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Vitamin b12

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https://www.readbyqxmd.com/read/28749117/roux-en-y-gastric-bypass-versus-sleeve-gastrectomy-a-narrative-review-of-risks-and-benefits
#1
Matthew D Ettleson, Corey J Lager, Andrew T Kraftson, Nazanene H Esfandiari, Elif A Oral
INTRODUCTION: Roux-en-Y gastric bypass (GB) and sleeve gastrectomy (SG) are the most commonly performed metabolic surgeries and are highly effective for the treatment of obesity and related comorbidities. In this narrative review, recent studies of at least two years of follow-up directly comparing outcomes between GB and SG are reviewed to assess the efficacy of each procedure in weight loss and diabetes remission, as well as resulting quality of life (QoL) assessment and micronutrient deficiencies...
July 26, 2017: Minerva Chirurgica
https://www.readbyqxmd.com/read/28748002/high-levels-of-circulating-folate-concentrations-are-associated-with-dna-methylation-of-tumor-suppressor-and-repair-genes-p16-mlh1-and-mgmt-in-elderly-chileans
#2
Hugo Sanchez, Mohammad B Hossain, Lydia Lera, Sandra Hirsch, Cecilia Albala, Ricardo Uauy, Karin Broberg, Ana M Ronco
BACKGROUND: Changes in DNA methylation, one of the most studied epigenetic mechanisms, are considered an initial marker for early cancer detection. We evaluated how availability of dietary factors (folates and vitamin B12) involved in one-carbon metabolism may contribute to DNA methylation changes of cancer-related genes in human subjects. METHODS: We studied, by pyrosequencing, the methylation of tumor suppressor gene p16, DNA repair genes MLH1 and MGMT, and the repetitive element LINE-1 (as a surrogate for global DNA methylation), in blood of elderly individuals (n = 249) who had been exposed to folic acid (FA) through FA-fortified wheat flour during the last 12 years...
2017: Clinical Epigenetics
https://www.readbyqxmd.com/read/28746916/a-missense-mutation-in-tcn2-is-associated-with-decreased-risk-for-congenital-heart-defects-and-may-increase-cellular-uptake-of-vitamin-b12-via-megalin
#3
Peiqiang Li, Lijuan Huang, Yufang Zheng, Xuedong Pan, Rui Peng, Yueming Jiang, Richard H Finnell, Haijie Li, Bin Qiao, Hong-Yan Wang
Deregulation of folate and vitamin B12 (VB12) metabolism contributes to the risk of congenital heart defects (CHDs). Transcobalamin (TCN2) is essential for transporting VB12 from blood to cells as TCN2-bound VB12 (holo-TC) is the only form for somatic cellular uptake. In this study, we performed an association study between common polymorphisms in 46 one carbon metabolism genes and CHD in 412 CHDs and 213 controls. Only two significant association signals in coding regions were identified: FTCD c.1470C>T & TCN2 c...
July 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/28745245/-bariatric-surgery-who-when-and-where-an-overview-for-the-referring-physician
#4
T C C Boerlage, Y I Z Acherman, S T Houweling, F Holleman, V E A Gerdes
- Bariatric surgery is performed in patients with a body mass index (BMI) > 40kg/m2, or BMI > 35 kg/m2 with obesity-related comorbidities. The Roux-en-Y gastric bypass and sleeve gastrectomy are the most frequently used procedures.- On average, patients have lost 25-27% of their original weight 10 years after surgery.- Obesity-related comorbidities improve dramatically in many patients following surgery. The effect is most noticeable in patients with diabetes mellitus type 2 and obstructive sleep apnoea syndrome...
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28742214/association-of-combined-gif290t-c-heterozygous-mutation-fut2-secretor-variant-with-neural-tube-defects
#5
R M Guéant-Rodriguez, C Chery, B-M Fofou-Caillierez, J Voirin, B Foliguet, T Josse, D Tramoy, F François, J-L Guéant
Folate and vitamin B12 are needed for the proper embryo-fetal development possibly through their interacting role in the one-carbon metabolism. Folate fortification reduces the prevalence of complex birth defects, and more specifically neural tube defects (NTD). GIF and FUT2 are two genes associated with the uptake and blood level of vitamin B12. We evaluated GIF and FUT2 as predictors of severe birth defects, in 181 aborted fetuses compared to 375 healthy newborns. The GIF290C allele frequency was estimated to 0...
