25-hydroxyvitamin D3 Concentration Research Articles

A study on the effects of vitamin D supplementation on hematological parameters and serum 25-hydroxy vitamin D in healthy dogs

BackgroundLimited studies are available on vitamin D supplementation in dogs. This study evaluates the effect of a commercial vitamin D3 supplement on serum 25-hydroxy vitamin D as well as selected biochemical and hematological parameters in healthy dogs. Eight intact male adult dogs with a mean body weight of 20 kg from mixed breeds were included in the study. After adaptation period, dogs received vitamin D3 supplement at the dose of 50 IU/kg body weight per day. Blood samples were collected on days 0, 14, 28 and 42 of supplementation. Food was used for analysis of vitamin D3 content.ResultsSignificant increase in serum level of 25-hydroxy vitamin D3 was detected since day 14 of supplementation. Changes in serum 25-hydroxy vitamin D3 concentration during time showed an upward significance (p < 0.05). Vitamin D3 content of the food was 2900 IU/kg dry matter. Changes in serum phosphorus levels were upward significant. No dog showed calcium or phosphorus levels above the highest reference level. Liver and kidney parameters remained in the reference range during the experiment. A gradual significant increase was observed in hemoglobin and hematocrit which was started from day 14. Vitamin D3 supplementation had no significant effect on neutrophils, monocytes and lymphocytes percent during the study.ConclusionsVitamin D3 supplementation at 50 IU/kg BW daily, increases serum levels of 25-hydroxy vitamin D in healthy dogs fed with a diet containing proper amount of this vitamin. It also increases hemoglobin and hematocrit levels in a time dependent manner without inducing adverse effects.

Association between vitamin D and endometriosis among American women: National Health and Nutrition Examination Survey.

Endometriosis is a multifactorial disease associated with inflammation. Vitamin D has anti-inflammatory, antiproliferative, anti-oxidative, and immunomodulatory effects. Whether vitamin D levels are correlated with endometriosis is a subject of ongoing debate. This study aimed to examine the association between endometriosis and serum vitamin D levels. From the National Health and Nutrition Examination Survey, this study examined the cross-sectional data of American women aged 20-54 years from 2001 to 2006. After adjusting for covariates, multivariable logistic regression analysis was used to assess correlations. A total of 3,232 women were included in this study. The multiple linear regression model demonstrated a negative correlation between the serum 25-hydroxyvitamin D3 (cholecalciferol) concentration and the risk of endometriosis after controlling for all confounding variables. The odds ratio was 0.73 with a 95% confidence interval of 0.54-0.97 in the adequate vitamin D level group compared with the insufficient vitamin D level group. Our results showed that endometriosis was inversely correlated with serum 25-hydroxyvitamin D3 levels. Further research is needed to establish a causal relationship and determine the potential benefits of maintaining sufficient vitamin D levels for endometriosis prevention.

Supplementation with Vitamin D3 Protects against Mitochondrial Dysfunction and Loss of BDNF-Mediated Akt Activity in the Hippocampus during Long-Term Dexamethasone Treatment in Rats.

Dexamethasone (DEXA) is a commonly used steroid drug with immunosuppressive and analgesic properties. Unfortunately, long-term exposure to DEXA severely impairs brain function. This study aimed to investigate the effects of vitamin D3 supplementation during chronic DEXA treatment on neurogenesis, mitochondrial energy metabolism, protein levels involved in the BDNF-mediated Akt activity, and specific receptors in the hippocampus. We found reduced serum concentrations of 25-hydroxyvitamin D3 (25(OH)D3), downregulated proBDNF and pAkt, dysregulated glucocorticosteroid and mineralocorticoid receptors, impaired mitochondrial biogenesis, and dysfunctional mitochondria energy metabolism in the DEXA-treated group. In contrast, supplementation with vitamin D3 restored the 25(OH)D3 concentration to a value close to that of the control group. There was an elevation in neurotrophic factor protein level, along with augmented activity of pAkt and increased citrate synthase activity in the hippocampus after vitamin D3 administration in long-term DEXA-treated rats. Our findings demonstrate that vitamin D3 supplementation plays a protective role in the hippocampus and partially mitigates the deleterious effects of long-term DEXA administration. The association between serum 25(OH)D3 concentration and BDNF level in the hippocampus indicates the importance of applying vitamin D3 supplementation to prevent and treat pathological conditions.

