The effects of transforming growth factor-beta (TGF-beta) on the protein synthesis and gene expression of collagen I (CI), III (CIII), IV (CIV) and laminin (LM) in cultured rat mesangial cells (MCs) were examined to determine whether or not TGF-beta could modulate the formation of extracellular matrix (ECM) constituents, employing immunocytochemistry, enzyme-linked immunoadsorbent assay (ELISA) and Northern blotting. Although TGF-beta did not modulate MC proliferation, it induced slight enhancement of immunoperoxidase staining for CIV in the cytoplasm. ELISA demonstrated a significant increase in the amounts of CIV and LM, a tendency for CIII to increase, and a significantly lower amount of CI at 4 days after TGF-beta administration. Northern blotting showed that the mRNA expression displayed different patterns among the 4 matrix components during a 24-hr period. These findings suggest that a single growth factor, TGF-beta, in vitro modulates the synthesis of individual ECM constituents in MCs differently at the level of both genetic expression and protein production. The specific effects of TGF-beta on the increase in amounts of CIV and LM indicate that TGF-beta may contribute to glomerular remodeling and ECM accumulation in various kinds of glomerular injuries.
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