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TA-p73 Acts as an Oncogene1
Centre for Cancer Research and Cancer Therapy, Institute of Molecular Biology [T. S., S. Z., H. E., B. M. P.] and Department of General and Transplantation Surgery [A. F.], University of Essen, Medical School, D-45122 Essen, Germany
The recently discovered p53-family member p73 displays significant homology to p53, but data from primary tumors and knockout mice argue against p73 being a classical tumor suppressor. We report on the overexpression of NH2-terminally truncated, transactivation-deficient p73 proteins (
TA-p73) in human cancer cells. Moreover, we show that
TA-p73 overexpression results in malignant transformation of NIH3T3 fibroblasts and tumor growth in nude mice, thereby providing the experimental evidence for an oncogenic function of
TA-p73. Apparently, increased expression of NH2-terminally truncated p73 isoforms conveys the TP73 gene with oncogenic activity that appears to be actively selected for during tumor development.
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