CD4+ CD25+ T cells regulate vaccine-generated primary and memory CD8+ T-cell responses against herpes simplex virus type 1.

Abstract:

:It has become evident that naturally occurring CD25(+) regulatory T cells (T(reg) cells) not only influence self-antigen specific immune response but also dampen foreign antigen specific immunity. This report extends our previous findings by demonstrating that immunity to certain herpes simplex virus (HSV) vaccines is significantly elevated and more effective if T(reg) cell response is curtailed during either primary or recall immunization. The data presented here show that removal of CD25(+) T(reg) cells prior to SSIEFARL-CpG or gB-DNA immunization significantly enhanced the resultant CD8(+) T-cell response to the immunodominant SSIEFARL peptide. The enhanced CD8(+) T-cell reactivity in T(reg) cell-depleted animals was between two- and threefold and evident in both acute and memory stages. Interestingly, removal of CD25(+) T(reg) cells during the memory recall response to plasmid immunization resulted in a twofold increase in CD8(+) T-cell memory pool. Moreover, in the challenge experiments, memory CD8(+) T cells generated with plasmid DNA in the absence of T(reg) cells cleared the virus more effectively compared with control groups. We conclude that CD25(+) T(reg) cells quantitatively as well as qualitatively affect the memory CD8(+) T-cell response generated by gB-DNA vaccination against HSV. However, it remains to be seen if all types of vaccines against HSV are similarly affected by CD25(+) T(reg) cells and if it is possible to devise means of limiting T(reg) cell activity to enhance vaccine efficacy.

journal_name

J Virol

journal_title

Journal of virology

authors

Toka FN,Suvas S,Rouse BT

doi

10.1128/JVI.78.23.13082-13089.2004

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

13082-9

issue

23

eissn

0022-538X

issn

1098-5514

pii

78/23/13082

journal_volume

78

pub_type

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