Renal gluconeogenic response to different diuretics. I. In vitro effects of mersalyl, furosemide and ethacrynic acid on isolated rat renal tubules

We have studied the effects of the diuretics mersalyl, furosemide and ethacrynic acid on renal gluconeogenesis is isolated rat-kidney tubules and on the activities of the most important gluconeogenic and glycolytic enzymes in both fed and fasted rats. Mersalyl (15 mg.kg-1 animal weight) significantly decreased the rate of gluconeogenesis in well-fed rats (68%) as well as in 24 and 48-h fasted ones (33 and 37% respectively). This inhibition occurred when lactate, pyruvate, glycerol or fructose were used as substrates. Ethacrynic acid at a dose of 50 mg.kg-1 animal weight provoked a transient inhibition of renal glucose production by almost 20% but only in fed rats with lactate as substrate, whereas the same dose of furosemide did not affect this metabolic pathway. Parallel to these changes, mersalyl caused a significant inhibition in the maximum activity of the most important gluconeogenic enzymes, phosphoenolpyruvate carboxykinase, fructose 1,6-bisphosphatase and glucose 6-phosphatase, in both fed and fasted rats. Neither ethacrynic acid nor furosemide produced any variations in the activities of these enzymes. The activity of the glycolytic enzymes phosphofructokinase and pyruvate kinase was not modified by these diuretics. Nevertheless, the activity of the thiol-enzyme glyceraldehyde 3-phosphate dehydrogenase was severely inhibited by mersalyl and to a lesser extent by the other diuretics. This inhibition was higher in fasted than fed rats. Hence, we conclude that the inhibitory effect of mersalyl on renal gluconeogenesis is due, at least partly, to a decrease in the flux through the gluconeogenic enzymes.(ABSTRACT TRUNCATED AT 250 WORDS)

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Metabolic adaptation of renal carbohydrate metabolism. V.In vivo response of rat renal-tubule gluconeogenesis to different diuretics

Amores

Hortelano

Garcı́a-Salguero

et al. 1994

Mol Cell Biochem

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Renal gluconeogenic response to different diuretics. II. Glucose production in the early hours after mersalyl, furosemide and ethacrynic acid administration

et al. 1989

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Renal gluconeogenic response to different diuretics. I. In vitro effects of mersalyl, furosemide and ethacrynic acid on isolated rat renal tubules

Cited by 2 publications

References 14 publications

Metabolic adaptation of renal carbohydrate metabolism. V.In vivo response of rat renal-tubule gluconeogenesis to different diuretics

Metabolic adaptation of renal carbohydrate metabolism. V.In vivo response of rat renal-tubule gluconeogenesis to different diuretics

Renal gluconeogenic response to different diuretics. II. Glucose production in the early hours after mersalyl, furosemide and ethacrynic acid administration

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