心血管疾病的血浆内皮素变化及其临床意义

目的：探讨某些心血管疾病时血浆内皮素（ＥＴ）的变化及其临床意义。方法：采用放射免疫法对３４例正常人与３４例急性心肌梗塞（ＡＭＩ）、４３例不稳定型心绞痛（ＵＡＰ）、２５例高血压病（ＨＴ）及２１例充血性心力衰竭（ＣＨＦ）患者分别进行了外周血浆ＥＴ水平的测定。结果：ＡＭＩ、ＨＴ及ＣＨＦ组血浆ＥＴ水平明显高于正常对照组（Ｐ＜００１），ＵＡＰ组血浆ＥＴ水平与正常对照组相比无显著性差异（Ｐ＞００５），ＡＭＩ组及ＣＨＦ组不同心功能分级及ＨＴ组不同分期之间，随病情加重，血浆ＥＴ水平有升高的趋势（Ｐ＜００１）。结论：血浆ＥＴ浓度与ＡＭＩ、ＵＡＰ、ＨＴ及ＣＨＦ的病理生理过程存在较为密切的关系。

The role of hypertension-related gene in aortic vascular smooth muscle cells from mice and rats

Objective To study the role of hypertension-related gene (HRG-1) in cardiovascular disease. Methods The expression of HRG-1 was analyzed with RT-PCR and Northern blotting. Vascular smooth muscle cell (VSMC) proliferation was measured with 3 H-TdR incorporation and was confirmed with histological analysis. Results Northern blot analysis showed that HRG-1 mRNA was expressed not only in VSMC, but also in various rat tissues (heart, brain, lung, kidney, and liver). In addition, the expression of HRG-1 mRNA in heart, brain, kidney and liver of spontaneously hypertensive rat (SHR) was lower than that in the same tissues of Wistar-Kyotorat (WKY). Semi-quantitative RT-PCR and histological analysis showed that the expression of HRG-1 mRNA in ApoE-knockout mice and in animal models of restenosis was decreased and neointimal formation was observed in both models. ET, AII, and IL-1 stimulating VSMC proliferation reduced the expression of HRG-1 mRNA of VSMC. Atrial natriuretic factor (ANF), calcitonin gene-related peptide and adrenomedullin, inhibited VSMC proliferation and elevated the expression of HRG-1 mRNA. These effects could be blocked or attenuated by their corresponding antagonists or antibodies. Conclusion HRG-1 is a gene related to VSMC proliferation. It may play an important role in several occlusive cardiovascular diseases including atherosclerosis, restenosis and hypertension.

高敏C-反应蛋白与老年冠心病的关系

目的探讨高敏C反应蛋白(hs-CRP)是否是老年冠心病的危险因素,及与心血管事件发生率的关系。方法对233名老年冠心病患者,按照hs-CRP水平分成三组,随访18个月,观察心血管事件的发生率。hs-CRP<1.0mg/L为低危组,1.0-3.0mg/L为中危组,>3.0mg/L为高危组。结果各组发生心血管事件的比率分别为高危组36.4%,中危组21.1%,低危组14.8%;p=0.01。高危组的危险性是低危组的2.5倍。发生心血管事件者平均hs-CRP水平比未发生者高(2.77±2.16比1.78±1.76mg/L;p<0.05)。结论HS-CRP是老年冠心病的独立危险因素,并且能预示心血管事件的发生。