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Hyperhomocysteinemia

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https://www.readbyqxmd.com/read/28091526/a-disrupted-transsulphuration-pathway-results-in-accumulation-of-redox-metabolites-and-induction-of-gametocytogenesis-in-malaria
#1
Divya Beri, Balu Balan, Shweta Chaubey, Suraj Subramaniam, Bachu Surendra, Utpal Tatu
Intra-erythrocytic growth of malaria parasite is known to induce redox stress. In addition to haem degradation which generates reactive oxygen species (ROS), the parasite is also thought to efflux redox active homocysteine. To understand the basis underlying accumulation of homocysteine, we have examined the transsulphuration (TS) pathway in the parasite, which is known to convert homocysteine to cysteine in higher eukaryotes. Our bioinformatic analysis revealed absence of key enzymes in the biosynthesis of cysteine namely cystathionine-β-synthase and cystathionine-γ-lyase in the parasite...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28075397/the-sulfur-metabolite-lanthionine-evidence-for-a-role-as-a-novel-uremic-toxin
#2
REVIEW
Alessandra F Perna, Miriam Zacchia, Francesco Trepiccione, Diego Ingrosso
Lanthionine is a nonproteinogenic amino acid, composed of two alanine residues that are crosslinked on their β-carbon atoms by a thioether linkage. It is biosynthesized from the condensation of two cysteine molecules, while the related compound homolanthionine is formed from the condensation of two homocysteine molecules. The reactions can be carried out by either cystathionine-β-synthase (CBS) or cystathionine-γ-lyase (CSE) independently, in the alternate reactions of the transsulfuration pathway devoted to hydrogen sulfide biosynthesis...
January 10, 2017: Toxins
https://www.readbyqxmd.com/read/28061433/lovastatin-upregulates-microrna-29b-to-reduce-oxidative-stress-in-rats-with-multiple-cardiovascular-risk-factors
#3
Fu Wang, Hui Ma, Wen-Jing Liang, Jing-Jing Yang, Xue-Qing Wang, Mei-Rong Shan, Yuan Chen, Min Jia, Ya-Ling Yin, Xue-Ying Sun, Jia-Ning Zhang, Qi-Sheng Peng, Yu-Guo Chen, Li-Ying Liu, Peng Li, Tao Guo, Shuang-Xi Wang
AIMS: Proteasome-linked oxidative stress is believed to cause endothelial dysfunction, an early event in cardiovascular diseases (CVD). Statin, as HMG-CoA reductase inhibitor, prevents endothelial dysfunction in CVD. However, the molecular mechanism of statin-mediated normalization of endothelial function is not completely elucidated. METHODS AND RESULTS: Lovastatin time/dose-dependently increased miR-29b expression and decreased proteasome activity in cultured human umbilical vein endothelial cells (HUVECs)...
January 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28058155/bilateral-papillophlebitis-in-a-patient-with-mutation-of-metilenetetrahydrofolate-reductase-enzyme
#4
Hüseyin Güzel, Banu Turgut Öztürk, Şansal Gedik, Berker Bakbak, Abdullah Beyoğlu, Nadir Koçak
Papillophlebitis is known as central retinal vein occlusion seen in young patients. It usually presents as unilateral optic disc edema with cotton wool spots and hemorrhage in the peripapillary region. As it may be due to many autoimmune and inflammatory causes, a thorough systemic evaluation of the patient is warranted. In this case report we describe a bilateral, simultaneous papillophlebitis case thought to be related to hyperhomocysteinemia secondary to C677T polymorphism of methylenetetrahyrofolate reductase enzyme...
August 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28057043/rapid-healing-of-a-patient-with-dramatic-subacute-combined-degeneration-of-spinal-cord-a-case-report
#5
Florian C Roessler, Stephanie Wolff
BACKGROUND: Prevalence of cobalamin deficiency is high especially in older patients and an immediate therapy start is necessary to prevent irreversible neurological damages. Unfortunately, the diagnosis of cobalamin deficiency is difficult and at present, there is no consensus for diagnosis of this deficiency. Therefore, we aim to elucidate a meaningful diagnostic pathway by a case report with an initially misleading medical history. CASE PRESENTATION: A 57 year-old Caucasian man suffering from dramatic myelosis of the cervical posterior columns...
