高血压病患者血压晨峰与心血管重构的关系

目的: 观察高血压病患者血压晨峰（morning blood pressure surge,MBPS）与心脏肥大和颈动脉内膜-中膜厚度(IMT)的关系。方法: 高血压病患者386例。根据动态血压检测结果,分为晨峰组（146例）和非晨峰组（240例）,全部病例同步记录24 h动态血压和动态心电图,观察指标为24 h动态血压参数;超声技术检测左室质量指数（LVMI）、左房内径（LAD）、颈动脉IMT等指标。结果: 晨峰组与非晨峰组比较:LVMI分别为（119±21）g/m2和（92±12）g/m2(P<0.01) ;LAD分别为（46±11）mm与（38±10）mm（P<0.05）;颈动脉IMT分别为（1.36±0.24）mm与（0.92±0.18）mm（P<0.01）;左室肥厚(LVH)的检出率分别为67%与30%（P<0.01）。结论: 与无血压晨峰的高血压病患者比,具有血压晨峰的高血压病患者LVH和颈动脉硬化更显著,心血管重构更显著,左心房内径更大。     

Association of single nucleotide polymorphisms in klotho with priapism in sickle cell anaemia

The complications of sickle cell disease are probably determined by genes whose products modify the pathophysiology initiated by the sickle haemoglobin mutation. Priapism, one vaso-occlusive manifestation of sickle cell disease, affects more than 30% of males with the disease. We examined the possible association of single nucleotide polymorphisms (SNPs) in 44 candidate genes of different functional classes for an association with the occurrence of priapism. One hundred and forty-eight patients with sickle cell anaemia and incident or a confirmed history of priapism were studied, along with 529 controls that had not developed priapism. Polymorphisms in the KLOTHO gene (KL; 13q12) showed an association with priapism by genotypic [reference SNP cluster identifier number (rs)2249358; odds ratio (OR) = 2.6 (1.4-5.5); rs211239; OR = 1.7 (1.2-2.6)] and haplotype analyses [rs211234 and rs211239; OR = 2.3 (1.5-3.4)]. These findings may have broader implications in sickle cell disease, as KL encodes a membrane protein that regulates many vascular functions, including vascular endothelial growth factor expression and endothelial nitric oxide release.     

Prevalence and factors associated with left ventricular remodeling in renal artery stenosis

The objective of this study is to evaluate the prevalence, geometric patterns, and factors associated with left ventricular remodeling in patients with renal artery stenosis (RAS). Demographic, clinical, and echocardiographic data were assessed in 77 patients with RAS prior to endovascular stenting. The left ventricular mass index (LVMI) and relative wall thickness were calculated using American Society of Echocardiography (ASE) recommendations. Patients were classified based on LVMI and relative wall thickness into four ventricular remodeling patterns: normal geometry, concentric remodeling (CR), concentric hypertrophy (CH), and eccentric hypertrophy (EH). Logistic regression was done to investigate the determinants of the different ventricular remodeling patterns. Mean LVMI and relative wall thickness were 118 ± 40 g/m² and 0.45 ± 0.1. Left ventricular hypertrophy was observed in 65%. CH was the most prevalent geometric pattern of remodeling (normal, 16.9%; CR, 18.2%; CH, 40%; EH, 24.6%). Thirty (39%) patients had an abnormal LV systolic function (ejection fraction <55%), with 14 (46%) of them having eccentric hypertrophy. Independent predictor of EH was glomerular filtration rate (odds ratio [OR], 0.943; confidence interval [CI], 0.899–0.989; P = .01). Systolic elevation of blood pressure (OR, 1.030; CI, 1.003–1.058; P = .03) was associated with CH, and elevated diastolic blood pressure was associated with CR (OR, 0.927; CI, 0.867–0.992; P = .02). Patients with RAS have a high prevalence of left ventricular remodeling and LVH. Even though CH was the most prevalent pattern of left ventricular remodeling, EH was commonplace and was associated with renal dysfunction and heart failure.     

