Fasudil treatment inhibited the proliferation of HPMECs and HPASMCs. (A) Endothelial cell number per arteriole. (B) Concentration of NO in the serum (n=9 in Sham group, n=14 in PH group, n=18 in PH+F group, and n=11 in F group). (C) Production of NO in HPMECs with different treatments. (D) Representative figures of HPMEC migration. (E) Summarized data of the HPMEC migration rate. Representative data from four independent experiments are shown. (F) Viability of HPASMCs. (G) Summarized data of the percentage of Ki67-positive HPASMCs. (H) Representative figures of the Ki67-positive cell fraction. *P<0.05, **P<0.01 and ***P<0.001. PH, pulmonary hypertension; F, fasudil; HPMECs, human pulmonary microvascular endothelial cells; HPASMCs, human pulmonary artery smooth muscle cells.