The effect of respiratory muscle training with CO2 breathing on cellular adaptation of mdx mouse diaphragm.
The aim of our study was to investigate the cellular mechanisms induced by hypercapnic stimulation of ventilation, during 6 weeks/30 min per day, in 10 mdx and 8 C57BL10 mice (10+/-0.2 months old). Ten mdx and eight C57BL10 mice served as control group. This respiratory training increases in vitro maximal tetanic tension of the diaphragm only in mdx mice. Western blot analysis of diaphragm showed: (1) an over-expression of alpha-dystrobrevin in mdx and C57BL10 training group compared to control group (8100+/-710 versus 6100+/-520 and 2800+/-400 versus 2200+/-250 arbitrary units); (2) a decrease in utrophin expression only in mdx training group compared to control group (2100+/-320 versus 3100+/-125 arbitrary units). Daily respiratory muscle training in mdx mice, induces a beneficial effect on diaphragm strength, with an over-expression of alpha-dystrobrevin. Further studies are needed to determine if, in absence of dystrophin, the over-expression of alpha-dystrobrevin could be interpreted as a possible pathway to improve function of dystrophic muscle.
Matecki
Stefan
S
Laboratoire de Physiologie des Interactions, EA 701, Service Central de Physiologie Clinique, Hôpital Arnaud de Villeneuve, 34295 Montpellier Cedex 5, France. smatecki@aol.com
Rivier
François
F
Hugon
Gerald
G
Koechlin
Christelle
C
Michel
Alain
A
Prefaut
Christian
C
Mornet
Dominique
D
Ramonatxo
Michele
M
D000222:Adaptation, Physiological; D000818:Animals; D015153:Blotting, Western; D001835:Body Weight; D001945:Breathing Exercises; D002245:Carbon Dioxide / Q000494:pharmacology*; D002950:Citrate (si)-Synthase / Q000378:metabolism; D003964:Diaphragm / Q000166:cytology / Q000502:physiology*; D016189:Dystrophin / Q000378:metabolism; D049029:Dystrophin-Associated Proteins / Q000378:metabolism; D005260:Female; D006416:Hematoxylin; D006935:Hypercapnia / Q000503:physiopathology*; D006985:Hyperventilation / Q000503:physiopathology; D007537:Isometric Contraction / Q000502:physiology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018101:Mice, Inbred mdx; D018485:Muscle Fibers, Skeletal / Q000378:metabolism; D009137:Muscular Dystrophy, Animal / Q000503:physiopathology / Q000628:therapy*; D009929:Organ Size; D015656:Respiratory Mechanics / Q000502:physiology; D049411:Utrophin / Q000378:metabolism
D016189:Dystrophin; D049029:Dystrophin-Associated Proteins; D049411:Utrophin; C098885:dystrobrevin; D002245:Carbon Dioxide; D002950:Citrate (si)-Synthase; D006416:Hematoxylin