Abstract
Skeletal muscle shows an enormous plasticity to adapt to stimuli such as contractile activity (endurance exercise, electrical stimulation, denervation), loading conditions (resistance training, microgravity), substrate supply (nutritional interventions) or environmental factors (hypoxia). The presented data show that adaptive structural events occur in both muscle fibres (myofibrils, mitochondria) and associated structures (motoneurons and capillaries). Functional adaptations appear to involve alterations in regulatory mechanisms (neuronal, endocrine and intracellular signalling), contractile properties and metabolic capacities. With the appropriate molecular techniques it has been demonstrated over the past 10 years that rapid changes in skeletal muscle mRNA expression occur with exercise in human and rodent species. Recently, gene expression profiling analysis has demonstrated that transcriptional adaptations in skeletal muscle due to changes in loading involve a broad range of genes and that mRNA changes often run parallel for genes in the same functional categories. These changes can be matched to the structural/functional adaptations known to occur with corresponding stimuli. Several signalling pathways involving cytoplasmic protein kinases and nuclear-encoded transcription factors are recognized as potential master regulators that transduce physiological stress into transcriptional adaptations of batteries of metabolic and contractile genes. Nuclear reprogramming is recognized as an important event in muscle plasticity and may be related to the adaptations in the myosin type, protein turnover, and the cytoplasma-to-myonucleus ratio. The accessibility of muscle tissue to biopsies in conjunction with the advent of high-throughput gene expression analysis technology points to skeletal muscle plasticity as a particularly useful paradigm for studying gene regulatory phenomena in humans.
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Abbreviations
- CLFS:
-
Chronic low-frequency electric stimulation
- CR:
-
Caloric restriction
- DE:
-
Detraining
- DV:
-
Denervation
- EE:
-
Endurance exercise
- ER:
-
Endurance runners
- I:
-
Immobilization
- IN:
-
Inactivity
- MG:
-
Real or simulated microgravity
- RT:
-
Resistance training
- WL:
-
Weightlifters
- βOX:
-
β-Oxidation
- DEL:
-
Deltoidus
- EC coupling:
-
Excitation-contraction coupling
- EDL:
-
Extensor digitorum longus
- Gls:
-
Glycolysis
- H+:
-
Reducing equivalents
- IMF mitochondria:
-
Interfibrillar mitochondria
- IMCL:
-
Intra-myocellular lipid
- KC:
-
Krebs cycle
- M:
-
Muscle
- NMJ:
-
Neuromuscular junction
- SR:
-
Sarcoplasmic reticulum
- S mitochondria:
-
Subsarcolemmal mitochondria
- Tn:
-
Troponin
- VL:
-
Vastus lateralis
- VO2max:
-
Maximal oxygen consumptioin
- ACTH:
-
Corticotropin
- AMPK:
-
5’-AMO-activated protein kinase
- ATP:
-
Adempsome 5’-triphosphate
- Ca2+:
-
Intracellular calcium
- CaMKII:
-
Ca2+/CaM kinase II
- Cor:
-
Cortisol
- EN:
-
Epinephrine
- ERK:
-
Extracellular signal-regulated kinase
- GH:
-
Growth hormone
- IGFBP-3:
-
Insulin-like growth factor binding protein 3
- IGF-I:
-
Insulin-like growth factor I
- JNK:
-
c-jun N-terminal kinase
- c-jun:
-
cellular counterpart of retroviral insert from avian sarcoma virus 17
- Ins:
-
Insulin
- lep:
-
Leptin
- MAPK:
-
Mitogen-activated (microtubule-associated) protein kinase
- NRF-1 and 2:
-
Nuclear respiratory factor 1 and 2
- p38:
-
p38 MAPK
- RE:
-
Renin
- ROS:
-
Reactive oxygen species
- T3:
-
Triiodothyronine
- T4:
-
Tetraiodothyronine
- Tes:
-
Testosterone
- TFAM:
-
Mitochondiral transcription factor
- TSH:
-
Thyroid stimulating hormone
- 3’UTR:
-
3’ Untranslated region
- 5’UTR:
-
5’ Untranslated region
- ACAA2:
-
3-ketoacyl-CoA thiolase
- ACC:
-
Acetyl-CoA carboxylase
- AIF1:
-
Allograft inflammatory factor 1
- AOX1:
-
Aldehyde oxidase
- ATP5A:
-
ATP synthase alpha chain
- ATP5C:
-
ATP synthase gamma chain
- ATP5G3:
-
ATP synthase lipid-binding protein
- ATP5J:
-
ATP synthase coupling factor 6
- ATPB:
-
ATP synthase beta chain
- Cat H:
-
Cathepsin H
- CDC16Hs:
-
Cell division cycle 16
- c-fos:
-
c-fos Proto-oncogene
- c-jun:
-
c-jun Protooncogene
