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Wang J, Zhang L, Cao H, Shi X, Zhang X, Gao Z, Ikeda K, Yan T, Jia Y, Xu F. Silibinin improves L-cell mass and function through an estrogen receptor-mediated antioxidative mechanism. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2022; 99:154022. [PMID: 35255283 DOI: 10.1016/j.phymed.2022.154022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Revised: 02/05/2022] [Accepted: 02/25/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Silibinin, a major component of milk thistle extract silymarin, promotes hypoglycemia by activating estrogen receptor (ER) α and β-mediated pathways in pancreatic β-cells. Glucagon-like peptide-1 (GLP-1) is the enteroendocrine peptide produced in L-cells, and it controls glucose homeostasis through multiple pathways. The effect of silibinin on L-cell mass and function is still unknown. PURPOSE The protective effect of silibinin on palmitate (PA)-treated intestinal L-cell line GLUTag cells and the SHRSP•Z-Leprfa/Izm-Dmcr (SP•ZF) diabetic rat model was investigated in current study. METHODS After pre-incubation with 50 μM silibinin for 4 h, GLUTag cells were treated with 0.125 mM PA. MTT, Annexin V/PI apoptosis, Hoechst 33342 staining, western blot, DCFH-DA, GLP-1 ELISA, qRT-PCR and immunofluorescence analyses were undertaken to determine ER-dependent protection of silibinin against PA-induced cellular damage. The differential protein expression of GLUTag cells under different treatments was examined by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS). The SP•ZF diabetic rat model was chosen for in vivo study. After 4 weeks of gastric gavage with 100 or 300 mg kg-1 of silibinin, the physiological indexes of the rats were measured. Cells expressing GLP-1, 8‑hydroxy-2'-deoxyguanosine (8-OHdG), ERα, and/or ERβ in duodenum tissues were detected by immunofluorescence. RESULTS The current study showed that the GLUTag cells preincubated with silibinin activated the transcription factor nuclear erythroid-2 like factor-2 (Nrf2)-antioxidant pathway, reduced reactive oxygen species (ROS) generation, and improved cell survival and GLP-1 content, while the antioxidative effect of silibinin was blocked by the selective ERα antagonist MPP or ERβ antagonist PHTPP in GLUTag cells. Our proteomics data further revealed that ERα or β inactivation reduced glutathione peroxide and proteins associated with endocytosis and reproduction, thus at least partially reversing the protective effect of silibinin. SP•ZF rats received silibinin treatment showed increased serum GLP-1 content and improved glucose homeostasis. Furthermore, silibinin upregulated ERα and β levels and reduced the level of 8-OHdG in GLP-1-positive cells. CONCLUSIONS Our study showed that silibinin improved L-cell mass and function through an ER-mediated antioxidant pathway, and the proteomics analysis revealed for the first time the differential regulation of proteins by PA and silibinin in GLUTag cells.
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Affiliation(s)
- Jinyu Wang
- Faculty of Functional Food and Wine, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Luxin Zhang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Hao Cao
- School of Life Science and Bio-pharmaceutics, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China; School of Medicine, Tsinghua University, Beijing 100084, P.R. China
| | - Xinyi Shi
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Xiaorong Zhang
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Zihao Gao
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Katsumi Ikeda
- School of Pharmaceutical Sciences, Mukogawa Women's University, Nishinomiya 663-8179, Japan
| | - Tingxu Yan
- Faculty of Functional Food and Wine, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China
| | - Ying Jia
- Faculty of Functional Food and Wine, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
| | - Fanxing Xu
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang 110016, P.R. China.
