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Serum Folate

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241. Impact of folate metabolism on Parkinson's disease onset and pathology: a systematic review

Impact of folate metabolism on Parkinson's disease onset and pathology: a systematic review Print | PDF PROSPERO This information has been provided by the named contact for this review. CRD has accepted this information in good faith and registered the review in PROSPERO. CRD bears no responsibility or liability for the content of this registration record, any associated files or external websites. Email salutation (e.g. "Dr Smith" or "Joanne") for correspondence: Organisation web address (...) of administration, route of administration, vehicle. ">Data to be extracted: intervention of interest Example: Serum creatinine; continuous; umol/L (may be recalculated from mg/dL). ">Data to be extracted: primary outcome(s) Example: Blood urea nitrogen; continuous; mmol/L (may be recalculated from mg/dL); Renal histological damage as assessed by Jablonski scale; continuous; Jablonski score. ">Data to be extracted: secondary outcome(s) Example: 1st author, year of publication, language, journal. ">Data

2018 PROSPERO

242. Associations between genetic polymorphisms in the folate metabolic pathway with methotrexate pharmacokinetics and methotrexate-induced toxicities in patients with osteosarcoma: a systematic review

Associations between genetic polymorphisms in the folate metabolic pathway with methotrexate pharmacokinetics and methotrexate-induced toxicities in patients with osteosarcoma: a systematic review Print | PDF PROSPERO This information has been provided by the named contact for this review. CRD has accepted this information in good faith and registered the review in PROSPERO. CRD bears no responsibility or liability for the content of this registration record, any associated files or external (...) of reperfusion (if applicable). ">Data to be extracted: animal model Example: Dose, timing of administration, frequency of administration, route of administration, vehicle. ">Data to be extracted: intervention of interest Example: Serum creatinine; continuous; umol/L (may be recalculated from mg/dL). ">Data to be extracted: primary outcome(s) Example: Blood urea nitrogen; continuous; mmol/L (may be recalculated from mg/dL); Renal histological damage as assessed by Jablonski scale; continuous; Jablonski score

2018 PROSPERO

243. Associations between G80A polymorphism of reduced folate carrier (RFC1) and methotrexate-induced toxicities in patients with hematological malignancies: a systematic review and meta-analysis

Associations between G80A polymorphism of reduced folate carrier (RFC1) and methotrexate-induced toxicities in patients with hematological malignancies: a systematic review and meta-analysis Print | PDF PROSPERO This information has been provided by the named contact for this review. CRD has accepted this information in good faith and registered the review in PROSPERO. CRD bears no responsibility or liability for the content of this registration record, any associated files or external websites (...) ). ">Data to be extracted: animal model Example: Dose, timing of administration, frequency of administration, route of administration, vehicle. ">Data to be extracted: intervention of interest Example: Serum creatinine; continuous; umol/L (may be recalculated from mg/dL). ">Data to be extracted: primary outcome(s) Example: Blood urea nitrogen; continuous; mmol/L (may be recalculated from mg/dL); Renal histological damage as assessed by Jablonski scale; continuous; Jablonski score. ">Data to be extracted

2018 PROSPERO

244. Vitamin B12 and folate levels in healthy Swiss senior citizens: a prospective study evaluating reference intervals and decision limits. (PubMed)

of vitamin B12, holotranscobalamin (holoTC), methylmalonic acid (MMA), homocysteine (Hcy), serum folate, red blood cell (RBC) folate were measured. Further, Fedosov's wellness score was determined. Associations of age, gender, and cystatin C/creatinine-based estimated kidney function, with the investigated parameters were assessed. Reference intervals were calculated. Further, ROC analysis was done to assess accuracy of the individual parameters in recognizing a deficient vitamin B12 status. Finally (...) . In a linear regression model Fedosov's wellness score was independently associated with kidney function (p < 0.001) but not with age. Total serum folate and red blood cell (RBC) folate drift apart with increasing age: whereas the former decreases (p = 0.01) RBC folate remains in the same bandwidth across all age groups (p = 0.12) A common reference interval combining age and gender strata can be obtained for vitamin B12 and holoTC, whereas a more differentiated approach seems warranted for serum folate

