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Culturing human fibroblasts in a three-dimensional collagen matrix leads to a reduction of collagen I by more than 90%, both on the level of mRNA steady-state as well as protein. In order to differentiate changes in de novo transcription and posttranscriptional control, nuclear run on assays and pulse/chase experiments determining mRNA stability were used. Our results indicate that de novo transcription...
Epidermal growth factor (EGF) induces fibronectin (FN) and FN mRNA in rat liver epithelial cells, under conditions where the factor also induces the cells to migrate. Newly synthesized protein is secreted into the medium and deposited as substratum-bound extracellular matrix. The levels of mRNA and the amount of protein synthesized are not influenced by cyclic AMP or dexamethasone, factors that have...
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