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| Item type: | Article | ||||||||||||||||||||||||||
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| Journal or Publication Title: | Transplantation | ||||||||||||||||||||||||||
| Volume: | 79 | ||||||||||||||||||||||||||
| Number of Issue or Book Chapter: | 5 | ||||||||||||||||||||||||||
| Page Range: | pp. 536-42 | ||||||||||||||||||||||||||
| Date: | 2005 | ||||||||||||||||||||||||||
| Institutions: | Medicine > Lehrstuhl für Innere Medizin III (Hämatologie und Internistische Onkologie) | ||||||||||||||||||||||||||
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| Dewey Decimal Classification: | 600 Technology > 610 Medical sciences Medicine | ||||||||||||||||||||||||||
| Status: | Published | ||||||||||||||||||||||||||
| Refereed: | Yes, this version has been refereed | ||||||||||||||||||||||||||
| Created at the University of Regensburg: | Yes | ||||||||||||||||||||||||||
| Item ID: | 14444 |
Abstract
BACKGROUND: Idiopathic pneumonia syndrome (IPS) is a frequently fatal complication of allogeneic bone marrow transplantation (BMT). IPS is associated with elevated bronchoalveolar lavage (BAL) fluid levels of tumor necrosis factor-alpha and lipopolysaccharide, both of which are potent activators of endothelial cells (ECs). EC expression of the adhesion molecule CD54 (intercellular adhesion ...
Abstract
BACKGROUND: Idiopathic pneumonia syndrome (IPS) is a frequently fatal complication of allogeneic bone marrow transplantation (BMT). IPS is associated with elevated bronchoalveolar lavage (BAL) fluid levels of tumor necrosis factor-alpha and lipopolysaccharide, both of which are potent activators of endothelial cells (ECs). EC expression of the adhesion molecule CD54 (intercellular adhesion molecule [ICAM]-1) has been shown to be a major regulator of pulmonary inflammation in various experimental models. METHODS: Using a well-established murine BMT system in which lung injury and graft-versus-host disease (GvHD) are induced by minor histocompatibility antigenic differences between donor and host, the RNase Protection Assay, mice deficient in ICAM-1 expression, and a monoclonal blocking antibody to ICAM, we evaluated the role of the pulmonary vascular expression of CD54 in the development of IPS. RESULTS: Enhanced pulmonary vascular expression of ICAM-1 coincided with the development of IPS. When ICAM-1 -/- mice were used as allogeneic BMT recipients, IPS severity (measured by lung histopathology, BAL cellularity, and cytokine expression) was significantly reduced compared with wild-type controls. Similar results were also observed when wild-type recipients were treated with a monoclonal blocking antibody to ICAM-1. Surprisingly, ICAM-1 had differential effects on leukocyte infiltration into GvHD target organs; ICAM-1 deficiency had no impact on intestinal histopathology, whereas ICAM-1-/- BMT recipients had significantly enhanced hepatic injury. CONCLUSIONS: These data demonstrate that although the expression of ICAM-1 is critical for the development of IPS, different mechanisms of leukocyte recruitment are operative in other GvHD target organs.
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