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2015 BMC Geriatrics

245. Homocysteine Metabolism Gene Polymorphisms (MTHFR C677T, MTHFR A1298C, MTR A2756G and MTRR A66G) Jointly Elevate the Risk of Folate Deficiency. (PubMed)

aged 28-75 were enrolled in this study from September 2005-December 2005 from six hospitals in different Chinese regions. Known genotypes were detected by PCR-RFLP methods and serum folate was measured by chemiluminescence immunoassay. Our results showed that MTHFR 677TT and MTR 2756AG + GG were independently associated with a higher risk of folate deficiency (TT vs. CC + CT, p < 0.001 and AG + GG vs. AA p = 0.030, respectively). However, the MTHFR A1298C mutation may confer protection by elevating (...) the serum folate level (p = 0.025). Furthermore, patients carrying two or more risk genotypes showed higher odds of folate deficiency than null risk genotype carriers, especially those carrying four risk genotypes. These findings were verified by generalized multifactor dimensionality reduction (p = 0.0107) and a cumulative effects model (p = 0.001). The results of this study have shown that interactions among homocysteine metabolism gene polymorphisms lead to dramatic elevations in the folate

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2015 Nutrients

246. Exploring how dietary intake of folate and metabolically related vitamins changes with age: a systematic review

Exploring how dietary intake of folate and metabolically related vitamins changes with age: a systematic review Print | PDF PROSPERO This information has been provided by the named contact for this review. CRD has accepted this information in good faith and registered the review in PROSPERO. CRD bears no responsibility or liability for the content of this registration record, any associated files or external websites. Email salutation (e.g. "Dr Smith" or "Joanne") for correspondence (...) of administration, frequency of administration, route of administration, vehicle. ">Data to be extracted: intervention of interest Example: Serum creatinine; continuous; umol/L (may be recalculated from mg/dL). ">Data to be extracted: primary outcome(s) Example: Blood urea nitrogen; continuous; mmol/L (may be recalculated from mg/dL); Renal histological damage as assessed by Jablonski scale; continuous; Jablonski score. ">Data to be extracted: secondary outcome(s) Example: 1st author, year of publication

2018 PROSPERO

247. Genetic Variation in Renal Expression of Folate Receptor 1 (Folr1) Gene Predisposes Spontaneously Hypertensive Rats to Metabolic Syndrome. (PubMed)

. Results in the SHR.BN-chr.1 congenic strain confirmed that the SHR variant in Folr1 cosegregates with markedly reduced renal expression of Folr1 and renal folate reabsorption, decreased serum levels of folate, increased serum levels of cysteine and homocysteine, increased adiposity, ectopic fat accumulation in liver and muscle, reduced muscle insulin sensitivity, and increased blood pressure. Transgenic rescue experiments performed by expressing a Folr1 transgene in the SHR ameliorated most (...) Genetic Variation in Renal Expression of Folate Receptor 1 (Folr1) Gene Predisposes Spontaneously Hypertensive Rats to Metabolic Syndrome. Metabolism of homocysteine and other sulfur amino acids is closely associated with metabolism of folates. In this study, we analyzed the possible role of folates and sulfur amino acids in the development of features of the metabolic syndrome in the BXH/HXB recombinant inbred strains derived from the spontaneously hypertensive rat (SHR) and Brown Norway

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2015 Hypertension

248. The Dihydrofolate Reductase 19 bp Polymorphism Is Not Associated with Biomarkers of Folate Status in Healthy Young Adults, Irrespective of Folic Acid Intake. (PubMed)

intake questionnaire. Concentrations of serum folate and vitamin B-12, red blood cell (RBC) folate, and plasma total homocysteine (tHcy) were measured. Data were analyzed with the use of linear regression models.Folic acid intake was positively associated with serum (P < 0.0001) and RBC (P = 0.0005) folate concentration and was inversely associated with plasma tHcy (P = 0.001) as expected. The DHFR 19 bp polymorphism was not significantly associated with either serum (P = 0.82) or RBC (P = 0.21 (...) The Dihydrofolate Reductase 19 bp Polymorphism Is Not Associated with Biomarkers of Folate Status in Healthy Young Adults, Irrespective of Folic Acid Intake. Dihydrofolate reductase (DHFR) is essential for the conversion of folic acid to active folate needed for one-carbon metabolism. Common genetic variation within DHFR is restricted to the noncoding regions, and previous studies have focused on a 19 bp deletion/insertion polymorphism (rs70991108) within intron 1. Reports of an association

