1
|
Tamaki T, Muramatsu K, Ikutomo M, Komagata J. Effects of low-intensity exercise on contractile property of skeletal muscle and the number of motor neurons in diabetic rats. Anat Sci Int 2024; 99:106-117. [PMID: 37768514 DOI: 10.1007/s12565-023-00741-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 08/31/2023] [Indexed: 09/29/2023]
Abstract
The mode of diabetes-induced muscle and motor neuron damage depends on the type of muscle and motor neuron. One of the purposes of exercise therapy for diabetes is to improve blood glucose levels; however, information on the effects of low-intensity exercise on muscle and motor neuron disorders remain unknown. Therefore, this study aimed to examine the effects of low-intensity exercise on diabetes-induced muscle and motor neuron damage in a rat model of type 1 diabetes mellitus. We subjected adult male Wistar rats treated with streptozotocin to develop type 1 diabetes and age-matched rats to low-intensity treadmill exercise for 12 weeks. We recorded electrically evoked maximum twitch tension in leg muscles, and examined the number of motor neurons and cell body sizes. Low-intensity exercise ameliorated the prolonged half-relaxation time and the decreased numbers of the retrograde-labeled motor neurons observed in the soleus muscle of type 1 diabetic rats. However, no effect was observed in the diabetic group, as atrophy was not improved and the twitch force in the medial gastrocnemius muscle was decreased in the diabetic group. In addition, there was no improvement in the blood glucose levels after exercise. These data indicate that low-intensity exercise may relieve the onset of muscle and motor neuron damage in the soleus muscle of type 1 diabetic rats.
Collapse
Affiliation(s)
- Toru Tamaki
- Department of Physical Therapy, Nagoya Women's University, 3-40 Shioji-cho, Mizuho-Ku, Nagoya, Aichi, 467-8610, Japan.
- Department of Physical Therapy, Health Science University, 7187 Kodachi, Fujikawaguchiko-Town, Yamanashi, 401-0380, Japan.
| | - Ken Muramatsu
- Department of Physical Therapy, Kyorin University, 5-4-1 Simorenzyaku, Mitaka-City, Tokyo, 181-8612, Japan
| | - Masako Ikutomo
- Department of Physical Therapy, University of Tokyo Health Sciences, 4-11 Ochiai, Tama-City, Tokyo, 206-0003, Japan
| | - Junya Komagata
- Department of Physical Therapy, Nagoya Women's University, 3-40 Shioji-cho, Mizuho-Ku, Nagoya, Aichi, 467-8610, Japan
| |
Collapse
|
2
|
Goto-Inoue N, Morisasa M, Kimura K, Mori T, Furuichi Y, Manabe Y, Fujii NL. Mass spectrometry imaging reveals local metabolic changes in skeletal muscle due to chronic training. Biosci Biotechnol Biochem 2022; 86:730-738. [PMID: 35285857 DOI: 10.1093/bbb/zbac037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Accepted: 03/09/2022] [Indexed: 11/13/2022]
Abstract
Muscle atrophy is a major health problem that needs effective prevention and treatment approaches. Chronic exercise, an effective treatment strategy for atrophy, promotes muscle hypertrophy, which leads to dynamic metabolic changes; however, the metabolic changes vary among myofiber types. To investigate local metabolic changes due to chronic exercise, we utilized comprehensive proteome and mass spectrometry (MS) imaging analyses. Our training model exhibited hypertrophic features only in glycolytic myofibers. The proteome analyses demonstrated that exercise promoted anabolic pathways, such as protein synthesis, and significant changes in lipid metabolism, but not in glucose metabolism. Furthermore, the fundamental energy sources, glycogen, neutral lipids, and ATP, were sensitive to exercise, and the changes in these sources differed between glycolytic and oxidative myofibers. MS imaging revealed that the lipid composition differs among myofibers; arachidonic acid might be an effective target for promoting lipid metabolism during muscle hypertrophy in oxidative myofibers.