Thoroughbred Racehorses in Hong Kong Require Vitamin D Supplementation to Mitigate the Risk of Low Vitamin D Status.

There is a paucity of data relating to the vitamin D status of racehorses. We hypothesised that the management of racehorses in Hong Kong (HK) predisposes to low vitamin D status unless they receive dietary supplementation. Serum concentrations of 25-hydroxyvitamin D2 (25OHD2), 25-hydroxyvitamin D3 (25OHD3) and total 25-hydroxyvitamin D (total 25OHD) for 79 non-grazing HK racehorses were compared with those for 22 racehorses training in the United Kingdom (UK) that grazed for ≥1 h/d, and for which published data exists. A nested group of 41 HK horses was sampled twice to determine the effect of the duration in HK on vitamin D status. The HK horses had significantly lower serum concentrations of total 25OHD and 25OHD2 than the UK horses; 25OHD2 was undetectable in 15/79 HK sera and serum concentrations of 25OHD2 declined with the duration in HK. The main determinants of vitamin D status were assessed using linear regression; the retained variables were the 25OHD3 concentration and the duration in HK. The inverse relationship between the serum concentrations of 25OHD2 and 25OHD3, previously identified in humans, was observed for the first time in horses. In conclusion, HK racehorses have low serum 25OHD2 and total 25OHD concentrations and rely on D3 supplementation to maintain adequate vitamin D status. Further study is required to determine the optimal form of dietary vitamin D supplementation for Thoroughbred racehorses.

SERUM VITAMIN D IN PATIENTS WITH BENIGN, PRIMARY MALIGNANT AND METASTATIC BONE TUMORS

Participant in the process of normal bone remodeling is vitamin D, which, in addition, has antiinflammatory (anti-cytokine), anti-proliferative and anti-tumor effects. Objective of the study is to assess the level of 25-hydroxyvitamin D3 concentration in blood serum before the start of treatment in patients with benign, primary malignant and metastatic bone tumors, taking into account polymorbidity. Materials and methods. The following patients were included in the study: 21 patients with benign pelvic bone tumors; 52 patients with malignant tumors of the bones of the pelvis and lower limbs; 52 patients with metastatic tumors of the bones of the pelvis and lower limbs. The control group consisted of 22 practically healthy volunteers without chronic diseases. The content of vitamin D was determined by the immunochemiluminescence method. The results. The content of vitamin D in blood serum in patients with benign bone tumors is in the range from 22.4 to 29.6 ng/ml, with primary malignant tumors — from 7.8 to 15.9 ng/ml, with metastatic ones — from 13.8 to 15.5 ng/ml. There are no statistically significant differences between the histotypes of primary malignant bone tumors (p &gt; 0.05). Conclusions. Polymorbidity statistically significantly increases vitamin D deficiency in patients with osteogenic sarcoma and patients with metastatic bone tumors (p &lt; 0.05). According to the national classification of vitamin D content, patients with benign bone tumors have a suboptimal level of vitamin D, while patients with primary malignant and metastatic bone tumors have vitamin D deficiency.

Mechanistic approaching study in COVID-19 patients treated with high doses of vitamin D

Aim: To evaluate angiotensin II (Ang II) and Ang-(1-7) levels and the cytokine profile in patients hospitalized with mild coronavirus disease 2019 (COVID-19) and contrast them with patients with identical clinical conditions but treated with high doses of vitamin D (vitD). Methods: From the 218 patients recruited (ClinicalTrials.gov NCT04411446), 16 participated in this sub-study and were randomized to a single oral dose of 500,000 IU vitD (n = 10) or placebo (n = 6). Plasmatic Ang II and Ang-(1-7) levels were determined by radioimmunoassay and interleukins (ILs) 1, 6, 8, and 10 and tumor necrosis factor alpha (TNF-α) by enzyme-linked immunosorbent assay before and after treatment. Parallel, serum 25-hydroxyvitamin D3 (25-OH vitD) concentrations as vitD status was measured by a chemiluminescence immunoassay. Results: A trend towards an increase in Ang-(1-7) and a decrease in Ang II levels were observed in placebo- and vitD-treated COVID-19 patients compared to baseline values. There was no difference in Ang II and Ang-(1-7) levels between placebo- and vitD-treated COVID-19 patients. Similar results were obtained with ILs profile. COVID-19 patients showed an increase in the protective component of the RAS which was not improved by vitD treatment. Conclusions: VitD did not improve RAS disbalance in COVID-19. Notwithstanding, the authors visualize that acute treatment with high doses of vitD may show a trend to a decline in inflammatory ILs and an increase in protective markers. Finally, the authors would like to highlight the limitations of this preliminary study, namely the small number of patients and the use of a large single bolus dose of vitD rather than lower daily doses for extended periods with prolonged follow-up times. All these factors need special consideration in the designs of new vitD supplementation trials. All these factors need special consideration in the designs of new vitD supplementation trials (ClinicalTrials.gov identifier: NCT04411446).

