Published
2025-07-16
Section
Articles
How to Cite
老年 Dahl 盐敏感大鼠盐诱导高血压发病机制的研究
孟 婷婷
西安培华学院/西安交通大学
马 怀芬
西安培华学院
高 祎凡
西安培华学院
DOI: https://doi.org/10.59429/xjjz.v7i2.10357
Keywords: 老年;Dahl 盐敏感大鼠;盐诱导;高血压
Abstract
目的:探讨过量盐摄入对老年 Dahl 盐敏感大鼠高血压形成的影响,并阐述其血压升高的机制。方法:选取 健康雄性 Dahl 盐敏感大鼠和 SS.13BN 大鼠共 32 只,鼠龄 50 周 +,体重 330±10g,各分为高盐饮食组(含 8% 氯化 钠)、正常盐饮食组(含 0.4% 氯化钠)。本实验采用无创大鼠尾动脉监测系统测量每组大鼠血压变化,高盐饮食喂 养持续 5 周后,采用水合氯醛(300mg/kg)腹腔麻醉大鼠,然后处死大鼠取肾脏组织,并分离肾皮质和肾髓质部分, 对肾脏组织进行 PAS 和天狼猩红染色,同时测定肾组织中 NO 含量及相关酶活测定。结果:5 周高盐饮食后,老年 DSS 大鼠的 MAP 升至约 136mmHg,较正常盐组升高了约 20mmHg,SBP 则升至约 173mmHg,较 SS-NS 组升高了 约 31mmHg。老年 DSS 大鼠肾组织 PAS 染色阳性面积显著升高。肾脏皮质中 NO 含量有降低趋势但无统计差异,髓 质中无显著变化。老年 DSS 和 SS.13BN 大鼠肾脏皮质和髓质中 NOS 活性均无显著影响,但老年 DSS 大鼠肾脏髓质 中 NOS 活性显著低于 SS.13BN 大鼠。结论:长期高盐诱导的影响盐敏感高血压大鼠血压,其机制可能与改善肾脏的 纤维化以及 NO 水平及 NOS 酶活性有关。
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