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Yang Wang, Qi Liu, Qin Zhang, Bosi Peng, Hexiang Deng
We report a new approach to create metal-binding site in a series of metal-organic frameworks (MOFs), where tetra-topic carboxylate linker, 4',4'',4''',4''''-methanetetrayltetrabiphenyl-4-carboxylic acid, is partially replaced by a tri-topic carbox-ylate linker, tris(4-carboxybiphenyl)amine, in combination with mono-topic linkers, formic acid, trifluoroacetic acid, ben-zoic acid, isonicotinic acid, 4-chlorobenzoic acid, and 4-nitrobenzoic acid, respectively. The distance between these paired-up linkers can be precisely controlled, ranging from 5...
April 18, 2018: Angewandte Chemie
Amina Tahar, Faiza Zerdoumi, Messaoud Saidani, Lakhdar Griene, Elhadj-Ahmed Koceir
The 1-25-hydroxyvitamine D (1-25OHD) or calcitriol deficiency in chronic kidney disease (CKD) patients was associated with increases vascular calcification risk, nephrons reduction, bone deficit and cardiovascular mortality by atherosclerosis. The objective of this study was to investigate the pleiotropic effects of 200.000 IU (D200 group) every 3 months versus 30.000 IU (D30 group) every month dose vitamin D supplementation in stage 3 CKD patients. A cohort of 132 adult subjects was randomized into 2 groups according to dose vitamin D supplementation in deficient subjects (25OHD <50 nmol/L or <20 ng/mL)...
April 16, 2018: Annales de Biologie Clinique
Levent Gungor, Murat Polat, Mehlika Berra Ozberk, Bahattin Avci, Ummet Abur
BACKGROUND: Stroke is still a major global health problem in both developed and developing countries. Defining stroke subtype and underlying etiologies is a major step to choose the best method for prophylaxis. Homocysteine is an endothelial toxin and elevated levels have been associated with stroke risk. In this study, we hypothesized that serum total homocysteine level may be related with specific atherothrombotic ischemic stroke subtypes and aimed to find if high serum homocysteine levels are correlated with any specific ischemic stroke subtype...
April 13, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Kalyani Mondal, Pratip Chakraborty, S N Kabir
Women with polycystic ovary syndrome (PCOS) are at increased risk of cardiovascular diseases (CVD); however, the independent role of PCOS in the incident CVD remains unknown. There are reports that hyperhomocysteinemia (HHcy), a potential cause of CVD, is frequently associated with PCOS. The present study investigates the independent attributes of hyperandrogenemia (HA), the integral associate of PCOS, and HHcy in causing atherogenic dyslipidemia. Twenty-five-day old rats were treated with homocysteine (Hcy) at 50 mg/kg/day dose level for 12 weeks...
April 13, 2018: Biochemical and Biophysical Research Communications
Karen E Christensen, Renata H Bahous, Wenyang Hou, Liyuan Deng, Olga V Malysheva, Erland Arning, Teodoro Bottiglieri, Marie A Caudill, Loydie A Jerome-Majewska, Rima Rozen
Background: Suboptimal folate intake, a risk factor for birth defects, is common even in areas with folate fortification. A polymorphism in methylenetetrahydrofolate dehydrogenase 1 (MTHFD1), R653Q (MTHFD1 c.1958 G > A), has also been associated with increased birth defect risk, likely through reduced purine synthesis. Objective: We aimed to determine if the interaction of MTHFD1 synthetase deficiency and low folate intake increases developmental abnormalities in a mouse model for MTHFD1 R653Q...
April 1, 2018: Journal of Nutrition
Jin Wang, Lijuan Xu, Hongmiao Xia, Ying Li, Shiqi Tang
Objective To investigate the association of the MTHFR C677T gene polymorphism with metabolic syndrome (MetS) in people in Hubei Province, China. Methods A case-control study was conducted with 651 subjects with MetS (MetS group) and 727 healthy controls (control group) at Renmin Hospital of Wuhan University between January and December 2016. The MTHFR C677T genotype was detected by the gene chip technique and clinical data were collected. Results Body mass index, waist circumference, the waist-hip-ratio, systolic and diastolic blood pressure, fasting blood glucose, fasting insulin, triglyceride, total cholesterol, low-density lipoprotein-cholesterol, and homocysteine levels, and the homeostasis model assessment of insulin resistance were higher in the MetS group than in controls...
January 1, 2018: Journal of International Medical Research
Xuchen Hu, Yuxia Wang, Li Gao, Wenxin Jiang, Wenzhen Lin, Chenguang Niu, Keyong Yuan, Rui Ma, Zhengwei Huang
The luxS gene is present in a wide range of bacteria and is involved in many cellular processes. LuxS mutation can cause autoinducer(AI)-2 deficiency and methyl metabolism disorder. The objective of this study was to demonstrate that, in addition to AI-2-mediated quorum sensing (QS), methyl metabolism plays an important role in LuxS regulation in Streptococcus mutans . The sahH gene from Pseudomonas aeruginosa was amplified and introduced into the S. mutans luxS -null strain to complement the methyl metabolism disruption in a defective QS phenotype...