磷酸二酯酶4D基因单核苷酸多态性与COPD相关性研究

目的 探讨磷酸二酯酶4D (PDE4D)基因单核苷酸多态性(SNP)与COPD相关性.方法 选取8个SNP位点SNP1=rs11740402,SNP2=rs17528473,SNP3=rs17780213,SNP4=rs1529843,SNP5=rs11743928,SNP6=rs26956,SNP7=rs35387,SNP8=rs35386,以北京某社区40～80岁人群为研究对象,共入选136例受试者,COPD组71例和对照组65例,均为汉族.设计目标SNP位点上下游引物,PCR扩增目标片段,Sanger测序法检测目标片段碱基,x2检验比较2组在等位基因和基因型分布频率上的差异,非条件Logistic回归评价SNP位点与COPD之间的相关性.结果 8个SNP位点其基因型分布在COPD组和对照组均符合Hardy-Weinberg平衡,在对照组受试者连锁不平衡(Linkage Disequilibrium,LD)分析时发现SNP1、SNP2处于连锁不平衡,形成LDBlock1,SNP6、SNP7和SNP8处于连锁不平衡,形成LD Block2,SNP5基因型均为A/A型,不能与其他SNP位点形成LD Block.单倍体型分析发现在COPD组和对照组中差异无统计学意义(P＞0.05).基于等位基因的关联分析中发现2组病例之间差异无统计学意义(P＞0.05),在基因型的关联分析中发现位点SNP8基因型频率在COPD组和对照组差异有统计学意义(P＜0.05),在进一步非条件Logistic回归分析中发现SNP8在Ressessive遗传模型时与COPD存在相关性,G/G基因型在COPD组和对照组分别为20.3％和6.3％(P＜0.05,OR =4.07,95％ CI为1.26～13.18),提示SNP8的G/G基因型与COPD易感性增加有关.结论 研究结果提示PDE4D基因SNP可能与COPD的发生发展相关,SNP8的G/G基因型可能是COPD易感性的一个预测因子.     

Association of carotid atherosclerosis with genetic polymorphisms of the klotho gene in patients with hypertension

Aim: Previous studies suggest that klotho gene polymorphisms may be associated with atherosclerosis, but did not assess the relationship between klotho gene polymorphisms and atherosclerosis parameters such as carotid artery intima‐media thickness (IMT). Here, we studied whether klotho single nucleotide polymorphisms (SNP) were associated with carotid atherosclerosis. Methods: All subjects were Japanese. Eight‐hundred and fifty‐three patients with hypertension (465 men and 388 women) in the outpatient clinic and 1783 subjects from the general population (821 men and 962 women) attending health check‐ups were analyzed in the present study. We measured mean IMT of the common carotid artery to evaluate carotid atherosclerosis. Four single nucleotide polymorphisms (SNP) (rs7323281; intron1, rs5644481; exon4, rs3752472; exon3, rs650439; intron4) of klotho were selected as representative SNP in haplotype blocks. Results: Multivariate logistic regression analysis adjusted by confounding factors showed a significant association of rs650439 with carotid atherosclerosis in hypertensive patients (TT vs TA vs AA, P < 0.01; TT + TA vs AA, P < 0.01). By ancova considering confounding factors, rs650439 was also significantly associated with mean IMT (TT + TA vs AA, P = 0.04) in the hypertensive population. However, there was no significant association between klotho SNP and carotid IMT in the general population. Compared to the general population, the subject group with hypertensive patients clearly had more atherosclerosis risk factors. Conclusion: Only in hypertensive patients was klotho rs650439 strongly associated with mean IMT thickening of the common carotid artery. Therefore, klotho SNP (rs650439) may influence on the progression of carotid atherosclerosis in patients with hypertension. Geriatr Gerontol Int 2010 ; 10: 311–318.     

