-one), the principal neurosteroid acting via γ-aminobutyric acid (GABA). These analogues were designed to study the structural requirements of the corresponding GABAA receptor. Their biological activity was measured by in vitro test with [3H]flunitrazepam as radioligand in which allopregnanolone and its active analogues stimulated the binding to the GABAA receptor. Analysis of the SAR data suggests
(25 R)-3β-羟基-5α-spirostan-12-one(hecogenin)和11α-hydroxypregn-4-ene-3,20-dione(11α-hydroxyprogesterone)被用作合成一系列5ξ-
孕烯醇酮的11位和12位取代衍
生物(3α-羟基-5α-pregnan-20-one和3α-羟基-5β-pregnan-20-one),主要的神经
固醇通过γ-
氨基
丁酸(
GABA)起作用。设计这些类似物以研究相应的
GABA A受体的结构要求。它们的
生物学活性通过[ 3 H]
氟硝西m作为放射性
配体的体外试验进行测量,其中Allopregnanolone及其活性类似物刺激与
GABA A的结合受体。
SAR数据的分析表明,
氟硝西binding的结合活性取决于C环边缘基团的疏
水-亲
水平衡,而不是它们与受体之间的特定相互作用。