Secalciferol - CAS 55721-11-4
Catalog number: B0084-375020
Category: Inhibitor
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Secalciferol is a metabolite of Vitamin D, a possibly anti-inflammatory steroid which is involved in bone ossification. lt mediates calcium and phosphorus homeostasis and inhibits calcium channels in osteosarcoma cells via suppressing the effects of 1α, 25-dihydroxyvitamin D3 and testosterone. lt also can decrease the abundance of p53 and Pi-induced cytochrome c translocation.
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B0084-375020 1 mg $998 In stock
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(24R)-24,25-Dihydroxyvitamin D3
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1.Specificity of polyclonal antibodies raised against a novel 24,25-dihydroxyvitamin D3-bovine serum albumin conjugant linked through the C-11alpha or C-3 position.
Kobayashi N;Higashi T;Saito K;Murayama T;Douya R;Shimada K J Steroid Biochem Mol Biol. 1997 May;62(1):79-87.
Novel hapten-carrier conjugants were prepared by coupling 11 alpha-hemiglutaryloxy-(24R)-24,25-dihydroxyvitamin D3 or (24R)-24,25-dihydroxyvitamin D3 [24,25(OH)2D3] 3-hemiglutarate with bovine serum albumin (BSA), to obtain an antibody with high specificity and affinity for use in 24,25(OH)2D3 immunoassay. The polyclonal antibodies showing high titre were each elicited in three or four rabbits against these two conjugants; the antibodies obtained from the former and the latter conjugants were expressed as Ab11 and Ab3, respectively. These had a much higher affinity for 24,25(OH)2D3 than that of the vitamin D binding protein (DBP). Specificity of the antibodies was investigated by crossreactivities with 11 related compounds in a radioimmunoassay (RIA) system. The Abll well discriminated the 1 alpha-hydroxylated metabolites such as 1,24,25(OH)3D3 (< or = 0.69%) and 1,25(OH)2D3 (< or = 0.25%), but significantly crossreacted with some side chain modified compounds such as (24S)-24,25-dihydroxyvitamin D3 [24S,25(OH)2D3] (> or = 67%), 25(OH)D3 (> or = 14%) and 25,26(OH)2D3 (> or = 23%). On the other hand, the Ab3 showed only negligible crossreactivities with the compounds having a different side chain structure such as 24S,25(OH)2D3 (< or = 3.
2.Levels of 24,25-dihydroxyvitamin D3, 25-hydroxyvitamin D3 and 25-hydroxyvitamin D3 3-sulphate in human plasma.
Higashi T;Mitamura K;Ohmi H;Yamada N;Shimada K;Tanaka K;Honjo H Ann Clin Biochem. 1999 Jan;36 ( Pt 1):43-7.
The concentrations of (24R)-24,25-dihydroxyvitamin D3[24,25(OH)2D3], 25-hydroxyvitamin D3[25(OH)D3] and its 3-sulphate [25(OH)D3(3)S] in the plasma of healthy subjects, patients with chronic renal failure, patients with climacteric syndrome, pregnant women and foetuses were determined using the enzyme-linked immunosorbent assay and high-performance liquid chromatography. 25(OH)D3(3)S was not detected in about one-third of the plasma samples from patients with chronic renal failure (n = 26). The three metabolites in maternal plasma reached the highest levels in the second trimester of pregnancy followed by a decrease to the values obtained in the first trimester. Older healthy women (age range 44-71 years) showed higher levels of 24,25(OH)2D3 and 25(OH)D3 in the plasma than did young healthy women (age range 21-29 years), whereas no clear difference was observed between the older healthy women and patients with climacteric syndrome. The level of 25(OH)D3(3)S in the plasma was higher in the latter patients than in healthy women.
3.Measurement of mammalian 25-hydroxyvitamin D3 24R-and 1 alpha-hydroxylase.
Tanaka Y;DeLuca HF Proc Natl Acad Sci U S A. 1981 Jan;78(1):196-9.
An in vitro assay of mammalian 25-hydroxyvitamin D3 1 alpha- and 24R-hydroxylases in kidney has been developed. It had been suggested that 25-hydroxyvitamin D binding protein present in mammalian blood and tissues inhibits the enzyme activities in cell-free preparations by binding the substrate 25-hydroxyvitamin D3 more strongly than the hydroxylases bind it. This inhibitory effect is overcome by the addition of substantial amounts of unlabeled 25-hydroxyvitamin D3 to saturate the binding sites of this protein. The resulting metabolites produced in vitro by rat kidney homogenates were isolated and firmly identified by ultraviolet absorption spectrometry and mass spectrometry as 1,25-dihydroxyvitamin D3 and (24R)-24,25-dihydroxyvitamin D3. Maximal 1 alpha-hydroxylation of 25-hydroxyvitamin D3 could be demonstrated in kidney homogenates prepared from vitamin D-deficient rats. Thyroparathyroidectomy of these rats resulted in total suppression of the 1 alpha-hydroxylase. Homogenates of kidney from rats given vitamin D showed little or no 1 alpha-hydroxylase and substantial 24R-hydroxylase activity. Thyroparathyroidectomy of these rts markedly increased the 24R-hydroxylase activity.
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CAS 55721-11-4 Secalciferol

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