January 3, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28050421/the-effect-of-folic-acid-supplementation-on-hyperhomocysteinemia-and-pulmonary-function-parameters-in-chronic-obstructive-pulmonary-disease-a-pilot-study
#6
Naushad Ahmad Khan, Harish Saini, Govind Mawari, Suman Kumar, Harmanjit Singh Hira, Mradul Kumar Daga
INTRODUCTION: Preliminary studies have established the elevated plasma total Homocysteine (tHcy) levels as a risk factor for Chronic Obstructive Pulmonary Disease (COPD). However, studies describing plasma tHcy levels and their relationship to folic acid supplementation and Forced Expiratory Volume in 1 Second (FEV1) status in COPD patients are still lacking. AIM: We investigated the role of hyperhomocysteinemia in COPD and then prospectively examined the relationship between plasma tHcy concentration and effect of folic acid supplementation on FEV1 status in COPD patients...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28030819/hyperhomocysteinemia-results-from-and-promotes-hepatocellular-carcinoma-via-cyp450-metabolism-by-cyp2j2-dna-methylation
#7
Donghong Zhang, Jinli Lou, Xu Zhang, Lin Zhang, Fei Wang, Danfei Xu, Na Niu, Yidong Wang, Yue Wu, Wei Cui
Hyperhomocysteinemia (HHcy) can result from liver disease or dysfunction and further alters intracellular lipid metabolism. Cytochrome P450 (CYP) arachidonic acid epoxygenases are expressed in human cancers and promote cancer metastasis. This study explored the interaction of Hcy and CYP450 metabolism in hepatocellular carcinoma (HCC). The levels of 4-epoxyeicosatrienoic acid (EET) isomers and their generative enzyme CYP2J2 level as well as intracellular Hcy level were higher in 42 cases of HCC than in paired non-tumor tissue...
December 24, 2016: Oncotarget
https://www.readbyqxmd.com/read/28024507/-correlation-of-thrombosis-and-prothrombotic-state-with-coagulation-factor-v-gene-polymorphism-and-apcr-hhcy
#8
Li-Xia Gao, Qiu-Lan Ding, Ke-Xiong Wu, Jun Hu, Xue-Feng Wang, Chuan-Ling Dong, Qin Dai, Bing Zhang, Jin Dai, Ping He, Xue-Ping Zhang, Yun-Xia Wang
OBJECTIVE: To investigate the correlation of patients with thrombosis or prothrombotic status with hyperhomocysteinemia (HHcy), activated protein C-resistance(APCR) and gene polymorphism of coagulation factor V. METHODS: Three hundred healthy voluteers were selected as controls, 223 cases of thrombosis (80 cases of cerebral infarction of CT, the MI of 82 cases of myocardial infarction, venous thrombosis of VTE 61 cases), 270 cases of patients with prothrombotic state (76 cases of pregnancy disease of PIH, 62 cases of chronic obstructive pulmonary disease (COPD), 60 cases of diabetes(DM) and 72 cases of cancer) were enrolled in this study...
December 2016: Zhongguo Shi Yan Xue Ye Xue za Zhi
https://www.readbyqxmd.com/read/28003785/central-retinal-vein-occlusion-associated-with-high-blood-levels-of-lipoprotein-a-is-lipoprotein-a-a-reliable-marker-for-identification-of-predisposed-individuals
#9
Piergiacomo Grassi, Alberto Salicone, Lorenzo Motta, Mario Salvatore Motta
To report a case of central retinal vein occlusion (CRVO) associated with abnormal elevation of Lipoprotein (a) [Lp(a)] plasma levels, without local or systemic risk factors. A 74-year-old man was referred to our department for cataract surgery in his left eye, and his anamnesis was negative for systemic diseases. Two months later, the patient presented with sudden visual loss in his operated eye, and comprehensive ophthalmic examination was performed, including Fluorescein Angiography (FA) and Optical Coherent Tomography (OCT)...
October 2016: Saudi Journal of Ophthalmology: Official Journal of the Saudi Ophthalmological Society
https://www.readbyqxmd.com/read/28002332/the-association-of-the-mthfr-c677t-polymorphism-with-inflammatory-bowel-diseases-in-the-israeli-jewish-population-an-example-of-genetic-heterogeneity
#10
Amir Karban, Tzah Feldman, Matti Waterman, Ronit Leiba, Edna Efrati
MTHFR C677T is a common gene polymorphism that has been shown to be associated with hyperhomocysteinemia. Studies on the role of MTHFR in inflammatory bowel diseases (IBD) have yielded conflicting results, perhaps due in part to genetic heterogeneity. The prevalence of the MTHFR C677T variant allele varies according to Jewish subpopulations: Ashkenazi vs non-Ashkenazi. The aim of this study was to examine the association between MTHFR C677T genotype and IBD in the different Jewish populations.DNA samples were assessed for the presence of the MTHFR C677T variant allele in 445 Jewish Israeli IBD patients: 338 with Crohn's disease [CD] (214 Ashkenazi and 124 non-Ashkenazi Jews) and 107 with ulcerative colitis [UC] (73 Ashkenazi and 34 non-Ashkenazi Jews), and in 347 healthy controls: 173 Ashkenazi and 174 Non-Ashkenazi Jews...
