Malignant transformation by H‐ras results in ...

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Title Malignant transformation by H‐ras results in aberrant regulation of ribonucleotide reductase gene expression by transforming growth factor‐β1
Author(s) Robert A. R. Hurta, J. A. Wright
Journal Journal of Cellular Biochemistry
Date 1995
Volume 57
Issue 3
Start page 543
End page 556
Abstract Ribonucleotide reductase is a key rate-limiting and regulatory step in DNA synthesis and plays a crucial role in the coordination of DNA synthesis, DNA repair, and cell proliferation. The present study demonstrates a link between alterations in TGF-beta(1) regulation during malignant conversion and the expression of ribonucleotide reductase. H-ras-transformed mouse 10T1/2 cell lines exhibiting malignant potential were examined for possible TGF-beta(1)-mediated alterations in ribonucleotide reductase expression. Selective induction of ribonucleotide reductase gene expression occurred, since only H-ras-transformed highly metastatic cells exhibited marked elevations in ribonucleotide reductase expression, whereas nontransformed normal 10T1/2 cells were unaffected by TGF-beta(1) treatment. These changes occurred without any detectable modifications in DNA synthesis rates, suggesting that these changes were regulated by a novel mechanism independent of the S-phase of the cell cycle. Furthermore, this TGF-beta(1)-mediated regulation of ribonucleotide reductase expression was shown to occur through an autocrine mechanism. TGF-beta(1)-modulated regulation of ribonucleotide reductase expression requires de novo protein synthesis and involves, at least in part, transcriptional and post-transcriptional events. Furthermore, evidence is presented to suggest a possible role for protein kinase C-mediated events, protein phosphatases, and G-protein-coupled events in the TGF-beta(1)-mediated regulation of ribonucleotide reductase expression in H-ras-transformed malignant cells. TGF-beta(1) regulation of ribonucleotide reductase in highly malignant cells appears to be complex and multifaceted and constitutes an integral part of an altered growth regulatory program. (C) 1995 Wiley-Liss, Inc.

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