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Delfinis LJ, Ogilvie LM, Khajehzadehshoushtar S, Gandhi S, Garibotti MC, Thuhan AK, Matuszewska K, Pereira M, Jones RG, Cheng AJ, Hawke TJ, Greene NP, Murach KA, Simpson JA, Petrik J, Perry CGR. Muscle weakness and mitochondrial stress occur before metastasis in a novel mouse model of ovarian cancer cachexia. bioRxiv 2024:2024.04.08.588639. [PMID: 38645227 PMCID: PMC11030380 DOI: 10.1101/2024.04.08.588639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
Objectives A high proportion of women with advanced epithelial ovarian cancer (EOC) experience weakness and cachexia. This relationship is associated with increased morbidity and mortality. EOC is the most lethal gynecological cancer, yet no preclinical cachexia model has demonstrated the combined hallmark features of metastasis, ascites development, muscle loss and weakness in adult immunocompetent mice. Methods Here, we evaluated a new model of ovarian cancer-induced cachexia with the advantages of inducing cancer in adult immunocompetent C57BL/6J mice through orthotopic injections of EOC cells in the ovarian bursa. We characterized the development of metastasis, ascites, muscle atrophy, muscle weakness, markers of inflammation, and mitochondrial stress in the tibialis anterior (TA) and diaphragm ∼45, ∼75 and ∼90 days after EOC injection. Results Primary ovarian tumour sizes were progressively larger at each time point while robust metastasis, ascites development, and reductions in body, fat and muscle weights occurred by 90 Days. There were no changes in certain inflammatory (TNFα), atrogene (MURF1 and Atrogin) or GDF15 markers within both muscles whereas IL-6 was increased at 45 and 90 Day groups in the diaphragm. TA weakness in 45 Day preceded atrophy and metastasis that were observed later (75 and 90 Day, respectively). The diaphragm demonstrated both weakness and atrophy in 45 Day. In both muscles, this pre-metastatic muscle weakness corresponded with considerable reprogramming of gene pathways related to mitochondrial bioenergetics as well as reduced functional measures of mitochondrial pyruvate oxidation and creatine-dependent ADP/ATP cycling as well as increased reactive oxygen species emission (hydrogen peroxide). Remarkably, muscle force per unit mass at 90 days was partially restored in the TA despite the presence of atrophy and metastasis. In contrast, the diaphragm demonstrated progressive weakness. At this advanced stage, mitochondrial pyruvate oxidation in both muscles exceeded control mice suggesting an apparent metabolic super-compensation corresponding with restored indices of creatine-dependent adenylate cycling. Conclusion This mouse model demonstrates the concurrent development of cachexia and metastasis that occurs in women with EOC. The model provides physiologically relevant advantages of inducing tumour development within the ovarian bursa in immunocompetent adult mice. Moreover, the model reveals that muscle weakness in both TA and diaphragm precedes metastasis while weakness also precedes atrophy in the TA. An underlying mitochondrial bioenergetic stress corresponded with this early weakness. Collectively, these discoveries can direct new research towards the development of therapies that target pre-atrophy and pre-metastatic weakness during EOC in addition to therapies targeting cachexia. Highlights This study reports the first orthotopic model of metastatic ovarian cancer cachexia that can be induced in adult immunocompetent miceDiaphragm and limb muscle weakness precedes metastasis and atrophy during ovarian cancerSkeletal muscle mitochondrial oxidative and redox stress signatures occur during pre-metastatic stages of ovarian cancerSpecific muscle force as well as mitochondrial pyruvate oxidation and creatine metabolism demonstrate compensation in later stagesOvarian cancer has heterogeneous effects on distinct muscle types across time.
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Bellissimo CA, Gandhi S, Castellani LN, Murugathasan M, Delfinis LJ, Thuhan A, Garibotti MC, Seo Y, Rebalka IA, Hsu HH, Sweeney G, Hawke TJ, Abdul-Sater AA, Perry CGR. The slow-release adiponectin analog ALY688-SR modifies early-stage disease development in the D2. mdx mouse model of Duchenne muscular dystrophy. Am J Physiol Cell Physiol 2024; 326:C1011-C1026. [PMID: 38145301 DOI: 10.1152/ajpcell.00638.2023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 12/18/2023] [Accepted: 12/18/2023] [Indexed: 12/26/2023]
Abstract
Fibrosis is associated with respiratory and limb muscle atrophy in Duchenne muscular dystrophy (DMD). Current standard of care partially delays the progression of this myopathy but there remains an unmet need to develop additional therapies. Adiponectin receptor agonism has emerged as a possible therapeutic target to lower inflammation and improve metabolism in mdx mouse models of DMD but the degree to which fibrosis and atrophy are prevented remain unknown. Here, we demonstrate that the recently developed slow-release peptidomimetic adiponectin analog, ALY688-SR, remodels the diaphragm of murine model of DMD on DBA background (D2.mdx) mice treated from days 7-28 of age during early stages of disease. ALY688-SR also lowered interleukin-6 (IL-6) mRNA but increased IL-6 and transforming growth factor-β1 (TGF-β1) protein contents in diaphragm, suggesting dynamic inflammatory remodeling. ALY688-SR alleviated mitochondrial redox stress by decreasing complex I-stimulated H2O2 emission. Treatment also attenuated fibrosis, fiber type-specific atrophy, and in vitro diaphragm force production in diaphragm suggesting a complex relationship between adiponectin receptor activity, muscle remodeling, and force-generating properties during the very early stages of disease progression in murine model of DMD on DBA background (D2.mdx) mice. In tibialis anterior, the modest fibrosis at this young age was not altered by treatment, and atrophy was not apparent at this young age. These results demonstrate that short-term treatment of ALY688-SR in young D2.mdx mice partially prevents fibrosis and fiber type-specific atrophy and lowers force production in the more disease-apparent diaphragm in relation to lower mitochondrial redox stress and heterogeneous responses in certain inflammatory markers. These diverse muscle responses to adiponectin receptor agonism in early stages of DMD serve as a foundation for further mechanistic investigations.NEW & NOTEWORTHY There are limited therapies for the treatment of Duchenne muscular dystrophy. As fibrosis involves an accumulation of collagen that replaces muscle fibers, antifibrotics may help preserve muscle function. We report that the novel adiponectin receptor agonist ALY688-SR prevents fibrosis in the diaphragm of D2.mdx mice with short-term treatment early in disease progression. These responses were related to altered inflammation and mitochondrial functions and serve as a foundation for the development of this class of therapy.
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MESH Headings
- Animals
- Mice
- Mice, Inbred mdx
- Muscular Dystrophy, Duchenne/drug therapy
- Muscular Dystrophy, Duchenne/genetics
- Muscular Dystrophy, Duchenne/pathology
- Adiponectin/genetics
- Disease Models, Animal
- Interleukin-6/metabolism
- Mice, Inbred C57BL
- Hydrogen Peroxide/metabolism
- Receptors, Adiponectin/genetics
- Receptors, Adiponectin/metabolism
- Mice, Inbred DBA
- Muscle, Skeletal/metabolism
- Diaphragm/metabolism
- Fibrosis
- Inflammation/metabolism
- Disease Progression
- Atrophy/metabolism
- Atrophy/pathology
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Affiliation(s)
- Catherine A Bellissimo
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Shivam Gandhi
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Laura N Castellani
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Mayoorey Murugathasan
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Luca J Delfinis
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Arshdeep Thuhan
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Madison C Garibotti
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Yeji Seo
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Irena A Rebalka
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Henry H Hsu
- Allysta Pharmaceuticals Inc, Bellevue, Washington, United States
| | - Gary Sweeney
- Department of Biology, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Ali A Abdul-Sater
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
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3
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Bellissimo CA, Castellani LN, Finch MS, Murugathasan M, Gandhi S, Sweeney G, Abdul‐Sater AA, MacPherson REK, Perry CGR. Memory impairment in the D2.mdx mouse model of Duchenne muscular dystrophy is prevented by the adiponectin receptor agonist ALY688. Exp Physiol 2023; 108:1108-1117. [PMID: 37415288 PMCID: PMC10988430 DOI: 10.1113/ep091274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 06/20/2023] [Indexed: 07/08/2023]
Abstract
NEW FINDINGS What is the central question of this study? Can adiponectin receptor agonism improve recognition memory in a mouse model of Duchenne muscular dystrophy? What is the main finding and its importance? Short-term treatment with the new adiponectin receptor agonist ALY688 improves recognition memory in D2.mdx mice. This finding suggests that further investigation into adiponectin receptor agonism is warranted, given that there remains an unmet need for clinical approaches to treat this cognitive dysfunction in people with Duchenne muscular dystrophy. ABSTRACT Memory impairments have been well documented in people with Duchenne muscular dystrophy (DMD). However, the underlying mechanisms are poorly understood, and there is an unmet need to develop new therapies to treat this condition. Using a novel object recognition test, we show that recognition memory impairments in D2.mdx mice are completely prevented by daily treatment with the new adiponectin receptor agonist ALY688 from day 7 to 28 of age. In comparison to age-matched wild-type mice, untreated D2.mdx mice demonstrated lower hippocampal mitochondrial respiration (carbohydrate substrate), greater serum interleukin-6 cytokine content and greater hippocampal total tau and Raptor protein contents. Each of these measures was partly or fully preserved after treatment with ALY688. Collectively, these results indicate that adiponectin receptor agonism improves recognition memory in young D2.mdx mice.
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Affiliation(s)
- Catherine A. Bellissimo
- School of Kinesiology & Health ScienceYork UniversityTorontoONCanada
- Muscle Health Research CentreYork UniversityTorontoCanada
| | - Laura N. Castellani
- School of Kinesiology & Health ScienceYork UniversityTorontoONCanada
- Muscle Health Research CentreYork UniversityTorontoCanada
| | - Michael S. Finch
- Department of Health SciencesBrock UniversitySt CatharinesONCanada
| | - Mayoorey Murugathasan
- School of Kinesiology & Health ScienceYork UniversityTorontoONCanada
- Muscle Health Research CentreYork UniversityTorontoCanada
| | - Shivam Gandhi
- School of Kinesiology & Health ScienceYork UniversityTorontoONCanada
- Muscle Health Research CentreYork UniversityTorontoCanada
| | - Gary Sweeney
- Muscle Health Research CentreYork UniversityTorontoCanada
- Department of BiologyYork UniversityTorontoOntarioCanada
| | - Ali A. Abdul‐Sater
- School of Kinesiology & Health ScienceYork UniversityTorontoONCanada
- Muscle Health Research CentreYork UniversityTorontoCanada
| | | | - Christopher G. R. Perry
- School of Kinesiology & Health ScienceYork UniversityTorontoONCanada
- Muscle Health Research CentreYork UniversityTorontoCanada
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4
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Garibotti MC, Perry CGR. Strength athletes and mitochondria: It's about 'time'. J Physiol 2023. [PMID: 37306149 DOI: 10.1113/jp284856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 06/08/2023] [Indexed: 06/13/2023] Open
Affiliation(s)
- Madison C Garibotti
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
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Brown J, Perry CGR, Prior T, Phillips SM, Skelly LE, Josse AR. Differential plasma branched-chain amino acid responses following the consumption of Greek-style yogurt and skimmed milk. Appl Physiol Nutr Metab 2023. [PMID: 36989535 DOI: 10.1139/apnm-2022-0416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
We examined postprandial branched-chain amino acid (BCAA), insulin and glucose responses in blood for 4 hours following the consumption of two isonitrogenous doses (2x20g protein) of Greek-style yogurt (GY) and skimmed milk (MILK) in young males. Peak leucine and BCAA concentrations and areas under the curve were greater after GY versus MILK, and time to maximal leucine/BCAA concentrations was similar between conditions. We demonstrated that different protein-matched wholefood dairy products elicit different postprandial aminoacidemic responses.
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Affiliation(s)
- Joseph Brown
- York University, 7991, School of Kinesiology and Health Science, Toronto, Ontario, Canada;
| | | | - Todd Prior
- McMaster University Department of Kinesiology, 152967, Hamilton, Ontario, Canada;
| | | | - Lauren E Skelly
- York University, 7991, School of Kinesiology and Health Science, Toronto, Ontario, Canada;
| | - Andrea R Josse
- York University, Kinesiology and Health Science, Toronto, Ontario, Canada;
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6
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Bellissimo CA, Delfinis LJ, Hughes MC, Turnbull PC, Gandhi S, DiBenedetto SN, Rahman FA, Tadi P, Amaral CA, Dehghani A, Cobley J, Quadrilatero J, Schlattner U, Perry CGR. Mitochondrial creatine sensitivity is lost in the D2.mdx model of Duchenne muscular dystrophy and rescued by the mitochondrial-enhancing compound Olesoxime. Am J Physiol Cell Physiol 2023; 324:C1141-C1157. [PMID: 36689672 DOI: 10.1152/ajpcell.00377.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Duchenne muscular dystrophy (DMD) is associated with distinct mitochondrial stress responses. Here, we aimed to determine whether the prospective mitochondrial-enhancing compound Olesoxime prevents early-stage mitochondrial stress in limb and respiratory muscle from D2.mdx mice using a proof-of-concept short-term regimen spanning 10-28 days of age. As mitochondrial-cytoplasmic energy transfer occurs via ATP- or phosphocreatine-dependent phosphate shuttling, we assessed bioenergetics with or without creatine in vitro. We observed that disruptions in Complex I-supported respiration and H2O2 emission in D2.mdx quadriceps and diaphragm were amplified by creatine demonstrating mitochondrial creatine insensitivity manifests ubiquitously and early in this model. Olesoxime selectively rescued or maintained creatine sensitivity in both muscles, independent of the abundance of respiration-related mitochondrial proteins or mitochondrial creatine kinase cysteine oxidation in quadriceps. Mitochondrial calcium retention capacity and glutathione were altered in a muscle-specific manner in D2.mdx but were generally unchanged by Olesoxime. Treatment reduced serum creatine kinase (muscle damage) and preserved cage hang-time, microCT-based volumes of lean compartments including whole body, hindlimb and bone, recovery of diaphragm force after fatigue, and cross-sectional area of diaphragm type IIX fibre, but reduced type I fibres in quadriceps. Grip strength, voluntary wheel-running and fibrosis were unaltered by Olesoxime. In summary, locomotor and respiratory muscle mitochondrial creatine sensitivities are lost during early stages in D2.mdx mice but are preserved by short-term treatment with Olesoxime in association with specific indices of muscle quality suggesting early myopathy in this model is at least partially attributed to mitochondrial stress.
