and sarcosine were negatively associated with muscle protein synthesis, as was the pre/post-exercise fold change in plasma histidine. CONCLUSIONS This study demonstrates that while many exercise-responsive metabolites change similarly in young and older adults, several demonstrate age-dependent changes even in the absence of evidence of sarcopenia or frailty. TRIAL REGISTRATION Clinical trial registry: ClinicalTrials.gov NCT03350906.
Collapse
Affiliation(s)
- Darya Moosavi
- Department of Internal Medicine, Endocrine Research Unit, Division of Endocrinology, Mayo Clinic, Rochester, MN, United States of America
- Department of Biobehavioral Sciences, Teachers College, Columbia University, New York, NY, United States of America
| | - Ivan Vuckovic
- Department of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, MN, United States of America
| | - Hawley E. Kunz
- Department of Internal Medicine, Endocrine Research Unit, Division of Endocrinology, Mayo Clinic, Rochester, MN, United States of America
| | - Ian R. Lanza
- Department of Internal Medicine, Endocrine Research Unit, Division of Endocrinology, Mayo Clinic, Rochester, MN, United States of America
| |
Collapse
|
5
|
Zhang L, Lin H, Yang X, Shi J, Sheng X, Wang L, Li T, Quan H, Zhai X, Li W. Effects of dapagliflozin monotherapy and combined aerobic exercise on skeletal muscle mitochondrial quality control and insulin resistance in type 2 diabetes mellitus rats. Biomed Pharmacother 2023; 169:115852. [PMID: 37944441 DOI: 10.1016/j.biopha.2023.115852] [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] [Received: 09/08/2023] [Revised: 10/31/2023] [Accepted: 11/05/2023] [Indexed: 11/12/2023] Open
Abstract
Type 2 diabetes mellitus (T2DM) is a prevalent, chronic metabolic disease. Sodium-glucose cotransporter-2 (SGLT2) inhibitors and aerobic exercise (AE) have shown promise in mitigating insulin resistance (IR) and T2DM. This study investigated the effects of dapagliflozin (Dapa) monotherapy and combined AE on mitochondrial quality control (MQC) in skeletal muscle and IR in T2DM rats. T2DM rats, induced by a high-fat diet/streptozotocin model, were randomly assigned to the following groups: T2DM+vehicle group (DMV), T2DM rats treated with Dapa (DMDa, 10 mg/kg/d), T2DM rats subjected to combined Dapa treatment and AE (DMDa+AE), and the standard control group (CON). Blood and skeletal muscle samples were collected after 6 weeks of intragastric administration and treadmill exercise. The results showed that DMDa monotherapy could reduce the accumulation of white adipose tissue and skeletal muscle lipid droplets and improve HOMA-IR. While the combined AE led to further reductions in subcutaneous white adipose tissue and fasting glucose levels, it did not confer additional benefits in terms of HOMA-IR. Furthermore, Dapa monotherapy enhanced skeletal muscle mitochondrial biogenesis (PGC-1α, NRF1, TFAM, and COX IV), mitochondrial dynamics (OPA1, DRP1, and MFN2), and mitophagy (PGAM5 and PINK1) related protein levels. Nevertheless, the combination of Dapa with AE treatment did not yield an additive effect. In conclusion, this study highlights the potential of SGLT2 inhibitors, specifically Dapa, in ameliorating IR and maintaining MQC in skeletal muscle in rats with T2DM. However, combined AE did not produce an additive effect, indicating the need for further research.
Collapse
Affiliation(s)
- Liangzhi Zhang
- Exercise and Metabolism Research Center, College of Physical Education and Health Sciences, Zhejiang Normal University, Jinhua, Zhejiang, China
| | - Hengjun Lin
- Department of Colorectal anal Surgery, Jinhua People's Hospital, Jinhua, Zhejiang, China
| | - Xudong Yang
- Exercise and Metabolism Research Center, College of Physical Education and Health Sciences, Zhejiang Normal University, Jinhua, Zhejiang, China
| | - Jipeng Shi
- Exercise Capacity Assessment and Promotion Research Center, School of Physical Education, Northeast Normal University, Changchun, Jilin, China
| | - Xiusheng Sheng
- Medical Molecular Biology Laboratory, School of Medicine, Jinhua Polytechnic, Jinhua, Zhejiang, China
| | - Lifeng Wang
- Exercise and Metabolism Research Center, College of Physical Education and Health Sciences, Zhejiang Normal University, Jinhua, Zhejiang, China
| | - Ting Li
- Exercise and Metabolism Research Center, College of Physical Education and Health Sciences, Zhejiang Normal University, Jinhua, Zhejiang, China
| | - Helong Quan
- Exercise Capacity Assessment and Promotion Research Center, School of Physical Education, Northeast Normal University, Changchun, Jilin, China.
| | - Xia Zhai
- Medical Molecular Biology Laboratory, School of Medicine, Jinhua Polytechnic, Jinhua, Zhejiang, China.
| | - Wei Li
- Exercise and Metabolism Research Center, College of Physical Education and Health Sciences, Zhejiang Normal University, Jinhua, Zhejiang, China.
| |
Collapse
|
6
|
Gries KJ, Hart CR, Kunz HE, Ryan Z, Zhang X, Parvizi M, Liu Y, Dasari S, Lanza I. Acute responsiveness to single leg cycling in adults with obesity. Physiol Rep 2022; 10:e15539. [PMID: 36541258 PMCID: PMC9768637 DOI: 10.14814/phy2.15539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/11/2022] [Accepted: 11/26/2022] [Indexed: 05/28/2023] Open
Abstract
Obesity is associated with several skeletal muscle impairments which can be improved through an aerobic exercise prescription. The possibility that exercise responsiveness is diminished in people with obesity has been suggested but not well-studied. The purpose of this study was to investigate how obesity influences acute exercise responsiveness in skeletal muscle and circulating amino metabolites. Non-obese (NO; n = 19; 10F/9M; BMI = 25.1 ± 2.8 kg/m2 ) and Obese (O; n = 21; 14F/7M; BMI = 37.3 ± 4.6 kg/m2 ) adults performed 30 min of single-leg cycling at 70% of VO2 peak. 13 C6 -Phenylalanine was administered intravenously for muscle protein synthesis measurements. Serial muscle biopsies (vastus lateralis) were collected before exercise and 3.5- and 6.5-h post-exercise to measure protein synthesis and gene expression. Targeted plasma metabolomics was used to quantitate amino metabolites before and 30 and 90 min after exercise. The exercise-induced fold change in mixed muscle protein synthesis trended (p = 0.058) higher in NO (1.28 ± 0.54-fold) compared to O (0.95 ± 0.42-fold) and was inversely related to BMI (R2 = 0.140, p = 0.027). RNA sequencing revealed 331 and 280 genes that were differentially expressed after exercise in NO and O, respectively. Gene set enrichment analysis showed O had six blunted pathways related to metabolism, cell to cell communication, and protein turnover after exercise. The circulating amine response further highlighted dysregulations related to protein synthesis and metabolism in adults with obesity at the basal state and in response to the exercise bout. Collectively, these data highlight several unique pathways in individuals with obesity that resulted in a modestly blunted exercise response.
Collapse
Affiliation(s)
- Kevin J. Gries
- Endocrine Research Unit, Division of EndocrinologyDepartment of Internal Medicine, Mayo ClinicRochesterMinnesotaUSA
- Department of Physical Therapy, School of Health ProfessionsConcordia University of WisconsinMequonWisconsinUSA
| | - Corey R. Hart
- Endocrine Research Unit, Division of EndocrinologyDepartment of Internal Medicine, Mayo ClinicRochesterMinnesotaUSA
- Air Force Research Laboratory, 711th Human Performance Wing, Wright Patterson Air Force BaseDaytonOhioUSA
| | - Hawley E. Kunz
- Endocrine Research Unit, Division of EndocrinologyDepartment of Internal Medicine, Mayo ClinicRochesterMinnesotaUSA
| | - Zachary Ryan
- Endocrine Research Unit, Division of EndocrinologyDepartment of Internal Medicine, Mayo ClinicRochesterMinnesotaUSA
| | - Xiaoyan Zhang
- Endocrine Research Unit, Division of EndocrinologyDepartment of Internal Medicine, Mayo ClinicRochesterMinnesotaUSA
- Department of GeriatricsShanghai Jiaotong University Affiliated Sixth People's HospitalShanghaiChina
| | - Mojtaba Parvizi
- Endocrine Research Unit, Division of EndocrinologyDepartment of Internal Medicine, Mayo ClinicRochesterMinnesotaUSA
| | - Yuanhang Liu
- Department of Biomedical Statistics and Informatics, Mayo ClinicRochesterMinnesotaUSA
| | - Surendra Dasari
- Department of Biomedical Statistics and Informatics, Mayo ClinicRochesterMinnesotaUSA
| | - Ian R. Lanza
- Endocrine Research Unit, Division of EndocrinologyDepartment of Internal Medicine, Mayo ClinicRochesterMinnesotaUSA
| |
Collapse
|
7
|
Vanderboom P, Zhang X, Hart CR, Kunz HE, Gries KJ, Heppelmann CJ, Liu Y, Dasari S, Lanza IR. Impact of obesity on the molecular response to a single bout of exercise in a preliminary human cohort. Obesity (Silver Spring) 2022; 30:1091-1104. [PMID: 35470975 PMCID: PMC9048146 DOI: 10.1002/oby.23419] [Citation(s) in RCA: 3] [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] [Received: 10/28/2021] [Revised: 12/23/2021] [Accepted: 02/15/2022] [Indexed: 11/08/2022]
Abstract
OBJECTIVE The health benefits of exercise are well documented, but several exercise-response parameters are attenuated in individuals with obesity. The goal of this pilot study was to identify molecular mechanisms that may influence exercise response with obesity. METHODS A multi-omics comparison of the transcriptome, proteome, and phosphoproteome in muscle from a preliminary cohort of lean individuals (n = 4) and individuals with obesity (n = 4) was performed, before and after a single bout of 30 minutes of unilateral cycling at 70% maximal oxygen uptake (VO2 peak). Mass spectrometry and RNA sequencing were used to interrogate the proteome, phosphoproteome, and transcriptome from muscle biopsy tissue. RESULTS The main findings are that individuals with obesity exhibited transcriptional and proteomic signatures consistent with reduced mitochondrial function, protein synthesis, and glycogen synthesis. Furthermore, individuals with obesity demonstrated markedly different transcriptional, proteomic, and phosphoproteomic responses to exercise, particularly biosynthetic pathways of glycogen synthesis and protein synthesis. Casein kinase II subunit alpha and glycogen synthase kinase-3β signaling was identified as exercise-response pathways that were notably altered by obesity. CONCLUSIONS Opportunities to enhance exercise responsiveness by targeting specific molecular pathways that are disrupted in skeletal muscle from individuals with obesity await a better understanding of the precise molecular mechanisms that may limit exercise-response pathways in obesity.
Collapse
Affiliation(s)
- Patrick Vanderboom
- Endocrine Research Unit, Division of Endocrinology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
| | - Xiaoyan Zhang
- Endocrine Research Unit, Division of Endocrinology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
- Department of Geriatrics, Shanghai Jiaotong University Affiliated Sixth People’s Hospital, Shanghai, China
| | - Corey R. Hart
- Endocrine Research Unit, Division of Endocrinology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
- Air Force Research Laboratory, 711 Human Performance Wing, Wright Patterson Air Force Base, Dayton, Ohio
| | - Hawley E Kunz
- Endocrine Research Unit, Division of Endocrinology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
| | - Kevin J. Gries
- Endocrine Research Unit, Division of Endocrinology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
- Exercise and Sports Science, College of Health Professions, Marian University, Indianapolis, Indiana
| | - Carrie Jo Heppelmann
- Endocrine Research Unit, Division of Endocrinology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
| | - Yuanhang Liu
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, Minnesota
| | - Surendra Dasari
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, Minnesota
| | - Ian R. Lanza
- Endocrine Research Unit, Division of Endocrinology, Department of Internal Medicine, Mayo Clinic, Rochester, Minnesota
| |
Collapse
|
8
|
Egawa T, Ogawa T, Yokokawa T, Kido K, Goto K, Hayashi T. Methylglyoxal reduces molecular responsiveness to 4 weeks of endurance exercise in mouse plantaris muscle. J Appl Physiol (1985) 2022; 132:477-488. [PMID: 35023763 DOI: 10.1152/japplphysiol.00539.2021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Endurance exercise triggers skeletal muscle adaptations, including enhanced insulin signaling, glucose metabolism, and mitochondrial biogenesis. However, exercise-induced skeletal muscle adaptations may not occur in some cases, a condition known as exercise-resistance. Methylglyoxal (MG) is a highly reactive dicarbonyl metabolite and has detrimental effects on the body such as causing diabetic complications, mitochondrial dysfunction, and inflammation. This study aimed to clarify the effect of methylglyoxal on skeletal muscle molecular adaptations following endurance exercise. Mice were randomly divided into 4 groups (n = 12 per group): sedentary control group, voluntary exercise group, MG-treated group, and MG-treated with voluntary exercise group. Mice in the voluntary exercise group were housed in a cage with a running wheel, while mice in the MG-treated groups received drinking water containing 1% MG. Four weeks of voluntary exercise induced several molecular adaptations in the plantaris muscle, including increased expression of peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC1α), mitochondria complex proteins, toll-like receptor 4 (TLR4), 72-kDa heat shock protein (HSP72), hexokinase II, and glyoxalase 1; this also enhanced insulin-stimulated Akt Ser473 phosphorylation and citrate synthase activity. However, these adaptations were suppressed with MG treatment. In the soleus muscle, the exercise-induced increases in the expression of TLR4, HSP72, and advanced glycation end products receptor 1 were inhibited with MG treatment. These findings suggest that MG is a factor that inhibits endurance exercise-induced molecular responses including mitochondrial adaptations, insulin signaling activation, and the upregulation of several proteins related to mitochondrial biogenesis, glucose handling, and glycation in primarily fast-twitch skeletal muscle.
