No description available.

Background: Suicide rates among Alaska Natives in rural Alaska are almost 16 times higher than the national average. Some studies in northern latitudes have shown seasonal variation among suicide rates, with differences in patterns by age and sex, reasons for this variation and contributing factors are unclear. We modeled our hypotheses based on the assumption that vitamin D deficiency influences seasonal variation of suicide. We assessed the relationship between age, sex and seasonal variation of suicidal behavior in a rural region of Alaska. Methods: We utilized data from 804 individuals who exhibited lethal and nonlethal suicidal behavior (1990-2009). Information on age, sex, and potential contributing factors were recorded via a case report. We used multivariable logistic regression to identify the association between age, sex, and seasonality of suicide. Results: Among women, we observed a significant 41% increase in odds during season two compared to season one (OR=1.41, CI=1.06, 1.90); women had a significant 48% increase in odds during season two using data collected between 2002-2009 (OR=1.48, CI=1.04, 2.11). We did not observe any significant findings of seasonality with respects to age. The observed seasonal variation of suicide did not support vitamin D deficiency as an underlying cause, as increased incidence of suicide continued into the summer months when vitamin D deficiency would be less prevalent. Conclusion: We observed evidence of seasonal variation of suicidal acts by sex. Future studies of physiologic mechanisms influencing seasonality of suicide are important to target those at highest risk throughout the year.

Abstrakt BakgrundProstatacancer är ett mycket vanligt tillstånd som påverkar miljoner människor varje år över världen. Faktum är att cancer är en grupp med cirka 200 olika sjukdomar som orsakas av okontrollerad celltillväxt och dessa celler delar sig okontrollerat tills en tumör uppkommer vilken kan sprider sig över hela kroppen. Cancer beror på fel som uppstår i DNA, så kallade mutationer. Prostatacancer är en av de vanligaste orsakerna till cancerdödlighet hos män, det vill säga att chanser att bota sjukdomen är större om diagnosen sker tidigt i förloppet.SyftetSyftet med detta arbete är att undersöka om vitamin D kan påverka utvecklingen av prostatacancer. Metoden och MaterialI denna arbetet gjordes på litteraturstudien genom sökord i PubMed. Efter de artikelsökningen gjordes om mitt arbete är baserat på sex artiklar och att dessa identifierade med hjälp av databasen PubMed och specifika sökord i kombination med inkludering-och exkluderingskriterier.Resultat Studien har visat att låga nivåer av vitamin D kan också kopplats till en ökad risk för prostatacancer. Det har visat att patienter med prostatacancer medelhöga eller höga vitamin D nivåer i blodet kan vara kopplade till bättre resultat än lägre nivåer det vill säga att högre nivåer av vitamin D är associerat med förbättrad överlevnad. Resultatet redovisade av de artiklarna att vitamin D påverkar utvecklingen av prostatacancer genom att bromsa utvecklingen av cancer.slutsatsI denna litteraturstudie har visat att det finns ett samband mellan 25-hydroxivitamin D och 1,25-dihroxivitamin D är skydda mot patienter som lever med prostatacancer. Det har majoriteten visat på att män med förhöjda av 1,25-dihroxivitamin D, vilket ger bättre överlevnad.

Autism Spectrum Disorder (ASD) is characterized by a variety of social, sensory, and developmental symptoms. It is estimated that there are 66 cases per 10,000 children in the United States, placing the U.S. in the top ten countries with the highest prevalence of autism. Japan currently has the highest rate at 161 cases per 10,000. There is currently no known cure for this developmental disorder and the diagnostic protocol is not very clear. Those diagnosed are likely to face years of therapy and exposure to different medications to treat the symptoms. However, one risk factor that has received more attention in recent studies is that of Vitamin D and its relationship with ASD. It has been shown that environmental factors can lead to gene expression changes that may affect social behaviors, a core deficit of ASD. Vitamin D deficiencies during development can lead to the upregulation of DNA-repair genes and maternal deficiencies during pregnancy which may inhibit gene repair in the developing fetus. Deficits in Vitamin D have been linked to an increase in the autoimmune response of the body and are thought to lower the immune system’s attack on infections. Quantitative PCR was used to evaluate vitamin D receptor expression in human and mouse homogenate brain tissue punches from the cingulate cortex to determine Vitamin D receptor expression levels. Associations between Vitamin D and ASD may bring us one step closer to determining whether a simple addition of Vitamin D during the prenatal period could help decrease the risk of a developmental disorder such as autism.

