• MeSH
• 25-hydroxyvitamin D 2 * analýza   MeSH
• biochemická analýza krve metody   MeSH
• imunoanalýza * metody   MeSH
• kalcifediol * analýza   MeSH
• lidé MeSH
• protein vázající vitamin D analýza   MeSH
• vitamin D metabolismus   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• srovnávací studie MeSH

CONTEXT: Low serum 25-hydroxyvitamin D is a risk factor for osteoporosis, cardiovascular disease, diabetes, and cancer. Disruption of noncholesterol sterol absorption due to cholesterol-lowering therapies may result in reduced fat-soluble vitamin absorption. OBJECTIVE: We have previously reported on the cholesterol-lowering efficacy and reduced sterol absorption of probiotic bile salt hydrolase active Lactobacillus reuteri NCIMB 30242; however, the effects on fat-soluble vitamins was previously unknown and the objective of the present study. DESIGN, SETTINGS, PATIENTS, AND INTERVENTION: The study was double-blind, placebo-controlled, randomized, parallel-arm, multicenter lasting 13 weeks. A total of 127 otherwise healthy hypercholesterolemic adults with low-density lipoprotein-cholesterol >3.4 mmol/L, triglycerides <4.0 mmol/L, and body mass index of 22 to 32 kg/m² were included. Subjects were recruited from 6 private practices in Prague, Czech Republic, and randomized to consume L. reuteri NCIMB 30242 or placebo capsules over a 9-week intervention period. OUTCOME MEASURES: The primary outcome measure was the change in serum low-density lipoprotein-cholesterol over the 9-week intervention. Analysis of fat-soluble vitamins at weeks 0 and 9 were performed post hoc. RESULTS: There were no significant differences between L. reuteri NCIMB 30242 and placebo capsule groups in serum vitamin A, vitamin E, or β-carotene or dietary intake over the intervention period (P > .05). L. reuteri NCIMB 30242 increased serum 25-hydroxyvitamin D by 14.9 nmol/L, or 25.5%, over the intervention period, which was a significant mean change relative to placebo of 17.1 nmol/L, or 22.4%, respectively (P = .003). CONCLUSIONS: To our knowledge, this is the first report of increased circulating 25-hydroxyvitamin D in response to oral probiotic supplementation.

• MeSH
• 25-hydroxyvitamin D 2 krev   MeSH
• amidohydrolasy škodlivé účinky   metabolismus   MeSH
• anticholesteremika škodlivé účinky   terapeutické užití   MeSH
• bakteriální proteiny škodlivé účinky   metabolismus   MeSH
• dospělí MeSH
• dvojitá slepá metoda MeSH
• hypercholesterolemie krev   dietoterapie   MeSH
• intestinální absorpce MeSH
• kalcifediol krev   MeSH
• LDL-cholesterol krev   MeSH
• lidé středního věku MeSH
• lidé MeSH
• Limosilactobacillus reuteri enzymologie   metabolismus   MeSH
• mladý dospělý MeSH
• nedostatek vitaminu D etiologie   prevence a kontrola   MeSH
• probiotika škodlivé účinky   terapeutické užití   MeSH
• senioři MeSH
• vitamin D metabolismus   MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• multicentrická studie MeSH
• práce podpořená grantem MeSH
• randomizované kontrolované studie MeSH
• Geografické názvy
• Česká republika MeSH

Cieľ: Cieľom štúdie bolo porovnať 3 rutinné imunochemické metódy stanovenia celkového 25-hydroxy-vitamínu D [25-(OH) D] s vysokoúčinnou kvapalinovou chromatografiou s UV detekciou. Materiál a metódy: Sérové hladiny 25-(OH) D boli stanovované u 109 pacientov rôznymi imunochemickými metódami (ABBOTT, ROCHE, SIEMENS) a metódou HPLC, ktorá bola v predkladanej práci považovaná za referenčnú. V prvom kroku boli vybrané imunochemické metódy porovnané s ohľadom na metódu HPLC. V druhom kroku boli tieto metódy porovnané navzájom medzi sebou. Na porovnanie metód bola použitá regresná analýza (Passing-Bablok) a Bland-Altmanova analýza diferencií. Za maximálne akceptovateľné diferencie v jednotlivých výsledkoch boli považované hodnoty v rozmedzí ? 21,5 %. Toto kritérium bolo zvolené na základe CDC Vitamin D Standardization-Certification Program (VDSCP). V poslednom kroku bola vyhodnotená miera zhody v interpretácii nameraných výsledkov 25-(OH) D. Výsledky: Žiadna zo skúmaných imunochemických metód stanovenia 25-(OH) D nebola porovnateľná s metódou HPLC a takisto neboli porovnateľné navzájom medzi sebou. Bland-Atlmanova analýza odhalila, v porovnaní s HPLC, že metóda ROCHE vykazuje bias +28,0 %, metóda ABBOTT +0,2 % a metóda Siemens -23,4 %. Priemerný bias u metódy ABBOTT je síce nevýznamný, avšak jednotlivé výsledky vykazovali bias v rozmedzí -89,4 % až 89,0 %. V porovnaní s metódou HPLC bola miera zhody v klinickej interpretácii výsledkov u metódy ABBOTT 65,21 %, ROCHE 59,63 % a SIEMENS 47,79 %. Záver: Výsledky predkladanej práce poukazujú na slabú úroveň štandardizácie metód stanovenia 25-(OH) D, ako aj na možnosť zvážiť používanie na metóde závislých rozhodovacích limitov.