Collapse
Affiliation(s)
- Tatsuro Egawa
- Laboratory of Health and Exercise Sciences, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan
| | - Takeshi Ogawa
- Laboratory of Sports and Exercise Medicine, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan
| | - Takumi Yokokawa
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kohei Kido
- Faculty of Sports and Health Science, Fukuoka University, Fukuoka, Japan.,Institute for Physical Activity, Fukuoka University, Fukuoka, Japan
| | - Katsumasa Goto
- Laboratory of Physiology, Graduate School of Health Sciences, Toyohashi SOZO University, Aichi, Japan
| | - Tatsuya Hayashi
- Laboratory of Sports and Exercise Medicine, Graduate School of Human and Environmental Studies, Kyoto University, Kyoto, Japan
| |
Collapse
|
9
|
O'Reilly CL, Uranga S, Fluckey JD. Culprits or consequences: Understanding the metabolic dysregulation of muscle in diabetes. World J Biol Chem 2021; 12:70-86. [PMID: 34630911 PMCID: PMC8473417 DOI: 10.4331/wjbc.v12.i5.70] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 06/21/2021] [Accepted: 08/03/2021] [Indexed: 02/06/2023] Open
Abstract
The prevalence of type 2 diabetes (T2D) continues to rise despite the amount of research dedicated to finding the culprits of this debilitating disease. Skeletal muscle is arguably the most important contributor to glucose disposal making it a clear target in insulin resistance and T2D research. Within skeletal muscle there is a clear link to metabolic dysregulation during the progression of T2D but the determination of culprits vs consequences of the disease has been elusive. Emerging evidence in skeletal muscle implicates influential cross talk between a key anabolic regulatory protein, the mammalian target of rapamycin (mTOR) and its associated complexes (mTORC1 and mTORC2), and the well-described canonical signaling for insulin-stimulated glucose uptake. This new understanding of cellular signaling crosstalk has blurred the lines of what is a culprit and what is a consequence with regard to insulin resistance. Here, we briefly review the most recent understanding of insulin signaling in skeletal muscle, and how anabolic responses favoring anabolism directly impact cellular glucose disposal. This review highlights key cross-over interactions between protein and glucose regulatory pathways and the implications this may have for the design of new therapeutic targets for the control of glucoregulatory function in skeletal muscle.
Collapse
Affiliation(s)
| | - Selina Uranga
- Health and Kinesiology, Texas A&M University, TX 77843, United States
| | - James D Fluckey
- Health and Kinesiology, Texas A&M University, TX 77843, United States
| |
Collapse
|
10
|
Serrano N, Tran L, Hoffman N, Roust L, De Filippis EA, Carroll CC, Patel SH, Kras KA, Buras M, Katsanos CS. Lack of Increase in Muscle Mitochondrial Protein Synthesis During the Course of Aerobic Exercise and Its Recovery in the Fasting State Irrespective of Obesity. Front Physiol 2021; 12:702742. [PMID: 34408662 PMCID: PMC8365357 DOI: 10.3389/fphys.2021.702742] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 07/12/2021] [Indexed: 12/25/2022] Open
Abstract
Acute aerobic exercise induces skeletal muscle mitochondrial gene expression, which in turn can increase muscle mitochondrial protein synthesis. In this regard, the peroxisome proliferator-activated receptor γ coactivator 1α (PGC-1α), is a master regulator of mitochondrial biogenesis, and thus mitochondrial protein synthesis. However, PGC-1α expression is impaired in muscle of humans with obesity in response to acute aerobic exercise. Therefore, we sought to determine whether muscle mitochondrial protein synthesis is also impaired under the same conditions in humans with obesity. To this end, we measured mitochondrial and mixed-muscle protein synthesis in skeletal muscle of untrained subjects with (body fat: 34.7 ± 2.3%) and without (body fat: 25.3 ± 3.3%) obesity in a basal period and during a continuous period that included a 45 min cycling exercise (performed at an intensity corresponding to 65% of heart rate reserve) and a 3-h post-exercise recovery. Exercise increased PGC-1α mRNA expression in muscle of subjects without obesity, but not in subjects with obesity. However, muscle mitochondrial protein synthesis did not increase in either subject group. Similarly, mixed-muscle protein synthesis did not increase in either group. Concentrations of plasma amino acids decreased post-exercise in the subjects without obesity, but not in the subjects with obesity. We conclude that neither mitochondrial nor mixed-muscle protein synthesis increase in muscle of humans during the course of a session of aerobic exercise and its recovery period in the fasting state irrespective of obesity. Trial Registration: The study has been registered within ClinicalTrials.gov (NCT01824173).
Collapse
Affiliation(s)
- Nathan Serrano
- Center for Metabolic and Vascular Biology, Arizona State University, Scottsdale, AZ, United States
| | - Lee Tran
- Center for Metabolic and Vascular Biology, Arizona State University, Scottsdale, AZ, United States
| | - Nyssa Hoffman
- Center for Metabolic and Vascular Biology, Arizona State University, Scottsdale, AZ, United States
| | - Lori Roust
- Alix School of Medicine, Scottsdale, AZ, United States
| | | | - Chad C Carroll
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN, United States
| | - Shivam H Patel
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN, United States
| | - Katon A Kras
- Center for Metabolic and Vascular Biology, Arizona State University, Scottsdale, AZ, United States
| | - Matthew Buras
- Department of Biostatistics, Mayo Clinic in Arizona, Scottsdale, AZ, United States
| | - Christos S Katsanos
- Center for Metabolic and Vascular Biology, Arizona State University, Scottsdale, AZ, United States
| |
Collapse
|
11
|
Townsend LK, MacPherson REK, Wright DC. New Horizon: Exercise and a Focus on Tissue-Brain Crosstalk. J Clin Endocrinol Metab 2021; 106:2147-2163. [PMID: 33982072 DOI: 10.1210/clinem/dgab333] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Indexed: 01/03/2023]
Abstract
The world population is aging, leading to increased rates of neurodegenerative disorders. Exercise has countless health benefits and has consistently been shown to improve brain health and cognitive function. The purpose of this review is to provide an overview of exercise-induced adaptations in the brain with a focus on crosstalk between peripheral tissues and the brain. We highlight recent investigations into exercise-induced circulating factors, or exerkines, including irisin, cathepsin B, GPLD1, and ketones and the mechanisms mediating their effects in the brain.
Collapse
Affiliation(s)
- Logan K Townsend
- Department of Medicine, McMaster University, Hamilton, L8S 4L8, Canada
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, N1G 2W1, Canada
| | - Rebecca E K MacPherson
- Department of Health Sciences and Centre for Neuroscience, Brock University, St. Catharines, L2S 3A1, Canada
| | - David C Wright
- Department of Human Health and Nutritional Science, University of Guelph, Guelph, N1G 2W1, Canada
| |
Collapse
|
12
|
Pileggi CA, Parmar G, Harper ME. The lifecycle of skeletal muscle mitochondria in obesity. Obes Rev 2021; 22:e13164. [PMID: 33442950 DOI: 10.1111/obr.13164] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/10/2020] [Accepted: 10/12/2020] [Indexed: 12/12/2022]
Abstract
Skeletal muscle possesses dramatic metabolic plasticity that allows for the rapid adaptation in cellular energy transduction to meet the demands of the organism. Obesity elicits changes in skeletal muscle structure and function, resulting in the accumulation of intramuscular lipids. The accumulation of intramuscular lipids in obesity is associated with impaired skeletal muscle mitochondrial content and function. Mitochondria exist as a dynamic network that is regulated by the processes of biogenesis, fusion, fission, and mitophagy. In this review, we outline adaptations in molecular pathways that regulate mitochondrial structure and function in obesity. We highlight the emerging role of dysregulated skeletal muscle macroautophagy and mitochondrial turnover in obesity. Future research should further elucidate the role of mitophagy in observed reductions in mitochondrial content and function during obesity.
Collapse
Affiliation(s)
- Chantal A Pileggi
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.,Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| | - Gaganvir Parmar
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.,Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| | - Mary-Ellen Harper
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.,Ottawa Institute of Systems Biology, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| |
Collapse
|
13
|
Zapata-Bustos R, Finlayson J, Langlais PR, Coletta DK, Luo M, Grandjean D, De Filippis EA, Mandarino L. Altered Transcription Factor Expression Responses to Exercise in Insulin Resistance. Front Physiol 2021; 12:649461. [PMID: 33897458 PMCID: PMC8058368 DOI: 10.3389/fphys.2021.649461] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 03/10/2021] [Indexed: 11/24/2022] Open
Abstract
PURPOSE Insulin resistant muscle is resistant to gene expression changes induced by acute exercise. This study was undertaken to identify transcription factors that differentially respond to exercise in insulin resistance. Candidate transcription factors were identified from analysis of 5'-untranslated regions (5'-UTRs) of exercise responsive genes and from analysis of the 5'-UTRs of genes coding for proteins that differ in abundance in insulin resistance. RESEARCH DESIGN AND METHODS Twenty participants took part in this study. Insulin sensitivity was assessed by an euglycemic clamp. Participants were matched for aerobic capacity and performed a single 48 min bout of exercise with sets at 70 and 90% of maximum heart rate. Muscle biopsies were obtained at resting conditions, 30 min and 24 h after exercise. Global proteomics analysis identified differentially abundant proteins in muscle. The 5'-UTRs of genes coding for significant proteins were subjected to transcription factor enrichment analysis to identify candidate transcription factors. Q-rt-PCR to determine expression of candidate transcription factors was performed on RNA from resting and post-exercise muscle biopsies; immunoblots quantified protein abundance. RESULTS Proteins involved in mitochondrial function, protein targeting and translation, and metabolism were among those significantly different between lean and obese groups. Transcription factor enrichment analysis of genes coding for these proteins revealed new candidate transcription factors to be evaluated along the previously identified factors. Q-rt-PCR analysis of RNA and immunoblot analysis from pre- and post-exercise muscle biopsies revealed several transcription and growth factors that had altered responses to exercise in insulin resistant participants. A significant increase (EGR3 and CTGF) and decrease (RELA and ATF2) in the mRNA expression of transcription and growth factors was found after exercise in the lean group, but not in the obese participants. CONCLUSIONS These results confirm findings of an association between insulin sensitivity and transcription factor mRNA response to exercise and show that obesity also may be a sufficient prerequisite for exercise resistance. Analysis of the muscle proteome together with determination of effects of exercise on expression of transcription factors suggests that abnormal responses of transcription factors to exercise may be responsible for differences in protein abundances in insulin resistant muscle.
Collapse
Affiliation(s)
- Rocio Zapata-Bustos
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, AZ, United States
- Center for Disparities in Diabetes, Obesity and Metabolism, University of Arizona Health Sciences, Tucson, AZ, United States
| | - Jean Finlayson
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, AZ, United States
- Center for Disparities in Diabetes, Obesity and Metabolism, University of Arizona Health Sciences, Tucson, AZ, United States
| | - Paul R. Langlais
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, AZ, United States
- Center for Disparities in Diabetes, Obesity and Metabolism, University of Arizona Health Sciences, Tucson, AZ, United States
| | - Dawn K. Coletta
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, AZ, United States
- Center for Disparities in Diabetes, Obesity and Metabolism, University of Arizona Health Sciences, Tucson, AZ, United States
| | - Moulun Luo
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, AZ, United States
- Center for Disparities in Diabetes, Obesity and Metabolism, University of Arizona Health Sciences, Tucson, AZ, United States
| | | | | | - Lawrence Mandarino
- Division of Endocrinology, Department of Medicine, University of Arizona, Tucson, AZ, United States
- Center for Disparities in Diabetes, Obesity and Metabolism, University of Arizona Health Sciences, Tucson, AZ, United States
| |
Collapse
|
14
|
Modaresi MS, Fathei M, Attarzadeh Hosseini SR, Ziaaldini MM, Sadeghian Shahi MR. The effects of two iso-volume endurance training protocols on mitochondrial dysfunction in type 2 diabetic male mice. J Diabetes Metab Disord 2021; 19:1097-1103. [PMID: 33520827 DOI: 10.1007/s40200-020-00611-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 07/18/2020] [Accepted: 08/07/2020] [Indexed: 11/28/2022]
Abstract
Purpose Type 2diabetes(T2D) is one of the more common diseases in the world and has been widely spread. One of the suggested mechanisms in development of T2D, is mitochondrial dysfunction. The purpose of this study is to compare the effects of two endurance training protocols with low and moderate intensity on biogenesis and mitochondrial function, in Diabetic mice induced by high fat diet and Streptozotocin(STZ). Methods 40 five week old mice divided to four groups including: health control (HC, n = 7), diabetic control (DC, n = 7), low endurance training (DLT, n = 7) and moderate endurance training (DMT, n = 7). DMT group ran at 5 m/min for an hour, 3 days a week on a treadmill, and DLT group ran at 3 m/min for an hour, 5 days a week on a treadmill for 8 weeks. Results The cytosolic content of PGC1α, Tfam and mitochondrial content of citrate synthase(Cs) and cytochrome c oxidase(Cox) in DC was significantly reduced compared to HC(P˂0.05). All of the parameters except for Cs in both DLT and DMT were increased compared to DC (P˂0.05), but there was no difference between them and the HC (P˃0.05). There was no difference in Cs enzyme between the DC and the DLT(P˃0.05), but it was significantly increased in the DMT(P˂0.05). There was a significantly difference between Cs enzyme in HC and DLT(P˂0.05), but there wasn't any significant difference between HC and DMT(P˃0.05). Conclusions The results showed that in same volume condition, both endurance training protocols improved the proteins involved in biogenesis and mitochondrial function in T2D mice and there was no significant difference between them.
