Competence of 1.ALPHA.,25-dihydroxyvitamin D3 receptor system in embryonic chick intestine.
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概要
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The competence of the duodenal 1α, 25-(OH)2-D3 receptor system in embryonic chicks was studied in the reconstituted cytosol-chromatin system. The sucrose density gradient centrifugation following incubation of duodenal cytosol with 1α, 25-dihydroxy-[3H]-vitamin D3 revealed that a cytosol 1α, 25-dihydroxyvitamin D3 receptor existed in the duodenum of 18-day-old embryos. In the duodenum of 14-day-old embryos, however, the cytosol 1α, 25-dihydroxyvitamin D3 receptor was not detected. In the reconstituted cytosol-chromatin system, duodenal cytosol of 18day-old embryos stimulated the association of 1α, 25-dihydroxy-[3H] vitamin D3 with chromatin of the vitamin D-deficient chick duodenum. The association of 1α, 25-dihydroxy-[3H]-vitamin D3 was shown to be saturable and temperature dependent. In a system where duodenal chromation of 18-day-old embryos was reconstituted with cytosols, 1α, 25-dihydroxy-[3H]-vitamin D3 was revealed to associate specifically with the chromatin in the presence of duodenal cytosol obtained from 18-day-old embryos or vitamin Ddeficient chicks. No significant association of 1α, 25-dihydroxy-[3H]vitamin D3 with duodenal chromatin of 18-day-old embryos occurred in the absence of duodenal cytosol. From these results, it was strongly suggested that the intestinal 1α, 25dihydroxyvitamin D3 receptor system in embryonic chicks has become competent for the intracellular transfer of 1α, 25-(OH)2-D3 before hatching.
- 財団法人 学会誌刊行センターの論文
著者
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細谷 憲政
Department of Nutrition, School of Health Sciences, Faculty of Medicine, University of Tokyo
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志村 二三夫
Department of Nutrition, School of Health Sciences, Faculty of Medicine, University of Tokyo
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奥 恒行
Department of Nutrition, School of Health Sciences, Faculty fo Medicine, University of Toktyo
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細谷 憲政
Department fo Nutrition, School of Health Sciences, Faculty of Medicine, University of Tokyo
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