Effects of the GABAergic agent sodium valproate on the arginine vasopressin responses to hypertonic stimulation and upright posture in man.

Abstract:

:In order to evaluate the possible influence of GABAergic neurotransmission on the arginine vasopressin (AVP) response to osmotic and pressure volumetric stimuli, the GABAergic drug sodium valproate was administered by mouth (200 or 400 mg 16 h, 8 h and just before tests) to eight normal men before osmotic (i.v. infusion of 0.51 , NaCl for 2 h) and orthostatic (standing upright and maintaining an orthostatic position for 20 min) tests. In both experimental conditions, the AVP rise was significantly lower in the presence than in absence of sodium valproate. The maximum AVP responses in the control orthostatic and osmotic tests were respectively 2.3 and 2.5 times higher than basal levels. When 600 mg sodium valproate was given, the maximum AVP rise in response to hypovolaemic and osmotic stimuli were respectively 1.75 and 2.1 times higher than basal value. Similar results were obtained giving 1.2 g sodium valproate. These results suggest that in man a GABAergic pathway is involved in the AVP responses to hypovolaemic and hyperosmotic stimuli.

journal_name

Clin Endocrinol (Oxf)

journal_title

Clinical endocrinology

authors

Chiodera P,Gnudi A,Volpi R,Marchesi C,Marchesi M,Davoli D,Capretti L,Coiro V

doi

10.1111/j.1365-2265.1989.tb00437.x

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

389-95

issue

4

eissn

0300-0664

issn

1365-2265

journal_volume

30

pub_type

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