Effects of Short-Duration Artificial Ultraviolet B Exposure on 25-Hydroxyvitamin D3 Concentrations in Domestic Rabbits (Oryctolagus cuniculus).

Vitamin D is an important hormone that can be acquired through diet, exposure to ultraviolet B (UVB) radiation, or a combination of these methods. In domestic rabbits (Oryctolagus cuniculus), both methods appear viable, but there is limited research evaluating the effects of UVB on this species. Previous studies found that 12 h of artificial UVB radiation significantly increased 25-hydroxyvitamin D3 (25-OHD3) concentrations over time. While these findings suggest UVB can be beneficial in rabbits, this form of radiation can also be detrimental to vertebrates. The purpose of this study was to determine if shorter-duration UVB could elicit a similar physiological response in rabbits while minimizing potential negative effects. Six rabbits were used for this pilot study. The baseline serum 25-OHD3 was measured for each rabbit and following 14 days of 6 h/day exposure to artificial UVB, a second 25-OHD3 sample was collected. There was a significant increase (p = 0.001) in serum 25-OHD3 over time (Baseline: 27.7 ± 8.1 nmol/L; Day 14: 79.8 ± 9 nmol/L). This study affirmed that 6 h of UVB produced 25-OHD3 concentrations similar to those found in rabbits exposed to 12 h of UVB. Future studies should continue to determine how the duration of UVB exposure affects 25-OHD3 concentrations.

Association between serum concentrations of 25-hydroxyvitamin D3 and periodontal disease in the US population

Periodontal disease (PD) is a common chronic inflammatory disease and an important risk factor for tooth loss. Vitamin D might affect periodontal disease risk via an effect on bone mineral density (BMD) or via immunomodulatory effects. The objective was to evaluate whether serum 25-hydroxyvitamin D(3) [25(OH)D(3)] concentrations are associated with PD in the third National Health and Nutrition Examination Survey. We analyzed data on periodontal attachment loss (AL) and serum 25(OH)D(3) concentrations from 11 202 subjects aged > or =20 y. Mean AL was modeled in a multiple linear regression with quintile of serum 25(OH)D(3) concentration as an independent variable. The model was stratified by age and sex and was adjusted for age within age groups, race or ethnicity, smoking, diabetes, poverty income ratio, body mass index, estrogen use, and gingival bleeding. 25(OH)D(3) concentrations were significantly and inversely associated with AL in men and women aged > or =50 y. Compared with men in the highest 25(OH)D(3) quintile, those in the lowest quintile had a mean AL that was 0.39 mm (95% CI: 0.17, 0.60 mm) higher; in women, the difference in AL between the lowest and highest quintiles was 0.26 mm (0.09, 0.43 mm). In men and women younger than 50 y, there was no significant association between 25(OH)D(3) and AL. The BMD of the total femoral region was not associated with AL and did not mediate the association between 25(OH)D(3) and AL. Low serum 25(OH)D(3) concentrations may be associated with PD independently of BMD. Given the high prevalence of PD and vitamin D deficiency, these findings may have important public health implications.

Altered Expression of Antimicrobial Peptides in the Upper Gastrointestinal Tract of Patients with Diabetes Mellitus.