Collapse
Affiliation(s)
- Naoko Goto-Inoue
- Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, Japan
| | - Mizuki Morisasa
- Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, Japan
| | - Keisuke Kimura
- Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, Japan
| | - Tsukasa Mori
- Department of Marine Science and Resources, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, Japan
| | - Yasuro Furuichi
- Health Promotion Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa Hachioji, Tokyo, Japan
| | - Yasuko Manabe
- Health Promotion Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa Hachioji, Tokyo, Japan
| | - Nobuharu L Fujii
- Health Promotion Sciences, Tokyo Metropolitan University, 1-1 Minamiosawa Hachioji, Tokyo, Japan
| |
Collapse
|
3
|
Larson L, Lioy J, Johnson J, Medler S. Transitional Hybrid Skeletal Muscle Fibers in Rat Soleus Development. J Histochem Cytochem 2019; 67:891-900. [PMID: 31510854 PMCID: PMC6882066 DOI: 10.1369/0022155419876421] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 08/12/2019] [Indexed: 12/22/2022] Open
Abstract
Skeletal muscles comprise hundreds of individual muscle fibers, with each possessing specialized contractile properties. Skeletal muscles are recognized as being highly plastic, meaning that the physiological properties of single muscle fibers can change with appropriate use. During fiber type transitions, one myosin heavy chain isoform is exchanged for another and over time the fundamental nature of the fiber adapts to become a different fiber type. Within the rat triceps surae complex, the soleus muscle starts out as a muscle comprised of a mixture type IIA and type I fibers. As neonatal rats grow and mature, the soleus undergoes a near complete transition into a muscle with close to 100% type I fibers at maturity. We used immunohistochemistry and single fiber SDS-PAGE to track the transformation of type IIA into type I fibers. We found that transitioning fibers progressively incorporate new myofibrils containing type I myosin into existing type IIA fibers. During this exchange, distinct type I-containing myofibrils are segregated among IIA myofibrils. The individual myofibrils within existing muscle fibers thus appear to represent the functional unit that is exchanged during fiber type transitions that occur as part of normal muscle development.
Collapse
Affiliation(s)
- Lauren Larson
- Biology Department, State University of New York at Fredonia, Fredonia, NY, USA
| | - Jessica Lioy
- Biology Department, State University of New York at Fredonia, Fredonia, NY, USA
| | - Jordan Johnson
- Biology Department, State University of New York at Fredonia, Fredonia, NY, USA
| | - Scott Medler
- Biology Department, State University of New York at Fredonia, Fredonia, NY, USA
| |
Collapse
|
4
|
Medler S. Mixing it up: the biological significance of hybrid skeletal muscle fibers. ACTA ACUST UNITED AC 2019; 222:222/23/jeb200832. [PMID: 31784473 DOI: 10.1242/jeb.200832] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Skeletal muscle fibers are classified according to the myosin heavy chain (MHC) isoforms and other myofibrillar proteins expressed within these cells. In addition to 'pure' fibers expressing single MHC isoforms, many fibers are 'hybrids' that co-express two or more different isoforms of MHC or other myofibrillar proteins. Although hybrid fibers have been recognized by muscle biologists for more than three decades, uncertainty persists about their prevalence in normal muscles, their role in fiber-type transitions, and what they might tell us about fiber-type regulation at the cellular and molecular levels. This Review summarizes current knowledge on the relative abundance of hybrid fibers in a variety of muscles from different species. Data from more than 150 muscles from 39 species demonstrate that hybrid fibers are common, frequently representing 25% or more of the fibers in normal muscles. Hybrid fibers appear to have two main roles: (1) they function as intermediates during the fiber-type transitions associated with skeletal muscle development, adaptation to exercise and aging; and (2) they provide a functional continuum of fiber phenotypes, as they possess physiological properties that are intermediate to those of pure fiber types. One aspect of hybrid fibers that is not widely recognized is that fiber-type asymmetries - such as dramatic differences in the MHC composition along the length of single fibers - appear to be a common aspect of many fibers. The final section of this Review examines the possible role of differential activities of nuclei in different myonuclear domains in establishing fiber-type asymmetries.
