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Hyperkalemia can occur following an overdose of spironolactone, and this is especially so in people with decreased kidney function. [8] Spironolactone has been studied at extremely high oral doses of up to 2,400 mg per day in clinical trials. [107] [168] Its oral median lethal dose (LD 50) is more than 1,000 mg/kg in mice, rats, and rabbits. [8]
Spironolactone and Eplerenone competitively block the binding of aldosterone to the mineralocorticoid receptor and hindering the reabsorption of sodium and chloride ions. The activity of mineralocorticoid antagonists is dependent on the presence of a y-lactone ring on the C-17 position.
Spironolactone has been identified as an inhibitor of NRG1‐ERBB4 signaling. [142] Spironolactone has been found to act as a potent inhibitor of the pannexin 1 channel, and this action appears to be involved in its antihypertensive effects independently of MR antagonism. [143] Spironolactone has been found to block hERG channels. [144]
The mineralocorticoid receptor (or MR, MLR, MCR), also known as the aldosterone receptor or nuclear receptor subfamily 3, group C, member 2, (NR3C2) is a protein that in humans is encoded by the NR3C2 gene that is located on chromosome 4q31.1-31.2. [5] MR is a receptor with equal affinity for mineralocorticoids and glucocorticoids.
Spirolactones are a class of functional group in organic chemistry featuring a cyclic ester attached spiro to another ring system. The name is also used to refer to a class of synthetic steroids, called steroid-17α-spirolactones, 17α-spirolactosteroids, or simply 17α-spirolactones, which feature their spirolactone group at the C17α position.
Aldosterone antagonists, also known as mineralocorticoid receptor antagonists: [7] Spironolactone – most widespread use, inexpensive; Eplerenone – more selective so reduced side-effects but more expensive and less potent; Finerenone – non-steroidal, more selective and potent than spironolactone and eplerenone; Canrenone – very limited use
Spironolactone has become a standard therapy for reducing mortality and morbidity in patients with severe heart failure with reduced ejection fraction. [ 2 ] [ 3 ] The RALES trial has then paved the way for further studies on the role of aldosterone antagonists in heart failure and other cardiovascular conditions.
Another example is spironolactone, a potassium-sparing diuretic of the steroidal spirolactone group, which interferes with the aldosterone receptor (among others) leading to lower blood pressure by the mechanism described above. Aldosterone was first isolated by Sylvia Tait (Simpson) and Jim Tait in 1953; in collaboration with Tadeusz Reichstein.
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