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Updated: Jul 29, 2026

Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
Published on: April 12, 2019
Mitogenic and antiapoptotic effects of insulin-like growth factor binding protein-6 in the human osteoblastic
C Schmid1, C Keller, M Gosteli-Peter
1Division of Endocrinology and Diabetes, Department of Internal Medicine, University Hospital, Rämistrasse 100, Zürich, CH-8091, Switzerland.
Abstract:
Insulin-like growth factor (IGF) I is a potent mitogen for human osteosarcoma cells such as the Saos-2/B-10 cell line. IGF binding proteins (IGFBPs) prevent stimulation of DNA synthesis by IGFs. In contrast to recombinant human (rh) IGFBP-2, -3, -4, and -5, 10-100 nM rhIGFBP-6 stimulated [(3)H]thymidine incorporation into DNA and multiplication of Saos-2/B-10 cells. Upon withdrawal of serum, 30 nM IGFBP-6 also decreased apoptosis (within 4 h) and increased protein content and sodium-dependent phosphate uptake (within 24 h), but less potently than IGF I. (125)I-labeled rhIGFBP-6 did not bind to the cells, and cold IGFBP-6 did not affect (125)I-labeled IGF I binding. Production of IGF I, IGF II, and IGFBP-6 by the cells or significant degradation of rhIGFBP-6 could not be detected within 24 h of incubation. Thus, among the rhIGFBPs tested, rhIGFBP-6 is unique in stimulating osteosarcoma cell growth. Furthermore, it has an antiapoptotic effect.
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