内皮素1 Lys198AsnT等位基因与冠心病关系的研究

目的 探讨内皮素1（ET-1）Lys198Asn （G198T）基因多态性与汉族人群冠心病的关系.方法 对160例冠心病（CHD）患者和健康对照者80名进行研究.应用ELISA试剂盒检测血清ET-1水平;用聚合酶链反应-引物特异性片断长度多态性（PCR-SSP）方法检测Lys198Asn 基因型,采用非条件多元逐步Logistic回归模型控制混杂因素.结果 冠心病组G198T GT＋TT基因型频率（19.375%）显著高于对照组（5.000%）,差异有统计学意义（χ2＝8.847,P＜0.05）,基因型频率的相对风险分析,GT＋TT基因型患冠心病的风险是GG基因型的4.566倍（OR＝4.566,95%CI：1.68,12.40）;两组等位基因频率差异也有统计学意义χ2＝9.659,P＜0.05,OR＝4.6364,95%CI：1.953～8.052）.冠心病组血清ET-1水平[（27.8±7.3）ng/L]高于对照组[（12.5±8.1）ng/L],差异有统计学意义（P＜0.01）;冠心病组GT＋TT基因型携带者的血清ET-1水平[（33.3±7.9）ng/L]显著高于同组GG基因型者[（24.2±7.5）ng/L,P＜0.01].经Logistic回归分析冠心病的危险因素显示,G198T基因多态性（T等位基因）为冠心病的独立危险因素.结论 ET-1基因Lys198Asn多态性与冠心病的发病具有相关关系,T等位基因可能是冠心病的易感性标志.     

吸烟者内皮素-1基因Lys198Asn多态性与冠心病关系的研究

目的探讨吸烟者内皮素-1(ET-1)基因Lys198Asn(G198T)多态性与中国汉族人群冠心病(CHD)的关系。方法将213例吸烟者和192例非吸烟者分为CHD组(198例)和对照组(207例),应用聚合酶链反应-单链构象多态性方法(PCR-SSCP)检测ET-1基因G198T多态性。按吸烟与否分析G198T多态性与CHD的关系。结果当ET-1基因G198T基因型为GG时,吸烟者的调整OR=2.35(95%CI:2.15–6.83,P=0.00);基因型为GT+TT时,不吸烟者的OR=2.05(95%CI:0.98-6.97,P=0.00),吸烟者的OR=5.65(95%CI:2.87–7.65,P=0.03);吸烟者的GT+TT型更可能患冠心病,风险是GG基因型的5.65倍(OR=5.65,95%CI:2.87–7.65,P=0.03)。结论吸烟者ET-1基因G198T多态性与中国汉族人群CHD的发病具有相关性,T等位基因可能是CHD的易感性标志。     

内皮素-1基因多态性与海南汉族人原发性高血压的相关性

目的研究内皮素(ET)-1基因K198N、G8002A、+138A/-多态性与海南汉族人群原发性高血压(EH)的相关性。方法采用引物特异性片段长度多态性(PCR-SSP)方法分别检测201名海南籍汉族EH患者及311名海南籍汉族血压正常者ET1基因的+138A/-,K198N,G8002A位点多态性,基因频率采用基因计数法计算。结果海南籍汉族EH组+138A/-位点3A3A基因型的分布频率明显高于正常对照组(P<0.001),EH组3A(+138A/-)分布频率高于正常对照组(70.6 vs 62.2)(P=0.006)。海南籍汉族EH组K198N位点的GG基因型分布频率明显高于正常对照组(50.7%vs 31.8%)(P<0.001)。EH组K198N等位基因G分布频率明显高于正常对照组(74.1%vs 60.1%)(P=0.006)。结论 ET-1基因+138A/-位点的3A3A基因型和3A等位基因、K198N位点的GG基因型和G等位基因与海南汉族人EH相关,3A3A基因型、GG基因型可能是EH发生的危险因素。     

