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  Vasopressin from hypothalamic magnocellular neurons has opposite actions at the adenohypophysis and in the supraoptic nucleus on ACTH secretion

Wotjak, C., Ludwig, M., Ebner, K., Russell, J., Singewald, N., Landgraf, R., et al. (2002). Vasopressin from hypothalamic magnocellular neurons has opposite actions at the adenohypophysis and in the supraoptic nucleus on ACTH secretion. European Journal of Neuroscience, 16(3), 477-485.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000E-A1A1-3 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-000E-A1A2-1
Genre: Journal Article
Alternative Title : Eur. J. Neurosci.

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 Creators:
Wotjak, CT1, Author
Ludwig, M1, Author
Ebner, K1, Author
Russell, JA1, Author
Singewald, N1, Author
Landgraf, R1, Author
Engelmann, M1, Author
Affiliations:
1Max Planck Institute of Psychiatry, Max Planck Society, ou_1607137              

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Free keywords: corticosterone; corticotropin-releasing hormone; glutamate; HPA; hypothalamic-pituitary-adrenal axis; hypothalamo- neurohypophysial system; oxytocin; stress
 Abstract: Magnocellular vasopressinergic and oxytocinergic neurons of the hypothalamic supraoptic (SON) and paraventricular nuclei comprise the hypothalamic-neurohypophysial system, which is crucially involved in the regulation of body fluid and electrolyte homeostasis. However, still controversial is to what extent the same system influences the secretion of adrenocorticotropic hormone (ACTH) from the adenohypophysis. Therefore, we selectively stimulated magnocellular neurons of the SON of conscious male Wistar rats via retrodialysis. As expected, dialysis of the SON with hypertonic medium increased both the release of vasopressin within the SON and the secretion of vasopressin and oxytocin into the systemic blood circulation. This activation of the hypothalamic- neurohypophysial system was accompanied by a fivefold increase in plasma ACTH concentration. This effect was observed only if the tip of the microdialysis probe was within the SON. Intravenous infusion of the vasopressin V1 receptor antagonist d (CH2 )(5) Tyr(Me)AVP significantly attenuated the effects of local osmotic stimulation of the SON on ACTH secretion. In contrast, administration of the same antagonist directly into the SON significantly enhanced the osmotically stimulated secretion of ACTH and corticosterone, primarily by delaying the restoration of the hormone secretion to prestimulation levels. We conclude from these findings that vasopressin from the hypothalamic-neurohypophysial system participates in the regulation of the hormonal stress response in a counterbalanced manner at the level of the SON and the adenohypophysi

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Language(s): eng - English
 Dates: 2002-08
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 4099
ISI: 000177596500018
 Degree: -

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Title: European Journal of Neuroscience
  Alternative Title : Eur. J. Neurosci.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 16 (3) Sequence Number: - Start / End Page: 477 - 485 Identifier: ISSN: 0953-816X