scholarly journals Laboratory Parameters of Bone Metabolism in Premature Infants and Children Born Using In Vitro Fertilization

2021 ◽  
Vol 20 (6) ◽  
pp. 103-110
Author(s):  
Natalya A. Natalya A. Druzhinina ◽  
Dinara R. Merzlyakova ◽  
Gulnaz A. Vakhitova ◽  
Zilia А. Shangareeva ◽  
Aliya R. Khabibullina ◽  
...  
Keyword(s):  
Vitamin D ◽  
Parathyroid Hormone ◽  
Bone Metabolism ◽  
Vitamin D Deficiency ◽  
Premature Infants ◽  
Type I Collagen ◽  
Plasma Vitamin ◽  
Type I ◽  
Premature Babies ◽  
Low Weight

Aim. To study the indicators of bone metabolism in premature babies born naturally and children born with IVF. Material and methods. The premature babies’ study was conducted, they were divided into 4 groups: depending on the method of birth and weight: 1st-children born with IVF, with very low weight; the second group – similar to the first, but children with extremely low weight; the third – children with very low weight, born naturally, with ; the fourth – similar to the 3rd, but with extremely low weight. The level of calcium, parathyroid hormone, calcitonin and C-terminal telopeptides of type I collagen was determined. Results and discussion. Diagnosis of vitamin D deficiency is possible only by measuring certain biochemical parameters, primarily the levels of its metabolites in the blood. Clinical symptoms of vitamin D deficiency in the form of rickets, osteomalacia, osteoporosis and extra-skeletal manifestations as a result of this vitamin deficiency occur over a long period of time. The most informative indicator of the body’s vitamin D supply is the content of calcidiol [25 (OH)D] in both serum and blood plasma. Vitamin D deficiency was detected in more than half (67.7±4.8%) of premature newborns in the first year of life. It seemed that in premature babies born in different ways, vitamin D deficiency was noted in 8 %, insufficiency – in 67.7 %, and the normal content in 27.5 %. In children at an early age, there is a violation of bone metabolism (an increase in the level of calcium, parathyroid hormone, calcitonin, on the one hand, and a decrease in the C-terminal telopeptides of type I collagen, on the other). These changes were associated with the weight of children, while aggressive disorders were noted in children with extremely low weight. In premature infants (with a body weight of less than 1500 g), monitoring of the level of vitamin D in the blood and C-terminal telopeptides of type 1 collagen should be recommended. Conclusion. Bone modeling has a great advantage due to the analysis of the blood serum biomarkers levels in premature infants, it enables to establish the features of osteogenesis.

scholarly journals Association between serum vitamin B6concentration and risk of osteoporosis in the middle-aged and older people in China: a cross-sectional study

BMJ Open ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. e028129 ◽  
Author(s):  
Jing Wang ◽  
Lin Chen ◽  
Yan Zhang ◽  
Chen-guang Li ◽  
Hao Zhang ◽  
...  
Keyword(s):  
Vitamin D ◽  
Parathyroid Hormone ◽  
Type I Collagen ◽  
Bone Turnover Marker ◽  
Serum Vitamin ◽  
Type I ◽  
Hormone Concentration ◽  
Mineral Density ◽  
Cross Sectional ◽  
25 Hydroxy Vitamin D

ObjectiveTo determine the relationship between serum vitamin B6(Vit B6) concentration and the status of bone mineral density and identify the relationship between serum Vit B6 and bone metabolism parameters in middle-aged and older people in China.DesignThe present study was a cross-sectional study within the framework of an ongoing prospective population-based cohort study.Setting and participantsA total of 1829 residents (men ≥50 years and women ≥45 years) from two subdistricts were recruited from July 2015 to February 2016 in Shanghai, China.MeasuresRecruited residents were grouped (control, osteopenia and osteoporosis) according to their lumbar spine bone mineral density, measured through dual-energy X-ray absorptiometry. Serum Vit B6concentrations, bone turnover marker concentrations and calcium and phosphorus metabolism parameters were assessed.ResultsNo significant linear trend between serum Vit B6concentrations and lumbar bone mass was observed in the men. In the women, the average osteoporosis risk was 61% higher at serum Vit B6concentrations of <19.2 μg/L than at those of >26.9 μg/L (OR 1.61, 95% CI 1.00 to 2.58). However, there was no significance after controlling of serum 25-hydroxy-vitamin D concentration and parathyroid hormone concentration, respectively. In the osteoporotic women, the serum Vit B6concentration was significantly negatively correlated to concentrations of bone turnover marker including N-terminal propeptide of type I collagen, β-C-terminal telopeptide of type I collagen and osteocalcin. It was also positively related to the serum 25-hydroxy-vitamin D concentration and inversely related to the serum parathyroid hormone concentration.ConclusionsA relatively low serum Vit B6concentration, even in the normal range, may be a risk factor for osteoporosis in postmenopausal women, which is dependent on serum 25-hydroxy-vitamin D concentration and parathyroid hormone concentration.Trial registration numberNCT02958020; Post-results.