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Liu J, He Q. Ca 2+/calmodulin-dependent protein kinase IV attenuates inflammation and mitochondrial dysfunction under insulin resistance in C2C12 cells. Arch Physiol Biochem 2020; 129:690-699. [PMID: 33370547 DOI: 10.1080/13813455.2020.1861028] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
CaMKIV has been reported involved in the improvement of whole-body insulin sensitivity and mitochondrial biogenesis of skeletal muscle. Here, we first investigate the effects of CaMKIV on glucose metabolism, cell viability, inflammatory function, and mitochondrial function in palmitate-induced C2C12 cells of insulin resistance. Then we explored the potential mechanism of these effects. Differentiated C2C12 cells were treated with or without 100 ng/ml of CaMKIV under palmitate-induced insulin resistance. The results suggest palmitate induced insulin sensitivity, reduced glucose uptake, decreased cell viability, increased inflammatory factors, and caused mitochondrial dysfunction in C2C12 cells. Of note, CaMKIV reversed palmitate-induced insulin resistance, increased the reduction of glucose uptake, inhibited inflammatory response, and mitochondrial dysfunction, despite of no change in cells viabilities. However, these beneficial effects of CaMKIV were blocked by the downregulation of CREB1. Taken together, our data demonstrated CaMKIV prevents palmitate-induced insulin resistance, inflammatory response, and mitochondrial dysfunction through phosphorylated CREB1 in differentiated C2C12 cells.
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Affiliation(s)
- Jiali Liu
- Department of Clinical Laboratory, Xi'an Jiaotong University Second Affiliated Hospital, Xi'an, Shaanxi, China
| | - Qian He
- Department of Clinical Laboratory, Xi'an Jiaotong University Second Affiliated Hospital, Xi'an, Shaanxi, China
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Graham ZA, Siedlik JA, Harlow L, Sahbani K, Bauman WA, Tawfeek HA, Cardozo CP. Key Glycolytic Metabolites in Paralyzed Skeletal Muscle Are Altered Seven Days after Spinal Cord Injury in Mice. J Neurotrauma 2019; 36:2722-2731. [PMID: 30869558 DOI: 10.1089/neu.2018.6144] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Spinal cord injury (SCI) results in rapid muscle atrophy and an oxidative-to-glycolytic fiber-type shift. Those with chronic SCI are more at risk for developing insulin resistance and reductions in glucose clearance than able-bodied individuals, but how glucose metabolism is affected after SCI is not well known. An untargeted metabolomics approach was utilized to investigate changes in whole-muscle metabolites at an acute (7-day) and subacute (28-day) time frame after a complete T9 spinal cord transection in 20-week-old female C57BL/6 mice. Two hundred one metabolites were detected in all samples, and 83 had BinBase IDs. A principal components analysis showed the 7-day group as a unique cluster. Further, 36 metabolites were altered after 7- and/or 28-day post-SCI (p values <0.05), with 12 passing further false discovery rate exclusion criteria; of those 12 metabolites, three important glycolytic molecules-glucose and downstream metabolites pyruvic acid and lactic acid-were reduced at 7 days compared to those values in sham and/or 28-day animals. These changes were associated with altered expression of proteins associated with glycolysis, as well as monocarboxylate transporter 4 gene expression. Taken together, our data suggest an acute disruption of skeletal muscle glucose uptake at 7 days post-SCI, which leads to reduced pyruvate and lactate levels. These levels recover by 28 days post-SCI, but a reduction in pyruvate dehydrogenase protein expression at 28 days post-SCI implies disruption in downstream oxidation of glucose.
