求翻译：Even if infiltrating mast cells in fibrotic lung disorders represent just a secondary step in the chain of pathophysiological events, mast cell mediators such as tryptase and chymase may still have an important role in the acceleration of the fibrotic response through stimulation of cell growth and matrix deposition. Tryptase can induce proliferation of fibroblasts derived from fetal and adult human lung parenchyma.13 Chymase activity is increased in bleomycin是什么意思？

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