July 25, 2017: Clinical Genetics
https://www.readbyqxmd.com/read/28738729/utility-of-a-laboratory-score-in-the-prediction-of-gastric-emptying-in-autoimmune-gastritis-patients
#6
Çağdaş Kalkan, Irfan Soykan
OBJECTIVES: Patients with autoimmune gastritis may have symptoms suggestive of delayed gastric emptying. The aim of this study was to explore the predictive value of two scoring systems in the differentiation of delayed gastric emptying in patients with autoimmune gastritis. METHODS: About 154 patients (106 women) with autoimmune gastritis whose gastric emptying test were available, were analyzed using two laboratory-based scoring systems: 'global score' (hemoglobin, mean corpuscular volume, gastrin, vitamin B12, and chromogranin A) and 'simple score' (hemoglobin, mean corpuscular volume, and gastrin) in order to discriminate delayed and normal gastric emptying...
July 24, 2017: Acta Clinica Belgica
https://www.readbyqxmd.com/read/28733112/distinctions-in-gene-specific-changes-in-dna-methylation-in-response-to-folic-acid-supplementation-between-women-with-normal-weight-and-obesity
#7
Hea Jin Park, Lynn B Bailey, Deanna C Shade, Dorothy B Hausman, Natalie M Hohos, Richard B Meagher, Gail Pa Kauwell, Richard D Lewis, Alicia K Smith
BACKGROUND/OBJECTIVES: Obesity and maternal folate deficiency are associated with increased risk for neural tube defects (NTDs). Limited knowledge exists on the impact of folate status or obesity on DNA methylation of genes related to NTD risk and folate metabolism. SUBJECTS/METHODS: Women (18-35y) with normal weight (NW; BMI 18.5-24.9kg/m(2); n=12) and obesity (OB; BMI >30kg/m(2); n=6) were provided FA (800μg/d) for 8-weeks. Serum folate concentration and changes in DNA methylation across 2098 CpG sites in 91 genes related to NTD risk and folate metabolism were examined...
July 18, 2017: Obesity Research & Clinical Practice
https://www.readbyqxmd.com/read/28731851/the-frequency-of-occurrence-of-fish-shaped-red-blood-cells-in-different-haematologic-disorders
#8
Christoph Robier, Carolin Körber, Franz Quehenberger, Manfred Neubauer, Albert Wölfler
BACKGROUND: Red blood cells (RBC) resembling the silhouette of a fish are rarely observed in peripheral blood (PB) smears. In this study, we determined the frequency of occurrence of fish-shaped RBC in different haematologic diseases. METHODS: We examined PB smears of patients with iron deficiency anaemia (IDA) (n=23), β-thalassaemia minor (BTM) (n=30), sickle cell disease (SCD) (n=7), autoimmune haemolytic anaemia (AIHA) (n=13), microangiopathic haemolytic anaemia (MAHA) (n=11), hereditary sphaerocytosis (HS) (n=4), hereditary elliptocytosis (HE) (n=3), vitamin B12 and folate deficiency (n=15), anaemia in liver disease (LD) (n=17), myelodysplastic syndrome (MDS) (n=15), acute myeloid leukaemia (AML) (n=29), chronic myeloid leukaemia (CML) (n=18), primary myelofibrosis (PMF) (n=12), chronic myelo-monocytic leukaemia (CMML) (n=15) and 21 healthy controls by light microscopy for the occurrence of fish-shaped erythrocytes...
July 21, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28728112/reductive-defluorination-of-perfluorooctanoic-acid-by-titanium-iii-citrate-with-vitamin-b12-and-copper-nanoparticles
#9
Yu-Chi Lee, Yi-Pei Chen, Meng-Jia Chen, Jeff Kuo, Shang-Lien Lo
Perfluorooctanoic acid (PFOA) is widespread in the environment, which causes serious health and safety concerns. A mechanistic study on reductive defluorination of PFOA by titanium(III) citrate in the presence of catalysts was conducted. Vitamin B12 was used to catalyze reduction reactions by shuttling electrons from a reducing agent (electron donor) to PFOA to produce a Co-carbon bond intermediates. In the presence of copper nanoparticles, a precursor complex, B12-C7F14COOH, adsorbed on the metal surface, followed by a hydrogenolytic reaction to form less-fluorinated products...