Objective: This study was conducted to investigate the relationship between hip bone mineral density (BMD), fat free mass (FFM), fat mass (FM), and total body mass (TBM) and the extent to which these relationships were modified by various confounding factors. The cross-sectional analysis included 262 healthy females (mean age 41.6±3.0 years). Methods: BMD of the hip and body composition were assessed by the Hologic 4500W dual energy x-ray absorptiometry (DXA) system. Total and intensity of physical activity (PA) were objectively measured using an Actigraph accelerometer. Dietary calcium and vitamin D from food and beverages, as well as from supplements, were measured separately using the Block food frequency questionnaire. Menopause status and prescription bone drug use were measured by a questionnaire. Results: The relationship between FFM and hip BMD was strong and robust (F=24.5, P<0.0001). Using the pooled standard deviation revealed a large effect size of 1.2 when comparing hip BMD of women with low FFM and high FFM. Potentially confounding variables, considered individually and collectively, did not change this relationship. The association between FM and hip BMD was also substantial (F=9.9, P<0.0001) and remained significant when controlling for all potentially confounding variables, except differences in FFM. The relationship between TBM and hip BMD was also strong and dose-response (F=21.5, P<0.0001) and remained significant, except when differences in FFM were controlled. Conclusion: The relationships between body mass (total, fat, and fat free) and BMD of the hip in middle-age women are strong and significant. The associations are not influenced by differences in age, height, menopause status, calcium or vitamin D intake, volume or intensity of PA, or the use of bone enhancing prescription drugs. The findings suggest that women with low body mass, particularly low FFM, tend to have low hip BMD and there is little that can be done to change this association.

BACKGROUND: Vitamin D deficiency and insufficiency are rising healthcare concerns in the United States (US) and worldwide. The latest data collected by the National Health and Nutrition Examination Surveys (NHANES) between 2002-2006 showed that approximately one third of Americans over one-year-old were vitamin D deficient (serum 25-hydroxy vitamin D (25-OHD) < 12 ng/mL) or insufficient (serum 25-OHD < 20 ng/mL) (Looker et al., 2011). Environmental exposures, acute or chronic disease, and genetics can exacerbate vitamin D deficiency. People with malabsorptive disorders such as Inflammatory Bowel Disease (IBD) are at an even greater risk of becoming vitamin D deficient. Pediatric patients with IBD are particularly vulnerable to the short and long-term effects of vitamin D deficiency, given the prominent role played by this agent on skeletal development. More recent data have demonstrated that vitamin D also plays an important role in maintaining and regulating the immune system. For this reason, investigators have been interested in a better understanding of the relationship between vitamin D and inflammation. Vitamin D may prove to be an important adjunct therapy for people suffering from IBD and other autoinflammatory diseases. OBJECTIVES: Many patients and medical providers understand the importance that vitamin D has in a growing child’s skeletal development. However, compliance with daily supplementation remains low. The design of this study allows patients to receive high-dose vitamin D supplementation during scheduled biologic infusions. The goal is to assess the safety and efficacy of high-dose interval vitamin D therapy. The secondary goal of this study will be to determine if optimal vitamin D levels impact the inflammation observed in the gastrointestinal (GI) tract of patients with IBD. METHODS: 60 patients with IBD, between 5-25 years of age, who received regularly scheduled infliximab or vedolizumab infusions, and had serum 25-OHD levels below 30 ng/mL were recruited for the study. These patients were screened for the exclusion criteria, including underlying liver or kidney disease. Enrolled participants were given eight high-dose oral vitamin D3 supplements during scheduled infliximab or vedolizumab infusions for 8-16 months. Serum 25-OHD levels, urine calcium and creatinine levels, and research blood samples were collected at baseline, midpoint, and final visits. Questionnaires were also dispensed to patients to measure quality of life (QoL). This data was collected and analyzed to assess the safety and efficacy of high-dose interval vitamin D supplementation in pediatric patients with IBD. RESULTS: The data from this study showed statistical significance in the change of serum-25OHD level from baseline to midpoint and final visits. The mean increase from baseline to midpoint was 15.71±10.1 ng/mL for the 30 participants who had completed 3 study doses (2,500 mCg or 5,000 mCg) (mean±95% CI). The mean increase from baseline to final visit was 18.1±11.67 ng/mL for the 19 participants who completed all 7 study doses (2,500 mCg or 5,000 mCg) (mean±95% CI). A single factor ANOVA test confirmed statistical significance with p < 0.0001. Urine calcium and creatinine levels did not have a statistically significant change from baseline to final visit for the 12 participants who had completed both samples. Lastly, IMPACT-III QoL scores were not significantly different from baseline. However, there was an overall increase in the mean scores in all 6 subcategories of the survey. As more participants complete the study, the statistical significance and the validity of results will likely be strengthened. CONCLUSION: High-dose interval vitamin D supplementation was a safe and effective way to achieve serum 25-OHD levels to an optimal range (i.e., 40-60 ng/mL) in pediatric patients and young adult patients with IBD. The data suggests that three doses of high-dose vitamin D may be sufficient to bring levels to an optimal and stable plateau. Patient compliance with supplementation was 100% in this study, because of provider-observed ingestion of vitamin D. Patients also noted that this was their preferred method of supplementation. The safety and efficacy results of this study serve as a framework for developing a more standard approach to vitamin D supplementation for our patients with IBD. Future studies may benefit from expanding this method of delivery to patients who have other inflammatory diseases that require both regular oral vitamin D therapy and in person visits for treatments (i.e., intravenous (IV) medication).

