Abstract:
:Optimal protection against malaria may require induction of high levels of protective antibody and CD8(+) and CD4(+) T cell responses. In humans, malaria DNA vaccines elicit CD8(+) cytotoxic T cells (CTL) and IFNgamma responses as measured by short-term (ex vivo) ELISPOT assays, and recombinant proteins elicit antibodies and excellent T cell responses, but no CD8(+) CTL or CD8(+) IFNgamma-producing cells as measured by ex vivo ELISPOT. Priming with DNA and boosting with recombinant pox virus elicits much better T cell responses than DNA alone, but not antibody responses. In an attempt to elicit antibodies and enhanced T cell responses, we administered RTS,S/AS02A, a partially protective Plasmodium falciparum recombinant circumsporozoite protein (CSP) vaccine in adjuvant, to volunteers previously immunized with a P. falciparum CSP DNA vaccine (VCL-2510) and to naïve volunteers. This vaccine regimen was well tolerated and safe. The volunteers who received RTS,S/AS02A alone had, as expected, antibody and CD4(+) T cell responses, but no CD8(+) T cell responses. Volunteers who received PfCSP DNA followed by RTS,S/AS02A had antibody and CD8(+) and CD4(+) T cell responses (Wang et al., submitted). Sequential immunization with DNA and recombinant protein, also called heterologous prime-boost, led to enhanced immune responses as compared to DNA or recombinant protein alone, suggesting that it might provide enhanced protective immunity.
journal_name
Vaccinejournal_title
Vaccineauthors
Epstein JE,Charoenvit Y,Kester KE,Wang R,Newcomer R,Fitzpatrick S,Richie TL,Tornieporth N,Heppner DG,Ockenhouse C,Majam V,Holland C,Abot E,Ganeshan H,Berzins M,Jones T,Freydberg CN,Ng J,Norman J,Carucci DJ,Cohen Jdoi
10.1016/j.vaccine.2004.01.031subject
Has Abstractpub_date
2004-04-16 00:00:00pages
1592-603issue
13-14eissn
0264-410Xissn
1873-2518pii
S0264410X04000799journal_volume
22pub_type
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