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  • Title: Influence of sodium valproate on sodium and chloride urinary excretion in rats, gender differences.
    Author: Grikiniene J, Stakisaitis D, Tschaika M.
    Journal: Pharmacology; 2005 Nov; 75(3):111-5. PubMed ID: 16103742.
    Abstract:
    Evidence exists indicating that sodium valproate (VPA) increases diuresis in rats. The chloriuretic and natriuretic effect of VPA has not previously been investigated, so the aim of the present study was to define the peculiarities of 24-hour urinary sodium (Na) and chloride (Cl) excretion in young adult Wistar rats of both genders, and to evaluate the effects of VPA. 24-hour urinary Na, Cl, creatinine and pH levels were measured in 28 control intact Wistar rats and 26 Wistar rats after a single intragastric administration of 300 mg/kg VPA. After VPA administration, 24-hour diuresis and 24-hour diuresis per 100 g of body weight were significantly higher in VPA rats of both genders. 24-hour urine Na and Cl excretion were significantly higher in VPA male and VPA female rats than in gender-matched controls. The 24-hour urinary Cl excretion was found to be significantly higher in VPA male than in VPA female rats. The study data show that VPA, alongside the diuretic effect, enhances Na and Cl excretion with urine. The 24-hour chloriuretic response to VPA in male rats was significantly higher than in female rats. The mechanism of such a gender-related effect is not yet clear.
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