Altered mesencephalic dopaminergic populations in adulthood as a consequence of brief perinatal glucocorticoid exposure

McArthur, S., McHale, E., Dalley, J.W., Buckingham, J.C. and Gillies, G.E. 2005. Altered mesencephalic dopaminergic populations in adulthood as a consequence of brief perinatal glucocorticoid exposure. Journal of Neuroendocrinology. 17 (8), pp. 475-482. doi:10.1111/j.1365-2826.2005.01331.x

TitleAltered mesencephalic dopaminergic populations in adulthood as a consequence of brief perinatal glucocorticoid exposure
AuthorsMcArthur, S., McHale, E., Dalley, J.W., Buckingham, J.C. and Gillies, G.E.
Abstract

Early exposure to stressors is strongly associated with enduring effects on central nervous system function, but the mechanisms and neural substrates involved in this biological 'programming' are unclear. This study tested the hypothesis that inappropriate exposure to glucocorticoid stress hormones (GCs) during critical periods of development permanently alters the mesencephalic dopaminergic populations in the ventral tegmental area (VTA) and substantia nigra pars compacta (SNc). Using a rat model, the synthetic GC dexamethasone was added to the maternal drinking water during gestational days 16-19 or over the first week of postnatal life. In adulthood, the effects upon tyrosine hydroxylase immunopositive (TH+) cell numbers in the midbrain, and monoamine levels in the forebrain, of the adult offspring were assessed and compared with control offspring whose dams received normal drinking water. In the VTA, both prenatal and postnatal dexamethasone treatment increased TH+ cell numbers by approximately 50% in males and females. Although prenatal dexamethasone treatment also increased TH+ cell numbers in the SNc by 40-50% in males and females, postnatal treatment affected females only by increasing TH+ cell numbers by approximately 30%. In comparison, similar changes were not detected in the monoamine levels of the dorsolateral striatum, nucleus accumbens or infralimbic cortex of either males or females, which is a feature likely to reflect adaptive changes in these pathways. These studies demonstrate that the survival or phenotypic expression of VTA and SNc dopaminergic neurones is profoundly influenced by brief perinatal exposure to GCs at times when endogenous levels are normally low. These findings are the first to demonstrate permanent changes in the cytoarchitecture within midbrain dopamine nuclei after perinatal exposure to stress hormones and implicate altered functionality. Thus, they have significance for the increasing use of GCs in perinatal medicine and indicate potential mechanisms whereby perinatal distress may predispose to the development of a range of psychiatric conditions in later life.

JournalJournal of Neuroendocrinology
Journal citation17 (8), pp. 475-482
ISSN0953-8194
YearAug 2005
PublisherWiley
Digital Object Identifier (DOI)doi:10.1111/j.1365-2826.2005.01331.x
Publication dates
PublishedAug 2005

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