p73ß, unlike p53, suppresses growth and induces apoptosis of human papillomavirus E6-expressing cancer cells

Nitas Prabhu, Kumaravel Somasundaram, Kapaettu Satyamoorthy, Meenhard Herlyn, Wafik S. El-Deiry

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    82 Citations (Scopus)


    Human papillomavirus (HPV) is the major cause of cervical cancer worldwide. HPV-E6 protein targets the p53 tumor suppressor protein for degradation by ubiquitin-mediated proteolysis making such cancers resistant to p53-gene therapy. Here we show that infection of human cancer cells by E6-expressing adenovirus (Ad-E6) leads to degradation of both wild-type or mutant p53 protein. Interestingly, the p53-homologue candidate tumor suppressor p73 is not degraded in Ad-E6 infected cancer cells. Wild-type p73ß and not wild-type p53 or mutant p73 is a potent inhibitor of cancer colony growth and inducer of apoptosis, despite HPV-E6 overexpression. The results suggest a novel strategy using p73ß in gene therapy of HPV-E6 expressing cancers.

    Original languageEnglish
    Pages (from-to)5-9
    Number of pages5
    JournalInternational Journal of Oncology
    Issue number1
    Publication statusPublished - 07-1998


    All Science Journal Classification (ASJC) codes

    • Oncology
    • Cancer Research

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