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Immortalized fibroblasts from NF-κB RelA knockout mice show phenotypic heterogeneity and maintain increased sensitivity to tumor necrosis factor α after transformation by v-Ras

Abstract

Activation of the NF-κB pathway can either promote or block apoptosis and oncogenesis in different cell types and circumstances. In this report, we show that independently derived immortalized mouse embryonic fibroblast cell lines prepared from RelA knockout mice have different phenotypes, based on their sensitivity to tumor necrosis factor α (TNFα)-induced apoptosis, morphology, ability to form colonies in soft agar, and the presence of distinct κB site-binding complexes. In addition, these RelA-deficient cell lines appear to have distinct alterations in the p53 pathway, which correlate with the normal vs transformed status of individual cell lines. We have also infected mouse embryonic fibroblasts lacking RelA, c-Rel or p50 with a retrovirus for the expression of v-Ha-Ras to determine whether individual NF-κB family members are required for Ras-mediated transformation. All three NF-κB-deficient cell types could be transformed by v-Ha-Ras. However, v-Ras-infected RelA-deficient cells formed colonies in soft agar at an approximately fourfold reduced efficiency compared to v-Ras-transformed control mouse 3T3 and p50-deficient cells. Ras transformation did not alter the sensitivity of RelA-deficient cells to TNFα-induced apoptosis, and Ras transformation did not affect the general resistance of 3T3, c-Rel-deficient, and p50-deficient cells to TNFα-induced apoptosis. However, TNFα specifically and dose-dependently decreased the ability of v-Ras-transformed RelA-deficient cells to form colonies in soft agar. These results suggest that RelA is a potential protein target for human tumors driven by oncogenic Ras mutations, but caution that inhibition of RelA may promote tumorigenesis in some circumstances.

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Acknowledgements

We thank Demetrios Kalaitzidis and Naomi Rosenberg for helpful discussions. We thank Mark Hannink for c-rel−/− fibroblasts, and Amer Beg for nfkb1−/− fibroblasts, Youssef Jounaidi for Bosc23 retrovirus-packaging cells, Nancy Rice for antibody to mouse RelA (to TDG), and Steve Tronick for NF-κB antibodies (to AH). This work was supported by NIH grant CA47763 (to TDG). AH thanks David Baltimore for generous support during the course of this work. ADP was partially supported by funds from the Boston University Undergraduate Research Opportunities Program.

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Correspondence to Thomas D Gilmore.

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Gapuzan, ME., Schmah, O., Pollock, A. et al. Immortalized fibroblasts from NF-κB RelA knockout mice show phenotypic heterogeneity and maintain increased sensitivity to tumor necrosis factor α after transformation by v-Ras. Oncogene 24, 6574–6583 (2005). https://doi.org/10.1038/sj.onc.1208809

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