Abstract
The effects of HGF on albumin gene expression in HepG2 human hepatoma cells and rat hepatocytes were investigated. HGF reduced the levels of albumin mRNA in HepG2 cells but the level was augmented in rat hepatocytes. By the transfection assay, HGF stimulated albumin promoter activity but repressed alpha-fetoprotein (AFP) enhancer activity regulating both AFP and albumin promoters in HepG2 cells. In contrast, HGF stimulated albumin promoter and AFP enhancer activities in rat hepatocytes. These results suggest that HGF elicits diverse responses of albumin gene expression in HepG2 cells and rat hepatocytes through the different biological actions on AFP enhancer in these cells.
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