High serum androstenedione levels correlate with impaired memory in the surgically menopausal rat

A replication and new findings

Bryan W. Camp, Julia E. Gerson, Candy Wing S Tsang, Stephanie R. Villa, Jazmin I. Acosta, Brittany Braden, Ann N. Hoffman, Cheryl Conrad, Heather Bimonte-Nelson

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

After natural menopause in women, androstenedione becomes the primary hormone secreted by the residual follicle-depleted ovaries. In two independent studies, in rodents that had undergone ovarian follicular depletion, we found that higher endogenous serum androstenedione levels correlated with increased working memory errors. This led to the hypothesis that higher androstenedione levels impair memory. The current study directly tested this hypothesis, examining the cognitive effects of exogenous androstenedione administration in rodents. Middle-aged ovariectomised rats received vehicle or one of two doses of androstenedione. Rats were tested on a spatial working and reference memory maze battery including the water-radial arm maze, Morris water maze (MM) and delay match-to-sample task. Androstenedione at the highest dose impaired reference memory as well as the ability to maintain performance as memory demand was elevated. This was true for both high temporal demand memory retention of one item of spatial information, as well as the ability to handle multiple items of spatial working memory information. We measured glutamic acid decarboxylase (GAD) protein in multiple brain regions to determine whether the gamma-aminobutyric acid (GABA) system relates to androstenedione-induced memory impairments. Results showed that higher entorhinal cortex GAD levels were correlated with worse MM performance, irrespective of androstenedione treatment. These findings suggest that androstenedione, the main hormone produced by the follicle-depleted ovary, is detrimental to working memory, reference memory and memory retention. Furthermore, while spatial reference memory performance might be related to the GABAergic system, it does not appear to be altered with androstenedione administration, at least at the doses used in the current study.

Original languageEnglish (US)
Pages (from-to)3086-3095
Number of pages10
JournalEuropean Journal of Neuroscience
Volume36
Issue number8
DOIs
StatePublished - Oct 2012

Fingerprint

Androstenedione
Serum
Short-Term Memory
Aptitude
Glutamate Decarboxylase
Water
Ovary
Rodentia
Hormones
Entorhinal Cortex
Menopause
gamma-Aminobutyric Acid

Keywords

  • Aging
  • Animal model
  • GABA
  • Ovariectomy
  • Working memory

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

High serum androstenedione levels correlate with impaired memory in the surgically menopausal rat : A replication and new findings. / Camp, Bryan W.; Gerson, Julia E.; Tsang, Candy Wing S; Villa, Stephanie R.; Acosta, Jazmin I.; Braden, Brittany; Hoffman, Ann N.; Conrad, Cheryl; Bimonte-Nelson, Heather.

In: European Journal of Neuroscience, Vol. 36, No. 8, 10.2012, p. 3086-3095.

Research output: Contribution to journalArticle

Camp, Bryan W. ; Gerson, Julia E. ; Tsang, Candy Wing S ; Villa, Stephanie R. ; Acosta, Jazmin I. ; Braden, Brittany ; Hoffman, Ann N. ; Conrad, Cheryl ; Bimonte-Nelson, Heather. / High serum androstenedione levels correlate with impaired memory in the surgically menopausal rat : A replication and new findings. In: European Journal of Neuroscience. 2012 ; Vol. 36, No. 8. pp. 3086-3095.
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