Developments in L2-based human papillomavirus (HPV) vaccines

Christina Schellenbacher, Richard S Roden, Reinhard Kirnbauer

Research output: Contribution to journalArticle

Abstract

Infections with sexually transmitted high-risk Human Papillomavirus (hrHPV), of which there are at least 15 genotypes, are responsible for a tremendous disease burden by causing cervical, and subsets of other ano-genital and oro-pharyngeal carcinomas, together representing 5% of all cancer cases worldwide. HPV subunit vaccines consisting of virus-like particles (VLP) self-assembled from major capsid protein L1 plus adjuvant have been licensed. Prophylactic vaccinations with the 2-valent (HPV16/18), 4-valent (HPV6/11/16/18), or 9-valent (HPV6/11/16/18/31/33/45/52/58) vaccine induce high-titer neutralizing antibodies restricted to the vaccine types that cause up to 90% of cervical carcinomas, a subset of other ano-genital and oro-pharyngeal cancers and 90% of benign ano-genital warts (condylomata). The complexity of manufacturing multivalent L1-VLP vaccines limits the number of included VLP types and thus the vaccines' spectrum of protection, leaving a panel of oncogenic mucosal HPV unaddressed. In addition, current vaccines do not protect against cutaneous HPV types causing benign skin warts, or against beta-papillomavirus (betaPV) types implicated in the development of non-melanoma skin cancer (NMSC) in immunosuppressed patients. In contrast with L1-VLP, the minor capsid protein L2 contains type-common epitopes that induce low-titer yet broadly cross-neutralizing antibodies to heterologous PV types and provide cross-protection in animal challenge models. Efforts to increase the low immunogenicity of L2 (poly)-peptides and thereby to develop broader-spectrum HPV vaccines are the focus of this review.

Original languageEnglish (US)
JournalVirus Research
DOIs
StateAccepted/In press - Sep 12 2016

Keywords

  • Cervical cancer (CxCa)
  • Cutaneous and anogenital warts (condylomata)
  • HPV infection and disease
  • Human papillomavirus (HPV) vaccine
  • Minor capsid protein (L2)
  • Squamous cell cancer (SCC)

ASJC Scopus subject areas

  • Cancer Research
  • Infectious Diseases
  • Virology

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