Fig. 1

Postnatal hypoxia resulted in PH. a Comparison of lung/body wet weight ratio after 2 weeks of hypoxia (N = 8–9 per group). b Right ventricular hypertrophy index [RV/(LV + S)] differed between hypoxia and normoxia rats (N = 8–9 per group). c Comparison of right ventricular pressure (RVP) in the two groups (N = 6–7 per group). d HE staining and immunohistochemical staining of lung tissue (N = 5 per group). e Mean alveolar number (MAN) of the two groups (N = 5 per group). f The thickness of pulmonary arterial intima measured by α-SMA (N = 5 per group). g Expression of eNOS and VEGF in the lung (N = 6 per group). *P < 0.05, **P < 0.01 compared to the control group