Objective: The aim of proposed paper was to compare a three total 25-hydroxy-vitamin D immunoassays to that of HPLC with UV detection. Material and methods: Serum 25-(OH) D levels were measured from blood samples of 109 patients with different immunoassays (ABBOTT, ROCHE, SIEMENS) and method of HPLC which was chosen as the reference. In the first step immunoassays were compared to HPLC. In the second step immunoassays were compared to each other. Further purpose of methods comparison the Passing-Bablok regression and Bland-Altman analysis were used. The limits of maximum acceptable differences were set at 21.5 %, according to Vitamin D Standardization-Certification Program (VDSCP). In the last step, the concordance in the interpretation of measured results was evaluated. Results: None of the examined 25-(OH) D immunoassays was comparable to HPLC and to each other. Bland-Altman analysis revealed, in comparison to HPLC, that ROCHE showed positive bias +28.0 %, ABBOTT +0.2 % and SIEMENS –23.4 %. Although average bias of ABBOTT immunoassay is insignificant, particular results do deviate significantly (-89.4 % to 89.0 %). The concordance in the interpretation of measured results, in comparison to HPLC, was highest with ABBOTT (65.21 %), then with ROCHE (59.63 %) and lowest with SIEMENS (47.79 %). Conclusion: The results of the proposed papers suggest low levels of 25-(OH) D immunoassays standardization and an alternative to use assay-specific decision limits.

• MeSH
• 25-hydroxyvitamin D 2 krev   MeSH
• dospělí MeSH
• falešně negativní reakce MeSH
• imunoanalýza * MeSH
• kalcifediol krev   MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• nedostatek vitaminu D * krev   MeSH
• reagenční diagnostické soupravy MeSH
• referenční standardy MeSH
• regresní analýza MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• vitamin D analogy a deriváty   krev   MeSH
• vysokoúčinná kapalinová chromatografie * MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• srovnávací studie MeSH

• MeSH
• 25-hydroxyvitamin D 2 analýza   MeSH
• klinické laboratorní techniky metody   přístrojové vybavení   MeSH
• kompetitivní vazba MeSH
• luminiscenční měření metody   přístrojové vybavení   MeSH
• radioimunoanalýza metody   přístrojové vybavení   MeSH
• senzitivita a specificita MeSH
• vazba proteinů MeSH

Vitamin D is synthesised in the skin during exposure to sunlight and its fundamental roles are the regulation of calcium and phosphate metabolism and bone mineralisation. The aim of our study was to evaluate serum levels of 25-hydroxyvitamin D3, PTH and bone turnover markers (P1NP, OC, beta-CTx, OC/beta-CTx) and the intake of calcium and vitamin D in Polish Professional Football League (Ekstraklasa) players and in young men with a low level of physical activity. Fifty healthy men aged 19 to 34 years were included in the study. We showed that 25(OH)D3 and P1NP levels and OC/beta-CTx were higher in the group of professional football players than in the group of physically inactive men. The daily vitamin D and calcium intake in the group of professional football players was also higher. We showed a significant relationship between 25(OH)D3 levels and body mass, body cell mass, total body water, fat-free mass, muscle mass, vitamin D and calcium intake. Optimum 25(OH)D3 levels were observed in a mere 16.7% of the football players and vitamin D deficiency was observed in the physically inactive men. The level of physical activity, body composition, calcium and vitamin D intake and the duration of exposure to sunlight may significantly affect serum levels of 25(OH)D3.