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Affiliation(s)
- Catherine A Bellissimo
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Luca J Delfinis
- https://ror.org/05fq50484York University, Toronto, Ontario, Canada
| | - Meghan C Hughes
- School of Kinesiology and Health Science, https://ror.org/05fq50484York University, Toronto, Canada
| | - Patrick C Turnbull
- School of Kinesiology & Health Sciences, https://ror.org/05fq50484York University, Canada
| | - Shivam Gandhi
- School of Kinesiology &Health Sciences, Muscle Health Research Centre, https://ror.org/05fq50484York University, Toronto, Canada
| | - Sara N DiBenedetto
- School of Kinesiology & Health Sciences, Muscle Health Research Centre, https://ror.org/05fq50484York University, Canada
| | - Fasih A Rahman
- Department of Kinesiology and Health Sciences, https://ror.org/01aff2v68University of Waterloo, Canada
| | - Peyman Tadi
- School of Kinesiology & Health Sciences, https://ror.org/05fq50484York University, Canada
| | - Christina A Amaral
- School of Kinesiology & Health Sciences, https://ror.org/05fq50484York University, Canada
| | - Ali Dehghani
- School of Kinesiology & Health Science, https://ror.org/05fq50484York University, Canada
| | | | - Joe Quadrilatero
- Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada, Waterloo, Ontario
| | - Uwe Schlattner
- Fundamental and Applied Bioenergetics, University Grenoble Alpes, Inserm, U1055, Grenoble, France, Grenoble cedex 9, France
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), Faculty of Health, https://ror.org/05fq50484York University, Toronto, ON, Canada
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7
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Fuller KNZ, McCoin CS, Stierwalt H, Allen J, Gandhi S, Perry CGR, Jambal P, Shankar K, Thyfault JP. Oral combined contraceptives induce liver mitochondrial reactive oxygen species and whole-body metabolic adaptations in female mice. J Physiol 2022; 600:5215-5245. [PMID: 36326014 DOI: 10.1113/jp283733] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/17/2022] [Indexed: 11/06/2022] Open
Abstract
Compared to age-matched men, pre-menopausal women show greater resilience against cardiovascular disease (CVD), hepatic steatosis, diabetes and obesity - findings that are widely attributed to oestrogen. However, meta-analysis data suggest that current use of oral combined contraceptives (OC) is a risk factor for myocardial infarction, and OC use further compounds with metabolic disease risk factors to increase CVD susceptibility. While mitochondrial function in tissues such as the liver and skeletal muscle is an emerging mechanism by which oestrogen may confer its protection, effects of OC use on mitochondria and metabolism in the context of disease risk remain unexplored. To answer this question, female C57Bl/6J mice were fed a high fat diet and treated with vehicle or OCs for 3, 12 or 20 weeks (n = 6 to 12 per group) at a dose and ratio that mimic the human condition of cycle cessation in the low oestrogen, high progesterone stage. Liver and skeletal muscle mitochondrial function (respiratory capacity, H2 O2 , coupling) was measured along with clinical outcomes of cardiometabolic disease such as obesity, glucose tolerance, hepatic steatosis and aortic atherosclerosis. The main findings indicate that regardless of treatment duration, OCs robustly increase hepatic mitochondrial H2 O2 levels, likely due to diminished antioxidant capacity, but have no impact on muscle mitochondrial H2 O2 . Furthermore, OC-treated mice had lower adiposity and hepatic triglyceride content compared to control mice despite reduced wheel running, spontaneous physical activity and total energy expenditure. Together, these studies describe tissue-specific effects of OC use on mitochondria as well as variable impacts on markers of metabolic disease susceptibility. KEY POINTS: Oestrogen loss in women increases risk for cardiometabolic diseases, a link that has been partially attributed to negative impacts on mitochondria and energy metabolism. To study the effect of oral combined contraceptives (OCs) on hepatic and skeletal muscle mitochondria and whole-body energy metabolism, we used an animal model of OCs which mimics the human condition of cessation of hormonal cycling in the low oestrogen, high progesterone state. OC-treated mice have increased hepatic mitochondrial oxidative stress and decreased physical activity and energy expenditure, despite displaying lower adiposity and liver fat at this time point. These pre-clinical data reveal tissue-specific effects of OCs that likely underlie the clinical findings of increased cardiometabolic disease in women who use OCs compared to non-users, when matched for obesity.
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Affiliation(s)
- Kelly N Z Fuller
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, USA.,Research Service, Kansas City Veterans Affairs Medical Center, Kansas City, MO, USA
| | - Colin S McCoin
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, USA.,Research Service, Kansas City Veterans Affairs Medical Center, Kansas City, MO, USA.,Center for Children's Healthy Lifestyles and Nutrition, Kansas City, MO, USA.,University of Kansas Diabetes Institute, Kansas City, KS, USA.,Kansas Center for Metabolism and Obesity Research, Kansas City, KS, USA
| | - Harrison Stierwalt
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, USA.,Research Service, Kansas City Veterans Affairs Medical Center, Kansas City, MO, USA
| | - Julie Allen
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, USA.,Research Service, Kansas City Veterans Affairs Medical Center, Kansas City, MO, USA
| | - Shivam Gandhi
- School of Kinesiology and Health Science, Muscle Health Research Center, York University, Toronto, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Center, York University, Toronto, Canada
| | - Purevsuren Jambal
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine Anschutz Medical Campus, Aurora, CO, USA
| | - Kartik Shankar
- Department of Pediatrics, Section of Nutrition, University of Colorado School of Medicine Anschutz Medical Campus, Aurora, CO, USA
| | - John P Thyfault
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, USA.,Research Service, Kansas City Veterans Affairs Medical Center, Kansas City, MO, USA.,Center for Children's Healthy Lifestyles and Nutrition, Kansas City, MO, USA.,University of Kansas Diabetes Institute, Kansas City, KS, USA.,Kansas Center for Metabolism and Obesity Research, Kansas City, KS, USA.,Department of Internal Medicine, Division of Endocrinology and Metabolism, University of Kansas Medical Center, Kansas City, KS, USA
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Vainshtein A, Slavin MB, Cheng AJ, Memme JM, Oliveira AN, Perry CGR, Abdul-Sater AA, Belcastro AN, Riddell MC, Triolo M, Haas TL, Roudier E, Hood DA. Scientific meeting report: International Biochemistry of Exercise 2022. J Appl Physiol (1985) 2022; 133:1381-1393. [PMID: 36356257 DOI: 10.1152/japplphysiol.00475.2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Exercise is one of the only nonpharmacological remedies known to counteract genetic and chronic diseases by enhancing health and improving life span. Although the many benefits of regular physical activity have been recognized for some time, the intricate and complex signaling systems triggered at the onset of exercise have only recently begun to be uncovered. Exercising muscles initiate a coordinated, multisystemic, metabolic rewiring, which is communicated to distant organs by various molecular mediators. The field of exercise research has been expanding beyond the musculoskeletal system, with interest from industry to provide realistic models and exercise mimetics that evoke a whole body rejuvenation response. The 18th International Biochemistry of Exercise conference took place in Toronto, Canada, from May 25 to May 28, 2022, with more than 400 attendees. Here, we provide an overview of the most cutting-edge exercise-related research presented by 66 speakers, focusing on new developments in topics ranging from molecular and cellular mechanisms of exercise adaptations to exercise therapy and management of disease and aging. We also describe how the manipulation of these signaling pathways can uncover therapeutic avenues for improving human health and quality of life.
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Affiliation(s)
| | - Mikhaela B Slavin
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Arthur J Cheng
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Jonathan M Memme
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Ashley N Oliveira
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Ali A Abdul-Sater
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Angelo N Belcastro
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Michael C Riddell
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Matthew Triolo
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Tara L Haas
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - Emilie Roudier
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
| | - David A Hood
- Faculty of Health, School of Kinesiology and Health Science, Muscle Health Research Centre (MHRC), York University, Toronto, Ontario, Canada
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9
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Bellissimo CA, Garibotti MC, Perry CGR. Mitochondrial Stress Responses in Duchenne muscular dystrophy: Metabolic Dysfunction or Adaptive Reprogramming? Am J Physiol Cell Physiol 2022; 323:C718-C730. [PMID: 35816642 DOI: 10.1152/ajpcell.00249.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Mitochondrial stress may be a secondary contributor to muscle weakness in inherited muscular dystrophies. Duchenne muscular dystrophy has received the majority of attention whereby most discoveries suggest mitochondrial ATP synthesis may be reduced. However, not all studies support this finding. Furthermore, some studies have reported increased mitochondrial reactive oxygen species and propensity for permeability transition pore formation as an inducer of apoptosis, although divergent findings have also been described. A closer examination of the literature suggests the degree and direction of mitochondrial stress responses may depend on the progression of the disease, the muscle type examined, the mouse model employed with regards to pre-clinical research, the precise metabolic pathways in consideration, and in some cases the in vitro technique used to assess a given mitochondrial bioenergetic function. One intent of this review is to provide careful considerations for future experimental designs to resolve the heterogeneous nature of mitochondrial stress during the progression of Duchenne muscular dystrophy. Such considerations have implications for other muscular dystrophies as well which are addressed briefly herein. A renewed perspective of the term 'mitochondrial dysfunction' is presented whereby stress responses might be re-explored in future investigations as direct contributors to myopathy vs an adaptive 'reprogramming' intended to maintain homeostasis in the face of disease stressors themselves. In so doing, the prospective development of mitochondrial enhancement therapies can be driven by advances in perspectives as much as experimental approaches when resolving the precise relationships between mitochondrial remodelling and muscle weakness in Duchenne and, indeed, other muscular dystrophies.
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Affiliation(s)
- Catherine A Bellissimo
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Madison C Garibotti
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
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10
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Norrbom JM, Ydfors M, Lovric A, Perry CGR, Rundqvist H, Rullman E. A HIF-1 signature dominates the attenuation in the human skeletal muscle transcriptional response to high-intensity interval training. J Appl Physiol (1985) 2022; 132:1448-1459. [PMID: 35482326 DOI: 10.1152/japplphysiol.00310.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
High-intensity interval training (HIIT) generates profound metabolic adaptations in skeletal muscle. These responses mirror performance improvements but follow a non-linear pattern comprised of an initial fast phase followed by a gradual plateau effect. The complete time-dependent molecular sequelae that regulates this plateau effect remains unknown. We hypothesize that the plateau effect during HIIT is restricted to specific pathways with communal upstream transcriptional regulation. To investigate this, eleven healthy men performed nine sessions of HIIT (10x4 minutes of cycling at 91 % of HRmax) over a 3-week period. Before and 3h after the 1st and 9th exercise bout, skeletal muscle biopsies were obtained, and RNA sequencing performed. Almost 2,000 genes across 84 pathways were differentially expressed in response to a single HIIT session. The overall transcriptional response to acute exercise was strikingly similar at 3 weeks, 83 % (n=1650) of the genes regulated after the 1st bout of exercise were similarly regulated by the 9th bout, albeit with a smaller effect size, and the response attenuated to on average 70 % of the 1st bout. The attenuation differed substantially between pathways and was very pronounced for glycolysis and cellular adhesion but more preserved for MAPK and VEGF-A signalling. The attenuation was driven by a combination of changes in steady-state expression and specific transcriptional regulation. Given that the exercise intensity was progressively increased, and that the attenuation was pathway specific, we suggest that moderation of muscular adaptation after a period of training stems from targeted regulation rather than a diminished exercise stimulus.
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Affiliation(s)
| | - Mia Ydfors
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Alen Lovric
- Department of Laboratory Medicine, Clinical Physiology, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Christopher G R Perry
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Helene Rundqvist
- Department of Laboratory Medicine, Clinical Physiology, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
| | - Eric Rullman
- Department of Laboratory Medicine, Clinical Physiology, Karolinska Institutet and Karolinska University Hospital, Stockholm, Sweden
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11
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Jordan AC, Perry CGR, Cheng AJ. Promoting a pro-oxidant state in skeletal muscle: Potential dietary, environmental, and exercise interventions for enhancing endurance-training adaptations. Free Radic Biol Med 2021; 176:189-202. [PMID: 34560246 DOI: 10.1016/j.freeradbiomed.2021.09.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/06/2021] [Accepted: 09/16/2021] [Indexed: 12/17/2022]
Abstract
Accumulating evidence now shows that supplemental antioxidants including vitamin C, vitamin E and N-Acetylcysteine consumption can suppress adaptations to endurance-type exercise by attenuating reactive oxygen and nitrogen species (RONS) formation within skeletal muscle. This emerging evidence points to the importance of pro-oxidation as an important stimulus for endurance-training adaptations, including mitochondrial biogenesis, endogenous antioxidant production, insulin signalling, angiogenesis and growth factor signaling. Although sustained oxidative distress is associated with many chronic diseases, athletes have, on average, elevated levels of certain endogenous antioxidants to maintain redox homeostasis. As a result, trained athletes may have a better capacity to buffer oxidants during and after exercise, resulting in a reduced oxidative eustress stimulus for adaptations. Thus, higher levels of RONS input and exercise-induced oxidative stress may benefit athletes in the pursuit of continuous endurance training redox adaptations. This review addresses why athletes should be looking to enhance exercise-induced oxidative stress and how it can be accomplished. Methods covered include high-intensity interval training, hyperthermia and heat stress, dietary antioxidant restriction and modified antioxidant timing, dietary antioxidants and polyphenols as adjuncts to exercise, and vitamin C as a pro-oxidant.
