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- W1601707568 abstract "Virus-specific CD4(+) T cell responses have been shown to play a critical role in controlling HIV-1 replication. Candidate HIV-1 vaccines should therefore elicit potent CD4(+) as well as CD8(+) T cell responses. In this report we investigate the ability of plasmid GM-CSF to augment CD4(+) T cell responses elicited by an HIV-1 gp120 DNA vaccine in mice. Coadministration of a plasmid expressing GM-CSF with the gp120 DNA vaccine led to only a marginal increase in gp120-specific splenocyte CD4(+) T cell responses. However, immunization with a bicistronic plasmid that coexpressed gp120 and GM-CSF under control of a single promoter led to a dramatic augmentation of vaccine-elicited CD4(+) T cell responses, as measured by both cellular proliferation and ELISPOT assays. This augmentation of CD4(+) T cell responses was selective, since vaccine-elicited Ab and CD8(+) T cell responses were not significantly changed by the addition of GM-CSF. A 100-fold lower dose of the gp120/GM-CSF bicistronic DNA vaccine was required to elicit detectable gp120-specific splenocyte proliferative responses compared with the monocistronic gp120 DNA vaccine. Consistent with these findings, i.m. injection of the gp120/GM-CSF bicistronic DNA vaccine evoked a more extensive cellular infiltrate at the site of inoculation than the monocistronic gp120 DNA vaccine. These results demonstrate that bicistronic DNA vaccines containing GM-CSF elicit remarkably potent CD4(+) T cell responses and suggest that optimal Th cell priming requires the precise temporal and spatial codelivery of Ag and GM-CSF." @default.
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- W1601707568 date "2002-01-15" @default.
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- W1601707568 title "Potent CD4+ T Cell Responses Elicited by a Bicistronic HIV-1 DNA Vaccine Expressing gp120 and GM-CSF" @default.
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- W1601707568 doi "https://doi.org/10.4049/jimmunol.168.2.562" @default.
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