c-MET regulates myoblast motility and myocyte fusion during adult skeletal muscle regeneration

Adult muscle stem cells, satellite cells (SCs), endow skeletal muscle with tremendous regenerative capacity. Upon injury, SCs activate, proliferate, and migrate as myoblasts to the injury site where they become myocytes that fuse to form new muscle. How migration is regulated, though, remains largel...

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Veröffentlicht in:PloS one 2013-11, Vol.8 (11), p.e81757-e81757
Hauptverfasser: Webster, Micah T, Fan, Chen-Ming
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description Adult muscle stem cells, satellite cells (SCs), endow skeletal muscle with tremendous regenerative capacity. Upon injury, SCs activate, proliferate, and migrate as myoblasts to the injury site where they become myocytes that fuse to form new muscle. How migration is regulated, though, remains largely unknown. Additionally, how migration and fusion, which both require dynamic rearrangement of the cytoskeleton, might be related is not well understood. c-MET, a receptor tyrosine kinase, is required for myogenic precursor cell migration into the limb for muscle development during embryogenesis. Using a genetic system to eliminate c-MET function specifically in adult mouse SCs, we found that c-MET was required for muscle regeneration in response to acute muscle injury. c-MET mutant myoblasts were defective in lamellipodia formation, had shorter ranges of migration, and migrated slower compared to control myoblasts. Surprisingly, c-MET was also required for efficient myocyte fusion, implicating c-MET in dual functions of regulating myoblast migration and myocyte fusion.
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subjects Adult Stem Cells - cytology
Adult Stem Cells - metabolism
Animals
c-Met protein
Cell adhesion & migration
Cell Differentiation
Cell Fusion
Cell migration
Cell Movement
Cells (biology)
Cytoskeleton
Cytoskeleton - chemistry
Cytoskeleton - metabolism
Defects
Embryo, Mammalian
Embryogenesis
Embryology
Embryonic development
Embryonic Development - genetics
Embryonic growth stage
Female
Gene Expression
Growth factors
Injuries
Kinases
Lamellipodia
Male
Mice
Mice, Transgenic
Muscle Cells - cytology
Muscle Cells - metabolism
Muscle, Skeletal - injuries
Muscle, Skeletal - metabolism
Muscle, Skeletal - pathology
Muscles
Musculoskeletal system
Mutation
Myoblasts
Myoblasts, Skeletal - cytology
Myoblasts, Skeletal - metabolism
Myocytes
Nitric oxide
Phosphorylation
Protein-tyrosine kinase receptors
Proteins
Proto-Oncogene Proteins c-met - genetics
Proto-Oncogene Proteins c-met - metabolism
Pseudopodia
Pseudopodia - metabolism
Regeneration
Regeneration - genetics
Rodents
Satellite cells
Skeletal muscle
Stem cell transplantation
Stem cells
Tyrosine
title c-MET regulates myoblast motility and myocyte fusion during adult skeletal muscle regeneration
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