内皮素-2基因多态性与老年原发性高血压发生及非洛地平降压作用的关系

目的探讨内皮素-2基因多态性与老年原发性高血压及降压治疗效果的关系。方法汉族老年原发性高血压患者200例作为高血压组,健康体检老年人200例作为对照组。高血压患者给予非洛地平(5 mg,1次/d)口服治疗2个月。采用基因芯片技术测定内皮素-2基因A985G位点基因型。结果高血压组和对照组内皮素-2基因A985G位点基因型比较差异有统计学意义(P0.05),高血压组GG基因型高于对照组(P0.05),AA基因型和AG基因型低于对照组(P0.05)。高血压组和对照组内皮素-2基因A985G位点等位基因频率比较差异有统计学意义(P0.05),高血压组G等位基因频率高于对照组,A等位基因频率低于对照组(P0.05)。高血压组高血压家族史比例高于对照组(P0.05),体重指数、总胆固醇和三酰甘油水平均高于对照组(P0.05)。高血压患者治疗后收缩压和舒张压均明显低于治疗前(P0.05),GG基因型收缩压和舒张压下降值高于AA基因型和AG基因型(P0.05),AG基因型收缩压和舒张压下降值高于AA基因型(P0.05)。结论内皮素-2基因A985G位点基因多态性和老年原发性高血压的发病有关,应用非洛地平降压治疗后,GG基因型的降压效果更好。     

ET-1基因多态性与海南黎族人原发性高血压的相关性

目的研究内皮素1(ET-1)基因K198N、G8002A、+138A/-多态性与海南黎族人群原发性高血压(EH)的相关性。方法采用引物特异性片段长度多态性(PCR-SSP)方法分别检测98名海南籍黎族EH患者及244名海南籍黎族血压正常者组的ET1基因的+138A/-,K198N,G8002A位点多态性,基因频率采用基因计数法计算。研究对象与Hardy-Weinberg平衡的符合程度及组间基因型与等位基因频率比较均用χ2检验。以上统计学处理均采用SPSS16.0软件进行分析。结果海南籍黎族EH组+138A/-位点的4A3A基因型分布频率明显高于正常对照组(53.1 vs37.3)(P<0.001),高血压组中4A(+138/-)等位基因分布频率显著高于正常对照组(28.6 vs 15.78)(P=0.003)。海南籍黎族EH组K198N位点的GT基因型分布频率明显高于在正常对照组(53.1%vs37.3%)(χ2=6.595,P<0.05)。EH组G8002A位点的A等位基因分布频率明显高于正常对照组(34.7%vs 25.0%)(P<0.05)。结论 ET-1基因+138A/-、K198N多态性与海南黎族人EH相关,ET-1基因+138A/-位点的4A3A基因型和4A等位基因、K198N位点的GT基因型、G8002A位点的A等位基因与海南黎族人EH相关,4A3A基因型、GT基因型、A等位基因可能是黎族EH发生的危险因素。     

内皮素-1基因Taq Ⅰ多态性与冠心病的关系

目的 探讨内皮素-1（ET-1）基因Taq Ⅰ多态性与中国汉族人群冠心病（CHD）的关系.方法 应用聚合酶链反应（PCR）、限制性片段长度多态性分析（RFLP）,对138例中国汉族CHD患者和112例对照组进行ET-1基因Taq Ⅰ多态性分析.结果 CHD组ET-1基因Taq Ⅰ多态性TT、TC、CC基因型频率与对照组比较,TC和CC基因型频率显着高于对照组,差异有极显着性（χ2=17.5,P＜0.01）.T、C等位基因频率与对照组比较,C等位基因频率显着高于对照组,差异有极显着性（χ2=15.56,P＜0.01）.经Logistic回归分析CHD的危险因素显示,ET-1基因Taq Ⅰ多态性（C等位基因）为CHD的一个独立危险因素.结论 ET-1基因Taq Ⅰ多态性与中国汉族人群CHD的发生具有相关性,C等位基因可能是CHD的易感性标志.     

