Biological activity assessment of the vitamin D metabolites 1,25-dihydroxy-24-oxo-vitamin D3 and 1,23,25-trihydroxy-24-oxo-vitamin D3.
Biological activity assessment of the vitamin D metabolites 1,25-dihydroxy-24-oxo-vitamin D3 and 1,23,25-trihydroxy-24-oxo-vitamin D3.
复制标题
维生素 D 代谢物 1,25-二羟基-24-氧代-维生素 D3 和 1,23,25-三羟基-24-氧代-维生素 D3 的生物活性评估。
DOI:
10.1016/0003-9861(83)90254-0
复制
发表时间:
1983
影响因子:
3.9
通讯作者:
Norman,AW
中科院分区:
文献类型:
--
作者:
Mayer,E;Bishop,JE;Ohnuma,N;Norman,AW
Two new metabolites of 1,25-dihydroxyvitamin D3[1,25(OH)2D3], namely 1,25(OH)2-24-oxo-vitamin D3and 1,23,25(OH)3-24-oxo-vitamin D3, have been preparedin vitrousing chick intestinal mucosal homogenates. To investigate the binding of 1,25(OH)2-[23-3H]-24-oxo-D3and 1,23,25(OH)3-[23-3H]-24-oxo-D3to the chick intestinal receptor we have isolated both metabolites in radioactive form using an incubation system containing 1,25(OH)2-[23,24-3H]-D3with a specific radioactivity of 5.6 Ci/mmol. Both metabolites were highly purified by using Sephadex LH-20 chromatography followed by high-pressure liquid chromatography (HPLC). Sucrose density gradient sedimentation analysis showed specific binding of both tritium-labeled metabolites to the chick intestinal cytosol receptor. Experiments were carried out to determine the relative effectiveness of binding to the chick intestinal mucosa receptor for 1,25(OH)2D3. The results are expressed as relative competitive index (RCI), where the RCI is defined as 100 for 1,25(OH)2D3. Whereas the RCI obtained for 1,25(OH)2-24-oxo-D3was 98 ± 2 (SE), the RCI for 1,23,25(OH)3-24-oxo-D3was only 28 ± 6 (SE). Also, the biological activity of both new metabolites was assessedin vivoin the chick. In our assay for intestinal calcium absorption, 1,25(OH)2-24-oxo-D3was active at a dose level of 1.63 and 4.88 nmol/bird (at 14 h), whereas 1,23,25(OH)3-24-oxo-D3showed only weak biological activity in this system. In our assay for bone calcium mobilization, administration of both new metabolites showed modest activity at the 4.88-nmol dose level, which was reduced at the 1.63-nmol dose level. The results indicate that biological activity declines as 1,25(OH)2D3is metabolized to 1,24R,25(OH)3D3) 1,25(OH)2-24-oxo-D3, and then 1,23,25(OH)3-24-oxo-D3.
登录
查看更多内容
影响因子:
3.9
作者:
Ohnuma,N;Bannai,K;Yamaguchi,H;Hashimoto,Y;Norman,AW
通讯作者:
Norman,AW
DOI:
10.1016/0022-4731(81)90269-7
发表时间:
1981
期刊:
Journal of steroid biochemistry
影响因子:
--
作者:
Mayer,E;Kadowaki,S;Okamura,WH;Ohnuma,N;Leyes,GA;Schmidt-Gayk,H;Norman,AW
通讯作者:
Norman,AW
DOI:
--
发表时间:
1972
期刊:
Journal of NutriLife
影响因子:
--
作者:
A. Norman;R. G. Wong
通讯作者:
R. G. Wong
影响因子:
4.8
作者:
H. Tsai;A. Norman
通讯作者:
A. Norman
影响因子:
2.9
作者:
R. Esvelt;H. Schnoes;H. DeLuca
通讯作者:
H. DeLuca