吸入糖皮质激素对大鼠肺纤维化的干预作用及bFGF表达的影响

目的:研究吸入糖皮质激素对大鼠肺纤维化模型的干预作用及可能的机制。方法:雌性Wistar大鼠40只,体重180～250g,按照随机数字表法将大鼠随机分为4组(n=10):①对照组(C组);②模型组(M组);③布地奈德组(B组);④地塞米松组(D组)。M组、B组、D组给大鼠气管内吸入博莱霉素(5mg/kgbw,8mg)复制肺纤维化模型,C组气管内吸入同等剂量的生理盐水作对照,B组于次日给予雾化吸入等效剂量布地奈德,D组于次日腹腔内注射地塞米松。上述各组均于注药后第1、4周各宰杀5只。通过苏木素-伊红染色观察肺泡炎、Masson胶原染色观察肺纤维化、用免疫组化及酶联免疫吸附测定(ELISA)法检测bFGF蛋白在大鼠肺组织,血清及肺泡灌洗液(BALF)的表达。结果:1、4周时M组表现为肺泡炎及肺间质炎症,B组、D组肺泡炎及肺纤维化程度较M组减轻。1、4周时血清、肺组织、BALF中M组的bFGF表达高于C组(P0.01),B、D组低于M组(P0.01)。结论:吸入糖皮质激素可减轻博莱霉素诱导的肺纤维化,其抗纤维化作用的机制与抑制bFGF表达有关。

Inhalation of glucocorticosteroid in the rat model of bleomycin-induced pulmonary fibrosis and its impact on the expression of basic fibroblast growth factor

Objective： To study the effect of inhalation of glucocorticoid on bleomycin-induced pulmonary fibrosis in rats and its possible mechanism. Methods： Pulmonary fibrosis was induced in Wistar rats by intratracheal instillation of bleomyein （group M, group B, groupD）. Group B inhaled glucoeorticoid daily from the next day of received bleomyein. Group D intraperitoneal injection glucocorticoid daily from the next day of received bleomycin. Normal controls received normal saline both intratracheally. Five rats in each group were killed at 1, 4 week after intratracheal instillation. Histological changes of the lungs were evaluated by HE,Masson trichrome stain. Lung expression of bFGF proteins was assessed by immunohistochemistry and the level of bFGF protein in serum and BALF was further measured by ELISA. Results： Pulmonary fibrosis of group M was higher than that of group C, pulmonary fibrosis of group B, D was lower than that of group M at 1, 4 week. bFGF in group M was higher than that in group C, bFGF in group B,D was lower than that in group M in lung, serum and BAIY＇ on 1, 4 week. Conclusion： Inhalation of glueocorticosteroid alleviates bleomyein-induced pulmonary fibrosis in rats. The mechanism may be related to the changes that bFGF is degrade or prevent it step up.