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Affiliation(s)
- Zachary A Graham
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA Medical Center, Bronx, New York.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | | | - Lauren Harlow
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA Medical Center, Bronx, New York
| | - Karim Sahbani
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA Medical Center, Bronx, New York
| | - William A Bauman
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA Medical Center, Bronx, New York.,Medical Service, James J. Peters VA Medical Center, Bronx, New York.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York.,Department of Rehabilitation Medicine and Human Performance, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Hesham A Tawfeek
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA Medical Center, Bronx, New York.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Christopher P Cardozo
- National Center for the Medical Consequences of Spinal Cord Injury, James J. Peters VA Medical Center, Bronx, New York.,Medical Service, James J. Peters VA Medical Center, Bronx, New York.,Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York.,Department of Rehabilitation Medicine and Human Performance, Icahn School of Medicine at Mount Sinai, New York, New York
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Nicholson T, Church C, Tsintzas K, Jones R, Breen L, Davis ET, Baker DJ, Jones SW. Vaspin promotes insulin sensitivity of elderly muscle and is upregulated in obesity. J Endocrinol 2019; 241:JOE-18-0528.R3. [PMID: 30721136 DOI: 10.1530/joe-18-0528] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 02/05/2019] [Indexed: 02/02/2023]
Abstract
Adipokines have emerged as central mediators of insulin sensitivity and metabolism, in part due to the known association of obesity with metabolic syndrome disorders such as type 2 diabetes. Recent studies in rodents have identified the novel adipokine vaspin, as playing a protective role in inflammatory metabolic diseases by functioning to promote insulin sensitivity during metabolic stress. However, at present the skeletal muscle and adipose tissue expression of vaspin in humans is poorly characterised. Furthermore, the functional role of vaspin in skeletal muscle insulin sensitivity has not been studied. Since skeletal muscle is the major tissue for insulin-stimulated glucose uptake understanding the functional role of vaspin in human muscle insulin signalling is critical in determining its role in glucose homeostasis. The objective of this study was to profile the skeletal muscle and subcutaneous adipose tissue expression of vaspin in humans of varying adiposity and to determine the functional role of vaspin in mediating insulin signalling and glucose uptake in human skeletal muscle. Our data shows that vaspin is secreted from both human subcutaneous adipose tissue and skeletal muscle, and is more highly expressed in obese older individuals compared to lean older individuals. Furthermore, we demonstrate that vaspin induces activation of the PI3K/AKT axis, independent of insulin receptor activation, promotes GLUT4 expression and translocation and sensitises older obese human skeletal muscle to insulin-mediated glucose uptake.
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Affiliation(s)
- Tom Nicholson
- T Nicholson, Institute of Inflammation and Ageing, University of Birmingham, Nottingham, United Kingdom of Great Britain and Northern Ireland
| | - Chris Church
- C Church, Cardiovascular and Metabolic Disease, MedImmune, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Kostas Tsintzas
- K Tsintzas, School of Life Sciences, University of Nottingham, Nottingham, NG82AB, United Kingdom of Great Britain and Northern Ireland
| | - Robert Jones
- R Jones, School of Life Sciences, University of Nottingham, Nottingham, United Kingdom of Great Britain and Northern Ireland
| | - Leigh Breen
- L Breen, MRC-ARUK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, United Kingdom of Great Britain and Northern Ireland
| | - Edward T Davis
- E Davis, Research and Development, Royal Orthopaedic Hospital NHS Foundation Trust, Birmingham, United Kingdom of Great Britain and Northern Ireland
| | - David J Baker
- D Baker, Cardiovascular and Metabolic Disease, MedImmune, Cambridge, United Kingdom of Great Britain and Northern Ireland
| | - Simon W Jones
- S Jones, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, B15 2WB, United Kingdom of Great Britain and Northern Ireland
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Callahan ZJ, Oxendine M, Wheatley JL, Menke C, Cassell EA, Bartos A, Geiger PC, Schaeffer PJ. Compensatory responses of the insulin signaling pathway restore muscle glucose uptake following long-term denervation. Physiol Rep 2015; 3:3/4/e12359. [PMID: 25896980 PMCID: PMC4425965 DOI: 10.14814/phy2.12359] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
We investigated the role of muscle activity in maintaining normal glucose homeostasis via transection of the sciatic nerve, an extreme model of disuse atrophy. Mice were killed 3, 10, 28, or 56 days after transection or sham surgery. There was no difference in muscle weight between sham and transected limbs at 3 days post surgery, but it was significantly lower following transection at the other three time points. Transected muscle weight stabilized by 28 days post surgery with no further loss. Myocellular cross-sectional area was significantly smaller at 10, 28, and 56 days post transection surgery. Additionally, muscle fibrosis area was significantly greater at 56 days post transection. In transected muscle there was reduced expression of genes encoding transcriptional regulators of metabolism (PPARα, PGC-1α, PGC-1β, PPARδ), a glycolytic enzyme (PFK), a fatty acid transporter (M-CPT 1), and an enzyme of mitochondrial oxidation (CS) with transection. In denervated muscle, glucose uptake was significantly lower at 3 days but was greater at 56 days under basal and insulin-stimulated conditions. Although GLUT 4 mRNA was significantly lower at all time points in transected muscle, Western blot analysis showed greater expression of GLUT4 at 28 and 56 days post surgery. GLUT1 mRNA was unchanged; however, GLUT1 protein expression was also greater in transected muscles. Surgery led to significantly higher protein expression for Akt2 as well as higher phosphorylation of Akt. While denervation may initially lead to reduced glucose sensitivity, compensatory responses of insulin signaling appeared to restore and improve glucose uptake in long-term-transected muscle.
