Serotonin stimulates aldosterone secretion both in vitro and in vivo, and serotonin antagonism decreases plasma aldosterone levels in patients with idiopathic aldosteronism. This study was designed to assess the effects of the serotonin precursor, 5-hydroxytryptophan (5HTP), upon aldosterone secretion in man, and to determine whether stimulatory effects of 5HTP are mediated through the central ...

Aldosterone plays an important role in regulating Na-Cl reabsorption and blood pressure. Epithelial Na+ channel, Na+-Cl- cotransporter, and Cl-/HCO3- exchanger pendrin are the major mediators of Na-Cl transport in the aldosterone-sensitive distal nephron. Existing evidence also suggests that plasma K+ concentration affects renal Na-Cl handling. In this study, we posited that hypokalemia modulat...

The molecular mechanism underlying aldosterone/salt-induced cardiovascular injury remains to be defined. This work was undertaken to determine the role of apoptosis signal-regulating kinase 1 (ASK1) in the mechanism underlying aldosterone-induced cardiac injury in vivo. We compared the in vivo effects of 4 weeks of aldosterone/salt treatment on wild-type and ASK1-deficient mice. Aldosterone inf...

We reported aldosterone as a novel adipocyte-derived factor that regulates vascular function. We aimed to investigate molecular mechanisms, signaling pathways, and functional significance of adipocyte-derived aldosterone and to test whether adipocyte-derived aldosterone is increased in diabetes mellitus-associated obesity, which contributes to vascular dysfunction. Studies were performed in the...

Aldosterone is thought to modulate renal fibrosis, in part, through increasing plasminogen activator inhibitor type 1 (PAI-1), a major inhibitor of ECM degradation. The present study investigated aldosterone effects on PAI-1 and transforming growth factor (TGF)-beta(1) and asked whether PAI-1 effects were TGF-beta mediated and whether aldosterone and TGF-beta(1) acted synergistically to increas...

BACKGROUND Maximal aldosterone secretion in healthy dogs occurs 30 minutes postadrenocorticotropin (ACTH; 5 μg/kg IV) stimulation. The effect of trilostane and mitotane on aldosterone at that time is unknown. OBJECTIVES To assess the effect of trilostane and mitotane in dogs with pituitary-dependent hyperadrenocorticism on aldosterone secretory reserve. To determine if aldosterone concentrati...

Although stereospecificity is characteristic of the reactions of single enzymes, both optical antipodes are usually metabolized in a qualitatively similar manner in the intact animal (l-4) where numerous possibilities of enzyme attack exist. When dl-aldosterone and other racemic steroids are added to enzyme or microbial systems (5, 6), only the naturally occurring d antipodes undergo reaction, ...

Three siblings (1 boy, 2 girls) with hypertension and hypokalemia are presented, two with low plasma aldosterone and suppressed renin activity and the eldest with a high renin and aldosterone level due to secondary changes in her kidneys. Urinary tetrahydrocortisol (THF) was increased relative to tetrahydrocortisone (THE). Cortisol ring A reduction constant was also lower than normal. Thes...

ALTHOUGH angiotensin, potassium, sodium, and adrenocorticotrophic hormone are generally acknowledged as major direct influences on aldoster-one secretion, there is a strong case for the existence of other factors which affect aldosterone secretion and which may play physiological roles (see Cogh-lan et al., 1979, for review). The plasma aldosterone response to metoclopramide (a dopamine antagon...

The important renal endocrine aspect implicated in gym nephropathy is the activation of renin-angiotensin-aldosterone system (RAAS). Intense exercise can lead to increased sympathetic nervous activity, resulting release renin from juxtaglomerular cells kidneys. Renin acts on angiotensinogen, leading generation angiotensin II, a potent vasoconstrictor. Angiotensin II stimulates secretion aldoste...