CD4+ T-Cell-Mediated Antiviral Protection of the Upper Respiratory Tract in BALB/c Mice following Parenteral Immunization with a Recombinant Respiratory Syncytial Virus G Protein Fragment
AUTOR(ES)
Plotnicky-Gilquin, Hélène
FONTE
American Society for Microbiology
RESUMO
We analyzed the protective mechanisms induced against respiratory syncytial virus subgroup A (RSV-A) infection in the lower and upper respiratory tracts (LRT and URT) of BALB/c mice after intraperitoneal immunization with a recombinant fusion protein incorporating residues 130 to 230 of RSV-A G protein (BBG2Na). Mother-to-offspring antibody (Ab) transfer and adoptive transfer of BBG2Na-primed B cells into SCID mice demonstrated that Abs are important for LRT protection but have no effect on URT infection. In contrast, RSV-A clearance in the URT was achieved in a dose-dependent fashion after adoptive transfer of BBG2Na-primed T cells, while it was abolished in BBG2Na-immunized mice upon in vivo depletion of CD4+, but not CD8+, T cells. Furthermore, the conserved RSV-A G protein cysteines and residues 193 and 194, overlapping the recently identified T helper cell epitope on the G protein (P. W. Tebbey et al., J. Exp. Med. 188:1967–1972, 1998), were found to be essential for URT but not LRT protection. Taken together, these results demonstrate for the first time that CD4+ T cells induced upon parenteral immunization with an RSV G protein fragment play a critical role in URT protection of normal mice against RSV infection.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=111852Documentos Relacionados
- Gamma Interferon-Dependent Protection of the Mouse Upper Respiratory Tract following Parenteral Immunization with a Respiratory Syncytial Virus G Protein Fragment
- CD8+ T-Cell-Mediated Cross-Clade Protection in the Genital Tract following Intranasal Immunization with Inactivated Human Immunodeficiency Virus Antigen Plus CpG Oligodeoxynucleotides
- Fas-dependent CD4+ cytotoxic T-cell-mediated pathogenesis during virus infection
- Vaccination against persistent viral infection exacerbates CD4+ T-cell-mediated immunopathological disease.
- Pulmonary histopathology induced by respiratory syncytial virus (RSV) challenge of formalin-inactivated RSV-immunized BALB/c mice is abrogated by depletion of CD4+ T cells.