内皮源一氧化氮合酶基因单核苷酸多态性与高血压病相关性研究

目的分析一氧化氮合酶基因NOS3 A-922 G、NOS3 T-786C与NOS3 G894T单核苷酸多态性(SNP)的等位基因频率分布与高血压病的相关性。方法选择无血缘关系的高血压病患者192例(高血压病组)及正常健康人122例(对照组),获取其静脉血白细胞基因组DNA。采用等位基因特异性引物聚合酶链反应技术检测NOS3NOS3 A-922G、NOS3 T-786C与NOS3 G894T 3个位点的基因型。结果高血压病组NOS3 G894T、NOS3A-922G和NOS3 T-786 C各相应的等位基因型分布频率和等位基因单倍型频率与对照组比较无显著性差异(P>0.05)。两组按男女性别分层研究,男女人群亦未发现NOS3 A-922 G、NOS3 T-786C与NOS3 G894T各个位点单核苷酸多态性与高血压病有相关性。结论我们的研究未能发现人群中NOS3A-922 G、NOS3 T-786C与NOS3 G894T SNP与其高血压病有明确的相关性,且无性别差异。     

诱导型一氧化氮合酶基因多态性与冠心病的关联性研究

目的探讨一氧化氮合酶(i NOS)基因多态性与冠心病的关联性。方法病例组为291例冠心病患者,年龄、性别匹配的健康体检者487例为对照组。采用Taqman探针荧光定量PCR技术检测rs2779248 C/T、rs1137933 C/T的基因型分布情况。结果经校正传统危险因素后,携带rs2779248 TT基因型的个体患冠心病的风险比携带CC基因型的高2.58倍(95%CI:1.01~6.67);而携带rs1137933 CT+TT基因型的个体患冠心病的风险比携带CC基因型的高1.36倍(95%CI:1.00~1.85),突变T等位基因可能增加冠心病发病风险(OR=1.36,95%CI:1.04~1.77)。各基因型间空腹血糖水平存在明显差异。结论 i NOS基因多态性与中国汉族人群冠心病发病风险相关,i NOS基因可能通过调节血糖影响冠状动脉粥样硬化斑块形成,进而增加冠心病的发病风险。     

内皮细胞型一氧化氮合酶基因多态性与血管性疾病的关系

内皮细胞型一氧化氮合酶基因是动脉粥样硬化性血管病的易感基因，该基因的多态性与颈动脉粥样硬化斑块，缺血性卒中，心血管病，高血压病以及糖尿病肾病等血管性疾病的发生和发展有一定的相关性。     

内皮细胞型一氧化氮合酶基因多态性与高血压病的相关性研究

目的　探讨内皮细胞型一氧化氮合酶 (endothelialnitricoxidesynthase ,eNOS)基因第 4内含子数目可变性串联重复序列 (variablenumberoftandemrepeatspolymorphism ,VNTR)多态性与高血压病(essentialhypertension,EH)的相关性。方法　依据VNTR位点侧翼序列设计引物 ,PCR方法分别自血压正常 (normotension ,NT)和EH人群基因组DNA扩增VNTR片段 ,琼脂糖凝胶电泳分析VNTR基因型 ,对两组VNTR的基因型与等位基因频率进行统计对比。结果　NT和EH人群eNOS基因VNTR均存在重复 4次、5次和 6次 3种等位基因 ,以及 4/4纯合、4/5杂合、5/5纯合和 5/6杂合 4种VNTR基因型 ,但等位基因与基因型的分布频率存在差异。EH人群重复 4次的等位基因频率 (χ2 =30 80 ,P <0 0 0 0 1 ) ,4/5杂合 (χ2 =2 1 45 ,P <0 0 0 0 1 )和 4/4纯合 (χ2 =4 0 6 ,P <0 0 5)的基因型频率明显高于NT人群。结论　eNOS基因VNTR重复 4次的等位基因与EH相关 ,携带重复 4次等位基因的人具有罹患EH的一定危险性 (χ2 =33 96 ,P <0 0 0 0 1 ,OR =3 2 ,95 %可信区间为 2 0 97～ 4 495)。     

