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Post-training estrogen enhances spatial and object memory consolidation in female mice.

Authors
  • Gresack, Jodi E
  • Frick, Karyn M
Type
Published Article
Journal
Pharmacology Biochemistry and Behavior
Publisher
Elsevier
Publication Date
May 01, 2006
Volume
84
Issue
1
Pages
112–119
Identifiers
PMID: 16759685
Source
Medline
License
Unknown

Abstract

The present study was designed to determine if post-training injections of a water-soluble form of 17beta-estradiol could enhance spatial and object memory consolidation in young female mice. Young ovariectomized female mice were trained in Morris water maze and object recognition tasks, injected with 0.1, 0.2, or 0.4 mg/kg cyclodextrin-encapsulated 17beta-estradiol or cyclodextrin-conjugated vehicle, and then re-tested after a delay. In the water maze, mice were trained in eight consecutive trials, injected, and memory for the platform location was re-tested after 24 h. All mice learned to find the platform on Day 1, but only mice receiving 0.2 mg/kg estradiol remembered the platform location on Day 2. In the object recognition task, mice were first presented with two identical objects, injected, and then presented with a familiar and novel object after a 24- or 48-h delay. For both delays, the 0.2 and 0.4 mg/kg doses enhanced memory for the familiar object. These data demonstrate that a 0.2 mg/kg dose of estradiol can enhance multiple types of memory consolidation in female mice, and suggest a narrower effective dose range for spatial memory than for object memory.

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