Collapse
Affiliation(s)
| | - Mehrdad Fathei
- Faculty of Sport Science, Ferdowsi University of Mashhad, Azadi sq, Mashhad, Iran
| | | | | | | |
Collapse
|
15
|
Wahwah N, Kras KA, Roust LR, Katsanos CS. Subpopulation-specific differences in skeletal muscle mitochondria in humans with obesity: insights from studies employing acute nutritional and exercise stimuli. Am J Physiol Endocrinol Metab 2020; 318:E538-E553. [PMID: 31990577 DOI: 10.1152/ajpendo.00463.2019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Mitochondria from skeletal muscle of humans with obesity often display alterations with respect to their morphology, proteome, biogenesis, and function. These changes in muscle mitochondria are considered to contribute to metabolic abnormalities observed in humans with obesity. Most of the evidence describing alterations in muscle mitochondria in humans with obesity, however, lacks reference to a specific subcellular location. This is despite data over the years showing differences in the morphology and function of subsarcolemmal (found near the plasma membrane) and intermyofibrillar (nested between the myofibrils) mitochondria in skeletal muscle. Recent studies reveal that impairments in mitochondrial function in obesity with respect to the subcellular location of the mitochondria in muscle are more readily evident following exposure of the skeletal muscle to physiological stimuli. In this review, we highlight the need to understand skeletal muscle mitochondria metabolism in obesity in a subpopulation-specific manner and in the presence of physiological stimuli that modify mitochondrial function in vivo. Experimental approaches employed under these conditions will allow for more precise characterization of impairments in skeletal muscle mitochondria and their implications in inducing metabolic dysfunction in human obesity.
Collapse
Affiliation(s)
- Nisreen Wahwah
- Center for Metabolic and Vascular Biology and School of Life Sciences, Arizona State University, Scottsdale, Arizona
| | - Katon A Kras
- Center for Metabolic and Vascular Biology and School of Life Sciences, Arizona State University, Scottsdale, Arizona
| | - Lori R Roust
- College of Medicine, Mayo Clinic in Arizona, Scottsdale, Arizona
| | - Christos S Katsanos
- Center for Metabolic and Vascular Biology and School of Life Sciences, Arizona State University, Scottsdale, Arizona
| |
Collapse
|
16
|
Granata C, Oliveira RSF, Little JP, Bishop DJ. Forty high-intensity interval training sessions blunt exercise-induced changes in the nuclear protein content of PGC-1α and p53 in human skeletal muscle. Am J Physiol Endocrinol Metab 2020; 318:E224-E236. [PMID: 31794264 PMCID: PMC7052577 DOI: 10.1152/ajpendo.00233.2019] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 12/02/2019] [Accepted: 12/03/2019] [Indexed: 12/11/2022]
Abstract
Exercise-induced increases in peroxisome proliferator-activated receptor-γ coactivator-1α (PGC-1α) and p53 protein content in the nucleus mediate the initial phase of exercise-induced mitochondrial biogenesis. Here, we investigated whether exercise-induced increases in these and other markers of mitochondrial biogenesis were altered after 40 sessions of twice-daily high-volume, high-intensity interval training (HVT) in human skeletal muscle. Vastus lateralis muscle biopsies were collected from 10 healthy recreationally active participants before, immediately postexercise, and 3 h after a session of high-intensity interval exercise (HIIE) performed at the same absolute exercise intensity before and after HVT (pre-HVT and post-HVT, respectively). The protein content of common markers of exercise-induced mitochondrial biogenesis was assessed in nuclear- and cytosolic-enriched fractions by immunoblotting; mRNA contents of key transcription factors and mitochondrial genes were assessed by qPCR. Despite exercise-induced increases in PGC-1α, p53, and plant homeodomain finger-containing protein 20 (PHF20) protein content, the phosphorylation of p53 and acetyl-CoA carboxylase (p-p53 Ser15 and p-ACC Ser79, respectively), and PGC-1α mRNA Pre-HVT, no significant changes were observed post-HVT. Forty sessions of twice-daily high-intensity interval training blunted all of the measured exercise-induced molecular events associated with mitochondrial biogenesis that were observed pre-HVT. Future studies should determine whether this loss relates to the decrease in relative exercise intensity, habituation to the same exercise stimulus, or a combination of both.
Collapse
Affiliation(s)
- Cesare Granata
- Institute for Health and Sport, Victoria University, Melbourne, Victoria, Australia
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Victoria, Australia
| | - Rodrigo S F Oliveira
- Institute for Health and Sport, Victoria University, Melbourne, Victoria, Australia
| | - Jonathan P Little
- School of Health and Exercise Sciences, University of British Columbia Okanagan, Kelowna, British Columbia, Canada
| | - David J Bishop
- Institute for Health and Sport, Victoria University, Melbourne, Victoria, Australia
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia
| |
Collapse
|
17
|
Sabaratnam R, Pedersen AJ, Eskildsen TV, Kristensen JM, Wojtaszewski JFP, Højlund K. Exercise Induction of Key Transcriptional Regulators of Metabolic Adaptation in Muscle Is Preserved in Type 2 Diabetes. J Clin Endocrinol Metab 2019; 104:4909-4920. [PMID: 31135885 DOI: 10.1210/jc.2018-02679] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 05/22/2019] [Indexed: 12/30/2022]
Abstract
CONTEXT Type 2 diabetes (T2D) is characterized by insulin resistance in skeletal muscle. Regular exercise improves insulin sensitivity, mitochondrial function, and energy metabolism. Thus, an impaired response to exercise may contribute to insulin resistance. OBJECTIVE We hypothesized that key transcriptional regulators of metabolic adaptation to exercise show an attenuated response in skeletal muscle in T2D. DESIGN AND PATIENTS Skeletal muscle biopsies were obtained from 13 patients with T2D and 14 age- and weight-matched controls before, immediately after 1 hour acute exercise (70% maximal pulmonary oxygen uptake), and 3 hours into recovery to examine mRNA expression of key transcription factors and downstream targets and activity of key upstream kinases underlying the metabolic adaptation to exercise. RESULTS Acute exercise increased gene expression of the nuclear hormone receptor 4A (NR4A) subfamily (∼4- to 36-fold) and other key transcription factors, including ATF3, EGR1, JUNB, SIK1, PPARA, and PPARG (∼1.5- to 12-fold), but with no differences between groups. The expression of NR4A1 (approximately eightfold) and NR4A3 (∼75-fold) was further increased 3 hours into recovery, whereas most muscle transcripts sustained elevated or returned to basal levels, again with no differences between groups. Muscle expression of HKII and SLC2A4 and hexokinase II protein content were reduced in patients with T2D. The phosphorylation of p38 MAPK, Erk1/2, Ca2+/calmodulin-dependent kinase II, and cAMP-responsive element-binding protein was equally increased in response to exercise and/or recovery in both groups. CONCLUSION Acute exercise elicits a pronounced and overall similar increase in expression of key transcription factors and activation of key upstream kinases involved in muscle metabolic adaptation to exercise in patients with T2D and weight-matched controls.
Collapse
Affiliation(s)
- Rugivan Sabaratnam
- Steno Diabetes Center Odense, Odense University Hospital, Odense C, Denmark
- Section of Molecular Diabetes and Metabolism, Department of Clinical Research, University of Southern Denmark, Odense C, Denmark
- Department of Molecular Medicine, University of Southern Denmark, Odense C, Denmark
| | - Andreas J Pedersen
- Section of Molecular Diabetes and Metabolism, Department of Clinical Research, University of Southern Denmark, Odense C, Denmark
- Department of Molecular Medicine, University of Southern Denmark, Odense C, Denmark
| | - Tilde V Eskildsen
- Department of Cardiovascular and Renal Research, University of Southern Denmark, Odense M, Denmark
- Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, Odense C, Denmark
| | - Jonas M Kristensen
- Section of Molecular Physiology, August Krogh Centre, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Jørgen F P Wojtaszewski
- Section of Molecular Physiology, August Krogh Centre, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Kurt Højlund
- Steno Diabetes Center Odense, Odense University Hospital, Odense C, Denmark
- Section of Molecular Diabetes and Metabolism, Department of Clinical Research, University of Southern Denmark, Odense C, Denmark
- Department of Molecular Medicine, University of Southern Denmark, Odense C, Denmark
| |
Collapse
|
18
|
Linden MA, Ross TT, Beebe DA, Gorgoglione MF, Hamilton KL, Miller BF, Braun B, Esler WP. The combination of exercise training and sodium-glucose cotransporter-2 inhibition improves glucose tolerance and exercise capacity in a rodent model of type 2 diabetes. Metabolism 2019; 97:68-80. [PMID: 31132381 DOI: 10.1016/j.metabol.2019.05.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 04/19/2019] [Accepted: 05/21/2019] [Indexed: 01/24/2023]
Abstract
PURPOSE Exercise is recommended in addition to pharmacotherapies for the management of type 2 diabetes, but metformin and exercise training may have non-additive or even inhibitory effects on exercise-induced improvements in glycemic control and exercise capacity. The objectives of this report were to determine if co-treatment with a sodium-glucose cotransporter-2 inhibitor and exercise could (1) further improve glycemic control when compared to either monotherapy and (2) not worsen exercise capacity when compared to exercise alone. METHODS A rodent model of type 2 diabetes (30 mg/kg streptozotocin and high-fat feeding in male Sprague-Dawley rats) was used to assess 12 weeks of co-treatment with a sodium-glucose cotransporter 2 inhibitor (SGLT2i) and exercise (EX; treadmill running) on glycemic control and exercise capacity. Animals were randomized to the following conditions (n = 7-10/group): vehicle (0.5% methyl cellulose) sedentary (VEH SED), VEH EX, canagliflozin (3 mg kg-1 d-1) SED (SGLT2i SED), or SGLT2i EX. RESULTS Both EX and SGLT2i independently improved indices of glycemic control. The combination of SGLT2i and EX further improved glucose tolerance (glucose area under the curve 1109 ± 51 vs 1427 ± 82 mmol/ L 120 min-1 for SGLT2i EX vs. SGLT2i SED, respectively; p < 0.05) and insulin responses (insulin area under the curve 24,524 ± 4126 vs. 41,208 ± 2714 pmol L-1 120 min-1 for SGLT2i EX vs. VEH EX, respectively; p < 0.05) during an oral glucose tolerance test. Only the combination of SGLT2i EX lowered body weight compared to VEH SED (p < 0.01). SGLT2i caused several metabolic adaptations including increased ketone production and a greater reliance on fat as a source of energy during normal cage activity. Interestingly, animals that were given the SGLT2i and underwent exercise training (SGLT2i EX) had better submaximal exercise capacity than EX alone, as indicated by distance run prior to fatigue (882 ± 183 vs.433 ± 33 m for SGLT2i EX and VEH EX, respectively; p < 0.01), and this was accompanied by a greater reliance on fat as an energy source during exercise (p < 0.01). CONCLUSIONS If these findings with the combination of SGLT2i and exercise translate to humans, they will have important clinical health implications.
