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Loss of Nuclear Factor-B Is Tumor Promoting but Does Not Substitute for Loss of p53

¹ Tumor Cell Death Laboratory and ² Tumor Suppression Laboratory, Beatson Institute for Cancer Research, Cancer Research UK Beatson Laboratories, Glasgow, United Kingdom, and ³ Regulation of Cell Growth Laboratory, National Cancer Institute at Frederick, Frederick, Maryland

Inactivation of apoptotic pathways is a common event in cancer. Two transcription factors that regulate apoptosis during tumorigenesis are p53 and nuclear factor (NF)-B. Although NF-B is generally considered a suppressor of cell death, we showed previously that NF-B can contribute to p53-induced death. Here, we show that loss of p65, a critical subunit of NF-B, can cause resistance to different agents that signal death through p53. Loss of p65 also enhances tumorigenesis induced by E1a and Ras. Unlike loss of p53, however, loss of p65 does not cause anchorage-independent growth or enable tumor development following expression of a single oncogene. These findings reaffirm the role of NF-B in p53-induced death but show that its loss does not substitute for loss of p53 in tumor development. Moreover, this indicates that, although perhaps central to p53 function, loss of the ability to induce programmed cell death does not completely inactivate p53’s tumor-suppressive effects.

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