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Am. J. Respir. Crit. Care Med., Volume 160, Number 5, November 1999, 1640-1646

Bronchiolitis Obliterans Syndrome after (Heart-)Lung Transplantation
Impaired Antiprotease Defense and Increased Oxidant Activity

JAN HIRSCH, ANDREAS ELSSNER, GERTI MAZUR, KONRAD L. MAIER, IRIS BITTMANN, JÜRGEN BEHR, MARTIN SCHWAIBLMAIR, HERMANN REICHENSPURNER, HEINER FÜRST, JOSEF BRIEGEL, and CLAUS VOGELMEIER, for the Munich Lung Transplant Group

Division for Pulmonary Diseases, Department of Internal Medicine I, Institute for Pathology, Department of Heart Surgery, Department of Surgery, Department of Anesthesiology, Ludwig-Maximilians-University of Munich; and the Institute for Inhalation Biology, GSF-National Research Center for Environment and Health, Neuherberg/Munich, Germany

Increased numbers of neutrophils are a common finding in bronchoalveolar lavage fluid (BALF) samples obtained from patients after (heart-)lung transplantation [(H)LTX]. Since proteases and reactive oxygen species secreted by neutrophils are capable of causing substantial damage to the lung tissue if not counterbalanced by the antiprotease and antioxidant screen, we hypothesized that neutrophil products may play a role in the development of obliterative bronchiolitis (OB). A total of 72 BALF samples obtained from 33 patients after (H)LTX were evaluated. Sixteen of these patients were suffering from bronchiolitis obliterans syndrome (BOS) at the time of bronchoalveolar lavage (BAL). As a control, BALF samples from 17 healthy volunteers were analyzed. Anti-neutrophil elastase (NE) activity was quantified by a titration assay. Concentrations of alpha 1-protease inhibitor (API), secretory leukocyte protease inhibitor (SLPI), NE-API complex, and myeloperoxidase (MPO) were measured by ELISA. Oxidized methionine [Met(O)] was quantified by high-performance liquid chromatography (HPLC). Epithelial lining fluid (ELF) from patients suffering from BOS showed significantly increased neutrophil counts, significantly elevated concentrations of NE-API complex and Met(O), and a significant decrease in the concentration of SLPI. Furthermore, a trend toward an increased NE activity and MPO concentration was observed. These findings suggest that neutrophils may be involved in the development of BOS. Hirsch J, Elssner A, Mazur G, Maier KL, Bittmann I, Behr J, Schwaiblmair M, Reichenspurner H, Fürst H, Briegel J, Vogelmeier C for the Munich Lung Transplant Group. Bronchiolitis obliterans syndrome after (heart-)lung transplantation: impaired antiprotease defense and increased oxidant activity.




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