Impact Of Vitamin Research Articles

The Impact of Vitamin D in the Treatment of Essential Hypertension.

The aim of this review is to investigate, whether there is a possible link between vitamin D supplementation and the reduction of blood pressure in hypertensive patients. The renin-angiotensin-aldosterone system is known for being deeply involved in cardiovascular tonus and blood pressure regulation. Hence, many of the pharmaceutical antihypertensive drugs inhibit this system. Interestingly, experimental studies in mice have indicated that vitamin D supplementation significantly lowers renin synthesis and blood pressure. It is conceivable that similar mechanisms may be found in the human organism. Regarding this, large-scale cross-sectional studies suggest the serum 25(OH)D-level to be inversely correlated to the prevalence of hypertension. However, randomized controlled trials (RCTs) have not found a clear association between vitamin D supplementation and improvements in hypertension. Nevertheless, the missing association of vitamin D and hypertension in clinical trials can be due to suboptimal study designs. There are hints that restoration of serum 25(OH)D levels during vitamin D therapy is essential to achieve possible beneficial cardiovascular effects. It is important to perform long-term trials with a short dose interval and a high bioavailability of supplementation. Taken together, more RCTs are required to further investigate if vitamin D can be beneficial for the reduction of blood pressure.

Impact of vitamin D receptor and binding protein gene polymorphisms in clinical and laboratory data of HCV patients: Cross sectional study.

Potential relationship of vitamin D, vitamin D receptor (VDR), and vitamin D binding protein (DBP) have been suggested in the pathophysiology of hepatitis C virus (HCV) infection. The aim of this observational study is to determine vitamin D levels, and VDR and DBP genetic polymorphism according demographic and laboratory data in chronic HCV patients (CHC).A total of 148 CHC patients gave serum samples for testing 25-hydroxyvitamin D (25 (OH)D) level by immunochemiluminometric assay (<20 ng/mL defined as deficient) and donated blood samples to allelic discrimination analysis using TaqMan assays. Analyzed single nucleotide polymorphisms (SNPs) were: VDR-rs7975232 (ApaI) C>A, rs731236 A>G (TaqI), rs1544410 C>T (BsmI), rs10735810 T>C (FokI) and carrier globulin/binding protein (GC)-rs4588 and rs7041 and the haplotype bAt [CCA]. Hepatic fibrosis was assessed using Fib-4 and Forns index.Eighty-two (54.40%) patients demonstrated deficiency of vitamin D and this was associated to AST (P = .019 [CI: 1.003–1.034]), total cholesterol (P = .038 [CI: 1.004–1.164]), fibrosis grade (P < .001 [CI: 0.000–0.844]), and FokI (P = .028) allele T presence. Association was found between VDR polymorphism and fibrosis (BsmI andTaqI), triglycerides (TaqI), and HDL (FokI). DBP polymorphism was associated to HCV genotype (GC rs7041), previous HCV treatment, and GGT (GC rs4588).In conclusion, low frequency of vitamin D deficiency was found, but VDR polymorphisms were frequently associated to fibrosis grade suggesting that they could be used as disease evaluation markers to understand the mechanisms underlying the virus–host interaction.

Witamina D jako związek o działaniu plejotropowym – przegląd aktualnych badań

Witamina D tradycyjnie łączona jest z mineralizacją ludzkiego kośćca. Udowodniono jednak, iż nie jest to jedyna rola w organizmie, którą odgrywa. Identyfikacja receptora witaminy D, odpowiadającego za aktywność biologiczną witaminy D i jednocześnie znajdującego się w wielu tkankach, pozwoliła na potwierdzenie plejotropowego, czyli wielokierunkowego oddziaływania aktywnej formy witaminy D (kalcytriolu). Przyczyniło się to z kolei do intensyfikacji badań in vivo i in vitro z zakresu wpływu niedoborów witaminy D na poszczególne układy organizmu człowieka. Dzięki nim potwierdzono, iż zbyt niskie stężenie witaminy D w surowicy krwi wiąże się ze zwiększonym ryzykiem wystąpienia m.in. schorzeń układu sercowo-naczyniowego, oddechowego, immunologicznego, nerwowego czy niektórych nowotworów. Jest to wiedza niezwykle ważna, głównie ze względu na fakt, iż zdecydowana większość populacji narażona jest na niedobory tej witaminy.

