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Folate absence

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https://www.readbyqxmd.com/read/28241813/anaemia-in-hospitalised-preschool-children-from-a-rural-area-in-mozambique-a-case-control-study-in-search-for-aetiological-agents
#1
Cinta Moraleda, Ruth Aguilar, Llorenç Quintó, Tacilta Nhampossa, Montserrat Renom, Augusto Nhabomba, Sozinho Acácio, John J Aponte, Delino Nhalungo, Ariel H Achtman, Louis Schofield, Helder Martins, Eusebio Macete, Pedro L Alonso, Clara Menéndez
BACKGROUND: Young children bear the world's highest prevalence of anaemia, the majority of which is of multifactorial aetiology, which in turn hampers its successful prevention. Even moderate degrees of anaemia are associated with increased mortality and morbidity. Despite this evidence, there is a lack of effective preventive programs and absence of consensus in the safety of iron supplementation in malaria areas, which reflects the poor understanding of the contribution of different aetiologies to anaemia...
February 28, 2017: BMC Pediatrics
https://www.readbyqxmd.com/read/28178022/the-impact-of-essential-fatty-acid-b-vitamins-vitamin-c-magnesium-and-zinc-supplementation-on-stress-levels-in-women-a-systematic-review
#2
Delia McCabe, Karolina Lisy, Craig Lockwood, Marc Colbeck
BACKGROUND: Women juggling multiple roles in our complex society are increasingly experiencing psychological stress. Dietary supplementation to manage stress is widespread despite limited supporting evidence. A systematic review of the available literature was undertaken to investigate the efficacy of specific dietary supplements in managing female stress and anxiety. OBJECTIVES: To identify the impact of essential fatty acids (EFAs), B vitamins, vitamin C, magnesium and/or zinc, consumed as dietary supplements to the daily diet, on female stress and anxiety levels...
February 2017: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/28122733/impact-of-post-translational-modifications-of-engineered-cysteines-on-the-substituted-cysteine-accessibility-method-evidence-for-glutathionylation
#3
Rongbao Zhao, Mitra Najmi, Srinivas Aluri, I David Goldman
The substituted cysteine accessibility method (SCAM) is widely used to study the structure and function of channels, receptors and transporters. In its usual application, a cysteine residue is introduced into a protein which lacks native cysteines following which the accessibility of the residue to the aqueous compartment is assessed. Implicit, and generally assumed, is that if the cysteine-substituted residue is not available to react with sulfhydryl reagents it is not exposed to the extracellular compartment or within the aqueous translocation pathway...
January 25, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28017143/a-hr-ms-based-method-for-the-determination-of-chorismate-synthase-activity
#4
Harvinder Kour Khera, Susheel Kumar Singh, Rafia Mir, Vikram Bhardwaj, Subhash Singh
Chorismate synthase (Cs) catalyzes the last step of Shikimate pathway involving a unique biochemical reaction of anti-1,4 elimination of 3-phosphate group and the C-(6proR) hydrogen from 5-enolpyruvylshikimate-3-phosphate (EPSP) leading to the formation of chorismate, which is the common precursor for aromatic amino acid, ubiquinone, and folate biosynthesis in plants and several bacterial, fungal, and parasitic pathogens. Absence of Shikimate pathway in the vertebrate host, make Cs an appealing target for drug discovery against these pathogens...
December 22, 2016: Protein and Peptide Letters
https://www.readbyqxmd.com/read/27942180/imerslund-grasbeck-syndrome-in-a-5-year-old-iranian-boy
#5
K Goudarzipour, N Zavvar, B Behnam, M A Ahmadi
Imerslund-Grasbeck syndrome (IGS) is a rare syndrome characterized by clinical symptoms and signs of Vitamin B12 deficiency and proteinuria. Our patient was a 5-year-old boy with pallor, lack of appetite, and low weight gain. Laboratory studies showed severe macrocytic anemia, normal reticulocyte count, negative direct coombs test, normal osmotic fragility, and autohemolysis test. He has had intermittent proteinuria since 3 years ago despite normal creatinine level and absence of hematuria or hypertension. Finally, based on low level of serum B12 vitamin and normal folate level accompanied by asymptomatic proteinuria, the diagnosis of IGS was made...