Antimicrobial peptides (AMP) are essential components of innate immunity with a broad range of antimicrobial activities against bacteria, viruses, and fungi. The aim of this study was to investigate AMP expression in the upper gastrointestinal tract in normal and pathological metabolic states in humans. Furthermore, we examined the correlation between vitamin D levels and AMP expression in the same cohort. Serum concentrations of 25-hydroxyvitamin D3 were measured, and mRNA expression of β-defensins HBD-1, -2, -3, -4, α-defensins HD-5 and -6 and cathelicidin in the upper gastrointestinal tract epithelia were determined by quantitative RT-PCR in 31 individuals (10 with type 2 diabetes, 10 with insulin resistance, and 11 healthy controls). The majority of the cohort showed low vitamin D concentrations, which were negatively correlated with mRNA expression levels of HBD-3 in corpus mucosa. HBD-1 and HBD-3 mRNA were expressed in corpus mucosa, with the former significantly decreased in patients with diabetes. Hence, we conclude that type 2 diabetes is associated with reduced AMP expression in the upper gastrointestinal tract, which might contribute towards epithelial barrier dysfunction and increased bacterial translocation in these patients.

Serum bone remodeling parameters and transcriptome profiling reveal abnormal bone metabolism associated with keel bone fractures in laying hens

Keel bone fractures affect welfare, health, and production performance in laying hens. A total of one hundred and twenty 35-wk-old Hy-line Brown laying hens with normal keel (NK) bone were housed in furnished cages and studied for ten weeks to investigate the underlying mechanism of keel bone fractures. At 45 wk of age, the keel bone state of birds was assessed by palpation and X-ray, and laying hens were recognized as NK and fractured keel (FK) birds according to the presence or absence of fractures in keel bone. The serum samples of 10 NK and 10 FK birds were collected to determine bone metabolism-related indexes and slaughtered to collect keel bones for RNA-sequencing (RNA-seq), Micro-CT, and histopathological staining analyses. The results showed that the concentrations of Ca, phosphorus, calcitonin, 25-hydroxyvitamin D3, and osteocalcin and activities of alkaline phosphatase and tartrate-resistant acid phosphatase (TRAP) in serum samples of FK birds were lower than those of NK birds (P < 0.05), but the concentrations of parathyroid hormone, osteoprotegerin, and corticosterone in serum samples of FK birds were higher than those of NK birds (P < 0.05). TRAP staining displayed that FK bone increased the number of osteoclasts (P < 0.05). Micro-CT analysis indicated that FK bone decreased bone mineral density (P < 0.05). Transcriptome sequencing analysis of NK and FK bones identified 214 differentially expressed genes (DEGs) (|log2FoldChange| > 1, P < 0.05), among which 88 were upregulated and 126 downregulated. Kyoto Encyclopedia of Genes and Genomes pathway (KEGG) analysis indicated that 14 DEGs related to skeletal muscle movement and bone Ca transport (COL6A1, COL6A2, COL6A3, PDGFA, MYLK2, EGF, CAV3, ADRA1D, BDKRB1, CACNA1S, TNN, TNNC1, TNNC2, and RYR3) were enriched in focal adhesion and Ca signaling pathway, regulating bone quality. This study suggests that abnormal bone metabolism related to keel bone fractures is possibly responded to fracture healing in laying hens.

Biomarkers of Vitamin D Metabolism and Hip and Vertebral Fracture Risk: The Multi-Ethnic Study of Atherosclerosis.

Studies on associations between biomarkers of vitamin D metabolism and fracture risk have focused predominantly on White or elderly populations and may not be generalizable to relatively healthy multiethnic populations. We tested associations of total 25-hydroxyvitamin D (25[OH]D), the ratio of 24,25-dihydroxyvitamin D3 to 25-hydroxyvitamin D3 (vitamin D metabolite ratio, VDMR), parathyroid hormone (PTH), and fibroblast growth factor-23 (FGF-23) concentrations measured in serum with risk of hip and vertebral fractures in the Multi-Ethnic Study of Atherosclerosis (MESA). Serum 25-hydroxyvitamin D2 and D3 and 24,25-dihydroxyvitamin D3 were measured by liquid chromatography-tandem mass spectrometry (LC-MS/MS). The study cohort of 6466 participants was without clinically apparent cardiovascular disease and was 39% White, 27% Black, 22% Hispanic, and 12% Chinese. The mean age was 62 years, and 53% were female. There were 128 hip and vertebral fractures over a mean follow-up of 14.2 years. 25(OH)D, the VDMR, PTH, and FGF-23 were not significantly associated with fracture risk after adjustment for demographics, diabetes, smoking, systolic blood pressure, body mass index, medication use, albuminuria, and estimated glomerular filtration rate. Principal component analysis did not suggest differences in linear combinations of 25(OH)D, the VDMR, PTH, and FGF-23 between participants who experienced fractures and those who did not. We did not observe significant interaction between race and ethnicity and any biomarker of vitamin D metabolism on fracture risk. In conclusion, none of the four serum biomarkers of vitamin D metabolism investigated showed a significant association with fracture risk in relatively healthy multiethnic populations. © 2022 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.

