Abstract
In PC12 cells, NGF and other ligands of tyrosine kinase receptors increased the activity of the Rous sarcoma virus (RSV) promoter. IGF-1 stimulated the RSV promoter in SH-SY5Y neuroblastoma cells. This promoter was also activated by oncogenic Ras and Raf in different cell types, and growth factor induction was inhibited by expression of dominant negative forms of ras and raf, showing that its effect is mediated by a Ras- and Raf-dependent mechanism. Therefore, the RSV promoter should not be used in the determination of transfection efficiency in the studies on regulation of gene expression by ligands of tyrosine kinase receptors, ras and raf.
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