Relationship between humoral immune responses against HPV16, HPV18, HPV31 and HPV45 in 12-15 year old girls receiving Cervarix® or Gardasil® vaccine

Anna Godi, Sara L. Bissett, Elizabeth Miller, Simon Beddows

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Background: Human papillomavirus (HPV) vaccines confer protection against the oncogenic genotypes HPV16 and HPV18 through the generation of type-specific neutralizing antibodies raised against virus-like particles (VLP) representing these genotypes. The vaccines also confer a degree of cross-protection against HPV31 and HPV45, which are genetically-related to the vaccine types HPV16 and HPV18, respectively, although the mechanism is less certain. There are a number of humoral immune measures that have been examined in relation to the HPV vaccines, including VLP binding, pseudovirus neutralization and the enumeration of memory B cells. While the specificity of responses generated against the vaccine genotypes are fairly well studied, the relationship between these measures in relation to non-vaccine genotypes is less certain. Methods: We carried out a comparative study of these immune measures against vaccine and nonvaccine genotypes using samples collected from 12-15 year old girls following immunization with three doses of either Cervarix® or Gardasil® HPV vaccine. Results: The relationship between neutralizing and binding antibody titers and HPV-specific memory B cell levels for the vaccine genotypes, HPV16 and HPV18, were very good. The proportion of responders approached 100% for both vaccines while the magnitude of these responses induced by Cervarix® were generally higher than those following Gardasil® immunization. A similar pattern was found for the non-vaccine genotype HPV31, albeit at a lower magnitude compared to its genetically-related vaccine genotype, HPV16. However, both the enumeration of memory B cells and VLP binding responses against HPV45 were poorly related to its neutralizing antibody responses. Purified IgG derived from memory B cells demonstrated specificities similar to those found in the serum, including the capacity to neutralize HPV pseudoviruses. Conclusions: These data suggest that pseudovirus neutralization should be used as the preferred humoral immune measure for studying HPV vaccine responses, particularly for non-vaccine genotypes.

Original languageEnglish
Article numbere0140926
JournalPLoS ONE
Volume10
Issue number10
DOIs
Publication statusPublished - 23 Oct 2015

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