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Affiliation(s)
- Adam C Jordan
- Muscle Health Research Centre, School of Kinesiology and Health Sciences, Faculty of Health, York University, M3J 1P3, Toronto, Canada
| | - Christopher G R Perry
- Muscle Health Research Centre, School of Kinesiology and Health Sciences, Faculty of Health, York University, M3J 1P3, Toronto, Canada
| | - Arthur J Cheng
- Muscle Health Research Centre, School of Kinesiology and Health Sciences, Faculty of Health, York University, M3J 1P3, Toronto, Canada.
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12
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Monaco CMF, Tarnopolsky MA, Dial AG, Nederveen JP, Rebalka IA, Nguyen M, Turner LV, Perry CGR, Ljubicic V, Hawke TJ. Normal to enhanced intrinsic mitochondrial respiration in skeletal muscle of middle- to older-aged women and men with uncomplicated type 1 diabetes. Diabetologia 2021; 64:2517-2533. [PMID: 34392397 DOI: 10.1007/s00125-021-05540-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 05/20/2021] [Indexed: 12/26/2022]
Abstract
AIMS/HYPOTHESIS This study interrogated mitochondrial respiratory function and content in skeletal muscle biopsies of healthy adults between 30 and 72 years old with and without uncomplicated type 1 diabetes. METHODS Participants (12 women/nine men) with type 1 diabetes (48 ± 11 years of age), without overt complications, were matched for age, sex, BMI and level of physical activity to participants without diabetes (control participants) (49 ± 12 years of age). Participants underwent a Bergström biopsy of the vastus lateralis to assess mitochondrial respiratory function using high-resolution respirometry and citrate synthase activity. Electron microscopy was used to quantify mitochondrial content and cristae (pixel) density. RESULTS Mean mitochondrial area density was 27% lower (p = 0.006) in participants with type 1 diabetes compared with control participants. This was largely due to smaller mitochondrial fragments in women with type 1 diabetes (-18%, p = 0.057), as opposed to a decrease in the total number of mitochondrial fragments in men with diabetes (-28%, p = 0.130). Mitochondrial respiratory measures, whether estimated per milligram of tissue (i.e. mass-specific) or normalised to area density (i.e. intrinsic mitochondrial function), differed between cohorts, and demonstrated sexual dimorphism. Mass-specific mitochondrial oxidative phosphorylation (OXPHOS) capacity with the substrates for complex I and complex II (CI + II) was significantly lower (-24%, p = 0.033) in women with type 1 diabetes compared with control participants, whereas mass-specific OXPHOS capacities with substrates for complex I only (pyruvate [CI pyr] or glutamate [CI glu]) or complex II only (succinate [CII succ]) were not different (p > 0.404). No statistical differences (p > 0.397) were found in mass-specific OXPHOS capacity in men with type 1 diabetes compared with control participants despite a 42% non-significant increase in CI glu OXPHOS capacity (p = 0.218). In contrast, intrinsic CI + II OXPHOS capacity was not different in women with type 1 diabetes (+5%, p = 0.378), whereas in men with type 1 diabetes it was 25% higher (p = 0.163) compared with control participants. Men with type 1 diabetes also demonstrated higher intrinsic OXPHOS capacity for CI pyr (+50%, p = 0.159), CI glu (+88%, p = 0.033) and CII succ (+28%, p = 0.123), as well as higher intrinsic respiratory rates with low (more physiological) concentrations of either ADP, pyruvate, glutamate or succinate (p < 0.012). Women with type 1 diabetes had higher (p < 0.003) intrinsic respiratory rates with low concentrations of succinate only. Calculated aerobic fitness (Physical Working Capacity Test [PWC130]) showed a strong relationship with mitochondrial respiratory function and content in the type 1 diabetes cohort. CONCLUSIONS/INTERPRETATION In middle- to older-aged adults with uncomplicated type 1 diabetes, we conclude that skeletal muscle mitochondria differentially adapt to type 1 diabetes and demonstrate sexual dimorphism. Importantly, these cellular alterations were significantly associated with our metric of aerobic fitness (PWC130) and preceded notable impairments in skeletal mass and strength.
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Affiliation(s)
- Cynthia M F Monaco
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | | | - Athan G Dial
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | | | - Irena A Rebalka
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Maria Nguyen
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Lauren V Turner
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Vladimir Ljubicic
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada.
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13
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Nederveen JP, Manta K, Bujak AL, Simone AC, Fuda MR, Nilsson MI, Hettinga BP, Hughes MC, Perry CGR, Tarnopolsky MA. A Novel Multi-Ingredient Supplement Activates a Browning Program in White Adipose Tissue and Mitigates Weight Gain in High-Fat Diet-Fed Mice. Nutrients 2021; 13:3726. [PMID: 34835983 PMCID: PMC8623014 DOI: 10.3390/nu13113726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 10/11/2021] [Accepted: 10/14/2021] [Indexed: 12/15/2022] Open
Abstract
We investigated the effects of a novel multi-ingredient supplement comprised of polyphenol antioxidants and compounds known to facilitate mitochondrial function and metabolic enhancement (ME) in a mouse model of obesity. In this study, 6-week-old male C57/BL6J mice were placed on a high-fat diet (HFD; ~60% fat) for 6 weeks, with subsequent allocation into experimentalgroups for 4 weeks: HFD control, HFD + ME10 (10 components), HFD + ME7 (7 components), HFD + ME10 + EX, HFD + EX (where '+EX' animals exercised 3 days/week), and chow-fed control. After the intervention, HFD control animals had significantly greater body weight and fat mass. Despite the continuation of HFD, animals supplemented with multi-ingredient ME or who performed exercise training showed an attenuation of fat mass and preservation of lean body mass, which was further enhanced when combined (ME+EX). ME supplementation stimulated the upregulation of white and brown adipose tissue mRNA transcripts associated with mitochondrial biogenesis, browning, fatty acid transport, and fat metabolism. In WAT depots, this was mirrored by mitochodrial oxidative phosphorylation (OXPHOS) protein expression, and increased in vivo fat oxidation measured via CLAMS. ME supplementation also decreased systemic and local inflammation markers. Herein, we demonstrated that novel multi-ingredient nutritional supplements induced significant fat loss independent of physical activity while preserving muscle mass in obese mice. Mechanistically, these MEs appear to act by inducing a browning program in white adipose tissue and decreasing other pathophysiological impairments associated with obesity, including mitochondrial respiration alterations induced by HFD.
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Affiliation(s)
- Joshua P. Nederveen
- Department of Pediatrics, Faculty of Health Sciences, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (J.P.N.); (K.M.); (A.C.S.); (M.R.F.)
| | - Katherine Manta
- Department of Pediatrics, Faculty of Health Sciences, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (J.P.N.); (K.M.); (A.C.S.); (M.R.F.)
| | - Adam L. Bujak
- Exerkine Corporation, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (A.L.B.); (M.I.N.); (B.P.H.)
| | - Alexander C. Simone
- Department of Pediatrics, Faculty of Health Sciences, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (J.P.N.); (K.M.); (A.C.S.); (M.R.F.)
| | - Matthew R. Fuda
- Department of Pediatrics, Faculty of Health Sciences, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (J.P.N.); (K.M.); (A.C.S.); (M.R.F.)
| | - Mats I. Nilsson
- Exerkine Corporation, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (A.L.B.); (M.I.N.); (B.P.H.)
| | - Bart P. Hettinga
- Exerkine Corporation, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (A.L.B.); (M.I.N.); (B.P.H.)
| | - Meghan C. Hughes
- Muscle Health Research Centre (MHRC), School of Kinesiology & Health Science, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada; (M.C.H.); (C.G.R.P.)
| | - Christopher G. R. Perry
- Muscle Health Research Centre (MHRC), School of Kinesiology & Health Science, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada; (M.C.H.); (C.G.R.P.)
| | - Mark A. Tarnopolsky
- Department of Pediatrics, Faculty of Health Sciences, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (J.P.N.); (K.M.); (A.C.S.); (M.R.F.)
- Exerkine Corporation, McMaster University Medical Centre (MUMC), 1200 Main St. W, Hamilton, ON L8N 3Z5, Canada; (A.L.B.); (M.I.N.); (B.P.H.)
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14
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Townsend LK, Weber AJ, Day EA, Shamshoum H, Shaw SJ, Perry CGR, Kemp BE, Steinberg GR, Wright DC. AMPK mediates energetic stress-induced liver GDF15. FASEB J 2021; 35:e21218. [PMID: 33337559 DOI: 10.1096/fj.202000954r] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 10/30/2020] [Accepted: 11/10/2020] [Indexed: 12/11/2022]
Abstract
Growth differentiating factor-15 (GDF15) is an emerging target for the treatment of obesity and metabolic disease partly due to its ability to suppress food intake. GDF15 expression and secretion are thought to be regulated by a cellular integrated stress response, which involves endoplasmic reticulum (ER) stress. AMPK is another cellular stress sensor, but the relationship between AMPK, ER stress, and GDF15 has not been assessed in vivo. Wildtype (WT), AMPK β1 deficient (AMPKβ1-/- ), and CHOP-/- mice were treated with three distinct AMPK activators; AICAR, which is converted to ZMP mimicking the effects of AMP on the AMPKγ isoform, R419, which indirectly activates AMPK through inhibition of mitochondrial respiration, or A769662, a direct AMPK activator which binds the AMPKβ1 isoform ADaM site causing allosteric activation. Following treatments, liver Gdf15, markers of ER-stress, AMPK activity, adenine nucleotides, circulating GDF15, and food intake were assessed. AICAR and R419 caused ER and energetic stress, increased GDF15 expression and secretion, and suppressed food intake. Direct activation of AMPK β1 containing complexes by A769662 increased hepatic Gdf15 expression, circulating GDF15, and suppressed food intake, independent of ER stress. The effects of AICAR, R419, and A769662 on GDF15 were attenuated in AMPKβ1-/- mice. AICAR and A769662 increased GDF15 to a similar extent in WT and CHOP-/- mice. Herein, we provide evidence that AMPK plays a role in mediating the induction of GDF15 under conditions of energetic stress in mouse liver in vivo.
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Affiliation(s)
- Logan K Townsend
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada.,Centre for Metabolism, Obesity and Diabetes Research and Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Alyssa J Weber
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Emily A Day
- Centre for Metabolism, Obesity and Diabetes Research and Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - Hesham Shamshoum
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Simon J Shaw
- Rigel Pharmaceuticals Inc., South San Francisco, CA, USA
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Bruce E Kemp
- Department of Medicine, St. Vincent's Institute, University of Melbourne, Melbourne, Vic, Australia.,Mary MacKillop Institute for Health Research, Australian Catholic University, Fitzroy, Victoria, Australia
| | - Gregory R Steinberg
- Centre for Metabolism, Obesity and Diabetes Research and Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, ON, Canada
| | - David C Wright
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
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15
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Dial AG, Monaco CMF, Grafham GK, Romanova N, Simpson JA, Tarnopolsky MA, Perry CGR, Kalaitzoglou E, Hawke TJ. Muscle and serum myostatin expression in type 1 diabetes. Physiol Rep 2021; 8:e14500. [PMID: 32652899 PMCID: PMC7354085 DOI: 10.14814/phy2.14500] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/02/2020] [Accepted: 06/03/2020] [Indexed: 12/17/2022] Open
Abstract
Type 1 diabetes (T1D) has been reported to negatively affect the health of skeletal muscle, though the underlying mechanisms are unknown. Myostatin, a myokine whose increased expression is associated with muscle‐wasting diseases, has not been reported in humans with T1D but has been demonstrated to be elevated in preclinical diabetes models. Thus, the purpose of this study was to determine if there is an elevated expression of myostatin in the serum and skeletal muscle of persons with T1D compared to controls. Secondarily, we aimed to explore relationships between myostatin expression and clinically important metrics (e.g., HbA1c, strength, lean mass) in women and men with (N = 31)/without T1D (N = 24) between 18 and 72 years old. Body composition, baseline strength, blood sample and vastus lateralis muscle biopsy were evaluated. Serum, but not muscle, myostatin expression was significantly elevated in those with T1D versus controls, and to a greater degree in T1D women than T1D men. Serum myostatin levels were not significantly associated with HbA1c nor disease duration. A significant correlation between serum myostatin expression and maximal voluntary contraction (MVC) and body fat mass was demonstrated in control subjects, but these correlations did not reach significance in those with T1D (MVC: R = 0.64 controls vs. R = 0.37 T1D; Body fat: R = −0.52 controls/R = −0.02 T1D). Collectively, serum myostatin was correlated with lean mass (R = 0.45), and while this trend was noted in both groups separately, neither reached statistical significance (R = 0.47 controls/R = 0.33 T1D). Overall, while those with T1D exhibited elevated serum myostatin levels (particularly females) myostatin expression was not correlated with clinically relevant metrics despite some of these relationships existing in controls (e.g., lean/fat mass). Future studies will be needed to fully understand the mechanisms underlying increased myostatin in T1D, with relationships to insulin dosing being particularly important to elucidate.
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Affiliation(s)
- Athan G Dial
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Cynthia M F Monaco
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Grace K Grafham
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Nadya Romanova
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada
| | | | | | - Evangelia Kalaitzoglou
- Barnstable Brown Diabetes Center and Department of Pediatrics, University of Kentucky, Lexington, KY, USA
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
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16
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Young LV, Morrison W, Campbell C, Moore EC, Arsenault MG, Dial AG, Ng S, Bellissimo CA, Perry CGR, Ljubicic V, Johnston AP. Loss of dystrophin expression in skeletal muscle is associated with senescence of macrophages and endothelial cells. Am J Physiol Cell Physiol 2021; 321:C94-C103. [PMID: 33979211 DOI: 10.1152/ajpcell.00397.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Cellular senescence is the irreversible arrest of normally dividing cells and is driven by cell cycle inhibitory proteins such as p16, p21, and p53. When cells enter senescence, they secrete a host of proinflammatory factors known as the senescence-associated secretory phenotype, which has deleterious effects on surrounding cells and tissues. Little is known of the role of senescence in Duchenne muscular dystrophy (DMD), the fatal X-linked neuromuscular disorder typified by chronic inflammation, extracellular matrix remodeling, and a progressive loss in muscle mass and function. Here, we demonstrate using C57-mdx (8-wk-old) and D2-mdx (4-wk-old and 8-wk-old) mice, two mouse models of DMD, that cells displaying canonical markers of senescence are found within the skeletal muscle. Eight-week-old D2-mdx mice, which display severe muscle pathology, had greater numbers of senescent cells associated with areas of inflammation, which were mostly Cdkn1a-positive macrophages, whereas in C57-mdx muscle, senescent populations were endothelial cells and macrophages localized to newly regenerated myofibers. Interestingly, this pattern was similar to cardiotoxin (CTX)-injured wild-type (WT) muscle, which experienced a transient senescent response. Dystrophic muscle demonstrated significant upregulations in senescence pathway genes [Cdkn1a (p21), Cdkn2a (p16INK4A), and Trp53 (p53)], which correlated with the quantity of senescence-associated β-galactosidase (SA-β-Gal)-positive cells. These results highlight an underexplored role for cellular senescence in murine dystrophic muscle.
