Neurosteroid analogues. 15. A comparative study of the anesthetic and GABAergic actions of alphaxalone, Δ16-alphaxalone and their corresponding 17-carbonitrile analogues
作者:Achintya K. Bandyopadhyaya、Brad D. Manion、Ann Benz、Amanda Taylor、Nigam P. Rath、Alex S. Evers、Charles F. Zorumski、Steven Mennerick、Douglas F. Covey
DOI:10.1016/j.bmcl.2010.09.008
日期:2010.11
Alphaxalone, a neuroactive steroid containing a 17 beta-acetyl group, has potent anesthetic activity in humans. This pharmacological activity is attributed to this steroid's enhancement of gamma-amino butyric acid-mediated chloride currents at gamma-amino butyric acid type A receptors. The conversion of alphaxalone into Delta(16)-alphaxalone produces an analogue that lacks anesthetic activity in humans and that has greatly diminished receptor actions. By contrast, the corresponding 17 beta-carbonitrile analogue of alphaxalone and the Delta(16)-17-carbonitrile analogue both have potent anesthetic and receptor actions. The differential effect of the Delta(16)-double bond on the actions of alphaxalone and the 17 beta-carbonitrile analogue is accounted for by a differential effect on the orientation of the 17-acetyl and 17-carbonitrile substituents. (C) 2010 Elsevier Ltd. All rights reserved.