Serum Concentrations of Calcium and Vitamin D Metabolites in Prosimians

1982 ◽  
Vol 11 (2) ◽  
pp. 85-90 ◽  
Author(s):  
T.K. Gray ◽  
G.E. Lester ◽  
G. Moore ◽  
D. Crews ◽  
E.L. Simons ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D Metabolites ◽  
Serum Concentrations

scholarly journals Vitamin D Metabolites and Clinical Outcome in Hospitalized COVID-19 Patients

Nutrients ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 2129
Author(s):  
Sieglinde Zelzer ◽  
Florian Prüller ◽  
Pero Curcic ◽  
Zdenka Sloup ◽  
Magdalena Holter ◽  
...  
Keyword(s):  
Vitamin D ◽  
Degradation Products ◽  
University Hospital ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
Serum Samples ◽  
Liquid Chromatography Tandem Mass ◽  
Relevant Role ◽  
Metabolite Ratio ◽  
The University

(1) Background: Vitamin D, a well-established regulator of calcium and phosphate metabolism, also has immune-modulatory functions. An uncontrolled immune response and cytokine storm are tightly linked to fatal courses of COVID-19. The present retrospective study aimed to inves-tigate vitamin D status markers and vitamin D degradation products in a mixed cohort of 148 hospitalized COVID-19 patients with various clinical courses of COVID-19. (2) Methods: The serum concentrations of 25(OH)D3, 25(OH)D2, 24,25(OH)2D3, and 25,26(OH)2D3 were determined by a validated liquid-chromatography tandem mass-spectrometry method in leftover serum samples from 148 COVID-19 patients that were admitted to the University Hospital of the Medical Uni-versity of Graz between April and November 2020. Anthropometric and clinical data, as well as outcomes were obtained from the laboratory and hospital information systems. (3) Results: From the 148 patients, 34 (23%) died within 30 days after admission. The frequency of fatal outcomes did not differ between males and females. Non-survivors were significantly older than survivors, had higher peak concentrations of IL-6 and CRP, and required mechanical ventilation more frequently. The serum concentrations of all vitamin D metabolites and the vitamin D metabolite ratio (VMR) did not differ significantly between survivors and non-survivors. Additionally, the need for res-piratory support was unrelated to the serum concentrations of 25(OH)D vitamin D and the two vitamin D catabolites, as well as the VMR. (4) Conclusion: The present results do not support a relevant role of vitamin D for the course and outcome of COVID-19.

scholarly journals Seasonal fluctuations in serum concentrations of vitamin D metabolites.

BMJ ◽  
1982 ◽  
Vol 284 (6310) ◽  
pp. 196-197 ◽  
Author(s):  
L Tjellesen ◽  
B Nielsen ◽  
C Christiansen
Keyword(s):  
Vitamin D ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
Seasonal Fluctuations

scholarly journals Serum and urine vitamin D metabolite analysis in early preeclampsia

2018 ◽  
Vol 7 (1) ◽  
pp. 199-210 ◽  
Author(s):  
J A Tamblyn ◽  
C Jenkinson ◽  
D P Larner ◽  
M Hewison ◽  
M D Kilby
Keyword(s):  
Vitamin D ◽  
Pregnant Women ◽  
Reproductive Age ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
Control Serum ◽  
Significant Difference ◽  
Paired Serum ◽  
In Pregnancy ◽  
Serum And Urine

Vitamin D deficiency is common in pregnant women and may contribute to adverse events in pregnancy such as preeclampsia (PET). To date, studies of vitamin D and PET have focused primarily on serum concentrations vitamin D, 25-hydroxyvitamin D3 (25(OH)D3) later in pregnancy. The aim here was to determine whether a more comprehensive analysis of vitamin D metabolites earlier in pregnancy could provide predictors of PET. Using samples from the SCOPE pregnancy cohort, multiple vitamin D metabolites were quantified by liquid chromatography–tandem mass spectrometry in paired serum and urine prior to the onset of PET symptoms. Samples from 50 women at pregnancy week 15 were analysed, with 25 (50%) developing PET by the end of the pregnancy and 25 continuing with uncomplicated pregnancy. Paired serum and urine from non-pregnant women (n = 9) of reproductive age were also used as a control. Serum concentrations of 25(OH)D3, 25(OH)D2, 1,25(OH)2D3, 24,25(OH)2D3 and 3-epi-25(OH)D3 were measured and showed no significant difference between women with uncomplicated pregnancies and those developing PET. As previously reported, serum 1,25(OH)2D3 was higher in all pregnant women (in the second trimester), but serum 25(OH)D2 was also higher compared to non-pregnant women. In urine, 25(OH)D3 and 24,25(OH)2D3 were quantifiable, with both metabolites demonstrating significantly lower (P < 0.05) concentrations of both of these metabolites in those destined to develop PET. These data indicate that analysis of urinary metabolites provides an additional insight into vitamin D and the kidney, with lower urinary 25(OH)D3 and 24,25(OH)2D3 excretion being an early indicator of a predisposition towards developing PET.