Irbesartan reduces common carotid artery intima-media thickness in hypertensive patients when compared with atenolol: the Swedish Irbesartan Left Ventricular Hypertrophy Investigation versus Atenolol (SILVHIA) study

BACKGROUND AND PURPOSE: Angiotensin II promotes cell growth and has been implicated in the development and maintenance of left ventricular (LV) hypertrophy and of structural vascular changes. We wished to examine whether an angiotensin receptor blocker (ARB) would influence structural vascular changes beyond the effects of blood pressure reduction. METHODS: Hypertensive patients with LV hypertrophy (age 55 +/- 9 years, blood pressure 162 +/- 19/104 +/- 8 mmHg, LV mass index 148 +/- 31 g m(-2); mean +/- SD) were randomized double-blind to the ARB irbesartan (n=52) or the beta(1) receptor blocker atenolol (n=56) for 48 weeks. Ultrasonography of the left and right common carotid artery (CCA) and echocardiography were performed at week 0 and 48. RESULTS: With similar reductions in blood pressure, CCA intima-media thickness (IMT) was reduced by irbesartan (from 0.92 +/- 0.14 by 0.01 +/- 0.10 mm, NS), whereas it was increased by atenolol (from 0.94 +/- 0.21 by 0.03 +/- 0.12 mm, P=0.018; P=0.002 between groups). CCA lumen diameter was less reduced by irbesartan than by atenolol. Thus, CCA intima-media area was reduced by irbesartan (from 21.3 +/- 5.0 by 0.90 +/- 2.45 mm(2), P=0.034) but not by atenolol (from 21.3 +/- 6.1 by 0.18 +/- 2.71 mm(2), NS; P=0.037 between groups). Changes in CCA IMT or area did not relate to changes in LV mass. CONCLUSIONS: The favourable effects by irbesartan on CCA IMT with an outward vascular remodelling suggest that angiotensin II mediates structural vascular changes, beyond the effects of blood pressure. This may be important in the prevention of cerebrovascular events.     

Left ventricular myocardial remodeling and contractile state in chronic aortic regurgitation

BACKGROUND: In chronic aortic regurgitation, eccentric hypertrophy, with combined concentric hypertrophy of the left ventricle, is an important adaptive response to volume overload, which in itself is a compensatory mechanism for permitting the ventricle to normalize its afterload and to maintain normal ejection performance (physiologic hypertrophy). However, progressive dilatation of the left ventricle leads to depressed left ventricular (LV) contractility and myocardial structural changes, including cellular hypertrophy and interstitial fibrosis (pathological hypertrophy). HYPOTHESIS: The study was undertaken to determine the relationship between left ventricular myocardial structure and contractile function in 14 patients with chronic aortic regurgitation by cardiac catheterization and endomyocardial biopsies. METHODS: Myocardial cell diameter and percent interstitial fibrosis were obtained from biopsy samples. Contractile function was evaluated from the ratio of end-systolic wall stress to end-systolic volume index (ESS/ESVI) and the ejection fraction-end-systolic stress (EF-ESS) relationship, which was obtained from 30 normal control subjects. RESULTS: Myocardial cell diameter correlated significantly with the ESVI (r = 0.72, p < 0.005), ejection fraction (r = -0.58, p < 0.05), and ESS/ESVI (r = -0.58, p < 0.05). The percent interstitial fibrosis also correlated inversely with ESS/ESVI (r = -0.71, p < 0.005). Compared with very few patients with an ESVI < 70 ml/m2, the majority of patients with ESVI > or = 70 ml/m2 had a cell diameter of > or = 30 microns and a percent interstitial fibrosis of > or = 10%. The nine patients who had depressed contractile function, as assessed from the EF-ESS relationship, had a higher percent interstitial fibrosis (p < 0.05) than five patients showing a normal EF-ESS relationship, despite the fact that there was no significant difference in myocardial cell diameter between them. Thus, advanced cellular hypertrophy and excessive interstitial fibrosis were significantly and independently associated with myocardial contractile dysfunction and appeared to be responsible for ventricular remodeling. CONCLUSION: Our findings suggest that in many patients with aortic regurgitation, eccentric hypertrophy changes its nature from physiologic to nonphysiologic during the earlier stages in the course of the disease rather than during the stage described previously.     

