Chronic treatment with estrogen receptor agonists restores acquisition of a spatial learning task in young ovariectomized rats.
Previous work has shown that continuous estradiol replacement in young ovariectomized rats enhances acquisition of a delayed matching-to-position (DMP) T-maze task over that of ovariectomized controls. The mechanism by which estradiol confers this benefit has not been fully elucidated. This study examined the role of selective estrogen receptor agonists of ERalpha, ERbeta, and GPR30 in the enhancement of spatial learning on a DMP task by comparing continuous estradiol replacement with continuous administration of PPT (an agonist of ERalpha), DPN (an agonist of ERbeta), or G-1 (an agonist of GPR30) relative to gonadally intact and ovariectomized vehicle-treated controls. It was found that ovariectomy impaired acquisition on this task, whereas all ER selective agonists restored the rate of acquisition to that of gonadally intact controls. These data suggest that estradiol can work through any of several estrogen receptors to enhance the rate of acquisition on this task.
Hammond
R
R
University of Pittsburgh, Department of Pharmaceutical Sciences, Pittsburgh, PA 15261, USA. reh51@pitt.edu
Mauk
R
R
Ninaci
D
D
Nelson
D
D
Gibbs
R B
RB
D000818:Animals; D003517:Cyclopentanes / Q000494:pharmacology; D004958:Estradiol / Q000097:blood; D047628:Estrogen Receptor alpha / Q000819:agonists* / Q000378:metabolism; D047629:Estrogen Receptor beta / Q000819:agonists* / Q000378:metabolism; D005260:Female; D007858:Learning / Q000187:drug effects* / Q000502:physiology; D007986:Luteinizing Hormone / Q000097:blood; D018782:Maze Learning / Q000187:drug effects / Q000502:physiology; D009483:Neuropsychological Tests; D009570:Nitriles / Q000494:pharmacology; D010052:Ovariectomy; D010636:Phenols; D011720:Pyrazoles / Q000494:pharmacology; D011804:Quinolines / Q000494:pharmacology; D051381:Rats; D017207:Rats, Sprague-Dawley; D043562:Receptors, G-Protein-Coupled / Q000819:agonists* / Q000378:metabolism; D020845:Selective Estrogen Receptor Modulators / Q000494:pharmacology; D013028:Space Perception / Q000187:drug effects* / Q000502:physiology; D013997:Time Factors; D011422:Propionates
D003517:Cyclopentanes; D004958:Estradiol; D047628:Estrogen Receptor alpha; D047629:Estrogen Receptor beta; D007986:Luteinizing Hormone; D009570:Nitriles; D010636:Phenols; D011720:Pyrazoles; D011804:Quinolines; D043562:Receptors, G-Protein-Coupled; D020845:Selective Estrogen Receptor Modulators; C517943:1-(4-(6-bromobenzo(1,3)dioxol-5-yl)-3a,4,5,9b-tetrahydro-3H-cyclopenta(c)quinolin-8-yl)ethanone; C486182:2,3-bis(4-hydroxyphenyl)-propionitrile; D011422:Propionates; C520305:Gper1 protein, rat; C486184:4,4',4''-(4-propyl-((1)H)-pyrazole-1,3,5-triyl) tris-phenol