RESUMEN
Objective To compare the effects of genistein, bosentan, and tadalfil in treatment of monocrotaline-induced pulmonary arterial hypertension (PAH) in rats. Methods Monocrotaline-induced PAH SD-rat model was established by injecting monocrotaline (50 mg/kg) intraperitoneally (n = 48). while the rats in control group (72 = 8) were given normal saline injection. Then all model rats were randomly divided into 6 groups (72=8) according to different drugs given by gavage after 3 weeks; PAH group (PAH rats were treated with normal saline), genistein (G30. G60, G120 groups (PAH rats were treated with genistein 30, 60, 120 mg • kg-1 • d-1, respectively), bosentan group (PAH rats were treated with bosentan 5 mg • kg-1 • d-l), and tadalafil group (PAH rats were treated with tadalafil 0. 5 mg • kg-1 • d-l). After 2 weeks of treatment, survival rate, tricupid regurgitation (TR), pulmonary artery diameter (PAD), mean pulmonary arterial pressure (PAP), acetylcholine (ACh)-induced endothelium dependent relaxation (EDdR), sodium nitroprusside (SNP)-induced endothelium-independent relaxation (EDiR). right ventricular hypertrophy index (RVHI), and lung phathological of rats in each group were compared. Results Compared with the control group, the TR. PAD. mean PAP and RVHI of rats were significantly increased in PAH group (P<0. 05). Compared with the PAH group, the TR and RVHI of rats were significantly decreased in G60 and G120 groups, PAD was significantly decreased in G120 group, mean PAP was significantly decreased in G30, G60 and G120 groups, survival rate was significantlyincreased in G120 group, and endothelium dependent relaxation was significantly improved in G30, G60 and G120 groups, while pulmonary vascular luminal stenosis, wall thickening and vascular smooth muscle cell proliferation were significantly inhibited in G30, G60 and G120 groups (P