title: CD8 T cells inhibit respiratory syncytial virus (RSV) vaccine-enhanced disease.
abstract: Vaccination of children with a formalin-inactivated (FI) respiratory syncytial virus (RSV) vaccine led to exacerbated disease including pulmonary eosinophilia following a natural RSV infection. Immunization of BALB/c mice with FI-RSV or a recombinant vaccinia virus (vv) expressing the RSV attachment (G) protein (vvG) results in a pulmonary Th2 response and eosinophilia after RSV challenge that closely mimics the RSV vaccine-enhanced disease observed in humans. The underlying causes of RSV vaccine-enhanced disease remain poorly understood. We demonstrate here that RSV M2-specific CD8 T cells reduce the Th2-mediated pathology induced by vvG-immunization and RSV challenge in an IFN-gamma-independent manner. We also demonstrate that FI-RSV immunization does not induce a measurable RSV-specific CD8 T cell response and that priming FI-RSV-immunized mice for a potent memory RSV-specific CD8 T cell response abrogates pulmonary eosinophilia after subsequent RSV challenge. Our results suggest that the failure of the FI-RSV vaccine to induce a CD8 T cell response may have contributed to the development of pulmonary eosinophilia and augmented disease that occurred in vaccinated individuals.
authors.affiliation: Department of Microbiology, University of Iowa, IA 52242, USA.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Olson
authors.forename: Steven M
authors.initials: SM
authors.lastname: Varga
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000821:virology; D018984:Epitopes, T-Lymphocyte / Q000276:immunology; D005260:Female; D007156:Immunologic Memory; D007165:Immunosuppression Therapy; D007700:Kinetics; D008212:Lymphocyte Depletion; D051379:Mice; D008807:Mice, Inbred BALB C; D011657:Pulmonary Eosinophilia / Q000276:immunology / Q000517:prevention & control / Q000821:virology; D018357:Respiratory Syncytial Virus Infections / Q000276:immunology / Q000517:prevention & control* / Q000821:virology; D022261:Respiratory Syncytial Virus Vaccines / Q000276:immunology*; D012136:Respiratory Syncytial Viruses / Q000276:immunology*; D018418:Th2 Cells / Q000276:immunology / Q000473:pathology
chemical_list: D018984:Epitopes, T-Lymphocyte; D022261:Respiratory Syncytial Virus Vaccines