Author:
Mabuchi K.,Szvetko D.,Pinter K.,Sreter F. A.
Abstract
Long-term intermittent stimulation (10 Hz, 8 h/day, 7 wk) of the fast-twitch tibialis anterior results in a complete transformation of type IIB fibers to type IIA fibers. This is shown by the histochemical ATPase reaction and by a decrease in Ca2+-uptake ability by the sarcoplasmic reticulum. Furthermore, as shown by studies on bulk myosin and on single fibers, the LC1-to-LC3 light chain ratio is increased on sodium dodecylsulfate gel electrophoretograms, and there are changes in the myosin isozyme pattern manifested on pyrophosphate gels under nondissociating conditions. Thus the staining intensity of the slower moving putative LC1 homodimer band increases, and there is a difference in migration velocity between stimulated and unstimulated isozymes suggesting a possible difference in the heavy chain. This study underlines the importance of the stimulation schedule in determining whether a fast-to-slow transformation or a shift in subtype takes place.
Publisher
American Physiological Society
Cited by
83 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献