Effects of Artificial Ultraviolet B Radiation on Plasma 25-Hydroxyvitamin D3 Concentrations in Juvenile Blanding's Turtles (Emydoidea blandingii)

Abstract Vitamin D is an essential hormone that can be acquired via the diet, exposure to ultraviolet B (UVB) radiation, or a combination of both. Studies in reptiles suggest that the acquisition of vitamin D can vary between species; thus, species-specific evidence-based research should be pursued to develop appropriate husbandry recommendations. The objective of this study was to determine whether artificial UVB could be used to increase circulating 25-hydroxyvitamin D3 (25-OHD3) concentrations in juvenile Blanding's turtles (Emydoidea blandingii). Sixteen juvenile Blanding's turtles from an ongoing headstart program at the DuPage County Forest Preservation District (Wheaton, IL, USA) were used for this study. The Blanding's turtles were randomly divided into two groups of eight by using a random number generator. The treatment group was exposed to light from three compact UVB 23-W fluorescent bulbs 12 h/day for 6 months, whereas the control group was not provided supplemental UVB lighting. Bulbs were placed 15.2 cm (6 in) from the water surface. A radiometer was used to measure UVB radiation 15.2 cm from the bulb surface on days 0 and 180. Blood samples were collected at a single time point (day 180) to measure 25-OHD3 concentrations. There was a significant difference (P &amp;lt; 0.001) in plasma 25-OHD3 concentrations between groups, with 25-OHD3 concentrations being 5.5 times higher in the UVB group than in the controls. Based on the results of this study, we recommend exposing juvenile Blanding's turtles to artificial UVB as part of their standard care.

Effects of feeding 25-hydroxyvitamin D3 with an acidogenic diet during the prepartum period in dairy cows: Mineral metabolism, energy balance, and lactation performance of Holstein dairy cows

Our objective was to determine the effects of feeding 25-hydroxyvitamin D3 [25(OH)D3], or vitamin D3 (cholecalciferol) on plasma, mineral, and metabolite concentrations, mineral balance, mineral excretion, rumination, energy balance, and milk production of dairy cows. We hypothesized that supplementing 3 mg/d of 25(OH)D3 during the prepartum period would be more effective than supplementing vitamin D3 at the National Research Council (2001) levels to minimize calcium imbalance during the transition period and improve milk production of dairy cows. Forty multiparous, pregnant nonlactating-Holstein cows were enrolled in this study. Body weight, body condition score, parity, and milk yield in the previous lactation (mean ± standard deviation) were 661 ± 59.2, 3.46 ± 0.35, 1.79 ± 0.87, and 33.2 ± 6.43 kg/d, respectively. Cows were enrolled into the blocks (n = 20 for each treatment) at 30 d of the expected day of calving to receive an acidogenic diet (373 g/kg of neutral detergent fiber and 136 g/kg of crude protein, dry matter basis; -110 mEq/kg) associated with the treatments: (1) control (CTRL), vitamin D3 at 0.625 mg/d (equivalent to 25,000 IU of vitamin D3/d) or (2) 25(OH)D3 at 3 mg/d (equivalent to 120,000 IU of vitamin D3/d). All cows were fed with the base ration for 49 d after calving. Blood samples were taken on d 7, 0, 1, 2, 21, and 42, relative to calving. No effect of treatment was observed for prepartum dry matter intake or body condition score. A trend for increase of ionized Ca was observed for the cows fed 25(OH)D3, compared with the CTRL, but no effect of treatment was detected for total Ca or total P. Feeding 25(OH)D3 increased colostrum yield. The plasmatic concentration of 25-hydroxyvitamin D3 was increased with 25(OH)D3 supplementation. 25-Hydroxyvitamin D3 supplementation increased plasma glucose concentration at parturition. The postpartum dry matter intake was not influenced by treatments. Feeding 25(OH)D3 increases milk yield, 3.5% fat-corrected milk, and energy-corrected milk and improves milk yield components in early lactation. Overall, these findings suggest that 25(OH)D3 at 3 mg/d can improve the energy metabolism and lactation performance, compared with the current-feeding practice of supplementing vitamin D3 at 0.625 mg/d.