Effects of seasonal vitamin D deficiency and respiratory acidosis on bone metabolism markers in submarine crewmembers during prolonged patrols

2012 ◽  
Vol 112 (4) ◽  
pp. 587-596 ◽  
Author(s):  
Xavier Holy ◽  
Jean-Marc Collombet ◽  
Frédéric Labarthe ◽  
Nicolas Granger-Veyron ◽  
Laurent Bégot
Keyword(s):  
Vitamin D ◽  
Alkaline Phosphatase ◽  
Bone Metabolism ◽  
Bone Remodeling ◽  
Type I Collagen ◽  
Respiratory Acidosis ◽  
Bone Alkaline Phosphatase ◽  
Type I ◽  
Vitamin D Status ◽  
Seasonal Influence

The aim of the study was to determine the seasonal influence of vitamin D status on bone metabolism in French submariners over a 2-mo patrol. Blood samples were collected as follows: prepatrol and patrol days 20, 41, and 58 on crewmembers from both a winter (WP; n = 20) and a summer patrol (SP; n = 20), respectively. Vitamin D status was evaluated for WP and SP. Moreover, extended parameters for acid-base balance (Pco2, pH, and bicarbonate), bone metabolism (bone alkaline phosphatase and COOH-terminal telopeptide of type I collagen), and mineral homeostasis (parathyroid hormone, ionized calcium and phosphorus) were scrutinized. As expected, SP vitamin D status was higher than WP vitamin D status, regardless of the considered experimental time. A mild chronic respiratory acidosis (CRA) was identified in both SP and WP submariners, up to patrol day 41. Such an occurrence paired up with an altered bone remodeling coupling (decreased bone alkaline phosphatase-to-COOH-terminal telopeptide of type I collagen ratio). At the end of the patrol ( day 58), a partial compensation of CRA episode, combined with a recovered normal bone remodeling coupling, was observed in SP, not, however, in WP submariners. The mild CRA episode displayed over the initial 41-day submersion period was mainly induced by a hypercapnia resulting from the submarine-enriched CO2 level. The correlated impaired bone remodeling may imply a physiological attempt to compensate this acidosis via bone buffering. On patrol day 58, the discrepancy observed in terms of CRA compensation between SP and WP may result from the seasonal influence on vitamin D status.

scholarly journals Association of Higher Plasma Vitamin D Binding Protein and Lower Free Calcitriol Levels with Tenofovir Disoproxil Fumarate Use and Plasma and Intracellular Tenofovir Pharmacokinetics: Cause of a Functional Vitamin D Deficiency?

2013 ◽  
Vol 57 (11) ◽  
pp. 5619-5628 ◽  
Author(s):  
Peter L. Havens ◽  
Jennifer J. Kiser ◽  
Charles B. Stephensen ◽  
Rohan Hazra ◽  
Patricia M. Flynn ◽  
...  
Keyword(s):  
Vitamin D ◽  
Parathyroid Hormone ◽  
Vitamin D Deficiency ◽  
Tenofovir Disoproxil Fumarate ◽  
Binding Protein ◽  
Tubular Reabsorption ◽  
Plasma Vitamin ◽  
Calcium Balance ◽  
Vitamin D Binding Protein ◽  
Tenofovir Diphosphate

