Human papillomavirus type 16 E6 activates NF-kappaB, induces cIAP-2 expression, and protects against apoptosis in a PDZ binding motif-dependent manner. J Virol 2006 Jun;80(11):5301-7
Date
05/16/2006Pubmed ID
16699010Pubmed Central ID
PMC1472131DOI
10.1128/JVI.01942-05Scopus ID
2-s2.0-33646727381 (requires institutional sign-in at Scopus site) 136 CitationsAbstract
Infection with human papillomavirus (HPV) is a critical factor in the pathogenesis of most cervical cancers and some aerodigestive cancers. The HPV E6 oncoprotein from high-risk HPV types contributes to the immortalization and transformation of cells by multiple mechanisms, including degradation of p53, transcriptional activation of human telomerase reverse transcriptase (hTERT), and degradation of several proteins containing PDZ domains. The ability of E6 to bind PDZ domain-containing proteins is independent of p53 degradation or hTERT activation but does correlate with oncogenic potential (R. A. Watson, M. Thomas, L. Banks, and S. Roberts, J. Cell Sci. 116:4925-4934, 2003) and is essential for induction of epithelial hyperplasia in vivo (M. L. Nguyen, M. M. Nguyen, D. Lee, A. E. Griep, and P. F. Lambert, J. Virol. 77:6957-6964, 2003). In this study, we found that HPV type 16 E6 was able to activate NF-kappaB in airway epithelial cells through the induction of nuclear binding activity of p52-containing NF-kappaB complexes in a PDZ binding motif-dependent manner. Transcript accumulation for the NF-kappaB-responsive antiapoptotic gene encoding cIAP-2 and binding of nuclear factors to the proximal NF-kappaB binding site of the cIAP-2 gene promoter are induced by E6 expression. Furthermore, E6 is able to protect cells from TNF-induced apoptosis. All of these E6-dependent phenotypes are dependent on the presence of the PDZ binding motif of E6. Our results imply a role for targeting of PDZ proteins by E6 in NF-kappaB activation and protection from apoptosis in airway epithelial cells.
Author List
James MA, Lee JH, Klingelhutz AJMESH terms used to index this publication - Major topics in bold
Adaptor Proteins, Signal TransducingAmino Acid Motifs
Apoptosis
Baculoviral IAP Repeat-Containing 3 Protein
Binding Sites
Epithelial Cells
Human papillomavirus 16
Humans
Inhibitor of Apoptosis Proteins
NF-kappa B
Ubiquitin-Protein Ligases
