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In vitro bone resorption activity produced by a hypercalcemic adenocarcinoma tumor line (CAC-8) in nude mice

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Summary

Tumor extracts and conditioned tissue culture media from a canine adenocarcinoma tumor line (CAC-8) propagated in nude mice significantly increasedin vitro bone resorption in neonatal mouse calvaria as measured by release of previously incorporated45Ca.In vitro bone resorption activity was induced in a dose-dependent manner, was not suppressible by indomethacin, and was heat- and acid-stable. Gel exclusion chromatography demonstrated peak bone resorbing activity at a relative molecular mass of approximately 28,000. The parathyroid hormone (PTH) antagonist (8,18norleucine,34tyrosine) bovine PTH (3–34) amide did not inhibit CAC 8-stimulated or (1–34) bPTH-induced bone resorption. There was an increased number of tartrate-resistant, acid phosphatase-positive cells in calvariae exposed to CAC-8 extract. Ultrastructural evaluation of calvaria revealed hypertrophy and maturation of osteoclasts in calvaria exposed to CAC-8 extract. The maturation effects included close contact to bone surfaces and the presence of clear zones and ruffled borders in osteoclasts. Similar structures were observed infrequently in osteoclasts of control calvaria. These data demonstrate that the tumor line (CAC-8) contained activity capable of stimulatingin vitro bone resorption by increasing osteoclast numbers and the activity of existing osteoclasts.

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Rosol, T.J., Capen, C.C. & Minkin, C. In vitro bone resorption activity produced by a hypercalcemic adenocarcinoma tumor line (CAC-8) in nude mice. Calcif Tissue Int 39, 334–341 (1986). https://doi.org/10.1007/BF02555201

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  • DOI: https://doi.org/10.1007/BF02555201

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