Abstract
The heparan sulfate proteoglycan, glypican-1, is a low affinity receptor for fibroblast growth factor 2 (FGF2). Fibroblast growth factor 2 is a potent stimulator of skeletal muscle cell proliferation and an inhibitor of differentiation. Heparan sulfate proteoglycans like glypican-1 are required for FGF2 to transduce an intracellular signal. Understanding the role of glypican-1 in the regulation of FGF2-mediated signaling is important in furthering the understanding of the biological processes involved in muscle development and growth. In the current study, a turkey glypican-1 expression vector construct was transfected into turkey myogenic satellite cells resulting in the overexpression of glypican-1. The proliferation, differentiation, and responsiveness to FGF2 were measured in control and transfected cell cultures. The overexpression of glypican-1 in turkey myogenic satellite cells increased both satellite cell proliferation and FGF2 responsiveness, but decreased the rate of differentiation. The current data support glypican-1 modulation of both proliferation and differentiation through an FGF2-mediated pathway.
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