M235T基因多态性对血压影响的研究

目的：研究血管紧张素原基因（ＡＧＴ）第二外显子Ｍ２３５Ｔ等位基因的多态性与高血压之间的关系。方法：应用多聚酶链反应（ＰＣＲ）结合限制性酶切方法对１０５例健康体检者与１０２例原发性高血压（ＥＨ）患者进行基因突变的检测。结果：⑴ＥＨ患者Ｔ２３５等位基因频率（０．４４５）高于对照组（０．３２３）,Ｐ〈０．０５。在男性ＥＨ患者与男性对照组中差异更为明显（Ｐ〈０．０１）;⑵在有家族史的ＥＨ患者中,Ｍ２３５Ｔ     

血管紧张素原基因M235T分子变异与原发性高血压的关系

目的：探讨血管紧张素原（ＡＧＴ）基因Ｍ２３５Ｔ分子变异与中国人原发性高血压的关系。　　方法：对８９ 例原发性高血压（原发性高血压组）及９１ 例正常者（正常对照组）用多聚酶链式反应法及限制性片段长度多态性技术对ＡＧＴ基因Ｍ２３５Ｔ多态性进行了检测。　　结果：原发性高血压组Ｔ等位基因频率０．８０,ＴＴ基因型频率０．６７,与正常对照组（０．６６,０．４３）比较有显著性差异,（Ｐ＝ ０．０２３,Ｐ＝ ０．００４）;ＴＴ基因型较ＭＴ＋ ＭＭ 基因型对原发性高血压的比值比为２．７６（９５％ 可信区间为１．５０～５．０６,Ｐ＝ ０．００１）。　　结论：ＡＧＴ基因ＴＴ基因型可能与中国人群原发性高血压发病有关联。     

老年痴呆患者apoE基因型分布

目的观察中国老年痴呆患者ａｐｏＥ基因型的分布，初步探讨ａｐｏＥ在老年痴呆发病中的作用。方法应用聚合酶链式反应（ＰＣＲ）对３５例健康人、２３例多梗塞性痴呆（ＭＩＤ）及１７例老年性痴呆（ＡＤ）患者进行ａｐｏＥ基因多态性分析，测定血清胆固醇（ＴＣ）、甘油三酯（ＴＧ）、高密度脂蛋白胆固醇（ＨＤＬ－Ｃ）、低密度脂蛋白胆固醇（ＬＤＬ－Ｃ）、载脂蛋白ＡⅠ（ａｐｏＡⅠ）、载脂蛋白Ｂ（ａｐｏＢ）和载脂蛋白Ｅ（ａｐｏＥ）的浓度。结果ＡＤ组与健康对照组在ａｐｏＥ基因频率及等位基因频率分布上的差异有显著性（χ２＝１１．５，Ｐ＜０．０５；χ２＝１６．２，Ｐ＜０．０１）；ＭＩＤ组与健康对照组间差异无显著性（Ｐ＞０．０５）；应用Ｗｏｏｌｆ公式计算，发现ａｐｏＥε４等位基因与ＡＤ之间有显著性关联（χ２＝７．７，Ｐ＜０．０１），相关危险度（ＲＲ）＝３．０。ＡＤ组血清ａｐｏＥ水平显著高于对照组（Ｐ＜０．０５），而ＴＣ、ＬＤＬ－Ｃ、ａｐｏＡⅠ、ａｐｏＢ显著低于对照组（Ｐ＜０．０５）。结论结果提示ａｐｏＥε４等位基因与老年性痴呆有显著性关联，ａｐｏＥε４可能是ＡＤ发病的危险因素。     