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Affiliation(s)
| | | | - Joshua L Wheatley
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas
| | - Chelsea Menke
- Department of Biology, Miami University, Oxford, Ohio
| | | | - Amanda Bartos
- Department of Biology, Miami University, Oxford, Ohio
| | - Paige C Geiger
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas
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Grubišić V, Parpura V. Diversity in the utilization of glucose and lactate in synthetic mammalian myotubes generated by engineered configurations of MyoD and E12 in otherwise non-differentiation growth conditions. Biomaterials 2014; 43:50-60. [PMID: 25591961 DOI: 10.1016/j.biomaterials.2014.12.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 12/03/2014] [Indexed: 12/21/2022]
Abstract
We previously used the expression of various combinations and configurations of MyoD and E12, two basic helix-loop-helix transcription factors (TF), to produce populations of myotubes assuming distinct morphology, myofibrillar development and Ca2+ dynamics, from mammalian C2C12 myoblasts in non-differentiation growth conditions. Here, we assessed the synthetically generated myotubes in terms of energetics, otherwise necessary to sustain their mechanical output as bio-actuators. We found that the myotubes exhibit changed expression of key regulators for the uptake and utilization of two major cellular fuels, glucose and lactate. Furthermore, while lactate transport was uniformly slowed in all the populations of myotubes, glucose uptake and utilization were modified by particular TF configuration. Our approach allows the production of a class of biomaterials with predetermined energetics that could be applied in biorobotics, where fuel of choice could be used, and also in reparative medicine where, for example, particular population of myotubes could be additionally employed as glucose sinks to mitigate effects of secondary metabolic syndrome.
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Affiliation(s)
- Vladimir Grubišić
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Vladimir Parpura
- Department of Neurobiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA; Department of Biotechnology, University of Rijeka, 51000 Rijeka, Croatia.
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Abstract
Glucose is an important fuel for contracting muscle, and normal glucose metabolism is vital for health. Glucose enters the muscle cell via facilitated diffusion through the GLUT4 glucose transporter which translocates from intracellular storage depots to the plasma membrane and T-tubules upon muscle contraction. Here we discuss the current understanding of how exercise-induced muscle glucose uptake is regulated. We briefly discuss the role of glucose supply and metabolism and concentrate on GLUT4 translocation and the molecular signaling that sets this in motion during muscle contractions. Contraction-induced molecular signaling is complex and involves a variety of signaling molecules including AMPK, Ca(2+), and NOS in the proximal part of the signaling cascade as well as GTPases, Rab, and SNARE proteins and cytoskeletal components in the distal part. While acute regulation of muscle glucose uptake relies on GLUT4 translocation, glucose uptake also depends on muscle GLUT4 expression which is increased following exercise. AMPK and CaMKII are key signaling kinases that appear to regulate GLUT4 expression via the HDAC4/5-MEF2 axis and MEF2-GEF interactions resulting in nuclear export of HDAC4/5 in turn leading to histone hyperacetylation on the GLUT4 promoter and increased GLUT4 transcription. Exercise training is the most potent stimulus to increase skeletal muscle GLUT4 expression, an effect that may partly contribute to improved insulin action and glucose disposal and enhanced muscle glycogen storage following exercise training in health and disease.
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Affiliation(s)
- Erik A Richter
- Molecular Physiology Group, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark.