晚期NSCLC患者放疗效果与XRCC1 SNP的关系

目的评价晚期非小细胞肺癌(NSCLC)患者放射性治疗疗效及副作用与XRCC1 Codon399单核苷酸多态性的相关性。方法经皮肺穿刺活检病理确诊为鳞癌、腺癌、腺鳞癌或大细胞癌患者60例,以xTAG液相芯片技术检测XRCC1 Codon399的3种基因型。随访至放疗结束后3个月,评价放疗效果和放射性损伤与不同基因型的关系。结果各组在放疗效果方面未发现显著差异。Arg/Gln杂合子组患者发生急性放射性肺损伤的比例高于两组纯合子(P0.05),Arg/Gln和Gln/Gln组患者在消化道损伤方面要高于Arg/Arg纯合子组(P0.05)。在皮肤、食管损伤以及白细胞、血小板等指标未发现显著差异(P0.05)。结论XRCC1 Codon399单核苷酸多态性与NSCLC放疗敏感性无关,但与晚期NSCLC患者肺部及消化道的急性放射性损伤有关,有望成为放射治疗副作用的预测因子之一。     

Effects of late coronary artery reperfusion on left ventricular remodeling persist for 10 weeks after experimental rat myocardial infarction and are associated with improved survival

Objective: To test the hypothesis that coronary artery reperfusion performed too late to reduce infarct size improves survival by altering left ventricular remodeling and preventing progressive left ventricular dilation.Background: Several clinical trials have suggested that late coronary artery reperfusion without infarct size reduction is associated with a survival benefit. Although the mechanism is not known, survival benefits could be related to decreased infarct expansion associated with late coronary artery reperfusion. Decreased infarct expansion results in decreased left ventricular volume, and the resulting decreased wall stress could prevent or attenuate progressive left ventricular dilation and improve survival.Methods: Rats (n=84) were randomized to undergo sham operation, permanent left coronary artery ligation, or 2 hours of left coronary artery ligation followed by reperfusion. Ten weeks later, hemodynamic measurements were made before and after volume loading. The rats were killed, the hearts were removed, and passive pressurevolume curves were obtained. The hearts were fixed at a constant pressure and analyzed morphometrically.Results: When examined 10 weeks after experimental myocardial infarction, late reperfusion's effects on left ventricular remodeling resulted in reduced left ventricular volume when compared to hearts with infarcts supplied by a permanently occluded coronary artery (1.9 ± 0.1 ml/kg vs. 2.1 ± 0.2 ml/ kg; p < 0.01). Although there was a trend toward less thinning (0.95 ± 0.13 mm vs. 1.00 ± 0.10 mm; p=NS) and less expansion (2.3 ± 0.4 vs. 2.8 ± 0.9; p=NS) in reperfused hearts compared to hearts with a permanently occluded coronary artery, changes in infarct shape 10 weeks after infarction were not significantly different. Reperfusion's beneficial effects on remodeling of noninfarcted myocardium were associated with improved survival. Mortality was higher in the permanently occluded rats than in the reperfused rats (35% vs. 12%; p < 0.05).Conclusion: Late coronary artery reperfusion has a beneficial effect on remodeling of noninfarcted myocardium that results in reduced left ventricular volume in rat hearts examined 10 weeks after infarction. These beneficial effects on left ventricular remodeling are associated with improved survival.     