Collapse
Affiliation(s)
- Melissa A Linden
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA, United States of America; Department of Health and Exercise Science, Colorado State University, Fort Collins, CO, United States of America
| | - Trenton T Ross
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA, United States of America
| | - David A Beebe
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA, United States of America
| | - Matthew F Gorgoglione
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA, United States of America
| | - Karyn L Hamilton
- Department of Health and Exercise Science, Colorado State University, Fort Collins, CO, United States of America
| | - Benjamin F Miller
- Department of Health and Exercise Science, Colorado State University, Fort Collins, CO, United States of America; Aging and Metabolism Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK., United States of America
| | - Barry Braun
- Department of Health and Exercise Science, Colorado State University, Fort Collins, CO, United States of America
| | - William P Esler
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA, United States of America.
| |
Collapse
|
19
|
Borg ML, Massart J, Schönke M, De Castro Barbosa T, Guo L, Wade M, Alsina-Fernandez J, Miles R, Ryan A, Bauer S, Coskun T, O'Farrell E, Niemeier EM, Chibalin AV, Krook A, Karlsson HK, Brozinick JT, Zierath JR. Modified UCN2 Peptide Acts as an Insulin Sensitizer in Skeletal Muscle of Obese Mice. Diabetes 2019; 68:1403-1414. [PMID: 31010957 DOI: 10.2337/db18-1237] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 04/08/2019] [Indexed: 11/13/2022]
Abstract
The neuropeptide urocortin 2 (UCN2) and its receptor corticotropin-releasing hormone receptor 2 (CRHR2) are highly expressed in skeletal muscle and play a role in regulating energy balance and glucose metabolism. We investigated a modified UCN2 peptide as a potential therapeutic agent for the treatment of obesity and insulin resistance, with a specific focus on skeletal muscle. High-fat-fed mice (C57BL/6J) were injected daily with a PEGylated UCN2 peptide (compound A) at 0.3 mg/kg subcutaneously for 14 days. Compound A reduced body weight, food intake, whole-body fat mass, and intramuscular triglycerides compared with vehicle-treated controls. Furthermore, whole-body glucose tolerance was improved by compound A treatment, with increased insulin-stimulated Akt phosphorylation at Ser473 and Thr308 in skeletal muscle, concomitant with increased glucose transport into extensor digitorum longus and gastrocnemius muscle. Mechanistically, this is linked to a direct effect on skeletal muscle because ex vivo exposure of soleus muscle from chow-fed lean mice to compound A increased glucose transport and insulin signaling. Moreover, exposure of GLUT4-Myc-labeled L6 myoblasts to compound A increased GLUT4 trafficking. Our results demonstrate that modified UCN2 peptides may be efficacious in the treatment of type 2 diabetes by acting as an insulin sensitizer in skeletal muscle.
Collapse
Affiliation(s)
- Melissa L Borg
- Department of Physiology and Pharmacology, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Julie Massart
- Department of Molecular Medicine and Surgery, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Milena Schönke
- Department of Molecular Medicine and Surgery, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Thais De Castro Barbosa
- Department of Physiology and Pharmacology, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Lili Guo
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Mark Wade
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | | | - Rebecca Miles
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Andrew Ryan
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Steve Bauer
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Tamer Coskun
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Elizabeth O'Farrell
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Evan M Niemeier
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Alexander V Chibalin
- Department of Molecular Medicine and Surgery, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Anna Krook
- Department of Physiology and Pharmacology, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Håkan K Karlsson
- Department of Molecular Medicine and Surgery, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| | - Joseph T Brozinick
- Lilly Research Laboratories, Division of Eli Lilly and Company, Indianapolis, IN
| | - Juleen R Zierath
- Department of Physiology and Pharmacology, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
- Department of Molecular Medicine and Surgery, Section for Integrative Physiology, Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
20
|
N-acetyl-L-cysteine Prevents Lactate-Mediated PGC1-alpha Expression in C2C12 Myotubes. BIOLOGY 2019; 8:biology8020044. [PMID: 31185672 PMCID: PMC6627666 DOI: 10.3390/biology8020044] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 11/21/2022]
Abstract
Background: Exercise induces many physiological adaptations. Recently, it has been proposed that some of these adaptations are induced by exercise-mediated lactate production. In this study, we aimed to investigate in vitro the effect of lactate in cultured myotubes and whether antioxidants could inhibit the effect. Methods: Differentiated myotubes were cultured at different concentrations of L-lactate (0, 10, 30, 50 mM) in the absence or presence of an antioxidant, N-acetyl-L-cysteine (Nac). The temporal effect of lactate exposure in myotubes was also explored. Results: Two hours of exposure to 50 mM L-lactate and six hours of exposure to 30 or 50 mM L-lactate caused a significant increase in PGC1-alpha (peroxisome proliferator-activated receptor γ coactivator-1α) expression in the myotubes. This up-regulation was suppressed by 2 mM Nac. Intermittent and continuous lactate exposure caused similar PGC1-alpha up-regulation. These results suggest that the increase in PGC1-alpha expression is mediated by reactive oxygen species (ROS) production from lactate metabolism and that both continuous and intermittent exposure to L-lactate can cause the up-regulation.
Collapse
|
21
|
Principles of Exercise Prescription, and How They Influence Exercise-Induced Changes of Transcription Factors and Other Regulators of Mitochondrial Biogenesis. Sports Med 2019; 48:1541-1559. [PMID: 29675670 DOI: 10.1007/s40279-018-0894-4] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Physical inactivity represents the fourth leading risk factor for mortality, and it has been linked with a series of chronic disorders, the treatment of which absorbs ~ 85% of healthcare costs in developed countries. Conversely, physical activity promotes many health benefits; endurance exercise in particular represents a powerful stimulus to induce mitochondrial biogenesis, and it is routinely used to prevent and treat chronic metabolic disorders linked with sub-optimal mitochondrial characteristics. Given the importance of maintaining a healthy mitochondrial pool, it is vital to better characterize how manipulating the endurance exercise dose affects cellular mechanisms of exercise-induced mitochondrial biogenesis. Herein, we propose a definition of mitochondrial biogenesis and the techniques available to assess it, and we emphasize the importance of standardizing biopsy timing and the determination of relative exercise intensity when comparing different studies. We report an intensity-dependent regulation of exercise-induced increases in nuclear peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) protein content, nuclear phosphorylation of p53 (serine 15), and PGC-1α messenger RNA (mRNA), as well as training-induced increases in PGC-1α and p53 protein content. Despite evidence that PGC-1α protein content plateaus within a few exercise sessions, we demonstrate that greater training volumes induce further increases in PGC-1α (and p53) protein content, and that short-term reductions in training volume decrease the content of both proteins, suggesting training volume is still a factor affecting training-induced mitochondrial biogenesis. Finally, training-induced changes in mitochondrial transcription factor A (TFAM) protein content are regulated in a training volume-dependent manner and have been linked with training-induced changes in mitochondrial content.
Collapse
|
22
|
Park S, Turner KD, Zheng D, Brault JJ, Zou K, Chaves AB, Nielsen TS, Tanner CJ, Treebak JT, Houmard JA. Electrical pulse stimulation induces differential responses in insulin action in myotubes from severely obese individuals. J Physiol 2018; 597:449-466. [PMID: 30414190 DOI: 10.1113/jp276990] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 11/07/2018] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS Exercise/exercise training can enhance insulin sensitivity through adaptations in skeletal muscle, the primary site of insulin-mediated glucose disposal; however, in humans the range of improvement can vary substantially. The purpose of this study was to determine if obesity influences the magnitude of the exercise response in relation to improving insulin sensitivity in human skeletal muscle. Electrical pulse stimulation (EPS; 24 h) of primary human skeletal muscle myotubes improved insulin action in tissue from both lean and severely obese individuals, but responses to EPS were blunted with obesity. EPS improved insulin signal transduction in myotubes from lean but not severely obese subjects and increased AMP accumulation and AMPK Thr172 phosphorylation, but to a lesser degree in myotubes from the severely obese. These data reveal that myotubes of severely obese individuals enhance insulin action and stimulate exercise-responsive molecules with contraction, but in a manner and magnitude that differs from lean subjects. ABSTRACT Exercise/muscle contraction can enhance whole-body insulin sensitivity; however, in humans the range of improvements can vary substantially. In order, to determine if obesity influences the magnitude of the exercise response, this study compared the effects of electrical pulse stimulation (EPS)-induced contractile activity upon primary myotubes derived from lean and severely obese (BMI ≥ 40 kg/m2 ) women. Prior to muscle contraction, insulin action was compromised in myotubes from the severely obese as was evident from reduced insulin-stimulated glycogen synthesis, glucose oxidation, glucose uptake, insulin signal transduction (IRS1, Akt, TBC1D4), and insulin-stimulated GLUT4 translocation. EPS (24 h) increased AMP, IMP, AMPK Thr172 phosphorylation, PGC1α content, and insulin action in myotubes of both the lean and severely obese subjects. However, despite normalizing indices of insulin action to levels seen in the lean control (non-EPS) condition, responses to EPS were blunted with obesity. EPS improved insulin signal transduction in myotubes from lean but not severely obese subjects and EPS increased AMP accumulation and AMPK Thr172 phosphorylation, but to a lesser degree in myotubes from the severely obese. These data reveal that myotubes of severely obese individuals enhance insulin action and stimulate exercise-responsive molecules with contraction, but in a manner and magnitude that differs from lean subjects.
Collapse
Affiliation(s)
- Sanghee Park
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA
| | - Kristen D Turner
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA
| | - Donghai Zheng
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA
| | - Jeffrey J Brault
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA
| | - Kai Zou
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA.,Department of Exercise and Health Sciences, University of Massachusetts Boston, Boston, MA, USA
| | - Alec B Chaves
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA
| | - Thomas S Nielsen
- Section of Integrative Physiology, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Charles J Tanner
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA
| | - Jonas T Treebak
- Section of Integrative Physiology, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Joseph A Houmard
- Human Performance Laboratory, Ward Sports Medicine Building, East Carolina University, Greenville, NC, USA.,Department of Kinesiology, East Carolina University, Greenville, NC, USA.,East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC, USA
| |
Collapse
|
23
|
Perry CGR, Hawley JA. Molecular Basis of Exercise-Induced Skeletal Muscle Mitochondrial Biogenesis: Historical Advances, Current Knowledge, and Future Challenges. Cold Spring Harb Perspect Med 2018; 8:cshperspect.a029686. [PMID: 28507194 DOI: 10.1101/cshperspect.a029686] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We provide an overview of groundbreaking studies that laid the foundation for our current understanding of exercise-induced mitochondrial biogenesis and its contribution to human skeletal muscle fitness. We highlight the mechanisms by which skeletal muscle responds to the acute perturbations in cellular energy homeostasis evoked by a single bout of endurance-based exercise and the adaptations resulting from the repeated demands of exercise training that ultimately promote mitochondrial biogenesis through hormetic feedback loops. Despite intense research efforts to elucidate the cellular mechanisms underpinning mitochondrial biogenesis in skeletal muscle, translating this basic knowledge into improved metabolic health at the population level remains a future challenge.
Collapse
Affiliation(s)
- Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario M3J 1P3, Canada
| | - John A Hawley
- Mary MacKillop Institute for Health Research, Australian Catholic University, Melbourne 3000, Australia.,Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Merseyside L3 5UA, United Kingdom
| |
Collapse
|
24
|
Solomon TPJ. Sources of Inter-individual Variability in the Therapeutic Response of Blood Glucose Control to Exercise in Type 2 Diabetes: Going Beyond Exercise Dose. Front Physiol 2018; 9:896. [PMID: 30061841 PMCID: PMC6055062 DOI: 10.3389/fphys.2018.00896] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 06/21/2018] [Indexed: 01/17/2023] Open
Abstract
In the context of type 2 diabetes, inter-individual variability in the therapeutic response of blood glucose control to exercise exists to the extent that some individuals, occasionally referred to as “non-responders,” may not experience therapeutic benefit to their blood glucose control. This narrative review examines the evidence and, more importantly, identifies the sources of such inter-individual variability. In doing so, this review highlights that no randomized controlled trial of exercise has yet prospectively measured inter-individual variability in blood glucose control in individuals with prediabetes or type 2 diabetes. Of the identified sources of inter-individual variability, neither has a prospective randomized controlled trial yet quantified the impact of exercise dose, exercise frequency, exercise type, behavioral/environmental barriers, exercise-meal timing, or anti-hyperglycemic drugs on changes in blood glucose control, in individuals with prediabetes or type 2 diabetes. In addition, there is also an urgent need for prospective trials to identify molecular or physiological predictors of inter-individual variability in the changes in blood glucose control following exercise. Therefore, the narrative identifies critical science gaps that must be filled if exercise scientists are to succeed in optimizing health care policy recommendations for type 2 diabetes, so that the therapeutic benefit of exercise may be maximized for all individuals with, or at risk of, diabetes.
