Consulta: subjectFacets:"Homocysteine"
Registros recuperados: 13
Data/hora: 29/05/2024 03:45:13

Association of homocysteine and methylene tetrahydrofolate reductase (MTHFR C677T) gene polymorphism with coronary artery disease (CAD) in the population of North India
Provedor de dados: Genetics and Molecular Biology
Autores: Tripathi,Rajneesh; Tewari,Satyendra; Singh,Prabhat Kumar; Agarwal,Sarita.
The implications of the methylene tetrahydrofolate reductase (MTHFR) gene and the level of homocysteine in the pathogenesis of coronary artery disease (CAD) have been extensively studied in various ethnic groups. Our aim was to discover the association of MTHFR (C677T) polymorphism and homocysteine level with CAD in north Indian subjects. The study group consisted of 329 angiographically proven CAD patients, and 331 age and sex matched healthy individuals as controls. MTHFR (C677T) gene polymorphism was detected based on the polymerase chain reaction and restriction digestion with HinfI. Total homocysteine plasma concentration was measured using immunoassay. T allele frequency was found to be significantly higher in patients than in the control group. We...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Angiography; CAD; Homocysteine; MTHFR polymorphism.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000200004

Evaluation of oxidative stress markers and cardiovascular risk factors in Fabry Disease patients
Provedor de dados: Genetics and Molecular Biology
Autores: Müller,Karen B.; Galdieri,Luciano C.; Pereira,Vanessa G.; Martins,Ana M.; D'Almeida,Vânia.
Fabry Disease, an X-linked inborn error of metabolism, is characterized by progressive renal insufficiency, with cardio and cerebrovascular involvement. Homocysteine (Hcy) is considered a risk factor for vascular diseases, but the mechanisms by which it produces cardiovascular damage are still poorly understood. Regarding the vascular involvement in FD patients, the analysis of factors related to thromboembolic events could be useful to improving our understanding of the disease. The aim of this study was to evaluate plasma Hcy and other parameters involved in the methionine cycle, as well as oxidative stress markers. The sample consisted of a group of 10 male FD patients and a control group of 8 healthy individuals, paired by age. Venous blood was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Inborn errors of metabolism; Fabry Disease; Homocysteine; Oxidative stress.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000300006

Methionine + cystine levels and vitamin B6 supplementation on performance and enzyme expression of methionine metabolism of gilts from 75 to 100 kg
Provedor de dados: Revista Brasileira de Zootecnia
Autores: Sangali,Cleiton Pagliari; Gasparino,Eliane; Vasconcellos,Ricardo Souza; Fachinello,Marcelise Regina; Monteiro,Alessandra Nardina Trícia Rigo; Esteves,Lucas Antonio Costa; Bonagurio,Lucas Pimentel; Pozza,Paulo Cesar.
ABSTRACT This study was carried out to evaluate the effect of different levels of standardized ileal digestible (SID) methionine + cystine (Met+Cys) and vitamin B6 supplementation on the performance, blood variables, and gene expression of enzymes involved in methionine metabolism in female pigs between 75 and 100 kg. Fifty six female pigs were used (Talent × Topigs 20), averaging 75.06±1.68 kg in initial weight, allotted in a completely randomized block design arranged in a 2 × 4 factorial scheme, composed of two vitamin B6 supplementation levels (1.58 and 3.58 mg/kg) and four levels of SID Met+Cys (0.370, 0.470, 0.570, and 0.670%), with seven replicates and one animal per experimental unit. No interactions between vitamin B6 supplementation and SID...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Blood variable; Cystathionine-γ-lyase; Homocysteine; Methionine synthase; Performance; Pigs.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000300223

Effects of isoflavone on oxidative stress parameters and homocysteine in postmenopausal women complaining of insomnia
Provedor de dados: Biological Research
Autores: BRANDÃO,LETÍCIA C; HACHUL,HELENA; BITTENCOURT,LIA R; BARACAT,EDMUND C; TUFIK,SERGIO; D'ALMEIDA,VÂNIA.
Sleep disorders have an increased incidence after menopause. The objective of this work was to evaluate the effects of isoflavone on some oxidative stress markers in postmenopausal women complaining of insomnia. Women aged between 50-65 years (n=38) were recruited and assigned to a double-blind placebo controlled study for 4 months. The treated group received 100 mg/day of isoflavones. Blood collections were conducted on three different occasions to assess total glutathione; superoxide dismutase and catalase in erythrocytes; lipid peroxidation; and homocysteine plasma concentrations. No differences between the groups were observed. However, all the patients seem to improve their oxidative stress status and homocysteine concentration after treatment....
Tipo: Journal article
Palavras-chave: Homocysteine; Isoflavones; Insomnia; Menopause; Oxidative stress.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300002