High Serum Retinol as a Relevant Contributor to Low Bone Mineral Density in Postmenopausal Osteoporotic Women.

There is controversial information about the impact of vitamin A on bone. Some epidemiological studies show that excessive intake of vitamin A, or an excess of serum vitamin A, has related with adverse impact on bone mass; however, other studies did not find these links, and some authors have proposed that this vitamin might promote a better bone health. The present work aims to contribute to clarify the real role of vitamin A in bone tissue. For this purpose, a cross-sectional study of 154 osteoporotic non-treated postmenopausal women (> 65years old) was carried out. Bone mineral density (BMD) was measured by dual-energy X-ray absorptiometry. We assessed concentrations of serum retinol, osteocalcin, parathyroid hormone, alkaline phosphatase, calcium, and phosphorus. We also studied demographic and anthropometric parameters. Spearman's correlations between retinol levels and other variables found negative correlations with BMD in both lumbar spine (R=- 0.162, P < 0.01) and femoral neck (R=- 0.182, P < 0.01), as well as alkaline phosphatase (R=- 0.110; P < 0.05) and phosphorus (R=- 0.110; P < 0.05). A positive correlation between retinol and fertile window was observed (R = 0.158; P < 0.01). After multivariable adjustment, we still found a negative correlation between serum retinol and BMD, both at the lumbar spine (R=- 0.210; P < 0.01) and at the femoral neck (R=- 0.324, P < 0.001). It is concluded that elevated serum-retinol levels are associated with an increased risk of low bone mass and thus with osteoporotic fractures. Therefore, osteoporosis-risk assessment should include quantification of serum metabolite of vitamin A.

Vitamin D deficiency and its relationship with cardiac iron and function in patients with transfusion-dependent thalassemia at Chiang Mai University Hospital

ABSTRACTBackground: Vitamin D deficiency is common in patients with thalassemia. Vitamin D deficiency could be related to cardiac dysfunction. Increased parathyroid hormone (PTH) is also known to be associated with heart failure. Objectives: To determine the prevalence of Vitamin D deficiency and to explore the impact of Vitamin D deficiency on cardiac iron and function in patients with transfusion-dependent thalassemia. Method: A cross-sectional study in patients with Transfusion-dependent thalassemia was conducted. Patients with liver disease, renal disease, type 1 diabetes, malabsorption, hypercortisolism, malignancy, and contraindication for MRI were excluded. Calcium, phosphate, PTH, vitamin D-25OH were measured. CardiacT2* and liver iron concentration (LIC) and left ventricular ejection fraction (LVEF) were determined. Results Sixty-one (33M/28F) patients with Transfusion-dependent thalassemia were enrolled. The prevalence of Vitamin D deficiency was 50.8%. Patients with cardiac siderosis had tendency for lower D-25OH than those without siderosis (15.9 (11.7–20.0) vs. 20.2 (15.85–22.3) ng/mL); p = 0.06). Serum calcium, phosphate, PTH, LIC, cardiac T2*, and LVEF were not different between the groups with or without Vitamin D deficiency. Patients with Vitamin D deficiency had significantly lower hemoglobin levels compared to those without Vitamin D deficiency (7.5 (6.93–8.33) vs. 8.1 (7.30–8.50) g/dL; p = 0.04). The median hemoglobin in the last 12 months was significantly correlated with D-25OH. Cardiac T2* had significant correlation with PTH. Conclusion: Vitamin D deficiency is prevalent in patients with Transfusion-dependent thalassemia. Vitamin D level is correlated with hemoglobin level. Vitamin D status should be routinely assessed in these patients. Low PTH is correlated with increased cardiac iron. This study did not demonstrate an association between Vitamin D deficiency and cardiac iron or function in patients with Transfusion-dependent thalassemia.

