title: A new DNA vaccine fused with the C3d-p28 induces a Th2 immune response against amyloid-beta.
abstract: To enhance anti-amyloid-beta (Aβ) antibody generation and induce a Th2 immune response, we constructed a new DNA vaccine p(Aβ3-10)10-C3d-p28.3 encoding ten repeats of Aβ3-10 and three copies of C3d-p28 as a molecular adjuvant. In this study, we administered this adjuvant cularly to female C57BL/6J mice at 8-10 weeks of age. Enzyme linked immunosorbent assay was used to detect the titer of serum anti-Aβ antibody, isotypes, and cytokines in splenic T cells. A 3-(4,5-cimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay was used to detect the prolifera-tion rate of splenic T cells. Brain sections from a 12-month-old APP/PS1 transgenic mouse were used for detecting the binding capacities of anti-Aβ antibodies to Aβ plaques. The p(Aβ3-10)10-C3d-p28.3 vaccine induced high titers of anti-amyloid-β antibodies, which bound to Aβ plaques in APP/PS1 transgenic mouse brain tissue, demonstrating that the vaccine is effective against plaques in a mouse model of Alzheimer's disease. Moreover, the vaccine elicited a predo-minantly IgG1 humoral response and low levels of interferon-γ in ex vivo cultured splenocytes, dicating that the vaccine could shift the cellular immune response towards a Th2 phenotype. This indicated that the vaccine did not elicit a detrimental immune response and had a favorable safety profile. Our results indicate that the p(Aβ3-10)10-C3d-p28.3 vaccine is a promising immunothe-peutic option for Aβ vaccination in Alzheimer's disease.
authors.affiliation: Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang 110001, Liaoning Province, China.
authors.forename: Wanshu
authors.initials: W
authors.lastname: Guo
authors.affiliation: Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang 110001, Liaoning Province, China.
authors.forename: Sha
authors.initials: S
authors.lastname: Sha
authors.affiliation: Department of Neurology, First People's Hospital of Shenyang City, Shenyang 110041, Liaoning Province, China.
authors.forename: Tongzi
authors.initials: T
authors.lastname: Jiang
authors.affiliation: Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang 110001, Liaoning Province, China.
authors.forename: Xiaona
authors.initials: X
authors.lastname: Xing
authors.affiliation: Department of Neurology, First Affiliated Hospital of China Medical University, Shenyang 110001, Liaoning Province, China.
authors.forename: Yunpeng
authors.initials: Y
authors.lastname: Cao
keywords: Alzheimer's disease; C3d-p28 molecular adjuvant; C57BL/6J mice; DNA vaccine; Th2 immune response; active immunotherapy; amyloid-β; grants-supported paper; neural regeneration; neuroregeneration; passive immunotherapy