• MeSH
• dospělí MeSH
• fotbal fyziologie   MeSH
• kalcifediol krev   MeSH
• kostní denzita fyziologie   MeSH
• lidé MeSH
• mladý dospělý MeSH
• nedostatek vitaminu D krev   diagnóza   MeSH
• pohybová aktivita fyziologie   MeSH
• remodelace kosti fyziologie   MeSH
• sedavý životní styl * MeSH
• Check Tag
• dospělí MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• hodnotící studie MeSH

Vitamin D, either in its D2 or D3 form, is essential for normal human development during intrauterine life, kidney function and bone health. Vitamin D deficiency has also been linked to cancer development and some autoimmune diseases. Given this huge impact of vitamin D on human health, it is important for daily clinical practice and clinical research to have reliable tools to judge on the vitamin D status. The major circulating form of vitamin D is 25-hydroxyvitamin D (25(OH)D), although it is not the most active metabolite, the concentrations of total 25-hydroxyvitamin D in the serum are currently routinely used in clinical practice to assess vitamin D status. In the circulation, vitamin D - like other steroid hormones - is bound tightly to a special carrier - vitamin D-binding protein (DBP). Smaller amounts are bound to blood proteins - albumin and lipoproteins. Only very tiny amounts of the total vitamin D are free and potentially biologically active. Currently used vitamin D assays do not distinguish between the three forms of vitamin D - DBP-bound vitamin D, albumin-bound vitamin D and free, biologically active vitamin D. Diseases or conditions that affect the synthesis of DBP or albumin thus have a huge impact on the amount of circulating total vitamin D. DBP and albumin are synthesized in the liver, hence all patients with an impairment of liver function have alterations in their total vitamin D blood concentrations, while free vitamin D levels remain mostly constant. Sex steroids, in particular estrogens, stimulate the synthesis of DBP. This explains why total vitamin D concentrations are higher during pregnancy as compared to non-pregnant women, while the concentrations of free vitamin D remain similar in both groups of women. The vitamin D-DBP as well as vitamin D-albumin complexes are filtered through the glomeruli and re-uptaken by megalin in the proximal tubule. Therefore, all acute and chronic kidney diseases that are characterized by a tubular damage, are associated with a loss of vitamin D-DBP complexes in the urine. Finally, the gene encoding DBP protein is highly polymorphic in different human racial groups. In the current review, we will discuss how liver function, estrogens, kidney function and the genetic background might influence total circulating vitamin D levels and will discuss what vitamin D metabolite is more appropriate to measure under these conditions: free vitamin D or total vitamin D.

• MeSH
• biologické markery krev   MeSH
• lidé MeSH
• nedostatek vitaminu D krev   diagnóza   MeSH
• protein vázající vitamin D metabolismus   MeSH
• vitamin D analogy a deriváty   krev   MeSH
• vitaminy krev   MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH

OBJECTIVE: To assess the decrease in serum calcitriol concentrations after hip fracture. METHODS: Serum concentrations of calcitriol, 25(OH)D, parathyroid hormone (PTH), directly measured free 25(OH)D, and indices of bone formation were measured in elderly patients with hip fracture (HF) and patients with elective hip replacement (EHR) at admission and after 7 weeks. RESULTS: A total of 45 patients with HF and 17 patients with EHR completed this prospective study. Baseline serum calcitriol levels were ≤ 60 pmol/l in 26% of the HF patients. After 7 weeks, they significantly decreased (p < 0.001). In patients with EHR, serum calcitriol was within the reference range in all but one patient and did not change during the 7-week recovery phase. Seven weeks after HF, a significant positive relationship was observed between the change in calcitriol and serum 25(OH)D concentration (r = 0.385, p = 0.009) and free 25(OH)D (r = 0.296, p = 0.048), and a decrease in calcitriol during recovery was associated with a decrease in serum PTH (p = 0.038). Seven weeks after HF, changes in both serum PTH and serum 25(OH)D concentrations contributed to the prediction of changes in serum calcitriol (R2 = 0.190, p = 0.012). CONCLUSIONS: Unlike patients with EHR, subjects with HF had low serum 25(OH)D and low free 25(OH)D concentrations at admission, while their serum 1,25D levels were relatively elevated. Decreases in circulating calcitriol levels in the 7 weeks following hip surgery were associated with a resolution of secondary hyperparathyroidism and low availability of free 25(OH)D.

