Related Experiment Videos
Insulinlike growth factor I: a potent mitogen for human osteogenic sarcoma
M N Pollak1, C Polychronakos, M Richard
1Department of Medicine, McGill University, Montreal, Canada.
Journal of the National Cancer Institute
|February 21, 1990
Summary
Human osteosarcoma cells possess insulin-like growth factor I (IGF-I) receptors. IGF-I stimulates osteosarcoma cell proliferation, suggesting potential therapeutic targets for this cancer.
Area of Science:
- Endocrinology
- Oncology
- Molecular Biology
Background:
- Insulin-like growth factor I (IGF-I) is crucial for skeletal growth.
- The role of IGF-I in skeletal neoplasms is not fully understood.
Purpose of the Study:
- To investigate if human osteosarcoma cells are sensitive to IGF-I.
- To identify IGF-I receptors in osteosarcoma cells.
Main Methods:
- Competitive-binding assays and affinity-labeling on cell membranes.
- Studied proliferation of MG-63 cells with and without IGF-I.
- Used a blocking antibody (alpha-IR3) against the IGF-I receptor.
Main Results:
- Specific IGF-I receptors were detected on osteosarcoma cell membranes.
- IGF-I potently stimulated MG-63 cell proliferation in vitro.
- The alpha-IR3 antibody dose-dependently inhibited IGF-I-stimulated proliferation.
Conclusions:
- Human osteogenic sarcomas may retain sensitivity to IGF-I.
- IGF-I signaling could be a therapeutic target for osteosarcoma.