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In the present study, the adjuvant activity of flagellin was compared, in the conjugated and mixed forms, against a peptide vaccine from human immunodeficiency virus type 1 (HIV-1) p24-Nef vaccine candidate. Mice were immunized with the HIV-1 p24-Nef peptide with flagellin in both conjugated and mixed forms. Lymphocyte proliferation, CTL activity, and IL-4 and IFN-γ cytokines were evaluated by bromodeoxyuridine, carboxyfluorescein succinimidyl ester and ELISA methods, respectively. At the same time, the frequency of IFN-γ-producing T-lymphocytes, as well as total and isotype-specific antibodies, were assessed by ELISPOT and indirect ELISA, respectively. Our experimental results showed that the immunized mice with the HIV-1 p24-Nef conjugated or mixed forms of flagellin led to increases in the proliferative responses and Th1 cytokine pattern. The conjugated form of vaccine led to increased CTL activity and a Th1 cytokine pattern of immune responses, as well as an IgM isotype of humoral responses in comparison with the mixed form. The flagellin-conjugated vaccine seems to be more potent in increasing vaccine immunogenicity.

journal of medical microbiology/journal of medical microbiology

Pseudomonas aeruginosa flagellin as an adjuvant: superiority of a conjugated form of flagellin versus a mixture with a human immunodeficiency virus type 1 vaccine candidate in the induction of immune responses