December 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27994357/clinical-correlates-of-leukoaraiosis-a-study-of-175-patients
#11
Rustom S Wadia, Sandesh K Ghiya, Joshita Singh, Santosh M Sontakke, Vishwas Bharadwaj, Rahul V Sonawane, Yogesh P Bade, K Shrikanth, Nikhil Goli, Rohit Singh Chauhan, Nilesh A Nadkarni
BACKGROUND: In India, the correlates of leukoaraiosis (LA) have not been widely reported. This study was designed to investigate the factors which correlate with LA. MATERIALS AND METHODS: We included patients with LA who consented for the study and graded their severity on the basis of Fazekas scale. We excluded patients with LA who did not consent/cooperate for the study as also patients with other white matter changes which mimic LA. RESULTS: LA is a common and under-rated cause of disability...
October 2016: Annals of Indian Academy of Neurology
https://www.readbyqxmd.com/read/27993887/communication-homocysteine-thioretinaco-ozonide-oxidative-phosphorylation-biosynthesis-of-phosphoadenosine-phosphosulfate-and-the-pathogenesis-of-atherosclerosis
#12
Kilmer S McCully
The formation of phosphoadenosine phosphosulfate (PAPS) is accomplished by the action of the enzyme 3'-phosphoadenosine 5'-phosphosulfate synthase (PAPSS) in two sequential reactions, consisting of (1) reaction of inorganic sulfate with adenosine triphosphate (ATP) to form adenosine phosphosulfate (APS) and pyrophosphate and (2) reaction of APS with inorganic phosphate to form PAPS and adenosine diphosphate (ADP). The hydrolysis of guanosine triphosphate (GTP) is coordinated with synthesis of APS in a reaction sequence which provides the chemical energy for synthesis of APS...
December 2016: Annals of Clinical and Laboratory Science
https://www.readbyqxmd.com/read/27993685/simvastatin-inhibits-homocysteine-induced-crp-generation-via-interfering-with-the-ros-p38-erk1-2-signal-pathway-in-rat-vascular-smooth-muscle-cells
#13
Xiaoming Pang, Jigang Si, Shouzhu Xu, Yuxia Li, Juntian Liu
Inflammation plays a pivotal role throughout the formation and progression of atherosclerosis. As the most representative inflammatory marker, C-reactive protein (CRP) directly participates in the initiation and development of atherosclerosis. The elevated homocysteine (Hcy) level in plasma is an independent risk factor for atherosclerosis. We previously reported that Hcy produces a pro-inflammatory effect by stimulating CRP expression in vascular smooth muscle cells (VSMCs). The present study observed the effect of simvastatin on Hcy-induced CRP expression in VSMCs and the molecular mechanisms...
January 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/27992360/chronic-kidney-disease-induces-inflammatory-cd40-monocyte-differentiation-via-homocysteine-elevation-and-dna-hypomethylation
#14
Jiyeon Yang, Pu Fang, Daohai Yu, Lixiao Zhang, Daqing Zhang, Xiaohua Jiang, William Y Yang, Teodoro Bottiglieri, Satya P Kunapuli, Jun Yu, Eric T Choi, Yong Ji, Xiaofeng Yang, Hong Wang
RATIONALE: Patients with chronic kidney disease (CKD) develop hyperhomocysteinemia and have a higher cardiovascular mortality than those without hyperhomocysteinemia by 10-fold. OBJECTIVE: We investigated monocyte differentiation in human CKD and cardiovascular disease (CVD). METHODS AND RESULTS: We identified CD40 as a CKD-related monocyte activation gene using CKD-monocyte -mRNA array analysis and classified CD40 monocyte (CD40(+)CD14(+)) as a stronger inflammatory subset than the intermediate monocyte (CD14(++)CD16(+)) subset...
November 11, 2016: Circulation Research
https://www.readbyqxmd.com/read/27982479/hypermethylation-causes-and-consequences-in-skeletal-muscle-myopathy
#15
Avisek Majumder, JyotirmayaBehera, Navena Jeremic, Suresh C Tyagi
A detrimental consequence of hypermethylation is hyperhomocysteinemia (HHcy), that causes oxidative stress, inflammation and matrix degradation, which leads to multi-pathology in different organs. Although, it is well known that hypermethylation leads to overall gene silencing and hypomethylation leads to overall gene activation, the role of such process in skeletal muscle dysfunction during HHcy condition is unclear. In this study, we emphasized the multiple mechanisms including epigenetic alteration by which HHcy causes skeletal muscle myopathy...