老年男性冠心病患者血清硫酸脱氢表雄酮含量变化的临床意义

目的观察老年男性冠心病患者血清硫酸脱氢表雄酮（ＤＨＥＡ－Ｓ）含量变化，探讨其与睾酮（Ｔ）、胰岛素（ＩＮＳ）、血糖（Ｇｌｕ）、甘油三酯（ＴＧ）、总胆固醇（ＴＣ）、载脂蛋白Ｂ（ａｐｏＢ）及年龄的相关性。方法用放免法测定６９例老年男性冠心病患者血清ＤＨＥＡ－Ｓ含量，并与３５例年龄匹配的男性健康人对照。结果冠心病组ＤＨＥＡ－Ｓ含量（２．９６±１．８０μｍｏｌ／Ｌ）显著低于对照组（４．０６±１．７６μｍｏｌ／Ｌ，Ｐ＜０．０１），病情重组（２．４４±１．３６μｍｏｌ／Ｌ）又明显低于病情轻组（３．３２±２．１２μｍｏｌ／Ｌ，Ｐ＜０．０５）；冠心病组ＤＨＥＡ－Ｓ含量与年龄呈负相关（ｒ＝－０．３０５４，Ｐ＜０．０１），对照组两者也呈负相关（ｒ＝－０．３６１５，Ｐ＜０．０５）；冠心病患者ＤＨＥＡ－Ｓ降低与空腹血清ＩＮＳ、ＴＧ及ａｐｏＢ增高均呈负相关（分别为ｒ＝－０．３２９７、－０．２５１９及－０．２４１３，Ｐ＜０．０１或０．０５）。结论老年男性冠心病患者血清ＤＨＥＡ－Ｓ含量降低，并与冠心病某些危险因素如老年、高胰岛素血症、高甘油三酯血症、血清ａｐｏＢ高值相关，但其确切的发病机理有待深入研究。     

老年男性Ⅱ型糖尿病患者血清性激素变化及与冠心病的关系

对≥６０岁的男性Ⅱ型糖尿病（Ⅱ－ＤＭ）患者及合并冠心病患者各５０例进行研究，测定其血清Ｔ、Ｅ２、血糖（ＧＬＵ）、ＴＣ、ＴＧ水平。结果：男性Ⅱ－ＤＭ及合并冠心病患者血清Ｔ低于健康对照组（Ｐ＜０．０５和Ｐ＜０．０１），血清Ｅ２也有下降趋势（Ｐ＞０．０５），Ｅ２／Ｔ比值则高于对照组（Ｐ＞０．０５）；相关分析显示Ｔ与ＧＬＵ、ＴＣ、ＴＧ均呈负相关（Ｐ＜０．０１），而Ｅ２则似乎与ＧＬＵ、ＴＣ、ＴＧ无明显相关性，ＧＬＵ与ＴＣ、ＴＧ呈正相关（Ｐ＜０．０１）。结论：Ⅱ－ＤＭ及冠心病患者均存在性激素改变，并与血糖、血酯一起构成影响糖尿病、冠心病的不利因素。     

Graves''''病患者下丘脑-垂体-性腺轴功能的变化

目的探讨Ｇｒａｖｅｓ’病（ＧＤ）患者下丘脑垂体性腺轴功能的变化。方法对５０例ＧＤ患者评价性功能，用放免法测定黄体生成素（ＬＨ）、卵泡刺激素（ＦＳＨ）、总睾酮（ＴＴ）、游离睾酮（ＦＴ）、雌二醇（Ｅ２）、并进行黄体生成素释放激素（ＬＨＲＨ）兴奋试验。结果治疗前男女ＧＤ患者ＬＨ、ＦＳＨ均高于正常组（Ｐ＜０．０５），ＬＨＲＨ兴奋试验反应增强。男性ＧＤ患者ＴＴ高于正常组（Ｐ＜０．０５），ＦＴ则低于正常组（Ｐ＜０．０５），已婚者性功能障碍者占４２．８％。女性ＧＤ患者Ｅ２较正常组高（Ｐ＜０．０１），月经紊乱者占７５％，已婚者性功能障碍５７．１％。治疗后上述改变随着甲状腺功能正常而恢复正常。结论ＧＤ患者存在下丘脑垂体性腺轴功能紊乱，属可逆性的。     

