TGFB1 and bronchopulmonary dysplasia: Targeting the canonical WNT/β-catenin-TGF-β-PPARγ axis by upregulating PPARγ and downregulating the canonical WNT/TGF-β pathways might be of interest with respect to improving the development of the alveolar stage of BPD at birth and minimizing pulmonary fibrosis later during childhood and adulthood.