Impaired skeletal muscle repair after ischemia-reperfusion injury in mice.
Ischemia/reperfusion (IR) injury can induce skeletal muscle fibre death and subsequent regeneration. By 14 days, absolute and specific maximal forces and fatigue resistance in ischemic/reperfused soleus muscles were still reduced (-89%, -81%, and -75%, resp.) as compared to control muscles (P < .05). The decrease of these parameters in ischemic/reperfused muscle was much greater than that of myotoxic injured muscles (-12%, -11%, and -19%; P < .05). In addition, at 14 days ischemic/reperfused muscle structure was still abnormal, showing small muscle fibres expressing neonatal myosin heavy chain and large necrotic muscle fibres that were not observed in myotoxin treated muscles. By 56 days, in contrast to myotoxin treated muscles, specific maximal force and muscle weight of the ischemic/reperfused muscles did not fully recover (P < .05). This differential recovery between ischemic/reperfused and myotoxin treated muscles was not related to the differences in the initial cell death, loss of satellite cells after injury, expression of growth factors (IGF1, IGF2..), or capillary density in regenerating muscles. In conclusion, our results demonstrate that IR injury in mice induces long term detrimental effects in skeletal muscles and that the recovery following IR injury was delayed for yet unknown reasons as compared to myotoxic injury.
Vignaud
A
A
INSERM, U974, Paris 75013, France.
Hourde
C
C
Medja
F
F
Agbulut
O
O
Butler-Browne
G
G
Ferry
A
A
D000704:Analysis of Variance; D000818:Animals; D001696:Biomechanical Phenomena; D016923:Cell Death; D002460:Cell Line; D016207:Cytokines / Q000378:metabolism; D006614:Hindlimb / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D006651:Histocytochemistry; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000293:injuries / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology; D018995:Myosin Heavy Chains / Q000378:metabolism; D012038:Regeneration / Q000502:physiology*; D015427:Reperfusion Injury / Q000378:metabolism / Q000503:physiopathology
D016207:Cytokines; D018995:Myosin Heavy Chains
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