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The Journal of Neuroscience, March 15, 1999, 19(6):2356-2361
Effect of Chronic High-Dose Exogenous Cortisol on Hippocampal
Neuronal Number in Aged Nonhuman Primates
James B.
Leverenz1, 3, 4,
Charles W.
Wilkinson2, 4,
Molly
Wamble1,
Shannon
Corbin1,
Jo Ellen
Grabber5,
Murray A.
Raskind1, 4, and
Elaine R.
Peskind1, 4
Veterans Affairs Puget Sound Health Care System,
1 Mental Illness Research, Education, and Clinical Center
and 2 Geriatric Research, Education, and Clinical Center,
Seattle, Washington 98108, and Departments of 3 Neurology
and 4 Psychiatry and Behavioral Sciences, University of
Washington School of Medicine, Seattle, Washington 98195, and
5 Washington Regional Primate Research Center, Seattle,
Washington 98195
Chronic exposure to increased glucocorticoid concentrations appears
to lower the threshold for hippocampal neuronal degeneration in the old
rat. It has been proposed that increased brain exposure to
glucocorticoids may lower the threshold for hippocampal neuronal degeneration in human aging and Alzheimer's disease. Here, we asked
whether chronic administration of high-dose cortisol to older nonhuman
primates decreases hippocampal neuronal number as assessed by unbiased
stereological counting methodology. Sixteen Macaca
nemestrina (pigtailed macaques) from 18 to 29 years of age were
age-, sex-, and weight-matched into pairs and randomized to receive
either high-dose oral hydrocortisone (cortisol) acetate (4-6 mg/kg/d)
or placebo in twice daily palatable treats for 12 months.
Hypothalamic-pituitary-adrenal activity was monitored by measuring
plasma adrenocorticotropin and cortisol, 24 hr urinary cortisol, and
CSF cortisol. Urinary, plasma, and CSF cortisol were elevated,
and plasma adrenocorticotropin was reduced in the active treatment
group. Total hippocampal volume, subfield volumes, subfield neuronal
density, and subfield total neuronal number did not differ between the
experimental groups. These findings suggest that chronically elevated
cortisol concentrations, in the absence of stress, do not produce
hippocampal neuronal loss in nonhuman primates.
Key words:
cortisol; aging; nonhuman primate; hippocampus; stereology; CSF cortisol
Copyright © 1999 Society for Neuroscience 0270-6474/99/1962356-06$05.00/0
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