Abstract
Syndecan-3 and syndecan-4 function as coreceptors for tyrosine kinases and in cell adhesion. Syndecan-3(-/-) mice exhibit a novel form of muscular dystrophy characterized by impaired locomotion, fibrosis, and hyperplasia of myonuclei and satellite cells. Explanted syndecan-3(-/-) satellite cells mislocalize MyoD, differentiate aberrantly, and exhibit a general increase in overall tyrosine phosphorylation. Following induced regeneration, the hyperplastic phenotype is recapitulated. While there are fewer apparent defects in syndecan-4(-/-) muscle, explanted satellite cells are deficient in activation, proliferation, MyoD expression, myotube fusion, and differentiation. Further, syndecan-4(-/-) satellite cells fail to reconstitute damaged muscle, suggesting a unique requirement for syndecan-4 in satellite cell function.
MeSH Terms
Animals
Cell Division/genetics
Cells, Cultured
Female
Gene Expression Regulation, Developmental
Membrane Glycoproteins/genetics,physiology
Mice
Mice, Mutant Strains
Muscle Development/physiology
Muscle Fibers, Skeletal/pathology,physiology
Muscle, Skeletal/growth & development,physiology
Muscular Dystrophies/genetics,physiopathology
MyoD Protein/metabolism
Proteoglycans/genetics,physiology
Regeneration/genetics
Satellite Cells, Skeletal Muscle/pathology
Syndecan-3
Syndecan-4
Chemicals
Membrane Glycoproteins
MyoD Protein
Proteoglycans
Sdc3 protein, mouse
Sdc4 protein, mouse
Syndecan-3
Syndecan-4
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Cornelison D D W
Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, Colorado 80309, USA.
Wilcox-Adelman Sarah A
Goetinck Paul F
Rauvala Heikki
Rapraeger Alan C
Olwin Bradley B
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