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• W2005477943 abstract "Rationale: Patients with idiopathic pulmonary fibrosis (IPF), a progressive disease with a dismal prognosis, exhibit an unexplained disparity of increased alveolar epithelial cell (AEC) apoptosis but reduced fibroblast apoptosis.Objectives: To examine whether the failure of patients with IPF to up-regulate cyclooxygenase (COX)-2, and thus the antifibrotic mediator prostaglandin (PG)E2, accounts for this imbalance.Methods: Fibroblasts and primary type II AECs were isolated from control and fibrotic human lung tissue. The effects of COX-2 inhibition and exogenous PGE2 on fibroblast and AEC sensitivity to Fas ligand (FasL)-induced apoptosis were assessed.Measurements and Main Results: IPF lung fibroblasts are resistant to FasL-induced apoptosis compared with control lung fibroblasts. Inhibition of COX-2 in control lung fibroblasts resulted in an apoptosis-resistant phenotype. Administration of PGE2 almost doubled the rate of FasL-induced apoptosis in fibrotic lung fibroblasts compared with FasL alone. Conversely, in primary fibrotic lung type II AECs, PGE2 protected against FasL-induced apoptosis. In human control and, to a greater extent, fibrotic lung fibroblasts, PGE2 inhibits the phosphorylation of Akt, suggesting that regulation of this prosurvival protein kinase is an important mechanism by which PGE2 modulates cellular apoptotic responses.Conclusions: The observation that PGE2 deficiency results in increased AEC but reduced fibroblast sensitivity to apoptosis provides a novel pathogenic insight into the mechanisms driving persistent fibroproliferation in IPF." @default.
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• W2005477943 date "2010-07-01" @default.
• W2005477943 modified "2023-10-16" @default.
• W2005477943 title "Diminished Prostaglandin E₂Contributes to the Apoptosis Paradox in Idiopathic Pulmonary Fibrosis" @default.
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• W2005477943 doi "https://doi.org/10.1164/rccm.200905-0674oc" @default.
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