Helicobacter pylori Infection is a Significant Factor Risk for Hyperhomocysteinemia in the Patients with Coronary Artery Disease
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Fallah,Soudabeh; Moradi,Nariman; Reza,Fadaei; Reza,Ahmadi; Azardokht,Tabatabei; Seifi,Morteza.
ABSTRACT This work aimed to determine whether seropositivity to Helicobacter pylori infection was an independent risk factor for hyperhomocysteinemia patients with cardiovascular disease. The H. pylori IgG, IgA and homocystein levels in 96 patients with cardiovascular disease and 64 participants free of cardiovascular disease as control subjects were determined by ELISA assay. The results showed that seropositivity to H. pylori IgG and IgA levels of coronary artery disease (CAD)patients was significantly higher than the controls and CAD patients with H. pylori IgG and IgA negative antibodies. A significant correlation was found between the seropositivity to H. pylori IgG and homocysteine levels of CAD patients in comparison with the controls and CAD...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cardiovascular disease; ELISA assay; Homocysteine; Helicobacter pylori.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100304

Hyperhomocystinemia in patients with coronary artery disease
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Faria-Neto,J.R.; Chagas,A.C.P.; Bydlowski,S.P.; Lemos Neto,P.A.; Chamone,D.A.; Ramirez,J.A.F.; da Luz,P.L.
Hyperhomocystinemia has been related to an increased risk of cardiovascular disease in several studies. The C677T polymorphism for the gene that encodes the methylenetetrahydrofolate reductase enzyme (MTHFR) and low plasma folate levels are common causes of hyperhomocystinemia. Due to differences in nutritional patterns and genetic background among different countries, we evaluated the role of hyperhomocystinemia as a coronary artery disease (CAD) risk factor in a Brazilian population. The relation between homocysteine (Hcy) and the extent of CAD, measured by an angiographic score, was determined. A total of 236 patients referred for coronary angiography for clinical reasons were included. CAD was found in 148 (62.7%) patients and 88 subjects had normal or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hyperhomocystinemia; Homocysteine; Methylenetetrahydrofolate reductase; Atherosclerosis; Folic acid deficiency.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000400005

Homocysteine induces glyceraldehyde-3-phosphate dehydrogenase acetylation and apoptosis in the neuroblastoma cell line Neuro2a
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Fang,M.; Jin,A.; Zhao,Y.; Liu,X.
High plasma levels of homocysteine (Hcy) promote the progression of neurodegenerative diseases. However, the mechanism by which Hcy mediates neurotoxicity has not been elucidated. We observed that upon incubation with Hcy, the viability of a neuroblastoma cell line Neuro2a declined in a dose-dependent manner, and apoptosis was induced within 48 h. The median effective concentration (EC50) of Hcy was approximately 5 mM. Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) nuclear translocation and acylation has been implicated in the regulation of apoptosis. We found that nuclear translocation and acetylation of GAPDH increased in the presence of 5 mM Hcy and that higher levels of acetyltransferase p300/CBP were detected in Neuro2a cells. These findings...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homocysteine; Glyceraldehyde-3-phosphate dehydrogenase; Apoptosis; Acetylate; P300/CBP.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000200606

Polymorphisms in genes MTHFR, MTR and MTRR are not risk factors for cleft lip/palate in South Brazil
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Brandalize,A.P.C.; Bandinelli,E.; Borba,J.B.; Félix,T.M.; Roisenberg,I.; Schüler-Faccini,L.
Non-syndromic cleft lip and palate (CL/P) occurs due to interaction between genetic and environmental factors. Abnormalities in homocysteine metabolism may play a role in its etiology due to polymorphisms in genes involved in this pathway. Because of the involvement of MTHFR, MTR and MTRR genes with folate metabolism and the evidence that maternal use of folic acid in early pregnancy reduces the risk for CL/P, we evaluated the influence of their polymorphisms on the etiology of CL/P through a case-control study. The analyses involved 114 non-syndromic phenotypically white children with clefts (case) and 110 mothers, and 100 non-affected (control) children and their mothers. The polymorphisms 677C&gt;T of MTHFR, 2756A&gt;G of MTR, and 66A&gt;G of MTRR genes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homocysteine; Cleft lip/palate; Methylenetetrahydrofolate reductase; Methionine synthase; Methionine synthase reductase.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007000600006

Quality of life on hemodialysis and inflammation: a descriptive analysis
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Bacci,M.R.; Adami,F.; Figueiredo,F.W.S.; Alves,B.C.A.; da Veiga,G.L.; Fonseca,F.L.A.
Chronic kidney disease (CKD) is highly prevalent worldwide. Patients with CKD on hemodialysis are more likely to present behavioral changes and worse quality of life as a result of their routine and complications. They also have higher levels of cytokines. The aim of this study is to assess the relationship between the inflammatory profile and quality of life measured by KDOQL-SF36 in hemodialysis outpatients. Patients older than 21 years of age and on routine hemodialysis for at least 6 months with treatment on a regular weekly basis were included and their anthropometric parameters and serum inflammatory markers were evaluated. Thirty patients consented to participate. Homocysteine (Hcy) levels were correlated with worse glomerular filtration rate (GFR;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quality of life; Hemodialysis; Inflammation; Homocysteine.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000600608