ABSTRACTTenofovir disoproxil fumarate (TDF) causes bone, endocrine, and renal changes by an unknown mechanism(s). Data are limited on tenofovir pharmacokinetics and these effects. Using baseline data from a multicenter study of HIV-infected youth on stable treatment with regimens containing TDF (n= 118) or lacking TDF (n= 85), we measured cross-sectional associations of TDF use with markers of renal function, vitamin D-calcium-parathyroid hormone balance, phosphate metabolism (tubular reabsorption of phosphate and fibroblast growth factor 23 [FGF23]), and bone turnover. Pharmacokinetic-pharmacodynamic associations with plasma tenofovir and intracellular tenofovir diphosphate concentrations were explored among those receiving TDF. The mean age was 20.9 (standard deviation [SD], 2.0) years; 63% were male; and 52% were African American. Compared to the no-TDF group, the TDF group showed lower mean estimated glomerular filtration rates and tubular reabsorption of phosphate, as well as higher parathyroid hormone and 1,25-dihydroxy vitamin D [1,25-OH(2)D] levels. The highest quintile of plasma tenofovir concentrations was associated with higher vitamin D binding protein, lower free 1,25-OH(2)D, higher 25-OH vitamin D, and higher serum calcium. The highest quintile of intracellular tenofovir diphosphate concentration was associated with lower FGF23. Higher plasma tenofovir concentrations were associated with higher vitamin D binding protein and lower free 1,25-OH(2)D, suggesting a functional vitamin D deficiency explaining TDF-associated increased parathyroid hormone. The finding of lower FGF23 accompanying higher intracellular tenofovir diphosphate suggests that different mechanisms mediate TDF-associated changes in phosphate handling. Separate pharmacokinetic properties may be associated with distinct TDF toxicities: tenofovir with parathyroid hormone and altered calcium balance and tenofovir diphosphate with hypophosphatemia and FGF23 regulation.IMPORTANCE(The clinical trial registration number for this study is NCT00490412 and is available online athttp://clinicaltrials.gov/ct2/show/NCT00490412.)

scholarly journals The effect of a high-protein, high-sodium diet on calcium and bone metabolism in postmenopausal women and its interaction with vitamin D receptor genotype

2004 ◽  
Vol 91 (1) ◽  
pp. 41-51 ◽  
Author(s):  
Mary Harrington ◽  
Teresa Bennett ◽  
Jette Jakobsen ◽  
Lars Ovesen ◽  
Christine Brot ◽  
...  
Keyword(s):  
Vitamin D ◽  
Bone Resorption ◽  
Bone Metabolism ◽  
Postmenopausal Women ◽  
Vitamin D Receptor ◽  
Type I Collagen ◽  
High Protein ◽  
Type I ◽  
Dietary Regimen ◽  
High Sodium

The influence of a high-Na, high-protein (calciuric) diet on Ca and bone metabolism was investigated in postmenopausal women (aged 50–67 years) who were stratified by vitamin D receptor (VDR) genotype. In a crossover trial, twenty-four women were randomly assigned to a diet high in protein (90 g/d) and Na (180 mmol/d) or a diet adequate in protein (70 g/d) and low in Na (65 mmol/d) for 4 weeks, followed by crossover to the alternative dietary regimen for a further 4 weeks. Dietary Ca intake was maintained at usual intakes (about 20 mmol (800 mg)/d). Urinary Na, K, Ca, N and type I collagen cross-linked N-telopeptide (NTx; a marker of bone resorption), plasma parathyroid hormone (PTH), serum 25-hydroxycholecalciferol (25(OH)D3), 1,25-dihydroxycholecalciferol (1,25(OH)2D3), osteocalcin and bone-specific alkaline phosphatase (B-Alkphase) were measured in 24 h urine samples and fasting blood samples collected at the end of each dietary period. The calciuric diet significantly (P<0·05) increased mean urinary Na, N, K, Ca and NTx (by 19 %) compared with the basal diet, but had no effect on circulating 25(OH)D3, 1,25(OH)2D3, PTH, osteocalcin or B-Alkphase in the total group (n 24). There were no differences in serum markers or urinary minerals between the basal and calciuric diet in either VDR genotype groups. While the calciuric diet significantly increased urinary NTx (by 25·6 %, P<0·01) in the f+ VDR group (n 10; carrying one or more (f) Fok I alleles), it had no effect in the f− VDR group (n 14; not carrying any Fok I alleles). It is concluded that the Na- and protein-induced urinary Ca loss is compensated for by increased bone resorption and that this response may be influenced by VDR genotype.

