Effect of transforming growth factor beta-1 on ovine satellite cell proliferation and fusion.
We have evaluated the effect of transforming growth factor beta-1 (TGF beta-1) on proliferation and fusion of cultured ovine satellite cells isolated from 5-month-old wether lambs. The isolation and culture protocols were validated by clonal analysis of the original cell preparation and assessment of proliferation and fusion of control cultures. Approximately 85% of the original cells isolated were myogenic as assessed by clonal analysis. The ovine cells doubled approximately every 18 hours during their exponential growth period and achieved a maximum percent fusion of 39.5% after 144 hours in culture. TGF beta-1 inhibited fusion of these cells in a dose-dependent manner with half-maximal inhibition occurring at .08 ng/ml. Maximal inhibition (95% suppression) occurred between .1 and .5 ng/ml. TGF Beta-1 (.05-3.0 ng/ml) did not inhibit proliferation of cultured ovine satellite cells in serum-containing medium or in serum-free defined medium. In contrast, TGF beta-1 did significantly suppress serum-stimulated proliferation of either porcine or bovine satellite cells that were isolated by using a procedure identical to that used to isolate the ovine satellite cells. Thus, proliferation of ovine satellite cells appears to respond differently to TGF beta-1 than does proliferation of either porcine or bovine satellite cells.
Hathaway
M R
MR
Department of Animal Science, University of Minnesota, St. Paul 55108.
Hembree
J R
JR
Pampusch
M S
MS
Dayton
W R
WR
D000818:Animals; D002417:Cattle; D002455:Cell Division / Q000187:drug effects; D002459:Cell Fusion / Q000187:drug effects; D002469:Cell Separation; D002478:Cells, Cultured; D003470:Culture Media / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D009132:Muscles / Q000166:cytology* / Q000187:drug effects; D012756:Sheep; D013552:Swine; D013997:Time Factors; D016212:Transforming Growth Factor beta / Q000494:pharmacology*
D003470:Culture Media; D016212:Transforming Growth Factor beta