The ITGA5 mRNA levels were also tested and found to be slightly, but not significantly changed following 24 h (fold change of IPF-SN vs. control: 1.1 ± 0.07 and 0.94 ± 0.05 for plastic and FN, respectively, N = 7). This evidence concerns the gene FN1 and idiopathic pulmonary fibrosis.