高同型半胱氨酸血症的神经毒性机制研究进展

高同型半胱氨酸血症(HHcy)是由同型半胱氨酸(Hcy)代谢异常引起的。HHcy既是心脑血管疾病的独立危险因素,也与多种神经退行性疾病和精神疾病密切相关。HHcy主要通过血管和神经毒性发挥致病作用。本文就近年来HHcy的致神经毒性作用的机制做一综述。     

高同型半胱氨酸血症与静脉血栓形成

轻到中度的高同型半胱氨酸血症（HHcy)是心血管疾病的一个独立危险因子。目前大部分研究认为。HHcy也是静脉血栓形成的危险因子,但仍存在争议。本文对同型半胱氨酸（Hcy)的代谢及其影响因素,HHcy与静脉血栓形成的关系,以及HHcy促进血栓形成的机制等进行综述。     

高同型半胱氨酸血症与静脉血栓形成

轻到中度的高同型半胱氨酸血症(HHcy)是心血管疾病的一个独立危险因子。目前大部分研究认为,HHcy也是静脉血栓形成的危险因子,但仍存在争议。本文对同型半胱氨酸(Hcy)的代谢及其影响因素,HHcy与静脉血栓形成的关系,以及HHcy促进血栓形成的机制等进行综述。     

高同型半胱氨酸血症和类风湿关节炎的关系

正同型半胱氨酸(Hcy)是一种含硫非必需氨基酸,同型半胱氨酸代谢酶的活性受损,叶酸、维生素B6、B12的缺乏等因素使人体内Hcy水平升高形成高同型半胱氨酸血症(HHcy)。Hcy升高可以激活类风湿关节炎(RA)患者的免疫系统,而免疫炎性反应可能导致HHcy,其可以促进RA患者动脉粥样硬化的发生,是动脉粥样硬化的独立危险因素。RA是一种导致多关节功能障碍的炎症性自身免疫性疾病。近年发现,因心血     

同型半胱氨酸及其代谢酶基因多态性与心血管病关系的研究进展

基因背景不仅在决定个体对疾病的易感上起重要作用,而且还与疾病的发生、发展有着密切的关系。近年来,高同型半胱氨酸血症（HHcy）与一些疾病如动脉粥样硬化、冠心病、心脑血管疾病、糖尿病等的发病关系日益受到人们的关注。血浆同型半胱氨酸（Hcy）代谢过程中相关代谢酶的基因多态性与这此致疾病的关系成了近年来研究热点。     

同型半胱氨酸的代谢及临床实验室检测

同型半胱氨酸（Homocysteine,Hcy）代谢异常所导致的高同型半胱氨酸血症（Hyperhomocysteinemia,HHcy）与急性心肌梗死、脑卒中、冠状动脉及外周血管病变有关,是导致脑血管、神经系统等疾病的危险因素。本文对Hcy的代谢及临床实验室检测作一综述。     

无症状HHcy患者血Hcy浓度分层与超敏C反应蛋白、尿酸的关系

目的探讨无症状高同型半胱氨酸血症(HHcy)患者随着同型半胱氨酸(Hcy)分层程度的升高,血Hcy水平与超敏C反应蛋白(hs-CRP)、尿酸(UA)的相关性,以及Hcy与炎性因子及UA代谢的关系。方法选取健康体检人群78例,依据Hcy水平分为3组(正常组、轻度HHcy组、中度HHcy组),测定各组患者hs-CRP、UA,比较不同人群Hcy水平与hs-CRP、UA的关系。结果线性相关分析表明Hcy浓度变化与hs-CRP、UA浓度呈正相关;以HHcy为因变量,hs-CRP、UA为自变量进行Logistic回归分析,结果提示hs-CRP、UA浓度与Hcy相关,hs-CRP浓度升高增加HHcy发生风险;与正常组比较,中度HHcy患者UA浓度升高,差异有统计学意义(P0.05)。结论 HHcy患者UA升高,Hcy增高与hs-CRP、UA浓度相关。     

不同采血管对同型半胱氨酸测定结果的影响

同型半胱氨酸(homocysteine,Hcy)是一种含硫氨基酸,是蛋氨酸代谢过程中去甲基化所产生的重要中间产物.近年来,许多研究发现同型半胱氨酸与心血管疾病及脑中风有密切关系,体内同型半胱氨酸浓度被视为心、脑及周围血管疾病的独立危险因子[1,2].     

