Role of regulatory T-cells in immunization strategies involving a recombinant alphavirus vector system.

Abstract:

BACKGROUND:Regulatory T-cells (Treg) hamper immune responses elicited by cancer vaccines. Therefore, depletion of Treg is being used to improve the outcome of vaccinations. METHODS:We studied whether an alphavirus vector-based immunotherapeutic vaccine changes the number and/or activity of Treg and if Treg depletion improves the efficacy of this vaccine against tumours. The vaccine is based on a Semliki Forest virus (SFV). The recombinant SFV replicon particles encode a fusion protein of E6 and E7 from human papillomavirus (HPV) type 16 (SFVeE6,7). RESULTS:We demonstrated that SFVeE6,7 immunization did not change Treg levels and their suppressive activity. Depletion of Treg in mice, using the novel anti-folate receptor 4 antibody, did not enhance the immune response induced by SFVeE6,7 immunization. Both the priming and the proliferation phases of the HPV-specific response elicited with SFVeE6,7 were not affected by the immune-suppressive activity of Treg. Moreover, Treg depletion did not improve the therapeutic antitumour response of SFVeE6,7 in a murine tumour model. CONCLUSIONS:The efficacy of the SFVeE6,7 vaccine was not hampered by Treg. Therefore, SFVeE6,7 seems a very promising candidate for the treatment of HPV-induced disease, as it may not require additional immune interventions to modulate Treg activity.

journal_name

Antivir Ther

journal_title

Antiviral therapy

authors

Walczak M,Regts J,van Oosterhout AJ,Boon L,Wilschut J,Nijman HW,Daemen T

doi

10.3851/IMP1751

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

207-18

issue

2

eissn

1359-6535

issn

2040-2058

journal_volume

16

pub_type

杂志文章
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    authors: Vermeulen JN,Meijer DK,Over J,Lange J,Proost JH,Bakker HI,Beljaars L,Wit FW,Prins JM

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    doi:

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    doi:

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    doi:

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    authors: Drouot E,Piret J,Boivin G

    更新日期:2016-01-01 00:00:00