血管紧张素Ⅱ一型受体基因 A 1166C多态性与高血压病的关系

研究中国汉族人血管紧张素 Ｉ Ｉ的 Ｉ型受体（ Ａ Ｔ１ Ｒ） Ａ１１６６ Ｃ 基因多态性与原发性高血压的关系。　方法：测定１２０ 例汉族原发性高血压病人和 ８６ 个汉族正常人的血压、体重指数、空腹血糖及血胆固醇和甘油三酯浓度。用盐析法提取外周血白细胞 Ｄ Ｎ Ａ,用 Ｐ Ｃ Ｒ加上限制性酶切方法检测 Ａ Ｔ１ Ｒ的 １１６６ 位基因突变。　结果：高血压组除收缩压、舒张压显著高于对照组外,其它临床指标如体重指数、空腹血糖及血脂水平两组间无显著差异; Ｅ Ｈ 患者 Ａ Ｔ１ Ｒ 基因 Ａ Ｃ基因型频率比正常对照组 Ａ Ｃ基因型频率高（０．１８１ ｖｓ ０．０５８, Ｐ＜ ０．０１）, Ｃ１１６６ 等位基因频率 Ｅ Ｈ 组高于正常对照组（０．０９１ ｖｓ ０．０２９, Ｐ＜ ０．０５）;两组中均未发现 Ｃ Ｃ纯合子基因型。　结论：在中国汉族人群中, Ａ Ｃ基因型与原发性高血压有关, Ｃ等位基因可能是一个高血压的易感基因。     

血管紧张素原基因多态性与高血压关系的研究

目的研究中国人血管紧张素原基因多态性与原发性高血压的关系。方法应用聚合酶链反应对天津地区１１２例正常人及１３１例高血压患者ＡＧＴ基因２３５位点限制酶切片段长度多态性进行检测。结果ＡＧＴ基因２３５位点有三种基因型为ＴＴ、ＴＣ、ＣＣ，其中ＣＣ基因型与高血压发病相关，高血压组Ｃ基因频率高于对照组（Ｐ＝０．０３２）。结论ＣＣ基因型与Ｃ等位基因可作为高血压易感性的指标     

血管紧张素原基因M235T多态性对NIDDM患者发生高血压的影响

目的 研究血管紧张素原（ＡＧＴ）基因Ｍ２３５Ｔ多态性对ＮＩＤＤＭ患者发生高血压的影响。方法 用限制性普分析法检查ＡＧＴ基因Ｍ２３５Ｔ多态性Ｍ２３５和Ｔ２３５的频率和ＴＴ、ＴＭ和ＭＭ基因型在正常对照组（６８例）、糖悄病非高血压组（１０４例）和糖尿病高血压组（８７例）中的分布，并检查各基因型对实验对象血压水平的影响。结果 糖尿病高血压组患者ＡＧＴ基因Ｍ２３５Ｔ多态性Ｔ２３５的频率明显高于对照组和糖尿病     

载脂蛋白E基因多态性与冠心病关系的研究

目的：探讨载脂蛋白Ｅ（ａｐｏＥ）基因多态性在冠心病（ＣＨＤ）发生发展中的作用及其对血脂质、脂蛋白水平的影响。方法：应用聚合酶链反应技术和遗传学方法,测定９３ 例ＣＨＤ患者和９４例正常对照者的ａｐｏＥ基因型;按常规方法测定血浆脂质、脂蛋白水平。结果：共发现５ 种ａｐｏＥ基因型,分别为Ｅ３／３、Ｅ３／２、Ｅ４／３、Ｅ４／２和Ｅ４／４。ＣＨＤ组ａｐｏＥ４／３ 基因型和ε４ 等位基因频率及总胆固醇（ＴＣ）、低密度脂蛋白胆固醇（ＬＤＬ－Ｃ）均显著高于对照组（均Ｐ＜ ０．０１）,ａｐｏＡＩ的水平高于对照组（Ｐ＜ ０．０５）,其他血脂指标无显著性差异（ Ｐ＞ ０．０５）。在ＣＨＤ组各亚型之间,ＴＣ、ＬＤＬ－Ｃ和ａｐｏＡＩ水平之间存在显著性差异（Ｐ＜ ０．０５）。结论：ａｐｏＥε４ 等位基因是ＣＨＤ重要的遗传易患因素,ａｐｏＥ基因多态性亦影响血ＴＣ、ＬＤＬ－Ｃ和ａｐｏＡＩ水平。     

