| Item type: | Article | ||||
|---|---|---|---|---|---|
| Journal or Publication Title: | Neuropsychopharmacology | ||||
| Publisher: | NATURE PUBLISHING GROUP | ||||
| Place of Publication: | LONDON | ||||
| Volume: | 29 | ||||
| Number of Issue or Book Chapter: | 1 | ||||
| Page Range: | pp. 1-14 | ||||
| Date: | 2004 | ||||
| Institutions: | Biology, Preclinical Medicine > Institut für Zoologie > Tierphysiologie/Neurobiologie (Prof. Dr. Inga Neumann) | ||||
| Identification Number: |
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| Keywords: | PITUITARY-ADRENAL AXIS; NEUROENDOCRINE STRESS RESPONSES; BEHAVIORAL CONSEQUENCES; PARAVENTRICULAR NUCLEUS; ANTISENSE OLIGODEOXYNUCLEOTIDE; HORMONE RECEPTOR-2; SOCIAL RECOGNITION; VENTRAL FOREBRAIN; EMOTIONAL-STRESS; CHRONIC INFUSION; AVP; CRH; oxytocin; HAB; microdialysis; emotionality | ||||
| Dewey Decimal Classification: | 500 Science > 590 Zoological sciences | ||||
| Status: | Published | ||||
| Refereed: | Yes, this version has been refereed | ||||
| Created at the University of Regensburg: | Yes | ||||
| Item ID: | 71877 |
Web of ScienceAbstract
To model aspects of trait anxiety/depression, Wistar rats were bred for extremes in either hyper (HAB)- or hypo (LAB)-anxiety as measured on the elevated plus-maze and in a variety of additional behavioral tests. Similar to psychiatric patients, HAB rats prefer passive stress-coping strategies, indicative of depression-like behavior, show hyper-reactivity of the hypothalamo-pituitary adrenal ...
Abstract
To model aspects of trait anxiety/depression, Wistar rats were bred for extremes in either hyper (HAB)- or hypo (LAB)-anxiety as measured on the elevated plus-maze and in a variety of additional behavioral tests. Similar to psychiatric patients, HAB rats prefer passive stress-coping strategies, indicative of depression-like behavior, show hyper-reactivity of the hypothalamo-pituitary adrenal axis, and a pathological response to the dexamethasone/corticotropin-releasing hormone (CRH) challenge test. Here we tested central mRNA expression, release patterns, and receptor binding of neuropeptides critically involved in the regulation of both anxiety-related behavior and the HPA axis. Thus, CRH, arginine-8-vasopressin (AVP), and oxytocin (OXT) were studied in brains of HAB and LAB males both under basal conditions and after exposure to a mild emotional stressor. In HAB rats, CRH mRNA was decreased in the bed nucleus of the stria terminalis only. While no significant difference in CRH1-receptor binding was found in any brain area, CRH2-receptor binding was elevated in the hypothalamic paraventricular nucleus (PVN), the ventromedial hypothalamus, and the central amygdala of HABs compared to LABs. AVP, but not OXT, mRNA expression as well as release of the neuropeptide, were higher in the PVN of HABs, whereas AVP V1a-receptor binding failed to show significant differences in any brain region studied. Remarkably, intra-PVN treatment of HABs with the AVP V1-receptor antagonist d (CH(2))(5) Tyr (Me) AVP resulted in a decrease in anxiety/depression-related behavior. The elevated expression and release of AVP within the PVN of HAB rats together with the behavioral effects of the AVP V1-receptor antagonist suggest a critical involvement of this neuropeptide in neuroendocrine and behavioral phenomena associated with trait anxiety/depression.
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