Collapse
Affiliation(s)
- Scott Medler
- Biology Department, State University of New York at Fredonia, Fredonia, NY 14063, USA
| |
Collapse
|
5
|
Santana A, Debastiani JC, Kunz RI, Buratti P, Brancalhão RMC, de Fátima Chasko Ribeiro L, Torrejais MM, Bertolini GRF. Association of sericin and swimming on the phenotype, motor plate, and functionality of the denervated plantar muscle of Wistar rats. J Exerc Rehabil 2018; 14:24-31. [PMID: 29511649 PMCID: PMC5833964 DOI: 10.12965/jer.1835138.569] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 01/23/2018] [Indexed: 01/24/2023] Open
Abstract
Physical exercise may help maintain muscle properties and functional improvement after peripheral nerve lesion, which may be enhanced by using biocompatible substances, such as sericin. The aim of this study was analyse the effect of sericin associated with swimming exercise on the phenotype, innervation, and functionality of the plantar muscle of Wistar rats. Forty randomly divided adult rats were used in five groups of eight animals: control, injury, sericin, exercise, exercise and sericin. The application of sericin was done on the spot, 100 μL, shortly after nerve compression. Three days after sciatic nerve compression, the swimming and swimming and sericin groups were submitted to physical swimming exercise for 21 days. Afterwards, the animals were euthanised and the plantar muscle was dissected and submitted to histochemical and histoenzymological techniques. The grip strength test did not show alterations in muscular functionality, and the control presented greater muscle mass in relation to the other groups, the same did not occur for muscle length. Polymorphic neuromuscular junctions were detected in the groups, although without significant morphometric alterations of the area, major and minor diameters. The percentage of type I fibres was lower in the lesion group and there was no difference in fibres IIa and IIb between groups. The area of fibres I, IIa and IIb remained constant between groups. Sericin biopolymer combined with swimming exercise did not affect plantar muscle function, submitted to experimental axonotmosis, whose contractile properties were altered by nerve injury.
Collapse
Affiliation(s)
- André Santana
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Jean Carlos Debastiani
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Regina Inês Kunz
- Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | - Pamela Buratti
- Programa de Pós-Graduação em Biociências e Saúde da, Universidade Estadual do Oeste do Paraná (UNIOESTE), Cascavel, Brazil
| | | | | | | | | |
Collapse
|
6
|
da Rocha AL, Pereira BC, Teixeira GR, Pinto AP, Frantz FG, Elias LLK, Lira FS, Pauli JR, Cintra DE, Ropelle ER, de Moura LP, Mekary RA, de Freitas EC, da Silva ASR. Treadmill Slope Modulates Inflammation, Fiber Type Composition, Androgen, and Glucocorticoid Receptors in the Skeletal Muscle of Overtrained Mice. Front Immunol 2017; 8:1378. [PMID: 29163473 PMCID: PMC5669301 DOI: 10.3389/fimmu.2017.01378] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2017] [Accepted: 10/06/2017] [Indexed: 12/16/2022] Open
Abstract
Overtraining (OT) may be defined as an imbalance between excessive training and adequate recovery period. Recently, a downhill running-based overtraining (OTR/down) protocol induced the nonfunctional overreaching state, which is defined as a performance decrement that may be associated with psychological and hormonal disruptions and promoted intramuscular and systemic inflammation. To discriminate the eccentric contraction effects on interleukin 1beta (IL-1β), IL-6, IL-10, IL-15, and SOCS-3, we compared the release of these cytokines in OTR/down with other two OT protocols with the same external load (i.e., the product between training intensity and volume), but performed in uphill (OTR/up) and without inclination (OTR). Also, we evaluated the effects of these OT models on the muscle morphology and fiber type composition, serum levels of fatigue markers and corticosterone, as well as androgen receptor (AR) and glucocorticoid receptor (GR) expressions. For extensor digitorum longus (EDL), OTR/down and OTR groups increased the cytokines and exhibited micro-injuries with polymorphonuclear infiltration. While OTR/down group increased the cytokines in soleus muscle, OTR/up group only increased IL-6. All OT groups presented micro-injuries with polymorphonuclear infiltration. In serum, while OTR/down and OTR/up protocols increased IL-1β, IL-6, and tumor necrosis factor alpha, OTR group increased IL-1β, IL-6, IL-15, and corticosterone. The type II fibers in EDL and soleus, total and phosphorylated AR levels in soleus, and total GR levels in EDL and soleus were differentially modulated by the OT protocols. In summary, the proinflammatory cytokines were more sensitive for OTR/down than for OTR/up and OTR. Also, the specific treadmill inclination of each OT model influenced most of the other evaluated parameters.
