Abstract
cDNA microarray hybridization was used in an attempt to identify novel genes participating in cellular responses to prolonged hypoxia. One of the identified novel genes, designated Hi95 shared significant homology to a p53-regulated GADD family member PA26. In addition to its induction in response to prolonged hypoxia, the increased Hi95 transcription was observed following DNA damage or oxidative stress, but not following hyperthermia or serum starvation. Whereas induction of Hi95 by prolonged hypoxia or by oxidative stress is most likely p53-independent, its induction in response to DNA damaging treatments (γ- or UV-irradiation, or doxorubicin) occurs in a p53-dependent manner. Overexpression of Hi95 full-length cDNA was found toxic for many types of cultured cells directly leading either to their apoptotic death or to sensitization to serum starvation and DNA damaging treatments. Unexpectedly, conditional overexpression of the Hi95 cDNA in MCF7-tet-off cells resulted in their protection against cell death induced by hypoxia/glucose deprivation or H2O2. Thus, Hi95 gene seems to be involved in complex regulation of cell viability in response to different stress conditions.
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Acknowledgements
We are grateful to H Ovadia and R Lecker for performance of the MCAO model in rats, and to A Rosenbluh for the reading and correction of the manuscript. We also want to thank E Berent, L Novak, A Bar-On, Y Moshel and N Alima for excellent technical assistance and Mitsubishi-Tokyo Pharmaceuticals Inc. for support. This work was supported by grants of Quark Biotech Inc to PM Chumakov and AV Gudkov.
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Budanov, A., Shoshani, T., Faerman, A. et al. Identification of a novel stress-responsive gene Hi95 involved in regulation of cell viability. Oncogene 21, 6017–6031 (2002). https://doi.org/10.1038/sj.onc.1205877
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DOI: https://doi.org/10.1038/sj.onc.1205877
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