内皮素-1与原发性高血压

原发性高血压时血浆内皮素-1水平升高,可导致外周阻力增加,并且通过激活ETA和ETB受体可加重高血压病心、肾、动脉系统的损害,形成恶性循环。ETA/ETB受体阻滞剂或选择性的ETA受体阻滞剂均能使全身血压下降,保护高血压病的靶器官。     

内皮素-1基因Taq I多态性与冠心病的关系

目的探讨内皮素-1(ET-1)基因Taq I多态性与中国汉族人群冠心病(CHD)的关系。方法应用聚合酶链反应(PCR)、限制性片段长度多态性分析(RFLP),对138例中国汉族CHD患者和112例对照组进行ET-1基因Taq I多态性分析。结果CHD组ET-1基因Taq I多态性TT、TC、CC基因型频率与对照组比较,TC和CC基因型频率显着高于对照组,差异有极显着性(X~2=17.5,P<0.01)。T、C等位基因频率与对照组比较,C等位基因频率显着高于对照组,差异有极显着性(X~2= 15.56,P<0.01)。经Logistic回归分析CHD的危险因素显示,ET-1基因Taq I多态性(C等位基因)为CHD的一个独立危险因素。结论ET-1基因Taq I多态性与中国汉族人群CHD的发生具有相关性,C等位基因可能是CHD的易感性标志。     

内皮素-1基因5'非翻译区多态性与体位性低血压相关性研究

目的探讨内皮素-1基因5’非翻译区一个功能性多态+138A/-与体位性低血压的关系。方法运用聚合酶链反应和限制性内切酶片段长度多态性方法分析381例未治疗高血压患者和291例血压正常者的内皮素-1基因+138A/-基因多态性。所有入选者均进行卧立位血压测量。结果高血压人群中体位性低血压患者与非体位性低血压组比较,内皮素-1基因+138A/-基因型和A等位基因频率差异无显著意义(14.7%vs.15.3%,P0.05)。正常血压人群中得到相似的结果(13.9%vs.15.7%,P0.05)。校正年龄、体重指数、卧位血压等因素后,高血压人群和正常人群中+138A/-各基因型间收缩压和舒张压体位性变化均无显著差异。结论在高血压人群和正常血压人群中均未发现内皮素-1基因+138A/-多态性与体位性低血压存在相关性的证据。     

多巴胺受体D1基因多态性与原发性高血压的相关性研究

目的:探讨多巴胺受体D1(DRD1)基因(-48A／G)多态性与原发性高血压的相关性。方法:采用多聚酶链式反应结合限制性内切酶片段长度多态性分析方法检测330例原发性高血压患者(高血压组) 和195例健康人(对照组)DRD1基因(-48A／G)多态性,并对两组人群的血压及各项临床指标进行测定。结果:高血压患者中,DRD1基因(-48A／G)多态性各基因型之间的收缩压、舒张压及平均动脉压有显著差异。其中, AG基因型的诊室舒张压、24h舒张压及24h平均动脉压显著高于AA基因型(P<0．05);GG基因型的诊室收缩压、诊室舒张压、诊室平均动脉压及24h舒张压、24h平均动脉压均显著高于AA基因型(P<0．05);AG基因型与GG基因型之间的收缩压、舒张压及平均动脉压均无显著差异(P>0．05)。结论:北京地区汉族人群中DRD1基因(-48A／G)多态性与原发性高血压明显相关。     

Endothelin-1 gene Lys198Asn polymorphism and blood pressure reactivity

The Lys198Asn polymorphism of the endothelin-1 gene has been associated with increased blood pressure levels in several studies involving European and Australian adults. The purpose of the present study was to examine the potential moderating influence of ethnicity, obesity, and socioeconomic status on associations between the ET-1/Lys198Asn polymorphism and hemodynamic function at rest and during two laboratory stressors (video game, forehead cold) in a sample of 161 black and 213 white American normotensive young adults (mean age, 18.5+/-2.7 years). Carrier status of the T allele was not associated with resting blood pressure or total peripheral resistance index. However, carriers of the T allele showed greater diastolic blood pressure increases to the video game (P<0.04), particularly among those who were obese (P<0.02). Carrier status also interacted with socioeconomic status such that T allele carriers who came from lower socioeconomic status backgrounds exhibited the greatest increases in systolic blood pressure to the video game challenge (P<0.05). In conclusion, the findings point out the importance of examining the impact of genetic polymorphisms on blood pressure control phenotypes within the context of potentiating environmental factors.     