Collapse
Affiliation(s)
- Alisson L da Rocha
- Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Bruno C Pereira
- Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Giovana R Teixeira
- Department of Physical Education, State University of São Paulo (UNESP), Presidente Prudente, Brazil
| | - Ana P Pinto
- Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Fabiani G Frantz
- Department of Clinical, Toxicological, and Bromatological Analysis, Faculty of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Lucila L K Elias
- Department of Physiology, Ribeirao Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Fábio S Lira
- Department of Physical Education, State University of São Paulo (UNESP), Presidente Prudente, Brazil
| | - José R Pauli
- Laboratory of Molecular Biology of Exercise (LaBMEx), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Dennys E Cintra
- Laboratory of Molecular Biology of Exercise (LaBMEx), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Eduardo R Ropelle
- Laboratory of Molecular Biology of Exercise (LaBMEx), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Leandro P de Moura
- Laboratory of Molecular Biology of Exercise (LaBMEx), School of Applied Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Rania A Mekary
- Department of Pharmaceutical Business and Administrative Sciences, MCPHS University, Boston, MA, United States.,Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, United States
| | - Ellen C de Freitas
- School of Physical Education and Sport of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Adelino S R da Silva
- Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil.,School of Physical Education and Sport of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, Brazil
| |
Collapse
|
7
|
Du Bois P, Pablo Tortola C, Lodka D, Kny M, Schmidt F, Song K, Schmidt S, Bassel-Duby R, Olson EN, Fielitz J. Angiotensin II Induces Skeletal Muscle Atrophy by Activating TFEB-Mediated MuRF1 Expression. Circ Res 2015; 117:424-36. [PMID: 26137861 DOI: 10.1161/circresaha.114.305393] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Accepted: 07/02/2015] [Indexed: 11/16/2022]
Abstract
RATIONALE Skeletal muscle wasting with accompanying cachexia is a life threatening complication in congestive heart failure. The molecular mechanisms are imperfectly understood, although an activated renin-angiotensin aldosterone system has been implicated. Angiotensin (Ang) II induces skeletal muscle atrophy in part by increased muscle-enriched E3 ubiquitin ligase muscle RING-finger-1 (MuRF1) expression, which may involve protein kinase D1 (PKD1). OBJECTIVE To elucidate the molecular mechanism of Ang II-induced skeletal muscle wasting. METHODS AND RESULTS A cDNA expression screen identified the lysosomal hydrolase-coordinating transcription factor EB (TFEB) as novel regulator of the human MuRF1 promoter. TFEB played a key role in regulating Ang II-induced skeletal muscle atrophy by transcriptional control of MuRF1 via conserved E-box elements. Inhibiting TFEB with small interfering RNA prevented Ang II-induced MuRF1 expression and atrophy. The histone deacetylase-5 (HDAC5), which was directly bound to and colocalized with TFEB, inhibited TFEB-induced MuRF1 expression. The inhibition of TFEB by HDAC5 was reversed by PKD1, which was associated with HDAC5 and mediated its nuclear export. Mice lacking PKD1 in skeletal myocytes were resistant to Ang II-induced muscle wasting. CONCLUSION We propose that elevated Ang II serum concentrations, as occur in patients with congestive heart failure, could activate the PKD1/HDAC5/TFEB/MuRF1 pathway to induce skeletal muscle wasting.
