Abstract
Renal cell carcinoma (RCC) is resistant to chemotherapy, and this resistance is mirrored by a high apoptosis resistance of many RCC lines in vitro. Here, we report the loss of the pro-apoptotic BH3-only protein Bim in a large part of clinical RCC cases and provide evidence for a functional relevance of this loss. Immunohistochemistry of clear cell renal cell carcinoma cases and corresponding normal kidney showed strong Bim reactivity in renal tubules of all cases but loss of Bim in 35 of 45 RCC samples. Out of nine RCC cell lines investigated, six showed strongly diminished or undetectable levels of Bim protein by western blotting. Four RCC lines of varying apoptosis sensitivity were analysed further. Bcl-2, Bcl-xL, Mcl-1, Bax and Bak expression did not correlate with apoptosis sensitivity. All cell lines underwent apoptosis upon forced expression of Bax and Bim, suggesting an upstream difference. In all four lines, adriamycin induced p53 but not its targets Puma or Noxa. However, apoptosis sensitivity correlated with levels of Bim protein. Bim siRNA reduced apoptosis sensitivity in a susceptible cell line. Furthermore, inhibition of histone deacetylation restored Bim expression in cell lines. These data suggest that Bim has a function as a tumor suppressor in RCC.
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Abbreviations
- CCRCC:
-
clear cell renal cell carcinoma
- HDAC:
-
histone deacetylase
- RCC:
-
renal cell carcinoma
- TSA:
-
trichostatin A
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Acknowledgements
We thank Christina Hilpert, Antje and Anja Richter for expert technical assistance. This work was supported by the Deutsche Krebshilfe (grant 10-1923 to NZ and GH).
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Zantl, N., Weirich, G., Zall, H. et al. Frequent loss of expression of the pro-apoptotic protein Bim in renal cell carcinoma: evidence for contribution to apoptosis resistance. Oncogene 26, 7038–7048 (2007). https://doi.org/10.1038/sj.onc.1210510
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DOI: https://doi.org/10.1038/sj.onc.1210510
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