Collapse
Affiliation(s)
- Thomas P J Solomon
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom.,Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, United Kingdom
| |
Collapse
|
25
|
Sabaratnam R, Pedersen AJT, Kristensen JM, Handberg A, Wojtaszewski JFP, Højlund K. Intact regulation of muscle expression and circulating levels of myokines in response to exercise in patients with type 2 diabetes. Physiol Rep 2018; 6:e13723. [PMID: 29924476 PMCID: PMC6009776 DOI: 10.14814/phy2.13723] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 05/06/2018] [Accepted: 05/08/2018] [Indexed: 12/17/2022] Open
Abstract
Regular exercise plays an important role in the prevention and treatment of type 2 diabetes (T2D). The synthesis and secretion of myokines in response to contraction may contribute to the beneficial metabolic effects of exercise. However, some exercise-induced responses may be attenuated in T2D. Here, we investigated whether the effect of acute exercise on selected myokines are impaired in T2D. Skeletal muscle biopsies and blood samples were obtained from 13 men with T2D and 14 weight-matched, glucose-tolerant men before, immediately after and 3-h after acute exercise (60 min cycling) to examine muscle expression and plasma/serum levels of selected myokines. One-hour of exercise increased muscle expression of IL6, FGF21, ANGPTL4, CHI3L1, CTGF and CYR61, of which FGF21, ANGPTL4 and CHI3L1 increased further 3-h into recovery, whereas expression of IL6, CYR61, and CTGF returned to baseline levels. There was no immediate effect of exercise on IL15 expression, but it decreased 3-h into recovery. Plasma IL-6 increased robustly, whereas circulating levels of FGF21, ANGPTL4, IL-15, and CHI3L1 increased only modestly in response to exercise. All returned toward baseline levels 3-h into recovery except for plasma ANGPTL4, which increased further. No significant differences in these responses to exercise were observed between the groups. Our results demonstrate that muscle expression and circulating levels of selected known and putative myokines were equally regulated by acute exercise in patients with T2D and weight-matched controls. This suggests that the potential beneficial metabolic effects of these myokines are not impaired in patients with T2D.
Collapse
Affiliation(s)
- Rugivan Sabaratnam
- Section of Molecular Diabetes & MetabolismInstitute of Clinical ResearchInstitute of Molecular MedicineUniversity of Southern DenmarkOdense CDenmark
- Department of EndocrinologyOdense University HospitalOdense CDenmark
| | | | - Jonas M. Kristensen
- Section of Molecular PhysiologyDepartment of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Aase Handberg
- Department of Clinical BiochemistryAalborg University HospitalAalborgDenmark
- Department of Clinical MedicineAalborg UniversityAalborgDenmark
| | - Jørgen F. P. Wojtaszewski
- Section of Molecular PhysiologyDepartment of Nutrition, Exercise and SportsUniversity of CopenhagenCopenhagenDenmark
| | - Kurt Højlund
- Section of Molecular Diabetes & MetabolismInstitute of Clinical ResearchInstitute of Molecular MedicineUniversity of Southern DenmarkOdense CDenmark
- Department of EndocrinologyOdense University HospitalOdense CDenmark
| |
Collapse
|
26
|
Pérez-Schindler J, Kanhere A, Edwards L, Allwood JW, Dunn WB, Schenk S, Philp A. Exercise and high-fat feeding remodel transcript-metabolite interactive networks in mouse skeletal muscle. Sci Rep 2017; 7:13485. [PMID: 29044196 PMCID: PMC5647435 DOI: 10.1038/s41598-017-14081-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Accepted: 10/05/2017] [Indexed: 01/16/2023] Open
Abstract
Enhanced coverage and sensitivity of next-generation ‘omic’ platforms has allowed the characterization of gene, metabolite and protein responses in highly metabolic tissues, such as, skeletal muscle. A limitation, however, is the capability to determine interaction between dynamic biological networks. To address this limitation, we applied Weighted Analyte Correlation Network Analysis (WACNA) to RNA-seq and metabolomic datasets to identify correlated subnetworks of transcripts and metabolites in response to a high-fat diet (HFD)-induced obesity and/or exercise. HFD altered skeletal muscle lipid profiles and up-regulated genes involved in lipid catabolism, while decreasing 241 exercise-responsive genes related to skeletal muscle plasticity. WACNA identified the interplay between transcript and metabolite subnetworks linked to lipid metabolism, inflammation and glycerophospholipid metabolism that were associated with IL6, AMPK and PPAR signal pathways. Collectively, this novel experimental approach provides an integrative resource to study transcriptional and metabolic networks in skeletal muscle in the context of health and disease.
Collapse
Affiliation(s)
- Joaquín Pérez-Schindler
- MRC-ARUK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, B152TT, UK. .,School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, B152TT, UK. .,Biozentrum, University of Basel, Basel, 4056, Switzerland.
| | - Aditi Kanhere
- School of Biosciences, University of Birmingham, Birmingham, B152TT, UK
| | - Lindsay Edwards
- Respiratory Therapy Area Unit, GlaxoSmithKline Medicines Research Centre, Stevenage, SG1 2NY, UK
| | - J William Allwood
- School of Biosciences, University of Birmingham, Birmingham, B152TT, UK.,Phenome Centre Birmingham, University of Birmingham, Birmingham, B152TT, UK.,Environmental and Biochemical Sciences, The James Hutton Institute, Dundee, DD2 5DA, Scotland
| | - Warwick B Dunn
- School of Biosciences, University of Birmingham, Birmingham, B152TT, UK.,Phenome Centre Birmingham, University of Birmingham, Birmingham, B152TT, UK
| | - Simon Schenk
- Department of Orthopaedic Surgery, University of California San Diego, La Jolla, CA, 92093-0863, USA.,Biomedical Sciences Graduate Program, University of California San Diego, La Jolla, CA, 92093-0863, USA
| | - Andrew Philp
- MRC-ARUK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, B152TT, UK. .,School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, B152TT, UK.
| |
Collapse
|
27
|
Di Meo S, Iossa S, Venditti P. Improvement of obesity-linked skeletal muscle insulin resistance by strength and endurance training. J Endocrinol 2017; 234:R159-R181. [PMID: 28778962 DOI: 10.1530/joe-17-0186] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 06/26/2017] [Indexed: 12/30/2022]
Abstract
Obesity-linked insulin resistance is mainly due to fatty acid overload in non-adipose tissues, particularly skeletal muscle and liver, where it results in high production of reactive oxygen species and mitochondrial dysfunction. Accumulating evidence indicates that resistance and endurance training alone and in combination can counteract the harmful effects of obesity increasing insulin sensitivity, thus preventing diabetes. This review focuses the mechanisms underlying the exercise role in opposing skeletal muscle insulin resistance-linked metabolic dysfunction. It is apparent that exercise acts through two mechanisms: (1) it stimulates glucose transport by activating an insulin-independent pathway and (2) it protects against mitochondrial dysfunction-induced insulin resistance by increasing muscle antioxidant defenses and mitochondrial biogenesis. However, antioxidant supplementation combined with endurance training increases glucose transport in insulin-resistant skeletal muscle in an additive fashion only when antioxidants that are able to increase the expression of antioxidant enzymes and/or the activity of components of the insulin signaling pathway are used.
Collapse
Affiliation(s)
- Sergio Di Meo
- Dipartimento di BiologiaUniversità di Napoli 'Federico II', Napoli, Italy
| | - Susanna Iossa
- Dipartimento di BiologiaUniversità di Napoli 'Federico II', Napoli, Italy
| | - Paola Venditti
- Dipartimento di BiologiaUniversità di Napoli 'Federico II', Napoli, Italy
| |
Collapse
|
28
|
Hinkley JM, Zou K, Park S, Turner K, Zheng D, Houmard JA. Roux-en-Y gastric bypass surgery enhances contraction-mediated glucose metabolism in primary human myotubes. Am J Physiol Endocrinol Metab 2017; 313:E195-E202. [PMID: 28487439 PMCID: PMC5582889 DOI: 10.1152/ajpendo.00413.2016] [Citation(s) in RCA: 7] [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: 11/15/2016] [Revised: 05/02/2017] [Accepted: 05/02/2017] [Indexed: 01/10/2023]
Abstract
Contractile activity (e.g., exercise) evokes numerous metabolic adaptations in human skeletal muscle, including enhanced insulin action and substrate oxidation. However, there is intersubject variation in the physiological responses to exercise, which may be linked with factors such as the degree of obesity. Roux-en-Y gastric bypass (RYGB) surgery reduces body mass in severely obese (body mass index ≥ 40 kg/m2) individuals; however, it is uncertain whether RYGB can potentiate responses to contractile activity in this potentially exercise-resistant population. To examine possible interactions between RYGB and contractile activity, muscle biopsies were obtained from severely obese patients before and after RYGB, differentiated into myotubes, and electrically stimulated, after which changes in insulin action and glucose oxidation were determined. Before RYGB, myotubes were unresponsive to electrical stimulation, as indicated by no changes in insulin-stimulated glycogen synthesis and basal glucose oxidation. However, myotubes from the same patients at 1 mo after RYGB increased insulin-stimulated glycogen synthesis and basal glucose oxidation when subjected to contraction. While unresponsive before surgery, contraction improved insulin-stimulated phosphorylation of AS160 (Thr642, Ser704) after RYGB. These data suggest that RYGB surgery may enhance the ability of skeletal muscle from severely obese individuals to respond to contractile activity.
Collapse
Affiliation(s)
- J Matthew Hinkley
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina
- Department of Kinesiology, East Carolina University, Greenville, North Carolina; and
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
| | - Kai Zou
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina
- Department of Kinesiology, East Carolina University, Greenville, North Carolina; and
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
| | - Sanghee Park
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina
- Department of Kinesiology, East Carolina University, Greenville, North Carolina; and
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
| | - Kristen Turner
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina
- Department of Kinesiology, East Carolina University, Greenville, North Carolina; and
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
| | - Donghai Zheng
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina
- Department of Kinesiology, East Carolina University, Greenville, North Carolina; and
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
| | - Joseph A Houmard
- Human Performance Laboratory, East Carolina University, Greenville, North Carolina;
- Department of Kinesiology, East Carolina University, Greenville, North Carolina; and
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
| |
Collapse
|
29
|
Luo M, Mengos AE, Ma W, Finlayson J, Bustos RZ, Xiao Zhu Y, Shi CX, Stubblefield TM, Willis WT, Mandarino LJ. Characterization of the novel protein KIAA0564 (Von Willebrand Domain-containing Protein 8). Biochem Biophys Res Commun 2017; 487:545-551. [PMID: 28414126 PMCID: PMC5824621 DOI: 10.1016/j.bbrc.2017.04.067] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 04/13/2017] [Indexed: 11/28/2022]
Abstract
The VWA8 gene was first identified by the Kazusa cDNA project and named KIAA0564. Based on the observation, by similarity, that the protein encoded by KIAA0564 contains a Von Willebrand Factor 8 domain, KIAA0564 was named Von Willebrand Domain-containing Protein 8 (VWA8). The function of VWA8 protein is almost unknown. The purpose of this study was to characterize the tissue distribution, cellular location, and function of VWA8. In mice VWA8 protein was mostly distributed in liver, kidney, heart, pancreas and skeletal muscle, and is present as a long isoform and a shorter splice variant (VWA8a and VWA8b). VWA8 protein and mRNA were elevated in mouse liver in response to high fat feeding. Sequence analysis suggests that VWA8 has a mitochondrial targeting sequence and domains responsible for ATPase activity. VWA8 protein was targeted exclusively to mitochondria in mouse AML12 liver cells, and this was prevented by deletion of the targeting sequence. Moreover, the VWA8 short isoform overexpressed in insect cells using a baculovirus construct had in vitro ATPase activity. Deletion of the Walker A motif or Walker B motif in VWA8 mostly blocked ATPase activity, suggesting Walker A motif or Walker B motif are essential to the ATPase activity of VWA8. Finally, homology modeling suggested that VWA8 may have a structure most confidently similar to dynein motor proteins.
Collapse
Affiliation(s)
- Moulun Luo
- Division of Endocrinology, University of Arizona, Tucson, AZ, United States
| | - April E Mengos
- Division of Laboratory Medicine, Mayo Clinic Arizona, Scottsdale, AZ, United States
| | - Wuqiong Ma
- Division of Endocrinology, University of Arizona, Tucson, AZ, United States
| | - Jean Finlayson
- Division of Endocrinology, University of Arizona, Tucson, AZ, United States
| | | | - Yuan Xiao Zhu
- Division of Hematology-Oncology, Mayo Clinic Arizona, Scottsdale, AZ, United States
| | - Chang-Xin Shi
- Division of Hematology-Oncology, Mayo Clinic Arizona, Scottsdale, AZ, United States
| | - Tianna M Stubblefield
- Mouse Metabolic Phenotyping Laboratory, Mayo Clinic Arizona, Scottsdale, AZ, United States
| | - Wayne T Willis
- Division of Endocrinology, University of Arizona, Tucson, AZ, United States
| | | |
Collapse
|
30
|
Deficiency of the hepatokine selenoprotein P increases responsiveness to exercise in mice through upregulation of reactive oxygen species and AMP-activated protein kinase in muscle. Nat Med 2017; 23:508-516. [PMID: 28263310 DOI: 10.1038/nm.4295] [Citation(s) in RCA: 111] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 01/27/2017] [Indexed: 02/05/2023]
Abstract
Exercise has numerous health-promoting effects in humans; however, individual responsiveness to exercise with regard to endurance or metabolic health differs markedly. This 'exercise resistance' is considered to be congenital, with no evident acquired causative factors. Here we show that the anti-oxidative hepatokine selenoprotein P (SeP) causes exercise resistance through its muscle receptor low-density lipoprotein receptor-related protein 1 (LRP1). SeP-deficient mice showed a 'super-endurance' phenotype after exercise training, as well as enhanced reactive oxygen species (ROS) production, AMP-activated protein kinase (AMPK) phosphorylation and peroxisome proliferative activated receptor γ coactivator (Ppargc)-1α (also known as PGC-1α; encoded by Ppargc1a) expression in skeletal muscle. Supplementation with the anti-oxidant N-acetylcysteine (NAC) reduced ROS production and the endurance capacity in SeP-deficient mice. SeP treatment impaired hydrogen-peroxide-induced adaptations through LRP1 in cultured myotubes and suppressed exercise-induced AMPK phosphorylation and Ppargc1a gene expression in mouse skeletal muscle-effects which were blunted in mice with a muscle-specific LRP1 deficiency. Furthermore, we found that increased amounts of circulating SeP predicted the ineffectiveness of training on endurance capacity in humans. Our study suggests that inhibitors of the SeP-LRP1 axis may function as exercise-enhancing drugs to treat diseases associated with a sedentary lifestyle.