高同型半胱氨酸血症与脑血管病研究进展

脑血管病是高致残率、高复发率及高死亡率的疾病。近年来,高同型半胱氨酸（HHcy）作为脑血管病 可控的危险因素逐渐受到重视。但Hcy是否是脑血管病的独立危险因素仍存在争议,降低Hcy是否可改善 脑血管病患者的临床预后也存在不同的意见。本文综述了HHcy血症与脑血管病的研究进展。     

脑血管疾病中血清同型半胱氨酸和肌酸激酶的变化及临床意义

同型半胱氨酸（homocysteine,Hcy）是人体内蛋氨酸代谢的中间产物,与体内一碳单位代谢有着密切关系。大量流行病学资料发现,高同型半胱氨酸（Hcy）血症是心脑血管疾病发病的独立危险因子,阐明高Hcy血症发病机制和防治高Hcy血症对控制心脑血管疾病具有重要意义。     

246例血清同型半胱氨酸测定结果的临床分析

目的通过对246例血清同型半胱氨酸(Hcy)测定结果的临床分析,探讨Hcy测定的临床意义。方法应用德国拜耳1650型全自动生化分析仪测定246例住院及门诊患者血清Hcy浓度。结果 55岁以上者Hcy测定结果与55岁以下者差异无统计学意义(P0.05);55岁以上者Hcy阳性率为23.96%,55岁以下者为56.67%,55岁以下者Hcy阳性率明显高于55岁以上者,差异有统计学意义(P0.01);女性Hcy阳性率为41.51%,男性为52.58%,男性明显高于女性,差异有统计学意义(P0.01)。结论 Hcy作为心脑血管疾病的独立致病危险因素,其值增高的患者容易诱发心脑血管疾病。临床应该尽早开展Hcy常规检查,以方便对心脑血管疾病的早期筛查、早期诊断和早期治疗,对于早期干预心脑血管病的危险因素,减少缺血性心脑血管病的发病有重要的临床意义。     

The methylenetetrahydrofolate reductase C677T gene mutation is associated with hyperhomocysteinemia, cardiovascular disease and plasma B-type natriuretic peptide levels in Korea.

BACKGROUND: Hyperhomocysteinemia is known to be a risk factor for cardiovascular diseases and is associated with a common mutation in the 5,10-methylenetetrahydrofolate reductase (MTHFR) gene (677 C>T). The aims of this study were to confirm: 1) the association between the MTHFR C677T mutation and plasma homocysteine (Hcy) levels; 2) the MTHFR C677T mutation as a risk factor; 3) the association of the MTHFR C677T mutation and plasma B-type natriuretic peptide (BNP) levels; and 4) the correlation between Hcy and BNP levels in cardiovascular diseases. METHODS: A total of 227 patients for whom BNP was measured were enrolled in this study. Laboratory parameters included BNP, creatine kinase (CK), the myocardial isoenzyme of CK (CK-MB), troponin I (TnI), Hcy, C-reactive protein (CRP), lactate dehydrogenase (LDH), creatinine and folate. The MTHFR genotype was evaluated by polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) was shown by an electrophoretic technique. RESULTS: The prevalence of TT homozygotes was significantly higher in patients with cardiovascular diseases than in patients without cardiovascular diseases (p=0.0001). Patients homozygous for the TT mutation had the highest plasma Hcy levels compared with wild-type CC homozygotes and CT mutant heterozygotes (p=0.0001). Plasma BNP concentrations were significantly higher in patients with MTHFR C677T mutation compared to patients without the mutation (p<0.05). Plasma BNP concentrations were positively correlated with Hcy concentrations (r=0.196, p<0.001). Multivariate logistic regression analysis showed that elevated concentrations of BNP, CRP, Hcy and the presence of the MTHFR C677T mutation independently contributed to the prediction of cardiovascular diseases. CONCLUSIONS: In cardiovascular diseases, the MTHFR C677T mutation: 1) is associated with plasma Hcy levels; 2) is an independent risk factor for cardiovascular diseases, 3) is associated with plasma BNP levels, and 4) plasma Hcy levels are positively correlated with plasma BNP levels.     

