The effect of autografting on the myosin composition in skeletal muscle fibers.
The purpose of the study was to investigate the changes in myosin heavy chain (MHC) and myosin light chain (MLC) isoforms following autotransplantation of extensor digitorum longus muscles. Muscles were grafted in "standard" and "nerve-intact" conditions. MHC and MLC isoforms were analyzed by sodium dodecyl sulphate gel electrophoresis. Changes in MHC isoforms 10, 30, and 60 days after grafting were similar in the "standard" and the "nerve-intact" grafts. In contrast to MHC, changes in MLC were different in the 10th day groups, but the same in the 30th day groups. Sixty days after grafting the content of MLC isoforms was the same as the control muscles. These data indicate that transient loss of functional innervation, even for a short time, has permanent effect on the composition of MHC but not MLC isoforms in regenerating skeletal muscle fibers.
Järva
J
J
Institute of Exercise Biology, University of Tartu, Chair of Functional Morphology, Estonia.
Alev
K
K
Seene
T
T
D000818:Animals; D005260:Female; D018482:Muscle, Skeletal / Q000637:transplantation*; D018995:Myosin Heavy Chains / Q000378:metabolism*; D018994:Myosin Light Chains / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D014182:Transplantation, Autologous / Q000502:physiology*
D018994:Myosin Light Chains; D018995:Myosin Heavy Chains