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Affiliation(s)
- Laura V Young
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - William Morrison
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Craig Campbell
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Emma C Moore
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Michel G Arsenault
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Athan G Dial
- Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Sean Ng
- Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Catherine A Bellissimo
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Vladimir Ljubicic
- Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Adam P Johnston
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada.,Department of Biomedical Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
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17
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Avin KG, Hughes MC, Chen NX, Srinivasan S, O’Neill KD, Evan AP, Bacallao RL, Schulte ML, Moorthi RN, Gisch DL, Perry CGR, Moe SM, O’Connell TM. Skeletal muscle metabolic responses to physical activity are muscle type specific in a rat model of chronic kidney disease. Sci Rep 2021; 11:9788. [PMID: 33963215 PMCID: PMC8105324 DOI: 10.1038/s41598-021-89120-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 04/14/2021] [Indexed: 02/03/2023] Open
Abstract
Chronic kidney disease (CKD) leads to musculoskeletal impairments that are impacted by muscle metabolism. We tested the hypothesis that 10-weeks of voluntary wheel running can improve skeletal muscle mitochondria activity and function in a rat model of CKD. Groups included (n = 12-14/group): (1) normal littermates (NL); (2) CKD, and; (3) CKD-10 weeks of voluntary wheel running (CKD-W). At 35-weeks old the following assays were performed in the soleus and extensor digitorum longus (EDL): targeted metabolomics, mitochondrial respiration, and protein expression. Amino acid-related compounds were reduced in CKD muscle and not restored by physical activity. Mitochondrial respiration in the CKD soleus was increased compared to NL, but not impacted by physical activity. The EDL respiration was not different between NL and CKD, but increased in CKD-wheel rats compared to CKD and NL groups. Our results demonstrate that the soleus may be more susceptible to CKD-induced changes of mitochondrial complex content and respiration, while in the EDL, these alterations were in response the physiological load induced by mild physical activity. Future studies should focus on therapies to improve mitochondrial function in both types of muscle to determine if such treatments can improve the ability to adapt to physical activity in CKD.
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Affiliation(s)
- Keith G. Avin
- Division of Nephrology, Indiana University School of Medicine, 950 W. Walnut St., R2 202, Indianapolis, IN 46202 USA ,Department of Physical Therapy, Indiana University School of Health and Human Sciences, Indianapolis, IN USA ,Roudebush Veterans Affairs Medical Center, Indianapolis, IN USA
| | - Meghan C. Hughes
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON Canada
| | - Neal X. Chen
- Division of Nephrology, Indiana University School of Medicine, 950 W. Walnut St., R2 202, Indianapolis, IN 46202 USA ,Roudebush Veterans Affairs Medical Center, Indianapolis, IN USA
| | - Shruthi Srinivasan
- Division of Nephrology, Indiana University School of Medicine, 950 W. Walnut St., R2 202, Indianapolis, IN 46202 USA ,Roudebush Veterans Affairs Medical Center, Indianapolis, IN USA
| | - Kalisha D. O’Neill
- Division of Nephrology, Indiana University School of Medicine, 950 W. Walnut St., R2 202, Indianapolis, IN 46202 USA ,Roudebush Veterans Affairs Medical Center, Indianapolis, IN USA
| | - Andrew P. Evan
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN USA
| | - Robert L. Bacallao
- Division of Nephrology, Indiana University School of Medicine, 950 W. Walnut St., R2 202, Indianapolis, IN 46202 USA ,Roudebush Veterans Affairs Medical Center, Indianapolis, IN USA
| | - Michael L. Schulte
- Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN USA
| | - Ranjani N. Moorthi
- Division of Nephrology, Indiana University School of Medicine, 950 W. Walnut St., R2 202, Indianapolis, IN 46202 USA
| | - Debora L. Gisch
- Departamento de Engenharia Mecânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS Brazil
| | - Christopher G. R. Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON Canada
| | - Sharon M. Moe
- Division of Nephrology, Indiana University School of Medicine, 950 W. Walnut St., R2 202, Indianapolis, IN 46202 USA ,Roudebush Veterans Affairs Medical Center, Indianapolis, IN USA ,Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN USA
| | - Thomas M. O’Connell
- Department of Otolaryngology, Head and Neck Surgery, Indiana University School of Medicine, Indianapolis, IN USA
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18
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Bellissimo CA, Delfinis LJ, Hughes MC, Turnbull PC, Gandhi S, DiBenedetto SN, Rahman F, Tadi P, Amaral C, Dehghani A, Quadrilatero J, Schlattner U, Perry CGR. Correction: Muscle health in a mouse model of Duchenne muscular dystrophy can be partially improved by restoring mitochondrial creatine metabolism. Appl Physiol Nutr Metab 2020; 46:190. [PMID: 33356880 DOI: 10.1139/apnm-2020-1066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- C A Bellissimo
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - L J Delfinis
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - M C Hughes
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - P C Turnbull
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - S Gandhi
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - S N DiBenedetto
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - F Rahman
- Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
| | - P Tadi
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - C Amaral
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - A Dehghani
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
| | - J Quadrilatero
- Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
| | - U Schlattner
- Laboratory of Fundamental and Applied Bioenergetics, and SFR Environmental and Systems Biology, University of Grenoble Alpes, Grenoble, France
| | - C G R Perry
- School of Kinesiology & Health Science, Muscle Health Research Centre, York University, Toronto, ON M3J 1P3, Canada
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19
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Ramos SV, Hughes MC, Delfinis LJ, Bellissimo CA, Perry CGR. Mitochondrial bioenergetic dysfunction in the D2.mdx model of Duchenne muscular dystrophy is associated with microtubule disorganization in skeletal muscle. PLoS One 2020; 15:e0237138. [PMID: 33002037 PMCID: PMC7529311 DOI: 10.1371/journal.pone.0237138] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Accepted: 07/21/2020] [Indexed: 11/25/2022] Open
Abstract
In Duchenne muscular dystrophy, a lack of dystrophin leads to extensive muscle weakness and atrophy that is linked to cellular metabolic dysfunction and oxidative stress. This dystrophinopathy results in a loss of tethering between microtubules and the sarcolemma. Microtubules are also believed to regulate mitochondrial bioenergetics potentially by binding the outer mitochondrial membrane voltage dependent anion channel (VDAC) and influencing permeability to ADP/ATP cycling. The objective of this investigation was to determine if a lack of dystrophin causes microtubule disorganization concurrent with mitochondrial dysfunction in skeletal muscle, and whether this relationship is linked to altered binding of tubulin to VDAC. In extensor digitorum longus (EDL) muscle from 4-week old D2.mdx mice, microtubule disorganization was observed when probing for α-tubulin. This cytoskeletal disorder was associated with a reduced ability of ADP to stimulate respiration and attenuate H2O2 emission relative to wildtype controls. However, this was not associated with altered α-tubulin-VDAC2 interactions. These findings reveal that microtubule disorganization in dystrophin-deficient EDL is associated with impaired ADP control of mitochondrial bioenergetics, and suggests that mechanisms alternative to α-tubulin’s regulation of VDAC2 should be examined to understand how cytoskeletal disruption in the absence of dystrophin may cause metabolic dysfunctions in skeletal muscle.
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Affiliation(s)
- Sofhia V. Ramos
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Meghan C. Hughes
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Luca J. Delfinis
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Catherine A. Bellissimo
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G. R. Perry
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
- * E-mail:
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20
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Gandhi S, Perry CGR. Mapping the role of mitochondrial DRP1 in skeletal muscle health: is too much and too little a bad thing? J Physiol 2020; 598:3539-3540. [PMID: 32667049 DOI: 10.1113/jp280316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Shivam Gandhi
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, M3J 1P3, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, M3J 1P3, Canada
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21
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Monaco CMF, Hughes MC, Ramos SV, Varah NE, Lamberz C, Rahman FA, McGlory C, Tarnopolsky MA, Krause MP, Laham R, Hawke TJ, Perry CGR. Correction to: Altered mitochondrial bioenergetics and ultrastructure in the skeletal muscle of young adults with type 1 diabetes. Diabetologia 2020; 63:887-888. [PMID: 31993715 DOI: 10.1007/s00125-020-05092-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
In Fig. 1e the rate of mitochondrial H2O2 emission was incorrectly shown as being per second rather than per minute.
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Affiliation(s)
- Cynthia M F Monaco
- Department of Pathology and Molecular Medicine, McMaster University, 4N65 Health Sciences Centre, 1200 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | - Meghan C Hughes
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Sofhia V Ramos
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Nina E Varah
- Department of Pathology and Molecular Medicine, McMaster University, 4N65 Health Sciences Centre, 1200 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | | | - Fasih A Rahman
- Department of Kinesiology, University of Windsor, Windsor, ON, Canada
| | - Chris McGlory
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | | | - Matthew P Krause
- Department of Kinesiology, University of Windsor, Windsor, ON, Canada
| | - Robert Laham
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, 4N65 Health Sciences Centre, 1200 Main Street West, Hamilton, ON, L8N 3Z5, Canada.
| | - Christopher G R Perry
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
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22
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Monaco CMF, Perry CGR, Hawke TJ. Alterations in mitochondrial functions and morphology in muscle and non-muscle tissues in type 1 diabetes: implications for metabolic health. Exp Physiol 2020; 105:565-570. [PMID: 31826331 DOI: 10.1113/ep088096] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 12/09/2019] [Indexed: 01/20/2023]
Abstract
NEW FINDING What is the topic of this review? Evidence of impaired mitochondrial functions and/or morphology in people with type 1 diabetes across various organ systems. What advances does it highlight? Impairments to mitochondrial functions and morphology may be a primary mechanism underlying the pathophysiology of various complications in people with type 1 diabetes. ABSTRACT We recently made the observation that there are significant alterations to the ultrastructure and functions of mitochondria in skeletal muscle of people with type 1 diabetes (T1D). These alterations are proposed to lead to decreased energy production in skeletal muscle during exercise and thus may contribute to the impaired aerobic exercise capacity reported in some people with T1D. This Symposium Review summarizes the evidence that similar alterations also occur in the mitochondria present in organ systems outside skeletal muscle in people with T1D, and that this may contribute to the development and progression of the known complications of T1D, which eventually lead to the reported premature mortality.
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Affiliation(s)
- Cynthia M F Monaco
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada
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23
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Monaco CMF, Bellissimo CA, Hughes MC, Ramos SV, Laham R, Perry CGR, Hawke TJ. Sexual dimorphism in human skeletal muscle mitochondrial bioenergetics in response to type 1 diabetes. Am J Physiol Endocrinol Metab 2020; 318:E44-E51. [PMID: 31794260 PMCID: PMC6985789 DOI: 10.1152/ajpendo.00411.2019] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Sexual dimorphism in mitochondrial respiratory function has been reported in young women and men without diabetes, which may have important implications for exercise. The purpose of this study was to determine if sexual dimorphism exists in skeletal muscle mitochondrial bioenergetics in people with type 1 diabetes (T1D). A resting muscle microbiopsy was obtained from women and men with T1D (n = 10/8, respectively) and without T1D (control; n = 8/7, respectively). High-resolution respirometry and spectrofluorometry were used to measure mitochondrial respiratory function, hydrogen peroxide (mH2O2) emission and calcium retention capacity (mCRC) in permeabilized myofiber bundles. The impact of T1D on mitochondrial bioenergetics between sexes was interrogated by comparing the change between women and men with T1D relative to the average values of their respective sex-matched controls (i.e., delta). These aforementioned analyses revealed that men with T1D have increased skeletal muscle mitochondrial complex I sensitivity but reduced complex II sensitivity and capacity in comparison to women with T1D. mH2O2 emission was lower in women compared with men with T1D at the level of complex I (succinate driven), whereas mCRC and mitochondrial protein content remained similar between sexes. In conclusion, women and men with T1D exhibit differential responses in skeletal muscle mitochondrial bioenergetics. Although larger cohort studies are certainly required, these early findings nonetheless highlight the importance of considering sex as a variable in the care and treatment of people with T1D (e.g., benefits of different exercise prescriptions).
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Affiliation(s)
- Cynthia M F Monaco
- Department of Pathology and Molecular Medicine, McMaster University, Health Sciences Centre, Hamilton, Ontario, Canada
| | - Catherine A Bellissimo
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Meghan C Hughes
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Sofhia V Ramos
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Robert Laham
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, Health Sciences Centre, Hamilton, Ontario, Canada
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24
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Turnbull PC, Dehghani AC, Theriau CF, Connor MK, Perry CGR. Synergistic activation of mitochondrial metabolism and the glutathione redox couple protects HepG2 hepatocarcinoma cells from palmitoylcarnitine-induced stress. Am J Physiol Cell Physiol 2019; 317:C1324-C1329. [PMID: 31618075 DOI: 10.1152/ajpcell.00366.2019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Fatty acid stress can have divergent effects in various cancers. We explored how metabolic and redox flexibility in HepG2 hepatocarcinoma cells mediates protection from palmitoylcarnitine. HepG2 cells, along with HCT 116 and HT29 colorectal cancer cells were incubated with 100 μM palmitoylcarnitine for up to 48 h. Mitochondrial H2O2 emission, glutathione, and cell survival were assessed in HT29 and HepG2 cells. 100 μM palmitoylcarnitine promoted early growth in HepG2 cells by ~8% after 48 h versus decreased cell survival observed in HT29 and HCT 116 cells. Palmitoylcarnitine increased mitochondrial respiration at physiological and maximal concentrations of ADP, while lowering cellular lactate content in HepG2 cells, suggesting a switch to mitochondrial metabolism. HepG2 cell growth was associated with an early increase in H2O2 emission by 10 min, followed by a decrease in H2O2 at 24 h that corresponded with increased glutathione content, suggesting a redox-based compensatory mechanism. In contrast, abrogation of HT29 cell proliferation was related to decreased mitochondrial respiration (likely due to cell death) and decreased glutathione. Concurrent glutathione depletion with BSO prevented palmitoylcarnitine-induced growth in HepG2 cells, indicating that glutathione was critical for promoting growth following palmitoylcarnitine. Inhibiting UCP2 with genipin sensitized HepG2 cells to palmitoylcarnitine, suggesting that activation of UCP2 may be a 2nd redox-based mechanism conferring protection. These findings suggest that HepG2 cells possess inherent metabolic and redox flexibility relative to HT29 cells that confers protection from palmitoylcarnitine-induced stress via adaptive increases in mitochondrial respiratory control, glutathione buffering, and induction of UCP2.