Analysis of the effects of UVB radiation on bone density and behavior of hatchling false water cobras, Hydrodynastes gigas.

In herpetoculture, there is debate as to whether ultraviolet-B, UVB, lighting is required for providing adequate welfare for snakes in human care. Many believe this supplemental lighting is unnecessary and is not utilized by the snakes, stating that snakes survive and breed in its absence. Previous studies using pythons and corn snakes have demonstrated that offering UVB lighting appears to have a significant effect on their physiology. These studies focused on the increase of 25-hydroxyvitamin D3 concentrations in the blood after UVB exposure. In the present study, false water cobras, Hydrodynastes gigas, were chosen because they are active, diurnal snakes and are therefore more likely to seek out UVB in the wild in comparison with other fossorial snakes. The level of UVB that will be provided is based on the tropical climate of the range for H. gigas. Twelve hatchling H. gigas will be divided into two groups with Arcadia T5 14% UVB lights provided for one group and LED lights provided for the other. The behavior of the snakes will be monitored through video recording to determine the effects of UVB lighting on basking behavior and total time exposed to the UVB lighting. To identify physiological effects, radiographs will be taken to determine any change in bone density. This study aims to find if offering UVB lighting promotes basking behavior and affects bone density in H. gigas. The results of this study can be used to further increase welfare standards for snakes in captivity.

Plasma 25-hydroxyvitamin D3 concentrations and incident risk of ischemic stroke in rural Chinese adults: New insight on ceiling effect

ObjectiveThe aim of this study was to investigate the relationship between 25-hydroxyvitamin D3 (25[OH]D3) and ischemic stroke and its potential modifying factors in rural Chinese adults. MethodsThis nested case-control study was drawn from the H-type Hypertension and Stroke Prevention and Control Project, a community-based, prospective, observational study. Plasma 25(OH)D3 was measured by liquid chromatography with tandem quadrupole mass spectrometry. All stroke records came from the Chinese Center for Disease Control and Prevention. Multiple logistic regression models were used to evaluate the association between 25(OH)D3 and risk of ischemic stroke. ResultsWe included 1079 participants with ischemic stroke and 1079 matched controls. Due to a non-linear relationship, the analyses were stratified by 25(OH)D3. For those with 25(OH)D3 < 20 ng/mL, there was a 15% reduction in the risk of ischemic stroke for each SD increment in 25(OH)D3 (odds ratio, 0.85; 95% confidence interval, 0.73–0.99). Compared with the lowest-tertile group, the risk of ischemic stroke decreased by 39% (odds ratio, 0.61; 95% confidence interval, 0.41–0.89) in the highest-tertile group. Furthermore, two effect modifiers were identified: diabetes and homocysteine level. Although participants with 25(OH)D3 ≥ 20 ng/mL had the lowest risk of ischemic stroke overall, there was no dose-response association within that range. ConclusionsAn inverse dose-response association between 25(OH)D3 and incident risk of ischemic stroke in rural Chinese adults was only observed in those with 25(OH)D3 < 20 ng/mL, along with two effect modifiers. Higher levels of 25(OH)D3 did not confer additional benefit.