2018: Frontiers in Microbiology
Ambreen Tariq, Mohammad A Mansoor, Hans-Peter Marti, Grete Jonsson, Audun Slettan, Pabasara Weeraman, Terje Apeland
BACKGROUND: Oxidative stress is evident from an early stage in chronic kidney disease (CKD). Therefore, we investigated redox biomarkers in polycystic kidney disease (ADPKD) and IgA nephropathy (IGAN). METHODS: This is a case-control study with three groups: ADPKD (n = 54), IGAN (n = 58) and healthy controls (n = 86). The major plasma aminothiols with their redox species were examined: homocysteine (Hcy), cysteinglycine (CG), cysteine (Cys) and glutathione (GSH)...
April 12, 2018: Clinical Biochemistry
Jianmin Zhu, Yanhui Gao, Dianjun Sun, Yudan Wei
Nutritional status could affect arsenic metabolism and toxicity in the general population chronically exposed to low levels of inorganic arsenic. In this study, we examined the association of serum folate and cobalamin with urinary concentrations of dimethylarsinic acid (DMA), the most abundant metabolite of inorganic arsenic measured in urine, in children and adults who participated in the 2003-2006 US National Health and Nutrition Examination Surveys. A total of 1161 children (aged 6-19 years) and 1938 adults (aged 20-85 years) were analyzed for the association using multivariate general linear models, adjusting for potential confounders...
April 12, 2018: Environmental Science and Pollution Research International
Der-Yen Lee, Wei-Chieh Huang, Ting-Jia Gu, Geen-Dong Chang
Hydrogen sulfide (H2 S), previously known as a toxic gas, is now recognized as a gasotransmitter along with nitric oxide and carbon monoxide. However, only few methods are available for quantitative determination of H2 S in biological samples. 2-Iodoacetanilide (2-IAN), a thiol-reacting agent, has been used to tag the reduced cysteine residues of proteins for quantitative proteomics and for detection of cysteine oxidation modification. In this article, we proposed a new method for quantitative analyses of H2 S and thiol metabolites using the procedure of pre-column 2-IAN derivatization coupled with liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS)...
April 5, 2018: Journal of Chromatography. A
Priyanka Dhar, Vijay K Sharma, Saroj K Das, Kalpana Barhwal, Sunil K Hota, Shashi B Singh
We studied the differential responses of autonomic function in sea level residents (SLR), acclimatized lowlanders (ALH) in high altitude (HA) and HA natives (HAN) at >3500 m. Out of 771 male volunteers included in this cross-sectional study, SLR, ALH and HAN groups were comprised of 351, 307 and 113 volunteers, respectively. Our results showed persistent sympathetic dominance with significantly reduced (p < 0.05) parasympathetic response in ALH as compared to SLR and HAN populations. This may be attributed to significantly increased (p < 0...
April 9, 2018: Respiratory Physiology & Neurobiology
Olga Schäfer, Matthias Barz
With regard to protein- or peptide chemistry, thiols are frequently chosen as a chemical entity for chemo-selective modification reactions. And while it is a well established methodology to address cysteines and homocysteines in aqueous media to form S-C bonds, possibilities for the chemoselective formation of asymmetric disulfide bonds are much less approached. Focusing on bioreversibility in conjugation chemistry, the formation of disulfide bonds is highly desirable for the attachment of thiol-bearing bioactive agents to proteins or in cross-linking reactions, since disulfide bonds can combine stability in blood with degradability inside cells...
April 12, 2018: Chemistry: a European Journal
Binghui Du, Huizi Tian, Dandan Tian, Chengda Zhang, Wenhua Wang, Lianke Wang, Mengying Ge, Quanliang Hou, Weidong Zhang
The aim of this study is to analyse the efficacy rate of folate for the treatment of hyperhomocysteinaemia (HHcy) and to explore how folate metabolism-related gene polymorphisms change its efficacy. This study also explored the effects of gene-gene and gene-environment interactions on the efficacy of folate. A prospective cohort study enrolling HHcy patients was performed. The subjects were treated with oral folate (5 mg/d) for 90 d. We analysed the efficacy rate of folate for the treatment of HHcy by measuring homocysteine (Hcy) levels after treatment...
April 2018: British Journal of Nutrition
Nina Rica Wium Geiker, Mette Veller, Louise Kjoelbaek, Jette Jakobsen, Christian Ritz, Anne Raben, Arne Astrup, Janne Kunchel Lorenzen, Lesli H Larsen, Susanne Bügel
Background: Obesity is associated with vitamin insufficiency and low grade inflammation. The purpose of this study was to investigate the effect of weight loss on folate, retinol, vitamin B12 , D and E status and the degree of inflammation. Methods: Out of 110, 85 individuals (75% women) aged 39 ± 11 years with a mean ± SD BMI of 33 ± 4 kg/m2 , completed an eight-week low energy diet (LED). Serum concentration of folate, retinol, B12 , D and E and C-reactive protein and homocysteine (Hcy) were measured at baseline and at end of the LED...