AT_1R基因多态性对血压的影响

目的 检测血管紧张素Ⅱ的Ⅰ型受体(AT_1R)C1166等位基因在正常人和原发性高血压(EH)患者中的频率,并研究中国汉族人AT_1R基因多态性与原发性高血压的关系.方法 测定120例汉族原发性高血压病人和86个汉族正常人的血压、体重指数、空腹血糖及血胆固醇和甘油三酯浓度.用盐析法提取外周血白细胞DNA,用PCR加上限制性酶切方法检测AT_1R的C1166位基因突变.结果 高血压组除收缩压、舒张压显著高于对照组外,其它临床指标如体重指数、空腹血糖及血脂水平两组间无显著差异;EH患者AT_1R基因AC基因型频率比正常对照组高(0.081vs 0.058,P<0.01),C1166等位基因频率EH组高于正常对照组(0.091vs 0.029,P<0.05);两组中均未发现CC纯合子基因型;进行性别分组后,发现在女性EH患者C1166等位基因频率高于女性正常对照组(0.125 vs 0. 031,P<0.05),在男性EH患者C166频率与男性正常对照组无显著差异(0.072vs O.028,P>0.05);将EH组分为有、无高血压家族史两组,发现有高血压家族史的EH患者C1166频率高于无家族史EH患者(0.123 vs 0.035,P<0.05).结论 在中国汉族人群中,AT_1R基因多态性与原发性高血压有关;C1166等位基因可能是一个高血压的易感基因,并与有家族史的原发性高血压以及女性高血压病密切相关.     

AGT基因M235T多态同哈萨克族高血压病的关联分析

目的探讨新疆哈萨克族血管紧张素原（angiotensinogen,AGT）基因第二外显子（M235T）多态性同高血压病（essential hypertension,EH）的关系。方法4次高血压流行病学调查采集新疆巴里坤哈萨克族EH组278例,正常血压（norm altensive,NT）组220例。测定EH患者和NT者体质量指数（BM I）、空腹血糖、血浆胆固醇、甘油三酯。用MS-PCR法（mutagen ically separated polym erase chain reaction techn ique）检测AGT基因M235T多态性。结果M235T多态性符合Hardy-W e inberg平衡。MT、TT、MM基因型分布频率在EH组及NT组分别为32.7%,62.6%,4.7%;38.2%,51.8%,10.0%。T等位基因频率分别为79.0%及70.9%。M235T基因型频率（P<0.05）及等位基因频率（P<0.01）分布在EH组及NT组均有显著性差异。T等位基因携带者OR值为非T等位基因携带者OR值的2.3倍（95%C I 1.14.6;P<0.05）。对未治疗的EH者在不同基因型间进行比较,未发现MT、MM、TT基因型间收缩压、舒张压、体质量指数、血糖、血脂水平有显著性差异。结论AGT基因M235T可能同新疆哈萨克族高血压病发病相关。     