Influence of Lys656Asn polymorphism of the leptin receptor gene on insulin resistance in nondiabetic obese patients

BACKGROUND: Alterations of the normal leptin receptor (LEPR) gene may be involved in the development of obesity. Leptin has been shown to be able to modulate insulin secretion. Different polymorphisms in the LEPR gene have been studied, albeit with unclear results. The polymorphism on codon 656 produces a change in charge, making this change possibly functional. OBJECTIVE: The objective of this study was to investigate the influence of Lys656Asn polymorphism in the LEPR gene on serum insulin, glucose values, and insulin resistance in the fasted state among obese men and women without diabetes mellitus. DESIGN: Two hundred thirty-three (body mass index, >30 kg/m(2)) nondiabetic obese patients were analyzed. Indirect calorimetry, tetrapolar electrical bioimpedance, blood pressure determination, serial assessment of nutritional intake with 3-day written food records, and biochemical analysis were performed. Statistical analysis was performed for Lys656/Asn656 and Asn656/Asn656 jointly as a mutant allelic group and for Lys656/Lys656 as a wild allelic group. RESULTS: The subjects' (67 males and 166 females) mean age and mean body mass index were 43.6+/-16.6 years and 35.3+/-5.6 kg/m(2), respectively. One hundred forty-three patients (61.9%) had the genotype Lys656/Lys656 (wild group), whereas 88 (38.1%) had either the genotype Lys656/Asn656 (n=81; 30.7%) or the genotype Asn656/Asn656 (n=7; 7.4%) (mutant group). Age and sex distribution were similar in both groups. No difference was detected between the mutant and wild allelic groups in anthropometric parameters and dietary intakes. Homeostasis model assessment (HOMA; 2.8+/-1.7 vs. 5.6+/-4.8; P<.05) and insulin (18.1+/-10.7 vs. 32.1+/-25 mUI/ml; P<.05) levels were higher in males with the genotypes Lys656/Asn656 and Asn656/Asn656 than in males with the genotype Lys656/Lys656. Leptin levels were higher in males with a mutant genotype than in males with a wild genotype (39.3+/-23 vs. 63.5+/-28 ng/ml; P<.05). CONCLUSION: The novel findings of our study are those of the association of the Lys656/Asn656 and Asn656/Asn656 genotypes with higher levels of insulin, HOMA, and leptin in males and the lack of such an association in females.     

增殖抑制基因单核苷酸多态性与原发性高血压的相关性

目的 探讨增殖抑制基因第二内含子7个单核苷酸多态性位点与原发性高血压的相关性.方法 筛选正常血压人群500名和原发性高血压患者930名,提取血中白细胞基因组DNA后设计特定的单核苷酸多态性引物进行定量多聚酶链反应,通过荧光定量方法确定该基因是否存在着某种特定的多态性位点.结果 7个不同的单核苷酸多态性中有3种即rs873457、rs2336384和rs4846085的基因型频率在正常血压组和原发性高血压组之间存在明显的差别(P<0.05),分别为TT:TC:CC=21.8%:46.6%:31.6%/22.5%:53.0%:24.5%、CC:CA:AA=21.8%:46.8%:31.4%/22.8%:52.6%:24.6%及TT:TC:CC=22.6%:46.4%:31.0%/23.4%:51.8%:24.7%,等位基因频率在正常血压组与原发性高血压组之间也存在明显差别(P<0.05),分别为T:C=45.1%:51.0%/49.0%:51.0%、C:A=45.2%:54.8%/49.1%:50.9%及T:C=45.8%:54.2%/49.1%:50.6%,其余4个单核苷酸多态性位点在正常血压组和原发性高血压组之间不存在明显的差别.对不同性别进行分析后发现在男性正常血压组与原发性高血压组的7个单核苷酸多态性位点之间均存在着明显的差别(P<0.05或P<0.01),而在女性正常血压组与原发性高血压组之间没有明显差别(P>0.05).相关性分析发现体质指数、年龄和基因型与血压之间存在着明显的相关性 (P<0.05).在进行了年龄和性别调整后,回归分析发现体质指数和rs873457与血压密切相关.单倍体型分析发现C-G-A-A-A-C-C(以 rs873457、rs2336384、rs1474868、rs4846065、rs4240897、rsrs2236055和 rs873458为序)无论在总体人群、男性还是女性人群中,均存在着明显的差别(P<0.01).结论 增殖抑制基因的基因多态性与高血压尤其是男性高血压之间存在着明显的差别.     