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Affiliation(s)
- Patrick C Turnbull
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Ali C Dehghani
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher F Theriau
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Michael K Connor
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
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25
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Turnbull PC, Hughes MC, Perry CGR. The fatty acid derivative palmitoylcarnitine abrogates colorectal cancer cell survival by depleting glutathione. Am J Physiol Cell Physiol 2019; 317:C1278-C1288. [PMID: 31483701 DOI: 10.1152/ajpcell.00319.2019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Previous evidence suggests that palmitoylcarnitine incubations trigger mitochondrial-mediated apoptosis in HT29 colorectal adenocarcinoma cells, yet nontransformed cells appear insensitive. The mechanism by which palmitoylcarnitine induces cancer cell death is unclear. The purpose of this investigation was to examine the relationship between mitochondrial kinetics and glutathione buffering in determining the effect of palmitoylcarnitine on cell survival. HT29 and HCT 116 colorectal adenocarcinoma cells, CCD 841 nontransformed colon cells, and MCF7 breast adenocarcinoma cells were exposed to 0 μM, 50 μM, and 100 μM palmitoylcarnitine for 24-48 h. HCT 116 and HT29 cells showed decreased cell survival following palmitoylcarnitine compared with CCD 841 cells. Palmitoylcarnitine stimulated H2O2 emission in HT29 and CCD 841 cells but increased it to a greater level in HT29 cells due largely to a higher basal H2O2 emission. This greater H2O2 emission was associated with lower glutathione buffering capacity and caspase-3 activation in HT29 cells. The glutathione-depleting agent buthionine sulfoximine sensitized CCD 841 cells and further sensitized HT29 cells to palmitoylcarnitine-induced decreases in cell survival. MCF7 cells did not produce H2O2 when exposed to palmitoylcarnitine and were able to maintain glutathione levels. Furthermore, HT29 cells demonstrated the lowest mitochondrial oxidative kinetics vs. CCD 841 and MCF7 cells. The results demonstrate that colorectal cancer is sensitive to palmitoylcarnitine due in part to an inability to prevent oxidative stress through glutathione-redox coupling, thereby rendering the cells sensitive to elevations in H2O2. These findings suggest that the relationship between inherent metabolic capacities and redox regulation is altered early in response to palmitoylcarnitine.
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Affiliation(s)
- Patrick C Turnbull
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Meghan C Hughes
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada
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26
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Turnbull PC, Dehghani AC, Perry CGR. Fatty Acid‐Induced Hepatocellular Carcinoma Growth is Mediated by Decreasing Mitochondrial H
2
O
2
Emission Coupled to Increased Glutathione Levels. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.652.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Ali C. Dehghani
- School of Kinesiology and Health ScienceYork UniversityTorontoONCanada
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27
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Hughes MC, Ramos SV, Turnbull PC, Perry CGR. Advanced Stages of Duchenne Muscular Dystrophy Exhibit Mitochondrial Bioenergetic Impairments Linked Specifically to Creatine‐Dependent Energy Exchange. FASEB J 2019. [DOI: 10.1096/fasebj.2019.33.1_supplement.868.14] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Meghan C Hughes
- School of Kinesiology and Health Science and the Muscle Health Research CentreYork UniversityTorontoONCanada
| | - Sofhia V Ramos
- School of Kinesiology and Health Science and the Muscle Health Research CentreYork UniversityTorontoONCanada
| | - Patrick C Turnbull
- School of Kinesiology and Health Science and the Muscle Health Research CentreYork UniversityTorontoONCanada
| | - Christopher G R Perry
- School of Kinesiology and Health Science and the Muscle Health Research CentreYork UniversityTorontoONCanada
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28
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Perry CGR, Hawke TJ. From matrices to mitochondria: emerging roles and regulation of the striated muscle cytoskeleton. Am J Physiol Cell Physiol 2019; 316:C655-C656. [PMID: 30840491 DOI: 10.1152/ajpcell.00071.2019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Christopher G R Perry
- School of Kinesiology and Health Science, York University , Toronto, Ontario , Canada.,Muscle Health Research Center, York University , Toronto, Ontario , Canada
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University , Hamilton, Ontario , Canada.,Muscle Health Research Center, York University , Toronto, Ontario , Canada
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29
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Hughes MC, Ramos SV, Turnbull PC, Edgett BA, Huber JS, Polidovitch N, Schlattner U, Backx PH, Simpson JA, Perry CGR. Impairments in left ventricular mitochondrial bioenergetics precede overt cardiac dysfunction and remodelling in Duchenne muscular dystrophy. J Physiol 2019; 598:1377-1392. [PMID: 30674086 DOI: 10.1113/jp277306] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Accepted: 01/22/2019] [Indexed: 12/21/2022] Open
Abstract
KEY POINTS Ninety-eight per cent of patients with Duchenne muscular dystrophy (DMD) develop cardiomyopathy, with 40% developing heart failure. While increased propensity for mitochondrial induction of cell death has been observed in left ventricle, it remains unknown whether this is linked to impaired mitochondrial respiratory control and elevated H2 O2 emission prior to the onset of cardiomyopathy. Classic mouse models of DMD demonstrate hyper-regeneration in skeletal muscle which may mask mitochondrial abnormalities. Using a model with less regenerative capacity that is more akin to DMD patients, we observed elevated left ventricular mitochondrial H2 O2 and impaired oxidative phosphorylation in the absence of cardiac remodelling or overt cardiac dysfunction at 4 weeks. These impairments were associated with dysfunctions at complex I, governance by ADP and creatine-dependent phosphate shuttling, which results in a less efficient response to energy demands. Mitochondria may be a therapeutic target for the treatment of cardiomyopathy in DMD. ABSTRACT In Duchenne muscular dystrophy (DMD), mitochondrial dysfunction is predicted as a response to numerous cellular stressors, yet the contribution of mitochondria to the onset of cardiomyopathy remains unknown. To resolve this uncertainty, we designed in vitro assessments of mitochondrial bioenergetics to model mitochondrial control parameters that influence cardiac function. Both left ventricular mitochondrial responsiveness to the central bioenergetic controller ADP and the ability of creatine to facilitate mitochondrial-cytoplasmic phosphate shuttling were assessed. These measurements were performed in D2.B10-DMDmdx /2J mice - a model that demonstrates skeletal muscle atrophy and weakness due to limited regenerative capacities and cardiomyopathy more akin to people with DMD than classic models. At 4 weeks of age, there was no evidence of cardiac remodelling or cardiac dysfunction despite impairments in ADP-stimulated respiration and ADP attenuation of H2 O2 emission. These impairments were seen at both submaximal and maximal ADP concentrations despite no reductions in mitochondrial content markers. The ability of creatine to enhance ADP's control of mitochondrial bioenergetics was also impaired, suggesting an impairment in mitochondrial creatine kinase-dependent phosphate shuttling. Susceptibly to permeability transition pore opening and the subsequent activation of cell death pathways remained unchanged. Mitochondrial H2 O2 emission was elevated despite no change in markers of irreversible oxidative damage, suggesting alternative redox signalling mechanisms should be explored. These findings demonstrate that selective mitochondrial dysfunction precedes the onset of overt cardiomyopathy in D2.mdx mice, suggesting that improving mitochondrial bioenergetics by restoring ADP, creatine-dependent phosphate shuttling and complex I should be considered for treating DMD patients.
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Affiliation(s)
- Meghan C Hughes
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Sofhia V Ramos
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Patrick C Turnbull
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Brittany A Edgett
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph, Guelph, ON, Canada.,Department of Pharmacology, Dalhousie Medicine New Brunswick, Saint John, New Brunswick, Canada.,IMPART Team Canada Investigator Network, Saint John, New Brunswick, Canada
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph, Guelph, ON, Canada
| | - Nazari Polidovitch
- Department of Biology and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Uwe Schlattner
- Laboratory of Fundamental and Applied Bioenergetics (LBFA) and SFR Environmental and Systems Biology (BEeSy), University Grenoble Alpes, Grenoble, France
| | - Peter H Backx
- Department of Biology and the Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences and Cardiovascular Research Group, University of Guelph, Guelph, ON, Canada.,IMPART Team Canada Investigator Network, Saint John, New Brunswick, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, ON, Canada
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30
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Ramos SV, Hughes MC, Perry CGR. Altered skeletal muscle microtubule-mitochondrial VDAC2 binding is related to bioenergetic impairments after paclitaxel but not vinblastine chemotherapies. Am J Physiol Cell Physiol 2019; 316:C449-C455. [PMID: 30624982 DOI: 10.1152/ajpcell.00384.2018] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Microtubule-targeting chemotherapies are linked to impaired cellular metabolism, which may contribute to skeletal muscle dysfunction. However, the mechanisms by which metabolic homeostasis is perturbed remains unknown. Tubulin, the fundamental unit of microtubules, has been implicated in the regulation of mitochondrial-cytosolic ADP/ATP exchange through its interaction with the outer membrane voltage-dependent anion channel (VDAC). Based on this model, we predicted that disrupting microtubule architecture with the stabilizer paclitaxel and destabilizer vinblastine would impair skeletal muscle mitochondrial bioenergetics. Here, we provide in vitro evidence of a direct interaction between both α-tubulin and βII-tubulin with VDAC2 in untreated single extensor digitorum longus (EDL) fibers. Paclitaxel increased both α- and βII-tubulin-VDAC2 interactions, whereas vinblastine had no effect. Utilizing a permeabilized muscle fiber bundle preparation that retains the cytoskeleton, paclitaxel treatment impaired the ability of ADP to attenuate H2O2 emission, resulting in greater H2O2 emission kinetics. Despite no effect on tubulin-VDAC2 binding, vinblastine still altered mitochondrial bioenergetics through a surprising increase in ADP-stimulated respiration while also impairing ADP suppression of H2O2 and increasing mitochondrial susceptibility to calcium-induced formation of the proapoptotic permeability transition pore. Collectively, these results demonstrate that altering microtubule architecture with chemotherapeutics disrupts mitochondrial bioenergetics in EDL skeletal muscle. Specifically, microtubule stabilization increases H2O2 emission by impairing ADP sensitivity in association with greater tubulin-VDAC binding. In contrast, decreasing microtubule abundance triggers a broad impairment of ADP's governance of respiration and H2O2 emission as well as calcium retention capacity, albeit through an unknown mechanism.
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Affiliation(s)
- Sofhia V Ramos
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University , Toronto, Ontario , Canada
| | - Meghan C Hughes
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University , Toronto, Ontario , Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University , Toronto, Ontario , Canada
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31
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Bellissimo CA, Perry CGR. Sex differences in the regulation of hepatic mitochondrial turnover following physical activity: do males need more quality control than females? J Physiol 2018; 596:6125-6126. [PMID: 30284737 DOI: 10.1113/jp276896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Affiliation(s)
- Catherine A Bellissimo
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada, M3J 1P3
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada, M3J 1P3
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32
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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: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [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.
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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
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33
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Monaco CMF, Hughes MC, Ramos SV, Varah NE, Lamberz C, Rahman FA, McGlory C, Tarnopolsky MA, Krause MP, Laham R, Hawke TJ, Perry CGR. Altered mitochondrial bioenergetics and ultrastructure in the skeletal muscle of young adults with type 1 diabetes. Diabetologia 2018; 61:1411-1423. [PMID: 29666899 DOI: 10.1007/s00125-018-4602-6] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 02/28/2018] [Indexed: 02/06/2023]
Abstract
AIMS/HYPOTHESIS A comprehensive assessment of skeletal muscle ultrastructure and mitochondrial bioenergetics has not been undertaken in individuals with type 1 diabetes. This study aimed to systematically assess skeletal muscle mitochondrial phenotype in young adults with type 1 diabetes. METHODS Physically active, young adults (men and women) with type 1 diabetes (HbA1c 63.0 ± 16.0 mmol/mol [7.9% ± 1.5%]) and without type 1 diabetes (control), matched for sex, age, BMI and level of physical activity, were recruited (n = 12/group) to undergo vastus lateralis muscle microbiopsies. Mitochondrial respiration (high-resolution respirometry), site-specific mitochondrial H2O2 emission and Ca2+ retention capacity (CRC) (spectrofluorometry) were assessed using permeabilised myofibre bundles. Electron microscopy and tomography were used to quantify mitochondrial content and investigate muscle ultrastructure. Skeletal muscle microvasculature was assessed by immunofluorescence. RESULTS Mitochondrial oxidative capacity was significantly lower in participants with type 1 diabetes vs the control group, specifically at Complex II of the electron transport chain, without differences in mitochondrial content between groups. Muscles of those with type 1 diabetes also exhibited increased mitochondrial H2O2 emission at Complex III and decreased CRC relative to control individuals. Electron tomography revealed an increase in the size and number of autophagic remnants in the muscles of participants with type 1 diabetes. Despite this, levels of the autophagic regulatory protein, phosphorylated AMP-activated protein kinase (p-AMPKαThr172), and its downstream targets, phosphorylated Unc-51 like autophagy activating kinase 1 (p-ULK1Ser555) and p62, was similar between groups. In addition, no differences in muscle capillary density or platelet aggregation were observed between the groups. CONCLUSIONS/INTERPRETATION Alterations in mitochondrial ultrastructure and bioenergetics are evident within the skeletal muscle of active young adults with type 1 diabetes. It is yet to be elucidated whether more rigorous exercise may help to prevent skeletal muscle metabolic deficiencies in both active and inactive individuals with type 1 diabetes.
