Abstract
In this study, the mucosal adjuvant activity of Salmonella flagellin as a carrier in a conjugate of EXP153-rFliC was investigated. EXP153-rFliC was made by conjugation of a synthetic B-cell epitope peptide derived from Plasmodium falciparum exported protein-1(EXP153) to recombinant phase 1 flagellin of Salmonella enterica serovar Typhimurium expressed in Escherichia coli (rFliC), and used to immunize BALB/c mice via intranasal instillation. It was found that robust EXP153-specific serum IgG antibodies were induced without additional adjuvant. EXP153-specific sIgA antibodies were also induced, these being detected in bronchoalveolar, nasal, vaginal and intestinal washes. These observations demonstrate that Salmonella flagellin as a carrier is an effective mucosal adjuvant in that its conjugated peptide induces antibody responses.
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