Synthetic Studies of Vitamin D Analogeus. X. Synthesis and Biological Activities of 1.ALPHA.,25-Dihydroxy-21-norvitamin D3.
作者:Noboru KUBODERA、Katsuhito MIYAMOTO、Masahiko MATSUMOTO、Takehiko KAWANISHI、Hiroyuki OHKAWA、Takashi MORI
DOI:10.1248/cpb.40.648
日期:——
1α, 25-Dihydroxy-21-norvitamin D3 (3) was synthesized from 1α-hydroxydehydroepiandrosterone (4). Certain biological properties of 3 were examined in comparison with those of 1α, 25-dihydroxyvitamin D3 (1) and 1α, 25-dihydroxy-21-nor-20-oxavitamin D3 (2) to evaluate the effect of the 21-methyl substituent on biological activities. The differentiation-inducing activity of 3 towards human myeloid leukemia cells was approximately one-fifth of that of 1, while in the binding affinity with chick intestinal cytosolic receptor, 3 was about one-tenth of that of 1. The rather weak effect of 3 on serum calcium levels in normal mice at a dosage of 500μg/kg (intravenous administration) indicates that the essential importance of the 21-methyl moiety may lie in its effect on the regulation of calcium metabolism.
1α,25-二羟基-21-去甲维生素 D3(3)是由 1α-羟基去氢表雄酮(4)合成的。与 1α,25-二羟基维生素 D3(1)和 1α,25-二羟基-21-去甲-20-氧维生素 D3(2)相比,研究了 3 的某些生物特性,以评估 21-甲基取代基对生物活性的影响。3 对人类髓系白血病细胞的分化诱导活性约为 1 的五分之一,而与鸡肠细胞膜受体的结合亲和力约为 1 的十分之一。