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      Antagonistic Effects of Sulpiride – Racemic and Enantiomers – on Renal Response to Low-Dose Dopamine Infusion in Normal Women

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          In healthy women during moderate hydrosaline retention we have evaluated the antagonistic effects of sulpiride – enantiomers and racemic – on the renal action of a low-dose dopamine (DA) infusion (0.1 μg/kg/min). The studies were performed, in hypotonic polyuria, by the clearance (Cl) method in (1) hydrosaline retention (n = 23), (2) retention + dl-sulpiride (n = 8), (3) retention + d-sulpiride and (4) retention + l-sulpiride (in the latter two cases n = 7 subjects submitted to paired studies). Hydrosaline retention was induced by deoxycorticosterone acetate treatment. A common pattern of sulpiride treatment was applied. The DA renal hyperemia is abolished by l-sulpiride while it is transitorily attenuated by d-sulpiride. In both conditions 3 and 4 the increase in glomerular filtration rate, the inhibition of fractional isosmotic sodium reabsorption and the increase in urinary sodium excretion – induced by DA in condition 1 – are suppressed. On the contrary, DA inhibition of fractional anisosmotic sodium reabsorption is not affected by sulpiride. The data indicate that DA renal hyperemia results from the action of DA on DA<sub>2</sub> receptors; the DA inhibition of sodium transport by the diluting segments does not appear to be mediated by typical DA receptors.

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          Author and article information

          S. Karger AG
          09 December 2008
          : 51
          : 4
          : 491-498
          Cattedra di Semeiotica Medica, Istituto di Clinica Medica II dell’Università di Bologna, Italia
          185382 Nephron 1989;51:491–498
          © 1989 S. Karger AG, Basel

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          Page count
          Pages: 8
          Original Paper

          Cardiovascular Medicine, Nephrology

          Receptors DA1 and DA2 , Dopamine, Sulpiride enantiomers


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