Abstract
ABSTRACT: Dopamine has an age-dependent natriuretic and diuretic effect. We have investigated the ontogeny of the dopamine response on adenylate cyclase activity and Na+, K+-ATPase activity in two different cell populations in the infant (10-d-old) and the adult (40-d-old) rat kidney. Basal- and forskolin-stimulated adenylate cyclase activity in tubular suspensions of renal cortex was 5.4-fold (p < 0.05) higher in the 10-d-old rats than in the 40-d-old rats but unchanged between the ages in a suspension of medullary tubules. The dopamine-1 -specific agonist fenoldopam did not stimulate adenylate cyclase activity in the cortical cells from 10-d-old rats but did stimulate activity 51 ± 16% (p < 0.05) in the 40-d-old rats. In the medullary suspension, fenoldopam stimulated adenylate cyclase activity by 43.5 ± 5% (p < 0.001) in the 10-d-old rats and by 32.0 ± 7% (p < 0.01) in the 40-d-old rats. In the isolated proximal convoluted tubule, dopamine inhibited Na+, K+-ATPase activity in both the 10-d-old (34 ± 3%, p < 0.001) and 40-d-old rats (44 ± 7%, p < 0.001). In contrast, in the medullary thick ascending limb of Henlc, inhibition of Na+K+-ATPase activity by fenoldopam was more pronounced in the 10-d-old (56 ± 6%, p < 0.001) than in the 40-d-old rat (33 ± 6%, p < 0.001). In summary, the renal tubular effects of dopamine on adenylate cyclase and Na+, K+-ATPase activity change during postnatal development in a cell-specific manner.
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Fryckstedt, J., Svensson, LB., Lindén, M. et al. The Effect of Dopamine on Adenylate Cyclase and Na+, K+-ATPase Activity in the Developing Rat Renal Cortical and Medullary Tubule Cells. Pediatr Res 34, 308–311 (1993). https://doi.org/10.1203/00006450-199309000-00014
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DOI: https://doi.org/10.1203/00006450-199309000-00014
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