Characterization of Bronchiolitis-obliterans Syndrome (BOS) Following Lung Transplantation

Overview

Chronic organ dysfunction after lung transplantation (BOS) is the most common cause of death in long-term survivors after lung transplantation and refractory to most interventions. Early markers will be established in this project study to overcome the problem of disease recognition when impairment of graft function is already taken place. Long-term longitudinal monitoring in stable recipients of innovative markers of airway inflammation and ventilation and new imaging techniques will define different entities of chronic organ dysfunction after LTx. A database and specimen service unit for further projects will be created. Hypothesis: This project will reveal new markers and imaging tools in recipients who develop BOS after lung transplantation. These tools will allow earlier diagnosis and more accurate monitoring of the disease process. Different patterns of the disease will be characterized.

Chronic organ dysfunction of the lung allograft is the most common cause of death in lung transplant recipients after the first postoperative year and is a major cause of morbidity in the long-term care. It affects every second recipient surviving 5 years after transplantation (Boehler, Estenne 2003). Obliterative bronchiolitis (OB) is the histo-pathological process underlying chronic organ dysfunction after LTx. Bronchiolitis obliterans syndrome (BOS) is the clinical definition of chronic organ dysfunction following lung transplantation (LTx) and refers to a progressive obstructive ventilatory disorder. Staging is performed according to baseline values of forced expiratory volume after LTx (Estenne et al. 2001). Excessive immunosuppression may be deleterious by increasing the risk of infection, thereby triggering innate and adaptive immunity. BOS is progressive in most of the cases with stabilisation in some. Different clinical entities are found according to time of onset, speed of decline in graft function (Jackson et al. 2002), ventilatory patterns, findings on imaging studies (Pakhale et al 2005, Choi et al 2003) and response to macrolides (Gerhardt et al. 2003). Exhaled biomarkers are promising markers of disease activity in pats with BOS (an Muylem 2007, Brugiere et al 2005) Alloimmune-independent and -dependent mechanisms produce injuries and inflammation of epithelial cells and subepithelial structures, leading to aberrant tissue repair (Nicod et al 2006). The triggering of innate immunity by various infections (especially respiratory viruses, Khalifah et al 2004) or chemical injuries (e.g. gastroesophageal reflux or aspiration, Palmer et al. 2000), may lead to the release of danger signals that are able to activate dendritic cells, a crucial link with adaptive immunity. Inflammation can also increase the expression and display of major histocompatibility alloantigens and thus favor the initiation of rejection episodes. The injuries evoke a proinflammatory response and cellular infiltration that leads to excessive fibroproliferation and results in matrix deposition and vascular remodelling. These phenomena may be limited in time and location or may be protracted. Reducing the risk of alloimmune-independent factors may be as important as treating acute episodes of lung rejection. Newpotential therapeutic targets are emerging from the research performed on leukotriene receptors, chemokine receptors, and growth factors. Neutralizing these molecules may reduce the initial mononuclear and polynuclear infiltrates or the subsequent fibroproliferative process and the neovascular changes, feeding this process. (Nicod 2006). Macrolides are promising new agents which partially reverse loss of graft function in a subgroup of patients, which may change definition of BOS in the near future (Gerhardt et al 2003).