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The effects of 1,25-dihydroxycholecalciferol(1,25-(OH)2-D3) injection into developing chick embryos on bone gamma-carboxyglutamic acid-containing protein (BGP) levels in bone and serum were observed in relation to those on calcium metabolism using chick embryos and chicks aged from 13 days' incubation to 7 days of age. Chick BGP was determined by radioimmunoassay using antiserum to purified chick BGP. The injection of 1,25-(OH)2-D3 into the developing chick embryos of 13 days' incubation resulted in the increases of bone BGP levels at hatching and at 2 days of age. However, the distribution of bone BGP at hatching was not influenced by 1,25-(OH)2-D3. On the other hand, serum BGP levels were significantly increased by 1,25-(OH)2-D3 at 14, 15, 18 days' incubation and at 2 days of age. The early changes of serum BGP levels after 1,25-(OH)2-D3 treatment were correlated with the increases of serum calcium concentrations and the decreases of inorganic phosphorus concentrations. These results suggest that 1,25-(OH)2-D3 may directly or indirectly mediate BGP synthesis or secretion associated with calcium metabolism.

journal of nutritional science and vitaminology

The effect of 1,25-dihydroxycholecalciferol on the changes of bone .GAMMA.-carboxyglutamic acid-containing protein in bone and serum of developing chick.