ADMA、eNOS及NO水平与急性脑梗死关系的研究
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摘要
目的:缺血性脑血管病在国内外均具有很高的致残率和病死率,内皮功能的损伤是心脑血管疾病的一种普遍现象,随着对其研究的深入,其治疗方向逐渐分为改善缺血区域供血及保护缺血神经细胞两方面,其中血管内皮细胞产生的一氧化氮(NO)是一项重要的内在脑血流调节剂及保护剂。血管内皮细胞在生理状态下持续释放NO,NO是以L-精氨酸为底物,主要由内皮型一氧化氮合酶(eNOS)催化产生。非对称性二甲基精氨酸(ADMA)是L-精氨酸类似物,可与其竞争结合eNOS活性位点抑制NOS活性,减少NO的生成,从而导致内皮功能的受损。本研究通过对脑梗死患者(包括合并高血压患者)血浆ADMA和血清eNOS、NO水平的检测,探讨ADMA致心脑血管疾病的发病机制及eNOS的神经保护作用,为临床早期干预和药物治疗脑梗死提供理论指导和客观依据。
     方法:选取急性脑梗死血压正常患者50例,急性脑梗死合并高血压者60例,健康对照50例,三组间年龄、性别相匹配。脑梗死患者在发病一周内,所有受检对象均至少空腹12小时后静脉取血,分别测定其血浆ADMA和血清eNOS、NO水平。其中ADMA的测定采用高压液相色谱法分析法,eNOS的测定采用ELISA方法,血清NO的测定采用硝酸还原酶法。数值以均数±标准差表示,结果经SPSS11.5统计软件进行统计处理。
     结果:1.急性脑梗死正常血压组血浆ADMA水平(0.73±0.16μmol/L),脑梗死合并高血压组血浆ADMA水平为(1.03±0.22umol/L),健康对照组血浆ADMA水平为(0.47±0.16umol/L),三组间差异具有统计学意义(p<0.05)。并且ADMA与高血压水平(脑梗死合并高血压组)呈正相关(p<0.05),与年龄、性别、TC、TG、吸烟、饮酒等无相关性。
     2.脑梗死合并高血压组患者的血清eNOS水平(47.61±20.21U/ml),明显低于急性脑梗死血压正常组血清eNOS水平(55.70±18.96U/ml)(p<0.05),并且两者均低于正常对照组血清eNOS水平(66.54±24.13U/ml)(P<0.05)。
     3.脑梗死合并高血压组血清NO水平为(55.28±10.78umol/L),脑梗死正常血压组血清NO水平(60.20±14.03umol/L),两组间无显著差别(p>0.05),但均低于正常对照组NO水平(70.27±6.78umol/L),差别有统计学意义(p<0.05)。
     4.高血压分级测定脑梗死合并各级高血压患者的检查指标显示:高血压1级患者的血浆ADMA水平为(0.74±0.23umol/L),均显著低于高血压2级和3级患者,而后两组间差别无显著性(p>0.05);三组间血清eNOS水平比较示:高血压1级组eNOS水平为(51.27±16.76umol/L),高血压2级组为(49.43±19.22umol/L),均较高血压3级组(45.45±14.10umol/L)为高,且差别有显著意义(p<0.05);三组患者血清NO浓度分别为(53.16±11.48、50.87±16.03和46.02±16.82 umol/L),但组间无显著性差异(p>0.05)。
     5.对病例组OCSP分型后进行主要观察指标的比较发现TACI和PACI组ADMA水平较LACI为高,差别有显著意义;TACI及POCI两组的eNOS水平较LACI为低,TACI组NO水平低于LACI组,差别均有显著意义(p<0.05)。
     6.Pearson相关性分析显示:脑梗死正常血压组ADMA水平与eNOS呈负相关(r=-0.501,p<0.05);脑梗死合并高血压组ADMA水平与eNOS亦呈负相关(r=-0.717,p<0.05)。两组ADMA与NO均呈负相关,r分别为-0.484和-0.312。
     7.分别将脑梗死的传统危险因素如性别、年龄、高血压、糖尿病、吸烟、饮酒等及ADMA进行单因素分析,将p>0.05的因素进行剔除,p<0.05的因素代入多元逐步Logistic回归分析中,发现在控制其他传统缺血性脑血管病危险因素影响后,血浆ADMA水平增高仍有统计学意义(OR=1.142,p=0.002)。
     结论:在急性脑梗死患者血浆ADMA水平显著升高,血清eNOS水平明显降低,提示脑梗死患者普遍存在血管内皮功能受损。急性脑梗死伴发高血压患者血浆ADMA水平高于脑梗死正常血压组,血清eNOS水平低于脑梗死正常血压组,而且二者的变化均与高血压的程度有关,提示血浆ADMA及eNOS水平与高血压等心血管并发症明显相关。另外,ADMA的水平可能与脑梗死的梗死面积存在密切相关。ADMA与eNOS呈负相关,而eNOS作为NO合成的关键酶,其活性变化直接调节NO的生成量及其生物学效应,提示ADMA通过eNOS/NO途径影响血管内皮功能。在控制其他影响因素后,多因素分析显示ADMA可能作为脑梗死的独立危险因素,可能是预测急性中风事件发生的的危险因子,对其进行早期干预治疗有望降低缺血性脑血管病的发病率及病死率。
Purpose:Ischemic cerebrovascular disease has high morbidity and mortality both at home and abroad,damage in endothelial function of cardiovascular and cerebrovascul -ar diseases(CCD) be considered as a widespread phenomenon,with the developing of its research,the treatments are divided into improving the lack of regional blood supply gradually and protect the ischemic nerve cells,with in these the nitric oxide (NO) which be produced by vascular endothelial cells is an inportant intrinsic agent in regulate cerebral blood flow and protect nerve cells.Under physiological condition ,NO is released sustainly,L-arginine as its substrate and mainly by endothelial nitric oxide synthase(eNOS) catalytic generated.ADMA is the analogues of L-arginine, and it can compete with eNOS active site to inhibit the activity of NOS,thus will to reduce the generation of NO,resulting in endothelial dysfunction.This study through exam the levels of ADMA in plasma and NO,eNOS levels in serum about patients of who suffered with cerebral infarction combined with or not hypertension.In order to explore the pathogenesis of CCD that through ADMA induced,on the other hand,to explore the neuroprotective effect of eNOS.All of these will be benefit to cerebral infarction in clinical intervent early and drug treatment.Moreover,it will providing theoretical guidance and objective basis to cerebral infarction.
