title: The pathogenesis of chronic hypersensitivity pneumonitis in common with idiopathic pulmonary fibrosis: expression of apoptotic markers.
abstract: Previous studies showed that apoptotic epithelial cells were involved in the pathogenesis of idiopathic pulmonary fibrosis (IPF)/usual interstitial pneumonia (UIP); however, little is known about apoptosis in chronic hypersensitivity pneumonitis (HP). This study was performed to examine whether apoptosis has a role in chronic HP. We performed immunohistochemical studies for p53, p21, Fas, Fas ligand, and terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate-biotin nick-end labeling methods on surgical lung specimens. The expression of Fas and Fas ligand was up-regulated in UIP-like lesions compared with nonspecific interstitial pneumonia (NSIP)-like lesions. The expression of p53 and p21 on epithelial cells increased significantly in UIP-like lesions compared with fibrotic NSIP-like lesions and in fibrotic NSIP-like lesions compared with normal lung tissues. These results confirm that apoptotic epithelial cells are present in chronic HP as seen in IPF. Augmented epithelial apoptosis may contribute much more to UIP-like lesions than to NSIP-like lesions in chronic HP.
authors.affiliation: Department of Integrated Pulmonology, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Torahiko
authors.initials: T
authors.lastname: Jinta
authors.forename: Yasunari
authors.initials: Y
authors.lastname: Miyazaki
authors.forename: Masato
authors.initials: M
authors.lastname: Kishi
authors.forename: Takumi
authors.initials: T
authors.lastname: Akashi
authors.forename: Tamiko
authors.initials: T
authors.lastname: Takemura
authors.forename: Naohiko
authors.initials: N
authors.lastname: Inase
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Yoshizawa
mesh_terms: D000542:Alveolitis, Extrinsic Allergic / Q000473:pathology*; D017209:Apoptosis / Q000502:physiology*; D001716:Bird Fancier's Lung / Q000473:pathology; D053222:Fas Ligand Protein / Q000032:analysis; D006801:Humans; D054990:Idiopathic Pulmonary Fibrosis / Q000473:pathology*; D008168:Lung / Q000473:pathology; D016159:Tumor Suppressor Protein p53 / Q000032:analysis; D019014:fas Receptor / Q000032:analysis; D054462:p21-Activated Kinases / Q000032:analysis
chemical_list: C491901:FAS protein, human; D053222:Fas Ligand Protein; D016159:Tumor Suppressor Protein p53; D019014:fas Receptor; D054462:p21-Activated Kinases