Insulin-like growth factor (IGF)-binding protein release by human fetal fibroblasts: dependency on cell density and IGF peptides.

Abstract

Insulin-like growth factors (IGFs) are bound to specific binding proteins in extracellular fluids in vivo and when released by cells in vitro. One class of binding protein (IGF-BP), a peptide of 26 kDa purified from amniotic fluid, has been shown to modulate IGF bioactivity on isolated human fibroblasts. We have determined the factors that control release… (More)

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