Collapse
|
31
|
Intact initiation of autophagy and mitochondrial fission by acute exercise in skeletal muscle of patients with Type 2 diabetes. Clin Sci (Lond) 2016; 131:37-47. [DOI: 10.1042/cs20160736] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 11/10/2016] [Accepted: 11/11/2016] [Indexed: 11/17/2022]
Abstract
The present study finds important steps in the initiation of autophagy and mitochondrial fission are intact in skeletal muscle of patients with Type 2 diabetes (T2D) compared with non-diabetic, weight-matched controls.
Collapse
|
32
|
Mendham AE, Duffield R, Coutts AJ, Marino FE, Boyko A, McAinch AJ, Bishop DJ. Similar mitochondrial signaling responses to a single bout of continuous or small-sided-games-based exercise in sedentary men. J Appl Physiol (1985) 2016; 121:1326-1334. [DOI: 10.1152/japplphysiol.00289.2016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 10/03/2016] [Accepted: 10/09/2016] [Indexed: 12/14/2022] Open
Abstract
This study assessed the mitochondrial related signaling responses to a single bout of noncontact, modified football (touch rugby), played as small-sided games (SSG), or cycling (CYC) exercise in sedentary, obese, middle-aged men. In a randomized, crossover design, nine middle-aged, sedentary, obese men completed two, 40-min exercise conditions (CYC and SSG) separated by a 21-day recovery period. Heart rate (HR) and ratings of perceived exertion (RPE) were collected during each bout. Needle biopsies from the vastus lateralis muscle were collected at rest and 30 and 240 min postexercise for analysis of protein content and phosphorylation (PGC-1α, SIRT1, p53, p53Ser15, AMPK, AMPKThr172, CAMKII, CAMKIIThr286, p38MAPK, and p38MAPKThr180/Tyr182) and mRNA expression (PGC-1α, p53, NRF1, NRF2, Tfam, and cytochrome c). A main effect of time effect for both conditions was evident for HR, RPE, and blood lactate ( P < 0.05), with no condition by time interaction ( P > 0.05). Both conditions increased PGC1-α protein and mRNA expression at 240 min ( P < 0.05). AMPKThr172 increased 30 min post CYC ( P < 0.05), with no change in SSG ( P > 0.05). CYC increased p53 protein content at 240 min to a greater extent than SSG ( P < 0.05). mRNA expression of NRF2 decreased in both conditions ( P < 0.05). No condition by time interactions were evident for mRNA expression of Tfam, NRF1, cytochrome c, and p53. The similar PGC-1α response between intensity-matched conditions suggests both conditions are of similar benefit for stimulating mitochondrial biogenesis. Differences between conditions regarding fluctuation in exercise intensity and type of muscle contraction may explain the increase of p53 and AMPK within CYC and not SSG (noncontact, modified football).
Collapse
Affiliation(s)
- Amy E. Mendham
- Division of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town, Cape Town, South Africa
- School of Exercise Science, Sport and Health, Charles Sturt University, Bathurst, New South Wales, Australia
| | - Rob Duffield
- Sport and Exercise Discipline Group, UTS: Health, University of Technology Sydney (UTS), Moore Park, New South Wales, Australia
| | - Aaron J. Coutts
- Sport and Exercise Discipline Group, UTS: Health, University of Technology Sydney (UTS), Moore Park, New South Wales, Australia
| | - Frank E. Marino
- School of Exercise Science, Sport and Health, Charles Sturt University, Bathurst, New South Wales, Australia
| | - Andriy Boyko
- Sport and Exercise Discipline Group, UTS: Health, University of Technology Sydney (UTS), Moore Park, New South Wales, Australia
| | - Andrew J. McAinch
- Centre for Chronic Diseases, College of Health and Biomedicine, Victoria University, Melbourne, Victoria, Australia
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - David John Bishop
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia
| |
Collapse
|
33
|
Changes in Pre- and Post-Exercise Gene Expression among Patients with Chronic Kidney Disease and Kidney Transplant Recipients. PLoS One 2016; 11:e0160327. [PMID: 27518102 PMCID: PMC4982681 DOI: 10.1371/journal.pone.0160327] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 07/18/2016] [Indexed: 11/19/2022] Open
Abstract
Introduction Decreased insulin sensitivity blunts the normal increase in gene expression from skeletal muscle after exercise. In addition, chronic inflammation decreases insulin sensitivity. Chronic kidney disease (CKD) is an inflammatory state. How CKD and, subsequently, kidney transplantation affects skeletal muscle gene expression after exercise are unknown. Methods Study cohort: non-diabetic male/female 4/1, age 52±2 years, with end-stage CKD who underwent successful kidney transplantation. The following were measured both pre-transplant and post-transplant and compared to normals: Inflammatory markers, euglycemic insulin clamp studies determine insulin sensitivity, and skeletal muscle biopsies performed before and within 30 minutes after an acute exercise protocol. Microarray analyses were performed on the skeletal muscle using the 4x44K Whole Human Genome Microarrays. Since nuclear factor of activated T cells (NFAT) plays an important role in T cell activation and calcineurin inhibitors are mainstay immunosuppression, calcineurin/NFAT pathway gene expression was compared at rest and after exercise. Log transformation was performed to prevent skewing of data and regression analyses comparing measures pre- and post-transplant performed. Result Markers of inflammation significantly improved post-transplantation. Insulin infusion raised glucose disposal slightly lower post-transplant compared to pre-transplant, but not significantly, thus concluding differences in insulin sensitivity were similar. The overall pattern of gene expression in response to exercise was reduced both pre-and post-transplant compared to healthy volunteers. Although significant changes were observed among NFAT/Calcineurin gene at rest and after exercise in normal cohort, there were no significant differences comparing NFAT/calcineurin pathway gene expression pre- and post-transplant. Conclusions Despite an improvement in serum inflammatory markers, no significant differences in glucose disposal were observed post-transplant. The reduced skeletal muscle gene expression, including NFAT/calcineurin gene expression, in response to a single bout of exercise was not improved post-transplant. This study suggests that the improvements in inflammatory mediators post-transplant are unrelated to changes of NFAT/calcineurin gene expression.
Collapse
|
34
|
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.
Collapse
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
| |
Collapse
|
35
|
Malin SK, Liu Z, Barrett EJ, Weltman A. Exercise resistance across the prediabetes phenotypes: Impact on insulin sensitivity and substrate metabolism. Rev Endocr Metab Disord 2016; 17:81-90. [PMID: 27106830 DOI: 10.1007/s11154-016-9352-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Prediabetes is a heterogeneous term that encompasses different origins of insulin resistance and insulin secretion that contribute to distinct patterns of hyperglycemia. In fact, prediabetes is an umbrella term that characterizes individuals at high risk for developing type 2 diabetes (T2D) and/or cardiovascular disease (CVD). Based on current definitions there are at least 3 distinct phenotypes of prediabetes: impaired fasting glucose (IFG), impaired glucose tolerant (IGT), or the combination of both (IFG + IGT). Each phenotype is clinically relevant as they are uniquely recognized as having different levels of risk for progressing to T2D and CVD. Herein, we discuss the underlying pathophysiology that characterizes IFG, IGT and the combination, as well as examine how some of these phenotypes appear resistant to traditional exercise interventions. We propose that substrate metabolism differences between the prediabetes phenotypes may be a unifying mechanism that explains the inter-subject variation in response to exercise seen across obese, metabolic syndrome, pre-diabetic and T2D patients in the current literature. Ultimately, a better understanding of the pathophysiologic mechanisms that govern disturbances responsible for fasting vs. postprandial hyperglycemia and the combination of both is important for designing optimal and personalized exercise treatment strategies that treat and prevent hyperglycemia and CVD risk.
Collapse
Affiliation(s)
- Steven K Malin
- Applied Metabolism & Physiology Laboratory, Department of Kinesiology, University of Virginia, 210 Emmet St., 225A Memorial Gymnasium, Charlottesville, VA, USA.
- Division of Endocrinology and Metabolism, University of Virginia, Charlottesville, VA, USA.
| | - Zhenqi Liu
- Division of Endocrinology and Metabolism, University of Virginia, Charlottesville, VA, USA
| | - Eugene J Barrett
- Division of Endocrinology and Metabolism, University of Virginia, Charlottesville, VA, USA
| | - Arthur Weltman
- Applied Metabolism & Physiology Laboratory, Department of Kinesiology, University of Virginia, 210 Emmet St., 225A Memorial Gymnasium, Charlottesville, VA, USA
- Division of Endocrinology and Metabolism, University of Virginia, Charlottesville, VA, USA
| |
Collapse
|
36
|
Böhm A, Weigert C, Staiger H, Häring HU. Exercise and diabetes: relevance and causes for response variability. Endocrine 2016; 51:390-401. [PMID: 26643313 PMCID: PMC4762932 DOI: 10.1007/s12020-015-0792-6] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 10/28/2015] [Indexed: 12/31/2022]
Abstract
Exercise as a key prevention strategy for diabetes and obesity is commonly accepted and recommended throughout the world. Unfortunately, not all individuals profit to the same extent, some exhibit exercise resistance. This phenomenon of non-response to exercise is found for several endpoints, including glucose tolerance and insulin sensitivity. Since these non-responders are of notable quantity, there is the need to understand the underlying mechanisms and to identify predictors of response. This displays the basis to develop personalized training intervention regimes. In this review, we summarize the current knowledge on response variability, with focus on human studies and improvement of glucose homeostasis as outcome.
Collapse
Affiliation(s)
- Anja Böhm
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Angiology, Nephrology, and Clinical Chemistry, University Hospital Tübingen, Eberhard Karls University Tübingen, 72076, Tübingen, Germany
- Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the Eberhard Karls University Tübingen, Tübingen, Germany
- German Center for Diabetes Research (DZD), 85764, München-Neuherberg, Germany
| | - Cora Weigert
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Angiology, Nephrology, and Clinical Chemistry, University Hospital Tübingen, Eberhard Karls University Tübingen, 72076, Tübingen, Germany
- Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the Eberhard Karls University Tübingen, Tübingen, Germany
- German Center for Diabetes Research (DZD), 85764, München-Neuherberg, Germany
| | - Harald Staiger
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Angiology, Nephrology, and Clinical Chemistry, University Hospital Tübingen, Eberhard Karls University Tübingen, 72076, Tübingen, Germany
- Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the Eberhard Karls University Tübingen, Tübingen, Germany
- German Center for Diabetes Research (DZD), 85764, München-Neuherberg, Germany
| | - Hans-Ulrich Häring
- Department of Internal Medicine IV, Division of Endocrinology, Diabetology, Angiology, Nephrology, and Clinical Chemistry, University Hospital Tübingen, Eberhard Karls University Tübingen, 72076, Tübingen, Germany.
- Institute for Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at the Eberhard Karls University Tübingen, Tübingen, Germany.
- German Center for Diabetes Research (DZD), 85764, München-Neuherberg, Germany.
| |
Collapse
|
37
|
Emanuele Bianchi V, Falcioni G. Reactive oxygen species, health and longevity. AIMS MOLECULAR SCIENCE 2016. [DOI: 10.3934/molsci.2016.4.479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
|
38
|
Affiliation(s)
- Ian R Lanza
- Division of Endocrinology, Mayo Clinic College of Medicine, Rochester, MN
| |
Collapse
|
39
|
Stephens NA, Xie H, Johannsen NM, Church TS, Smith SR, Sparks LM. A transcriptional signature of "exercise resistance" in skeletal muscle of individuals with type 2 diabetes mellitus. Metabolism 2015; 64:999-1004. [PMID: 26163877 PMCID: PMC5267524 DOI: 10.1016/j.metabol.2015.06.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 06/05/2015] [Accepted: 06/11/2015] [Indexed: 10/23/2022]
Abstract
AIMS/HYPOTHESIS Exercise benefits most, but not all, individuals with type 2 diabetes mellitus (T2DM). The aim of this study was to determine whether a proportion of individuals with T2DM would fail to demonstrate exercise-induced metabolic improvements. We hypothesized that this lack of response would be related to their skeletal muscle transcriptional profile. METHODS 42 participants with T2DM from the previously reported HART-D study underwent a 9-month supervised exercise intervention. We performed a principal components analysis to distinguish Responders from Non-Responders (n=9 each) based on: decreases in (1) HbA1c, (2) %fat (3) BMI and (4) increase in skeletal muscle mtDNA. mRNA expression patterns in muscle tissue at baseline were assessed by microarray and qRT-PCR analysis in both groups. RESULTS Of 186 genes identified by microarray analysis, 70% were up-regulated in Responders and down-regulated in Non-Responders. Several genes involved in substrate metabolism and mitochondrial biogenesis were significantly different (fold-change>1.5, p<0.05) between the groups at baseline, indicating a blunted oxidative capacity at baseline in Non-Responders. CONCLUSIONS/INTERPRETATIONS These data suggest that a unique baseline expression pattern of genes involved in muscle fuel metabolism may predict an individual's lack of exercise response in metabolic outcomes, thus allowing exercise interventions to be targeted to these individuals and aid in the identification of novel approaches to treat Non-Responders in the future.
