Donner, Nina and Neumann, Inga D. (2009) Effects of Chronic Intracerebral Prolactin on the Oxytocinergic and Vasopressinergic System of Virgin Ovariectomized Rats. NEUROENDOCRINOLOGY, 90 (3). pp. 315-322. ISSN 0028-3835, 1423-0194
Full text not available from this repository. (Request a copy)Abstract
Chronic intracerebroventricular (icv) infusion of prolactin (PRL) into the cerebral ventricles and mimicking central hyperprolactinemia in lactation has recently been shown to reduce anxiety and neuronal as well as neuroendocrine responses to acute stressor exposure. Here, we studied the effects of icv PRL on the activity of the oxytocin (OXT) and arginine vasopressin (AVP) systems of virgin female, ovariectomized, estradiol-substituted Wistar rats. Ovine PRL was delivered via osmotic minipumps at 0.01, 0.1 or 1 mu g/h for 5 days. Under basal conditions, both plasma OXT and AVP concentrations were increased after chronic PRL treatment (1 mu g/h). At hypothalamic level, this was accompanied by an increased c-fos and OXT mRNA expression within the supraoptic nucleus, the main source of plasma OXT, whereas AVP mRNA levels remained unchanged. No effect of PRL on c-fos or on nonapeptide mRNA expression was found in the hypothalamic paraventricular nucleus. Moreover, chronic PRL abolished the rise in plasma OXT induced by acute exposure to 30 min restraint stress in vehicle-treated rats. However, restraint stress did not significantly alter OXT or AVP mRNA expression in the hypothalamus of either vehicle- or PRL-treated animals. From these results we conclude that brain hyperprolactinemia alters the synthetic activity of OXT neurons and the secretory performance of OXT and AVP neurons within the hypothalamus, resulting in elevated plasma concentrations of both hormones under basal conditions. These changes are comparable to adaptations seen in the female peripartum period. Copyright (C) 2009 S. Karger AG, Basel
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RECEPTOR MESSENGER-RNA; HYPOTHALAMIC PARAVENTRICULAR NUCLEUS; NEUROENDOCRINE STRESS RESPONSES; PITUITARY-ADRENAL ACTIVITY; LACTATING RATS; MATERNAL-BEHAVIOR; GENE-EXPRESSION; FEMALE RATS; LONG FORM; PROGESTERONE WITHDRAWAL; Prolactin; Oxytocin; Vasopressin; Supraoptic nucleus; Paraventricular nucleus; c-fos; Restraint stress |
| Subjects: | 500 Science > 570 Life sciences 500 Science > 590 Zoological sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Zoologie Biology, Preclinical Medicine > Institut für Zoologie > Tierphysiologie/Neurobiologie (Prof. Dr. Inga Neumann) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 Oct 2020 08:08 |
| Last Modified: | 13 Oct 2020 08:08 |
| URI: | https://pred.uni-regensburg.de/id/eprint/29819 |
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