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The In ovo CAM-assay as a Xenograft Model for Sarcoma
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Clonal differences in prostaglandin synthesis among osteosarcoma cell lines.

S B Rodan1, G Wesolowski, G A Rodan

  • 1Merck, Sharp & Dohme Research laboratories, West Point, PA 19486.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|April 1, 1986
PubMed
Summary

Osteosarcoma cells that synthesize prostaglandin E2 (PGE2) differ from non-synthesizing cells in how they convert arachidonic acid. This difference in arachidonic acid metabolism is key to understanding varied PGE2 production in bone cancer cells.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Prostaglandin E2 (PGE2) plays a role in bone metabolism and cancer.
  • Osteosarcoma cell lines exhibit varying capacities for PGE2 synthesis.
  • Understanding arachidonic acid metabolism is crucial for elucidating PGE2 production pathways.

Purpose of the Study:

  • To compare the metabolism of [14C]-arachidonic acid in PGE2-synthesizing (ROS 17/2.8) versus non-synthesizing (ROS 25/1) osteosarcoma cell lines.
  • To investigate the factors influencing arachidonic acid conversion to PGE2 in these cell lines.

Main Methods:

  • Incubation of osteosarcoma cell lines with [14C]-arachidonic acid.
  • Analysis of radiolabeled arachidonic acid distribution in cellular lipids (phospholipids, triacylglycerols).

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  • Assessment of arachidonic acid release and conversion to PGE2 using calcium ionophore A23187 and various bone resorbing agents.

    • Main Results:

    • High uptake (>90%) of [14C]-arachidonic acid occurred in both cell lines within 24 hours, primarily incorporated into phospholipids.
    • Calcium ionophore A23187 stimulated [14C]-arachidonic acid release from phospholipids in PGE2-synthesizing cells but not in non-synthesizing cells.
    • PGE2-synthesizing cells converted released and exogenous arachidonic acid into PGE2, with synthesis dependent on arachidonic acid concentration; thrombin and rabbit serum stimulated PGE2 production.

    Conclusions:

    • The primary difference in PGE2 production between osteoblastic and non-osteoblastic osteosarcoma cells lies in their capacity to convert arachidonic acid to PGE2.
    • Specific cellular mechanisms govern the release and subsequent conversion of arachidonic acid into PGE2, influenced by cell type and external stimuli.