Human Papillomavirus Regulates HER3 Expression in Head and Neck Cancer: Implications for Targeted HER3 Therapy in HPV + Patients

Human papillomavirus (HPV) 16 plays an etiologic role in a growing subset of head and neck squamous cell carcinomas (HNSCC), where viral expression of the E6 and E7 oncoproteins is necessary for tumor growth and maintenance. Although patients with HPV tumors have a more favorable prognosis, there ar...

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Published in:	Clinical cancer research 2017-06, Vol.23 (12), p.3072-3083
Main Authors:	Brand, Toni M, Hartmann, Stefan, Bhola, Neil E, Peyser, Noah D, Li, Hua, Zeng, Yan, Isaacson Wechsler, Erin, Ranall, Max V, Bandyopadhyay, Sourav, Duvvuri, Umamaheswar, LaVallee, Theresa M, Jordan, Richard C K, Johnson, Daniel E, Grandis, Jennifer R
Format:	Article
Language:	eng
Subjects:	1-Phosphatidylinositol 3-kinase Animals Biotechnology Cancer Carcinoma, Squamous Cell - drug therapy Carcinoma, Squamous Cell - genetics Carcinoma, Squamous Cell - pathology Carcinoma, Squamous Cell - virology Cell Line, Tumor Elafin - genetics Etiology Experimental design Gene Expression Regulation, Neoplastic - genetics Gene Expression Regulation, Viral - genetics Head Head and neck cancer Head and neck carcinoma Head and Neck Neoplasms - drug therapy Head and Neck Neoplasms - genetics Head and Neck Neoplasms - pathology Head and Neck Neoplasms - virology Human papillomavirus Human papillomavirus 16 - pathogenicity Humans Investigations Kinases Medical prognosis Mice Molecular Targeted Therapy Monoclonal antibodies Oncogene Proteins, Viral - genetics Papillomavirus E7 Proteins - genetics Papillomavirus Infections - genetics Papillomavirus Infections - virology Patients Pharynx Protein-tyrosine kinase receptors Receptor, ErbB-3 - antagonists & inhibitors Receptor, ErbB-3 - genetics Repressor Proteins - genetics RNA, Small Interfering - administration & dosage RNA, Small Interfering - genetics Signaling siRNA Squamous cell carcinoma Squamous Cell Carcinoma of Head and Neck Therapy Tumors Tyrosine Xenograft Model Antitumor Assays Xenografts
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Summary:	Human papillomavirus (HPV) 16 plays an etiologic role in a growing subset of head and neck squamous cell carcinomas (HNSCC), where viral expression of the E6 and E7 oncoproteins is necessary for tumor growth and maintenance. Although patients with HPV tumors have a more favorable prognosis, there are currently no HPV-selective therapies. Recent studies identified differential receptor tyrosine kinase (RTK) profiles in HPV versus HPV tumors. One such RTK, HER3, is overexpressed and interacts with phosphoinositide-3-kinase (PI3K) in HPV tumors. Therefore, we investigated the role of HPV oncoproteins in regulating HER3-mediated signaling and determined whether HER3 could be a molecular target in HPV HNSCC. HER3 was investigated as a molecular target in HPV HNSCC using established cell lines, patient-derived xenografts (PDX), and human tumor specimens. A mechanistic link between HPV and HER3 was examined by augmenting E6 and E7 expression levels in HNSCC cell lines. The dependency of HPV and HPV HNSCC models on HER3 was evaluated with anti-HER3 siRNAs and the clinical stage anti-HER3 monoclonal antibody KTN3379. HER3 was overexpressed in HPV HNSCC, where it was associated with worse overall survival in patients with pharyngeal cancer. Further investigation indicated that E6 and E7 regulated HER3 protein expression and downstream PI3K pathway signaling. Targeting HER3 with siRNAs or KTN3379 significantly inhibited the growth of HPV cell lines and PDXs. This study uncovers a direct relationship between HPV infection and HER3 in HNSCC and provides a rationale for the clinical evaluation of targeted HER3 therapy for the treatment of HPV patients. .
ISSN:	1078-0432 1557-3265