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Calcitriol is a hormone and the active form of vitamin D, normally made in the kidney. [8] [9] [10] It is also known as 1,25-dihydroxycholecalciferol.It binds to and activates the vitamin D receptor in the nucleus of the cell, which then increases the expression of many genes. [11]
[4]: 100–101, 371–379 [5] [33] The prevalence of vitamin D deficiency increases with age due to a decrease in 7-dehydrocholesterol synthesis in the skin and a decline in kidney capacity to convert calcidiol to calcitriol, [34] the latter seen to a greater degree in people with chronic kidney disease. [35]
Vitamin D (the inactive version) is mainly from two forms: vitamin D 3 and vitamin D 2. Vitamin D 3, or cholecalciferol, is formed in the skin after exposure to sunlight or ultra violet radiation or from D 3 supplements or fortified food sources. Vitamin D 2, or ergocalciferol, is obtained from D 2 supplements or fortified food sources. [3]
“We know that vitamin D deficiency and low calcium diet increases the risk of bone ... and immune cells and gets metabolized by the liver and kidney. A main function of vitamin D is calcium ...
Despite its name, vitamin D is not a vitamin but a hormone or prohormone. An adequate intake of vitamin D may support good immune function and reduce the risk of autoimmune diseases.
CYP24A1 is expressed in tissues which are considered targets for vitamin D, including kidney, intestine and bone. Transcription of the CYP24A1 gene is markedly inducible by 1,25-(OH) 2 D 3 binding to the vitamin D receptor. [6] The gene has a strong, positive vitamin D response element in the promoter.