内皮细胞型一氧化氮合酶基因多态性与血管性疾病的关系

内皮细胞型一氧化氮合酶基因是动脉粥样硬化性血管病的易感基因,该基因的多态性与颈动脉粥样硬化斑块、缺血性卒中、心血管病、高血压病以及糖尿病肾病等血管性疾病的发生和发展有一定的相关性。     

醛固酮、诱导型一氧化氮合酶与动脉粥样硬化

醛固酮可引起自主神经功能失调、参与高血压的发生发展、参与心血管重构、致心律失常、参与血管再狭窄以及促进血栓形成等.     

一氧化氮合酶基因多态性与冠状动脉痉挛的相关性

冠状动脉痉挛是临床许多缺血性心脏病共同的病理生理机制之一,越来越多的研究集中在冠状动脉痉挛发生的分子机制水平。一氧化氮合酶基因多态性参与了冠状动脉痉挛的发生,本文主要就与冠状动脉痉挛有关的一氧化氮合酶的基因多态性进行综述。     

一氧化氮和一氧化氮合酶基因多态性与糖尿病肾病

早期糖尿病肾病的特征改变是肾脏肥大和高滤过,一氧化氮过多一这一改变有关,而在晚期,一氧化氮合成受损,诱导型一氧化氮合酶基因上AAAT多态性与内皮一氧化氮合酶基因上27个碱基重复序列多态性与糖尿病肾病的发生与进展有关,而（CCTTT）n多态性主要与糖尿病肾病危险性降低有关。内皮一氧化氮合酶第13内含子上的多态性与高血压有关,而（27碱基）4等位基因与糖尿病肾病风险增加密切有关。     

内皮细胞型一氧化氮合酶基因多态性与糖尿病肾病的相关性研究

目的：探讨内皮细胞型一氧化氮合酶（eNOS)基因第7外显子894G→T点突变,及其第4内含子的1个27bp的插入／缺失（a/b)多态性,与2型糖尿病肾病（DN）之间的关系。方法：894G→T点突变采用聚合酶链反应限制性片段长度多态性（PCR－RFLP）技术,27bp的a/b多态性采用聚合酶链反应结合4％琼脂糖凝胶电泳分离技术。比较各组间的等位基因频率与基因型频率。结果：（1）早期糖尿病肾病组（DN^ 组）T等位基因及TG基因型频率显著高于糖尿病非肾病患者（DN^-组,P＜0．05）。（2）DN^ 组a等位基因及ab基因型频率显著高于DN^-组（P＜0．05）。（3）DN^ 组的TGab基因型频率亦显著高于DN^-组（P＜0．05）。（4）糖基化血红蛋白（GHbA1c),收缩压（SBP）,总胆固醇（TC）,eNOS基因第7外显子894G→T基因点突变及第4内含子a/b多态性均属糖尿病肾病的独立危险因素。结论：糖尿病患者eNOS基因第7外显子T等位基因及第4内含子a等位基因与DN^ 的发生密切相关,两种等位基因同时存在者,DN^ 发病风险更高。     

内皮细胞型一氧化氮合酶基因多态性与糖尿病肾病的相关性

糖尿病肾病是糖尿病 (ＤＭ )致死致残的主要原因之一。近年来流行病学调查显示 ,有些ＤＭ患者虽血糖长期控制不良 ,但并不发生ＤＮ ,而有些患者虽代谢控制良好 ,最终仍发生ＤＮ〔1,2〕,提示遗传因素在ＤＮ的发生发展中可能起关键作用。分子水平的研究发现 ,内皮细胞型一氧化氮合酶(ｅＮＯＳ)基因第 7外显子的Ｇｌｕ2 98Ａｓｐ(894Ｇ→Ｔ)基因点突变及第 4内含子一个 2 7ｂｐ的插入 /缺失 (ａ/ｂ)多态与糖尿病微血管并发症及冠心病、心肌梗死的发生有明显相关性〔1 5〕,但该点突变及多态与糖尿病肾病的相关性各家报道不一〔6,7〕,特别是该突…     