Collapse
Affiliation(s)
- Philipp Du Bois
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Cristina Pablo Tortola
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Doerte Lodka
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Melanie Kny
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Franziska Schmidt
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Kunhua Song
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Sibylle Schmidt
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Rhonda Bassel-Duby
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Eric N Olson
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.)
| | - Jens Fielitz
- From the Department of Molecular Cardiology, Experimental and Clinical Research Center (ECRC), a Cooperation between Max-Delbrück-Centrum and Charité Universitätsmedizin Berlin, Campus Buch, Berlin, Germany (P.D.B., C.P.T., D.L., M.K., F.S., S.S., J.F.); Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Virchow, Berlin, Germany (J.F.); and Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas (K.S., R.B.-D., E.N.O.).
| |
Collapse
|
8
|
Andreassen CS, Jensen JM, Jakobsen J, Ulhøj BP, Andersen H. Striated muscle fiber size, composition, and capillary density in diabetes in relation to neuropathy and muscle strength. J Diabetes 2014; 6:462-71. [PMID: 24397623 DOI: 10.1111/1753-0407.12124] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2013] [Revised: 12/16/2013] [Accepted: 01/05/2014] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE Diabetic polyneuropathy (DPN) leads to progressive loss of muscle strength in the lower extremities due to muscular atrophy. Changes in vascularization occur in diabetic striated muscle; however, the relationship between these changes and DPN is as yet unexplored. The aim of the present study was to evaluate histologic properties and capillarization of diabetic skeletal muscle in relation to DPN and muscle strength. METHODS Twenty type 1 and 20 type 2 diabetic (T1D and T2D, respectively) patients underwent biopsy of the gastrocnemic muscle, isokinetic dynamometry at the ankle, electrophysiological studies, clinical examination, and quantitative sensory examinations. Muscle biopsies were stained immunohistochemically and muscle fiber diameter, fiber type distribution, and capillary density determined. Twenty control subjects were also included in the study. RESULTS No relationship was found between muscle fiber diameter, muscle fiber type distribution, or capillary density and degree of neuropathy or muscle strength for either patient group. Muscle fiber diameter and the proportion of Type II fibers were greater for T1D patients than both T2D patients and controls. The T2D patients had fewer capillaries per muscle fiber than T1D patients and controls. CONCLUSIONS Striated muscle fiber size, muscle fiber distribution, and vascularization are unrelated to DPN and muscle strength in diabetes.
Collapse
Affiliation(s)
- Christer Swan Andreassen
- Clinical Neurology Research Group, Department of Neurology, Aarhus University Hospital, Aarhus, Denmark; Institute of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | | | | | | | | |
Collapse
|
9
|
Carvalho CCD, Maia JN, Lins OG, Moraes SRAD. Sensory nerve conduction in the caudal nerves of rats with diabetes. Acta Cir Bras 2011; 26:121-4. [DOI: 10.1590/s0102-86502011000200008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2010] [Accepted: 12/20/2010] [Indexed: 11/21/2022] Open
Abstract
PURPOSE: To investigate sensory nerve conduction of the caudal nerve in normal and diabetic rats. METHODS: Diabetes was induced in twenty 8-weeks old Wistar male rats. Twenty normal rats served as controls. Caudal nerve conduction studies were made before diabetes induction and the end of each week for six consecutive weeks. The caudal nerve was stimulated distally and nerve potentials were recorded proximally on the animal's tail using common "alligator" clips as surface electrodes. RESULTS: After induction, nerve conduction velocities (NCV) increased slower in the diabetic than in the control group. Sensory nerve action potentials (SNAP) conduction velocities increased slower in the diabetic than in the control group (slope of regression line: 0.5 vs 1.3m/s per week; NCV in the 15th week = 39±3m/s vs 44±4m/s). Tukey's tests showed differences between groups at the 11th, 13th and 15th weeks old. From the 10th week on, SNAP amplitudes increased faster in the diabetic than in the control group (slopes of the regression line: 10 vs 8µV per week; SNAP amplitudes in the 15th week: 107±23µV vs 85±13µV). Differences at the 12th, 13th and 15th weeks were significant. CONCLUSION: In diabetic rats nerve conduction velocities were slower whereas amplitudes were larger than in normal rats.
