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DNA epitope vaccine containing complement component C3d enhances anti-amyloid-beta antibody production and polarizes the immune response towards a Th2 phenotype. |
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AbstractWe have engineered a DNA epitope vaccine that expresses 3 self-B cell epitopes of Abeta(42) (3Abeta(1-11)), a non-self T helper (Th) cell epitope (PADRE), and 3 copies of C3d (3C3d), a component of complement as a molecular adjuvant, designed to safely reduce CNS Abeta. Immunization of mice with 3Abeta(1-11)-PADRE epitope vaccine alone generated only moderate levels of anti-Abeta antibodies and a pro-inflammatory T helper (Th1 phenotype) cellular immune response. However, the addition of 3C3d to the vaccine construct significantly augmented the anti-Abeta humoral immune response and, importantly, shifted the cellular immune response towards the potentially safer anti-inflammatory Th2 phenotype.
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