The impact of vitamin D fortification of staple food for children: A systematic review and metaanalysis

The impact of vitamin D fortification of staple food for children: A systematic review and metaanalysis

Влияние дефицита витамина D на клинические проявления муковисцидоза у детей Московского региона

Влияние дефицита витамина D на клинические проявления муковисцидоза у детей Московского региона

Impact of vitamin D depletion during development on mouse sperm DNA methylation

Impact of vitamin D depletion during development on mouse sperm DNA methylation

The impact of vitamin A fortified vegetable oil on vitamin A status of children under five years of age: A cohort study

Latar belakang: Defisiensi vitamin A sub-klinis dan anemia merupakan masalah gizi utama di Indonesia. Meski pemerintah telah melaksanakan program distribusi kapsul vitamin A, masih ada sepertiga anak yang tidak mendapatkan distribusi vitamin A. Penelitian ini bertujuan untuk mengukur efektivitas fortifikasi vitamin A pada minyak goreng tidak bermerek di antara kohort anak-anak keluarga miskin berusia 6-59 bulan di dua kabupaten di Indonesia sebelum mendapat fortifikasi vitamin A dalam minyak goreng. Metode: Jumlah sampel sebanyak 126 anak. Darah vena diambil oleh phlebotomist terlatih. Serum retinol dan hemoglobin diukur pada awal sebelum fortifikasi minyak goreng dan 12 bulan setelah intervensi. Tidak ada intervensi dari tim peneliti mengenai distribusi dan pembelian minyak goreng, karena minyak goreng didistribusikan dan dijual melalui mekanisme pasar yang ada. Enumerator terlatih mengumpulkan variabel sosio-demografi. Mereka juga mengumpulkan recall makanan 24 jam dan kuesioner frekuensi makanan untuk mengukur asupan nutrisi pada awal dan akhir penelitian. Hasil: Serum retinol meningkat secara signifikan sebesar 5,07, 6,82, 6,01 μg / dL pada anak usia 6-11, 12-23, dan 24-59 bulan. Hemoglobin meningkat sebesar 0,13 (p> 0,05), 0,56 (p <0,05), 0,81 g / dL (p <0,05) pada anak usia 6-11, 12-35, 36-59 bulan. Kesimpulan: Fortifikasi vitamin A dalam minyak goreng secara bermakna meningkatkan serum retinol pada balita di semua kelompok umur dan hemoglobin hanya pada kelompok usia 12 bulan ke atas. Kata kunci: defisiensi vitamin A, fortifikasi vitamin A, minyak goreng Abstract Introduction: Sub-clinical vitamin A deficiency (VAD) and anemia remain major nutritional problem in Indonesia. Although the government has implemented distribution of vitamin A capsules (VAC), there are one third of children missed VAC distribution. This study aimed to measure the effectiveness of vitamin A fortification in unbranded cooking oil among cohort of 6-59-month-old children of poor families in 2 districts in Indonesia prior mandatory vitamin A fortification in cooking oil. Methods: Total number of samples were 126 children. Venous blood was drawn by trained phlebotomist. Serum retinol and hemoglobin were measured by HPLC and hemoque respectively at baseline just before cooking oil fortification and 12 months after at endline. There was not any intervention from the study team on distribution and purchase of fortified cooking oil by the families, because cooking oil was distributed and sold through exsisting market mechanism. Enumerators collected socio-demographic variables. They also collected 24-hr dietary recall and food frequency questionnaires to measure nutrient intakes at base- and endline. Results: Serum retinol significantly increased by 5.07, 6.82, 6.01 µg/dL in 6-11, 12-23, and 24-59 month-old children respectively. Hemoglobin increased by 0.13 (p>0.05) , 0.56 (p<0.05), 0.81 g/dL (p<0.05) in 6-11, 12-35, 36-59 month-old children respectively. Conclusion: Vitamin A fortification in cooking oil significantly improved serum retinol in underfive children in all age groups and hemoglobin only in older age groups. Keywords: vitamin A deficiency, anemia, vitamin A fortification, cooking oil

