The effect of pre-training infusions of estrogen receptor ligands in the CA1 region of hippocampus on passive avoidance task

Zohreh Sharifkhodaei; Zohreh Sharifkhodaei; Shahrbano Oryan

International Journal of Endocrinology and Metabolism

Research Institute for Endocrine Sciences

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The effect of pre-training infusions of estrogen receptor ligands in the CA1 region of hippocampus on passive avoidance task

Author(s):

Zohreh Sharifkhodaei^{1, 2},

Zohreh Sharifkhodaei^2,*,

Shahrbano Oryan^{1, 3}

1Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, IR Iran

2Department of Physiology and Pharmacology, Pasteur Institute of Iran, Tehran, IR Iran

3Department of Biology, College of Science, Tarbiat Moalem University, Tehran, IR Iran

International Journal of Endocrinology and Metabolism:Vol. 8, issue 2; 82-89

Published online:Apr 30, 2010

Article type:Research Article

Received:May 07, 2010

Accepted:Sep 04, 2010

How to Cite:Zohreh SharifkhodaeiZohreh SharifkhodaeiShahrbano OryanThe effect of pre-training infusions of estrogen receptor ligands in the CA1 region of hippocampus on passive avoidance task.Int J Endocrinol Metab.8(2):82-89.

Abstract

Background: Neurohormones like testosterone and estrogen play important roles in learning and memory. Estrogen receptors, densely expressed in the CA1 region of rat hippocampus, mediate the effects of estrogen on learning and memory. Estrogen receptors belong to a family of transcription factors, the nuclear receptor super family, and have two subtypes, estrogen receptor α and estrogen receptor β.
Objectives: Study the effect of pre-training infusions of estrogen receptor ligands in the CA1 region of hippocampus on passive avoidance task.
Materials and Methods: The current research has been conducted to assess the effects of estradiol valerat, estrogen receptor β selective agonist, diarylpropionitrile, non-steroidal selective estrogen receptor β modulator, and Cyclofenil on passive avoidance task on adult male rats. Male adult rats were bilaterally cannulated into the CA1 area of hippocampus, and then administered vehicle dimethyl sulfoxide or estradiol valerat (15 μg/0.5μl/side), diarylprop-ionitrile (0.2, 0.5, 1 μg/0.5μl/side), Cyclofenil (5, 7.5,10 μg/0.5μl/side), 30 min before training.
Results: Results showed that pre-training intra CA1 injections of EV (15 μg/0.5μl/side), diarylpropionitrile (0.5, 1 μg/0.5μl/side), and Cyclofenil (10 μg/0.5μl/side), significantly decreased step-through latencies and increased time spent in the dark chamber in inhibitory avoidance learning.
Conclusions: Our data suggest that estrogen receptor β plays has an important role in learning and memory acquisition in the inhibitory avoidance task.

Please cite this paper as:
Sharifkhodaei Z, Naghdi N, Oryan S. The effect of pre-training infusions of estrogen receptor ligands in the CA1 region of hippocampus on passive avoidance task. Int J Endocrinol Metab. 2010;8(2):82-89.

Keywords

Estrogen receptor beta

Estrogen valerat

Cyclofenil

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