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Affiliation(s)
- Cynthia M F Monaco
- Department of Pathology and Molecular Medicine, McMaster University, 4N65 Health Sciences Centre, 1200 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | - Meghan C Hughes
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Sofhia V Ramos
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Nina E Varah
- Department of Pathology and Molecular Medicine, McMaster University, 4N65 Health Sciences Centre, 1200 Main Street West, Hamilton, ON, L8N 3Z5, Canada
| | | | - Fasih A Rahman
- Department of Kinesiology, University of Windsor, Windsor, ON, Canada
| | - Chris McGlory
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | | | - Matthew P Krause
- Department of Kinesiology, University of Windsor, Windsor, ON, Canada
| | - Robert Laham
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Thomas J Hawke
- Department of Pathology and Molecular Medicine, McMaster University, 4N65 Health Sciences Centre, 1200 Main Street West, Hamilton, ON, L8N 3Z5, Canada.
| | - Christopher G R Perry
- School of Kinesiology and Health Sciences, Muscle Health Research Centre, York University, Toronto, ON, Canada
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Mandel ER, Dunford EC, Abdifarkosh G, Turnbull PC, Perry CGR, Riddell MC, Haas TL. The superoxide dismutase mimetic tempol does not alleviate glucocorticoid-mediated rarefaction of rat skeletal muscle capillaries. Physiol Rep 2018; 5:e13243. [PMID: 28533261 PMCID: PMC5449555 DOI: 10.14814/phy2.13243] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/13/2017] [Accepted: 03/16/2017] [Indexed: 12/17/2022] Open
Abstract
Sustained elevations in circulating glucocorticoids elicit reductions in skeletal muscle microvascular content, but little is known of the underlying mechanisms. We hypothesized that glucocorticoid‐induced oxidative stress contributes to this phenomenon. In rats that were implanted with corticosterone (CORT) or control pellets, CORT caused a significant decrease in muscle glutathione levels and a corresponding increase in protein carbonylation, an irreversible oxidative modification of proteins. Decreased endothelial nitric oxide synthase and increased endothelin‐1 mRNA levels were detected after 9 days of CORT, and blood flow to glycolytic muscles was diminished. Control and CORT rats were treated concurrently with drinking water containing the superoxide dismutase mimetic tempol (172 mg/L) or the α‐1 adrenergic receptor antagonist prazosin (50 mg/L) for 6 or 16 days. Both tempol and prazosin alleviated skeletal muscle protein carbonylation. Tempol failed to prevent CORT‐mediated capillary rarefaction and was ineffective in restoring skeletal muscle blood flow. In contrast, prazosin blocked capillary rarefaction and restored skeletal muscle blood flow to control levels. The failure of tempol to prevent CORT‐induced skeletal muscle microvascular rarefaction does not support a dominant role of superoxide‐induced oxidative stress in this process. Although a decrease in protein carbonylation was observed with prazosin treatment, our data suggest that the maintenance of skeletal muscle microvascular content is related more closely with counteracting the CORT‐mediated influence on skeletal muscle vascular tone.
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Affiliation(s)
- Erin R Mandel
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Emily C Dunford
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Ghoncheh Abdifarkosh
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Patrick C Turnbull
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Michael C Riddell
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Tara L Haas
- School of Kinesiology and Health Science and the Muscle Health Research Centre, York University, Toronto, Ontario, Canada
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35
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Edgett BA, Hughes MC, Matusiak JBL, Perry CGR, Simpson CA, Gurd BJ. SIRT3 gene expression but not SIRT3 subcellular localization is altered in response to fasting and exercise in human skeletal muscle. Exp Physiol 2018; 101:1101-13. [PMID: 27337034 DOI: 10.1113/ep085744] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 05/25/2016] [Indexed: 12/30/2022]
Abstract
NEW FINDINGS What is the central question of this study? Evidence from cellular and animal models suggests that SIRT3 is involved in regulating aerobic ATP production. Thus, we investigated whether changes in fatty acid and oxidative metabolism known to accompany fasting and exercise occur in association with changes in SIRT3 mitochondrial localization and expression in human skeletal muscle. What is the main finding and its importance? We find that 48 h of fasting and acute endurance exercise decrease SIRT3 mRNA expression but do not alter SIRT3 mitochondrial localization despite marked increases in fatty acid oxidation. This suggests that SIRT3 activity is not regulated by changes in mitochondrial localization in response to cellular energy stress in human skeletal muscle. The present study examined SIRT3 expression and SIRT3 mitochondrial localization in response to acute exercise and short-term fasting in human skeletal muscle. Experiment 1 involved eight healthy men (age, 21.4 ± 2.8 years; peak O2 uptake, 47.1 ± 11.8 ml min(-1) kg(-1) ) who performed a single bout of exercise at ∼55% of peak aerobic work rate for 1 h. Muscle biopsies were obtained at rest (Rest), immediately after exercise (EX-0) and 3 h postexercise (EX-3). Experiment 2 involved 10 healthy men (age, 22.0 ± 1.5 years; peak O2 uptake, 46.9 ± 6.0 ml min−1 kg−1) who underwent a 48 h fast, with muscle biopsies collected 1 h postprandial (Fed) and after 48 h of fasting (Fast). Mitochondrial respiration was measured using high-resolution respirometry in permeabilized muscle fibre bundles to assess substrate oxidation. Whole body fat oxidation increased after both exercise (Rest, 0.96 ± 0.32 kcal min(-1) ; Exercise, 5.66 ± 1.97 kcal min(-1) ; P < 0.001) and fasting (Fed, 0.87 ± 0.51 kcal min(-1) ; Fast, 1.30 ± 0.37 kcal min(-1) , P < 0.05). SIRT3 gene expression decreased (P < 0.05) after both exercise (-8%) and fasting (-19%); however, SIRT3 whole muscle protein content was unaltered after fasting. No changes were observed in SIRT3 mitochondrial localization following either exercise or fasting. Fasting also decreased the Vmax of glutamate [80 ± 43 versus 50 ± 21 pmol s(-1) (mg dry weight)(-1) ; P < 0.05]. These findings suggest that SIRT3 does not appear to be regulated by changes in mitochondrial localization at the time points measured in the present study in response to cellular energy stress in human skeletal muscle.
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Affiliation(s)
- Brittany A Edgett
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada, K7L 3N6
| | - Meghan C Hughes
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada, M3J 1P3
| | - Jennifer B L Matusiak
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada, K7L 3N6
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, Ontario, Canada, M3J 1P3
| | - Craig A Simpson
- Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada, K7L 3N6
| | - Brendon J Gurd
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada, K7L 3N6
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36
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Bhattacharya D, Ydfors M, Hughes MC, Norrbom J, Perry CGR, Scimè A. Decreased transcriptional corepressor p107 is associated with exercise-induced mitochondrial biogenesis in human skeletal muscle. Physiol Rep 2017; 5:5/5/e13155. [PMID: 28270591 PMCID: PMC5350169 DOI: 10.14814/phy2.13155] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 01/10/2017] [Accepted: 01/13/2017] [Indexed: 11/24/2022] Open
Abstract
Increased mitochondrial content is a hallmark of exercise-induced skeletal muscle remodeling. For this process, considerable evidence underscores the involvement of transcriptional coactivators in mediating mitochondrial biogenesis. However, our knowledge regarding the role of transcriptional corepressors is lacking. In this study, we assessed the association of the transcriptional corepressor Rb family proteins, Rb and p107, with endurance exercise-induced mitochondrial adaptation in human skeletal muscle. We showed that p107, but not Rb, protein levels decrease by 3 weeks of high-intensity interval training. This is associated with significant inverse association between p107 and exercise-induced improved mitochondrial oxidative phosphorylation. Indeed, p107 showed significant reciprocal correlations with the protein contents of representative markers of mitochondrial electron transport chain complexes. These findings in human skeletal muscle suggest that attenuated transcriptional repression through p107 may be a novel mechanism by which exercise stimulates mitochondrial biogenesis following exercise.
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Affiliation(s)
- Debasmita Bhattacharya
- Stem Cell Research Group, Molecular, Cellular and Integrative Physiology, Faculty of Health York University, Toronto, Canada.,Molecular, Cellular and Integrative Physiology, Faculty of Health York University, Toronto, Canada
| | - Mia Ydfors
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Meghan C Hughes
- Molecular, Cellular and Integrative Physiology, Faculty of Health York University, Toronto, Canada
| | - Jessica Norrbom
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Christopher G R Perry
- Molecular, Cellular and Integrative Physiology, Faculty of Health York University, Toronto, Canada
| | - Anthony Scimè
- Stem Cell Research Group, Molecular, Cellular and Integrative Physiology, Faculty of Health York University, Toronto, Canada .,Molecular, Cellular and Integrative Physiology, Faculty of Health York University, Toronto, Canada
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37
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Pinho RA, Sepa-Kishi DM, Bikopoulos G, Wu MV, Uthayakumar A, Mohasses A, Hughes MC, Perry CGR, Ceddia RB. High-fat diet induces skeletal muscle oxidative stress in a fiber type-dependent manner in rats. Free Radic Biol Med 2017; 110:381-389. [PMID: 28690197 DOI: 10.1016/j.freeradbiomed.2017.07.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 05/15/2017] [Accepted: 07/05/2017] [Indexed: 02/02/2023]
Abstract
This study investigated the effects of high-fat (HF) diet on parameters of oxidative stress among muscles with distinct fiber type composition and oxidative capacities. To accomplish that, male Wistar rats were fed either a low-fat standard chow (SC) or a HF diet for 8 weeks. Soleus, extensor digitorum longus (EDL), and epitrochlearis muscles were collected and mitochondrial H2O2 (mtH2O2) emission, palmitate oxidation, and gene expression and antioxidant system were measured. Chronic HF feeding enhanced fat oxidation in oxidative and glycolytic muscles. It also caused a significant reduction in mtH2O2 emission in the EDL muscle, although a tendency towards a reduction was also found in the soleus and epitrochlearis muscles. In the epitrochlearis, HF diet increased mRNA expression of the NADPH oxidase complex; however, this muscle also showed an increase in the expression of antioxidant proteins, suggesting a higher capacity to generate and buffer ROS. The soleus muscle, despite being highly oxidative, elicited H2O2 emission rates equivalent to only 20% and 35% of the values obtained for EDL and epitrochlearis muscles, respectively. Furthermore, the Epi muscle with the lowest oxidative capacity was the second highest in H2O2 emission. In conclusion, it appears that intrinsic differences related to the distribution of type I and type II fibers, rather than oxidative capacity, drove the activity of the anti- and pro-oxidant systems and determine ROS production in different skeletal muscles. This also suggests that the impact of potentially deleterious effects of ROS production on skeletal muscle metabolism/function under lipotoxic conditions is fiber type-specific.
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Affiliation(s)
- Ricardo A Pinho
- Laboratory of Exercise Biochemistry and Physiology, Graduate Program in Health Sciences, Health Sciences Unit, Universidade do Extremo Sul Catarinense, Criciúma (UNESC), Santa Catarina, Brazil.
| | - Diane M Sepa-Kishi
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - George Bikopoulos
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Michelle V Wu
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Abinas Uthayakumar
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Arta Mohasses
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Meghan C Hughes
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
| | - Rolando B Ceddia
- School of Kinesiology and Health Science - Muscle Health Research Centre, York University, Toronto, Ontario, Canada
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38
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Porras DP, Abbaszadeh M, Bhattacharya D, D'Souza NC, Edjiu NR, Perry CGR, Scimè A. p107 Determines a Metabolic Checkpoint Required for Adipocyte Lineage Fates. Stem Cells 2017; 35:1378-1391. [PMID: 28233396 DOI: 10.1002/stem.2576] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 01/07/2017] [Indexed: 12/14/2022]
Abstract
We show that the transcriptional corepressor p107 orchestrates a metabolic checkpoint that determines adipocyte lineage fates for non-committed progenitors. p107 accomplishes this when stem cell commitment would normally occur in growth arrested cells. p107-deficient embryonic progenitors are characterized by a metabolic state resembling aerobic glycolysis that is necessary for their pro-thermogenic fate. Indeed, during growth arrest they have a reduced capacity for NADH partitioning between the cytoplasm and mitochondria. Intriguingly, this occurred despite an increase in the capacity for mitochondrial oxidation of non-glucose substrates. The significance of metabolic reprogramming is underscored by the disruption of glycolytic capacities in p107-depleted progenitors that reverted their fates from pro-thermogenic to white adipocytes. Moreover, the manipulation of glycolytic capacity on nonspecified embryonic and adult progenitors forced their beige fat commitment. These innovative findings introduce a new approach to increase pro-thermogenic adipocytes based on simply promoting aerobic glycolysis to manipulate nonspecified progenitor fate decisions. Stem Cells 2017;35:1378-1391.