Assessment of the Protective Impact of Vitamin E on Sex Hormones and Sperm Parameters of Formaldehyde-treated Male Rats: A Preliminary Investigation

Background: Lifestyle factors, including environmental and occupational exposure, have a key role in reproductive health status and may impact fertility. Formaldehyde (FA) is a suspected reproductive toxicant, which may cause significant adverse effects on the reproductive system. This study was aimed at detecting the impact of FA and the possible protective role of vitamin E on the male reproductive system in rats. Materials and Methods: Thirty-two adult male Wistar rats were randomly divided into four groups: control rats, rats treated with vehicle (corn-oil), rats treated with 10 mg/kg/day FA (FAt), and rats treated with FA plus 30 mg/kg/day vitamin E plus vehicle (FAt+ vitamin E) for two weeks. After treatment, sex hor­mone levels were examined using ELISA. Moreover the count, morphology, and motility of sperm, were observed. Results: The sperm count and the percentage of rapid progressive sperm were significantly decreased in rats in the FAt-treated group compared with those in the control and vehicle-treated groups (p&lt;0.05). Vitamin E treatment significantly improved the parame­ters examined in the FAt+ vitamin E group (29.85±8.62 vs. 10.04±4.79 for sperm count and 60.50±5.67 vs. 42.19±8.02 for sperm motility). Moreover, serum follicle-stimulating hormone (FSH) levels mildly decreased in the FA exposure group, although the difference was not statis­tically significant (p&gt;0.05). Conclusion: The findings of this study revealed that FA exposure had a negative impact on sperm parameters and some reproductive hormones in rats and vita­min E attenuated the deleterious impact of FA on the reproductive system of adult male rats. [GMJ.2017;6(4):330-7] DOI: 10.22086/gmj.v6i4.904

Vitamin D and Multiple Sclerosis: A Comprehensive Review.

Numerous observational studies have suggested that there is a correlation between the level of serum vitamin D and MS risk and disease activity. To explore this hypothesis, a literature search of large, prospective, observation studies, epidemiological studies, and studies using new approaches such as Mendelian randomization was conducted. Available data and ongoing research included in this review suggest that the level of serum vitamin D affects the risk of developing MS and also modifies disease activity in MS patients. Newer Mendelian randomization analyses suggest there is a causal relationship between low vitamin D level and the risk of MS. Post-hoc evaluations from two phase 3 studies, BENEFIT and BEYOND, support the findings of observational trials. Study limitations identified in this review recognize the need for larger controlled clinical trials to establish vitamin D supplementation as the standard of care for MS patients. Though there is increasing evidence indicating that lower vitamin D levels are associated with increased risk of MS and with greater clinical and brain MRI activity in established MS, the impact of vitamin D supplementation on MS activity remains inadequately investigated.

Epilepsy and osteoporosis risk.

It is well-recognized that individuals with epilepsy have an increased risk of vertebral and nonvertebral fractures; this increased risk has been described to be secondary to an increased bone fragility and to an increased risk of falls. Osteoporosis is the most common bone disease which has been characterized by microarchitectural deterioration of trabecula and cortical bone mass with a decrease in bone mineral density and bone strength. Specific side effects of antiepileptic drugs (AEDs) on bone metabolism have been identified; recent research publications further characterized some of the specific side effects of AEDs on bone metabolism. It is the purpose of this review to describe recent advances on the knowledge of the effects of AEDs on bone metabolism and the cause of osteoporosis in the field of epilepsy. Recent literature demonstrates that the increased risk of fractures in the epileptic patient population is likely multifactorial and includes seizure activity, injuries from falls, decreased bone strength, adverse effects from AEDs. Reviewed publications suggest that the mechanism of adverse effects on bone metabolism may differ among different AEDs. The impact of vitamin D deficiency or its metabolism in the epileptic population has also been a concern of several reviewed publications. This is a review is of the recent epilepsy and osteoporosis literature published over the past 18 months, highlighting reports and studies concerning the cause, pathogenesis, and possible preventive measures and effects of AEDs on changes of bone metabolism, bone loss, and development of osteoporosis. In addition, we also reviewed articles focusing on issues of prevention and treatment of osteoporosis in individuals with epilepsy. We utilized the search engines of PubMed and Cochrane Reviews from January 2016 to June 2017.

