RT Journal Article
SR Electronic
T1 Response-Rate Suppression in Operant Paradigm as Predictor of Soporific Potency in Rats and Identification of Three Novel Sedative-Hypnotic Neuroactive Steroids
JF Journal of Pharmacology and Experimental Therapeutics
JO J Pharmacol Exp Ther
FD American Society for Pharmacology and Experimental Therapeutics
SP 1317
OP 1323
VO 291
IS 3
A1 Kimberly E. Vanover
A1 Dale M. Edgar
A1 Wesley F. Seidel
A1 Derk J. Hogenkamp
A1 David B. Fick
A1 Nancy C. Lan
A1 Kelvin W. Gee
A1 Richard B. Carter
YR 1999
UL http://jpet.aspetjournals.org/content/291/3/1317.abstract
AB Novel neuroactive steroids were evaluated for their effects on operant responding, rotorod motor performance, and electroencephalogram recording in rats. Co 134444, Co 177843, and Co 127501 were compared with the prototypical γ-aminobutyric acidA-positive allosteric modulators triazolam, zolpidem, pentobarbital, pregnanolone, and CCD 3693. Each of the compounds produced a dose-related decrease in response rates under a variable-interval 2-min schedule of positive reinforcement in an operant paradigm. In addition, all compounds produced a dose-related increase in ataxia and significant increases in nonrapid eye movement sleep in this experiment or have been previously reported to do so. Co 134444, Co 177843, and Co 127501 increased nonrapid eye movement sleep at doses that had no effect on rapid eye movement sleep. All of the compounds were more potent at decreasing operant responding than they were at increasing ataxia. Furthermore, the potency of compounds to produce response-rate suppression in an operant paradigm appeared to be a better predictor of soporific potency than did potency in the rotorod assay. The screening for sedative-hypnotic activity resulted in the identification of the novel orally active neuroactive steroids Co 134444, Co 177843, and Co 127501. The American Society for Pharmacology and Experimental Therapeutics