title: Heparan sulfate proteoglycans, syndecan-4 and glypican-1, differentially regulate myogenic regulatory transcription factors and paired box 7 expression during turkey satellite cell myogenesis: implications for muscle growth.
abstract: The heparan sulfate proteoglycans have been shown to play essential roles in the proliferation and differentiation of myogenic satellite cells. Myogenic regulatory factors (MRF) and paired box 7 (Pax7) are essential transcription factors for satellite cell myogenesis. The objective of the current study was to investigate whether the expression of the MRF and Pax7 is, in part, regulated by the heparan sulfate proteoglycans, syndecan-4, and glypican-1, whose expression has been shown to differentially affect satellite cell proliferation and differentiation. To test this objective, small interfering RNA was used to knockdown the gene expression of glypican-1 and syndecan-4. The effect on the expression of MRF and Pax7 was measured at the mRNA level by real-time quantitative PCR. The knockdown of the glypican-1 gene decreased mRNA expression of MyoD, myogenin, MRF4, and Pax7 expression during proliferation and differentiation of turkey satellite cells; whereas knockdown of the syndecan-4 gene increased mRNA expression of MyoD and MRF4 expression during cell proliferation but not during differentiation and had no effect on myogenin and Pax7 expression. These data suggested that the precise expression of the MRF are dependent upon the appropriate expression of glypican-1 and syndecan-4 during satellite cell proliferation and differentiation, and Pax7 expression is influenced by glypican-1.
authors.affiliation: Department of Animal Sciences, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, 44691, USA.
authors.forename: J
authors.initials: J
authors.lastname: Shin
authors.forename: D C
authors.initials: DC
authors.lastname: McFarland
authors.forename: S G
authors.initials: SG
authors.lastname: Velleman
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D049109:Cell Proliferation; D002478:Cells, Cultured; D055785:Gene Knockdown Techniques / Q000662:veterinary; D053673:Glypicans / Q000378:metabolism*; D008297:Male; D024510:Muscle Development; D017570:MyoD Protein / Q000378:metabolism; D018006:Myogenic Regulatory Factors / Q000378:metabolism*; D018008:Myogenin / Q000378:metabolism; D051763:PAX7 Transcription Factor / Q000378:metabolism*; D034622:RNA Interference; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D032496:Satellite Cells, Skeletal Muscle / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D053671:Syndecan-4 / Q000378:metabolism*; D014162:Transfection / Q000662:veterinary; D014422:Turkeys / Q000235:genetics / Q000378:metabolism*
chemical_list: D053673:Glypicans; D017570:MyoD Protein; D018006:Myogenic Regulatory Factors; D018008:Myogenin; D051763:PAX7 Transcription Factor; D053671:Syndecan-4; C063403:myogenic factor 6