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Angiotensin II is the major bioactive product of the renin–angiotensin system, binding to receptors on intraglomerular mesangial cells, causing these cells to contract along with the blood vessels surrounding them; and to receptors on the zona glomerulosa cells, causing the release of aldosterone from the zona glomerulosa in the adrenal cortex.
Vitamin D inhibits renin secretion and its activity, it therefore acts as a "negative endocrine regulator of the renin–angiotensin system". Hence, a deficiency in vitamin D leads to an increase in renin secretion. This is one possible mechanism of explaining the observed link between hypertension and vitamin D levels in the blood plasma. [32]
Changes in renin ultimately alter the output of this system, principally the hormones angiotensin II and aldosterone. Each hormone acts via multiple mechanisms, but both increase the kidney's absorption of sodium chloride , thereby expanding the extracellular fluid compartment and raising blood pressure.
Taking a dose of 3,320 International Units (IU) of vitamin D per day was associated with benefits such as blood pressure, cholesterol, and fasting blood glucose, according to a meta-study.
Taking too much vitamin D can be toxic in rare cases, as with an 89-year-old U.K. man who died in March in part from vitamin D toxicity (though he did have several underlying conditions).
Unlike the other twelve vitamins, vitamin D is only conditionally essential - in a preindustrial society people had adequate exposure to sunlight and the vitamin was a hormone, as the primary natural source of vitamin D was the synthesis of cholecalciferol in the lower layers of the skin's epidermis, triggered by a photochemical reaction with ...