胰腺癌细胞DPYD、MTHFR基因单核苷酸多态性分析

目的检测胰腺癌（PC）细胞株中两种代谢相关基因的单核苷酸多态性（SNPs）,为临床预测氟尿嘧啶类药物的疗效及毒副反应提供参考依据。方法培养PANC-1、CFPAC、SW1990三株PC细胞,采用QIAamp DNABlood Minikit试剂盒提取基因组DNA,用基质辅助激光解吸电离飞行时间质谱技术行二氢嘧啶脱氢酶基因（DPYD）rs1801159、rs1801160、rs17376848,亚甲基四氢叶酸还原酶（MTHFR）基因rs2274976、rs1801131、rs1801133的SNPs位点检测。结果三种PC细胞株的DPYD基因rs1801159位点基因型均为A/A纯合子,rs1801160位点基因型均为G/G。CFPAC细胞株DPYD基因的rs17376848位点基因型为A/G,PANC-1、SW1990细胞株的rs17376848位点基因型为A/A纯合子。PANC-1、CFPAC细胞MTHFR基因的rs1801131位点基因型为A/C杂合子,rs1801133位点基因型为C/C;SW1990细胞株MTHFR基因的rs1801131位点基因型为A/A纯合子,rs1801133位点基因型为T/T纯合子;三株细胞MTHFR基因的rs2274976基因型位点均为G/G纯合子。结论本实验所测三株PC细胞的DPYD基因rs1801159、rs1801160位点、MTHFR基因rs2274976位点基因型相同,其余各位点基因型均不完全相同。     

老年高血压左心室肥厚患者左心室重构和冠状动脉病变分析

目的老年高血压左心室肥厚(left ventricular hypertrophy,LVH)患者左心室重构和冠状动脉病变发生及严重程度分析。方法选择高血压患者553例,根据年龄以及是否合并LVH,分为非老年非LVH组(A组,1 41例),非老年LVH组(B组,86例),老年非LVH组(C组,196例),老年LVH组(D组,130例),比较各组危险因素伴发情况、生化指标、冠心病发生、冠状动脉病变严重程度及心脏超声结果。结果与A组比较,其余3组的冠状动脉造影阳性率明显升高;B组和D组高血压3级比例、冠状动脉3支病变率明显升高(P<0.05,P<0.01);C组和D组的二尖瓣舒张早期血流峰值速度和舒张晚期血流峰值速度的比值明显降低;B组和D组的左心房内径、左心室舒张末内径、左心室收缩末内径、左心室重量指数明显增加,LVEF明显降低(P<0.01)。C组心脏超声指标较D组变化明显,差异有统计学意义(P<0.01)。结论老年高血压LVH患者高血压病程长,高血压程度严重,冠状动脉狭窄发生率高且病变程度更严重,心脏收缩与舒张功能显著降低。     

中国汉族人群APOA5-1131 T/C基因单核苷酸多态性与冠心病的相关性

目的探讨APOA5-1131 T/C单核苷酸多态性与冠心病相关性。方法对经冠状动脉造影的冠心病组168例和对照组160例,采用聚合酶链反应—限制性片段长度多态性（PCR-RFLP）方法检测APOA5-1131 T/C单核苷酸多态性,分析不同基因型与冠心病的关系。结果APOA5-1131 C等位基因频率在冠心病组明显高于对照组（P〈0.01）。相对于T/T基因型,C/C基因型修正后的OR值为2.45,P=0.01;T/C＋C/C基因型的修正后OR值为1.72,P=0.02。结论APOA5-1131 T/C单核苷酸多态性和冠心病的发病密切相关。C/C基因型很可能是冠心病的易感基因型。APOA5-1131 T/C多态性C等位基因可能是中国人群冠心病发病的危险因素之一。     

Nurse-recorded clinic and ambulatory blood pressures correlate equally well with left ventricular mass and carotid intima-media thickness

