title: Alteration of pulmonary structure by Pseudomonas aeruginosa exoenzyme S.
abstract: Intratracheal administration of purified Pseudomonas aeruginosa exoenzyme S elicited extensive, grossly observable damage in the rat lung within 2 h. Light and electronmicroscopy revealed injury and necrosis of bronchial epithelium, type I pneumocytes and capillary endothelial cells after 1 h; associated haemorrhage, fibrinous exudation and released type II cell lamellar bodies in alveolar lumina after 1-12 h; progressively increasing accumulations of polymorphonuclear leucocytes in the bronchi and alveoli and in alveolar septae (interstitial pneumonia) after 1-12 h; collapse of alveolar septal connective tissue and damage to pulmonary arterioles and venules. Treatment of monolayer cultures of bronchial fibroblasts with purified exoenzyme S elicited vacuolation of the cells with apparent membrane damage as revealed by light and electronmicroscopy. In-vivo production and activity of P. aeruginosa exoenzyme S may be an important pathogenicity determinant in the necrotising lung injury characteristic of P. aeruginosa pneumonia.
mesh_terms: D036002:ADP Ribose Transferases; D000818:Animals; D001427:Bacterial Toxins; D001980:Bronchi / Q000187:drug effects* / Q000648:ultrastructure; D004848:Epithelium / Q000187:drug effects / Q000648:ultrastructure; D005347:Fibroblasts / Q000187:drug effects / Q000648:ultrastructure; D008168:Lung / Q000187:drug effects* / Q000648:ultrastructure; D008297:Male; D008854:Microscopy, Electron; D011065:Poly(ADP-ribose) Polymerases / Q000008:administration & dosage / Q000633:toxicity*; D011550:Pseudomonas aeruginosa / Q000201:enzymology* / Q000472:pathogenicity; D011650:Pulmonary Alveoli / Q000187:drug effects* / Q000648:ultrastructure; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D001427:Bacterial Toxins; D036002:ADP Ribose Transferases; D011065:Poly(ADP-ribose) Polymerases; C444820:exoenzyme S