内皮型一氧化氮合酶基因G894T多态性与颈动脉粥样硬化的相关性

目的探讨天津市汉族老年人群内皮型一氧化氮合酶(eNOS)基因G894T多态性与颈动脉粥样硬化(CAS)的关联性。方法选择接受颈动脉超声检查患者427例,根据超声检查结果分为CAS组1 30例和对照组297例。采用PCR-RFLP方法分析G894T多态性基因型,同时对所有对象检验血脂等危险因素。结果 CAS组基因型GT、GT+TT和T等位基因频率明显高于对照组(P<0.05,P<0.01)。调整了年龄和性别后,基因型GT+TT与CAS的关联差异有统计学意义(OR=1.89,95%CI:1.20～2.98,P=0.007)。对其他危险因素调整后,logistic回归分析,基因型GT+TT不是CAS的独立危险因素(OR=1.43,95%CI:0.85～2.40,P=0.1 78)。在CAS组中,不同斑块类型的分布、斑块总面积和Crouse积分在T等位基因携带者与非携带者差异无统计学意义(P>0.05)。结论 eNOS基因G894T多态性的基因型GT+TT与CAS的发生相关,但不是CAS的独立危险因素,与CAS的严重程度亦无关联。     

肝癌组织中一氧化氮合酶及其基因表达的研究

目的研究肝癌组织中一氧化氮合酶(iNOS)及其基因表达与肝癌发生发展的关系。方法用免疫组化和原位杂交的方法对21例肝癌及癌旁组织中的诱导型一氯化氮合酶(iNOS)及其基因表达进行原位检测和观察。结果:NOS 阳性反应物质呈黄色或棕黄色,位于细胞浆中。非癌殖织(肉眼观距癌组织边缘>1.5)多呈阴性或弥漫弱阳性,但部分非癌组织中可见 iNOS 呈阳性的细胞呈点状分布;癌旁组织多呈阳性,提示 iNOS 表达与肝组织癌变有关。癌组织核心多呈阴性或弥漫弱阳性,但分化中和差的癌组织核心也分别有一例 NOS 呈强阳性;周边癌组织呈局灶阳性,侵入纤维组织中的弥敢癌细胞星强阳性,提示 NOS 的表达与肝癌组织的侵润能力有关。肝癌组织 iNOSmRNA 阳性细胞的分布与 iN-OS 蛋白的表达基本相似。结论 iNOS 蛋白及其基因表达与肝组织癌变及肝癌侵润能力有关。     

内皮型一氧化氮合酶基因多态性与急性心肌梗死的相关性探讨

目的　探讨内皮型一氧化氮合酶 (eNOS)基因多态性与急性心肌梗死 (AMI)的相关性。方法　依据eNOS基因外显子 7G894T位点设计引物 ,通过巢式聚合酶链反应 (PCR)扩增目的片段 ,限制性内切酶消化目的片段 ,琼脂糖凝胶电泳 ,紫外透射分析仪检测 ,计数 10 7例AMI病人及 81例健康者基因型及突变基因频率 ,通过χ2 检验有无统计学意义。结果　eNOS基因外显子 7的 894位点有 3种基因型 :GG、GT、TT。AMI组 10 7例中2 5例发生G894T突变 ,纯合子TT 9例 ,杂合子GT 16例。对照组 81例中 13例发生G894T突变 ,均为杂合子。两组等位基因纯合子突变具有非常显著统计学意义 ,x2 =5 4 2 9,P <0 0 5 ,两组等位基因总突变率 (纯合子 +杂合子 )无明显统计学意义 ,x2 =1 5 2 9,P >0 0 5。结论　eNOS基因 894位点TT型突变与AMI发病密切相关 ,是AMI发病的危险因子     

Association of nitric oxide synthase gene polymorphism with asthma: A systematic review and meta-analysis

Introduction

This study examines the associations between asthma and nitric oxide (NO) synthase (NOS) gene polymorphisms.

