欢迎访问《中国农学通报》,

中国农学通报 ›› 2015, Vol. 31 ›› Issue (2): 55-61.doi: 10.11924/j.issn.1000-6850.2014-1588

所属专题: 畜牧兽医

• 畜牧 动物医学 蚕 蜂 • 上一篇    下一篇

β-谷甾醇对脂多糖诱导的小鼠急性肺损伤的保护作用研究

姚 凤1,周清燕2,熊 瑛3,关 爽3   

  1. (1湖南省湘潭市动物卫生监督所,湖南湘潭 411104;2湖南省湘潭县畜牧兽医水产局,湖南湘潭 411228;3吉林大学农学部,长春 130062)
  • 收稿日期:2014-06-05 修回日期:2014-12-17 接受日期:2014-09-09 出版日期:2015-03-19 发布日期:2015-03-19
  • 通讯作者: 关爽
  • 基金资助:
    无基金项目支持

Protective Effects of β-Sitosterol on Acute Lung Injury Induced by Lipopolysaccharide in Mice

Yao Feng1, Zhou Qingyan2, Xiong Ying3, Guan Shuang3   

  1. 1Station of Health Supervision for Animal, Xiangtan City, Xiangtan Hunan 411104;2Bureau of Animal Husbandry and Aquatic Aquiculture of Xiangtan Country of Hunan Province, Xiangtan Hunan 411228; 3College of Veterinary Medicine, Jilin University, Changchun 130062)
  • Received:2014-06-05 Revised:2014-12-17 Accepted:2014-09-09 Online:2015-03-19 Published:2015-03-19

摘要: 为了探究β-谷甾醇对LPS诱导的急性肺损伤小鼠的保护作用及其可能的机制,利用酶联免疫吸附法(ELISA)测定β-谷甾醇对RAW 264.7细胞产生肿瘤坏死因子(TNF-α)和白细胞介素-6(IL-6)的影响。给BALB/c小鼠鼻腔滴注LPS(0.5mg/kg)构建小鼠急性肺损伤模型,滴鼻24 h后检测各指标。ELISA检测小鼠肺泡灌洗液中(BALF)的炎性细胞因子含量;称重法检测肺组织湿/干重比和肺含水量;HE染色法观察肺组织病理形态学变化;应用蛋白印迹法(western blot)检测小鼠肺脏中核转录因子-κB (NF-κB)信号转导通路中相关蛋白的含量变化。结果表明,β-谷甾醇能剂量依赖性降低RAW 264.7细胞上清及ALI小鼠BALF中TNF-α和IL-6的表达水平。肺脏称重结果和病理形态学结果显示β-谷甾醇可明显减轻LPS诱导的肺水肿和炎症反应。另外,western blot结果表明β-谷甾醇不仅能够下调NF-κB p65 的活化,还抑制了NF-κB阻断剂IκBα的磷酸化。β-谷甾醇对LPS所致的小鼠急性肺损伤有较好的保护作用,其保护机制可能与阻止炎症因子(TNF-α、IL-6)的释放和下调NF-κB信号转导通路的活化有关。

关键词: 土壤肥力, 土壤肥力

Abstract: The paper aims to investigate the mechanism and protective effects of β-sitosterol on mice with Lipopolysaccharide (LPS)-induced acute lung injury (ALI). We evaluated the effect of β-sitosterol on LPS-induced production of TNF-α and interleukin (IL)-6 in the culture supernatants of RAW 264.7 cells by enzyme-linked immunosorbent assay (ELISA). Model of ALI in BALB/c mice was built by LPS (0.5 mg/kg) intranasal instillation and the severity of pulmonary injury was evaluated 24 h after LPS challenge. The inflammatory cytokines were assayed with ELISA in bronchoalveolar lavage fluid (BALF); the ratio of lung wet weight to dry weight (W/D) and water content were also measured; lung tissues were stained with Hematoxylineosin to observe the pathological. In addition,the activity changes of nuclear factor-κB (NF-κB) were detected by western blot. β-sitosterol could dose-dependently decrease the levels of TNF-α and IL-6 in vitro and in vivo. Pretreatment with β-sitosterol was found to decrease the W/D ratio and water content of the lung tissue and suppress lung edema and pulmonary alveolar damage at the same time. In addition, β-sitosterol suppressed not only the phosphorylation of NF-κB but also the degradation of its inhibitor (IκBα). β-sitosterol had good protective effect against ALI induced by LPS, and its mechanism might be related with down-regulated inflammatory cytokines (TNF-α, IL-6) and NF-κB expressions.