原发性高血压患者血浆肾上腺髓质素、内皮素-1的改变

目的 :观察高血压患者血浆肾上腺髓质素 (ADM)和内皮素 - 1(ET- 1)的改变。　　方法 :用特异性的放射免疫法测定 5 2例原发性高血压患者 [其中高血压 期 (高血压 期组 ) 2 5例 , 期 (高血压 期组 ) 16例 , 期 (高血压 期组 ) 11例 ]血浆 ADM、ET- 1水平并与正常对照组相比较。　　结果 :高血压 期组血浆 ADM、ET- 1水平显著高于高血压 期组、高血压 期组 (P<0 .0 1) ,高血压 期组、高血压 期组两者水平高于正常对照组 (P<0 .0 1) ,而高血压 期组与高血压 期组之间没有显著差异。　　结论 :高血压时血管细胞为抵消或减轻 ET- 1等缩血管物质的过度分泌而代偿性的合成和分泌 ADM增多。     

Endothelin-1 gene variant Lys198Asn and plasma endothelin level in obstructive sleep apnea

Obstructive sleep apnea (OSA) is a recognized risk factor for cardiovascular disorders. Thus, an association between endothelin-1 (EDN1) and OSA can be assumed. We investigated a cohort of 364 consecutive patients (age 57 +/- 10 years) with mild to severe OSA for the EDN1 variant Lys198Asn (G/T) and endothelin plasma levels and compared them with 57 controls. The Lys198Asn genotype was significantly associated with the apnea/hypopnea index (AHI) with a median of 30/h of sleep for GG, 27/h for GT and 59/h for TT genotype (p < 0.05). Further stratification of patients into 2 groups by body mass index (BMI) revealed a strong association between AHI and Lys198Asn polymorphism in 191 obese patients (p = 0.005), whereas in 173 nonobese patients, we observed no association. A substantial effect by BMI on OSA severity was seen with multiple linear regression (p < 0.001). However, this effect was modified by the Lys198Asn polymorphism and by gender: the AHI increase per unit of BMI was more pronounced in males than in females, and about 1.3 times greater in homozygous carriers of the mutant allele than in other carrier groups. EDN1 plasma levels of untreated OSA patients and of patients treated with nasal continuous positive airway pressure were not elevated compared with controls. Our results indicate that the Lys198Asn polymorphism is associated with the severity of OSA in obese subjects. The EDN1 plasma level cannot be used as a marker for OSA or its severity.     

载脂蛋白E基因多态性对血脂及高血压病的影响

为探讨载脂蛋白E基因多态性对血脂及高血压病的影响，采用聚合酶链式反应－限制性片段多态性方法测定112例原发性高血压病人及118例非高血压病对照的载脂蛋白E基因型。结果发现高血压病患者ε4等位基因频率及载脂蛋白E ε4携带者显著高于对照组（P＜0．05）。载脂蛋白E ε4携带者的总胆固醇和低密度脂蛋白胆固醇水平显著高于载脂蛋白E ε2携带者（P＜0．05），载脂蛋白E ε3／ε3携带者的低密度脂蛋白胆固醇水平也显著高于载脂蛋白E ε2携带者（P＜0．05）。载脂蛋白E ε4携带是高血压病的独立危险因素（P＜0．05）。研究表明载脂蛋白E基因多态性影响个体的血脂和脂蛋白水平，载脂蛋白E ε4为高血压病的一种重要遗传标志。