Methods

After a systematic literature search in electronic databases, studies were selected based on eligibility criteria. Data were extracted from research articles and were synthesized and tabulated. Where a particular polymorphism data were reported by multiple studies, meta-analyses of odds ratios were performed, or odds ratios reported by individual studies were pooled.

Results

Twenty studies (4450 asthma patients and 5306 non-asthmatic individuals) were identified. Many studies did not find any association between CCTTT repeat polymorphism in NOS2 gene and asthma. However, a study reported that pretreatment mean exhaled NO levels in asthmatics were found to be significantly higher in genotypes with higher number of CCTTT repeats. Also, alleles with <11 CCTTT repeats were associated with poor asthma treatment outcomes. A single nucleotide polymorphism, G894T, in NOS3 gene was not found to be significantly associated with asthma by at least four studies. However, a T allele at this locus was associated with lower NO levels. Also, G894T frequency was significantly higher in asthmatic children who responded to inhaled corticosteroids along with long-lasting beta2-agonists. A T allele of NOS3 786C/T polymorphism increased the probability of bronchial asthma with comorbid essential hypertension in asthma patients. Asthma severity also differed for different Ser608Leu exon 16 variants of NOS2 gene.

Conclusions

Several polymorph NOS gene variants are identified, some of which appear to have influence on asthma prevalence or outcomes. However, data are varying depending on the nature of variant, ethnicity, study design, and disease parameters.     

Inducible nitric oxide synthase and atherosclerosis

Nitric oxide (NO) synthase induction in vascular smooth muscle cells may play a role in local vascular injury associated with atherosclerosis or postangioplasty restenosis by inhibiting smooth muscle cell proliferation and contraction, as well as by preventing leukocyte and platelet adhesion. The expression of inducible NO synthase is increased in balloon-injured arteries of experimental animals or in human atherosclerotic lesions. Replacement therapy with NO donors or NO synthase gene transfer may improve the clinical course of atherosclerosis or restenosis.     

