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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Recombinant interleukin 2 as an adjuvant for vaccine-induced protection. Immunization of guinea pigs with herpes simplex virus subunit vaccines.

We determined that recombinant interleukin 2 (rIL-2) administered in conjunction with herpes simplex virus (HSV) crude extract or recombinant glycoprotein D subunit vaccine enhances the protective effect of either antigen preparation against HSV type 2 genital infection in guinea pigs. Animals that received the vaccine accompanied by rIL-2 had an incidence of infection, assessed by detection of clinical lesions and/or viral shedding, that varied between 0 and 43% significantly lower than the incidence of 63 to 100% in guinea pigs submitted to the same immunization schedule without rIL-2. Animals that escaped acute infection failed to develop recurrent disease. In addition, severity of acute infection was decreased by rIL-2 co-administration as well as by increasing the number of vaccine doses. We also studied the immune response of the guinea pigs to vaccination and the mechanism of protection. Both enzyme-linked immunosorbent assay titers of antibodies to HSV type 2 and specific antigen stimulation of lymphocytes measured by proliferation and interferon production did not significantly differ among the immunization groups. However, specific cellular cytotoxicity was enhanced by rIL-2 co-administration and was positively correlated with protection. This suggests that rIL-2 may become an important adjuvant in active immunization programs using subunit vaccines, particularly against diseases in which cellular cytotoxicity is a major defense mechanism.[1]


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