Plasma parathyroid hormone-related peptide and bone metabolism in periparturient dairy cows

2008 ◽  
Vol 56 (2) ◽  
pp. 235-244 ◽  
Author(s):  
Natalija Filipović ◽  
Zvonko Stojević ◽  
Maja Zdelar-Tuk ◽  
Vesna Kušec
Keyword(s):  
Parathyroid Hormone ◽  
Bone Resorption ◽  
Dairy Cows ◽  
Bone Metabolism ◽  
Type I Collagen ◽  
Type I ◽  
Bone Specific Alkaline Phosphatase ◽  
Related Peptide ◽  
Parathyroid Hormone Related Peptide

The first weeks of lactation in dairy cows are characterised by elevated bone resorption. The connection between lactation and bone metabolism is still much discussed. In this work, changes in the concentration of plasma parathyroid hormone-related peptide (PTHrP) and markers of bone metabolism were studied in Holstein cows and heifers in the dry period and early lactation to determine the role of PTHrP in the relationship between the rate of bone remodelling and the onset of lactation in dairy cows. Blood samples were taken 14 days before calving (‘D-14’, n = 23) and then on day 10 (‘D+10’, n = 21) and day 30 after calving (‘D+30’, n = 23). Using enzyme immunoassay (EIA), the concentrations of PTHrP, parathyroid hormone (PTH), carboxyterminal cross-linked telopeptide of type I collagen (CTX) and oestradiol and the activity of bone specific alkaline phosphatase (BSALP) were determined. The results showed a statistically significant increase in plasma PTHrP (p < 0.005) and CTX (p < 0.0001) in cows on ‘D+10’ as compared to ‘D-14’ and CTX on ‘D+30’ as compared to ‘D-14’ (p < 0.0001). Significant negative correlations were found between the concentrations of PTHrP and oestradiol (r = −0.29, p < 0.05) and those of CTX and oestradiol (r = −0.54, p < 0.0001). In nonpregnant heifers (n = 6), the concentration of CTX and the activity of BSALP were significantly higher (p < 0.0001) than in dry cows. The observed increments of PTHrP and bone resorption after parturition reveal adaptations of bone metabolism to lactation in dairy cows.

Insights into the Association of Vitamin D Deficiency with Parathyroid Hormone Levels with Relevance to Renal Function and Insulin Resistance

2019 ◽  
Vol 15 (2) ◽  
pp. 196-200 ◽  
Author(s):  
Iyyapu K. Mohan ◽  
Siraj A. Khan ◽  
Rachel Jacob ◽  
Kompella S.S.S. Baba ◽  
Tajamul Hussain ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Vitamin D ◽  
Renal Function ◽  
Parathyroid Hormone ◽  
Serum Creatinine ◽  
Vitamin D Deficiency ◽  
Plasma Vitamin ◽  
Inverse Association ◽  
Hormone Levels ◽  
Increased Risk

Background: In majority of the studies inverse association between vitamin D and parathyroid hormone levels is documented. Objective: The rationale of the current study was to investigate whether this inverse association is agedependent and whether it has any role in modulating renal function and insulin resistance. Methods: To test this hypothesis, we have carried out a hospital based study enrolling 848 subjects (558 men and 290 women) with the mean age of 50.9 ± 15.9 y. Chemiluminometric competitive immune assays were performed using commercial kits to determine 25-OH vitamin D and Parathyroid Hormone (PTH) levels. Fasting glucose levels and serum creatinine were used to evaluate diabetes and renal function. Results: Vitamin D deficiency was predominant irrespective of age group (p = 0.21) and gender (p = 0.12). An inverse association between vitamin D and PTH was observed (r = -0.24) in middle age subjects (p = 0.02). The data segregation based on plasma vitamin D levels which were <20 ng/ml, 20.1- 30 ng/ml and >30 ng/ml confirmed the inverse association between vitamin D and PTH levels (ptrend: 0.007). Subjects with low plasma vitamin D and increased PTH exhibited elevated blood urea, serum creatinine and blood glucose. Subjects with 25-OHD deficiency showed a 3.03-folds (95% CI: 2.26- 4.07) and 2.09-fold (1.41-3.10) increased risk for diabetes and renal disease, respectively. Conclusion: Based on the results of the present study, it is suggested that those with vitamin D deficiency need to be evaluated for possible presence of renal dysfunction, diabetes/insulin resistance in addition to assessing their PTH status.

