Corticotropin-releasing hormone in the lateral parabrachial nucleus inhibits sodium appetite in rats

The present study investigated the role of corticotropin-releasing hormone (CRH) in the lateral parabrachial nucleus (LPBN) in the behavioral control of body fluid homeostasis by determining the effect of bilateral injections of the CRH receptor antagonist, alpha-helical corticotropin-releasing fact...

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Bibliographic Details
Published in:American journal of physiology. Regulatory, integrative and comparative physiology integrative and comparative physiology, 2006-04, Vol.59 (4), p.R1136
Main Authors: Emilio De Castro e Silva, Fregoneze, Josmara B, Alan Kim Johnson
Format: Article
Language:English
Subjects:
Behavior
Body fluids
Hormones
Rodents
Sodium
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Summary:The present study investigated the role of corticotropin-releasing hormone (CRH) in the lateral parabrachial nucleus (LPBN) in the behavioral control of body fluid homeostasis by determining the effect of bilateral injections of the CRH receptor antagonist, alpha-helical corticotropin-releasing factor (CRF)9-41, and the CRH receptor agonist, CRH, on sodium chloride (salt appetite) and water (thirst) intake. Groups of adult, male Sprague-Dawley rats had stainless-steel cannulas implanted bilaterally into the LPBN and were sodium depleted or water deprived. Bilateral injections of alpha-helical CRF9-41 into the LPBN significantly potentiated water and salt intake in the sodium-depleted rats when access to fluids was restored. Bilateral injections of alpha-helical CRF9-41 into the LPBN (1.0 micro g) also increased sodium appetite in water-deprived rats. Conversely, in sodium-depleted animals, bilateral injections of CRH inhibited sodium chloride intake. These results suggest that there is an endogenous CRH inhibitory mechanism operating in the LPBN to modulate the intake of sodium (salt appetite). This mechanism may contribute to the behavioral control of restoration of body fluid homeostasis in sodium-deficient states. [PUBLICATION ABSTRACT]
ISSN:0363-6119
1522-1490