京都大学 / 新制・課程博士 / 博士(医学) / 甲第24287号 / 医博第4903号 / 新制||医||1061(附属図書館) / 京都大学大学院医学研究科医学専攻 / (主査)教授 寺田 智祐, 教授 松田 道行, 教授 YOUSSEFIAN Shohab / 学位規則第4条第1項該当 / Doctor of Medical Science / Kyoto University / DFAM

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To investigate the influence of two dietary sources of vitamin D on the vitamin D status, bone metabolism, welfare and birth progress of gestating and lactating sows, forty-nine multiparous sows were randomly assigned to one of two diets: “CON” (n = 25; 50 g vitamin D3/kg feed) and “HYD” (n = 24; 50 g 25-hydroxycholecalciferol/kg feed). The basal diets were protein- and phosphorus-reduced. The trial started on day 3 ante insemination of the sows and ended with weaning of the piglets on day 28 postpartum. Dietary supplementation of 25-hydroxycholecalciferol resulted in improved maternal vitamin D status (p < 0.001), fewer gait changes (p < 0.01) and longer standing time after feeding (day 5 ante partum; p < 0.05) compared to vitamin D3. However, the bone markers CrossLaps and osteocalcin were not affected. Overall, the present results suggest that sows fed 25-hydroxycholecalciferol instead of vitamin D3 showed improved locomotion and stance strength. However, this outcome is probably not related to altered bone metabolism. The underlying mechanisms must be investigated in further studies.

Vitamin D deficiency due to, e.g., nutritional and life style reasons is a health concern that is gaining increasing attention over the last two decades. Vitamin D3, the most common isoform of vitamin D, is only available in food derived from animal sources. However, mushrooms and yeast are rich in ergosterol. This compound can be converted into vitamin D2 by UV-light, and therefore act as a precursor for vitamin D. Vitamin D2 from UV-irradiated mushrooms has become an alternative source of vitamin D, especially for persons pursuing a vegan diet. UV-irradiated baker’s yeast (Saccharomyces cerevisiae) for the production of fortified yeast-leavened bread and baked goods was approved as a Novel Food Ingredient in the European Union, according to Regulation (EC) No. 258/97. The Scientific Opinion provided by the European Food Safety Authority Panel on Dietetic Products, Nutrition, and Allergies has assessed this Novel Food Ingredient as safe under the intended nutritional use. However, recent findings on the formation of side products during UV-irradiation, e.g., the photoproducts tachysterol and lumisterol which are compounds with no adequate risk assessment performed, have only been marginally considered for this EFSA opinion. Furthermore, proceedings in analytics can provide additional insights, which might open up new perspectives, also regarding the bioavailability and potential health benefits of vitamin D-fortified mushrooms and yeast. Therefore, this review is intended to give an overview on the current status of UV irradiation in mushrooms and yeast in general and provide a detailed assessment on the potential health effects of UV-irradiated baker’s yeast.