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2015 Journal of Nutrition

249. High concentrations of folate and unmetabolized folic acid in a cohort of pregnant Canadian women and umbilical cord blood. (PubMed)

pregnancy and at delivery, respectively. The mean (95% CI) cord RBC folate concentration was 2689 nmol/L (2614, 2765 nmol/L). UMFA was detectable in >90% of maternal and cord plasma samples. Although 3 fetal MTHFR and DHFR genetic variants had no effect, the fetal MTHFR 677TT genotype was associated with significantly lower cord serum (P = 0.03) and higher cord RBC (P = 0.02) folate concentrations than those of the wild type.Notwithstanding differences in assays, maternal and cord RBC folate and plasma (...) High concentrations of folate and unmetabolized folic acid in a cohort of pregnant Canadian women and umbilical cord blood. Mandatory fortification, prevalent supplement use, and public health guidelines recommending periconceptional supplementation have increased folic acid intakes in North American pregnant women. However, the effects of increased folic acid intakes during pregnancy on maternal and cord blood folate concentrations have not been well established.In this prospective study, we

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2015 American Journal of Clinical Nutrition

250. Biomarkers of Nutrition for Development-Folate Review. (PubMed)

is organized to provide the reader with a full appreciation of folate's history as a public health issue, its biology, and an overview of available biomarkers (serum folate, RBC folate, and plasma homocysteine concentrations) and their interpretation across a range of clinical and population-based uses. The article also includes a list of priority research needs for advancing the area of folate biomarkers related to nutritional health status and development. © 2015 American Society for Nutrition. (...) Biomarkers of Nutrition for Development-Folate Review. The Biomarkers of Nutrition for Development (BOND) project is designed to provide evidence-based advice to anyone with an interest in the role of nutrition in health. Specifically, the BOND program provides state-of-the-art information and service with regard to selection, use, and interpretation of biomarkers of nutrient exposure, status, function, and effect. To accomplish this objective, expert panels are recruited to evaluate

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2015 Journal of Nutrition

251. The impact of MTHFR 677 C/T genotypes on folate status markers: a meta-analysis of folic acid intervention studies. (PubMed)

was to assess the influence of MTHFR genotype on folate status followed by response to supplementation.We performed a meta-analysis of ten folate intervention studies to assess the degree to which MTHFR C677T genotype influenced plasma homocysteine and serum folate levels as measures of folate status. We then examined response after supplementation at intake values up to the upper tolerable limit.The MTHFR 677TT genotype was associated with higher plasma homocysteine (2.7 μmol/L, TT vs. CT/CC; 2.8 μmol/L (...) , TT vs. CC) and lower serum folate (2.5 nmol/L, TT vs. CT/CC; 3.6 nmol/L, TT vs. CC). In two studies, the TT groups had mean plasma Hcy >15 μmol/L. Serum folate levels were >7 nmol/L for all genotype groups. After supplementation of 400 up to 1670 μg DFEs of folic acid or folic acid + fortified foods and/or natural food folates for a minimum of 4 weeks, there were no significant differences in plasma homocysteine levels; however, individuals with the TT genotype had a lower serum folate response

2015 European journal of nutrition

252. Combined effect of folate and adiposity on homocysteine in children at three years of age (PubMed)

levels at 3 years of age.From the ongoing birth cohort at Ewha Womans University Mok-Dong Hospital, we compared adiposity parameters, serum homocysteine, and folate levels in 238 children (118 boys and 120 girls) at three years of age. The relationship between birth outcome, current weight and body mass index (BMI), postnatal growth, and homocysteine level were assessed using correlation and general linear model. Additionally, we assessed the combined effect between blood folate status and adiposity (...) Combined effect of folate and adiposity on homocysteine in children at three years of age Cardiovascular diseases is a major cause of death and is responsible for 23.8% of deaths in Korea. Clinical symptoms manifest in adulthood, but susceptibility begins in utero. Elevated homocysteine levels and adiposity might be linked to a greater risk in children as well as adults. We hypothesized that those who have simultaneous risk for folate and adiposity would be affected with elevated homocysteine