November 2016: Indian Journal of Nephrology
https://www.readbyqxmd.com/read/27902365/oral-cavities-of-healthy-infants-harbour-high-proportions-of-streptococcus-salivarius-strains-with-phenotypic-and-genotypic-resistance-to-multiple-classes-of-antibiotics
#6
Thaís H Palma, Erika N Harth-Chú, Jodie Scott, Rafael N Stipp, Heike Boisvert, Mariana F Salomão, Jéssica D Theobaldo, Rosana F Possobon, Leandro C Nascimento, Jonathan W McCafferty, Lina Faller, Margaret J Duncan, Renata O Mattos-Graner
Emerging antibiotic resistance in the oropharyngeal microbiota, of which Streptococcus salivarius is a prominent species, represents a challenge for treating paediatric populations. In this study, we investigated the role of Streptococcussalivarius as a reservoir for antibiotic resistance genes (ARG) in the oral microbiota by analysing 95 Streptococcussalivarius isolates from 22 healthy infants (2-16 months of age). MICs of penicillin G, amoxicillin, erythromycin, tetracycline, doxycycline and streptomycin were determined...
December 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27747873/antioxidants-from-black-and-green-tea-from-dietary-modulation-of-oxidative-stress-to-pharmacological-mechanisms
#7
REVIEW
Ilaria Peluso, Mauro Serafini
The consumption of tea (Camellia sinensis) has been correlated with a low incidence of chronic pathologies, such as cardiovascular disease and cancer, in which oxidative stress plays a critical role. Tea catechins and theaflavins are, respectively, the bioactive phytochemicals responsible for the antioxidant activity of green tea (GT) and black tea (BT). In addition to their redox properties, tea catechins and theaflavins could have also pharmacological activities, such as the ability to lower glucose, lipid and uric acid (UA) levels...
October 16, 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27699007/effects-of-antiepileptic-drugs-on-the-serum-folate-and-vitamin-b12-in-various-epileptic-patients
#8
Hong-Li Huang, Hao Zhou, Nuan Wang, Chun-Yu Yu
Epilepsy is a common neurodegenerative disease with an increasing morbidity. Clinical treatment of epilepsy includes symptomatic treatment, etiological treatment, surgery and prevention. The aim of the present study was to determine the effects of antiepileptic drugs (AEDs) on serum folate and vitamin B12 in various epileptic patients, and to examine the correlation between these effects and secondary cerebrovascular events. A total of 68 epileptic patients, diagnosed between May 2012 and May 2014, were included in the present study...
October 2016: Biomedical Reports
https://www.readbyqxmd.com/read/27695536/high-incidence-of-neural-tube-defects-in-northern-part-of-india
#9
Sunil Kumar Rai, Royana Singh, Sharad Pandey, Kulwant Singh, Neeraj Shinde, Sangita Rai, Rajniti Prasad, Satya Narayan Shama
BACKGROUND: In the absence of primary care and prevailing associated social stigma, many patients of neural tube defects (NTDs) from remote areas die without getting any treatment. The high number of such untreated cases and unregistered deaths in these areas made us ponders to the fact that tertiary care center-based studies do not represent the true incidence of NTDs. MATERIALS AND METHODS: We did a population-based survey for NTDs births of rural areas from Jaunpur to Ghazipur district in Eastern Uttar Pradesh...
October 2016: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/27442079/immobilization-free-electrochemical-biosensor-for-folate-receptor-in-cancer-cells-based-on-terminal-protection
#10
Jiancong Ni, Qingxiang Wang, Weiqiang Yang, Mengmeng Zhao, Ying Zhang, Longhua Guo, Bin Qiu, Zhenyu Lin, Huang-Hao Yang
The determination of folate receptor (FR) that over expressed in vast quantity of cancerous cells frequently is significant for the clinical diagnosis and treatment of cancers. Many DNA-based electrochemical biosensors have been developed for FR detection with high selectivity and sensitivity, but most of them need complicated immobilization of DNA on the electrode surface firstly, which is tedious and therefore results in the poor reproducibility. In this study, a simple, sensitive, and selective electrochemical FR biosensor in cancer cells has been proposed, which combines the advantages of the convenient immobilization-free homogeneous indium tin oxide (ITO)-based electrochemical detection strategy and the high selectivity of the terminal protection of small molecule linked DNA...
