TGFB1 and cystic fibrosis: Western blots and RT-PCR results showed that induction of perisotin by HG in CF was suppressed by TGF-β neutralizing antibody, Smad2/3 knockdown (Additional file 2: Fig. S2C, D), rather than PI3K or Akt inhibitors (Additional file 2: Fig. S4C, D).