Collapse
Affiliation(s)
- Natalie A Stephens
- Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, FL, USA; Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, FL, USA
| | - Hui Xie
- Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, FL, USA; Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, FL, USA
| | - Neil M Johannsen
- Pennington Biomedical Research Center, Department of Preventive Medicine, Baton Rouge, LA, USA; Louisiana State University, Department of Kinesiology, Baton Rouge, LA, USA
| | - Timothy S Church
- Pennington Biomedical Research Center, Department of Preventive Medicine, Baton Rouge, LA, USA
| | - Steven R Smith
- Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, FL, USA; Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, FL, USA
| | - Lauren M Sparks
- Translational Research Institute for Metabolism and Diabetes, Florida Hospital, Orlando, FL, USA; Diabetes and Obesity Research Center, Sanford-Burnham Medical Research Institute, Orlando, FL, USA.
| |
Collapse
|
40
|
Effect of regional muscle location but not adiposity on mitochondrial biogenesis-regulating proteins. Eur J Appl Physiol 2015; 116:11-8. [DOI: 10.1007/s00421-015-3232-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 07/31/2015] [Indexed: 01/06/2023]
|
41
|
Rugby-specific small-sided games training is an effective alternative to stationary cycling at reducing clinical risk factors associated with the development of type 2 diabetes: a randomized, controlled trial. PLoS One 2015; 10:e0127548. [PMID: 26030423 PMCID: PMC4452519 DOI: 10.1371/journal.pone.0127548] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 04/10/2015] [Indexed: 12/16/2022] Open
Abstract
INTRODUCTION The present study investigated whether rugby small-sided games (SSG) could be an effective alternative to continuous stationary cycling (CYC) training at reducing clinical risk factors associated with the development of type 2 diabetes mellitus (T2DM). METHODS Thirty-three middle-aged (48.6±6.6y), inactive men were randomized into a CYC (n=11), SSG (n=11), or control (CON, n=11) group. Participants trained 3d·wk(-1) for 8 weeks, while control participants maintained normal activity and dietary patterns. Exercise duration was matched between groups, which involved CYC or SSG (four quarters, interspersed with 2-min passive recovery). Both training programs were designed to induce similar internal loads of maximal heart rate (~80-85%HRmax) and rating of perceived exertion. Pre- and post-intervention testing included dual-energy x-ray absorptiometry scan, graded exercise test, fasting 2 h oral glucose tolerance test and resting muscle biopsy. Western blotting was used to assess the content of skeletal muscle proteins associated with mitochondrial biogenesis and glucose regulation. RESULTS Both CYC and SSG increased VO2 at 80%HRmax, and reduced glycated haemoglobin, glucose area under the curve (AUC; SSG, -2.3±2.4; CYC -2.2±1.6 mmol·L(1)(120 min)(1); p<0.05), and total body fat-mass (SSG -2.6±0.9%; CYC -2.9±1.1%), compared to no change in CON (p<0.05). SSG reduced insulin AUC (-30.4±40.7 µlU·mL(1)(120 min)(1); p<0.05) and increased total body fat-free mass (1.1±1.2 kg; p<0.05), with no change in CYC or CON (P>0.05). There were no differences within or between conditions for protein content of peroxisome proliferator-activated receptor gamma coactivator-1α, sirtuin-1, p53, glucose transporter-4, protein kinase AKT/PKB, myocyte enhancer factor 2A, mitochondrial transcription factor, nuclear respiratory factor (NRF)-1, NRF-2 or mitochondrial complexes I-V (p>0.05). CONCLUSION Rugby small-sided games is an effective alternative to continuous cycling for improving metabolic risk-factors associated with the prevention of T2DM. Despite such positive adaptations in clinical risk factors, there were no changes in the content of skeletal muscle proteins associated with glucose regulation and mitochondrial biogenesis. TRIAL REGISTRATION Australian New Zealand Clinical Trial Registry ACTRN12613000874718.
Collapse
|
42
|
McLean CS, Mielke C, Cordova JM, Langlais PR, Bowen B, Miranda D, Coletta DK, Mandarino LJ. Gene and MicroRNA Expression Responses to Exercise; Relationship with Insulin Sensitivity. PLoS One 2015; 10:e0127089. [PMID: 25984722 PMCID: PMC4436215 DOI: 10.1371/journal.pone.0127089] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Accepted: 04/10/2015] [Indexed: 02/07/2023] Open
Abstract
Background Healthy individuals on the lower end of the insulin sensitivity spectrum also have a reduced gene expression response to exercise for specific genes. The goal of this study was to determine the relationship between insulin sensitivity and exercise-induced gene expression in an unbiased, global manner. Methods and Findings Euglycemic clamps were used to measure insulin sensitivity and muscle biopsies were done at rest and 30 minutes after a single acute exercise bout in 14 healthy participants. Changes in mRNA expression were assessed using microarrays, and miRNA analysis was performed in a subset of 6 of the participants using sequencing techniques. Following exercise, 215 mRNAs were changed at the probe level (Bonferroni-corrected P<0.00000115). Pathway and Gene Ontology analysis showed enrichment in MAP kinase signaling, transcriptional regulation and DNA binding. Changes in several transcription factor mRNAs were correlated with insulin sensitivity, including MYC, r=0.71; SNF1LK, r=0.69; and ATF3, r= 0.61 (5 corrected for false discovery rate). Enrichment in the 5’-UTRs of exercise-responsive genes suggested regulation by common transcription factors, especially EGR1. miRNA species of interest that changed after exercise included miR-378, which is located in an intron of the PPARGC1B gene. Conclusions These results indicate that transcription factor gene expression responses to exercise depend highly on insulin sensitivity in healthy people. The overall pattern suggests a coordinated cycle by which exercise and insulin sensitivity regulate gene expression in muscle.
Collapse
Affiliation(s)
- Carrie S. McLean
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Clinton Mielke
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Jeanine M. Cordova
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Paul R. Langlais
- Mayo Clinic in Arizona, Scottsdale, Arizona, United States of America
| | - Benjamin Bowen
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Danielle Miranda
- Mayo Clinic in Arizona, Scottsdale, Arizona, United States of America
| | - Dawn K. Coletta
- School of Life Sciences, Arizona State University, Tempe, Arizona, United States of America
| | - Lawrence J. Mandarino
- School for the Science of Health Care Delivery, Arizona State University, Tempe, Arizona, United States of America
- Mayo Clinic in Arizona, Scottsdale, Arizona, United States of America
- * E-mail:
| |
Collapse
|
43
|
Diabetes and stem cell function. BIOMED RESEARCH INTERNATIONAL 2015; 2015:592915. [PMID: 26075247 PMCID: PMC4449886 DOI: 10.1155/2015/592915] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 12/01/2014] [Indexed: 12/30/2022]
Abstract
Diabetes mellitus is one of the most common serious metabolic diseases that results in hyperglycemia due to defects of insulin secretion or insulin action or both. The present review focuses on the alterations to the diabetic neuronal tissues and skeletal muscle, including stem cells in both tissues, and the preventive effects of physical activity on diabetes. Diabetes is associated with various nervous disorders, such as cognitive deficits, depression, and Alzheimer's disease, and that may be caused by neural stem cell dysfunction. Additionally, diabetes induces skeletal muscle atrophy, the impairment of energy metabolism, and muscle weakness. Similar to neural stem cells, the proliferation and differentiation are attenuated in skeletal muscle stem cells, termed satellite cells. However, physical activity is very useful for preventing the diabetic alteration to the neuronal tissues and skeletal muscle. Physical activity improves neurogenic capacity of neural stem cells and the proliferative and differentiative abilities of satellite cells. The present review proposes physical activity as a useful measure for the patients in diabetes to improve the physiological functions and to maintain their quality of life. It further discusses the use of stem cell-based approaches in the context of diabetes treatment.
Collapse
|
44
|
Belalcazar LM, Papandonatos GD, McCaffery JM, Peter I, Pajewski NM, Erar B, Allred ND, Balasubramanyam A, Bowden DW, Brautbar A, Pi-Sunyer FX, Ballantyne CM, Huggins GS. A common variant in the CLDN7/ELP5 locus predicts adiponectin change with lifestyle intervention and improved fitness in obese individuals with diabetes. Physiol Genomics 2015; 47:215-24. [PMID: 25759378 DOI: 10.1152/physiolgenomics.00109.2014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Accepted: 03/10/2015] [Indexed: 01/19/2023] Open
Abstract
Overweight/obese individuals with Type 2 diabetes have low adiponectin levels, which may improve with lifestyle changes. We investigated whether genetic variants associated with adiponectin levels in genome-wide association studies (GWAS) would also be related with adiponectin changes in response to an intensive lifestyle intervention (ILI), potentially through mechanisms altering the adipose microenvironment via weight loss and/or improved cardiorespiratory fitness. Look AHEAD was a randomized trial comparing the cardiovascular benefits of ILI-induced weight loss and physical activity compared with diabetes support and education among overweight/obese individuals with Type 2 diabetes. In a subsample of Look AHEAD with adiponectin data and genetic consent (n=1,351), we evaluated the effects of 24 genetic variants, demonstrated by GWAS to be cross-sectionally associated with adiponectin, on adiponectin change 1-yr postintervention. We explored via mediational analyses whether any differential effects by treatment arm were occurring through weight loss and/or improved fitness. A variant, rs222857, in the CLDN7 locus, potentially associated with epithelial barrier integrity and tight junction physiology, and a putative cis expression quantitative trail locus for elongator acetyltransferase complex subunit 5 (ELP5), predicted adiponectin increases within ILI (log-adiponectin in overall sample per copy: β±SE=0.05±0.02, P=0.008; in non-Hispanic whites: 0.06±0.02, P=0.009). The favorable effects of rs222857 (minor allele frequency 45.5%) appeared to be mediated by mechanisms associated with improved fitness, and not weight loss. This is the first study to identify a genetic variant that modifies adiponectin response to lifestyle intervention in overweight/obese diabetic individuals.
Collapse
Affiliation(s)
- L Maria Belalcazar
- Department of Medicine, University of Texas Medical Branch, Galveston, Texas;
| | | | - Jeanne M McCaffery
- Weight Control and Diabetes Research Center, Department of Psychiatry and Human Behavior, The Miriam Hospital and Brown Medical School, Providence, Rhode Island
| | - Inga Peter
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Nicholas M Pajewski
- Department of Biostatistical Sciences, Wake Forest University Health Sciences, Winston-Salem, North Carolina
| | - Bahar Erar
- Department of Biostatistics, Brown University, Providence, Rhode Island
| | - Nicholette D Allred
- Department of Biochemistry and Center for Genomics and Personalized Medicine Research, Wake Forest University Health Sciences, Winston-Salem, North Carolina
| | | | - Donald W Bowden
- Department of Biochemistry and Center for Genomics and Personalized Medicine Research, Wake Forest University Health Sciences, Winston-Salem, North Carolina
| | - Ariel Brautbar
- Department of Medicine, Baylor College of Medicine, Houston, Texas
| | - F Xavier Pi-Sunyer
- Department of Medicine, Columbia University, St. Luke's-Roosevelt Hospital, New York, New York
| | - Christie M Ballantyne
- Department of Medicine, Baylor College of Medicine, Houston, Texas; Center for Cardiovascular Disease Prevention, Methodist De Bakey Heart and Vascular Center, Houston, Texas; and
| | - Gordon S Huggins
- MCRI Center for Translational Genomics, Tufts Medical Center, Boston, Massachusetts
| | | |
Collapse
|
45
|
Manna P, Jain SK. Phosphatidylinositol-3,4,5-triphosphate and cellular signaling: implications for obesity and diabetes. Cell Physiol Biochem 2015; 35:1253-75. [PMID: 25721445 DOI: 10.1159/000373949] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/07/2015] [Indexed: 12/26/2022] Open
Abstract
Phosphatidylinositol-3,4,5-triphosphate (PtdIns(3,4,5)P₃) is one of the most important phosphoinositides and is capable of activating a wide range of proteins through its interaction with their specific binding domains. Localization and activation of these effector proteins regulate a number of cellular functions, including cell survival, proliferation, cytoskeletal rearrangement, intracellular vesicle trafficking, and cell metabolism. Phosphoinositides have been investigated as an important agonist-dependent second messenger in the regulation of diverse physiological events depending upon the phosphorylation status of their inositol group. Dysregulation in formation as well as metabolism of phosphoinositides is associated with various pathophysiological disorders such as inflammation, allergy, cardiovascular diseases, cancer, and metabolic diseases. Recent studies have demonstrated that the impaired metabolism of PtdIns(3,4,5)P₃ is a prime mediator of insulin resistance associated with various metabolic diseases including obesity and diabetes. This review examines the current status of the role of PtdIns(3,4,5)P₃ signaling in the regulation of various cellular functions and the implications of dysregulated PtdIns(3,4,5)P₃ signaling in obesity, diabetes, and their associated complications.