社区常见慢性病血清同型半胱氨酸水平的分析

目的探讨血清同型半胱氨酸水平在社区常见慢性病(糖尿病、高血压、高脂血症、冠心病)中的临床应用价值。方法对2015年1-10月期间在上海市浦东新区沪东社区卫生服务中心进行同型半胱氨酸水平检测的1 605例常见慢性病患者资料进行回顾性研究。另选取117例健康体检者作为健康对照组。采用循环酶法测定同型半胱氨酸水平。结果糖尿病、高血压、冠心病和高脂血症组血清同型半胱氨酸的平均水平均高于健康对照组(P0.05),同型半胱氨酸水平和年龄均呈正相关(P0.05)。结论社区常见慢性病患者中血清同型半胱氨酸升高是1个重要的危险因素。因此,应加强血清中同型半胱氨酸水平的检查,积极干预,减缓疾病的发展。     

同型半胱氨酸检测与临床应用

目的通过检测血浆同型半胱氨酸（Hcy）浓度,探讨Hcy与心脑血管疾病及2型糖尿病早期肾损害的关系。方法选择40～70岁的心脑血管疾病及2型糖尿病住院患者265例,健康体检健康者52例,用RocheP800全自动生化分析仪测定血浆中Hcy浓度。结果心血管病组、脑血管病组、糖尿病B组血浆Hcy水平均显著高于健康对照组（P〈0.05）,糖尿病A组虽高于健康对照组,但是差异无统计学意义。结论高Hcy血症与心血管疾病密切相关,是心血管疾病发病的一个重要危险因子;脑血管疾病与血浆Hcy呈正相关;血浆Hcy浓度随糖尿病肾病的发生及发展逐渐升高。     

成年人群血清胱抑素C与同型半胱氨酸水平升高的疾病谱分析

目的　探讨并分析成年人群血清胱抑素C（Cys-C）和同型半胱氨酸（Hcy）升高的疾病谱。方法　选取空军特色医学中心711例住院和门诊患者,于Beckman AU2700全自动生化分析仪上同时检测Cys-C和Hcy,检测方法分别为免疫比浊法和循环酶法;采用回顾性分析的方法统计所有人群的疾病诊断信息,按照高血压、肿瘤、心脑血管疾病、代谢性疾病（主要包括高尿酸、高血脂等）、高血糖、胃肠道疾病、呼吸系统疾病、泌尿系统疾病、肝胆系统疾病、眼科疾病和甲状腺疾病等进行分类;以Cys-C等于1.05mg/L为界限,分为两组:≤1.05mg/L组（A组:Cys-C ≤1.05mg/L）和＞1.05mg/L组（B组:Cys-C>1.05mg/L）,Hcy>15.0μmol/L认为Hcy升高,分别比较Hcy升高与不升高的疾病诊断内容。结果　在A组,诊断为高血压和胃肠道相关疾病的占比分别为20%和19%,诊断为心脑血管疾病、代谢性疾病及肿瘤的占比平均在10%左右,其余呼吸、泌尿和肝胆等疾病的占比均低于5%。B组中,诊断为高血压的比例最高为33%,占比明显升高,胃肠道疾病的占比明显降低,诊断为心脑血管疾病、胃肠道疾病及代谢性疾病的占比平均在10%左右,其余呼吸、泌尿、肝胆和肿瘤等疾病的占比均≤5%,其余系统疾病较A组差别较小。A组中Hcy>15.0μmol/L诊断为泌尿系统疾病的病例占比为75%,呼吸系统的占比为40%,诊断为其余疾病的占比在30%以下。B组中部分诊断为同类疾病的占比较A组明显增加,增加倍数可达2～7倍,主要体现在以下疾病中:高血压、脑血管病、代谢性疾病、心血管病、糖尿病、胃肠道疾病、呼吸系统疾病、泌尿系统疾病以及肝胆系统疾病。结论　Cys-C伴Hcy升高的疾病诊断多集中于高血压、代谢综合征、心脑血管疾病及肾脏等疾病;Cys-C与Hcy在多种疾病中都具有相关性,二者同时升高对代谢综合征的评估、高血压和心脑血管疾病的诊断,尤其对肾脏病的诊断具有明确的意义。临床应重视Cys-C与Hcy同时检测对不同疾病的诊断价值,合理开具检测项目。     

