HIF1A and asthma: In the present study, Vit D treatment enhanced Notch1–HIF‐1α expression in lung tissue, as well as accelerated autophagy, reduced airway hyperreactivity, and alleviated airway inflammation and remodeling; these findings indicated that facilitating Notch1–HIF‐1α expression might be an important target for Vit D‐mediated regulation of autophagy during treatment of RSV‐induced asthma.