Evidence for an interaction of insulin and sex steroids in the regulation of vitamin D metabolism in the rat

1987 ◽  
Vol 115 (2) ◽  
pp. 295-301 ◽  
Author(s):  
B. L. Nyomba ◽  
R. Bouillon ◽  
P. De Moor
Keyword(s):  
Vitamin D ◽  
Diabetic Rats ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
Insulin Deficiency ◽  
Intact Male ◽  
Vitamin D Metabolism ◽  
Dihydroxyvitamin D ◽  
Androgen Withdrawal ◽  
Intact Rats

ABSTRACT Vitamin D metabolites and vitamin D-binding protein (DBP) were measured in non-diabetic rats and in rats made diabetic with streptozotocin. The animals were studied in the intact state, after gonadectomy and during pregnancy. In male non-diabetic rats the serum concentrations of 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) and DBP decreased after orchidectomy and were restored by treatment with testosterone. In female non-diabetic rats, these parameters increased after ovariectomy. Increased 1,25-(OH)2D3 and decreased DBP concentrations were found during pregnancy in non-diabetic rats. After the induction of diabetes in intact rats of both sexes, the concentration of DBP decreased, but a significant decrease in the concentration of 1,25-(OH)2D3 was found in male animals only. After ovariectomy, however, 1,25-(OH)2D3 decreased also in female diabetic rats. Both orchidectomy and insulin deficiency depressed serum concentrations of 1,25-(OH)2D3 (−22 and −45% respectively) and DBP (−14 and −29% respectively), but the effects of insulin deficiency were greater than those of androgen withdrawal. Moreover, the testosterone concentration was twofold lower in intact male diabetic rats than in non-diabetic animals. Insulin, but not testosterone treatment, however, restored DBP and 1,25-(OH)2D3 concentrations in diabetic rats, and insulin was effective in intact as well as in gonadectomized animals. This study shows that insulin deficiency decreases the concentrations of DBP and 1,25-(OH)2D3 in the rat, and that these decreases are facilitated by androgens, but counteracted by oestrogens. J. Endocr. (1987) 115, 295–301

Long-term therapy with cyclosporin a does not influence serum concentrations of vitamin D metabolites in humans

1992 ◽  
Vol 17 ◽  
pp. 106
Author(s):  
H. Reichel ◽  
A. Grüssinger ◽  
A. Knehans ◽  
K. Kühn ◽  
H. Schmidt-Gavk ◽  
...  
Keyword(s):  
Vitamin D ◽  
Cyclosporin A ◽  
Term Therapy ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
Long Term Therapy

Calcidiol, Calcitriol and Parathyroid Hormone Serum Concentrations in Institutionalized and Ambulatory Elderly in Switzerland

1999 ◽  
Vol 69 (2) ◽  
pp. 96-105 ◽  
Author(s):  
Theiler ◽  
Stähelin ◽  
Tyndall ◽  
Binder ◽  
Somorjai ◽  
...  
Keyword(s):  
Vitamin D ◽  
Parathyroid Hormone ◽  
Vitamin D Deficiency ◽  
Elderly People ◽  
Elderly Subjects ◽  
Bone Resorption Marker ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
Institutionalized Elderly ◽  
Serum Ipth

