机构地区:[1]北京呼吸疾病研究所北京市呼吸和肺循环疾病实验室首都医科大学附属北京朝阳医院呼吸与危重症医学科,100020
出 处:《中华医学杂志》2012年第48期3429-3433,共5页National Medical Journal of China
基 金:国家科技支撑计划课题(2012BAl05800)
摘 要:目的观察蚓激酶雾化吸入是否减轻博来霉素诱发的大鼠肺纤维化及其机制。方法健康雄性sD大鼠72只,随机分为对照组、博来霉素组、蚓激酶组。博来霉素组和蚓激酶组用博来霉素制备肺纤维化模型,对照组以生理盐水代替博来霉素。制模后第1天起,蚓激酶组每天1次雾化吸入蚓激酶,博来霉素组及对照组吸入等量的生理盐水。第7、14、28天分别处死3组大鼠各8只,行肺组织常规病理及免疫组化检查;测定肺组织匀浆羟脯氨酸含量;测定肺组织匀浆及血浆尿激酶型纤溶酶原激活物(u-PA)、组织型纤溶酶原激活物(t-PA)、纤溶酶原激活物抑制因子1(PAl.1)含量。结果与博来霉素组相比,蚓激酶组肺泡炎和纤维化程度减轻,肺转化生长因子.p,(TGF.B,)表达减少(P〈0.01)。蚓激酶组与博来霉素组相比,第7、14、28天肺组织羟脯氨酸分别为(5.8±2.5)比(9.6±1.3)、(6.7±1.4)比(9.7±1.5)、(7.5±1.2)比(9.7±1.4)mg/L(均P〈0.01);第7、14天肺组织匀浆u—PA含量分别为(1.04±0.36)比(0.72±0.11)、(0.90±0.09)比(0.75±0.08)μg/L,第14、28天血浆U-PA分别为(0.32±0.04)比(0.25±0.02)、(0.36±0.05)比(0.28±0.04)μg/L(均P〈0.05);第7、14、28天肺匀浆t-PA分别为(4.70±0.87)比(3.01±0.62)、(5.72±0.37)比(3.00±0.51)、(6.73±1.12)比(3.18±0.38)“g/L,血浆t—PA分别为(3.40±0.36)比(1.79±0.38)、(3.17±0.37)比(2.18±0.17)、(3.85±0.56)比(2.80±1.06)μg/L(均P〈0.01);肺匀浆PAI-1分另0为(6.04±0.81)比(8.52±1.01)、(6.78±0.81)比(9.81±1.73)、(7.63±0.99)比(11.44±2.54)μ/L,血浆PAl-1分别为(4.82±0.42)比(6.89±0.84)、(5.73± Objective To explore the effects of aerosolized earthworm fibrinolytic enzyme (EFE) on bleomycin-induced pulmonary fibrosis in rats. Methods A total of 72 male SD rats were divided randomly into 3 groups of bleomycin (BLM) group with intratracheal BLM (5 mg/kg), control group with the same dose of normal saline, then after both receiving aerosolization of normal saline once daily instead of EFE, EFE group with EFE (2500 U/kg) by aerosolization once daily after BLM instillation. Lung histopathology, immunohistochemistry for transforming growth factor [31 (TGF-~i) , lung hydroxyproline contents, levels of urokinase PA (uPA), tissue plasminogen activator (tPA) and PA inhibitor1 (PAI-1) in lung and blood were observed at Days 7, 14 and 28 of experiment, respectively. Results Compared with BLM group, pulmonary fibrosis improved and the TGF-[31 expression of lung tissue decreased ( P 〈 0. 01 ). Hydroxyproline content of lung tissue decreased in EFE group compared with BLM group ( ( 5.8± 2. 5 ) vs (9.6 ±1.3), (6.7±1.4) vs (9.7±1.5), (7. 5±1.2) vs (9.7 ± 1.4)mg/L, P〈O. 01). Compared with BLM group, the uPA levels of lung were elevated in EFE group at Days 7 and 14 ( (1.04 +0. 36) vs (0. 72 ±0. 11 ), (0. 90 ± 0. 09) vs (0. 75± 0.08) g/L, P 〈 O. 05 ). Moreover, the plasma levels uPA of increased at Days 14 and 28 ( (0. 32 ±0. 04) vs (0.25 ±0. 02), (0. 36 ±0.05) vs (0. 28 ±0. 04) μg/L, P 〈 O. 05 ). Consistently, compared with BLM group, the tPA levels of lung increased in EFE group ((4.70±0.87) vs (3.01 ±0.62), (5.72 ±0.37) vs (3.00 ± 0.51), (6.73 ± 1.12) vs (3.18 ±0. 38) txg/L, P 〈 0. O1 ) and the plasma levels of tPA also increased ( ( 3.40 ± 0. 36 ) vs (1.79±0.38), (3.17±0.37) vs (2. 18±0. 17), (3.85±0.56) vs (2.80±1.06)μg/L, P〈0.01). However, compared with BLM group, the PAI-1 levels of lung decreased in EFE group ( �
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