Calcitriol - CAS 32222-06-3
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Not Intended for Therapeutic Use. For research use only.
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Calcitriol is the hormonally active form of vitamin D.
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RO215535, Topitriol
1.1,25-Dihydroxyvitamin D3 inhibits the proliferation of thyroid cancer stem-like cells via cell cycle arrest.
Peng W1, Wang K1, Zheng R1, Derwahl M1. Endocr Res. 2016 Mar 30:1-8. [Epub ahead of print]
BACKGROUND: An anti-proliferative effect of vitamin D has been reported in different carcinomas, including thyroid cancer. Cancer stem cells (CSCs), a very small fraction of cancer cells, are widely believed to be responsible for cancer initiation, relapse and metastasis.
2.Successful Conversion From Parenteral Paricalcitol to Pulse Oral Calcitriol for the Management of Secondary Hyperparathyroidism in Hemodialysis Patients.
Kumar J1, Tran NG1, Schomberg J1, Streja E1, Kalantar-Zadeh K1, Pahl M2. J Ren Nutr. 2016 Mar 30. pii: S1051-2276(16)00045-5. doi: 10.1053/j.jrn.2016.02.006. [Epub ahead of print]
OBJECTIVE: The management of hyperparathyroidism in hemodialysis patients involves the administration of phosphate binders, vitamin D receptor activators, and calcimimetics. Intravenous paricalcitol has been preferred over oral calcitriol as it may cause less hypercalcemia and hyperphosphatemia. However, there is little data looking at the efficacy and tolerability of oral calcitriol in the calcimimetic era particularly in a real practice-based experience. The University of California, Irvine free-standing dialysis center converted from routine intravenous paricalcitol to oral calcitriol due to pharmacy purchasing preferences. We report the efficacy, safety, and cost of such a change.
3.Genetic Disorders Of Vitamin D Biosynthesis and Degradation.
Miller WL1. J Steroid Biochem Mol Biol. 2016 Apr 6. pii: S0960-0760(16)30097-8. doi: 10.1016/j.jsbmb.2016.04.001. [Epub ahead of print]
Vitamin D, an inactive secosteroid pro-hormone, is produced by the action of ultraviolet light on 7-dehydrocholesterol in the skin. The active hormone, 1,25(OH)2D is produced by sequential 25-hydroxylation in the liver, principally by CYP2R1, and 1α-hydroxylation in the kidney by CYP27B1. Mutations in CYP27B1 cause 1α-hydroxylase deficiency, also known as vitamin D dependent rickets type I or hereditary pseudo-vitamin D deficient rickets; very rare mutations in CYP2R1 can cause 25-hydroxylase deficienccy. Both deficiencies cause hypocalcemia, secondary hyperparathyroidism, severe rickets in infancy, and low serum concentrations of 1,25(OH)2D; both disorders respond to hormonal replacement therapy with calcitriol. The inactivation of vitamin D is principally initiated by its 23- and 24-hydroxylation by CYP24A1. Mutations in CYP24A1 can cause both severe neonatal hypercalcemia and a less severe adult hypercalcemic syndrome. Other pathways of vitamin D metabolism are under investigation, notably its 20-hydroxylation by the cholesterol side-chain cleavage enzyme, CYP11A1.
4.The Significance of Ultrasound in Determining Whether SHPT Patients Are Sensitive to Calcitriol Treatment.
Liang XX1, Li F2, Gao F2, Li CX2, Qiao XH2, Zhang JJ2, Du LF2. Biomed Res Int. 2016;2016:6193751. doi: 10.1155/2016/6193751. Epub 2016 Feb 29.
This study was to explore the significance of ultrasound in determining whether the patients with secondary hyperparathyroidism (SHPT) are sensitive to calcitriol treatment. According to the decrease value of parathyroid hormone (PTH), 42 SHPT patients were divided into two groups: drug susceptible group and drug insusceptible group. These 42 SHPT patients' ultrasound images were retrospectively analyzed. The morphology, size, number, blood flow, elastic modulus, and perfusion of the parathyroid glands were correlated with drug therapeutic outcome (oral calcitriol). Most SHPT patients with drug susceptible showed volume <438.50 mm(3) and number ≤2, with 0-1 structural and vascular patterns, associated with Relative Maximum Intensity (RIMAX) <1.59 and elastic modulus <18.8 kPa, whereas most SHPT patients with drug insusceptible showed volume ≥438.50 mm(3) and number ≥3, with 2-3 structural and vascular patterns, associated with Relative Maximum Intensity (RIMAX) ≥1.
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CAS 32222-06-3 Calcitriol

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