December 15, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27431289/elevated-homocysteine-with-pseudo-homozygosity-for-mthfr677t-as-predisposing-factors-for-transient-ischemic-attacks-a-case-report
#11
A Sobczyńska-Malefora, J Cutler, Y Rahman
A 21 year old male presented with a history of intermittent, transient neurological events. A brain MRI showed an area of restricted diffusion in keeping with an infarct, and an angiogram demonstrated an intracranial stenosis in the internal carotid artery, consistent with atherosclerosis. Laboratory investigations revealed a highly elevated plasma homocysteine, with low plasma folate and 5-methyltetrahydrofolate and methionine at the lower end of the normal ranges. The homocysteine normalized following treatment with folic acid...
October 2016: Metabolic Brain Disease
https://www.readbyqxmd.com/read/27423480/pterin-sulfa-conjugates-as-dihydropteroate-synthase-inhibitors-and-antibacterial-agents
#12
Ying Zhao, William R Shadrick, Miranda J Wallace, Yinan Wu, Elizabeth C Griffith, Jianjun Qi, Mi-Kyung Yun, Stephen W White, Richard E Lee
The sulfonamide class of antibiotics has been in continuous use for over 70years. They are thought to act by directly inhibiting dihydropteroate synthase (DHPS), and also acting as prodrugs that sequester pterin pools by forming dead end pterin-sulfonamide conjugates. In this study, eight pterin-sulfonamide conjugates were synthesized using a novel synthetic strategy and their biochemical and microbiological properties were investigated. The conjugates were shown to competitively inhibit DHPS, and inhibition was enhanced by the presence of pyrophosphate that is crucial to catalysis and is known to promote an ordering of the DHPS active site...
August 15, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27376192/a-one-pot-strategy-for-the-detection-of-proteins-based-on-sterically-and-allosterically-tunable-hybridization-chain-reaction
#13
Fangfang Ban, Hai Shi, Chang Feng, Xiaoxia Mao, Yongmei Yin, Xiaoli Zhu
In this work, we report a facile one-pot strategy for protein detection based on sterically and allosterically tunable hybridization chain reaction (HCR). In our strategy, DNA hairpins H1 and H2 are dual-labeled with pyrene moieties through a six-carbon-atom spacer at each end; and a single-stranded DNA primer is designed to contain two small molecules near each end. In the absence of target protein, the primer can trigger HCR events between alternating H1 and H2 hairpins to form a nicked double-helix. As a result, the pyrene excimers are formed to emit at approximately 485nm...
December 15, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/27267668/one-carbon-metabolism-in-pregnancy-impact-on-maternal-fetal-and-neonatal-health
#14
Satish C Kalhan
One carbon metabolism or methyl transfer, a crucial component of metabolism in all cells and tissues, supports the critical function of synthesis of purines, thymidylate and methylation via multiple methyl transferases driven by the ubiquitous methyl donor s-adenosylmethionine. Serine is the primary methyl donor to the one carbon pool. Intracellular folates and methionine metabolism are the critical components of one carbon transfer. Methionine metabolism requires vitamin B12, B6 as cofactors and is modulated by endocrine signals and is responsive to nutrient intake...
November 5, 2016: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/27228202/high-rate-of-thiamine-deficiency-among-inpatients-with-cancer-referred-for-psychiatric-consultation-results-of-a-single-site-prevalence-study
#15
Elie Isenberg-Grzeda, Megan Johnson Shen, Yesne Alici, Jonathan Wills, Christian Nelson, William Breitbart
OBJECTIVE: Thiamine deficiency (TD) is increasingly recognized in medically ill patients. The prevalence of TD among cancer patients is unknown. This study aims to characterize the prevalence of TD among inpatients with cancer. METHODS: Retrospective chart review of patients admitted to a large cancer center who were referred for psychiatric consultation and whose serum thiamine concentration was measured. Patients with alcohol use were excluded. RESULTS: Among 217 patients with various cancer types, TD was found in 55...