     Methods:Select fifty cases who suffered with acute cerebral infarction but normote -nsive,sixty cases of acute cerebral infarction with hypertension,and fifty cases of healthy controls,three groups of age,sex matched.Patients who presented with in one-week after the onset,and collected venous blood after fasting at least twelve hours,then examed the levels of ADMA,NO and eNOS each group.ADMA was examed by HPLC,NO was examed by nitrate reductase method,eNOS was examed by enzyme-linked ELISA method.Value to mean±standard deviation of that result, all statistical analyses were performed with the statistical software SPSS11.5.
     Results:1.Acute cerebral infarction with normal blood pressure group plasma ADMA level was(0.73±0.16μmol/L),cerebral infarction with hypertension plasma ADMA level was(1.03±0.22umol/L),the healthy control group,plasma ADMA level was 0.47±0.16umol/L,there have statistically significant difference among there groups(p<0.05).Moreover,ADMA and the level of hypertension were positive -ly correlated(p<0.01),there were non-related to age,TC,TG,smoking,drinking and other factors.
     2.Cases of infarction patients with hypertension whose eNOS level was(47.61±20.2 1U/ml),significantly lower than the normal blood pressure group which eNOS level was(55.70±18.96U/ml)(p<0.05),and both lower than the normal control group,its eNOS levels in serum(66.54±24.13U/ml)(P<0.05).
     3.NO level in Infarction combined with hypertension group was(55.28±10.78umol /L),the group cerebral infartion but normal blood pressure whose serum NO level was(60.20±14.03umol/L),there were not significant difference between the two groups(p>0.05),but were lower than NO level of the control group(70.27±6.78 umol/L),the difference has statistical significance(p<0.05).
     4.Determination of high blood pressure(HBP) classification at all levels with hypert -ension in patients with cerebral infarction inspection indicators:patients of HBP classl whose plasma ADMA level of 0.74±0.23umol/L,were significantly lower than class 2 and 3 patients(whose ADMA levels to(0.96±0.17 umol/L) and(1.05±0.11 umol/L),and between the later two groups was not significant different (p>0.05);eNOS levels among three HBP groups show:classⅠwas of(51.27±16.76 umol/L),class 2 group was 49.43±19.22umol/L,both they were higher than class 3 group(45.45±14.10 umol/L),and have significant differences(p<0.05);three groups of patients with serum NO concentrations were(53.16±11.48 umol/L), (50.87±16.03 umol/L) and(46.02±16.82 umol/L),but there were no significant differences(p>0.05).
     5.After the OCSP classification founded that level of ADMA in both TACI and PACI were higher than LACI;eNOS level in TACI and POCI were lower than LACI group; and the NO level in TACI was lower than LACI.The differences were significant.
     6.Pearson-correlation analysis showed:normal blood pressure group cerebral ADMA levels with eNOS were negative correlation(r=-0.501,p<0.05);cerebral infarction combined with hypertension group ADMA levels with eNOS were also negatively correlated(r=-0.717,p<0.05).ADMA and NO levels were negatively correlated between two groups,correlation coefficients were -0.484 and -0.312.
     7.Respectively,the traditional risk factors for cerebral infarction such as gender,age, hypertension,diabetes,smoking,drinking,etc.and ADMA to do one-factor analysis, statistic standard is p<0.05,it will be removed if p>0.05,and factors of p<0.05 were performed the multiple stepwise Logistic regression analysis found that in the control of other traditional risk factors of ischemic cerebrovascular disease,elevated plasma ADMA levels was still a independent risk factor.
     Conclusion:The levels of ADMA in plasma were higher significantly in acute cerebral infarction,but levels of eNOS in serum were lower obviously,indicated that vascular endothelial dysfunction was prevalence in cerebral infarction.There have significant difference in the levels of ADMA and eNOS which in the two groups—CI combined with hypertension and CI but normotension group,the finding suggesting that there have correlation between the hypertension with levels of ADMA and eNOS, and there were correlation with the degree of hypertension.On the other hand,based on OCSP classification,ADMA may be close correlated with cerebral infarction area. ADMA was negatively correlated with eNOS,eNOS as a key enzyme in produce NO, so the quantity and biological effects of NO will be regulated directly by eNOS,thus, we think that the influence of ADMA to vascular endothelial function through the eNOS/NO pathway.
     Controlling for other factors,the multi-factor analysis showed that ADMA may serve as an independent risk factor for cerebral infarction,it can be used as predict factor for stroke.As a result,ADMA will be as a treatment target of CI and may expe -cted to reduce its morbidity and mortality.
引文
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