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Cell Growth & Differentiation, Vol 9, Issue 7 513-522, Copyright © 1998 by American Association of Cancer Research


ARTICLES

Activation of the c-fos serum response element by phosphatidyl inositol 3-kinase and rho pathways in HeLa cells

Y Wang, M Falasca, J Schlessinger, S Malstrom, P Tsichlis, J Settleman, W Hu, B Lim and R Prywes
Department of Biological Sciences, Columbia University, New York, New York 10027, USA.

Many growth factors rapidly induce transcription of the c-fos proto-oncogene. We have investigated the pathways for induction of the c-fos promoter by serum and epidermal growth factor (EGF) in HeLa cells. Induction of the serum response element (SRE) of the c-fos promoter could be split into two parts, one involving the serum response factor-associated ternary complex factor (TCF) factors and the second mediated by core SRE sequences. Serum induction was mediated primarily by the core SRE, whereas EGF used both the TCF and core SRE pathways. Using activated and inhibitory signaling proteins, we found that phosphatidyl inositol 3-kinase (PI3K) and rho family members could mediate activation by serum. Activation by PI3K was mediated by core SRE sequences and was dependent upon rac and rho, suggesting a PI3K-to-rac-to-rho pathway for core SRE activation. The PI3K target Akt was also capable of activating the SRE but functioned through the TCF pathway, suggesting that Akt does not mediate the primary PI3K pathway to the SRE and that Akt is capable of activating TCF family members. Serum and EGF induction of the core SRE was partially inhibited by rho and PI3K inhibitors. The use of these inhibitors demonstrates the complexity of signaling pathways to the SRE and suggests that serum activates rho by PI3K-dependent and -independent pathways.


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Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1998 by the American Association of Cancer Research.