《中国康复理论与实践》 ›› 2007, Vol. 13 ›› Issue (08): 736-737.

• 基础研究 • 上一篇    下一篇

地塞米松对实验性博莱酶素致大鼠肺纤维化防治作用观察

肖永久1a; 朱运奎1a; 李继东1a; 哈英娣1b; 刘卫1a; 薛庆亮1a; 钱震1b   

  1. 1.解放军兰州军区兰州总医院a.呼吸内科;b.病理科,甘肃兰州市 730050
  • 收稿日期:2006-07-13 出版日期:2007-08-01 发布日期:2007-08-01

Effect of Dexamethasone on Bleomycin-induced Pulmonary Fibrosis in Rats

XIAO Yong-jiu, ZHU Yun-kui, LI Ji-dong, et al   

  1. The Department of Respiratory Medicine, Lanzhou General Hospital of Lanzhou Command, PLA, Lanzhou 730050, Gansu, China
  • Received:2006-07-13 Published:2007-08-01 Online:2007-08-01

摘要: 目的观察地塞米松对博莱酶素致大鼠肺纤维化的防治作用。方法32只大鼠随机分为对照组(n=8)、治疗组(n=12)和致伤组(n=12),治疗组和致伤组经气管内注射博莱酶素制备肺急性损伤模型,对照组注射蒸馏水。造模后,治疗组每日经腹腔注射地塞米松进行治疗,致伤组及对照组每日给予生理盐水。于不同时期(3d、7d、14d、27d)处死大鼠后进行肺泡灌洗,瑞氏染色细胞分类,肺组织HE染色,测定肺组织胶原总量。结果病理切片显示致伤组大鼠肺泡间隔明显增宽,较多纤维母细胞增生及炎性细胞浸润,后期肺组织实变;治疗组各期病理变化较致伤组明显减轻,且在后期肺泡壁有恢复的倾向。肺泡灌洗液中性粒细胞致伤组和治疗组大鼠在第7天时达到峰值,但治疗组低于致伤组(P<0.05),第14天时明显低于致伤组(P<0.01);肺胶原总量致伤组和治疗组在第14天时达到峰值,但致伤组明显高于对照组(P<0.01),治疗组则明显低于致伤组(P<0.01)。结论地塞米松通过抑制肺部炎性细胞在肺组织中的聚集、浸润,以及纤维细胞增殖导致的胶原分泌增加,有效防治肺纤维化。

关键词: 地塞米松, 肺纤维化, 胶原, 羟脯氨酸检测

Abstract: Objective To investigate the protective and cure effects of dexamethasone on bleomycin-induced pulmonary fibrosis.Methods32 rats were randomly divided into the control group (C-group, n=8), injury group (I-group, n=12) and dexamethasone group (D-group, n=12). The acute pulmonary model was established by intratracheal injection of bleomycin with rats of the I-group and D-group; while rats of the C-group injected with distilled water. After that, rats of the D-group were injected with dexamethasone sodium phosphate in intraperitoneal every day, those of the C-group and I-group were injected with saline. The animals were killed on the 3rd, 7th, 14th, and 27th days after treatment, and tests of bronchoalveolar lavage fluid (BALF), total lung collagen content and lung tissue processing were performed.ResultsPathological evidence of the I-group rats demonstrated that the alveolar compartment companied with massive inflammatory cell invasion and a number of myofibroblast proliferation became more thick. However, lung injury in the D-group rats got better than that in the I-group. Neutrophil percentage achieved peak in both I-group and D-group on the 7th day. But the neutrophil ratio in the D-group was significantly lower than that of the I-group on the 7th day ( P<0.05) and the 14th day ( P<0.01). Total lung collagen content achieved peak on the 14th day both in I-group and D-group, but that of the I-group was significantly higher than that of the C-group ( P<0.01) and the D-group was significantly lower than the I-group ( P<0.01).ConclusionDexamethasone plays a protective and cure role in lung fibrosis by efficiently inhibiting the gather and invasion of neutropils and restraining the increase of collagen secreted by proliferous fibroblasts.

Key words: dexamethasone, pulmonary fibrosis, collagen, hydroxyproline assay