2018: Nutrition & Metabolism
Alexander V Ivanov, Ksenya A Nikiforova, Polina O Bulgakova, Edward D Virus, Aslan A Kubatiev
A sensitive capillary electrophoresis method was developed for the determination of aminothiol (cysteine, homocysteine, and glutathione) total levels in human blood plasma. Analytes were derivatized with Ellman's reagent (5,5'-dithiobis(2-nitrobenzoic acid)) after reduction with dithiothreitol. Liquid-liquid extraction was applied to purify the samples and concentrate the analytes. Total analysis time was 7.5 min using a silica capillary (50 μm i.d.; effective separation length 23.5 cm). Electrophoretic separation was performed using 50 mM citric acid with 20 mM triethanolamine (pH 3) containing 2% Ficoll 400...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Liang Ma, Meihua Yan, Xiaomu Kong, Yongwei Jiang, Tingting Zhao, Hailing Zhao, Qian Liu, Haojun Zhang, Peng Liu, Yongtong Cao, Ping Li
The aim of this study was to investigate the relationship between EPHX2 rs751141 (R287Q polymorphism) and diabetic nephropathy (DN) in Chinese type 2 diabetes (T2D). This case-control study explored the association between EPHX2 rs751141 and DN in a total of 870 Chinese T2D patients (406 T2D patients with DN and 464 T2D patients without DN). DNA was extracted from peripheral leukocytes of the patients and rs751141 was genotyped. The A allele frequency of rs751141 was significantly lower in DN patients (20.94%) compared with non-DN controls (27...
2018: Journal of Diabetes Research
Branko Srećković, Ivan Soldatovic, Emina Colak, Igor Mrdovic, Mirjana Sumarac-Dumanovic, Hristina Janeski, Nenad Janeski, Jasna Gacic, Vesna Dimitrijevic-Sreckovic
BACKGROUND: Abdominal adiposity has a central role in developing insulin resistance (IR) by releasing pro-inflammatory cytokines. Patients with metabolic syndrome (MS) have higher values of homocysteine. Hyperhomocysteinemia correlates with IR, increasing the oxidative stress. Oxidative stress causes endothelial dysfunction, hypertension and atherosclerosis. The objective of the study was to examine the correlation of homocysteine with siMS score and siMS risk score and with other MS co-founding factors...
April 6, 2018: Drug Metabolism and Personalized Therapy
Nan Hee Kim, Jin Seong Hyeon, Nam Hoon Kim, Ahreum Cho, Gayoung Lee, Seo Young Jang, Mi-Kyung Kim, Eun Young Lee, Choon Hee Chung, Hunjoo Ha, Geum Sook Hwang
Diabetic kidney disease (DKD) involves various pathogenic processes during progression to end stage renal disease, and activated metabolic pathways might be changing based on major pathophysiologic mechanisms as DKD progresses. In this study, nuclear magnetic resonance spectroscopy (NMR)-based metabolic profiling was performed in db/db mice to suggest potential biomarkers for early detection and its progression. We compared concentrations of serum and urinary metabolites between db/m and db/db mice at 8 or 20 weeks of age and investigated whether changes between 8 and 20 weeks in each group were significant...
April 2, 2018: Archives of Biochemistry and Biophysics
Pembe Soylu Ustkoyuncu, Mustafa Kendirci, Fatih Kardas, Songul Gokay, Huseyin Per, Ayse Kacar Bayram
BACKGROUND: Disorders of intracellular cobalamin (Cbl) metabolism are classified from A to J according to biochemical phenotype, and genetic and complementation analyses. CblD-deficient patients present with developmental, hematologic, neurologic, and metabolic findings. CLINICAL OBSERVATION: An 11-year-old boy presented with neutropenia, increased mean corpuscular volume, psychomotor retardation, and seizures. His plasma total homocysteine and urinary methylmalonic acid levels were elevated, and a homozygous nonsense mutation [p...
April 3, 2018: Journal of Pediatric Hematology/oncology
Lyn L Kailing, Daniela Bertinetti, Caroline E Paul, Tomasz Manszewski, Mariusz Jaskolski, Friedrich W Herberg, Ioannis V Pavlidis
S -adenosyl-L-homocysteine (SAH) hydrolases (SAHases) are involved in the regulation of methylation reactions in many organisms and are thus crucial for numerous cellular functions. Consequently, their dysregulation is associated with severe health problems. The SAHase-catalyzed reaction is reversible and both directions depend on the redox activity of nicotinamide adenine dinucleotide (NAD+ ) as a cofactor. Therefore, nicotinamide cofactor biomimetics (NCB) are a promising tool to modulate SAHase activity...
2018: Frontiers in Microbiology
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