OBJECTIVE

2

To study the improving mechanism of Buyang huanwu decoction （BYHW） on idiopathic pulmonary fibrosis （IPF） model rats.

METHODS

2

Ninety-six Wistar rats were randomly divided into blank group， model group， positive control group， and BYHW low-dose， middle-dose and high-dose groups， with 16 rats in each group. Except for the blank group， the IPF model was induced in other groups by intratracheal instillation of bleomycin （5 mg/kg）. Starting from the day of modeling， the blank group and model group were given normal saline （10 mL/kg） intragastrically， while the rats in the positive control group were given dexamethasone solution （5 mg/kg） intragastrically， BYHW low-dose， middle-dose and high-dose groups were treated with BYHW （2.5， 5， 10 g/kg， by crude drug） intragastrically， once a day， for

28 consecutive days. The body mass of rats in each group was measured on days 0， 7， 14， 21 and 28 after modeling. The number of adherent white blood cells in pulmonary veins was observed by a dynamic visualization system. The contents of TNF-α and IL-6 in serum and TNF-α， IL-6， HYP and TGF-β

1

in lung tissue were detected； the protein expression of ZO-1 was also detected. The pathomorphological changes in lung tissue were observed.

RESULTS

2

Compared with the model group， the body weight of rats all increased significantly in BYHW high-dose and middle-dose groups， positive control group， while the number of adherent white blood cells in pulmonary veins was decreased significantly； the contents of TNF-α （except for serum in BYHW middle-dose group） and IL-6 in serum and lung tissue， the contents of HYP and TGF-β

1

in lung tissue were decreased significantly， while the protein expression of ZO-1 in the lung tissue was increased significantly （

P

＜0.05 or

P

＜0.01）. The pathological changes of lung tissue were improved to varying degrees.

CONCLUSIONS

2

BYHW may play anti-pulmonary fibrosis role by improving leukocyte adhesion， anti-inflammatory， anti-fibrosis， and other aspects of pulmonary microcirculation.