Abstract
Confluent 3T3-L1 preadipocytes differentiate to adipocytes in the presence of insulin, dexamethasone, and isobutylmethylxanthine (IDI). A transient increase of DNA synthesis is induced in 3T3-L1 cells 18 h after addition of IDI, followed by an arrest in the G1 phase of the cell cycle. Growth arrested cells express the proto-oncogene c-myc and the gene for the CCAAT/enhancer binding protein (C/EBPα) between day 2 and 5. While c-Myc is strongly implicated in cell proliferation, C/EBPα is a differentiation-specific transcription factor with anti-proliferative activity. Here we have characterized the cell cycle arrest in differentiating 3T3-L1 cells. Arrested cells express the Cdk inhibitors p21 and p27, but, at the same time, show hyperphosphorylation of Rb and expression of the E2F-regulated thymidine kinase gene. The addition of new serum to arrested cells resulted in cyclin A expression and Cdk2 activity, but not in DNA synthesis. Simian virus 40 large tumor antigen (LTAg) is a potent mitogen. The mutant LTAg-K1, deficient in binding of pocket proteins and unable to induce DNA synthesis in serum-starved 3T3-L1 cells, efficiently induced DNA synthesis in differentiating 3T3-L1 cells. This indicates that pocket proteins are probably not involved in the control of the cell cycle arrest during 3T3-L1 cell differentiation. Our data suggest that the differentiation-specific cell cycle block in 3T3-L1 cells is resistant to high levels of c-Myc, inactivation of pocket proteins, upregulation of cyclin A levels, and Cdk2 activation, but can be abolished by a function of LTAg that is independent of binding to pocket proteins.
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Acknowledgements
We thank Drs C Sherr and P Jansen-Dürr for cyclin probes, W Kölch, C Karreman, F Kohlhuber, C Hall and T Müller for discussion and critical reading of the manuscript. Supported by the Deutsche Forschungsgemeinschaft (SFB190: Mechanismen und Faktoren der Genaktivierung), Deutsche Krebshilfe, European Union and Fonds der Chemischen Industrie.
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Reichert, M., Eick, D. Analysis of cell cycle arrest in adipocyte differentiation. Oncogene 18, 459–466 (1999). https://doi.org/10.1038/sj.onc.1202308
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DOI: https://doi.org/10.1038/sj.onc.1202308
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