Abstract:
:Altered corticosteroid milieu induces changes in hippocampal volume, neuronal structure, neurochemistry and cognitive function in humans and rodents. This in vivo magnetic resonance spectroscopy (1H MRS) and imaging (MRI) study investigated whether long-term alterations of the corticosteroid milieu cause: (i) metabolic and/or (ii) structural changes of the rat hippocampus. Therefore, hypocortisolism was induced by adrenalectomy (ADX), normocortisolism by ADX with low-dose corticosterone replacement, and hypercortisolism by ADX and high-dose dexamethasone treatment (for 11 weeks, respectively). All groups including a control group (n=23) were studied by in vivo 1H MRS and MR volumetry. Effects of treatment on normalized hippocampal metabolites and volumes were tested for significance using one-factorial multivariate analysis of variance (MANOVA). Hypercortisolemic rats revealed significantly elevated glutamate. Hypocortisolemic rats showed significantly decreased myo-inositol ratio levels, and were associated with significantly reduced normalized hippocampal volumes. Our findings suggest chronic hypercortisolism to be associated with glutamate-mediated excitotoxicity in the absence of volumetric abnormalities. In contrast, hypocortisolism appears to be associated with neurodegenerative processes, altered astrocytic metabolism but preserved neuronal density.
journal_name
J Psychiatr Resjournal_title
Journal of psychiatric researchauthors
Schubert MI,Kalisch R,Sotiropoulos I,Catania C,Sousa N,Almeida OF,Auer DPdoi
10.1016/j.jpsychires.2007.10.003subject
Has Abstractpub_date
2008-09-01 00:00:00pages
902-12issue
11eissn
0022-3956issn
1879-1379pii
S0022-3956(07)00165-3journal_volume
42pub_type
杂志文章abstract:BACKGROUND:Various studies of child cortisol secretion and sleep show a close association between poor sleep, deterioration of the HPA axis and unfavorable psychological functioning. However, there is little evidence as to whether these associations are clearly present in pre-school children suffering from psychiatric ...
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pub_type: 杂志文章,meta分析
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