Quinlan, Matthew G. and Hussain, Dema and Brake, Wayne G. (2008) Use of Cognitive Strategies in Rats: the Role of Estradiol and its Interaction with Dopamine. Hormones and Behavior , 53 (1). 185 -191. ISSN 0018-506X
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Official URL: http://dx.doi.org/10.1016/j.yhbeh.2007.09.015
Accumulating evidence suggests a role for estrogen in the use of a particular cognitive strategy when solving a maze task. In order to confirm the role of estrogen in this phenomenon, ovariectomized (OVX) female rats receiving either high (~ 90 pg/ml) or low (~ 32 pg/ml) circulating levels of 17β-estradiol benzoate (E2) performed a plus maze task for a reward. Consistent with previous research, OVX rats receiving low levels of E2 utilized a striatum-mediated response strategy while OVX rats administered high levels of E2 employed a hippocampus-mediated place strategy. Furthermore, following a systemic injection of a moderate dose of either a dopamine D1 (SKF 83566, 0.1 mg/kg IP) or D2 (raclopride, 0.5 mg/kg IP) receptor antagonist, low E2 rats were seen to use the opposite strategy and exercise a hippocampus-mediated place strategy in order to obtain the reward. At the same doses, high E2 rats did not change from using a place strategy. At a lower dose, these drugs shifted high E2 rats such that they showed an equal propensity for either strategy; this was not observed in low E2 rats. These results corroborate previous findings that E2 plays a significant role in the use of either a response or place strategy when solving a maze for a reward. In addition, the shift in strategy after dopamine receptor blockade implies the importance of central dopamine function in selecting a cognitive strategy to solve such tasks. It is suggested that estrogen alters cognitive strategy not only by improving hippocampal function, but also by altering dopamine-regulated striatal function.
|Divisions:||Concordia University > Faculty of Arts and Science > Psychology|
|Authors:||Quinlan, Matthew G. and Hussain, Dema and Brake, Wayne G.|
|Journal or Publication:||Hormones and Behavior|
|Keywords:||Cognitive strategy, response learning, memory, SKF 83566, raclopride, plus maze|
|Deposited By:||KUMIKO VEZINA|
|Deposited On:||09 Sep 2009 16:52|
|Last Modified:||08 Dec 2010 18:58|
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