May 26, 2016: Psycho-oncology
https://www.readbyqxmd.com/read/27075913/folic-acid-supplementation-in-postpolypectomy-patients-in-a-randomized-controlled-trial-increases-tissue-folate-concentrations-and-reduces-aberrant-dna-biomarkers-in-colonic-tissues-adjacent-to-the-former-polyp-site
#16
Sharleen L O'Reilly, Angela P McGlynn, Helene McNulty, John Reynolds, Gillian R Wasson, Anne M Molloy, J J Strain, Donald G Weir, Mary Ward, George McKerr, John M Scott, C Stephen Downes
BACKGROUND: Low folate status is associated with an increased risk of colorectal carcinogenesis. Optimal folate status may be genoprotective by preventing uracil misincorporation into DNA and DNA hypomethylation. Adenomatous polyps have low folate status compared with normal colonic mucosa, and they are surrounded by histologically normal mucosa that also is of low folate status. OBJECTIVE: In a randomized controlled trial conducted at a single Dublin hospital between April 2002 and March 2004, we assessed the effect of folic acid supplementation on tissue folate, uracil misincorporation into DNA, and global DNA hypomethylation in colonocytes isolated from sites of adenomatous polyps and from histologically normal tissue adjacent and 10-15 cm distal to them...
May 2016: Journal of Nutrition
https://www.readbyqxmd.com/read/27054811/synthesis-and-preclinical-evaluation-of-folate-nota-al-18-f-for-pet-imaging-of-folate-receptor-positive-tumors
#17
Qingshou Chen, Xiangjun Meng, Paul McQuade, Daniel Rubins, Shu-An Lin, Zhizhen Zeng, Hyking Haley, Patricia Miller, Dinko González Trotter, Philip S Low
UNLABELLED: Folate-receptor-targeted PET radiotracers can potentially serve as versatile imaging agents for the diagnosis, staging, and prediction of response to therapy of patients with folate-receptor (FR)-expressing cancers. Because current FR-targeted PET reagents can be compromised by complex labeling procedures, low specific activities, poor radiochemical yields, or unwanted accumulation in FR negative tissues, we have undertaken to design an improved folate-PET agent that might be more amenable for clinical development...
May 2, 2016: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/27047750/experimentally-optimized-threading-structures-of-the-proton-coupled-folate-transporter
#18
Swapneeta S Date, Cheng-Yen Charles Chen, Yidong Chen, Michaela Jansen
The proton-coupled folate transporter (PCFT, SLC46A1) transports folic acid across the plasma membrane, together with an excess of protons such that the net charge translocation is positive. We developed 3D structural models of PCFT threaded onto the X-ray structures of major facilitator superfamily (MFS) members that were identified as close structural homologues. The model of PCFT threaded onto the glycerol-3-phosphate transporter (GlpT) structure is consistent with detailed accessibility studies in the absence of extracellular substrate and at pH 7...
March 2016: FEBS Open Bio
https://www.readbyqxmd.com/read/27035691/folate-conjugated-immunoglobulin-targets-melanoma-tumor-cells-for-nk-cell-effector-functions
#19
Cassandra C Skinner, Elizabeth L McMichael, Alena C Jaime-Ramirez, Zachary B Abrams, Robert J Lee, William E Carson
The folate receptor (FR) is overexpressed on the vascular side of cancerous cells including those of the breast, ovaries, testes, and cervix. We hypothesized that a folate-conjugated immunoglobulin (F-IgG) would bind to the FR that is overexpressed on melanoma tumor cells to target these cells for lysis by natural killer (NK) cells. Folate receptor expression was confirmed in the Mel-39 (human melanoma) cell line by flow cytometry and immunoblot analysis using KB (human oral epithelial) and F01 (human melanoma) as a positive and a negative control, respectively...
August 2016: Melanoma Research
https://www.readbyqxmd.com/read/26912492/vitamin-b-12-concentration-memory-performance-and-hippocampal-structure-in-patients-with-mild-cognitive-impairment
#20
RANDOMIZED CONTROLLED TRIAL
Theresa Köbe, A Veronica Witte, Ariane Schnelle, Ulrike Grittner, Valentina A Tesky, Johannes Pantel, Jan Philipp Schuchardt, Andreas Hahn, Jens Bohlken, Dan Rujescu, Agnes Flöel
BACKGROUND: Low-normal concentrations of vitamin B-12 (VitB12) may be associated with worse cognition. However, previous evidence has been mixed, and the underlying mechanisms remain unclear. OBJECTIVE: We determined whether serum VitB12 concentrations within the normal range were linked to memory functions and related neuronal structures in patients with mild cognitive impairment (MCI). DESIGN: In a cross-sectional design, we assessed 100 amnestic MCI patients (52 women; age range: 50-80 y) with low- and high-normal VitB12 concentration (median split: 304 pmol/L) for memory functions with the use of the Auditory Verbal Learning Test...
April 2016: American Journal of Clinical Nutrition
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