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Therapeutische Umschau. Revue therapeutique 2000-Jun

[Pharmacologic action of diuretics in the kidney].

يمكن للمستخدمين المسجلين فقط ترجمة المقالات
الدخول التسجيل فى الموقع
يتم حفظ الارتباط في الحافظة
P Ferrari
F J Frey

الكلمات الدالة

نبذة مختصرة

The currently available diuretics increase the urinary excretion of sodium chloride by selective inhibition of specific sodium transporters in the loop of Henle and distal nephron. In recent years, the molecular cloning of the distal diuretic-sensitive sodium transporters has improved our understanding of the cellular mechanisms of action of each class of diuretics. The identification of mutations in the genes encoding these transporters in inherited disorders characterized by altered salt balance has provided unequivocal evidence for the roles of the cloned diuretic-sensitive transporters in sodium homeostasis. The biochemical abnormalities observed in these disorders are identical to those induced by the specific diuretic. In the Guibaud-Vainsel syndrome (renal-tubular acidosis with osteopetrosis) the renal disturbances are comparable to the effects of a therapy with acetazolamide. Mutations in the proximal tubular carbonic anhydrase type II are the cause of this rare disorder. Bartter syndrome shows identical biochemical abnormalities as those found with chronic furosemide therapy. This syndrome is caused by mutations in the furosemide-sensitive Na-K-2Cl cotransporter in the thick ascending loop of Henle. In Gitelman syndrome the characteristic electrolyte and hormonal changes in blood and urine are comparable to those observed in patients treated with thiazide diuretics. This disorder results from mutations in the distal-tubular thiazide-sensitive Na-Cl cotransporter. The two forms of pseudhypoaldosteronism are distinguished by the characteristic metabolic changes encountered with a therapy with potassium-sparing diuretics. The genetic disturbance resides either in the amiloride-sensitive epithelial sodium channel (autosomal-dominant form) or in the spironolactone-sensitive mineralocorticoid receptor (autosomal-recessive form) in the distal tubule and cortical collecting duct. Current research concentrates on defining the structural sites for electrolyte transport and diuretic binding, as well as the molecular mechanisms of transport regulation. This information may allow a more appropriate use of diuretics and the design of new substances with diuretic action.

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