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维生素D(V.D)的主要功能是维持机体钙磷代谢平衡,作用的活性形式是1,25—二羟胆钙化酶(l,25—[OH]_2D_3)及24,25—二羟胆钙化醇(24,25—(OH)_2D_3)。其促肠道钙吸收的机理类似于类固醇激素的作用原理。 已经证实,甲状旁腺、肾、骨细胞存在1,25—(OH)_2D_3受体,可接受其作用。近年来,作者用放射免疫法测定小鸡骨、肾、肠和胰脏中的钙结合蛋白(CaBP),意外地发现胰脏也存在CaBP及
The main function of vitamin D (VD) is to maintain the body’s balance of calcium and phosphorus metabolism, the active form of 1,25-dihydroxycholecalciferol (l, 25- [OH] _2D_3) and 24,25-dihydroxycholecalciferol (24,25- (OH) _2D_3). Its mechanism of intestinal absorption of calcium is similar to the principle of steroid hormone. It has been confirmed that parathyroid, kidney, bone cells present 1,25- (OH) _2D_3 receptor, can accept its role. In recent years, the authors used radioimmunoassay to determine the calcium binding protein (CaBP) in chicken bone, kidney, intestine and pancreas. Surprisingly, it was found that there are also CaBP