Continuous estrone treatment impairs spatial memory and does not impact number of basal forebrain cholinergic neurons in the surgically menopausal middle-aged rat

Elizabeth B. Engler-Chiurazzi, Joshua S. Talboom, Brittany Braden, Candy W S Tsang, Sarah Mennenga, Madeline Andrews, Laurence M. Demers, Heather Bimonte-Nelson

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

CEE (conjugated equine estrogens) is the most widely prescribed estrogen-only menopausal hormone therapy in the United States, and is comprised of over 50% estrone (E1) sulfate. Following CEE administration, E1 is the principal circulating estrogen. However, the cognitive and neurobiological effects of E1 in a middle-aged rodent model have not yet been evaluated. We assessed cognitive effects of continuous E1 treatment in middle-aged surgically menopausal rats using a maze battery. We also quantified number of choline acetyltransferase-immunoreactive (ChAT-IR) neurons in distinct basal forebrain regions known in earlier studies in to be impacted by the most potent naturally-circulating estrogen in rodents and women, 17β-estradiol (17β-E2), as well as CEE. On the spatial working memory delayed-match-to-sample water maze, the highest E1 dose impaired memory performance during acquisition and after delay challenge. E1 did not impact ChAT-IR neuron number in the medial septum (MS) or horizontal/vertical diagonal bands. In a comparison study, 17β-E2 increased MS ChAT-IR neuron number. Findings indicate that E1 negatively impacts spatial working memory and memory retention, and does not increase ChAT-IR neuron number in basal forebrain, as does 17β-E2. Thus, data from prior studies suggest that 17β-E2 and CEE can enhance cognition and increase number of ChAT-IR basal forebrain neurons, while here we show that E1 does not induce these effects. Findings from preclinical basic science studies can inform the design of specific combinations of estrogens that could be beneficial to the brain and cognition. Accumulating data suggest that E1 is not likely to be among these key beneficial estrogens.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalHormones and Behavior
Volume62
Issue number1
DOIs
StatePublished - Jun 2012

Keywords

  • 17β-Estradiol
  • Basal forebrain
  • Choline acetyltransferase
  • Estrogen
  • Estrone
  • Premarin
  • Spatial memory
  • Working memory

ASJC Scopus subject areas

  • Endocrinology
  • Endocrine and Autonomic Systems
  • Behavioral Neuroscience

Fingerprint Dive into the research topics of 'Continuous estrone treatment impairs spatial memory and does not impact number of basal forebrain cholinergic neurons in the surgically menopausal middle-aged rat'. Together they form a unique fingerprint.

Cite this