Abstract:
:Vaccine formulation can influence cytokine and disease patterns in mice following respiratory syncytial virus (RSV) challenge. The influence of different live and killed dual-vaccine combinations on subsequent immune responses was investigated. BALB/c mice received either killed followed by killed (KV/KV), killed followed by live (KV/LV), live followed by killed (LV/KV), or live followed by live (LV/LV) RSV vaccines intramuscularly. Mouse weight loss, viral replication, cytokine expression patterns, immunoglobulin isotype antibody profiles, neutralizing antibody responses, and cytotoxicity T lymphocyte (CTL) activities in lungs were compared on subsequent live RSV challenge. On challenge, mice vaccinated initially with KV and boosted with either KV or LV expressed significantly skewed ratios of IL-4 to IFN-gamma mRNA and IgG1 to IgG2a antibody, when compared to those vaccinated initially with LV. Low levels of RSV replication were detected in lungs of mice vaccinated with KV/KV, KV/LV, and LV/KV, but not in mice vaccinated with LV/LV. Mice vaccinated with KV/LV, LV/KV, or LV/LV had RSV-specific CTL activity in lungs six days after RSV challenge, while no CTL activity was detected in KV/KV-vaccinated mice. Mice vaccinated with KV/KV had the greatest weight loss, while LV/LV-vaccinated mice resulted in the least. Mice vaccinated with either KV/LV or LV/KV had intermediate weight loss after challenge. These data indicate that an original antigenic sin-like phenomenon was exhibited in cytokine and immunoglobulin isotype responses in mice after challenge. T helper (Th)-like immune responses were determined solely by the initial vaccination, while weight loss, viral replication, neutralizing antibody responses, and CTL activities were also influenced by boosted vaccinations.
journal_name
Virus Resjournal_title
Virus researchauthors
Tang YWdoi
10.1016/j.virusres.2003.10.009subject
Has Abstractpub_date
2004-01-01 00:00:00pages
81-7issue
1eissn
0168-1702issn
1872-7492pii
S0168170203003204journal_volume
99pub_type
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