OBJECTIVE: To assess relationships between noninvasive ambulatory blood pressure (BP), clinic BP (mean value of three readings in the seated position measured by nurses), structural cardiac indices, intima-media thickness of the common carotid artery and several hormones. DESIGN: Cross-sectional study of 75 subjects with hypertension and left ventricular hypertrophy (HTH) according to echocardiography, 35 subjects with hypertension and normal left ventricular dimensions (HT) and 23 normotensive subjects (NT). RESULTS: We found an excellent correlation between mean 24-h ambulatory BP and clinic BP, the r-value for systolic BP being 0.82 and for diastolic levels 0.78 (both P < 0.0001). Clinic and ambulatory BP correlated equally well with left ventricular (LV) mass index (r-values between 0.55 and 0.64, all P < 0.0001) and to intima-media thickness of the carotid artery (r = 0.18-0.34, P < 0.01). The systolic white-coat effect (clinic BP - day-time BP) was higher in the HTH and HT compared with NT and was weakly correlated to LV mass index (r = 0.18, P = 0.04). Nondippers (mean arterial night/day BP ratio of > 0.9) had higher brain (6.1 +/- 7.5 pmol L(-1) vs. 3.7 +/- 3.2 pmol L(-1), P = 0.01) and atrial (14 +/- 3.4 pmol L(-1) vs. 9.3 +/- 5.4 pmol L(-1), P = 0.04) natriuretic peptide levels, and also exhibited a lower ejection fraction (49 +/- 8% vs. 57 +/- 9%, P = 0.006), than dippers. CONCLUSION: Clinic BP recordings performed by nurses as three measurements 1 min apart provide excellent relationship to target organ damage. Nondippers exhibited signs of a more advanced hypertensive organ damage than dippers which corresponds well with the poor prognosis linked to this condition.     

Relation of circulating interleukin-6 to left ventricular remodeling in patients with reperfused anterior myocardial infarction

BACKGROUND: During the remodeling process after myocardial infarction (MI), the expression of proinflammatory cytokines is enhanced in the myocardium. However, only a few clinical studies have been conducted on cytokine involvement in left ventricular (LV) remodeling after MI. HYPOTHESIS: Circulating proinflammatory cytokines may be involved in LV remodeling in patients with reperfused MI. METHODS: We studied 25 patients with acute anterior MI who had undergone coronary reperfusion therapy, and 10 normal control subjects with no cardiac disease. In all patients, LV ejection fraction, end-diastolic volume index (EDVI), and end-systolic volume index (ESVI) were determined using left ventriculography at the acute phase and 6 months after onset. The delta EDVI and delta ESVI were calculated as the value of LV volume reduction, suggesting LV reverse remodeling. Serum levels of interleukin (IL)-6 and tumor necrosis factor (TNF)-alpha were measured using enzyme-linked immunosorbent assay. RESULTS: Serum levels of IL-6 and TNF-alpha at the acute phase were significantly higher in patients with MI than in control subjects (both p < 0.05). The IL-6 levels correlated well negatively with delta EDVI (r = 0.779, p = 0.039), whereas no correlation was found for TNF-alpha. According to multivariate analysis, IL-6 at the acute phase was a significant independent predictor for LV remodeling after reperfused MI (p = 0.007). CONCLUSIONS: Circulating IL-6 levels correlated closely with LV geometric changes during the remodeling process in patients with reperfused MI. Our study addresses the usefulness of another marker for LV remodeling after MI.     

脂联素基因单核苷酸多态性与急性心肌梗死的相关性研究

目的研究脂联素基因单核苷酸多态性（SNP）与急性心肌梗死（AMI）的相关关系。方法采用聚合酶链反应-限制性片段长度多态法（PCR-RFLP）检测78例AMI患者和84例健康正常对照者脂联素基因外显子2 SNP＋45和内含子3 SNP＋276基因型,分别比较2组基因型分布和等位基因频率。结果 AMI组中脂联素基因SNP＋276为GT基因型者明显高于对照组（P〈0.05）,而等位基因频率未见显著性差异;脂联素基因SNP＋45基因型分布和等位基因频率2组间未见显著性差异。AMI组中脂联素基因SNP＋276为GG＋GT基因型者血糖浓度显著高于TT基因型者（P〈0.05）;AMI组脂联素基因SNP＋45为GG基因型者胆固醇浓度高于TT和TG基因型者（P〈0.05）。结论脂联素基因SNP＋276与AMI有相关关系,GT基因型者具有急性心肌梗死高易感性;脂联素基因外显子SNP＋45和内含子SNP＋276基因多态性可能分别与AMI高危因素胆固醇和血糖浓度有关。     

