Biological activity of 24,24-difluoro-1 alpha, 25-dihydroxyvitamin D3 and 1 alpha, 25-dihydroxyvitamin D3-26,23-lactone in inducing differentiation of human myeloid leukemia cells |
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Authors: | Y Shiina E Abe C Miyaura H Tanaka S Yamada M Ohmori K Nakayama H Takayama I Matsunaga Y Nishii H F DeLuca T Suda |
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Affiliation: | 4. Department of Biochemistry, School of Dentistry, Showa University, 158 Hatanodai, Shinagawa-ku, Tokyo 142 Japan;1. Faculty of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa 199-01 Japan;2. Research Laboratories of Chugai Pharmaceutical Company Ltd., Takada, Toshima-ku, Tokyo 171, Japan;3. Department of Biochemistry, University of Wisconsin, Madison, Wisconsin 53706 U.S.A. |
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Abstract: | Vitamin D compounds added to the culture medium induce differentiation of human myeloid leukemia cells (HL-60 cells) by binding to a specific cytosol receptor protein. This system provides a biologically relevant and technically simple assay to examine the relationship between molecular structure and biological activity of vitamin D compounds. Using this culture system, the biological activity of 24,24-F2-1 alpha,25(OH)2D3 and 1 alpha,25(OH)2D3-26,23-lactone was assayed. 24,24-F2-1 alpha,25(OH)2D3 was four to seven times more potent than 1 alpha,25(OH)2D3 in inducing phagocytosis and C3 rosette formation of HL-60 cells, though both compounds bound equally well to the cytosol receptor, suggesting that the defuorination at the 24-carbon position may stimulate membrane permeability of the compound. 1 alpha,25(OH)2D3-26,23-lactone, on the other hand, was only 1/200th as active as 1 alpha,25(OH)2D3. The binding affinity of the lactone for the cytosol receptor was identical with that of 1 alpha (OH)D3, suggesting that the lactone formation between the 26 and 23 positions masks the function of the 25-hydroxyl group. The binding affinity of vitamin D3 derivatives to the specific cytosol receptor of HL-60 cells was well correlated with that of intestinal cytosol protein specifically bound to 1 alpha,25(OH)2D3. |
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Keywords: | Author to whom all correspondence should be addressed: Department of Biochemistry School of Dentistry Showa University 158 Hatanodai Shinagawa-ku Tokyo 142 Japan. |
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