Purpose. To determine the long-term effects of single, 5-minute exposures to 5-fluorouracil (5FU) and mitomycin-C (MMC) on Tenon's capsule fibroblast migration, growth factor production, growth factor receptor expression, and extracellular matrix (ECM) production. Methods. Monolayer cultures and the overlying growth medium of Tenon's capsule fibroblasts exposed to 5FU (0.25 to 25 mg/ml) or MMC (0.001 to 0.1 mg/ml) were harvested up to 48 days after treatment. The expression of growdi factors and growth factor receptors, including transforming growth factor j3 (TGF/3), basic fibroblast growth factor (bFGF), and epidermal growth factor (EGF), and ECM molecules (collagen type I, collagen type III, and fibronectin) were quantitated at the mRNA and protein levels. The ability of fibroblasts exposed to 5FU and MMC to migrate to fetal calf serum was also investigated up to 48 days after treatment. Results. Control cultures were found to produce the growth factors TGF/3 and bFGF but not EGF. Exposure to 5FU or MMC resulted in an initial significant increase (P < 0.05) in the production of TGF/? and bFGF, with levels then decreasing toward those of controls. Cells exposed to 5FU or MMC exhibited an initial significant decrease (P < 0.05) in the number of TGF/3, bFGF, and EGF growth factor receptors, with subsequent recovery toward control levels by day 48 after treatment
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