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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 ]
Calcitonin is a polypeptide hormone of 32 amino acids, with a molecular weight of 3454.93 daltons. Its structure comprises a single alpha helix. [40] Alternative splicing of the gene coding for calcitonin produces a distantly related peptide of 37 amino acids, called calcitonin gene-related peptide (CGRP), beta type. [41]
The low levels of PTH also inhibit the formation of calcitriol (not to be confused with calcitonin) from cholecalciferol (vitamin D 3) by the kidneys. The reduction in the blood calcitriol concentration acts (comparatively slowly) on the epithelial cells ( enterocytes ) of the duodenum, inhibiting their ability to absorb calcium from the ...
Calcitriol: secosteroid (1,25-dihydroxyvitamin D 3) skin/proximal tubule of kidneys: VDR: Active form of vitamin D 3. Increase absorption of calcium and phosphate from gastrointestinal tract and kidneys inhibit release of PTH. Calcidiol: secosteroid (25-hydroxyvitamin D 3) skin/proximal tubule of kidneys: VDR: Inactive form of vitamin D 3
Calcitriol plays a key role in regulating vitamin D levels through a negative feedback mechanism. [208] It strongly upregulates the expression of the enzyme CYP24A1 , which inactivates vitamin D. This activation happens through binding of the activated vitamin D receptor (VDR) to two vitamin D response elements (VDREs) in the CYP24A1 gene.
Calcitriol, the active form of vitamin D 3, promotes absorption of calcium from the intestines and bones. Calcitonin secreted from the parafollicular cells of the thyroid gland also affects calcium levels by opposing parathyroid hormone; however, its physiological significance in humans is dubious.
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[11] [12] It follows that an increase in vitamin D 3 intake should lead to a decrease in bone resorption — it has been shown that oral administration of vitamin D does not linearly correlate to increased serum levels of calcifediol, [13] the precursor to calcitriol. Calcitonin is a hormone secreted by the thyroid in humans.
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