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HPV-E7 delivered by engineered exosomes elicits a protective CD8⁺ T cell-mediated immune response.

Abstract：

:We developed an innovative strategy to induce a cytotoxic T cell (CTL) immune response against protein antigens of choice. It relies on the production of exosomes, i.e., nanovesicles spontaneously released by all cell types. We engineered the upload of huge amounts of protein antigens upon fusion with an anchoring protein (i.e., HIV-1 Nefmut), which is an inactive protein incorporating in exosomes at high levels also when fused with foreign proteins. We compared the immunogenicity of engineered exosomes uploading human papillomavirus (HPV)-E7 with that of lentiviral virus-like particles (VLPs) incorporating equivalent amounts of the same antigen. These exosomes, whose limiting membrane was decorated with VSV-G, i.e., an envelope protein inducing pH-dependent endosomal fusion, proved to be as immunogenic as the cognate VLPs. It is noteworthy that the immunogenicity of the engineered exosomes remained unaltered in the absence of VSV-G. Most important, we provide evidence that the inoculation in mouse of exosomes uploading HPV-E7 induces production of anti-HPV E7 CTLs, blocks the growth of syngeneic tumor cells inoculated after immunization, and controls the development of tumor cells inoculated before the exosome challenge. These results represent the proof-of-concept about both feasibility and efficacy of the Nefmut-based exosome platform for the induction of CD8+ T cell immunity.

journal_name

Viruses

journal_title

Viruses

authors

Di Bonito P,Ridolfi B,Columba-Cabezas S,Giovannelli A,Chiozzini C,Manfredi F,Anticoli S,Arenaccio C,Federico M

doi

10.3390/v7031079

subject

Has Abstract

pub_date

2015-03-09 00:00:00

pages

1079-99

issue

3

issn

1999-4915

pii

v7031079

journal_volume

7

pub_type

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