Aldosterone, the primary adrenal mineralocorticoid hormone, as an integral part of the renin-angiotensin-aldosterone system (RAAS), is crucial in blood pressure regulation and maintaining sodium and potassium levels. It interacts with the mineralocorticoid receptor (MR) expressed in the kidney and promotes sodium and water reabsorption, thereby increasing blood pressure. However, MRs are additionally expressed in other cells, such as cardiomyocytes, the endothelium, neurons, or brown adipose tissue cells. Therefore, aldosterone (especially aldosterone excess) may have other major impacts besides simply regulating blood pressure and circulating ion balance. Recent studies have reported a non-hypertensive impact on the cardiovascular, immune, and metabolic systems, a pro-oxidant effect, and a pro-fibrotic effect. In this review, we emphasise the non-hypertension-related effects of aldosterone, including advances in our understanding of the cellular mechanisms by which aldosterone mediates its cellular effects. We also summarise potential clinical complications related to both the hypertensive and non-hypertensive effects of aldosterone.
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