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Consitt LA, Van Meter J, Newton CA, Collier DN, Dar MS, Wojtaszewski JF, Treebak JT, Tanner CJ, Houmard JA. Impairments in site-specific AS160 phosphorylation and effects of exercise training. Diabetes 2013; 62:3437-47. [PMID: 23801578 PMCID: PMC3781473 DOI: 10.2337/db13-0229] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The purpose of this study was to determine if site-specific phosphorylation at the level of Akt substrate of 160 kDa (AS160) is altered in skeletal muscle from sedentary humans across a wide range of the adult life span (18-84 years of age) and if endurance- and/or strength-oriented exercise training could rescue decrements in insulin action and skeletal muscle AS160 phosphorylation. A euglycemic-hyperinsulinemic clamp and skeletal muscle biopsies were performed in 73 individuals encompassing a wide age range (18-84 years of age), and insulin-stimulated AS160 phosphorylation was determined. Decrements in whole-body insulin action were associated with impairments in insulin-induced phosphorylation of skeletal muscle AS160 on sites Ser-588, Thr-642, Ser-666, and phospho-Akt substrate, but not Ser-318 or Ser-751. Twelve weeks of endurance- or strength-oriented exercise training increased whole-body insulin action and reversed impairments in AS160 phosphorylation evident in insulin-resistant aged individuals. These findings suggest that a dampening of insulin-induced phosphorylation of AS160 on specific sites in skeletal muscle contributes to the insulin resistance evident in a sedentary aging population and that exercise training is an effective intervention for treating these impairments.
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Affiliation(s)
- Leslie A. Consitt
- Department of Biomedical Sciences, Ohio Musculoskeletal and Neurological Institute, Diabetes Institute, Ohio University, Athens, Ohio
- Corresponding author: Leslie A. Consitt,
| | - Jessica Van Meter
- Department of Kinesiology, Human Performance Laboratory, East Carolina University, Greenville, North Carolina
| | - Christopher A. Newton
- Division of Endocrinology, Metabolism and Lipids, Department of Internal Medicine, Emory University, Atlanta, Georgia
| | - David N. Collier
- Department of Pediatrics, Brody School of Medicine at East Carolina University, Greenville, North Carolina
| | - Moahad S. Dar
- Section of Endocrinology & Metabolism, Department of Internal Medicine, Brody School of Medicine at East Carolina University, Greenville, North Carolina
| | - Jørgen F.P. Wojtaszewski
- Molecular Physiology Group, The August Krogh Centre, Department of Exercise and Sport Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jonas T. Treebak
- Novo Nordisk Foundation Center for Basic Metabolic Research, Section on Integrative Physiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Charles J. Tanner
- Department of Kinesiology, Human Performance Laboratory, East Carolina University, Greenville, North Carolina
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
| | - Joseph A. Houmard
- Department of Kinesiology, Human Performance Laboratory, East Carolina University, Greenville, North Carolina
- East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, North Carolina
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Aas V, Bakke SS, Feng YZ, Kase ET, Jensen J, Bajpeyi S, Thoresen GH, Rustan AC. Are cultured human myotubes far from home? Cell Tissue Res 2013; 354:671-82. [PMID: 23749200 DOI: 10.1007/s00441-013-1655-1] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 05/03/2013] [Indexed: 12/25/2022]
Abstract
Satellite cells can be isolated from skeletal muscle biopsies, activated to proliferating myoblasts and differentiated into multinuclear myotubes in culture. These cell cultures represent a model system for intact human skeletal muscle and can be modulated ex vivo. The advantages of this system are that the most relevant genetic background is available for the investigation of human disease (as opposed to rodent cell cultures), the extracellular environment can be precisely controlled and the cells are not immortalized, thereby offering the possibility of studying innate characteristics of the donor. Limitations in differentiation status (fiber type) of the cells and energy metabolism can be improved by proper treatment, such as electrical pulse stimulation to mimic exercise. This review focuses on the way that human myotubes can be employed as a tool for studying metabolism in skeletal muscles, with special attention to changes in muscle energy metabolism in obesity and type 2 diabetes.
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Affiliation(s)
- Vigdis Aas
- Institute of Pharmacy and Biomedical Laboratory Science, Faculty of Health Sciences, Oslo and Akershus University College of Applied Sciences, Oslo, Norway,
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Yao CX, Xiong CJ, Wang WP, Yang F, Zhang SF, Wang TQ, Wang SL, Yu HL, Wei ZR, Zang MX. Transcription Factor GATA-6 Recruits PPARα to Cooperatively Activate Glut4 Gene Expression. J Mol Biol 2012; 415:143-58. [DOI: 10.1016/j.jmb.2011.11.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2011] [Revised: 10/26/2011] [Accepted: 11/07/2011] [Indexed: 12/20/2022]
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