June 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28727446/reductive-outer-sphere-single-electron-transfer-is-an-exception-rather-than-the-rule-in-natural-and-engineered-chlorinated-ethene-dehalogenation
#10
Benjamin Heckel, Stefan Cretnik, Sarah Kliegman, Orfan Shouakar-Stash, Kristopher McNeill, Martin Elsner
Chlorinated ethenes (CEs) such as perchloroethylene, trichloroethylene and dichloroethylene are notorious groundwater contaminants. Although reductive dehalogenation is key to their environmental and engineered degradation, underlying reaction mechanisms remain elusive. Outer-sphere reductive single electron transfer (OS-SET) has been proposed for such different processes as Vitamin B12-dependent biodegradation and zero-valent metal-mediated dehalogenation. Compound-specific isotope effect (13C/12C, 37Cl/35Cl) analysis offers a new opportunity to test these hypotheses...
July 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28726793/correction-vitamin-b12-deficiency
#11
Ralph Green, Lindsay H Allen, Anne-Lise Bjørke-Monsen, Alex Brito, Jean-Louis Guéant, Joshua W Miller, Anne M Molloy, Ebba Nexo, Sally Stabler, Ban-Hock Toh, Per Magne Ueland, Chittaranjan Yajnik
This corrects the article DOI: 10.1038/nrdp.2017.40.
July 20, 2017: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/28726436/is-it-intestinal-tuberculosis-again-case-report
#12
Kristián Brat, Zdeněk Merta, Ivan Čundrle
This case report focuses on an immigrant admitted to the Department of Respiratory Diseases, University Hospital Brno due to suspicion of relapsing intestinal tuberculosis. The patient presented with fever, night sweat, weight loss, diarrhea, and a history of several tuberculosis attacks in the last few years. None of the examinations confirmed the presence of active tuberculosis but raised suspicion of hematological malignancy. Pancytopenia was present in the peripheral blood. However, bone marrow examination and flowcytometry excluded the presence of a hematological malignancy...
2017: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/28726051/serum-methylmalonic-acid-correlates-with-neuropathic-pain-in-idiopathic-parkinson-s-disease
#13
Jin-Sung Park, Donghwi Park, Pan-Woo Ko, Kyunghun Kang, Ho-Won Lee
Recent studies have shown a relatively higher prevalence of peripheral neuropathy in idiopathic Parkinson's disease (IPD). The hypothesis is that prolonged levodopa exposure causes vitamin B12 deficiency, which leads to peripheral neuropathy. The aim of our study was to find the relationship between vitamin B12 and its precursor methylmalonic acid (MMA) in IPD patients with neuropathic pain. We performed a cross-sectional study by enrolling consecutive 43 patients who were clinically tested positive for F-18 FP-CIT PET and 15 patients were diagnosed with peripheral neuropathy according to the Toronto clinical scoring system (TCSS)...
July 19, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28723303/folate-serum-levels-in-italian-women-entering-an-in-vitro-fertilization-program
#14
Adalisa Ponzano, Gian Mario Tiboni
Italian public health authorities recommend women of childbearing age to assume a daily dose of 0.4 mg of folic acid (FA) from at least one month before conception in order to reduce the risk of having children affected by neural tube defects (NTDs). In this study, folate, homocysteine and vitamin B12 serum levels were determined in 77 women entering an in vitro fertilization program. About 75% of patients had serum folate values compatible with the intake of the recommended dose of FA for at least three months, whereas only the 61% of them reached or exceeded the serum folate concentration regarded as the optimal concentration during the periconceptional period...
July 19, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28721209/recent-advances-in-preventing-stroke-recurrence
#15
REVIEW
J David Spence
Recent advances in secondary stroke prevention include new evidence in hypertension, nutrition, anticoagulation, antiplatelet therapy, intracranial stenosis, percutaneous closure of patent foramen ovale, and lipid-lowering therapy. Individualized therapy for hypertension based on phenotyping with plasma renin and aldosterone markedly improves blood pressure control in patients with resistant hypertension. A Mediterranean diet can reduce the risk of stroke by nearly half. The diagnosis and treatment of metabolic vitamin B12 deficiency, and B vitamins to lower homocysteine, can reduce the risk of stroke by approximately 30%...
