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Structural proteins of Kaposi’s sarcoma-associated herpesvirus antagonize p53-mediated apoptosis

Oncogene volume 34, pages 639–649 (2015)Cite this article

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Abstract

The tumor suppressor p53 is a central regulatory molecule of apoptosis and is commonly mutated in tumors. Kaposi’s sarcoma-associated herpesvirus (KSHV)-related malignancies express wild-type p53. Accordingly, KSHV encodes proteins that counteract the cell death-inducing effects of p53. Here, the effects of all KSHV genes on the p53 signaling pathway were systematically analyzed using the reversely transfected cell microarray technology. With this approach we detected eight KSHV-encoded genes with potent p53 inhibiting activity in addition to the previously described inhibitory effects of KSHV genes ORF50, K10 and K10.5. Interestingly, the three most potent newly identified inhibitors were KSHV structural proteins, namely ORF22 (glycoprotein H), ORF25 (major capsid protein) and ORF64 (tegument protein). Validation of these results with a classical transfection approach showed that these proteins inhibited p53 signaling in a dose-dependent manner and that this effect could be reversed by small interfering RNA-mediated knockdown of the respective viral gene. All three genes inhibited p53-mediated apoptosis in response to Nutlin-3 treatment in non-infected and KSHV-infected cells. Addressing putative mechanisms, we could show that these proteins could also inhibit the transactivation of the promoters of apoptotic mediators of p53 such as BAX and PIG3. Altogether, we demonstrate for the first time that structural proteins of KSHV can counteract p53-induced apoptosis. These proteins are expressed in the late lytic phase of the viral life cycle and are incorporated into the KSHV virion. Accordingly, these genes may inhibit cell death in the productive and in the early entrance phase of KSHV infection.

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Acknowledgements

We thank Professor Moshe Oren, Professor Wafik S El-Deiry and Professor Bert Vogelstein for sharing plasmids. In addition, we thank PD Dr Reiner Strick and PD Dr Pamela Strissel (University Medical Center Erlangen, Department of Obstetrics and Gynecology) for providing the MCF7 cells. This work was supported by grants of the German Federal Ministry of Education and Research (BMBF, Polyprobe-Study), the Deutsche Forschungsgemeinschaft (DFG-GRK1071, STU238/6-1, SFB796 (sub-project B9)) and the German Cancer Aid (109510). Additional support was obtained from the Interdisciplinary Center for Clinical Research (IZKF) and the Emerging Fields Initiative of the Friedrich-Alexander University of Erlangen to MS, by a grant for the promotion of young researchers (ELAN) of the University Medical Center Erlangen to AK and a grant of the ‘Programm zur Förderung der Chancengleichheit für Frauen in Forschung und Lehre (FFL)’ to PC.

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  1. Division of Molecular and Experimental Surgery, Department of Surgery, University Medical Center Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany

    P Chudasama, A Konrad, R Jochmann, P Holz, E Naschberger, N Britzen-Laurent & M Stürzl

  2. Department of Mathematical Sciences, University of Essex, Colchester, UK

    B Lausen

  3. Institute of Clinical and Molecular Virology, University Medical Center Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany

    F Neipel

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  1. P Chudasama
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Chudasama, P., Konrad, A., Jochmann, R. et al. Structural proteins of Kaposi’s sarcoma-associated herpesvirus antagonize p53-mediated apoptosis. Oncogene 34, 639–649 (2015). https://doi.org/10.1038/onc.2013.595

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