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Effects of L-NAME on blood-brain barrier permeability after acute carbon monoxide poisoning in rats
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 10
- DOI:
- 10.3321/j.issn:1000-2790.2004.10.010
- Key Word:
- 一氧化碳中毒;血脑屏障;脑水肿;一氧化氮合酶;Nω-硝基-L-精氨酸甲酯
Abstract： 目的:研究一氧化氮合酶(nitric oxide synthase, NOS)抑制剂Nω-硝基-L-精氨酸甲酯(Nω- nitro- L-arginine methyl ester, L-NAME)对急性一氧化碳(carbon monoxide, CO)中毒大鼠血脑屏障(blood-brain barrier, BBB)通透性的影响,探讨NO介导CO中毒后BBB损伤的作用. 方法:建立实验性CO中毒大鼠模型. 将健康雌性SD大鼠40只随机分成4组(对照组,CO中毒组,染毒前15 min给L-NAME组和染毒后30 min给L-NAME组),每组10只. 用分光光度计法检测各组大鼠脑组织内伊文思蓝(Evans blue, EB)的含量,进行比较. 结果:CO中毒后24 h,大鼠大脑BBB通透性增加,脑组织内EB含量(27.6±1.2) μg/g与对照组(6.1±1.9) μg/g比较明显增高(P<0.01);给予L-NAME治疗的两组大鼠大脑BBB损伤减轻,脑组织内EB含量分别为(14.8±2.3) μg/g和(16.0±2.2) μg/g ,较CO组(27.6±1.2) μg/g明显降低(P<0.01). 结论:急性CO中毒可导致大鼠大脑BBB通透性增高,中毒早期应用NOS抑制剂L-NAME能够明显减轻大鼠大脑BBB损伤,提示NO参与了该损伤过程.
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