FAS and idiopathic pulmonary fibrosis: The MMP inhibitor reverses IPF-lung myofibroblast resistance to cell death. It has been previously reported by us [42] and others [45] that normal lung myofibroblasts, but not those from fibrotic lungs in bleomycin-treated mice and in humans with IPF, are susceptible to apoptosis induced by Fas agonists and immune T cells.