Neurosteroid Analogues. 16. A New Explanation for the Lack of Anesthetic Effects of Δ<sup>16</sup>-Alphaxalone and Identification of a Δ<sup>17(20)</sup> Analogue with Potent Anesthetic Activity
作者:Eva Stastna、Kathiresan Krishnan、Brad D. Manion、Amanda Taylor、Nigam P. Rath、Zi-Wei Chen、Alex. S. Evers、Charles F. Zorumski、Steven Mennerick、Douglas F. Covey
DOI:10.1021/jm2002487
日期:2011.6.9
the presence of the C-21 methyl group in Δ16-alphaxalone, not the location of the constrained C-20 carbonyl group, that prevents Δ16-alphaxalone from interacting strongly with the GABAA receptor and having anesthetic activity. Consistent with this conclusion, a Δ17(20) analogue of Δ16-alphaxalone without a C-21 methyl group was found to be very similar to the anesthetic steroid (3α,5α)-3-hydroxypregnane-11
本研究提出了以下假设,即 (3α,5α)-3-hydroxypregn-16-ene-11,20-dione (Δ 16 -alphaxalone)缺乏麻醉活性是由限制类固醇 20的类固醇 Δ 16双键解释的-羰基到一个位置,防止它与γ-氨基丁酸A型(GABA A)受体有利地相互作用。制备了一系列Δ 16 -alphaxalone的 Δ 16和 Δ 17(20)类似物,以在结合、电生理和蝌蚪麻醉实验中评估这一假设。所得结果未能支持该假设。相反,结果表明,它是C-21甲基的Δ中存在16-alphaxalone,而不是受约束的 C-20 羰基的位置,它阻止 Δ 16 -alphaxalone 与 GABA A受体强烈相互作用并具有麻醉活性。与该结论一致,发现不含 C-21 甲基的 Δ 16 -alphaxalone的 Δ 17(20)类似物与麻醉类固醇 (3α,5α)-3-羟基孕烷-11,20-二酮非常相似(