Choline acetyltransferase and TrkA expression, as well as the improvement in cognition produced by E2 and P4 in ovariectomized rats, are blocked by ICI 182 780 and RU486.
Behav Pharmacol
; 29(5): 457-461, 2018 08.
Article
in En
| MEDLINE
| ID: mdl-29319543
ABSTRACT
Treatment with 17-ß estradiol and progesterone improves the performance of ovariectomized rats in an autoshaping learning task, representing cognitive improvement. To test whether this is attributable to genomic mechanisms, the antiestrogen ICI 182 780 or antiprogesterone RU486 was injected into ovariectomized animals primed previously with estrogen or progesterone, respectively. Compared with the vehicle control, each hormone administered alone produced an elevated expression of choline acetyltransferase and TrkA, along with an improvement in performance on the behavioral test. E2+ICI reverted the increase in these two proteins. However, RU alone elicited higher ChAT expression. With this exception, there was a clear linear regression between the number of conditioned responses and the level of ChAT and TrkA in the basal forebrain. The results suggest that TrkA may be more important than ChAT for regulating autoshaping learning tasks, and that genomic mechanisms in the basal forebrain could possibly underlie hormonal improvement of cognition.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Choline O-Acetyltransferase
/
Cognition
/
Receptor, trkA
Limits:
Animals
Language:
En
Journal:
Behav Pharmacol
Journal subject:
CIENCIAS DO COMPORTAMENTO
/
FARMACOLOGIA
Year:
2018
Document type:
Article