Abstract
The aim of the present study was to assess the effect of cicletanine on renal cGMP production. To do so we measured mean arterial pressure (MAP), creatinine clearance (CC), and urinary excretion of electrolytes and cGMP under basal conditions and after 6 h of cicletanine administration (10 and 15 mg/kg body weight by oral gavage) in conscious Wistar rats. Also, the in vitro effect of cicletanine was assessed by incubating renal slices and isolated rat glomeruli with two concentrations of cicletanine (0.1 and 1 mM) for different times (1, 2, 5, and 30 min) in the presence of 3-isobutyl-1-methylxanthine. Oral administration of cicletanine induced an increase in urinary flow (V) and the urinary excretion of electrolytes and cGMP, with no changes in CC. In addition, a significant decrease in MAP was observed, but only with the lower dose. Incubation with cicletanine did not induce significant changes in cGMP production in glomeruli or renal slices. These results show that cicletanine, administered in vivo at diuretic and antihypertensive doses, induces an increase in urinary cGMP excretion.
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