Abstract:
:To demonstrate the potential of pH-sensitive carbonate apatite (CO₃Ap) nanoparticles as DNA vaccine carriers to enhance vaccination efficacy, we examined the humoral and cellular immune responses of C57BL/6 mice immunized with the plasmid expression vector pCI-neo encoding the full-length soluble ovalbumin (OVA) (pCI-neo-sOVA), pCI-neo-sOVA/CO₃Ap complexes, or pCI-neo/CO₃Ap complexes as a control. Mice immunized with a low dose of pCI-neo-sOVA-loaded CO₃Ap (10 μg) produced ex vivo splenocyte proliferation after stimulation with CD8 T-cell but not CD4 T-cell epitopes and a delayed-type-hypersensitivity reaction more efficiently than mice in the other groups. Furthermore, mice receiving this immunization generated the same levels of OVA-specific antibodies and interferon (IFN)-γ secretion after CD8 T-cell and CD4 T-cell epitope challenges as those in mice treated with 100 μg of free pCI-neo-sOVA, whereas mice injected with a high dose of pCI-neo-sOVA-loaded CO₃Ap (100 μg) or with control plasmids produced negligible levels of OVA-specific antibodies or IFN-γ. Therefore, our results showed that 10 μg of pCI-neo-sOVA delivered by CO₃Ap strongly elicited humoral and cellular immune responses. This study is the first to demonstrate the promising potential of CO₃Ap nanoparticles for DNA vaccine delivery.
journal_name
Vaccinejournal_title
Vaccineauthors
He P,Takeshima SN,Tada S,Akaike T,Ito Y,Aida Ydoi
10.1016/j.vaccine.2014.09.032subject
Has Abstractpub_date
2014-10-29 00:00:00pages
6199-205issue
47eissn
0264-410Xissn
1873-2518pii
S0264-410X(14)01291-2journal_volume
32pub_type
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