Ans) Vit D & Vit E are similar:
- The major biological function of vitamin D is to maintain normal blood levels of calcium and phosphorus. Vitamin D aids in the absorption of calcium, helping to form and maintain strong bones. To date, more than 500 studies support the role of vitamin D in immune health
- There is evidence that vitamin E (VE) has anti-inflammatory and analgesic properties in human osteoarthritis (OA).
- It was found that calcium exchange disturbances under vitamin E deficiency is due to changes in the metabolism of vitamin D. In vitamin E-deficient rats the serum blood levels of hydroxyvitamin D (25-OHD) showed no significant changes, whereas the concentration of the hormonal form of 1.25-hydroxyvitamin D [1.25(OH)2D], decreased by 40%. In vitro studies showed that the 25-hydroxylase D3 activity in the livers of rats with E-avitaminosis had a tendency to decrease (by 22%), whereas that of 24-hydroxylase dropped drastically (by 52%). The serum blood levels of the parathyroid hormone (PTH) and kidney levels of cAMP under E-avitaminosis were significantly lowered. Preincubation of kidney slices with the adenylate cyclase activator, forskolin, increased the activity of 1-OHase in about the same degree as that in vitamin E-rich rats. The free radical scavenger, BHT, added to kidney slices suppressed the activity of the both enzymes; this finding testifies to the low O2-binding affinity of these monooxygenases. The content of 1.25(OH)2D3 receptors occupied in vivo in the kidneys of vitamin E-deficient rats decreased 2.5-fold; however, the binding of 1.25(OH)2D3-receptor complexes to heterologous DNA was unaffected thereby. The vitamin deficiency in vivo results in the inhibition of vitamin D metabolism in the liver and kidney concomitant with the formation of active metabolites and decreases the concentration of hormone-receptor complexes in target tissues.
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16. Content question: What do vitamin D and vitamin C have in common?
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17. Content question: What do vitamin D and Riboflavin have in common?
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