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Research of Reversal Effects of Losartan to the Ultrastrcture Lesion in Vascular Wall of SHR
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- Author:
- No author available
- Journal Title:
- JOURNAL OF MODERN CLINICAL MEDICAL BIOENGINEERING
- Issue:
- 2
- DOI:
- 10.3760/cma.j.issn.1674-1927.2002.02.004
- Key Word:
- 高血压大鼠;血管超微结构;AT1受体拮抗剂;细胞内钙
Abstract： 目的观察氯沙坦(Losartan)对自发性高血压大鼠(SHR)及正常对照组(WKY)的淋巴细胞胞浆游离钙[Ca2+]i、血管紧张素Ⅱ(AngⅡ)水平和血管壁超微结构的影响及其降压效应. 方法 SHR 28只分为3组,分别为3月龄对照组(SHR1)、6月龄对照组(SHR2)和Losartan治疗组(SHR3).治疗组从3月龄开始予Losartan 20mg/kg/d治疗至6月龄.治疗前后检测鼠尾收缩压、淋巴细胞胞浆游离钙[Ca2+]i、血浆AngⅡ和肠系膜动脉超微结构. 结果 Losartan对SHR有显著降压作用.治疗前SHR的淋巴细胞钙[Ca2+]i水平均显著性增加,随鼠龄增大而加大.肠系膜动脉出现明显血管壁损害,内皮细胞和平滑肌线粒体比表面均显著减少,而平滑肌细胞线粒体密度则显著增加.经Losartan治疗后,在降压的同时淋巴细胞[Ca2+]i显著性下降,血管壁超微结构的损害得到明显逆转. 结论高血压与血管平滑肌细胞存在的钙超负荷状态有关,并存在小动脉血管壁平滑肌和内皮细胞的超微结构损害.Losartan能有效逆转血管平滑肌的钙超负荷状态,降低SHR的动脉血压的同时逆转血管壁超微结构的损害.
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