性别因素对原发性高血压候选基因研究的影响作用

目的探讨研究样本中的性别因素对原发性高血压（EH）候选基因研究结果的影响。方法应用聚合酶链反应这一分子生物学研究方法,分析EH组患者及正常血压对照组（两组中男性女性人数相等）人群血管紧张素转换酶（ACE）基因插入／缺失（I／D）多态性,进而探讨性别比例对该类研究结论的可能影响。结果男性EH组DD基因型频率显著高于男性对照组（x^2=6．98,P=0．004）,D等位基因频率在男性EH组亦较男性对照组显著增高（x^2=6．87,P=0．009）,而ID和II基因型频率在男性EH组和男性对照组间差异无统计学意义（P〉0．05）。女性EH组与女性对照组比较,各基因型和等位基因频率分布差异均无统计学意义（P〉0．05）;男性EH组中的DD基因型分布比例与女性EH组中的DD基因型分布比例相比有显著统计学意义（x^2=4．06,P=0．044）。此外,EH组中男性DD型者的收缩压及脉压水平均显著高于ID型和II型者（P均〈0．05）,但舒张压在3种基因型间差异无统计学意义（P〉0．05）。同时,EH组II、ID基因型的男性的收缩压、舒张压、脉压差异均无统计学意义（P〉0．05）。女性患者中,各基因型间收缩压、舒张压及脉压的水平差异均无统计学意义（P〉0．05）。结论男性中的DD基因型成员与EH（尤其在收缩压、脉压）的关联可能比男性中的II、ID基因型以及所有的女性更为密切。性别可能作为一个混杂因素,对包括ACE基因I／D多态性在内的诸多EH候选基因与EH的相关性研究的结论产生影响。     

M235T polymorphism of human angiotensinogen gene in essential hypertension in Polish population

Genetic factors play very important role in the pathogenesis of essential hypertension. Angiotensinogen gene is one of the candidate genes in the research concerning genetic background of elevated blood pressure. The aim of this work was to assess an association of M235T polymorphism in human angiotensinogen gene with essential hypertension in Polish population. 250 patients with essential hypertension and 150 normotensives were involved in the study. M235T polymorphism was detected using polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) methods. Polymorphic allele and genotypes frequencies did not differ between hypertensive and normotensive groups. However T allele and TT genotype frequency among hypertensive men was higher than in normotensive men. The difference is statistically significant. T allele and TT genotype occurred more frequently in hypertensives with positive family history of essential hypertension. The difference between hypertensive men with positive family history and normotensive men was even more significant. This results are similar to those already published by other authors concerning Caucasian populations and indicate that angiotensinogen gene is involved in the determination of at least some cases of essential hypertension.     

肾素-血管紧张素系统基因多态性与原发性高血压左心室肥厚关系的探讨

目的　探讨肾素 血管紧张素系统 (RAS)基因多态性与原发性高血压左心室肥厚 (EH LVH)的相关性以及在EH LVH产生中的多基因协同作用。方法　对 10 9例原发性高血压病 (EH)患者 ,采用聚合酶链反应 (PCR)以及聚合酶链反应 限制性片段长度多态性方法检测血液白细胞染色体DNA中血管紧张素转换酶 [ACE(I D) ]、血管紧张素原 [AGT(M2 35T) ]和血管紧张素Ⅱ 1型受体 [AT1 R(A116 6C) ]基因多态性 ;利用超声心动图检测左心室质量 (LVM)并计算左心室质量指数 (LVMI)。结果　ACE(I D)基因多态性D等位基因频率在EH LVH组中明显增高 (χ2 =4 .6 9,P=0 .0 30 ) ,男性EH患者中 ,ACE(I D)基因型构成比与LVH有关联 (χ2 =9.5 5 ,P =0 .0 0 8)。协同存在AGT TT型时 ,ACE(I D)基因多态性与EH LVH有关 (χ2 =6 .2 2 ,P =0 .0 4 4 ) ,且D等位基因在EH LVH明显增高 (χ2 =6 .91,P =0 .0 0 9) ,该类EH患者发生LVH的相对危险度增高 (OR :2 .5 0 ,95 %CI:1.2 5～ 5 .0 0 )。结论　ACE(I D)基因多态性D等位基因可能是LVH的独立危险因子。ACE基因多态性与AGT基因多态性之间的协同效应表明 ,同时携带AGT TT型时 ,具有ACE(I D)基因多态性D等位基因的EH患者更易发生LVH。     

Angiotensinogen M235T variant and salt sensitivity in young normotensive Caucasians.

