Effects of syndecan-1 and glypican on muscle cell proliferation and differentiation: implications for possible functions during myogenesis.
The heparan sulfate proteoglycans, syndecan-1 and glypican, are low-affinity receptors for fibroblast growth factor 2 (FGF2). Because FGF2 is a potent stimulator of skeletal muscle cell proliferation and a strong inhibitor of differentiation, it is likely that changes in syndecan-1 and glypican expression will affect myogenesis as both, in part, regulate FGF-dependent signaling. In the current study, expression vector constructs containing either syndecan-1 or glypican were transfected into turkey myogenic satellite cells resulting in the overexpression of these genes. The amount of expression of each of these genes was measured by semiquantitative reverse transcriptase polymerase chain reaction. The satellite cell cultures overexpressing syndecan-1 were unable to fuse to form multinucleated myotubes after differentiation was induced. The syndecan-1-transfected cells maintained a rounded morphology typical of cells during proliferation. In contrast, the satellite cells transfected with glypican formed larger myotubes. These results suggest that both syndecan-1 and glypican play pivotal, but different, roles in both muscle cell proliferation and differentiation.
Velleman
S G
SG
Department of Animal Sciences, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, Ohio 44691, USA. velleman.1@osu.edu
Liu
X
X
Coy
C S
CS
McFarland
D C
DC
D000818:Animals; D002454:Cell Differentiation / Q000502:physiology*; D002455:Cell Division / Q000502:physiology*; D002478:Cells, Cultured; D002645:Chickens; D016222:Fibroblast Growth Factor 2 / Q000502:physiology; D019812:Heparan Sulfate Proteoglycans / Q000235:genetics / Q000502:physiology*; D008562:Membrane Glycoproteins / Q000235:genetics / Q000502:physiology*; D051379:Mice; D018482:Muscle, Skeletal / Q000166:cytology* / Q000502:physiology; D011509:Proteoglycans / Q000235:genetics / Q000502:physiology*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction / Q000502:physiology; D053668:Syndecan-1; D053667:Syndecans; D014162:Transfection; D014422:Turkeys
D019812:Heparan Sulfate Proteoglycans; D008562:Membrane Glycoproteins; D011509:Proteoglycans; C508242:Sdc1 protein, mouse; D053668:Syndecan-1; D053667:Syndecans; D016222:Fibroblast Growth Factor 2