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Vol. 289, Issue 1, 194-201, April 1999
Hormonal Laboratory (M.B.-M., W.J., N.B., A.L.,
M.M.-R., R.M.M., M.P., F.R.) and
Liver Unit (J.-L.P., V.A., J.R.),
Institut d'Investigacions Biomèdiques August Pi i Sunyer,
Hospital Clínic Universitari, University of Barcelona,
Barcelona, Spain
-Opioid receptor agonists (niravoline) or nonpeptide antidiuretic
hormone (ADH) V2 receptor antagonists (OPC-31260)
possess aquaretic activity in cirrhosis; however, there is no
information concerning the effects induced by the chronic
administration of these drugs under this condition. To compare the
renal and hormonal effects induced by the long-term oral administration
of niravoline, OPC-31260, or vehicle, urine volume, urinary osmolality,
sodium excretion, and urinary excretion of aldosterone (ALD) and ADH were measured in basal conditions and for 10 days after the daily oral
administration of niravoline, OPC-31260, or vehicle to cirrhotic rats
with ascites and water retention. Creatinine clearance, serum osmolality, ADH mRNA expression, and systemic hemodynamics were also
measured at the end of the study. Niravoline increased water excretion,
peripheral resistance, serum osmolality, and sodium excretion and
reduced creatinine clearance, ALD and ADH excretion, and mRNA
expression of ADH. OPC-31260 also increased water metabolism and sodium
excretion and reduced urinary ALD, although the aquaretic effect was
only evident during the first 2 days, and no effects on serum
osmolality, renal filtration, and systemic hemodynamics were observed.
Therefore, both agents have aquaretic efficacy, but the beneficial
therapeutic effects of the long-term oral administration of niravoline
are more consistent than those of OPC-31260 in cirrhotic rats with
ascites and water retention.
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