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硫化氢在脂多糖所致老年大鼠急性肺损伤中的作用 被引量:2

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摘要 目的探讨硫化氢(H2S)在脂多糖(LPS)所致老年大鼠急性肺损伤(ALI)中的作用机制。方法64只SD老年大鼠随机分为对照组、LPS组、NaHS+LPS组、炔丙基甘氨酸(PPG)+LPS组,每组16只。LPS组、NaHS+LPS组、PPG+LPS组经气管内滴注LPS200μg/只,制备大鼠ALI模型;对照组经气管内滴注无菌生理盐水200μl/只。NaHS+LPS组制模前10min腹腔注射NaHS28μmol/kg,PPG+LPS组制模前10min腹腔注射PPG45mg/kg。给药后4h或8h处死动物,测定肺系数;光镜观察肺组织形态学改变;化学法检测血浆H2S、NO和CO含量、肺组织丙二醛(MDA)含量、胱硫醚-γ-裂解酶(CSE)、诱导型一氧化氮合酶(iNOS)和血红素加氧酶-1(HO-1)活性;采用免疫组织化学法检测肺组织iNOS、HO-1蛋白表达及吸光度值。结果气管内滴注LPS可引起肺组织明显的形态学改变;肺系数和肺组织MDA含量增加;血浆H2S含量和肺组织CSE活性下降;肺组织iNOS活性和iNOS蛋白表达增强,血浆NO含量增加;肺组织HO活性和HO-1蛋白表达增强,血浆CO含量增加。预先给予NaHS可显著减轻LPS所致肺组织损伤,肺系数和肺组织MDA含量下降;血浆H2S含量和肺组织CSE活性升高;肺组织iNOS活性和iNOS蛋白表达减弱,血浆NO含量减少;肺组织HO活性和HO-1蛋白表达增强,血浆CO含量增加(均P<0.05)。而预先给予PPG可加重LPS所致肺损伤,使血浆NO含量、肺组织iNOS活性和iNOS蛋白表达进一步增加(均P<0.05),但对血浆CO含量、HO活性和HO-1蛋白表达无明显影响。结论H2S/CSE体系的下调在LPS所致老年大鼠ALI的发病学中有一定作用,而外源性给予一定量的NaHS对肺组织具有保护作用,其可能与抗氧化效应和下调NO/iNOS体系、上调CO/HO-1体系有一定关系。
出处 《中国老年学杂志》 CAS CSCD 北大核心 2009年第21期2764-2767,共4页 Chinese Journal of Gerontology
基金 河北省科学技术研究与发展计划基金资助项目(06276102D-41)
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共引文献128

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