Central carbachol stimulates vasopressin release into interstitial fluid adjacent to the paraventricular nucleus
| Autor: | Masahiro Ota, Gregory T. Festavan, Joan T. Crofton, Leonard Share |
|---|---|
| Rok vydání: | 1992 |
| Předmět: |
Male
Microdialysis medicine.medical_specialty Vasopressin Carbachol Vasopressins Neuropeptide Rats Sprague-Dawley Interstitial fluid Internal medicine medicine Animals Molecular Biology Chemistry General Neuroscience Osmolar Concentration Brain Rats Endocrinology Vasopressin secretion Hypothalamus Neurology (clinical) Extracellular Space Dialysis hormones hormone substitutes and hormone antagonists Acetylcholine Paraventricular Hypothalamic Nucleus Developmental Biology medicine.drug |
| Zdroj: | Brain Research. 592:249-254 |
| ISSN: | 0006-8993 |
| DOI: | 10.1016/0006-8993(92)91682-5 |
| Popis: | We have used an in vivo double microdialysis probe technique in conscious rats to determine whether the application of carbachol to one paraventricular nucleus (PVN) can result in increased local release of vasopressin from that PVN. Experiments were carried out 24 h after placement of microdialysis probes lateral to each PVN. When both probes were perfused initially with 0.9% NaCl, vasopressin was detected in the outflow (dialysate) from both probes. When carbachol (100 micrograms/ml) was included in the perfusate of one probe for the first 10 min of a 30-min collection period, while the other probe continued to be perfused with saline alone, there was a seven-fold increase in the concentration of vasopressin in the dialysate from the carbachol-perfused probe; the vasopressin concentration in the dialysate from the contralateral probe increased only slightly. The plasma vasopressin concentration was also elevated. When one of the paired probes was perfused with carbachol (100 micrograms/ml) for 30 min, there were similar increases in the concentration of vasopressin in the dialysate from both probes and a sustained increase in the plasma vasopressin concentration. Thus, vasopressin is released into the interstitial fluid adjacent to the PVN under basal conditions, and this release can be substantially increased when vasopressin secretion to the periphery is stimulated. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|