Correlation between the concentration of 1,25 alpha dihydroxyvitamin D3 receptors and growth inhibition, and differentiation of human osteosarcoma cells induced by vitamin D3

Tokuumi, Y.

Nihon Seikeigeka Gakkai Zasshi 69(4): 181-190

1995


ISSN/ISBN: 0021-5325
PMID: 7782656
Accession: 042688763

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Abstract
It has been previously reported that several human cancer cell lines possess specific receptors for 1,25-dihydroxyvitamin D3. In the present study, the concentration of the 1 alpha,25 dihydroxyvitamin D3 receptors has been determined in four human osteosarcoma cell lines--MG63, OST, MNNG-HOS, and KHOS-NP, and we report the effect of 1 alpha, 25 dihydroxyvitamin D3 on these cells. The concentration of 1 alpha, 25 dihydroxyvitamin D3 receptors in MG63, OST, MNNG-HOS and KHOS-NP was 31.1, 12.1, 5.9 and 3.0 fmol/mg of cytosol protein, respectively. These cell lines were classified into two groups according to the concentration of the receptors. The two receptor-rich cell lines were MG63 and OST, and the receptor-poor cell lines were MNNG-HOS and KHOS-NP. In a colony-forming assay, 1 alpha, 25 dihydroxyvitamin D3 (10(-8)M, 10(-9)M) was found to significantly suppress the growth of the receptor-rich cell lines (p < 0.01), but did not suppress that of the receptor-poor cell lines. In an antitumor assay, athymic mice received a transplantation of tumor cells and were treated with 2.5 nmol/kg of 1 alpha hydroxyvitamin D3. Then the relative mean weight of the tumor was measured (MG63 was, however, not transplantable into athymic mice.) As a result, 1 alpha hydroxyvitamin D3 was found to have significantly suppressed the relative mean tumor weight of OST and MNNG-HOS compared with a control group (p < 0.05), but did not suppress that of KHOS-NP. Histologically, 1 alpha hydroxyvitamin D3 induced marked chondrogenetic differentiation in OST alone.