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Safe and potent new adjuvants are needed for vaccines that are administered to mucosal surfaces. This study was performed to determine if interleukin-1alpha (IL-1alpha) combined with other proinflammatory cytokines provided mucosal adjuvant activity for induction of systemic and mucosal anti-human immunodeficiency virus (HIV) peptide antibody when intranasally administered with an HIV peptide immunogen. Nasal immunization of BALB/c mice with 10 microg of an HIV env peptide immunogen with IL-1alpha, IL-12, and IL-18 on days 0, 7, 14, and 28 induced peak serum anti-HIV peptide immunoglobulin G1 (IgG1) and IgA titers of 1:131,072 and 1:7,131, respectively (P = 0.05 versus no adjuvant). The use of cholera toxin (CT) as a mucosal adjuvant induced serum IgG1 and IgA titers of 1:32,768 and 1:776, respectively. The adjuvant combination of IL-1alpha, IL-12, and IL-18 induced anti-HIV peptide IgA titers of 1:1,176, 1:7,131, and 1:4,705 in saliva, fecal extracts and vaginal lavage, respectively. Titers induced by the use of CT as an adjuvant were 1:223, 1:1,176, and 1:675, respectively. These results indicate that the proinflammatory cytokines IL-1alpha, IL-12, and IL-18 can replace CT as a mucosal adjuvant for antibody induction and are important candidates for use as mucosal adjuvants with HIV and other vaccines.

journal of virology

Cytokines as Adjuvants for the Induction of Anti-Human Immunodeficiency Virus Peptide Immunoglobulin G (IgG) and IgA Antibodies in Serum and Mucosal Secretions after Nasal Immunization