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Affiliation(s)
- Deanna P Porras
- Stem Cell Research Group, York University, Toronto, Ontario, Canada.,Molecular, Cellular and Integrative Physiology, Faculty of Health, York University, Toronto, Ontario, Canada
| | - Maryam Abbaszadeh
- Stem Cell Research Group, York University, Toronto, Ontario, Canada.,Molecular, Cellular and Integrative Physiology, Faculty of Health, York University, Toronto, Ontario, Canada
| | - Debasmita Bhattacharya
- Stem Cell Research Group, York University, Toronto, Ontario, Canada.,Molecular, Cellular and Integrative Physiology, Faculty of Health, York University, Toronto, Ontario, Canada
| | - Ninoschka C D'Souza
- Stem Cell Research Group, York University, Toronto, Ontario, Canada.,Molecular, Cellular and Integrative Physiology, Faculty of Health, York University, Toronto, Ontario, Canada
| | - Nareh R Edjiu
- Stem Cell Research Group, York University, Toronto, Ontario, Canada.,Molecular, Cellular and Integrative Physiology, Faculty of Health, York University, Toronto, Ontario, Canada
| | - Christopher G R Perry
- Molecular, Cellular and Integrative Physiology, Faculty of Health, York University, Toronto, Ontario, Canada
| | - Anthony Scimè
- Stem Cell Research Group, York University, Toronto, Ontario, Canada.,Molecular, Cellular and Integrative Physiology, Faculty of Health, York University, Toronto, Ontario, Canada
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Perry CGR. Mitochondrial adaptations to exercise in human skeletal muscle: a possible role for cristae density as a determinant of muscle fitness. J Physiol 2017; 595:2773-2774. [PMID: 28078668 DOI: 10.1113/jp273549] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada, M3J 1P3
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40
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Smith BK, Ford RJ, Desjardins EM, Green AE, Hughes MC, Houde VP, Day EA, Marcinko K, Crane JD, Mottillo EP, Perry CGR, Kemp BE, Tarnopolsky MA, Steinberg GR. Salsalate (Salicylate) Uncouples Mitochondria, Improves Glucose Homeostasis, and Reduces Liver Lipids Independent of AMPK-β1. Diabetes 2016; 65:3352-3361. [PMID: 27554471 PMCID: PMC5233442 DOI: 10.2337/db16-0564] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Accepted: 08/16/2016] [Indexed: 12/17/2022]
Abstract
Salsalate is a prodrug of salicylate that lowers blood glucose in patients with type 2 diabetes (T2D) and reduces nonalcoholic fatty liver disease (NAFLD) in animal models; however, the mechanism mediating these effects is unclear. Salicylate directly activates AMPK via the β1 subunit, but whether salsalate requires AMPK-β1 to improve T2D and NAFLD has not been examined. Therefore, wild-type (WT) and AMPK-β1-knockout (AMPK-β1KO) mice were treated with a salsalate dose resulting in clinically relevant serum salicylate concentrations (∼1 mmol/L). Salsalate treatment increased VO2, lowered fasting glucose, improved glucose tolerance, and led to an ∼55% reduction in liver lipid content. These effects were observed in both WT and AMPK-β1KO mice. To explain these AMPK-independent effects, we found that salicylate increases oligomycin-insensitive respiration (state 4o) and directly increases mitochondrial proton conductance at clinical concentrations. This uncoupling effect is tightly correlated with the suppression of de novo lipogenesis. Salicylate is also able to stimulate brown adipose tissue respiration independent of uncoupling protein 1. These data indicate that the primary mechanism by which salsalate improves glucose homeostasis and NAFLD is via salicylate-driven mitochondrial uncoupling.
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Affiliation(s)
- Brennan K Smith
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Rebecca J Ford
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Eric M Desjardins
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Alex E Green
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Meghan C Hughes
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - Vanessa P Houde
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Emily A Day
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Katarina Marcinko
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Justin D Crane
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Emilio P Mottillo
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Christopher G R Perry
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - Bruce E Kemp
- Protein Chemistry and Metabolism, St Vincent's Institute and Department of Medicine, University of Melbourne, Melbourne, Victoria, Australia
- Mary MacKillop Institute for Health Research, Australian Catholic University, Fitzroy, Victoria, Australia
| | - Mark A Tarnopolsky
- Department of Pediatrics, McMaster University, Hamilton, Ontario, Canada
| | - Gregory R Steinberg
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
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Perry CGR, Wright DC. Challenging dogma: is hepatic lipid accumulation in type 2 diabetes due to mitochondrial dysfunction? J Physiol 2016; 594:4093-4. [PMID: 27477604 DOI: 10.1113/jp272573] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Affiliation(s)
- Christopher G R Perry
- School of Kinesiology and Health Science, Muscle Health Research Centre, York University, Toronto, ON, Canada, M3J 1P3.
| | - David C Wright
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada, N1G 2W1
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42
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MacPherson REK, Dragos SM, Ramos S, Sutton C, Frendo-Cumbo S, Castellani L, Watt MJ, Perry CGR, Mutch DM, Wright DC. Reduced ATGL-mediated lipolysis attenuates β-adrenergic-induced AMPK signaling, but not the induction of PKA-targeted genes, in adipocytes and adipose tissue. Am J Physiol Cell Physiol 2016; 311:C269-76. [PMID: 27357546 DOI: 10.1152/ajpcell.00126.2016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 06/23/2016] [Indexed: 12/25/2022]
Abstract
5'-AMP-activated protein kinase (AMPK) is activated as a consequence of lipolysis and has been shown to play a role in regulation of adipose tissue mitochondrial content. Conversely, the inhibition of lipolysis has been reported to potentiate the induction of protein kinase A (PKA)-targeted genes involved in the regulation of oxidative metabolism. The purpose of the current study was to address these apparent discrepancies and to more fully examine the relationship between lipolysis, AMPK, and the β-adrenergic-mediated regulation of gene expression. In 3T3-L1 adipocytes, the adipose tissue triglyceride lipase (ATGL) inhibitor ATGListatin attenuated the Thr(172) phosphorylation of AMPK by a β3-adrenergic agonist (CL 316,243) independent of changes in PKA signaling. Similarly, CL 316,243-induced increases in the Thr(172) phosphorylation of AMPK were reduced in adipose tissue from whole body ATGL-deficient mice. Despite reductions in the activation of AMPK, the induction of PKA-targeted genes was intact or, in some cases, increased. Similarly, markers of mitochondrial content and respiration were increased in adipose tissue from ATGL knockout mice independent of changes in the Thr(172) phosphorylation of AMPK. Taken together, our data provide evidence that AMPK is not required for the regulation of adipose tissue oxidative capacity in conditions of reduced fatty acid release.
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Affiliation(s)
- Rebecca E K MacPherson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Steven M Dragos
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Sofhia Ramos
- School of Kinesiology and Health Sciences, York University, Toronto, Ontario, Canada; and
| | - Charles Sutton
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Scott Frendo-Cumbo
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Laura Castellani
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Matthew J Watt
- Monash Biomedicine Discovery Institute, Metabolic Disease and Obesity Program, and Department of Physiology, Monash University, Clayton, Victoria, Australia
| | - Christopher G R Perry
- School of Kinesiology and Health Sciences, York University, Toronto, Ontario, Canada; and
| | - David M Mutch
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - David C Wright
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada;
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43
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Ydfors M, Hughes MC, Laham R, Schlattner U, Norrbom J, Perry CGR. Modelling in vivo creatine/phosphocreatine in vitro reveals divergent adaptations in human muscle mitochondrial respiratory control by ADP after acute and chronic exercise. J Physiol 2016; 594:3127-40. [PMID: 26631938 DOI: 10.1113/jp271259] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Accepted: 11/19/2015] [Indexed: 01/14/2023] Open
Abstract
KEY POINTS Mitochondrial respiratory sensitivity to ADP is thought to influence muscle fitness and is partly regulated by cytosolic-mitochondrial diffusion of ADP or phosphate shuttling via creatine/phosphocreatine (Cr/PCr) through mitochondrial creatine kinase (mtCK). Previous measurements of respiration in vitro with Cr (saturate mtCK) or without (ADP/ATP diffusion) show mixed responses of ADP sensitivity following acute exercise vs. less sensitivity after chronic exercise. In human muscle, modelling in vivo 'exercising' [Cr:PCr] during in vitro assessments revealed novel responses to exercise that differ from detections with or without Cr (±Cr). Acute exercise increased ADP sensitivity when measured without Cr but had no effect ±Cr or with +Cr:PCr, whereas chronic exercise increased sensitivity ±Cr but lowered sensitivity with +Cr:PCr despite increased markers of mitochondrial oxidative capacity. Controlling in vivo conditions during in vitro respiratory assessments reveals responses to exercise that differ from typical ±Cr comparisons and challenges our understanding of how exercise improves metabolic control in human muscle. ABSTRACT Mitochondrial respiratory control by ADP (Kmapp ) is viewed as a critical regulator of muscle energy homeostasis. However, acute exercise increases, decreases or has no effect on Kmapp in human muscle, whereas chronic exercise surprisingly decreases sensitivity despite greater mitochondrial content. We hypothesized that modelling in vivo mitochondrial creatine kinase (mtCK)-dependent phosphate-shuttling conditions in vitro would reveal increased sensitivity (lower Kmapp ) after acute and chronic exercise. The Kmapp was determined in vitro with 20 mm Cr (+Cr), 0 mm Cr (-Cr) or 'in vivo exercising' 20 mm Cr/2.4 mm PCr (Cr:PCr) on vastus lateralis biopsies sampled from 11 men before, immediately after and 3 h after exercise on the first, fifth and ninth sessions over 3 weeks. Dynamic responses to acute exercise occurred throughout training, whereby the first session did not change Kmapp with in vivo Cr:PCr despite increases in -Cr. The fifth session decreased sensitivity with Cr:PCr or +Cr despite no change in -Cr. Chronic exercise increased sensitivity ±Cr in association with increased electron transport chain content (+33-62% complexes I-V), supporting classic proposals that link increased sensitivity to oxidative capacity. However, in vivo Cr:PCr reveals a perplexing decreased sensitivity, contrasting the increases seen ±Cr. Functional responses occurred without changes in fibre type or proteins regulating mitochondrial-cytosolic energy exchange (mtCK, VDAC and ANT). Despite the dynamic responses seen with ±Cr, modelling in vivo phosphate-shuttling conditions in vitro reveals that ADP sensitivity is unchanged after high-intensity exercise and is decreased after training. These findings challenge our understanding of how exercise regulates skeletal muscle energy homeostasis.
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Affiliation(s)
- Mia Ydfors
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Meghan C Hughes
- School of Kinesiology and Health Science, York University, Toronto, ON, Canada.,Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Robert Laham
- Muscle Health Research Centre, York University, Toronto, ON, Canada
| | - Uwe Schlattner
- Laboratory of Fundamental and Applied Bioenergetics (LBFA) and SFR Environmental and Systems Biology (BEeSy), University Grenoble Alpes, Grenoble, France
| | - Jessica Norrbom
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Christopher G R Perry
- School of Kinesiology and Health Science, York University, Toronto, ON, Canada.,Muscle Health Research Centre, York University, Toronto, ON, Canada
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Hughes MC, Ramos SV, Turnbull PC, Nejatbakhsh A, Baechler BL, Tahmasebi H, Laham R, Gurd BJ, Quadrilatero J, Kane DA, Perry CGR. Mitochondrial Bioenergetics and Fiber Type Assessments in Microbiopsy vs. Bergstrom Percutaneous Sampling of Human Skeletal Muscle. Front Physiol 2015; 6:360. [PMID: 26733870 PMCID: PMC4683189 DOI: 10.3389/fphys.2015.00360] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 11/16/2015] [Indexed: 01/22/2023] Open
Abstract
Microbiopsies of human skeletal muscle are increasingly adopted by physiologists for a variety of experimental assays given the reduced invasiveness of this procedure compared to the classic Bergstrom percutaneous biopsy technique. However, a recent report demonstrated lower mitochondrial respiration in saponin-permeabilized muscle fiber bundles (PmFB) prepared from microbiopsies vs. Bergstrom biopsies. We hypothesized that ADP-induced contraction (rigor) of smaller length microbiopsy PmFB causes a greater reduction in maximal respiration vs. Bergstrom, such that respiration could be increased by a myosin II ATPase-inhibitor (Blebbistatin; BLEB). Eleven males and females each received a 2 mm diameter percutaneous microbiopsy and a 5 mm diameter Bergstrom percutaneous biopsy in opposite legs. Glutamate/malate (5/0.5 mM)—supported respiration in microbiopsy PmFB was lower than Bergstrom at submaximal concentrations of ADP. 5 μM BLEB reduced this impairment such that there were no differences relative to Bergstrom ± BLEB. Surprisingly, pyruvate (5 mM)-supported respiration was not different between either biopsy technique ±BLEB, whereas BLEB increased succinate-supported respiration in Bergstrom only. H2O2 emission was lower in microbiopsy PmFB compared to Bergstrom PmFB in the presence of BLEB. Microbiopsies contained fewer type I fibers (37 vs. 47%) and more type IIX fibers (20 vs. 8%) compared to Bergstrom possibly due to sampling site depth and/or longitudinal location. These findings suggest that smaller diameter percutaneous biopsies yield lower glutamate-supported mitochondrial respiratory kinetics which is increased by preventing ADP-induced rigor with myosin inhibition. Microbiopsies of human skeletal muscle can be utilized for assessing mitochondrial respiratory kinetics in PmFB when assay conditions are supplemented with BLEB, but fiber type differences with this method should be considered.