Cross-sectional study of the association of 5 single nucleotide polymorphisms with enalapril treatment response among South African adults with hypertension

This study investigates the association of 5 single nucleotide polymorphisms (SNPs) in selected genes (ABO, VEGFA, BDKRB2, NOS3, and ADRB2) with blood pressure (BP) response to enalapril. The study further assessed genetic interactions that exist within these genes and their implications in enalapril treatment response among South African adults with hypertension.A total of 284 participants belonging to the Nguni tribe of South Africa on continuous treatment for hypertension were recruited. Five SNPs in enalapril pharmacogenes were selected and genotyped using MassArray. Uncontrolled hypertension was defined as BP ≥140/90 mm Hg. The association between genotypes, alleles, and BP response to treatment was determined by fitting multivariate logistic regression model analysis, and genetic interactions between SNPs were assessed by multifactor dimensionality reduction.Majority of the study participants were female (75.00%), Xhosa (78.87%), and had uncontrolled hypertension (69.37%). All 5 SNPs were exclusively detected among Swati and Zulu participants. In the multivariate (adjusted) logistic model analysis, ADRB2 rs1042714 GC (adjusted odds ratio [AOR] = 2.31; 95% confidence interval [CI] 1.02–5.23; P = .044) and BDKRB2 rs1799722 CT (AOR = 2.74; 95% CI 1.19–6.28; P = .017) were independently associated with controlled hypertension in response to enalapril. While the C allele of VEGFA rs699947 (AOR = 0.37; 95% CI 0.15–0.94; P = .037) was significantly associated with uncontrolled hypertension. A significant interaction between rs699947, rs495828, and rs2070744 (cross-validation consistency = 10/10; P = .0005) in response to enalapril was observed.We confirmed the association of rs1042714 (ADRB2) and rs1799722 (BDKRB2) with controlled hypertension and established an interaction between rs699947 (VEGFA), rs495828 (ABO), and rs2070744 (NOS3) with BP response to enalapril. Our findings have provided substantial evidence for the use of SNPs as predictors for enalapril response among South Africans adults with hypertension.     

基质金属蛋白酶-3基因单核苷酸多态性与冠状动脉粥样硬化程度的关联研究

目的 探讨MMP-3基因单核苷酸多态性(SNP)与冠心病患者冠状动脉粥样硬化程度间的相关性.方法 入选经冠状动脉造影证实的汉族冠心病患者1371例及健康对照695例,选择MMP-3-1612 5A/6A、-376C/G、Glu45Lys等SNPs位点,采用聚合酶链式反应-限制性内切酶片段长度多态性(PCR-RFLP)方法确定基因型.X2检验用于单因素分析时检验SNP位点与冠状动脉粥样硬化程度间的关联.结果 (1)-1612 5A/6A多态性位点在冠心病患者单支病变、双支病变、三支病变组中5A等位基因频率分别是0.185,0.183,0.152;-376C/G多态性位点在以上三组中-376G等位基因频率分别是0.329,0.326,0.325;Glu45Lys多态性位点在以上三组中45Lys等位基因频率分别是0.423,0.417,0.405.(2)-1612 5A/6A多态性位点5A等位基因频率在三支病变组中明显低于单支病变组(OR=0.74,P=0.04);相对于6A/6A基因型,含有5A等位基因的纯合子及杂合子频率在三支病变组明显低于单支病变组(OR=0.74,P=0.04).结论 中国汉族冠心病患者中MMP-3基因-1612 5A/6A多态性位点可能与冠心病患者冠状动脉粥样硬化程度相关,5A等位基因可能对冠状动脉粥样硬化的进展有保护作用.