Abstract
Previous studies have shown that v-Jun accelerates G1 progression and enables cells to sustain S phase entry in the absence of serum growth factors. Since growth factor-dependent ERK MAP kinase signalling plays an important role in regulating the G1/S transition, we investigated whether aberrant ERK regulation might contribute to cell cycle deregulation by v-Jun. Contrary to expectation, we find that cells transformed by v-Jun exhibit a profound reduction in the basal level of active, dual-phosphorylated ERK. In addition, ERK becomes refractory to stimulation by a subset of agonists including serum, LPA, and EGF, but remains partially responsive to the phorbol ester, TPA. Biochemical analysis indicates that these defects are attributable to a combination of inefficient signal propagation between Ras and Raf within the ERK pathway and increased tonic deactivation by MAP kinase phosphatases. Taken together, these results demonstrate that cell transformation by v-Jun induces alterations in cell physiology which antagonize ERK signalling at multiple levels. The potential significance of this phenotype for oncogenesis by v-Jun is discussed.
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Acknowledgements
The authors are grateful to F Mackenzie for the MKP-1 antiserum, to PK Vogt for RCAS-hER and RCAS Δv-JunER, to W Kolch and A Dhillon for reagents and advice on Raf kinase assays, and to JA Wyke and V Cleghon for comments on the manuscript. This work was supported by the UK Cancer Research Campaign (CRC) (now Cancer Research UK).
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Black, E., Walker, M., Clark, W. et al. Cell transformation by v-Jun deactivates ERK MAP kinase signalling. Oncogene 21, 6540–6548 (2002). https://doi.org/10.1038/sj.onc.1205851
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DOI: https://doi.org/10.1038/sj.onc.1205851
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