Aim: The aim of the present study was to measure concentrations of vitamin D metabolites and intact parathyroid hormone (iPTH) serum concentrations and an urinary bone resorption marker in two groups of elderly subjects, who differed markedly in their sedentary status and seasonality. Design: 193 institutionalized elderly people of a long-stay geriatric ward (106 women: mean age 82; 87 men: mean age 78) were studied during wintertime. 312 ambulatory elderly people (109 women: mean age 74; 203 men: mean age 76) were studied during summertime. Concentrations of calcidiol (25(OH)D), calcitriol (1,25(OH)2D) and serum iPTH, as well as urinary N-telopeptides (NTX) were measured. Results: Vitamin D deficiency (defined as serum 25(OH)D < 12 ng/ml) was present in 86% of institutionalized at the expected nadir (wintertime), compared to 15% of the ambulatory elderly subjects at the expected maximum (summertime). Serum calcitriol concentrations were significantly lower in institutionalized subjects (p = .0001). However intact PTH concentrations did not differ significantly between institutionalized and ambulatory elderly. Institutionalized and female subjects showed higher urinary NTX excretion (female institutionalized: 131.9; female ambulatory: 66.8/male institutionalized: 76.3 male ambulatory: 45.8 nmol/mmol). Conclusion: This cross-sectional study documented very low serum calcidiol and calcitriol concentrations and high urinary N-telopeptide excretion in institutionalized elderly people. There was no difference in serum iPTH concentrations between institutionalized and ambulatory elderly. This finding could not be explained by the differences in calcidiol and calcitriol concentration, nor urinary NTX excretion. These results suggest that other factors than vitamin D deficiency, such as lower mobility status and sedentary life style, might have an important role in the regulation of iPTH and mechanisms of bone loss in the elderly.

Serum Concentrations of Vitamin D Metabolites in Exclusively Breast-Fed Infants at 70° North

1984 ◽  
Vol 73 (1) ◽  
pp. 29-32 ◽  
Author(s):  
T. MARKESTAD ◽  
S. KOLMANNSKOG ◽  
E. ARNTZEN ◽  
L. TOFTEGAARD ◽  
B. HANEBERG ◽  
...  
Keyword(s):  
Vitamin D ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
Breast Fed

Serum Concentrations of Vitamin D Metabolites in Rachitic Libyan Children

1989 ◽  
Vol 9 (4) ◽  
pp. 507-512 ◽  
Author(s):  
Abdelaziz Y. Elzouki ◽  
Trond Markestad ◽  
Maha Elgarrah ◽  
Neama Elhoni ◽  
Lage Aksnes
Keyword(s):  
Vitamin D ◽  
Vitamin D Metabolites ◽  
Serum Concentrations

Vitamin D Metabolism in Patients Intoxicated with Ergocalciferol

1985 ◽  
Vol 68 (2) ◽  
pp. 135-141 ◽  
Author(s):  
E. Barbara Mawer ◽  
J. T. Hann ◽  
Jacqueline L. Berry ◽  
M. Davies
Keyword(s):  
Vitamin D ◽  
Serum Calcium ◽  
Calcium Concentration ◽  
Mass Action ◽  
Vitamin D Metabolites ◽  
Serum Concentrations ◽  
High Concentration ◽  
Vitamin D Metabolism ◽  
Serum Calcium Concentration ◽  
Per Se

1. Vitamin D metabolites were measured on admission in eight patients intoxicated with ergocalciferol (serum calcium 3.01-4.05 mmol/l) and also during the subsequent 2 months in six of the eight. 2. Serum concentrations of 25-hydroxyergocalciferol, on admission, were grossly elevated in all patients (range 583-1843 nmol/l). 3. Serum calcium concentration was related significantly only to the concentration of 25-hydroxyergocalciferol (P = 0.003). 4. Concentrations of 25-hydroxyergocalciferol in serum were significantly related to those of calciferol (P = 0.004). 5. Elevated initial concentrations of 1,25-dihydroxycalciferol, mainly as 1,25-dihydroxyergocalciferol, were found in seven of the eight patients (range 179-313 pmol/l). 6. It is suggested that the hypercalcaemia in these patients may be explained by the action of 25-hydroxyergocalciferol at high concentration in competing for 1,25-dihydroxycalciferol receptors, thus exerting a biological effect per se, and also by increasing the synthesis of 1,25-dihydroxycalciferol through a mass-action effect on the renal 1α-hydroxylase.

Sign in / Sign up

Export Citation Format

Share Document