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Insulin-like growth factor binding protein-3 (IGFBP-3) inhibits cell growth. Previous reports have suggested the existence of plasma membrane IGFBP-3 receptors that could mediate direct, IGF-independent effects. Thus far, however, the only well-defined putative IGFBP-3 receptor is the type V transforming growth factor-beta (TGF-beta) receptor, a membrane glycoprotein that mediates TGF-beta-induced growth inhibition in selected cells. The aim of the study was to test whether IGFBP-3 and TGF-beta exert short-term effects in an osteosarcoma cell line that produces no IGF but contains type 1 IGF receptors.

european journal of endocrinology

Effects of IGF-I and -II, IGF binding protein-3 (IGFBP-3), and transforming growth factor-beta (TGF-beta) on growth and apoptosis of human osteosarcoma Saos-2/B-10 cells: lack of IGF-independent IGFBP-3 effects