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2015 Nutrition research and practice

253. Iron, folate and vitamin B12 status of Ethiopian professional runners (PubMed)

) and moderate folate deficiency (<5.9 ng/mL) was 3, 2 and 20.8 % respectively. There was no iron deficiency anemia case in the study. In this study, the mean serum vitamin B12 concentration was 561 ± 231 pg/ml with a minimum and maximum value of 210 and 1736 pg/ml respectively, and there was no deficiency for this nutrient (>210 pg/ml). The iron status of male athletes was significantly different by running-distance categories. In contrast, such difference was absent for female athletes. Performance (...) Iron, folate and vitamin B12 status of Ethiopian professional runners Better macro and micro nutrient status and their adequate intake by the athletes have great role in balancing losses associated with strenuous exercise, then for better performance. The objective of this study was to determine iron, folate and vitamin B12 status of Ethiopian professional athletes.A cross sectional study was conducted using a point time convenient sample of 101 male and female Ethiopian professional athletes

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2015 Nutrition & metabolism

254. Vitamin B12 and folate levels in healthy Swiss senior citizens: a prospective study evaluating reference intervals and decision limits (PubMed)

B12, holotranscobalamin (holoTC), methylmalonic acid (MMA), homocysteine (Hcy), serum folate, red blood cell (RBC) folate were measured. Further, Fedosov's wellness score was determined. Associations of age, gender, and cystatin C/creatinine-based estimated kidney function, with the investigated parameters were assessed. Reference intervals were calculated. Further, ROC analysis was done to assess accuracy of the individual parameters in recognizing a deficient vitamin B12 status. Finally (...) . In a linear regression model Fedosov's wellness score was independently associated with kidney function (p < 0.001) but not with age. Total serum folate and red blood cell (RBC) folate drift apart with increasing age: whereas the former decreases (p = 0.01) RBC folate remains in the same bandwidth across all age groups (p = 0.12) A common reference interval combining age and gender strata can be obtained for vitamin B12 and holoTC, whereas a more differentiated approach seems warranted for serum folate

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2015 BMC geriatrics

255. Impact of voluntary fortification and supplement use on dietary intakes and biomarker status of folate and vitamin B-12 in Irish adults. (PubMed)

in supplement users. Supplement use but not fortification was associated with significantly higher serum vitamin B-12 concentrations relative to nonconsumers (P < 0.001). Two-thirds of young women had suboptimal RBC folate for protection against neural tube defects (NTDs); among nonconsumers of folic acid, only 16% attained optimal RBC folate.The consumption of voluntarily fortified foods and/or supplement use was associated with significantly higher dietary intakes and biomarker status of folate in Irish (...) Impact of voluntary fortification and supplement use on dietary intakes and biomarker status of folate and vitamin B-12 in Irish adults. Ireland has traditionally operated a liberal policy of voluntary fortification, but little is known about how this practice, along with supplement use, affects population intakes and status of folate and vitamin B-12.The aim was to examine the relative impact of voluntary fortification and supplement use on dietary intakes and biomarker status of folate

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2015 American Journal of Clinical Nutrition

256. Genetic modifiers of folate, vitamin B-12, and homocysteine status in a cross-sectional study of the Canadian population. (PubMed)

vitamin-related chronic diseases and biomarkers of nutrient status in a population exposed to folic acid fortification.A panel of 116 SNPs was sequenced by using the Sequenom iPLEX Gold platform in a sample of 3114 adults aged 20-79 y from the Canadian Health Measures Survey, cycle 1. Associations between these SNPs and red blood cell (RBC) folate, serum vitamin B-12, and plasma total homocysteine were determined.Twenty-one SNPs and 6 haplotype blocks were associated with RBC folate, serum vitamin B (...) Genetic modifiers of folate, vitamin B-12, and homocysteine status in a cross-sectional study of the Canadian population. Genetic variation can cause variable responses to environmental stimuli. A number of single-nucleotide polymorphisms (SNPs) have been associated with B vitamin status or chronic diseases related to vitamin B-12 and folate metabolism.Our objective was to identify associations between common SNPs in genes related to folate and vitamin B-12 metabolism or associated with B