Collapse
|
10
|
Cunha RR, Cunha VNDC, Segundo PR, Moreira SR, Kokubun E, Campbell CSG, de Oliveira RJ, Simões HG. Determination of the lactate threshold and maximal blood lactate steady state intensity in aged rats. Cell Biochem Funct 2009; 27:351-7. [PMID: 19585487 DOI: 10.1002/cbf.1580] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The reliability of the lactate threshold (LT) determined in aged rats and its validity to identify an exercise intensity corresponding to the maximal blood lactate steady state (MLSS) were analyzed. Eighteen male aged Wistar rats (approximately 365 days) were submitted to two incremental swimming tests until exhaustion, consisting of an initial load corresponding to 1% of body mass (BM) and increments of 1% BM at each 3-min with blood lactate ([lac]) measurements. The LT was determined by visual inspection (LT(V)) as well by applying a polynomial function on the [lac]/workload ratio (LT(P)) by considering the vertices of the curve. For the MLSS, twelve animals were submitted, on different days, to 3-4 exercise sessions of 30-min with workload corresponding to 4, 5 or 6% BM. The MLSS was considered the highest exercise intensity at which the [lac] variation was not higher than 0.07 mM.min(-1) during the last 20-min. No differences were observed for the test-retest results (4.9 +/- 0.7 and 5.0 +/- 0.8 %BM for LTv; and 6.0 +/- 0.6 and 5.8 +/- 0.6 %BM for LTp) that did not differ from the MLSS (5.4 +/- 0.5 %BM). The LT identified for aged rats in swimming, both by visual inspection and polynomial function, was reliable and did not differ from the MLSS.
Collapse
Affiliation(s)
- Rafael Rodrigues Cunha
- Catholic University of Brasilia, Graduate Program on Physical Education and Health, Taguatinga, DF, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
11
|
Ahmadzadeh H, Andreyev D, Arriaga EA, Thompson LV. Capillary electrophoresis reveals changes in individual mitochondrial particles associated with skeletal muscle fiber type and age. J Gerontol A Biol Sci Med Sci 2007; 61:1211-8. [PMID: 17234813 DOI: 10.1093/gerona/61.12.1211] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Capillary electrophoresis (CE) with postcolumn laser-induced fluorescence detection (LIF) was used to analyze single skeletal muscle fibers from young and old rats. Due to selective labeling of mitochondria with 10-N-nonyl acridine orange, the zeptomole (10(-21) mole) sensitivity, and the high separation power, three properties of individual mitochondrial particles were revealed: the number, the distributions of cardiolipin, and their electrophoretic mobilities. Type I fibers had more mitochondrial particles and cardiolipin per particle than did type IIb fibers from rats of similar age. Individual fibers of the same fiber type from young rats contained more mitochondrial particles and cardiolipin per particle than did fibers from old rats. There were fiber type-specific and age-specific differences in the electrophoretic mobility of individual mitochondrial particles. The CE-LIF results of individual mitochondrial particles are the first of their kind in that they reveal fiber type-specific and age-specific differences that are not obviously noticed in bulk measurements of heterogeneous tissues.
