Elevated levels of transforming growth factor-beta(1) in serum of patients with stable bronchiectasis |
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Authors: | Mak Judith C W Ho Siu P Leung Raymond Y H Ho Pak L Ooi Clara Tipoe George L Yan Christina Ip Mary S M Lam Wah K Tsang Kenneth W T |
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Institution: | Division of Respiratory and Critical Care Medicine, Department of Medicine, The University of Hong Kong, Administration Block, Queen Mary Hospital, Hong Kong SAR, China. |
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Abstract: | Bronchiectasis is a chronic inflammatory and infective airway disease characterized by irreversible dilatation of the bronchi and persistent purulent sputum. Transforming growth factor-beta(1) (TGF-beta(1)) has been found to be increased in the lungs or bronchoalveolar lavage fluid of patients with inflammatory lung diseases. However, little is known on the serum TGF-beta(1) levels in patients with bronchiectasis. We aimed to determine the serum TGF-beta(1) concentrations in 95 patients with stable bronchiectasis (63 women; mean+/-sd age, 58.9+/-14.1 years) and 68 control subjects (23 women; 48.9+/-12.8 years) by ELISA, and to correlate with clinical parameters. The serum TGF-beta(1) levels were significantly higher in bronchiectatic patients compared with control subjects (median range], 1812.5 pg/ml 1226.4-4114.5 pg/ml] vs. 1342.4 pg/ml 940.3-2371.7 pg/ml]; P<0.001). There was, however, no correlation between serum TGF-beta(1) levels with FEV(1) (% predicted), FVC (% predicted), 24h sputum volume, the number of bronchiectatic lung lobes or total white blood cell count (P>0.05). Our findings support previous indications that TGF-beta(1) may contribute to bronchiectatic airway inflammation. Further studies on the potential mechanisms and pathogenesis implications of this elevation should also be pursued in future. |
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