@article{yoon_zhu_ewing_smart_2007, title={Decreased survival of C/EBP beta-deficient keratinocytes is due to aberrant regulation of p53 levels and function}, volume={26}, ISSN={["1476-5594"]}, DOI={10.1038/sj.onc.1209797}, abstractNote={Recent studies have identified roles for C/EBPbeta in cellular survival and tumorigenesis, however, the mechanisms through which C/EBPbeta regulates these processes are not fully understood. Previously, we demonstrated that C/EBPbeta(-/-) mice are resistant to carcinogen-induced skin tumorigenesis and in response to topical carcinogen treatment display a 17-fold increase in keratinocyte apoptosis compared to wild-type mice. Here, we have investigated the mechanisms through which C/EBPbeta regulates apoptosis in response to carcinogenic stress. Analysis of carcinogen-treated C/EBPbeta(-/-) mouse skin revealed a striking increase in the number of p53 immunopositive keratinocytes in the epidermis of C/EBPbeta(-/-) mice compared to wild-type mice and this increase was temporally associated with a concomitant anomalous increase in apoptosis. The increased levels of p53 were functional as Mdm2, Bcl-2, C/EBPalpha and p21 were differentially regulated in the epidermis of carcinogen-treated C/EBPbeta(-/-) mice. The increase in p53 protein was not associated with an increase in p53 mRNA levels. To determine whether p53 is required for the increased apoptosis in C/EBPbeta(-/-) mice, C/EBPbeta/p53 compound knockout mice were generated. Carcinogen-treated C/EBPbeta/p53 compound knockout mice did not display increased apoptosis demonstrating p53 is required for the proapoptotic phenotype in C/EBPbeta(-/-) mice. Our results demonstrate that altered keratinocyte survival in C/EBPbeta(-/-) mice results from aberrant regulation of p53 protein and function and indicate C/EBPbeta has a role in the negative regulation of p53 protein levels in response to carcinogen-induced stress.}, number={3}, journal={ONCOGENE}, author={Yoon, K. and Zhu, S. and Ewing, S. J. and Smart, R. C.}, year={2007}, month={Jan}, pages={360–367} }
 @article{loomis_zhu_yoon_johnson_smart_2007, title={Genetic ablation of CCAAT/Enhancer binding protein alpha in epidermis reveals its role in suppression of epithelial tumorigenesis}, volume={67}, ISSN={["0008-5472"]}, DOI={10.1158/0008-5472.CAN-07-0139}, abstractNote={Abstract}, number={14}, journal={CANCER RESEARCH}, author={Loomis, Kari D. and Zhu, Songyun and Yoon, Kyungsil and Johnson, Peter F. and Smart, Robert C.}, year={2007}, month={Jul}, pages={6768–6776} }