1,25-Dihydroxyvitamin D3 enhances the growth of tumors in athymic mice inoculated with receptor rich osteosarcoma cells

Kanji Yamaoka, Samuel L. Marion, Alfred Gallegos, Mark R Haussler

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22 Scopus citations


We tested the influence of daily subcutaneous injections of 12.5 and 25 pmol of 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) on the growth of tumors arising from intracutaneous inoculations of athymic nude mice with rat osteogenic sarcoma cells (ROS) and human melanoma cells. Both doses of 1,25(OH)2D3 increased plasma calcium levels after 3 weeks and produced a striking enhancement in tumor weight when the mice received 1,25(OH)2D3 receptor-rich ROS17/2.8 cells. In contrast, 1,25(OH)2D3 caused no consistent effect on tumor weight in mice given G-361 melanoma cells with low receptor copy number or receptor deficient ROS 24/1 cells. Thus, 1,25(OH)2D3 stimulated tumor growth in a receptor dependent fashion, in vivo, instead of inhibiting it as predicted from the reduction of proliferation of cultured cells in the presence of 1,25(OH)2D3.

Original languageEnglish (US)
Pages (from-to)1292-1298
Number of pages7
JournalBiochemical and Biophysical Research Communications
Issue number3
Publication statusPublished - Sep 30 1986


ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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