Effects of rosiglitazone on serum paraoxonase activity and metabolic parameters in patients with type 2 diabetes mellitus
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Atamer,Y.; Atamer,A.; Can,A.S.; Hekimoğlu,A.; Ilhan,N.; Yenice,N.; Koçyiğit,Y.
Human serum paraoxonase contributes to the anti-atherogenic effect of high-density lipoprotein cholesterol (HDL-C) and has been shown to protect both low-density lipoprotein cholesterol (LDL-C) and HDL-C against lipid peroxidation. We investigated the effects of rosiglitazone on paraoxonase activity and metabolic parameters in patients with type 2 diabetes mellitus [50 patients (30 males, 20 females); mean±SD age: 58.7±9.2 years, body mass index: 28.2±4.1'kg/m2], in whom glucose control could not be achieved despite treatment with metformin, sulphonylurea, and/or insulin. The patients were given 4'mg/day rosiglitazone for 3 months in addition to their usual treatment. Serum paraoxonase activity, malondialdehyde, homocysteine, and lipid profile were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rosiglitazone; Diabetes mellitus type 2; Paraoxonase; Lipoproteins; Homocysteine; Lipid peroxidation.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000600528

The MTR A2756G polymorphism is associated with an increase of plasma homocysteine concentration in Brazilian individuals with Down syndrome
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Biselli,J.M; Goloni-Bertollo,E.M; Haddad,R; Eberlin,M.N; Pavarino-Bertelli,E.C.
Individuals with Down syndrome (DS) present decreased homocysteine (Hcy) concentration, reflecting a functional folate deficiency secondary to overexpression of the cystathionine ß-synthase gene. Since plasma Hcy may be influenced by genetic polymorphisms, we evaluated the influence of C677T and A1298C polymorphisms in the methylenetetrahydrofolate reductase gene (MTHFR), of A2756G polymorphism in the methionine synthase gene (MTR), and of A80G polymorphism in the reduced folate carrier 1 gene on Hcy concentrations in Brazilian DS patients. Fifty-six individuals with free trisomy 21 were included in the study. Plasma Hcy concentrations were measured by liquid chromatography_tandem mass spectrometry with linear regression coefficient r² = 0.9996, average...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Down syndrome; Trisomy 21; Polymorphism; Homocysteine; Mass spectrometry (LC-MS/MS).
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000100006

Genetics of homocysteine metabolism and associated disorders
Provedor de dados: Brazilian Journal of Medical and Biological Research
Autores: Brustolin,S.; Giugliani,R.; Félix,T.M.
Homocysteine is a sulfur-containing amino acid derived from the metabolism of methionine, an essential amino acid, and is metabolized by one of two pathways: remethylation or transsulfuration. Abnormalities of these pathways lead to hyperhomocysteinemia. Hyperhomocysteinemia is observed in approximately 5% of the general population and is associated with an increased risk for many disorders, including vascular and neurodegenerative diseases, autoimmune disorders, birth defects, diabetes, renal disease, osteoporosis, neuropsychiatric disorders, and cancer. We review here the correlation between homocysteine metabolism and the disorders described above with genetic variants on genes coding for enzymes of homocysteine metabolism relevant to clinical practice,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Homocysteine; Hyperhomocysteinemia; Folate metabolism; Single nucleotide polymorphism; Susceptibility genes.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000100001

Effect of methionine load on homocysteine levels, lipid peroxidation and DNA damage in rats receiving ethanol
Provedor de dados: Brazilian Journal of Pharmaceutical Sciences
Autores: Jordao Júnior,Alceu Afonso; Domenici,Fernanda Aparecida; Lataro,Renata Cristina; Portari,Guilherme Vannucchi; Vannucchi,Helio.
Changes in the metabolism of methionine can cause hyperhomocysteinemia, inducing a triad of atherosclerosis, hypertension, and increased oxidative stress. The generation of free radicals and oxidative damage to DNA is important in the liver damage caused by ethanol. In this study, the effect of methionine overload associated or otherwise with acute administration of ethanol on homocysteine values, damage to DNA, lipoperoxidation and vitamin E was evaluated. Thirty rats were divided into 3 groups: Group Ethanol 24 hours (EG24), Group Methionine 24 hours (MG24), and Group Methionine and Ethanol 24 hours (MEG24). TBARS, vitamin E, GS and, homocysteine values were determined and the Comet assay was carried out. Increased GSH, vitamin E and homocysteine levels...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methionine; Homocysteine; Free Radicals; Antioxidants; Ethanol/induced damage.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502009000400014