吸入布地奈德对幼年大鼠气道重塑的影响(1)
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【摘要】目的:探讨吸入布地奈德对幼年大鼠哮喘气道重塑的影响。方法:幼年SD大鼠随机分为模型组、对照组、布地奈德组,每组8只,采用HE染色和计算机图像分析系统观察测定支气管壁及平滑肌面积,应用样本碱水解法测定羟脯氨酸含量。结果:(1)模型组Wat/Pbm及Wam/Pbm均较对照组增加,差异有显著性(P<0.01),布地奈德组Wat/Pbm及Wam/Pbm与模型组比较明显减轻 (P<0.05);(2) 模型组羟脯氨酸含量高于对照组(P<0.01),布地奈德组羟脯氨酸含量较模型组明显减少(P<0.01)。结论:早期应用布地奈德,能显著抑制气道壁平滑肌的增厚、胶原沉积。
【关键词】哮喘;气道重塑;幼年大鼠;布地奈德
【中图分类号】R562.25 【文献标识码】A 【文章编号】1008-6455(2011)12-0076-02
The effect of budesonide to asthmatic airway remodeling rat
Wei Bing Shang Yunxiao Zhang Miao2 et al
【Abstract】Objective:To explore the effect of the budesonide to asthmatic airway remodeling rat. Methods:SD rat were divided into three groups, model group, control group and budesonide treatment group, 8 each group. HE staining and image analysis were used to measure Wat/Pbm and Wam/Pbm to compare bronchial wall and smooth muscle area in defferent groups and hydroxyproline content were determinated in different groups. Results:1 The Wat/Pbm and Wam/Pbm in model group were all increased than in control group, the differences between groups were statistically significant (P<0.01); The Wat/Pbm and Wam/Pbm in budesonide treatment group decreased than in model group, the differences between groups were statistically significant (P<0.05);2 hydroxyproline content in model group increased than in control group (P<0.01), but which in budesonide treatment group decreased than in model group (P<0.01). Conclusion:Early budesonide applicated earlier can significantly inhibit the airway smooth wall thickening and collagen deposition.
【Key words】Asthma;Airway remolding; Young rats; Budesonide
起初人们认为只有重症、长期哮喘患者才会引起气道重塑,但近年研究发现,哮喘呼吸道组织结构的改变不仅存在于重型哮喘,而且轻型哮喘也存在不同程度的气道重塑的组织学改变。在患者就医并被初次诊断为哮喘时,其气道重塑的特点与慢性长期哮喘并无明显差别。儿童与成人哮喘的网状基底膜厚度相似〖1,2〗。提示气道重塑在哮喘的发病机制中起重要作用,哮喘气道重塑的机制及治疗已成为当前国内、外研究的重点,气道重塑在儿童哮喘中的作用也不容忽视。目前长期控制哮喘发作最常用的药物是吸入性糖皮质激素,其对气道炎症的抑制作用已毋庸置疑,但在气道重塑中的作用意见尚不一致。本实验旨在探讨吸入性糖皮质激素在幼年哮喘气道重塑的作用。
1 材料与方法
1.1 动物及分组:健康幼年雌性SD大鼠,体重60~80g,购于中国医科大学实验动物中心。根据随机化分配原则,将24只大鼠按体重编号,采用随机排列表法分为模型组、对照组、布地奈德组共3组,每组8只。
1.2 致敏、激发程序:模型组大鼠分别于第1天、第8天腹腔注射抗原致敏液1m1(含卵蛋白100mg、氢氧化铝100 mg、灭活的百日咳杆菌5×109个)。对照组注射等体积生理盐水。从第15天开始,将大鼠置于一自制密闭容器(20cm×20cm×20cm)中,以1%卵蛋白超声雾化吸入,每次30min,每周三次。对照组用生理盐水代替卵蛋白。布地奈德组每次激发前30min,给予布地奈德混悬液0 64 mL /kg,加生理盐水至2 ml,放入百瑞PRONEB压缩吸入机驱动雾化吸入。共8w。
1.3 标本采集与检测:每组大鼠于末次激发24h内腹腔注射1%戊巴比妥钠40mg/Kg麻醉,打开胸腔,右肺中叶置于4%多聚甲醛中用于HE染色,找到完整的支气管横截面,采用图像采集系统(MetaMorph/BX41,日本)采集图像,测定支气管基底膜周径(Pbm)、总管壁面积(WAt)及平滑肌面积(WAm ),并用Pbm将测量值标化,分别以WAt/ Pbm,及WAm/ Pbm代表相应管壁层的厚度。剩余肺组织应用样本碱水解法测定羟脯氨酸含量。
1.4 统计学分析:应用SSPS13 ......
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