Quantitative analysis of vitamin D using m/MALDI-TOF mass spectrometry based on a parylene matrix chip

Vitamin D deficiency is associated with various disorders and is diagnosed based on the concentration of 25-hydroxy vitamin D3 (25(OH)D3) in serum. The parylene matrix chip was fabricated to reduce the matrix background noise, and the homogenous distribution of the matrix was retained for the quantitative analysis of 25(OH)D3. The Amplex Red assay was performed to confirm that the sample-matrix mixing zone of the parylene matrix chip was formed below the surface of the parylene-N film. The homogeneous distribution of the matrix was verified from the fluorescence image. For effective analysis using a parylene matrix chip, 25(OH)D3 was modified through the nucleophilic addition of betaine aldehyde (BA) to form a hemiacetal salt. Such modified 25(OH)D3 with a positive charge from BA could be effectively analyzed using MALDI-TOF mass spectrometry. Serum 25(OH)D3 was extracted by liquid–liquid extraction (LLE) and quantified using MALDI-TOF mass spectrometry based on the parylene matrix chip. The intensity of the mass peak of 25(OH)D3 was linearly correlated (r2 = 0.992) with the concentration of 25(OH)D3 spiked in serum, and the LOD was 0.0056 pmol/μL. Energy drinks and vitamin D3 tablets were also employed for the real sample analysis. Finally, the results of the chemiluminescence binding assay and MALDI-TOF mass spectrometry were statistically analyzed to determine the applicability of the method using the Bland–Altman test and Passing–Bablok regression.

SARS-CoV-2 Infection Is Associated with Vitamin D Deficiency in C&amp;#244;te d’Ivoire

In 2019, the coronavirus pandemic broke out as a serious public health issue worldwide. In Côte d’Ivoire, the number of cases of COVID-19 has increased rapidly. The Severe Acute Respiratory Syndrome virus (SARS-CoV-2) binds to angiotensin converting enzyme 2 (ACE2) receptors in the respiratory tracts and enters the respiratory and alveolar cells of infected patients. Deficiency of fat-soluble vitamin D3 is associated with respiratory distress syndrome and pulmonary fibrosis by activation of the renin-angiotensin system. In Côte d’Ivoire, very little research is being done on SARS-CoV-2 and vitamin D. The objective of this study was to assess the vitamin D status of people infected and suffering from COVID-19 in order to contribute to their medical treatment. The study involved 100 adults infected with SARS-CoV-2 (24 women and 76 men). After confirmation of the patient’s SARS-CoV-2 status by RT-PCR, the 25 (OH) vitamin D assay was performed on the Cobas 6000 device and compared to control subjects, the non-COVID-19 positive. A significant decrease in 25-hydroxy vitamin D3 concentrations (44 ± 1.29 nmole/L) was observed in patients infected with SARS-CoV-2, compared to control (78 ± 0.68 nmole/L) (p 3 deficiency requires vitamin D supplementation in the management of hospitalized patients infected with SARS-CoV-2.

Impact of Vitamin D3 Supplementation on Recurrent Aphthous Ulcer

Vitamin D is a well-known secosteroid hormone, which exerts multiple essential roles in bone physiology, cell growth and differentiation, the neuromuscular system, immunomodulatory functions and autoimmune diseases. Deficiency of vitamin D has been linked to many oral disorders including tooth decay, periodontitis, oral cancer, oral candidiasis, oral lichen planus and recurrent aphthous ulcers. Many studies have revealed a significant lower serum vitamin D level in recurrent aphthous ulcer patients compared with healthy volunteers. This proposes that vitamin D supplementation may reduce the severity of the lesion. To evaluate the efficacy of vitamin D3 replacement on recurrent aphthous ulcer severity is the objective of the study. This study involved 65 patients with idiopathic minor recurrent aphthous ulcer and vitamin D deficiency/insufficiency. These patients received vitamin D3 supplement over 1 y. Severity of the disease was delineated by the duration of episodes, the number of ulcers per attack and the frequency of recurrence. Severity parameters were compared before and after vitamin D3 intake. In addition, 25-hydroxy vitamin D3 concentrations were measured before and after administration of vitamin D3 by enzyme-linked immunosorbent assay technique. We found a significant decrease in the frequency of attacks and the number of ulcers in each attack with p-value<0.05 following vitamin D replacement. Moreover, a highly significant lowering in the duration of episodes was detected with p-value<0.001. Gender specific analysis showed no statistically significance regarding severity parameters at any point of the study stages. Correlation studies revealed the only detectable correlation was between serum 25-hydroxy vitamin D3 level at baseline and the number of ulcers before and after vitamin D correction. Vitamin D3 supplementation has a safe and positive impact on improving the severity of recurrent aphthous ulcer with regards to the number of lesions, the frequency of recurrence and the duration of episodes, in patients who have vitamin D deficiency/insufficiency.