Collapse
Affiliation(s)
- Hossein Ahmadzadeh
- Department of Chemistry, California State Polytechnic University, Pomona, CA, USA
| | | | | | | |
Collapse
|
12
|
Snow LM, Lynner CB, Nielsen EM, Neu HS, Thompson LV. Advanced Glycation End Product in Diabetic Rat Skeletal Muscle in vivo. Pathobiology 2007; 73:244-51. [PMID: 17314495 DOI: 10.1159/000098210] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2006] [Accepted: 10/12/2006] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Advanced glycation end products (AGEs) are implicated in the etiology of diabetic complications in the kidney, nerve and eye. Skeletal muscle contractile parameters have also been found to be altered in diabetes. Glycation has not been extensively studied in skeletal muscle, but AGE-modified proteins may influence contractility. OBJECTIVE AND METHODS The aim of this study was to use immunohistochemistry to identify distribution patterns of the AGE Nepsilon-(carboxymethyl)-lysine in plantaris muscle of diabetic rats. RESULTS Results revealed the presence of Nepsilon-(carboxymethyl)-lysine intracellularly and also at sites along the myofiber periphery. The number of myofibers immunolabeling for AGE in animals with diabetes was more than 4-fold greater than in control animals. Additionally, there was a greater proportion of slow + fast myosin heavy chain coexpression in the AGE-positive cells from diabetic animals than in AGE-positive fibers from control animals. No significant difference was present between cross-sectional areas of AGE-positive fibers and AGE-negative fibers within the respective experimental groups. CONCLUSIONS AGE accumulation is greater in skeletal muscle in vivo from diabetic animals than in control animals. This AGE accumulation appears to be associated with fiber-type transformation rather than with myofiber size. Further study is needed to determine the identity of these AGE-modified proteins and to determine how they influence skeletal muscle function in diabetes.
Collapse
Affiliation(s)
- LeAnn M Snow
- Department of Physical Medicine and Rehabilitation, University of Minnesota, Minneapolis, MN 55455, USA.
| | | | | | | | | |
Collapse
|
13
|
Lehti TM, Silvennoinen M, Kivelä R, Kainulainen H, Komulainen J. Effects of streptozotocin-induced diabetes and physical training on gene expression of titin-based stretch-sensing complexes in mouse striated muscle. Am J Physiol Endocrinol Metab 2007; 292:E533-42. [PMID: 17003243 DOI: 10.1152/ajpendo.00229.2006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In striated muscle, a sarcomeric noncontractile protein, titin, is proposed to form the backbone of the stress- and strain-sensing structures. We investigated the effects of diabetes, physical training, and their combination on the gene expression of proteins of putative titin stretch-sensing complexes in skeletal and cardiac muscle. Mice were divided into control (C), training (T), streptozotocin-induced diabetic (D), and diabetic training (DT) groups. Training groups performed for 1, 3, or 5 wk of endurance training on a motor-driven treadmill. Muscle samples from T and DT groups together with respective controls were collected 24 h after the last training session. Gene expression of calf muscles (soleus, gastrocnemius, and plantaris) and cardiac muscle were analyzed using microarray and quantitative PCR. Diabetes induced changes in mRNA expression of the proteins of titin stretch-sensing complexes in Z-disc (MLP, myostatin), I-band (CARP, Ankrd2), and M-line (titin kinase signaling). Training alleviated diabetes-induced changes in most affected mRNA levels in skeletal muscle but only one change in cardiac muscle. In conclusion, we showed diabetes-induced changes in mRNA levels of several fiber-type-biased proteins (MLP, myostatin, Ankrd2) in skeletal muscle. These results are consistent with previous observations of diabetes-induced atrophy leading to slower fiber type composition. The ability of exercise to alleviate diabetes-induced changes may indicate slower transition of fiber type.
Collapse
Affiliation(s)
- T Maarit Lehti
- LIKES Research Center for Sport and Health Sciences, Rautpohjankatu 8, Viveca, FIN-40700 Jyväskylä, Finland.
| | | | | | | | | |
Collapse
|
14
|
Bibliography. Current world literature. Vasculitis syndromes. Curr Opin Rheumatol 2006; 19:81-5. [PMID: 17143101 DOI: 10.1097/bor.0b013e32801437a8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|