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Study objective: The aim of this study was to examined whether transforming growth factor (TGF)-beta(3) induces pleurodesis in rabbits and collagen production by human pleural mesothelial cells in vitro. Design: A combined animal and in vitro study. Methods: TGF-beta(3) was injected intrapleurally in rabbits at the following doses: 0.167 mu g, 0.5 mu g, 1.67 mu g, and 5 mu g (five rabbits per group). The rabbits were killed 14 days following injection, and pleurodesis was graded from 1 (none) to 8 (complete symphysis). Pleural mesothelial cell cultures were established from benign pleural effusions and treated with TGF-beta(3) for 48 h at the following doses: 0 (control), 5 ng/mL, 1.5 ng/mL, 5 ng/mL, and 15 ng/mL and 50 ng/mL (two independent experiments). Collagen I messenger RNA (mRNA) expression was quantified using real-time polymerase chain reaction. Results: The median pleurodesis score was 5 (interquartile range [IQR], 4.5) in the 0.167-mu g group, 6 (IQR, 5) in the 0.5-mu g group, 8 (IQR, 1) in the 1.67-mu g group, and 8 (IQR, 0.5) in the 5-mu g group (p = 0.012). Higher TGF-beta(3) doses induced the production of significantly more pleural fluid than the lower doses (p = 0.005). The pleural fluid induced by higher doses contained and lactate dehydrogenase levels significantly lower numbers of nucleated cells (p = 0.014) (p = 0.013) than the pleural fluid induced by lower doses of the agent. TGF-beta(3) markedly enhanced collagen I mBNA expression by the human pleural mesothelial cells. This effect peaked at 5 ng/mL TGF-beta(3). With this dose of TGF-beta(3), the collagen I mRNA expression was increased 16-fold over control levels. Conclusion: TGF-beta(3) causes a dose-dependent pleurodesis when administered intrapleurally in rabbits, and induces collagen messenger RNA synthesis from human pleural mesothelial cells. |
