Clinical And Immunologic Responses To Human Immunodeficiency Virus (HIV) Type LSF2 gp120 Subunit Vaccine Combined With MF59 Adjuvant With Or Without Muramyl Tripeptide Dipalmitoyl Phosphatidylethanolamine In Non-HIV-Infected Human Volunteers

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Abstract
A phase 1 study of 42 non-human immunodeficiency virus type 1 (HIV)- infected volunteers was initiated to determine the safety and immunogenicity of an HIV subunit vaccine consisting of recombinant envelope gp 120 derived from HIVSF2 (rgp 120SF2) combined with a novel adjuvant, MF59, with or without the immunomodulator muramyl tripeptide dipalmitoyl phosphatidylethanolamine (MTP-PE). All injections contained adjuvant MF59, and subjects were grouped according to MTP-PE dose. Injections were given on days 0, 30, 180, and 365. The vaccine was well tolerated with limited local and systemic reactions. These immunizations induced rgp120SF2 -specific binding antibodies that persisted ⩽5?24 weeks. After three immunizations, all subjects receiving the antigen developed neutralizing antibodies to HIVSF2 , and serum from 67% of these subjects also cross-neutralized HIVMN . ELISA-reactive antibodies to the HIVSF2 V3 region and strong lymphoproliferative responses to HIVSF2 envelope proteins were detected in all rgp 120SF2 -immunized subjects.

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