- CK:
-
Creatine kinase
- Col:
-
Collagen type
- CPT I and II:
-
Carnitine O-palmitoyltransferases I and II
- COX:
-
Cytochrome C oxidase subunits
- CSF-1:
-
Colony stimulating factor
- CXCL5:
-
Small inducible cytokine B5
- CYP2A6:
-
Cytochrome P450 2A6
- CYP2B6:
-
Cytochrome P450 2B6
- CYP2C8:
-
Cytochrome P450 2C8
- CYPdb1:
-
Cytochrome P450 db1
- DDO:
-
d-aspartate oxidase
- DIA1:
-
NADH-cytochrome b5 reductase
- DNA:
-
Deoxyribonucleic acid
- DP5:
-
Neuronal death protein
- EGFR:
-
Epidermal growth factor receptor
- ERF:
-
Ets2 repressor factor
- FAP:
-
Fibroblast activation protein
- FAT/CD36:
-
Fatty acid translocase
- FBP2:
-
d-fructose-1,6-bisphosphate 1-phosphohydrolase
- FN:
-
Fibronectin
- Fum:
-
Fumarase
- gamma 1:
-
Interferon gamma treatment inducible mRNA
- glut-1:
-
Glucose transporter 1
- HIAP1:
-
Inhibitor of apoptosis protein 1
- HIF-1α:
-
Hypoxia-inducible factor 1 alpha
- HPARG:
-
Poly(ADP-ribose) glycohydrolase
- HPXEL:
-
Peroxisomal enoyl-CoA hydratase-like protein
- HSC:
-
Heat shock cognate
- HSP:
-
Heat shock protein
- HSP27 and 70:
-
Heat shock protein 27 and 70
- HSP2:
-
Heparan sulfate proteoglycan 2
- IL-1, -12 and -18:
-
Interleukin 1, 12 and 18
- IMPDH1:
-
Inosine-5’-monophosphate dehydrogenase 1
- LDH:
-
lactate dehydrogenase
- LIF:
-
Leukaemia inhibitory factor precursor
- LN:
-
Laminin
- LPL:
-
Lipoprotein lipase
- LRP1:
-
Low-density lipoprotein receptor-related protein 1
- LTC4S:
-
Human leucotriene C4 synthase
- Mac-2:
-
Macrophage subpopulation-specific antigen 2
- MARK3:
-
MAP/microtubule affinityregulating kinase 3 long
- MAT1:
-
CDK-activating kinase assembly factor
- MCAD:
-
Medium chain-specific acyl-CoA dehydrogenase
- MCT1, 2 and 4:
-
Monocarboxylate transporters 1, 2 and 4
- MHC:
-
Myosin heavy chain
- MHC10:
-
Nonmuscle type B myosin heavy chain (MYH10)
- MHC9:
-
Nonmuscle type A myosin heavy chain (MYH9)
- mRNA:
-
Messenger ribonucleic acid
- MSH3:
-
DNA mismatch repair protein
- MT1B:
-
Metallothionein-IB
- MT1F:
-
Metallothionein I F
- MEF2:
-
Myocyte enhancer factor 2
- myoD:
-
Myoblast determination protein
- MRF4:
-
Muscle regulatory factor 4
- myf 5 and 6:
-
Myogenic factors 5 and 6
- nAChR:
-
Nicotinic acetyl choline receptor
- NADH6:
-
Mitochondrially-encoded NADH dehydrogenase subunit
- NF-kappa B:
-
Nuclear factor kappa B
- NCAM1:
-
Neural cell adhesion molecule 1
- NDUFV1:
-
NADH-ubiquinone oxidoreductase 51 kDa subunit
- NDUFV2:
-
NADH-ubiquinone oxidoreductase 24 kDa subunit complex core protein 2
- NF-kB p65:
-
Nuclear factor kappa B p65 subunit
- NF-Y:
-
Nuclear factor Y protein subunit A
- NNT:
-
Mitochondrial NAD(P) transhydrogenase
- NRG-1:
-
Neuregulin
- ORP150:
-
150 kDa Oxygen-regulated protein
- p21:
-
Cyclin-dependent kinase inhibitor 1
- PON2:
-
Paraoxonase 2
- PDK4:
-
Pyruvate dehydrogenase kinase 4
- PP2Ag1:
-
Serine/threonine protein phosphatase 2A
- PPAR:
-
Peroxisome proliferator-activated receptor
- RANTES:
-
Regulated upon activation, normal T cell expressed and secreted
- RECQ2:
-
RecQ-like type 2 DNA helicase
- RNA:
-
Ribonucleic acid
- RYK:
-
Related to receptor tyrosine kinase
- SCHAD:
-
Short chain 3-hydroxyacyl-CoA dehydrogenase
- SDH:
-
Succinate dehydrogenase
- SH3GL3:
-
SH3-containing GRB2-like protein 3
- SOD2:
-
Manganese superoxide dismutase
- SVCT2:
-
Sodium-dependent vitamin C transporter
- tie 2:
-
Angiopoietin 1 receptor
- TRAP230:
-
Thyroid hormone receptor-associated protein complex component
- TSP4:
-
Thrombospondin 4
- UCP:
-
Mitochondrial uncoupling protein
- UQCRB:
-
Ubiquinol-cytochrome C reductase
- UQCRC2:
-
Ubiquinol-cytochrome C reductase
- UQCRH:
-
Ubiquinol-cytochrome C reductase complex 11 kDa protein
- VEGF:
-
Vascular endothelial growth factor
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Flück, M., Hoppeler, H. (2003). Molecular basis of skeletal muscle plasticity-from gene to form and function. In: Amara, S.G., et al. Reviews of Physiology, Biochemistry and Pharmacology. Reviews of Physiology, Biochemistry and Pharmacology, vol 146. Springer, Berlin, Heidelberg. https://doi.org/10.1007/s10254-002-0004-7
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