TRPC1 and pulmonary arterial hypertension: By using the Lipofectamine Transfection Reagent, this study tests the hypothesis that siRNA may effectively deplete TRPC1 protein expression, thereby suppressing hypoxia-induced PAH in a murine model based on the results of our previous study that highlighted the important roles of TRPC1 and TRPC6 in hypoxia-induced PAH [21].