Abstract：
:Nitric oxide, an endogenous gas produced by nitric oxide synthase (NOS), has been described as a neuromodulator of hormone secretion, including the neurohypophysial peptides oxytocin (OT) and vasopressin (AVP), hormones involved in the sodium and water homeostasis. The presence of NOS in the hypothalamic nuclei as well as in the circumventricular organs suggests a nitrergic regulation of OT and AVP secretion. Thus, the aim of this study was to evaluate the effect of 7-nitroindazole (7-NI), a selective inhibitor of neuronal NOS, in the plasma OT and AVP levels in rats submitted to a short and long-term salt loading. We also evaluated the NOS activity in the supraoptic (SON) and paraventricular (PVN) hypothalamic nuclei. Our data showed an increase of plasma OT and AVP levels in both short and long-term salt loading. The augment of plasma OT and AVP levels was accompanied by an increase of NOS activity in the SON and PVN. The injection of 7-NI potentiated the increase of plasma OT induced by salt loading, but inhibited the increase of plasma AVP in the same experimental conditions. These results indicate that, under short and prolonged osmotic stimulation, nitric oxide may differentially control the neurohypophysial secretion.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Ventura RR,Giusti-Paiva A,Gomes DA,Elias LL,Antunes-Rodrigues Jdoi
10.1016/j.neulet.2004.12.032keywords:
subject
Has Abstractpub_date
2005-05-06 00:00:00pages
75-80issue
2eissn
0304-3940issn
1872-7972pii
S0304-3940(04)01557-5journal_volume
379pub_type
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