2017: F1000Research
https://www.readbyqxmd.com/read/28718824/associations-between-red-meat-intakes-and-the-micronutrient-intake-and-status-of-uk-females-a-secondary-analysis-of-the-uk-national-diet-and-nutrition-survey
#16
Emma Derbyshire
Blanket health messages to lower red meat intakes are being communicated at present. These could have adverse implications on the micronutrient quality of women's diets. The current paper evaluates the nutritional impact of lower red meat intakes on British women's micronutrient intakes and status. A secondary analysis of the UK National Diet and Nutrition Survey was undertaken using data from years 2008/2009 to 2011/2012. This was comprised of dietary and blood analyte data from 1384 and 641 females aged 11 to 64 years...
July 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28718091/nutritional-and-micronutrient-care-of-bariatric-surgery-patients-current-evidence-update
#17
REVIEW
Michael A Via, Jeffrey I Mechanick
PURPOSE OF REVIEW: The continued success of bariatric surgery to treat obesity and obesity-associated metabolic conditions creates a need for a strong understanding of clinical nutrition both before and after these procedures. RECENT FINDINGS: Surgically induced alteration of gastrointestinal physiology can affect the nutrition of individuals, especially among those who have undergone malabsorptive procedures. While uncommon, a subset of patients may develop protein-calorie malnutrition...
July 17, 2017: Current Obesity Reports
https://www.readbyqxmd.com/read/28715540/predictors-of-hand-foot-syndrome-and-pyridoxine-for-prevention-of-capecitabine-induced-hand-foot-syndrome-a-randomized-clinical-trial
#18
Yoon-Sim Yap, Li-Lian Kwok, Nicholas Syn, Wen Yee Chay, John Whay Kuang Chia, Chee Kian Tham, Nan Soon Wong, Soo Kien Lo, Rebecca Alexandra Dent, Sili Tan, Zuan Yu Mok, King Xin Koh, Han Chong Toh, Wen Hsin Koo, Marie Loh, Raymond Chee Hui Ng, Su Pin Choo, Richie Chuan Teck Soong
Importance: Hand-foot syndrome (HFS) is a common adverse effect of capecitabine treatment. Objective: To compare the incidence and time to onset of grade 2 or greater HFS in patients receiving pyridoxine vs placebo and to identify biomarkers predictive of HFS. Design, Setting, and Participants: This single-center, randomized double-blind, placebo-controlled phase 3 trial conducted at National Cancer Centre Singapore assessed whether oral pyridoxine could prevent the onset of grade 2 or higher HFS in 210 patients scheduled to receive single-agent capecitabine chemotherapy for breast, colorectal, and other cancers...
July 13, 2017: JAMA Oncology
https://www.readbyqxmd.com/read/28711333/b12-deficiency-leading-to-marked-poikilocytosis-versus-true-schistocytosis-a-pernicious-problem
#19
James A Hall, James Mason, Julia Choi, Mark Holguin
Severe vitamin B12 deficiency is caused most commonly by autoimmune atrophic gastritis leading to loss of intrinsic factor. Vitamin B12 deficiency leading to megaloblastic anemia and demyelinating central nervous system disease is well known; however, a rare presentation of B12 deficiency described as pseudothrombotic microangiopathy is not well known. This complication presents with signs of mechanical hemolysis, elevated lactate dehydrogenase (LDH), thrombocytopenia, and a low reticulocyte count, which can be incorrectly diagnosed as thrombotic thrombocytopenic purpura and managed incorrectly...
June 20, 2017: Transfusion and Apheresis Science
https://www.readbyqxmd.com/read/28710276/atp-binding-and-hydrolysis-disrupts-the-high-affinity-interaction-between-the-heme-abc-transporter-hmuuv-and-its-cognate-substrate-binding-protein
#20
Hiba Qasem Abdullah, Michal Perach, Nurit Livnat-Levanon, Oded Lewinson
Using the energy of ATP hydrolysis ABC transporters catalyze the trans-membrane transport of molecules. In bacteria they partner with a high affinity substrate binding protein (SBP) to import essential micronutrients. ATP binding by Type-I ABC transporters (importers of amino acids, sugars, peptides, small ions) stabilizes the interaction between the transporter and the SBP, thus allowing transfer of the substrate from the latter to the former. In Type-II ABC transporters (importers of trace elements, e.g., vitamin B12, heme, iron-siderophores) the role of ATP remains debatable...
July 14, 2017: Journal of Biological Chemistry
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