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Affiliation(s)
- Meghan C Hughes
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University Toronto, ON, Canada
| | - Sofhia V Ramos
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University Toronto, ON, Canada
| | - Patrick C Turnbull
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University Toronto, ON, Canada
| | - Ali Nejatbakhsh
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University Toronto, ON, Canada
| | | | - Houman Tahmasebi
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University Toronto, ON, Canada
| | - Robert Laham
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University Toronto, ON, Canada
| | - Brendon J Gurd
- School of Kinesiology and Health Studies, Queen's University Kingston, ON, Canada
| | - Joe Quadrilatero
- Department of Kinesiology, University of Waterloo Waterloo, ON, Canada
| | - Daniel A Kane
- Department of Human Kinetics, St. Francis Xavier University Antigonish, NS, Canada
| | - Christopher G R Perry
- Muscle Health Research Centre, School of Kinesiology and Health Science, York University Toronto, ON, Canada
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Castellani L, Perry CGR, Macpherson REK, Root-McCaig J, Huber JS, Arkell AM, Simpson JA, Wright DC. Exercise-mediated IL-6 signaling occurs independent of inflammation and is amplified by training in mouse adipose tissue. J Appl Physiol (1985) 2015; 119:1347-54. [PMID: 26472868 DOI: 10.1152/japplphysiol.00551.2015] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 10/05/2015] [Indexed: 01/24/2023] Open
Abstract
The purpose of this investigation was to determine whether exercise-induced increases in adipose tissue interleukin 6 (IL-6) signaling occurred as part of a larger proinflammatory response to exercise and whether the induction of IL-6 signaling with acute exercise was altered in trained mice in parallel with changes in the IL-6 receptor complex. Sedentary and trained C57BL/6J mice were challenged with an acute bout of exercise. Adipose tissue and plasma were collected immediately and 4 h afterward and analyzed for changes in indices of IL-6 signaling, circulating IL-6, markers of adipose tissue inflammation, and expression/content of IL-6 receptor and glycoprotein 130 (gp130). In untrained mice, IL-6 mRNA increased immediately after exercise, and increases in indices of IL-6 signaling were increased 4 h after exercise in epididymal, but not inguinal adipose tissue. This occurred independent of increases in plasma IL-6 and alterations in markers of inflammation. When compared with untrained mice, in trained mice, acute exercise induced the expression of gp130 and IL-6 receptor alpha (IL-6Rα), and training increased the protein content of these. Acute exercise induced the expression, and training increased the protein content, of glycoprotein 130 and IL-6Rα and was associated with a more rapid increase in markers of IL-6 signaling in epididymal adipose tissue from trained compared with untrained mice. The ability of exogenous IL-6 to increase phosphorylation of STAT3 was similar between groups. Our findings demonstrate that acute exercise increases IL-6 signaling in a depot-dependent manner, likely through an autocrine/paracrine mechanism. This response is initiated more rapidly after exercise in trained mice, potentially as a result of increases in IL-6Rα and gp130.
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Affiliation(s)
- Laura Castellani
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - Christopher G R Perry
- Faculty of Health, School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - Rebecca E K Macpherson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - Jared Root-McCaig
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - Jason S Huber
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - Alicia M Arkell
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada; and
| | - David C Wright
- Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada; and
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De Sousa M, Porras DP, Perry CGR, Seale P, Scimè A. p107 is a crucial regulator for determining the adipocyte lineage fate choices of stem cells. Stem Cells 2014; 32:1323-36. [PMID: 24449206 DOI: 10.1002/stem.1637] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 11/20/2013] [Indexed: 12/11/2022]
Abstract
Thermogenic (beige and brown) adipocytes protect animals against obesity and metabolic disease. However, little is known about the mechanisms that commit stem cells toward different adipocyte lineages. We show here that p107 is a master regulator of adipocyte lineage fates, its suppression required for commitment of stem cells to the brown-type fate. p107 is strictly expressed in the stem cell compartment of white adipose tissue depots and completely absent in brown adipose tissue. Remarkably, p107-deficient stem cells uniformly give rise to brown-type adipocytes in vitro and in vivo. Furthermore, brown fat programming of mesenchymal stem cells by PRDM-BF1-RIZ1 homologous domain containing 16 (Prdm16) was associated with a dramatic reduction of p107 levels. Indeed, Prdm16 directly suppressed p107 transcription via promoter binding. Notably, the sustained expression of p107 blocked the ability of Prdm16 to induce brown fat genes. These findings demonstrate that p107 expression in stem cells commits cells to the white versus brown adipose lineage.
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Affiliation(s)
- Martina De Sousa
- Stem Cell Research Group, Faculty of Health, York University, Toronto, Ontario, Canada
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Kang L, Dai C, Lustig ME, Bonner JS, Mayes WH, Mokshagundam S, James FD, Thompson CS, Lin CT, Perry CGR, Anderson EJ, Neufer PD, Wasserman DH, Powers AC. Heterozygous SOD2 deletion impairs glucose-stimulated insulin secretion, but not insulin action, in high-fat-fed mice. Diabetes 2014; 63:3699-710. [PMID: 24947366 PMCID: PMC4207395 DOI: 10.2337/db13-1845] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Elevated reactive oxygen species (ROS) are linked to insulin resistance and islet dysfunction. Manganese superoxide dismutase (SOD2) is a primary defense against mitochondrial oxidative stress. To test the hypothesis that heterozygous SOD2 deletion impairs glucose-stimulated insulin secretion (GSIS) and insulin action, wild-type (sod2(+/+)) and heterozygous knockout mice (sod2(+/-)) were fed a chow or high-fat (HF) diet, which accelerates ROS production. Hyperglycemic (HG) and hyperinsulinemic-euglycemic (HI) clamps were performed to assess GSIS and insulin action in vivo. GSIS during HG clamps was equal in chow-fed sod2(+/-) and sod2(+/+) but was markedly decreased in HF-fed sod2(+/-). Remarkably, this impairment was not paralleled by reduced HG glucose infusion rate (GIR). Decreased GSIS in HF-fed sod2(+/-) was associated with increased ROS, such as superoxide ion. Surprisingly, insulin action determined by HI clamps did not differ between sod2(+/-) and sod2(+/+) of either diet. Since insulin action was unaffected, we hypothesized that the unchanged HG GIR in HF-fed sod2(+/-) was due to increased glucose effectiveness. Increased GLUT-1, hexokinase II, and phospho-AMPK protein in muscle of HF-fed sod2(+/-) support this hypothesis. We conclude that heterozygous SOD2 deletion in mice, a model that mimics SOD2 changes observed in diabetic humans, impairs GSIS in HF-fed mice without affecting insulin action.
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Affiliation(s)
- Li Kang
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN Mouse Metabolic Phenotyping Center, Vanderbilt University, Nashville, TN Division of Cardiovascular and Diabetes Medicine, Ninewells Hospital and Medical School, University of Dundee, Dundee, U.K.
| | - Chunhua Dai
- Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Vanderbilt University, Nashville, TN
| | - Mary E Lustig
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Jeffrey S Bonner
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Wesley H Mayes
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Shilpa Mokshagundam
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Freyja D James
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Courtney S Thompson
- Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Vanderbilt University, Nashville, TN
| | - Chien-Te Lin
- East Carolina Diabetes and Obesity Institute and Departments of Physiology and Kinesiology, East Carolina University, Greenville, NC
| | - Christopher G R Perry
- East Carolina Diabetes and Obesity Institute and Departments of Physiology and Kinesiology, East Carolina University, Greenville, NC
| | - Ethan J Anderson
- East Carolina Diabetes and Obesity Institute and Departments of Physiology and Kinesiology, East Carolina University, Greenville, NC
| | - P Darrell Neufer
- East Carolina Diabetes and Obesity Institute and Departments of Physiology and Kinesiology, East Carolina University, Greenville, NC
| | - David H Wasserman
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN Mouse Metabolic Phenotyping Center, Vanderbilt University, Nashville, TN
| | - Alvin C Powers
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Vanderbilt University, Nashville, TN Veterans Affairs Tennessee Valley Healthcare System, Nashville, TN
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Williams CB, Hughes MC, Edgett BA, Scribbans TD, Simpson CA, Perry CGR, Gurd BJ. An examination of resveratrol's mechanisms of action in human tissue: impact of a single dose in vivo and dose responses in skeletal muscle ex vivo. PLoS One 2014; 9:e102406. [PMID: 25019209 PMCID: PMC4096915 DOI: 10.1371/journal.pone.0102406] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2014] [Accepted: 06/18/2014] [Indexed: 01/02/2023] Open
Abstract
The current study tested the hypothesis that a single, moderate dose of RSV would activate the AMPK/SIRT1 axis in human skeletal muscle and adipose tissue. Additionally, the effects of RSV on mitochondrial respiration in PmFBs were examined. Eight sedentary men (23.8±2.4 yrs; BMI: 32.7±7.1) reported to the lab on two occasions where they were provided a meal supplemented with 300 mg of RSV or a placebo. Blood samples, and a muscle biopsy were obtained in the fasted state and again, with the addition of an adipose tissue biopsy, two hours post-prandial. The effect of RSV on mitochondrial respiration was examined in PmFBs taken from muscle biopsies from an additional eight men (23.4±5.4 yrs; BMI: 24.4±2.8). No effect of RSV was observed on nuclear SIRT1 activity, acetylation of p53, or phosphorylation of AMPK, ACC or PKA in either skeletal muscle or adipose tissue. A decrease in post absorptive insulin levels was accompanied by elevated skeletal muscle phosphorylation of p38 MAPK, but no change in either skeletal muscle or adipose tissue insulin signalling. Mitochondrial respiration in PmFBs was rapidly inhibited by RSV at 100–300 uM depending on the substrate examined. These results question the efficacy of a single dose of RSV at altering skeletal muscle and adipose tissue AMPK/SIRT1 activity in humans and suggest that RSV mechanisms of action in humans may be associated with altered cellular energetics resulting from impaired mitochondrial ATP production.
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Affiliation(s)
- Cameron B. Williams
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada
| | - Meghan C. Hughes
- School of Kinesiology and Health Science, York University, Toronto, Ontario, Canada
| | - Brittany A. Edgett
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada
| | - Trisha D. Scribbans
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada
| | - Craig A. Simpson
- Department of Emergency Medicine, Queen's University, Kingston, Ontario, Canada
| | | | - Brendon J. Gurd
- School of Kinesiology and Health Studies, Queen's University, Kingston, Ontario, Canada
- * E-mail:
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Beaudoin MS, Perry CGR, Arkell AM, Chabowski A, Simpson JA, Wright DC, Holloway GP. Impairments in mitochondrial palmitoyl-CoA respiratory kinetics that precede development of diabetic cardiomyopathy are prevented by resveratrol in ZDF rats. J Physiol 2014; 592:2519-33. [PMID: 24639481 DOI: 10.1113/jphysiol.2013.270538] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Alterations in lipid metabolism within the heart may have a causal role in the establishment of diabetic cardiomyopathy; however, this remains equivocal. Therefore, in the current study we determined cardiac mitochondrial bioenergetics in ZDF rats before overt type 2 diabetes and diabetic cardiomyopathy developed. In addition, we utilized resveratrol, a compound previously shown to improve, prevent or reverse cardiac dysfunction in high-fat-fed rodents, as a tool to potentially recover dysfunctions within mitochondria. Fasting blood glucose and invasive left ventricular haemodynamic analysis confirmed the absence of type 2 diabetes and diabetic cardiomyopathy. However, fibrosis was already increased (P < 0.05) ∼70% in ZDF rats at this early stage in disease progression. Assessments of mitochondrial ADP and pyruvate respiratory kinetics in permeabilized fibres from the left ventricle revealed normal electron transport chain function and content. In contrast, the apparent Km to palmitoyl-CoA (P-CoA) was increased (P < 0.05) ∼60%, which was associated with an accumulation of intracellular triacylgycerol, diacylglycerol and ceramide species. In addition, the capacity for mitochondrial reactive oxygen species emission was increased (P < 0.05) ∼3-fold in ZDF rats. The provision of resveratrol reduced fibrosis, P-CoA respiratory sensitivity, reactive lipid accumulation and mitochondrial reactive oxygen species emission rates. Altogether the current data support the supposition that a chronic dysfunction within mitochondrial lipid-supported bioenergetics contributes to the development of diabetic cardiomyopathy, as this was present before overt diabetes or cardiac dysfunction. In addition, we show that resveratrol supplementation prevents these changes, supporting the belief that resveratrol is a potent therapeutic approach for preventing diabetic cardiomyopathy.
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Affiliation(s)
- Marie-Soleil Beaudoin
- Department of Human Health and Nutritional Sciences, University of Guelph, Ontario, Canada, N1G 2W1
| | - Christopher G R Perry
- School of Kinesiology and Health Science, Faculty of Health, York University, Toronto, Ontario, Canada, M3J 1P3
| | - Alicia M Arkell
- Department of Human Health and Nutritional Sciences, University of Guelph, Ontario, Canada, N1G 2W1
| | - Adrian Chabowski
- Department of Physiology, Medical University of Bialystok, 15-222 Bialystok, Poland
| | - Jeremy A Simpson
- Department of Human Health and Nutritional Sciences, University of Guelph, Ontario, Canada, N1G 2W1
| | - David C Wright
- Department of Human Health and Nutritional Sciences, University of Guelph, Ontario, Canada, N1G 2W1
| | - Graham P Holloway
- Department of Human Health and Nutritional Sciences, University of Guelph, Ontario, Canada, N1G 2W1
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DeBalsi KL, Wong KE, Koves TR, Slentz DH, Seiler SE, Wittmann AH, Ilkayeva OR, Stevens RD, Perry CGR, Lark DS, Hui ST, Szweda L, Neufer PD, Muoio DM. Targeted metabolomics connects thioredoxin-interacting protein (TXNIP) to mitochondrial fuel selection and regulation of specific oxidoreductase enzymes in skeletal muscle. J Biol Chem 2014; 289:8106-20. [PMID: 24482226 DOI: 10.1074/jbc.m113.511535] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Thioredoxin-interacting protein (TXNIP) is an α-arrestin family member involved in redox sensing and metabolic control. Growing evidence links TXNIP to mitochondrial function, but the molecular nature of this relationship has remained poorly defined. Herein, we employed targeted metabolomics and comprehensive bioenergetic analyses to evaluate oxidative metabolism and respiratory kinetics in mouse models of total body (TKO) and skeletal muscle-specific (TXNIP(SKM-/-)) Txnip deficiency. Compared with littermate controls, both TKO and TXNIP(SKM-/-) mice had reduced exercise tolerance in association with muscle-specific impairments in substrate oxidation. Oxidative insufficiencies in TXNIP null muscles were not due to perturbations in mitochondrial mass, the electron transport chain, or emission of reactive oxygen species. Instead, metabolic profiling analyses led to the discovery that TXNIP deficiency causes marked deficits in enzymes required for catabolism of branched chain amino acids, ketones, and lactate, along with more modest reductions in enzymes of β-oxidation and the tricarboxylic acid cycle. The decrements in enzyme activity were accompanied by comparable deficits in protein abundance without changes in mRNA expression, implying dysregulation of protein synthesis or stability. Considering that TXNIP expression increases in response to starvation, diabetes, and exercise, these findings point to a novel role for TXNIP in coordinating mitochondrial fuel switching in response to nutrient availability.
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