scholarly journals The Effect of the Vitamin D Receptor on Bone Metabolism Disorders in Premature Infants Born Using In Vitro Fertilization

2021 ◽  
Vol 20 (5) ◽  
pp. 92-98
Author(s):  
Natalia A. Druzhinina ◽  
Dinara R. Merzlyakova ◽  
Naila R. Hafizova ◽  
Valentina Yu. Gorbunova ◽  
Lilia R. Imaeva ◽  
...  
Keyword(s):  
Vitamin D ◽  
In Vitro Fertilization ◽  
Bone Metabolism ◽  
Premature Infants ◽  
Vitamin D Receptor ◽  
Mutant Allele ◽  
Vdr Gene ◽  
Vitro Fertilization ◽  
Premature Babies

Aim. To study the effect of the vitamin D receptor on bone metabolism disorders in premature infants born using in vitro fertilization (IVF). Material and methods. A study was conducted on 189 premature infants, divided into 2 groups. The first group is premature babies born using the IVF method. The second group – children were born naturally. The VDR receptor gene was analyzed depending on the observation groups. Results. It was found that in children born with IVF, the signs of osteopenia were more pronounced. Genetic studies have shown that the frequency of mutant allele *B and homozygous mutant genotype B/B of the VDR gene is more common in premature babies born with IVF. Mutant homozygous genotype B/B occurs in the main group of children with a frequency of 35%, which is significantly higher than in the control group of children (17%). Changes in bone metabolism are one of the important causes of musculoskeletal system disorders, which is closely associated with the molecular genetic polymorphism of the VDR gene. Conclusion. The studies conducted led to the following conclusion: the frequency of the mutant allele *B and homozygous for the mutant allele genotype B/B, occurs more often in premature babies born using IVF. The frequency of the *B allele in the group of premature babies born using IVF is 50%, which is higher than in the group of premature babies born naturally (40%). However, the identified genetic differences are not associated with the IVF procedure. These are combinations of gene alleles inherited from the parents. Knowledge of hereditary risk factors for low vitamin D3 levels can be of great practical importance for predicting bone metabolism disorders in premature infants.

scholarly journals Serum levels of bone formation and resorption markers in relation to vitamin D status in professional gymnastics and physically active men during upper and lower body high-intensity exercise

2021 ◽  
Vol 18 (1) ◽  
Author(s):  
Jan Mieszkowski ◽  
Andrzej Kochanowicz ◽  
Elżbieta Piskorska ◽  
Bartłomiej Niespodziński ◽  
Joanna Siódmiak ◽  
...  
Keyword(s):  
Vitamin D ◽  
Bone Formation ◽  
Bone Turnover ◽  
Bone Turnover Markers ◽  
Type I Collagen ◽  
Serum Levels ◽  
Type I ◽  
Vitamin D Metabolites ◽  
Physically Active ◽  
Turnover Markers

Abstract Purpose/introduction To compare serum levels of bone turnover markers in athletes and non-athletes, and to evaluate the relationship between serum levels of vitamin D metabolites and exercise-induced changes in biomarker levels. Methods Sixteen elite male artistic gymnasts (EG; 21.4 ± 0.8 years-old) and 16 physically active men (the control group, PAM; 20.9 ± 1.2 years-old) performed lower and upper body 30-s Wingate anaerobic tests (LBWT and UBWT, respectively). For biomarker analysis, blood samples were collected before, and 5 and 30 min after exercise. Samples for vitamin D levels were collected before exercise. N-terminal propeptide of type I collagen (PINP) was analysed as a marker of bone formation. C-terminal telopeptide of type I collagen (CTX) was analysed as a marker of bone resorption. Results UBWT fitness readings were better in the EG group than in the PAM group, with no difference in LBWT readings between the groups. UBWT mean power was 8.8% higher in subjects with 25(OH)D3 levels over 22.50 ng/ml and in those with 24,25(OH)2D3 levels over 1.27 ng/ml. Serum CTX levels increased after both tests in the PAM group, with no change in the EG group. PINP levels did not change in either group; however, in PAM subjects with 25(OH)D3 levels above the median, they were higher than those in EG subjects. Conclusion Vitamin D metabolites affect the anaerobic performance and bone turnover markers at rest and after exercise. Further, adaptation to physical activity modulates the effect of anaerobic exercise on bone metabolism markers.

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