Impact of vitamin D supplementation on bacterial vaginosis in pregnancy

Impact of vitamin D supplementation on bacterial vaginosis in pregnancy

Impact of vitamin C supplementation on serum ferritin level in hemodialysis patients

Background: Iron deficiency anemia is common in patients on maintenance hemodialysis (HD). Serum ferritin is increased in HD patients. Vitamin C supplementation has shown to improve functional iron deficiency and anemia in HD patients. Objectives: In this study we aimed to evaluate the effect of vitamin C supplementation on serum ferritin level. Patients and Methods: In this randomized clinical trial, 39 HD patients were randomly assigned to receive routine therapy with (n=24) or without (n=15) vitamin C 500 mg IV twice a week after each dialysis session for 2 months. Changes in serum ferritin, iron, total iron-binding capacity (TIBC) and transferrin saturation (TS) before and after treatment were measured in each group. Results: Serum ferritin levels before treatment in case and control groups were 1859±1398.5 and 2567.5±1907.8 ng/mL which was significantly decreased to 1084.8±727.9 and 1313.5±1151.5 ng/mL, respectively (P=0.006 and P=0.007). Serum iron, TIBC and TS did not change significantly in each group after treatment. Comparing the mean changes in serum ferritin, iron, TIBC and TS, there was no significant difference between groups. Conclusions: Vitamin C had no effects on serum ferritin, iron and TS.

The independent effects of vitamin D deficiency and house dust mite exposure on lung function are sex-specific

Vitamin D deficiency is increasing around the world and has been associated with the development of asthma. This study aims to evaluate the effect of dietary vitamin D deficiency at different life stages on lung function using a murine model of allergic airways disease. BALB/c mice were challenged intranasally with HDM or saline alone for 10 days. Twenty four hours after the last challenge, mice were anesthetized and lung function was measured using the forced oscillation technique (FOT). Mice were euthanized for assessment of inflammation in the bronchoalveolar lavage (BAL) and total collagen content in lung homogenates by ELISA. Vitamin D deficiency impaired lung function in both male and female mice, increasing tissue damping and elastance, however had no effect on HDM induced inflammation. The impact of vitamin D deficiency was more evident in females. HDM also decreased airway distensibility, but only in females and this response was not altered by vitamin D deficiency. Our data suggest that vitamin D deficiency and HDM exposure have independent effects on lung mechanics and that females are more susceptible to these effects. Vitamin D deficiency may exacerbate lung function deficits by having a direct, but independent, effect on parenchymal mechanics.

The impact of vitamin D status and parameters of calcium metabolism in patients with primary hyperparathyroidism.