高同型半胱氨酸血症与炎性反应疾病研究进展

同型半胱氨酸(Hcy)是一种非必需的α-氨基酸,多年来研究发现,Hcy与多种疾病存在内在联系,不仅是公认的心脑血管疾病的独立危险因素,还影响多系统疾病的发生发展。其对多系统多器官造成影响的本质是各种介质的炎性反应,高同型半胱氨酸血症通过上调促炎因子表达,增加氧化应激,促进血管、组织形态重构,导致内皮细胞功能障碍,从而影响各种系统的功能。本文拟通过对高同型半胱氨酸血症与炎性反应疾病相关性的综述,进一步系统地认识高同型半胱氨酸血症。     

视网膜静脉阻塞患者血清同型半胱氨酸水平检测的临床意义

目的 讨论视网膜静脉阻塞(retinal vein occlusion,RVO)患者血浆同型半胱氨酸(homocysteine,Hcy)水平的变化,以研究血浆Hcy升高是否是RVO的危险因素,为治疗和预防该病提供客观依据。方法 采用病例对照研究,收集65例经过统一眼科检查标准确诊RVO且经过系统疾病排除标准筛选的患者作为病例组,其中视网膜中央静脉阻塞(central retinal vein occlusion,CRVO)患者46例,视网膜分支静脉阻塞(branch retinal vein occlusion,BRVO)患者19例; 同期健康体检且既往无眼底血管性疾病病史者65例作为对照组,两组年龄、性别无差异。检测血浆Hcy含量后作统计学比较。结果 RVO病例组的血浆Hcy均值较对照组显著升高(t=6.192,P<0.05)。病例组中CRVO及BRVO患者的血浆Hcy比较差异无统计学意义(t=1.536,P<0.05)。结论 血浆Hcy为RVO的危险因素,降低Hcy的药物可以用于RVO的预防和治疗中。     

Association between homocysteine, vitamin B(6) concentrations and inflammation.

During the last years, a growing body of evidence has been accumulated on the role of hyperhomocysteinemia in the occurrence of coronary artery disease and other arterial occlusive diseases. The mechanism by which high circulating homocysteine concentrations are a risk factor for atherothrombosis is incompletely understood. The present review is aimed to evaluate the role of inflammation in influencing homocysteine (Hcy) and vitamin B(6) concentrations. Results of a large population-based study have suggested that inflammatory markers are the major determinants of Hcy and vitamin B(6) concentrations. This association, independent of the leading factor, may explain, at least in part, why subjects with high concentrations of Hcy and low concentrations of vitamin B(6) have a high risk of developing cardiovascular diseases.     

Plasma levels of homocysteine in patients with white-coat hypertension

Elevated levels of plasma homocysteine (Hcy) is an independent risk factor for cardiovascular diseases. The risk profile of white-coat hypertension (WCHT) is not yet completely clear. In this study, we aim to determine the levels of plasma Hcy in a group of patients with WCHT, and to obtain clinical results by comparing WCHT group with hypertensive and healthy groups. Age, sex and body mass index were matched for 15 normal subjects, 15 patients with WCHT and 15 patients with essential hypertension, and they were included in the study. We measured levels of plasma Hcy in all groups. Levels of plasma Hcy were significantly higher in patients with sustained hypertension than in WCHT group (p = 0.03). They were also significantly higher in patients with WCHT than in control group (p = 0.02). Our data suggest that WCHT subjects are at an increased cardiovascular risk, although this was lower than the risk in patients with sustained hypertension.     

Turkish propolis supresses MCF-7 cell death induced by homocysteine

Elevated plasma homocysteine (Hcy) level is a most important risk factor for various vascular diseases including coronary, cerebral and peripheral arterial and venous thrombosis.Propolis is produced by honeybee from various oils, pollens and wax materials. Therefore, it has various biological properties including antioxidant, antitumor and antimicrobial activities.This study investigated the effects of propolis and Hcy on apoptosis in cancer cells. According to our findings, Hcy induced apoptosis in human breast adenocarcinoma (MCF-7) cells by regulating numerous genes and proteins involved in the apoptotic signal transduction pathway. In contrast, treatment with propolis inhibited caspase- 3 and −9 induced by Hcy in MCF-7 cells. It can be concluded that Hcy may augment the activity of anticancer agents that induce excessive reactive oxygen species (ROS) generation and apoptosis in their target cells. In contrast to the previous studies herein we found that propolis in low doses protected cancer cells inhibiting cellular apoptosis mediated by intracellular ROS-dependent mitochondrial pathway.