• MeSH
• fraktury kyčle krev   MeSH
• hojení fraktur fyziologie   MeSH
• kalcitriol krev   MeSH
• lidé MeSH
• náhrada kyčelního kloubu MeSH
• osteogeneze MeSH
• parathormon krev   MeSH
• prospektivní studie MeSH
• referenční hodnoty MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• vitamin D analogy a deriváty   krev   MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• senioři nad 80 let MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

OBJECTIVES: The primary objective was to determine levels of C3-epi-25(OH)D in very low birth weight infants. The secondary objective was to evaluate the possible influence of preterm birth, intrauterine growth restriction (IUGR), and season of birth on the production of C3-epimers. METHODS: A total of 127 infants with birth weight less than 1,500 g met the inclusion criteria of the study. We examined 25-hydroxyvitamin-D [25(OH)D] levels and C3-epi-25(OH)D in maternal serum before labor, and in cord blood and infants' serum on days 14 and 28, and at discharge. RESULTS: The mean levels (±SD) of C3-epi-25(OH)D of the cord, on day 14, on day 28, and at discharge were 2.2 (2.9), 7.7 (5.5), 11.7 (7.6) and 14.9 (11.7) nmol/L respectively. The proportion of total 25(OH)D as the C3-epimer was 6.9% (cord), 16.3% (day 14), 22.4% (day 28) and 23.3% (discharge). A statistically significant correlation between 25(OH)D and C3-epi-25(OH)D can be demonstrated from birth. The severity of immaturity and IUGR did not affect the production of C3-epimers. In summer/autumn vs. winter/spring, the mean (SD) percentage of total 25(OH)D as the C3-epimer significantly differs only in maternal serum samples and umbilical cord samples (p value <0.001). CONCLUSIONS: The production of C3-epi-25(OH)D is functional even in the most immature newborns, has fetal origins, and is largely dependent on circulating 25(OH)D. At the end of the first month of life, C3-epimers make up more than 20% of 25(OH)D.

• MeSH
• kalcifediol MeSH
• kojenec MeSH
• lidé MeSH
• nedostatek vitaminu D * MeSH
• novorozenec nedonošený MeSH
• novorozenec s velmi nízkou porodní hmotností MeSH
• novorozenec MeSH
• předčasný porod * MeSH
• vitamin D MeSH
• vitaminy MeSH
• Check Tag
• kojenec MeSH
• lidé MeSH
• novorozenec MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

BACKGROUND/OBJECTIVE: Optimal vitamin D levels are required for bone health and proper functionality of the nervous, musculoskeletal and immune systems. The objective of this study was to assess the efficacy and safety profiles of new weekly calcifediol formulations with the potential to improve adherence and outcome. METHODS: A Phase II-III, double-blind, randomized, multicentre trial (EudraCT 2020-001099-14 and NCT04735926). Subjects were randomized 2:2:1 to calcifediol 75 μg, 100 μg and placebo. 25(OH)D levels were measured at 4, 16, 24, 32 and 52 weeks. The main outcome was the percentage of subjects who achieved a response defined as 25(OH)D levels ≥20 ng/mL and/or ≥30 ng/mL at week 16. RESULTS: 398 subjects (51.1 ± 15.96 years, 74.2% females, 98.7% Caucasian) with plasma 25(OH)D levels between 10 and 20 ng/mL were randomized. A total of 376 subjects completed 16 weeks of treatment, and 355 subjects completed the study. Six patients withdrew due to an adverse event, all unrelated to treatment. At week 16, 93.6% and 74.4% of subjects receiving calcifediol 75 μg achieved response levels of ≥20 ng/mL and ≥30 ng/mL, respectively. The calcifediol 100 μg group showed 98.7% and 89.9% of responders for ≥20 ng/mL and ≥30 ng/mL, respectively. Both calcifediol groups showed superiority over placebo at each response level at all time points analyzed (p < 0.0001). Calcifediol treatments increased 25(OH)D levels from baseline to week 24 and remained stable thereafter. The frequency of treatment-emergent adverse events was balanced between groups. CONCLUSIONS: New weekly calcifediol 75 and 100 μg formulations showed an effective and sustained response with a good long-term safety profile.

• MeSH
• dospělí MeSH
• dvojitá slepá metoda MeSH
• kalcifediol * krev   aplikace a dávkování   MeSH
• lidé středního věku MeSH
• lidé MeSH
• nedostatek vitaminu D * farmakoterapie   krev   MeSH
• potravní doplňky MeSH
• senioři MeSH
• vitamin D krev   analogy a deriváty   aplikace a dávkování   MeSH
• výsledek terapie MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• klinické zkoušky, fáze II MeSH
• klinické zkoušky, fáze III MeSH
• multicentrická studie MeSH
• randomizované kontrolované studie MeSH

• Klíčová slova
• Roche Vitamin D total,
• MeSH
• diagnostické vybavení statistika a číselné údaje   MeSH
• klinické laboratorní techniky přístrojové vybavení   MeSH
• lidé MeSH
• luminiscenční měření přístrojové vybavení   MeSH
• protein vázající vitamin D chemie   MeSH
• statistika jako téma MeSH
• vitamin D krev   MeSH
• Check Tag
• lidé MeSH