There is ample evidence associating vitamin D deficiency in primary hyperparathyroidism (PHP) patients with more severe disease manifestations and increased risk of postoperative hypocalcemia. Yet, there is limited data regarding the safety of vitamin D repletion in these patients. To assess the safety of vitamin D repletion in PHP patients in a real-world setting. We included patients with asymptomatic PHP and few symptomatic patients who declined surgery, followed in our clinic, and treated on a routine basis with 2000 IU/day of vitamin D3. Serum calcium (sCa), PTH, 25-hydroxyvitamin D, and 24 h urinary calcium (uCa) and creatinine collections were compared between the lowest and the highest vitamin D time points. There were 40 patients of a mean age was 63 ± 10 years. 25(OH)D at lowest and highest vitamin D time points was 15.5 ± 6.2 ng/ml and 33.2 ± 8, respectively (P < 0.001). Serum calcium was not affected by the changes in vitamin D levels. In none of the patients did sCa exceed 11.5 mg/dL. uCa was 220 ± 110 mg/24 h at the lowest vitamin D time point and 260 ± 140 at the highest vitamin D time point (P = 0.14). uCa exceeded 400 mg/24 h in two vs. five patients (P = 0.23) at the lowest and highest vitamin D time points, respectively. PTH was not significantly different between the different vitamin D time points. Vitamin D repletion in PHP seems safe. Considering the documented adverse influence of vitamin D deficiency in PHP, particularly on skeletal manifestations and on the postoperative course, vitamin D repletion is warranted.

46 - Impact of vitamin D supplementation on vitamin D level, calcium excretion and bones density in patients with hypercalciuria and vitamin D deficiency

46 - Impact of vitamin D supplementation on vitamin D level, calcium excretion and bones density in patients with hypercalciuria and vitamin D deficiency

The impact of vitamin K standardization in hospital diets

A prospective controlled study evaluating the impact of standardized dietary modifications on vitamin K levels in hospital diets of chronic oral, anticoagulated patients, using warfarin. The intervention group received a diet with a standardized content of vitamin K and the control group received a diet without this standardization. In both, the International Normalized Ratio (INR) was performed according to the medical staff’s protocol, without interference from the research group members. Data on dietary intake of vitamin K, INR, warfarin dosage, and the time taken for normalization of INR were collected. Food intake was evaluated by a 24-hour food recall, starting from the beginning of warfarin use until the normalization of INR. The sample consisted of 55 patients, 29 patients in the control group and 26 patients in the intervention group. The average age was 55.47 ± 17.52 years old, 56.3% were female, and 49.1% were elderly. The coefficient of variation in the consumption of vitamin K was significantly higher in the control group (0.45 ± 0.22) compared to the intervention group (0.31 ± 0.19); p = 0.018. The average dosage of warfarin use was significantly lower in the intervention group (5.30 ± 1.42 mg / day) compared to the control group (6.21 ± 1,84mg / day); p = 0.044. The data showed that a hospital diet with standard amounts of vitamin K reduces the warfarin dosage to normalization of INR in oral anticoagulated patients. This result can reduce the risk of bleeding events, especially in the elderly.

The impact of vitamin D status on hungry bone syndrome after surgery for primary hyperparathyroidism.

Prolonged hypocalcemia but normal intact parathyroid hormone (iPTH) levels after surgery for primary hyperparathyroidism (PHPT) are referred to as 'hungry bone syndrome' (HBS). The aim was to evaluate preoperative risk factors for HBS with a focus on the impact of 25-hydroxyvitamin D (25(OH)D) deficiency. Patients having undergone initial successful surgery for sporadic PHPT within 6 years were considered for retrospective analysis. A total of 385 patients were evaluated, of whom 33 (8.6%) developed HBS influencing negatively the postoperative bone metabolism. All patients underwent biochemical evaluations two days before parathyroid surgery and were followed biochemically on a daily basis in the first postoperative week and thereafter at 8 weeks and 6 months. No relationship was established between preoperative 25(OH)D deficiency and HBS. The only significant risk factor for HBS in multivariable analysis was high levels of preoperative iPTH. As HBS therefore cannot be predicted preoperatively, we recommend a consistent postoperative calcium and vitamin D supplementation to improve the bone metabolism.

Vitamin D deficiency is associated with poor reproductive outcomes in PCOS but not unexplained infertility

The impact of vitamin D deficiency on the success of ovulation induction (OI) cycles and the risk pregnancy complications after OI has not been extensively investigated. The goal of this study was to evaluate the relationship between preconception vitamin D status and reproductive outcomes in women with a diagnosis of either PCOS or unexplained infertility treated with OI.