Bartter and Gitelman Syndromes

L. Calò,V. Ravarotto

Published 2019 in Encyclopedia of Endocrine Diseases

ABSTRACT

Bartter's and Gitelman's syndrome are instances of autosomal inherited salt-losing tubulopathy characterized by hypokalemic metabolic alkalosis, renal salt-wasting, and, characteristic of Gitelman's syndrome, hypocalciuria and hypomagnesemia. As a compensatory mechanism for the volume depletion, there is activation of the renin–angiotensin–aldosterone system, yet the clinical phenotype resulting is normotensive or even hypotensive. Here the molecular mechanisms are reported that underlie the clinical manifestation of the diseases, with a closer look at the angiotensin II signaling. This hormone, by inducing short- and long-term signaling, is the key regulator of mechanisms responsible for the pathophysiology of hypertension and its complications, such as cardiovascular remodeling and atherogenesis. The lack of hypertension and cardiovascular complications depict the mirror image of hypertension in Bartter's and Gitelman's syndrome. The overall clinical, biochemical, and molecular picture may therefore contribute to understanding the mechanisms involved in cardiovascular renal remodeling and to identifying additional potential significant targets of therapy.

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