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Related Experiment Videos

New bone resorption stimulation factor elaborated by a human osteosarcoma cell line.

G Eilon, C Trummel, B Kream

    Cancer Research
    |January 1, 1984
    PubMed
    Summary

    A novel factor from human osteosarcoma cells stimulates bone resorption by increasing osteoclasts and decreasing bone matrix. This protein, distinct from known bone-active agents, may mimic physiological bone cell factors.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Oncology

    Background:

    • The FM-2 cell line, derived from human osteosarcoma, produces factors influencing bone metabolism.
    • Understanding these factors is crucial for deciphering bone remodeling processes and potential therapeutic targets.

    Purpose of the Study:

    • To characterize a novel bone-resorbing factor secreted by the FM-2 cell line.
    • To investigate its biological activity, molecular properties, and potential physiological relevance.

    Main Methods:

    • Utilized fetal rat bone organ cultures to assess calcium mobilization and bone matrix changes.
    • Employed gel filtration for molecular weight determination and hydroxylapatite chromatography for purification.
    • Tested inhibition by calcitonin and compared activity against known bone-active factors (PTH, vitamin D metabolites, PGE, EGF, OAF).

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  • Assessed effects on collagen synthesis and alkaline phosphatase in relevant cell lines.

    • Main Results:

    • FM-2 conditioned medium stimulated calcium mobilization and increased osteoclast numbers while decreasing bone matrix in fetal rat bones.
    • The active factor has a molecular weight of approximately 29,000 Da, is protein-dependent, and inhibited by calcitonin.
    • The factor's synthesis is regulated by cell density and medium replenishment.
    • It was differentiated from PTH, vitamin D metabolites, PGE, EGF, and OAF.
    • FM-2 medium also inhibited collagen synthesis and decreased alkaline phosphatase, with these activities co-eluting with the calcium-mobilizing factor.

    Conclusions:

    • The FM-2 cell line secretes a novel, calcitonin-sensitive, proteinaceous factor that stimulates bone resorption.
    • This factor exhibits distinct properties from known bone-active agents and may represent a physiological mediator.
    • The findings suggest potential roles for tumor-derived factors in understanding normal bone cell function.