Centrally administered ascorbic acid induces antidiuresis, natriuresis and neurohypophyseal hormone release in rats.

OBJECTIVE

Ascorbic acid represents one of the most important antioxidants and neuromodulators, and plays an important role in the cerebral system. In the present study, we investigated the central effect of ascorbic acid on fluid regulation and electrolyte homeostasis.

METHODS

Male Wistar rats were implanted with stainless steel cannulas into the lateral ventricle, and sodiun excretion and urinary volume were measured after intracerebroventricular (i.c.v.) injection of ascorbic acid (200 or 600 nmol/rat). In another set of experiments, vasopressin and oxytocin plasma levels were evaluated 10, 20 and 30 minutes after ascorbic acid i.c.v. injection.

RESULTS

The administration of ascorbic acid to conscious rats resulted in a significant decrease in urinary volume and an increase in the renal excretion of sodium, with a concomitant increase in the plasma levels of vasopressin and oxytocin.

CONCLUSIONS

These results suggest that ascorbic acid may play a significant role in the central regulation of fluid and electrolyte homeostasis.