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          Institute: MPI für medizinische Forschung     Collection: Abteilung Molekulare Neurobiologie     Display Documents

ID: 566728.0, MPI für medizinische Forschung / Abteilung Molekulare Neurobiologie
Lipopolysaccharide Endotoxin Potentiates the Effect of Osmotic Stimulation on Vasopressin Synthesis and Secretion in the Rat Hypothalamus
Translation of Title:Lipopolysaccharide Endotoxin Potentiates the Effect of Osmotic Stimulation on Vasopressin Synthesis and Secretion in the Rat Hypothalamus
Authors:Grinevich, Valery; Ma, Xin−Ming; Jirikowski, Gustav F.; Verbalis, Joseph; Aguilera, Greti
Date of Publication (YYYY-MM-DD):2003-02-01
Title of Journal:J. Neuroendocrinol.
Journal Abbrev.:J. Neuroendocrinol.
Issue / Number:2
Start Page:141
End Page:149
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:Vasopressin secreted by magnocellular neurones of the hypothalamic supraoptic and paraventricular nuclei is essential for water balance. In this study, we examined magnocellular neurone responses to osmotic stimulation in vehicle−injected controls or rats receiving an intraperitoneal (i.p.) injection of 250 µg/100 g of lipopolysaccharide (LPS), 3 h or 6 h earlier. LPS injection had no effect on plasma vasopressin concentrations in control rats but it caused marked and transient potentiation of the responses to a single i.p. injection of hypertonic saline (five− and two−fold, 3 and 6 h after LPS, respectively). The enhancement of plasma vasopressin responses was independent of plasma sodium concentrations or changes in blood pressure. Basal vasopressin mRNA expression in the paraventricular and supraoptic nuclei decreased slightly 6 h after LPS injection, without changes in vasopressin transcription as indicated by vasopressin heteronuclear (hn) RNA levels. Parvocellular neurones showed expected increases in vasopressin hnRNA expression following LPS injection and a further increase after i.p. hypertonic saline injection (due to the painful component). In contrast to magnocellular vasopressin mRNA expression, the effects of LPS and hypertonic saline injections in parvocellular neurones were additive and not synergistic. Light microscopic immunohistochemical examination revealed an increase in size of vasopressin but not oxytocin axonal terminals in the neural lobe 3 h after LPS injection. Osmotic stimulation caused marked depletion of vasopressin immunoreactivity in axonal terminals of the neural lobe in both control and LPS−pretreated rats. The changes in vasopressin axon terminals were accompanied by induction of interleukin (IL)−1β and IL−6 in the posterior pituitary. The data show that endotoxemia causes morphological and functional alterations of the hypothalamic neurohypophyseal system, resulting in facilitation rather than inhibition of vasopressin synthesis, and secretion in response to osmotic stimulation
Free Keywords:lipopolysaccharide; osmotic stimulation; vasopressin; hypothalamic supraoptic and paraventricular nuclei
Last Change of the Resource (YYYY-MM-DD):--
External Publication Status:published
Document Type:Article
Communicated by:Wulf Kaiser
Affiliations:MPI für medizinische Forschung/Abteilung Molekulare Neurobiologie
MPI für medizinische Forschung/Abteilung Molekulare Neurobiologie/Gruppe Pavel Osten
MPI für medizinische Forschung/Abteilung Molekulare Neurobiologie/Gruppe Valery Grinevich
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