TGFB1 and bronchopulmonary dysplasia: The results of ELISA and qRT-PCR displayed that TGF-β, IL-6, and IL-1β in the hyperoxia group were increased compared with the blank group, and TUG1 repressed the upregulations of TGF-β, IL-6, and IL-1β in the serum of BPD mice (all P < 0.01) (Figures 2C,D).