INTRODUCTION: In the pathogenesis of diffuse parenchymal lung diseases (DPLDs), growth factors, including transforming growth factor beta1 (TGF-beta1), are responsible for cell proliferation, apoptosis, chemotaxis, and angiogenesis, and also for the production and secretion of some components of the extracellular matrix. OBJECTIVES: The aim of the study was to evaluate correlations in DPLDs between TGF-beta1 levels in bronchoalveolar lavage (BAL) fluid and high-resolution computed tomography (HRCT) score. PATIENTS AND METHODS: The study was performed in 31 DPLD patients in whom a selection of lung segments with high and low intensity of abnormalities was estimated by HRCT score. All patients underwent BAL with TGF-beta1 measured by an enzyme immunoassay in BAL fluid and video-assisted thoracic surgery lung biopsy from both selected segments. RESULTS: All 31 patients were diagnosed, and based on histopathology, they were classified into 2 groups: idiopathic interstitial pneumonia (usual interstitial pneumonia - 12, nonspecific inter stitial pneumonia - 2, cryptogenic organizing pneumonia - 2, and desquamative interstitial pneumonia - 1) and granulomatous disease (sarcoidosis - 7, extrinsic allergic alveolitis - 5, and histiocytosis X - 2). The final analysis was performed in 28 patients who showed nonhomogenous distribution on HRCT. TGF-beta1 levels in BAL fluid were significantly higher in the areas with high intensity of abnormalities assessed by HRCT score (P = 0.018, analysis of variance). These levels were not different between the groups, but a trend towards higher levels in idiopathic inter stitial pneumonia was observed. CONCLUSIONS: The results confirm that TGF-beta1 may be a good but not specific marker of fibrosis in DPLDs. A significant positive correlation between TGF-beta1 levels in BAL fluid and the HRCT score was observed.
INTRODUCTION: In the pathogenesis of diffuse parenchymal lung diseases (DPLDs), growth factors, including transforming growth factor beta1 (TGF-beta1), are responsible for cell proliferation, apoptosis, chemotaxis, and angiogenesis, and also for the production and secretion of some components of the extracellular matrix. OBJECTIVES: The aim of the study was to evaluate correlations in DPLDs between TGF-beta1 levels in bronchoalveolar lavage (BAL) fluid and high-resolution computed tomography (HRCT) score. PATIENTS AND METHODS: The study was performed in 31 DPLD patients in whom a selection of lung segments with high and low intensity of abnormalities was estimated by HRCT score. All patients underwent BAL with TGF-beta1 measured by an enzyme immunoassay in BAL fluid and video-assisted thoracic surgery lung biopsy from both selected segments. RESULTS: All 31 patients were diagnosed, and based on histopathology, they were classified into 2 groups: idiopathic interstitial pneumonia (usual interstitial pneumonia - 12, nonspecific inter stitial pneumonia - 2, cryptogenic organizing pneumonia - 2, and desquamative interstitial pneumonia - 1) and granulomatous disease (sarcoidosis - 7, extrinsic allergic alveolitis - 5, and histiocytosis X - 2). The final analysis was performed in 28 patients who showed nonhomogenous distribution on HRCT. TGF-beta1 levels in BAL fluid were significantly higher in the areas with high intensity of abnormalities assessed by HRCT score (P = 0.018, analysis of variance). These levels were not different between the groups, but a trend towards higher levels in idiopathic inter stitial pneumonia was observed. CONCLUSIONS: The results confirm that TGF-beta1 may be a good but not specific marker of fibrosis in DPLDs. A significant positive correlation between TGF-beta1 levels in BAL fluid and the HRCT score was observed.
Authors: Radoslav Matěj; Magdalena Smětáková; Martina Vašáková; Jana Nováková; Martina Sterclová; Jaromír Kukal; Tomáš Olejár Journal: Exp Ther Med Date: 2014-06-11 Impact factor: 2.447