Longitudinal requirement for CD4+ T cell help for adenovirus vector-elicited CD8+ T cell responses.
J Immunol
; 192(11): 5214-25, 2014 Jun 01.
Article
en En
| MEDLINE
| ID: mdl-24778441
ABSTRACT
Despite the widespread use of replication-incompetent recombinant adenovirus (Ad) vectors as candidate vaccine platforms, the mechanism by which these vectors elicit CD8(+) T cell responses remains poorly understood. Our data demonstrate that induction and maintenance of CD8(+) T cell responses by Ad vector immunization is longitudinally dependent on CD4(+) T cell help for a prolonged period. Depletion of CD4(+) T cells in wild type mice within the first 8 d following Ad immunization resulted in dramatically reduced induction of Ag-specific CD8(+) T cells, decreased T-bet and eomesodermin expression, impaired KLRG1(+) effector differentiation, and atypical expression of the memory markers CD127, CD27, and CD62L. Moreover, these CD8(+) T cells failed to protect against a lethal recombinant Listeria monocytogenes challenge. Depletion of CD4(+) T cells between weeks 1 and 4 following immunization resulted in increased contraction of memory CD8(+) T cells. These data demonstrate a prolonged temporal requirement for CD4(+) T cell help for vaccine-elicited CD8(+) T cell responses in mice. These findings have important implications in the design of vaccines aimed at eliciting CD8(+) T cell responses and may provide insight into the impaired immunogenicity of vaccines in the context of AIDS and other CD4(+) T cell immune deficiencies.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Vacunas Bacterianas
/
Linfocitos T CD4-Positivos
/
Adenoviridae
/
Linfocitos T CD8-positivos
/
Vectores Genéticos
/
Listeriosis
/
Listeria monocytogenes
Límite:
Animals
Idioma:
En
Revista:
J Immunol
Año:
2014
Tipo del documento:
Article