Muscle satellite cells
- PMID: 12757751
- DOI: 10.1016/s1357-2725(03)00042-6
Muscle satellite cells
Abstract
Skeletal muscle satellite cells are quiescent mononucleated myogenic cells, located between the sarcolemma and basement membrane of terminally-differentiated muscle fibres. These are normally quiescent in adult muscle, but act as a reserve population of cells, able to proliferate in response to injury and give rise to regenerated muscle and to more satellite cells. The recent discovery of a number of markers expressed by satellite cells has provided evidence that satellite cells, which had long been presumed to be a homogeneous population of muscle stem cells, may not be equivalent. It is possible that a sub-population of satellite cells may be derived from a more primitive stem cell. Satellite cell-derived muscle precursor cells may be used to repair and regenerate damaged or myopathic skeletal muscle, or to act as vectors for gene therapy. CELL FACTS: (1) Number of cells in body: 2 x 10(7) to 3 x 10(7) myonuclei/g, 20-25 kg muscle in average man; 2 x 10(5) to 10 x 10(5) satellite cells/g, i.e. approximately 1 x 10(10) to 2 x 10(10) satellite cells per person. (2) Main functions: repair and maintenance of skeletal muscle. (3) Turnover rate: close to zero in non-traumatic conditions-high in disease or severe trauma.
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