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Hyo-Jin Kim,Bong-Kwang Jung,Jin-Joo Lee,Kyoung-Ho Pyo,Tae Yun Kim,Byung-il Choi,Tae Woo Kim,Hajime Hisaeda,Kunisuke Himeno,Eun-Hee Shin,Jong-Yil Chai 대한기생충학열대의학회 2011 The Korean Journal of Parasitology Vol.49 No.1
Relatively little has been studied on the AMA-1 vaccine against Plasmodium vivax and on the plasmid DNA vaccine encoding P. vivax AMA-1 (PvAMA-1). In the present study, a plasmid DNA vaccine encoding AMA-1 of the reemerging Korean P. vivax has been constructed and a preliminary study was done on its cellular immunogenicity to recipient BALB/c mice. The PvAMA-1 gene was cloned and expressed in the plasmid vector UBpcAMA-1, and a protein band of approximately 56.8 kDa was obtained from the transfected COS7 cells. BALB/c mice were immunized intramuscularly or using a gene gun 4 times with the vaccine, and the proportions of splenic T-cell subsets were examined by fluorocytometry at week 2 after the last injection. The spleen cells from intramuscularly injected mice revealed no significant changes in the proportions of CD8+ T-cells and CD4+ T-cells. However, in mice immunized using a gene gun, significantly higher (P<0.05) proportions of CD8+ cells were observed compared to UB vector-injected control mice. The results indicated that cellular immunogenicity of the plasmid DNA vaccine encoding AMA-1 of the reemerging Korean P. vivax was weak when it was injected intramuscularly; however, a promising effect was observed using the gene gun injection technique.