AGT and cystic fibrosis: A/D/N alone also had no effect in pro-collagen I protein levels in CF after sI/R, but joint administration with angiotensin II restored the production of pro-collagen I induced by this peptide, in comparison to normoxic conditions (p < 0.05), and to cells under sI/R treated with angiotensin II (p < 0.01; Figure 5C).