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Pathway Description
Aldosterone from Steroidogenesis
Homo sapiens
Physiological Pathway
Created: 2019-03-25
Last Updated: 2023-10-12
Aldosterone is a hormone produced in the zona glomerulosa of the adrenal cortex. It's function is to act on the distal convoluted tubule and the collecting duct of the nephron to make them more permeable to sodium to allow for its reuptake (in addition to allowing potassium wasting). As a result, water follows the sodium back into the body. The water retention contributes to an increased blood volume. Angiotensin II from the circulation binds to receptors on the zona glomerulosa cell membrane, activating the G protein and triggering a signaling cascade. The end result is the activation of the steroidogenic acute regulatory (StAR) protein that permits cholesterol uptake into the mitochondria. From there, cholesterol undergoes a series of reactions in both the mitochondrion and the smooth endoplasmic reticulum (steroidogenesis) where it finally becomes aldosterone.
References
Aldosterone from Steroidogenesis References
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