December 16, 2016: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/27957316/effect-of-folic-acid-therapy-on-homocysteine-level-in-patients-with-atherosclerosis-or-buerger-s-disease-and-in-healthy-individuals-a-clinical-trial
#16
Mohammad Hadi Saeed Modaghegh, Hassan Ravari, Mohammad Zare Haghighi, Ata'ollah Rajabnejad
BACKGROUND: Hyperhomocysteinemia is considered a risk factor for atherosclerosis and some other vascular diseases such as Buerger's disease. OBJECTIVE: The aim of this study was to measure the Homocysteine levels in 3 different groups of participants (Buerger's disease, atherosclerosis patients, and healthy cases) and determine the therapeutic effect of folic acid therapy on homocysteine levels for these three groups. METHODS: This nonrandomized clinical trial study was conducted in the vascular and endovascular surgery research center of Mashhad University of Medical Sciences in Mashhad, Iran...
October 2016: Electronic Physician
https://www.readbyqxmd.com/read/27938397/risk-factors-of-peripheral-arterial-disease-a-case-control-study-in-sri-lanka
#17
Janaka Weragoda, Rohini Seneviratne, Manuj C Weerasinghe, S M Wijeyaratne
BACKGROUND: Peripheral artery disease (PAD) is an important global health problem and contributes to notable proportion of morbidity and mortality. This particular manifestation of systemic atherosclerosis is largely under diagnosed and undertreated. For sustainable preventive strategies in a country, it is mandatory to identify country-specific risk factors. We intended to assess the risk factors of PAD among adults aged 40-74 years. METHODS: This case control study was conducted in 2012-2013 in Sri Lanka...
December 9, 2016: BMC Research Notes
https://www.readbyqxmd.com/read/27936205/hyperhomocysteinemia-in-apoe-mice-leads-to-overexpression-of-enhancer-of-zeste-homolog-2-via-mir-92a-regulation
#18
Yang Xiaoling, Zhao Li, Li ShuQiang, Ma Shengchao, Yang Anning, Ding Ning, Li Nan, Jia Yuexia, Yang Xiaoming, Li Guizhong, Jiang Yideng
Hyperhomocysteinemia (HHcy) is an independent risk factor for cardiovascular diseases, such as atherosclerosis. HHcy promotes atherogenesis by modifying the histone methylation patterns and miRNA regulation. In this study, we investigated the effects of homocysteine (Hcy) on the expression of enhancer of zeste homolog 2 (EZH2), and tested our hypothesis that Hcy-induced atherosclerosis is mediated by increased EZH2 expression, which is regulated by miR-92a. The levels of EZH2 and H3K27me3 were increased in the aorta of ApoE-/- mice fed a high-methionine diet for 16 weeks, whereas miR-92a expression was decreased...
2016: PloS One
https://www.readbyqxmd.com/read/27932944/role-of-homocysteine-in-the-ischemic-stroke-and-development-of-ischemic-tolerance
#19
REVIEW
Ján Lehotský, Barbara Tothová, Maria Kovalská, Dušan Dobrota, Anna Beňová, Dagmar Kalenská, Peter Kaplán
Homocysteine (Hcy) is a toxic, sulfur-containing intermediate of methionine metabolism. Hyperhomocysteinemia (hHcy), as a consequence of impaired Hcy metabolism or defects in crucial co-factors that participate in its recycling, is assumed as an independent human stroke risk factor. Neural cells are sensitive to prolonged hHcy treatment, because Hcy cannot be metabolized either by the transsulfuration pathway or by the folate/vitamin B12 independent remethylation pathway. Its detrimental effect after ischemia-induced damage includes accumulation of reactive oxygen species (ROS) and posttranslational modifications of proteins via homocysteinylation and thiolation...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27929536/hyperhomocysteinemia-causes-er-stress-and-impaired-autophagy-that-is-reversed-by-vitamin-b-supplementation
#20
Madhulika Tripathi, Cheng Wu Zhang, Brijesh Kumar Singh, Rohit Anthony Sinha, Kyaw Thu Moe, Deidre Anne DeSilva, Paul Michael Yen
Hyperhomocysteinemia (HHcy) is a well-known risk factor for stroke; however, its underlying molecular mechanism remains unclear. Using both mouse and cell culture models, we have provided evidence that impairment of autophagy has a central role in HHcy-induced cellular injury in the mouse brain. We observed accumulation of LC3B-II and p62 that was associated with increased MTOR signaling in human and mouse primary astrocyte cell cultures as well as a diet-induced mouse model of HHcy, HHcy decreased lysosomal membrane protein LAMP2, vacuolar ATPase (ATP6V0A2), and protease cathepsin D, suggesting that lysosomal dysfunction also contributed to the autophagic defect...
December 8, 2016: Cell Death & Disease
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