Collapse
Affiliation(s)
- Prasenjit Manna
- Department of Pediatrics, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | | |
Collapse
|
46
|
Larsen S, Skaaby S, Helge JW, Dela F. Effects of exercise training on mitochondrial function in patients with type 2 diabetes. World J Diabetes 2014; 5:482-492. [PMID: 25126394 PMCID: PMC4127583 DOI: 10.4239/wjd.v5.i4.482] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 04/24/2014] [Accepted: 06/11/2014] [Indexed: 02/05/2023] Open
Abstract
Type 2 diabetes is characterized by a decreased ability of insulin to facilitate glucose uptake into insulin sensitive tissue, i.e., skeletal muscle. The mechanism behind this is at the moment unresolved. It has been suggested that increased amount of lipids inside the skeletal muscle (intramuscular triglyceride, diacylglycerol and ceramides) will impair insulin action in skeletal muscle, but data are not consistent in the human literature. It has also been hypothesized that the impaired insulin sensitivity is due to a dysfunction in the mitochondria resulting in an impaired ability to oxidize lipids, but the majority of the literature is not supporting this hypothesis. Recently it has been suggested that the production of reactive oxygen species play an essential role in skeletal muscle insulin sensitivity. It is well accepted that physical activity (endurance, strength and high intensity training) improves insulin sensitivity in healthy humans and in patients with type 2 diabetes. Whether patients with type 2 diabetes have the same beneficial effects (same improvement) as control subjects, when it comes to regular physical activity in regard to mitochondrial function, is not established in the literature. This review will focus only on the effect of physical activity on skeletal muscle (mitochondrial function) in patients with type 2 diabetes.
Collapse
|
47
|
Howard EN, Frierson GM, Willis BL, Haskell WL, Powell-Wiley TM, Defina LF. The impact of race and higher socioeconomic status on cardiorespiratory fitness. Med Sci Sports Exerc 2014; 45:2286-91. [PMID: 23698239 DOI: 10.1249/mss.0b013e31829c2f4f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
PURPOSE Previous studies suggest that African Americans (AA) have lower levels of cardiorespiratory fitness (CRF) than their Caucasian (C) counterparts. However, the association between CRF and race/ethnicity in the context of higher socioeconomic status (SES) has not been explored. METHODS We evaluated 589 AA (309 men and 203 women) and 33,015 C (19,399 men and 8753 women) enrolled in the Cooper Center Longitudinal Study. Education years and access to a preventive health care examination were used as a proxy for higher SES. Data were collected from a questionnaire, maximal treadmill exercise stress test, and other clinical measures. The outcome variable was CRF, which was stratified into low fit (quintile 1 of CRF) and fit (quintiles 2-5). Multivariable regression was used to compare adjusted mean CRF between groups. P values were adjusted for unbalanced sample size and unequal variance between groups. RESULTS The mean education years were similar for AA and C men at 16 yr; however, AA women had more years of education than C (15.8 vs 15.2 yr, P = 0.0062). AA men and women had a significantly higher prevalence of being unfit compared with their C counterparts (men 26.7% vs 12.6%, P < 0.0001; women 21.3% vs 8.4%, P < 0.0001). The adjusted mean estimated maximal METs were 10.9 vs 11.7 and 8.8 vs 9.8 for AA and C men and women, respectively. Fully adjusted odds ratios revealed that AA men had more than twice the risk of being unfit compared with C men. A trend persisted for AA women to have a lower MET value than their counterparts. CONCLUSIONS Despite comparable higher SES, lower CRF existed among AA men versus C men. These results suggest that CRF may not be mediated strictly by environmental factors related to SES.
Collapse
Affiliation(s)
- Erica N Howard
- 1The Cooper Institute, Dallas, TX; 2Department of Psychology, Howard University, Washington, DC; 3Prevention Research Center, Department of Medicine, Stanford University, Palo Alto, CA; and 4Cardiovascular Pulmonary Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD
| | | | | | | | | | | |
Collapse
|
48
|
Ferraro E, Giammarioli AM, Chiandotto S, Spoletini I, Rosano G. Exercise-induced skeletal muscle remodeling and metabolic adaptation: redox signaling and role of autophagy. Antioxid Redox Signal 2014; 21:154-76. [PMID: 24450966 PMCID: PMC4048572 DOI: 10.1089/ars.2013.5773] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
SIGNIFICANCE Skeletal muscle is a highly plastic tissue. Exercise evokes signaling pathways that strongly modify myofiber metabolism and physiological and contractile properties of skeletal muscle. Regular physical activity is beneficial for health and is highly recommended for the prevention of several chronic conditions. In this review, we have focused our attention on the pathways that are known to mediate physical training-induced plasticity. RECENT ADVANCES An important role for redox signaling has recently been proposed in exercise-mediated muscle remodeling and peroxisome proliferator-activated receptor γ (PPARγ) coactivator-1α (PGC-1α) activation. Still more currently, autophagy has also been found to be involved in metabolic adaptation to exercise. CRITICAL ISSUES Both redox signaling and autophagy are processes with ambivalent effects; they can be detrimental and beneficial, depending on their delicate balance. As such, understanding their role in the chain of events induced by exercise and leading to skeletal muscle remodeling is a very complicated matter. Moreover, the study of the signaling induced by exercise is made even more difficult by the fact that exercise can be performed with several different modalities, with this having different repercussions on adaptation. FUTURE DIRECTIONS Unraveling the complexity of the molecular signaling triggered by exercise on skeletal muscle is crucial in order to define the therapeutic potentiality of physical training and to identify new pharmacological compounds that are able to reproduce some beneficial effects of exercise. In evaluating the effect of new "exercise mimetics," it will also be necessary to take into account the involvement of reactive oxygen species, reactive nitrogen species, and autophagy and their controversial effects.
Collapse
Affiliation(s)
- Elisabetta Ferraro
- 1 Pathophysiology and Treatment of Muscle Wasting Disorders Unit, IRCCS San Raffaele Pisana , Rome, Italy
| | | | | | | | | |
Collapse
|
49
|
Mielke C, Lefort N, McLean C, Cordova JM, Langlais PR, Bordner AJ, Te JA, Ozkan SB, Willis WT, Mandarino LJ. Adenine nucleotide translocase is acetylated in vivo in human muscle: Modeling predicts a decreased ADP affinity and altered control of oxidative phosphorylation. Biochemistry 2014; 53:3817-29. [PMID: 24884163 PMCID: PMC4067143 DOI: 10.1021/bi401651e] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Proteomics techniques have revealed that lysine acetylation is abundant in mitochondrial proteins. This study was undertaken (1) to determine the relationship between mitochondrial protein acetylation and insulin sensitivity in human skeletal muscle, identifying key acetylated proteins, and (2) to use molecular modeling techniques to understand the functional consequences of acetylation of adenine nucleotide translocase 1 (ANT1), which we found to be abundantly acetylated. Eight lean and eight obese nondiabetic subjects had euglycemic clamps and muscle biopsies for isolation of mitochondrial proteins and proteomics analysis. A number of acetylated mitochondrial proteins were identified in muscle biopsies. Overall, acetylation of mitochondrial proteins was correlated with insulin action (r = 0.60; P < 0.05). Of the acetylated proteins, ANT1, which catalyzes ADP-ATP exchange across the inner mitochondrial membrane, was acetylated at lysines 10, 23, and 92. The extent of acetylation of lysine 23 decreased following exercise, depending on insulin sensitivity. Molecular dynamics modeling and ensemble docking simulations predicted the ADP binding site of ANT1 to be a pocket of positively charged residues, including lysine 23. Calculated ADP-ANT1 binding affinities were physiologically relevant and predicted substantial reductions in affinity upon acetylation of lysine 23. Insertion of these derived binding affinities as parameters into a complete mathematical description of ANT1 kinetics predicted marked reductions in adenine nucleotide flux resulting from acetylation of lysine 23. Therefore, acetylation of ANT1 could have dramatic physiological effects on ADP-ATP exchange. Dysregulation of acetylation of mitochondrial proteins such as ANT1 therefore could be related to changes in mitochondrial function that are associated with insulin resistance.
Collapse
Affiliation(s)
- Clinton Mielke
- Center for Metabolic and Vascular
Biology, Arizona State University, Tempe, Arizona 85004, United States
| | - Natalie Lefort
- Center for Metabolic and Vascular
Biology, Arizona State University, Tempe, Arizona 85004, United States
| | - Carrie
G. McLean
- Center for Metabolic and Vascular
Biology, Arizona State University, Tempe, Arizona 85004, United States
| | - Jeanine M. Cordova
- Center for Metabolic and Vascular
Biology, Arizona State University, Tempe, Arizona 85004, United States
| | - Paul R. Langlais
- Division of Endocrinology, Mayo Clinic
in Arizona, Scottsdale, Arizona 85259, United
States
| | - Andrew J. Bordner
- Division of Endocrinology, Mayo Clinic
in Arizona, Scottsdale, Arizona 85259, United
States
| | - Jerez A. Te
- Division of Endocrinology, Mayo Clinic
in Arizona, Scottsdale, Arizona 85259, United
States
| | - S. Banu Ozkan
- Center for Metabolic and Vascular
Biology, Arizona State University, Tempe, Arizona 85004, United States
| | - Wayne T. Willis
- Center for Metabolic and Vascular
Biology, Arizona State University, Tempe, Arizona 85004, United States
| | - Lawrence J. Mandarino
- Center for Metabolic and Vascular
Biology, Arizona State University, Tempe, Arizona 85004, United States
- Division of Endocrinology, Mayo Clinic
in Arizona, Scottsdale, Arizona 85259, United
States
- Department of Medicine, Mayo
Clinic in Arizona, Scottsdale, Arizona 85259, United States
- Mayo Clinic in Arizona, 13400 E.
Shea Blvd., Scottsdale, AZ 85259. E-mail: . Phone: (480) 965-8365. Fax: (480) 965-6899
| |
Collapse
|
50
|
Miranda DN, Coletta DK, Mandarino LJ, Shaibi GQ. Increases in insulin sensitivity among obese youth are associated with gene expression changes in whole blood. Obesity (Silver Spring) 2014; 22:1337-44. [PMID: 24470352 PMCID: PMC4008712 DOI: 10.1002/oby.20711] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Accepted: 01/22/2014] [Indexed: 01/02/2023]
Abstract
OBJECTIVE Lifestyle intervention can improve insulin sensitivity in obese youth, yet few studies have examined the molecular signatures associated with these improvements. Therefore, the purpose of this study was to explore gene expression changes in whole blood that are associated with intervention-induced improvements in insulin sensitivity. METHODS Fifteen (7M/8F) overweight/obese (BMI percentile = 96.3 ± 1.1) Latino adolescents (15.0 ± 0.9 years) completed a 12-week lifestyle intervention that included weekly nutrition education and 180 minutes of moderate-vigorous exercise per week. Insulin sensitivity was estimated by an oral glucose tolerance test and the Matsuda Index. Global microarray analysis profiling from whole blood was performed to examine changes in gene expression and to explore biological pathways that were significantly changed in response to the intervention. RESULTS A total of 1,459 probes corresponding to mRNA transcripts (717 up, 742 down) were differentially expressed with a fold change ≥1.2. These genes were mapped within eight significant pathways identified, including insulin signaling, type 1 diabetes, and glycerophospholipid metabolism. Participants with increased insulin sensitivity exhibited five times the number of significant genes altered compared with nonresponders (1,144 vs. 230). CONCLUSIONS These findings suggest that molecular signatures from whole blood are associated with lifestyle-induced health improvements among high-risk Latino youth.
Collapse
Affiliation(s)
- Danielle N. Miranda
- Mayo Graduate School, Mayo Clinic, Rochester, MN
- Mayo/ASU Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona
| | - Dawn K. Coletta
- School of Life Science, Arizona State University, Tempe, AZ
- Mayo/ASU Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona
| | - Lawrence J. Mandarino
- School of Life Science, Arizona State University, Tempe, AZ
- Mayo/ASU Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona
| | - Gabriel Q. Shaibi
- Mayo/ASU Center for Metabolic and Vascular Biology, Arizona State University, Tempe, Arizona
- College of Nursing and Health Innovation, Arizona State University, Phoenix, AZ
- Southwest Interdisciplinary Research Center, Arizona State University, Phoenix, AZ
| |
Collapse
|