BACKGROUND AND AIMS: A single-nucleotide variant of the angiotensinogen gene (AGT 235T) has been associated with essential hypertension and increased plasma levels of angiotensinogen. This variant may also serve as a genetic marker for the increased blood pressure response to dietary salt intake, but the relationship between AGT genotype and salt sensitivity has not been studied until now. We therefore examined the relationship between the AGT 235T genotype and the blood pressure response to short-term dietary salt restriction in young normotensive men. SUBJECTS AND METHODS: A total of 187 young normotensive men were characterized for family history of hypertension, salt sensitivity, plasma parameters of the renin-angiotensin system under high- and low-salt diets, and the AGT 235T genotype. RESULTS: While the T allele was significantly associated with a positive family history of hypertension (chi2 = 7.0; P< 0.03) and higher plasma angiotensinogen levels (P< 0.015) and renin activity (P < 0.037), blood pressure under both diets was not significantly affected by the AGT genotype. When the subjects were classified into salt-resistant and salt-sensitive groups, genotypic distribution was nearly identical between both groups (frequency of T allele: 0.45 versus 0.46). CONCLUSION: Our findings demonstrate that the AGT 235T allele is significantly associated with a positive family history of hypertension, but is not an important determinant of the blood pressure response to dietary salt intake in young normotensive subjects. It is therefore unlikely that the AGT 235T genotype can serve as an early genetic marker of salt sensitivity.     

Association between angiotensinogen gene M235T polymorphism and mitral valve prolapse syndrome in Taiwan Chinese

BACKGROUND AND AIM OF THE STUDY: It has been reported that patients with mitral valve prolapse syndrome (MVPS) also have a disorder in autonomic or neuroendocrine function which can cause many related symptoms. Although a potential role of the reninangiotensin system in the pathogenesis of MVPS has been addressed, the role of the angiotensinogen (AGT) genetic variant in MVPS has not been studied. Thus, a case-controlled study was performed to investigate the possible relationship between AGT gene polymorphisms and MVPS. METHODS: A total of 100 patients with MVP diagnosed by echocardiography and 100 age- and sex-matched normal control subjects was studied. AGT gene M235T and T174M polymorphisms were identified by polymerase chain reaction-based restriction analysis. RESULTS: There was a significant difference in the distribution of AGT gene M235T genotypes (p <0.001) and allelic frequencies (p <0.001) between MVPS cases and controls. An Odds Ratio (OR) for risk of MVPS associated with M235T TT genotype was 8.55 (95% CI 4.51-16.18). An OR for risk of MVPS associated with the T allele at the M235T locus of the AGT gene was 3.27 (95% CI 2.05-5.22). The T174M polymorphism of AGT gene showed no association with MVPS (p = 0.94). CONCLUSION: These findings suggest that the M235T polymorphism of the AGT gene is associated with MVPS in the Chinese population of Taiwan. The association of the TT genotype with MVPS is more noteworthy than an overall increase in the frequency of the T allele at the M235T locus.     