Modulation of Plasma 25-Hydroxyvitamin D3 Level by Imatinib Mesylate in Patients with Chronic Myelogenous Leukemia: The Role of Uptake and Efflux Transporters

BackgroundVitamin D deficiency is a common side effect of imatinib mesylate (IM) therapy. Transporter polypeptides involved in the disposition of IM may be required for maintenance of adequate vitamin D concentrations.ObjectiveThe aim of the present work is to study the association between the plasma concentrations of IM and plasma 25-hydroxyvitamin (25[OH]) D3 with transporter genotypes in patients with chronic myelogenous leukemia.MethodsA total of 77 adult patients with chronic myelogenous leukemia treated with IM participated in this study. Peak and trough plasma IM and 25(OH) vitamin D3 concentrations were measured and compared to the results of single nucleotide polymorphisms of the efflux transporting gene ABCB1-1236 C>T and the uptake transporting gene OATP1B3-334 T>G. Multiple linear regressions were used to examine the associations between 25(OH) vitamin D3 concentrations and a number of patient characteristics, including responses to therapy. Binary logistic regression analysis was used to predict odd ratios for the clinical response to IM.ResultsPlasma 25(OH) vitamin D3 concentration quartile values were: 25%, 8.2 ng/mL; 50%, 9.8 ng/mL; and 75%, 12 ng/mL. High IM peak concentration, being OATP1B3-334 T>G (TT), and/ or ABCB1-1236 C>T (CT) are associated with lower concentrations of 25(OH) vitamin D3. Moreover, IM peak concentration, IM trough concentration, and plasma concentration of 25(OH) vitamin D3 were associated with the clinical response to IM.Conclusionsvitamin D, IM concentration, as well as the genotype of OATP1B3-334 T>G, had an influence on the response of patients with chronic myelogenous leukemia.

Fat-Soluble Vitamin Supplementation Using Liposomes, Cyclodextrins, or Medium-Chain Triglycerides in Cystic Fibrosis: A Randomized Controlled Trial.

Fat-soluble vitamin deficiency remains a challenge in cystic fibrosis (CF), chronic pancreatitis, and biliary atresia. Liposomes and cyclodextrins can enhance their bioavailability, thus this multi-center randomized placebo-controlled trial compared three-month supplementation of fat-soluble vitamins in the form of liposomes or cyclodextrins to medium-chain triglycerides (MCT) in pancreatic-insufficient CF patients. The daily doses were as follows: 2000 IU of retinyl palmitate, 4000 IU of vitamin D3, 200 IU of RRR-α-tocopherol, and 200 µg of vitamin K2 as menaquinone-7, with vitamin E given in soybean oil instead of liposomes. All participants received 4 mg of β-carotene and 1.07 mg of vitamin K1 to ensure compliance with the guidelines. The primary outcome was the change from the baseline of all-trans-retinol and 25-hydroxyvitamin D3 concentrations and the percentage of undercarboxylated osteocalcin. Out of 75 randomized patients (n = 28 liposomes, n = 22 cyclodextrins, and n = 25 MCT), 67 completed the trial (89%; n = 26 liposomes, n = 18 cyclodextrins, and n = 23 MCT) and had a median age of 22 years (IQR 19–28), body mass index of 20.6 kg/m2 [18.4–22.0], and forced expiratory volume in 1 s of 65% (44–84%). The liposomal formulation of vitamin A was associated with the improved evolution of serum all-trans-retinol compared to the control (median +1.7 ng/mL (IQR −44.3–86.1) vs. −38.8 ng/mL (−71.2–6.8), p = 0.028). Cyclodextrins enhanced the bioavailability of vitamin D3 (+9.0 ng/mL (1.0–17.0) vs. +3.0 ng/mL (−4.0–7.0), p = 0.012) and vitamin E (+4.34 µg/mL (0.33–6.52) vs. −0.34 µg/mL (−1.71–2.15), p = 0.010). Liposomes may augment the bioavailability of vitamin A and cyclodextrins may strengthen the supplementation of vitamins D3 and E relative to MCT in pancreatic-insufficient CF but further studies are required to assess liposomal vitamin E (German Clinical Trial Register number DRKS00014295, funded from EU and Norsa Pharma).