Authors: Aparna Shah Alan Frazer
Publish Date: 2014/03/04
Volume: 231, Issue: 18, Pages: 3685-3694
Abstract
In the first study the effect of acute administration of estrogen and progesterone on the antidepressantlike effects of desipramine DMI a selective norepinephrine reuptake inhibitor SNRI was investigated in the forced swimming test FST In the second study the effect of chronic administration of these hormones on the effects of chronically administered DMI was investigatedIn the acute study the hormones blocked the effects of DMI in the FST as demonstrated by the absence of either a reduction in immobility or an increase in climbing behavior in animals treated with DMI in combination with the hormones Concentrationresponse experiments on hippocampal synaptosomes revealed no changes in the Km or Bmax for uptake of 3HNE in hormonetreated rats In the chronic study the antidepressantlike effects of DMI in the FST were not blocked by chronic administration of hormones Interestingly the hormones affected the serum concentrations of DMI These levels were significantly higher in animals receiving 10 or 15 mg/kg/day in hormonetreated rats as compared to those with placeboAcute administration of hormones blocked the effects of DMI given three times over 24 h in the FST However chronic administration of these hormones failed to block the effects of chronically administered DMI at a dose that produces clinically relevant serum concentrations
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