Historical Perspectives: plasticity of mammalian skeletal muscle
- PMID: 11181628
- DOI: 10.1152/jappl.2001.90.3.1119
Historical Perspectives: plasticity of mammalian skeletal muscle
Abstract
More than 40 years ago, the nerve cross-union experiment of Buller, Eccles, and Eccles provided compelling evidence for the essential role of innervation in determining the properties of mammalian skeletal muscle fibers. Moreover, this experiment revealed that terminally differentiated muscle fibers are not inalterable but are highly versatile entities capable of changing their phenotype from fast to slow or slow to fast. With the use of various experimental models, numerous studies have since confirmed and extended the notion of muscle plasticity. Together, these studies demonstrated that motoneuron-specific impulse patterns, neuromuscular activity, and mechanical loading play important roles in both the maintenance and transition of muscle fiber phenotypes. Depending on the type, intensity, and duration of changes in any of these factors, muscle fibers adjust their phenotype to meet the altered functional demands. Fiber-type transitions resulting from multiple qualitative and quantitative changes in gene expression occur sequentially in a regular order within a spectrum of pure and hybrid fiber types.
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