Cognition in female rats after blocking conversion of androgens to estrogens
| Autor: | Jacob Huffman, Omar H. Cabrera, George T. Taylor, Jessica Hoffman, Francesca M. Manzella |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Testosterone propionate medicine.medical_specialty medicine.drug_class medicine.medical_treatment Steroid 03 medical and health sciences Behavioral Neuroscience chemistry.chemical_compound Cognition 0302 clinical medicine Endocrinology Internal medicine Nitriles medicine Animals Rats Long-Evans Testosterone Aromatase Maze Learning Radial arm maze Aromatase inhibitor Estradiol biology Aromatase Inhibitors Endocrine and Autonomic Systems Letrozole Uterus Estrogens Triazoles Rats 030104 developmental biology chemistry Androgens biology.protein Ovariectomized rat Female Psychology 030217 neurology & neurosurgery medicine.drug |
| Zdroj: | Hormones and Behavior. 90:84-89 |
| ISSN: | 0018-506X |
| DOI: | 10.1016/j.yhbeh.2017.02.011 |
| Popis: | Women and non-human females have surprisingly high levels of circulating testosterone, yet the effects of androgens on non-reproductive behaviors, including cognition, of females are not well characterized. The current project used an aromatase inhibitor, letrozole, to block conversion of androgens to estrogens. Adult female rats were ovariectomized and administered either vehicle only, testosterone propionate only (400μg/kg, TP only), letrozole only (1mg/kg, Letro only), or the combination of letrozole and testosterone (TP+Letro) over 4weeks. A gonadally intact group was used for comparisons. During the last 3weeks, the animals were tested for working memory in both a spatial task (radial arm maze) and a non-spatial task (object recognition). At sacrifice, uterine weights and serum testosterone and estradiol were determined. Behavioral results were the intact animals showed better working memories on the object recognition task, but that there were no differences among the ovariectomized groups. In the radial arm maze task, groups with best to worst performance were TP only>Intact=TP+Letro>vehicle=Letro only. Highest to lowest serum titers, for testosterone, were TP+Letro>TP only>Intact=Letro only>vehicle and, for estradiol, Intact>TP only>Vehicle>Letro only=TP+Letro. Our interpretation is that testosterone enhanced spatial performance when bioavailability of both TP and E2 are high, and high testosterone can rescue spatial memory when E2 bioavailability is low. |
| Databáze: | OpenAIRE |
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