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2015 American Journal of Clinical Nutrition

257. Folate, Vitamin B12 and Homocysteine status in the post-folic acid fortification era in different subgroups of the Brazilian population attended to at a public health care center (PubMed)

higher in the elderly (33.6%). Pregnant women carrying the MTHFR 677TT genotype showed lower serum folate levels (p = 0.042) and higher Hcy levels (p = 0.003). RFC1 A80G and GCPII C1561T polymorphisms did not affect folate and Hcy levels in the study group. After a multivariate analysis, Hcy levels were predicted by variables such as folate, vitamin B12, gender, age and RFC1 A80G polymorphism, according to the groups studied.Our results suggest that folate deficiency is practically nonexistent (...) Folate, Vitamin B12 and Homocysteine status in the post-folic acid fortification era in different subgroups of the Brazilian population attended to at a public health care center Folate and vitamin B12 are essential nutrients, whose deficiencies are considerable public health problems worldwide, affecting all age groups. Low levels of these vitamins have been associated with high concentrations of homocysteine (Hcy) and can lead to health complications. Several genetic polymorphisms affect

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2015 Nutrition journal

258. Elevated homocysteine level and folate deficiency associated with increased overall risk of carcinogenesis: meta-analysis of 83 case-control studies involving 35,758 individuals. (PubMed)

Elevated homocysteine level and folate deficiency associated with increased overall risk of carcinogenesis: meta-analysis of 83 case-control studies involving 35,758 individuals. Results of the association of folate metabolism and carcinogenesis are conflicting. We performed a meta-analysis to examine the effect of the interaction of serum concentration of homocysteine (Hcy), folate, and vitamin B12 and 5,10-methylenetetrahydrofolate reductase (MTHFR) polymorphism on risk of cancer overall.Two (...) was inversely associated with only urinary-system and gastrointestinal carcinomas and for Asian and Middle Eastern patients. As well, MTHFR C677T, A1298C and G1793A polymorphisms were related to elevated serum level of Hcy, and folate and vitamin B12 deficiency. However, only MTHFR C677T homogeneity/wild-type (TT/CC) polymorphism was positively associated with overall risk of cancer.Elevated serum Hcy level and folate deficiency are associated with increased overall risk of cancer.

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2015 PloS one

259. Plasma Homocysteine, Serum Folic Acid, Serum Vitamin B12, Serum Vitamin B6, MTHFR, and Risk of Normal-Tension Glaucoma. (PubMed)

, B vitamins' mean difference, and odds ratios of MTHFR C677T genotype between cases and controls.A total of 7 studies including 458 cases and 555 controls meeting the inclusion criteria were involved in this meta-analysis. There were 4 studies for tHcy (149 cases and 148 controls), 2 studies for vitamin B6, vitamin B12, and folate (90 cases and 82 controls), and 4 studies for MTHFR (343 cases and 449 controls). Overall, the mean plasma tHcy levels, serum folic acids, vitamin B12, and vitamin B6 (...) Plasma Homocysteine, Serum Folic Acid, Serum Vitamin B12, Serum Vitamin B6, MTHFR, and Risk of Normal-Tension Glaucoma. This meta-analysis aims to comprehensively evaluate the association between total homocysteine (tHcy) levels, serum folic acid, vitamin B12, vitamin B6 levels, methylenetetrahydrofolate reductase (MTHFR) C677T genotype, and risk of normal-tension glaucoma (NTG).A systematic search of the EMBASE and PubMed databases was performed to evaluate plasma tHcy levels, serum folic acid

2015 Journal of Glaucoma

260. Effect of folate supplementation on folate status and health outcomes in infants, children and adolescents: a systematic review.

included 26 studies. We conclude that both serum and erythrocyte folate values reflect folate intake; however, serum folate reacts more rapidly to folate intake than erythrocyte folate. As to health outcomes, we found no evidence indicating that additional intake of folate can influence haematological parameters in non-anaemic paediatric patients. We were unable to find evidence of a favourable effect of folate supplementation on the growth of infants. However, the limited data available suggest (...) that supplementing the diet of low-birth-weight infants with folic acid may moderate the rapid fall of serum and red cell folate in the first months of life.

2012 International journal of food sciences and nutrition

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