资源描述
SB203580 防治大鼠高氧肺损伤的作用与机
制
作者:罗莉漫,孙志强,余健,聂国明,刘静,邹敏书
【摘要】 目的:探讨 p38 丝裂素活化蛋白激酶(p38MAPK)特
异性抑制剂 SB203580 对新生大鼠高氧肺损伤产生保护作用的机制.
方法:160 只新生大鼠随机分为空气对照组、高氧肺损伤组、高氧肺
损伤+SB203580 组和高氧肺损伤+生理盐水组, 建立模型. 作用 12, 24,
72 h 和 1 wk 后,分别处死大鼠. 取大鼠 72 h 的左肺以 Western Blot
法检测 p38MAPK 的表达情况,取大鼠 4 个时相点的右肺以 ELISA 法检
测 IL 8 和 TGF b1 的含量. 结果:72 h 时, 高氧肺损伤组和高
氧肺损伤+生理盐水组 p38MAPK 呈阳性表达;在这两个组中,肺组织
IL 8 和 TGF b1 浓度随时间延长呈持续上升趋势,在各时相点均
高于空气对照组和高氧肺损伤+SB203580 组(P<0.01). 结论:
SB203580 能够通过阻断 p38MAPK 表达,进而抑制 IL 8 和 TGF b1
表达来减轻新生大鼠高氧肺损伤.
【关键词】 肺/损伤; 高氧;p38 丝裂素活化蛋白激酶;IL 8;
TGF b1
【 Abstract 】 AIM: To investigate the mechanism of
protection from hyperoxia induced lung injury in new born
rats by SB203580, a p38MAPK specific inhibitor. METHODS: A total
of 160 new born rats were divided into air control group,
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hypero xia induced lung injury group, hyperoxia induced
lung injury + SB203580 group and hyperoxia induced lung injury
+ sodium chloride group randomly. At the time points of 12, 24,
72 h and 1week, rats were executed, respectively. Left lungs at
the time point of 72 h were availed to detect the expression of
p38MAPK by Western Blot, and right lungs at the 4th time point
were availed to detect the concentrations of IL 8 and TGF
b1 by ELISA. RESULTS: At the time point of 72 h, p38MAPK was
expressed positively in hyperoxia induced lung injury group
and hyperoxia induced lung injury + sodium chloride group;in
the two groups, the concentrations of IL 8 and TGF b1
increased significantly with time going on. And at each time
point, their concentrations were higher than those in the air
control group and hyperoxia induced lung injury + SB203580
group (P<0.01). CONCLUSION: Hyperoxia induced lung injury
in new born rats can be relieved by the treatment of SB203580
through blocking the expressions of p38MAPK, then inhibiting the
expression of IL 8 and TGF b1.
【Keywords】 lung/injury; hyperoxia; p38 mitogen
activated protein kinase; IL 8; TGF b1
0 引言
我们在前期研究中发现,大鼠长时间暴露于高氧环境后,p38
2
丝裂素活化蛋白激酶(p38 mitogen activated protein kinase,
p38MAPK)得以激活并介导了急性肺损伤,p38MAPK 特异性抑制剂
SB203580 对这种损伤具有明显的保护作用[1] 但具体的机制尚不 ,
清楚. 有研究表明,白介素 8(interleukin 8, IL 8)和转化
生长因子 b1(transforming growth factor b, TGF b1)均
在高氧肺损伤中发挥了重要作用[2-3]. 我们以 SB203580 处理建立
新生大鼠高氧肺损伤模型,观察其对肺组织 IL 8 和 TGF b1 表达
的影响,探讨临床应用 SB203580 预防和治疗高氧肺损伤的可行性.
1 材料和方法
1.1 材料
出生 12 h 内的 SD 大鼠 160 只(第三军医大学大坪医院实验
动物中心) ,体质量 6~8 g. 兔抗大鼠磷酸化的 p38MAPK 多克隆抗体
(Santa Cruz 公司);Western Blot 使用效价为 1∶500. 生物素化的
羊抗兔 IgG,SABC 复合物及 DAB(武汉博士德公司); p38MAPK 特异性
抑制剂 SB203580(美国 Sigma 公司); IL 8 和 TGF b1 ELISA 检
测试剂盒(美国 Mega 诊断试剂有限公司).
1.2 方法
1.2.1 分组及建模
将大鼠随机分为 4 组:空气对照组、高氧肺损伤组、高氧肺
损伤+SB203580 组及高氧肺损伤+生理盐水组,每组 40 只. 所有高氧
肺损伤组置于常压高氧仓中,氧体积分数>0.95,CO2 体积分数£
0.05;空气对照组置于同一室内,空气中氧体积分数为 0.21. 高氧肺
3
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