The M235T polymorphism in the angiotensinogen gene is associated with the risk of malignant hypertension in white patients

BACKGROUND: Malignant hypertension can be considered an extreme phenotype of renin-mediated hypertension. Therefore, we compared the allelic frequencies of the angiotensinogen (AGT) M235T, angiotensin-converting enzyme insertion/deletion (ACE I/D) and angiotensin II-type I receptor (AT1R) A1166C polymorphisms in malignant hypertensive patients with hypertensive and normotensive controls. METHODS: A total of 101 consecutive patients between 1995 and 2005 admitted to a large university hospital fulfilled the criteria for malignant hypertension. Seventy-five patients (74%) were compared with 150 hypertensive and 150 normotensive controls, randomly selected from a population study and individually matched on age, sex and ethnicity. RESULTS: The odds of malignant hypertension in white subjects with the TT genotype of the AGT M235T polymorphism was 14.3 (5.5-37) compared to hypertensive controls, and 9.4 (3.8-23.2) compared to normotensive controls. Adjustment for age, sex, smoking and antihypertensive therapy did not affect this association. The association of AGT M235T with malignant hypertension was not significant in blacks. In patients with malignant hypertension, the TT genotype was associated with more severe renal dysfunction and microangiopathic haemolysis. No differences were found in allele frequencies of the ACE I/D or the AT1R A1166C polymorphisms between study groups. CONCLUSIONS: The TT genotype of AGT M235T is associated with malignant hypertension in whites, carriers having an odds of approximately 10 to 1 compared to hypertensive and normotensive controls. These observations may provide a better understanding of the pathophysiology of malignant hypertension and offer possibilities for identifying patients at risk. Larger association or linkage studies are needed for a more detailed risk assessment.     

家族性原发性高血压与血管紧张素原基因M235T突变关系的研究

目的：探讨血管紧张素原基因Ｍ２３５Ｔ突变与家族性原发性高血压（ＥＨ）的关系。　　方法：应用脱氧核糖核酸（ＤＮＡ）杂交和测序检定方法,对一个典型原发性高血压大家系１００名成员［分直系亲属高血压组（ｎ＝ ４５）、直系亲属正常血压组（ｎ＝ ３８）及非直系亲属正常血压组（ｎ＝ １７）］和正常血压对照家系直系亲属２１ 名（为正常对照组）成员按＜ ３５岁和≥３５岁２个年龄层的Ｍ２３５Ｔ突变进行分析。　　结果：比较４组在＜ ３５ 岁和≥３５ 岁２个年龄层的Ｍ２３５Ｔ分布。表明各年龄层中,４组间Ｍ２３５Ｔ基因型及基因频率分布未见显著不同。　　结论：血管紧张素原基因Ｍ２３５Ｔ突变与该家族性原发性高血压没有显著关联;Ｍ２３５Ｔ突变可能不是该家族性原发性高血压的遗传易感因素。     

Angiotensinogen T174M and M235T gene polymorphisms are associated with the extent of coronary atherosclerosis.

BACKGROUND: The relations of the angiotensinogen (AGT) T174M and M235T gene polymorphisms to the risk of coronary heart disease (CHD) have been investigated in only a few studies with conflicting results. RESULTS: Therefore, we analysed the relationship of the AGT gene polymorphisms to the presence and extent of CHD in 2250 male Caucasians whose coronary anatomy was defined by means of coronary angiography. The relative frequencies of the T and M alleles of the T174M and of the M235T gene variation did not significantly differ between patients without or with single-, double- or triple-vessel disease and between subjects without or with myocardial infarction (MI). In contrast the mean CHD score--defined by Gensini--was higher within MM homozygotes of the T174M gene variation than within TT genotypes; TM subjects had intermediate values. In M235T genotypes, mean CHD scores were similar in the total sample and in older individuals (> or = 62 years), whereas in younger individuals (< 62 years) a higher CHD score was found within AGT 235 T allele carriers than within MM homozygotes. In younger individuals with high apoAI plasma levels, the mean CHD score was clearly higher within TT homozygotes of the M235T gene variation than within MM genotypes; MT subjects had intermediate values. An interaction between both angiotensinogen gene polymorphisms on the extent of CHD or on the risk of non-fatal MI were not observed when the M allele of AGT T174M was combined either with the T allele or the TT genotype of M235T. CONCLUSIONS: The present study strengthens the hypothesis of an association of both angiotensinogen gene polymorphisms with the extent of coronary heart disease.