The study of Yangyinyiqi mixture anti bleomycin-induced pulmonary fibrosis on rats by intervening matrix metalloproteinase-9 and tissue inhibitors of matrix metalloproteinases-1

To investigate effectsof Yangyinyiqi Mixture on pulmonary fibrosis caused by bleomycin. SD ratswere divided randomly into: model group(distilled water,1 mL·0.1 kg-1), dexamethasone acetate group(dexamethasone acetate, the dosage was reduced gradually), low-dose group(Yangyinyiqi Mixture, 11 g·kg-1), moderate-dose group(Yangyinyiqi Mixture, 22 g·kg-1), high-dose group (Yangyinyiqi Mixture, 44 g·kg-1) and control group(distilled water, 1 mL·0.1 kg-1). Yangyinyiqi Mixture and dexamethasone acetate were intragastrically administrated. Lung tissue was collected for histopathological examination. Compared with control group, collagen markedly increased andHYP content significantly increased on 7th day in model group (p<0.01). On 28th day, collagen was diffusely deposited, alveolar was destroyed, and HYP content significantly increased (p<0.01). Compared with model group, bleomycin-induced suffering injury caused MMP-9 expression levels to rapidly increase (7and 14 days, p<0.01). TIMP-1 markedly increased (7and 14 days, p<0.01) and stayed at a high levelto28th day. Yangyinyiqi Mixture exerted an effect against pulmonary fibrosis, which could involved prevention of collagen deposition through inhibitingMMP-9 and TIMP-1 expression.