TGFB1 and asthma: 1997). Interestingly, studies suggest that TGFβ expression is upregulated in asthmatic lungs (Redington et al. 1997; Vignola et al. 1997; Tillie‐Leblond et al. 1999; Chu et al. 2000). In the lung, TGFβ is involved in airway remodeling (Desmouliere 1995; Doherty and Broide 2007). It has been shown to promote fibroblast to myofibroblast transdifferentiation and to trigger their proliferation (Michalik et al. 2009). Therefore, taken together, these studies suggest that TGFβ is tightly associated with asthma‐related airway remodeling.