冠心病与血管紧张素转换酶和内皮型一氧化氮合酶基因多态性及交互作用的临床研究

目的联合对冠心病患者血管紧张素转换酶（ACE）基因多态性和内皮型一氧化氮合酶（eNOS）基因G894T多态性进行分析,探讨基因多态性与冠心病的关系和交互作用及遗传学机制在冠心病发病及预后中的临床意义。方法应用聚合酶链反应-限制性片段长度多态性（PCR—RFLP）分析技术检测236例冠心病患者及190例正常人ACE和eNOS两种基因多态性。同时测定血脂、血糖、体重指数（BMI）、左室射血分数（LVEF）和血压。结果冠心病组ACE基因DD型频率[36％（86／236）]显著高于对照组[19％（36／190）,P〈0．01],Ⅱ型频率[27％（64／236）]显著低于对照组[49％（93／190）,P〈0．05]。冠心病组DD型甘油三酯（TG）[（2．2±1．7）mmol／L]显著高于Ⅱ型TG[（1．6±0．8）mmol／L和ID型TG[（1．7±0．9）mmol／L,均P〈0．05],DD型高密度脂蛋白胆固醇[HDL—C（1．2±0．4）mmol／L]显著低于Ⅱ型HDL—C[（1．3±0．3）mmol／L,P〈0．05],DD型血糖[（6．2±1．7）mmol／L]和BMI[（25．7±2．8）kg／m^2]显著高于ID型[血糖：（5．6±1．3）mmol／L,BMI：（24．8±3．1）kg／m^2。,P〈0．05],DD型LVEF（56％±14％）显著低于Ⅱ型LVEF（62％±15％）和ID型LVEF（61％±14％）,均P〈0．05。收缩压、舒张压、总胆固醇（TC）、低密度脂蛋白胆固醇（LDL—C）、糖尿病组与非糖尿病组、急性冠状动脉综合征组与非急性冠状动脉综合征组、单支病变组与多支病变组在ACE和eNOS基因不同基因型之间差异均无统计学意义。冠心病组eNOS基因GT型频率[28％（67／236）]显著高于对照组[17％（32／190）,P〈0．01],GG型频率与对照组比较,差异无统计学意义。TG、HDL—C、血糖、BMI和LVEF在eNOS基因不同基因型之间差异均无统计学意义（均P〉0．05）。携带DD型患冠心病的概率是携带Ⅱ型的1．74倍（P〈0．01）,携带GT型患冠心病的概率是携带GG型的1．73倍（P〈0．05）。两种基因对患冠心病的交互作用显示为如同时携带Ⅱ型和GG型,患冠心病的概率是37．9％,而同时携带DD型和GT型患冠心病的概率是77．8％。结论ACE基因多态性和eNOS基因多态性与冠心病及某些危险因素显著相关,同时携带DD型和GT型两种易患基因型时,患冠心病的概率明显增加,具有显著的遗传倾向。     

Bleeding duodenal ulcer and association with polymorphism of endothelial constitutive nitric oxide synthase gene

Nitric oxide (NO) exerts both protective and proinflammatory actions in the gastrointestinal tract. Enhanced gastric NO synthase (NOS) activity has been shown in duodenal ulcer patients. Recently, intron-4 polymorphism of the endothelial constitutive (ec) NOS gene has been associated with some pathological conditions. Our aim was to determine the genotype and allele frequencies of the ecNOS4 polymorphism in peptic ulcer patients. The distribution of the polymorphism ecNOS4a/b was studied in 188 ulcer patients and 120 healthy controls, from genomic DNA. Genotypes ab, bb, and aa and allele frequency were similar in both peptic ulcer patients and controls, and no differences were found when patients and controls were analyzed according to the presence of several etiological factors. However, alelle a carrier status was associated with decreased risk of bleeding in duodenal ulcer patients (OR = 0.49; 95% CI = 0.25–0.95; P = 0.03). In conclusion, this ecNOS4 polymorphism gene could be related to susceptibility of duodenal ulcer patients to bleeding.     

Role of neuronal nitric oxide synthase and inducible nitric oxide synthase in intestinal injury in neonatal rats

AIM: To investigate the dynamic change and role of neuronal nitric oxide synthase (nNOS) and inducible nitric oxide synthase (iNOS) in neonatal rat with intestinal injury and to define whether necrotizing enterocolitis (NEC) is associated with the levels of nitric oxide synthase (NOS) in the mucosa of the affected intestine tissue. METHODS: Wistar rats less than 24 h in age received an intraperitoneal injection with 5 mg/kg lipopolysaccharide (IPS). Ileum tissues were collected at 1, 3, 6, 12 and 24 h following LPS challenge for histological evaluation of NEC and for measurements of nNOS and iNOS. The correlation between the degree of intestinal injury and levels of NOS was determined. RESULTS: The LPS-injected pups showed a significant increase in injury scores versus the control. The expression of nNOS protein and mRNA was diminished after LPS injection. There was a negative significant correlation between the nNOS protein and the grade of median intestinal injury within 24 h. The expression of iNOS protein and mRNA was significantly increased in the peak of intestinal injury. CONCLUSION: nNOS and iNOS play different roles in LPS-induced intestinal injury. Caution should be exerted concerning potential therapeutic uses of NOS inhibitors in NEC.