Publication: Naturally-acquired cellular immune response against Plasmodium vivax merozoite surface protein-1 paralog antigen
Issued Date
2015-04-15
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ISSN
14752875
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2-s2.0-84928010194
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Mahidol University
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SCOPUS
Bibliographic Citation
Malaria Journal. Vol.14, No.1 (2015)
Suggested Citation
Siriruk Changrob, Chaniya Leepiyasakulchai, Takafumi Tsuboi, Yang Cheng, Chae Seung Lim, Patchanee Chootong, Eun Taek Han Naturally-acquired cellular immune response against Plasmodium vivax merozoite surface protein-1 paralog antigen. Malaria Journal. Vol.14, No.1 (2015). doi:10.1186/s12936-015-0681-8 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/36115
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Title
Naturally-acquired cellular immune response against Plasmodium vivax merozoite surface protein-1 paralog antigen
Abstract
© 2015 Changrob et al.; licensee BioMed Central. Background: Plasmodium vivax merozoite surface protein-1 paralog (PvMSP1P) is a glycosylphosphatidylinositol-anchored protein expressed on the merozoite surface. This molecule is a target of natural immunity, as high anti-MSP1P-19 antibody levels were detected during P. vivax infection and the antibody inhibited PvMSP1P-erythrocyte binding. Recombinant PvMSP1P antigen results in production of a significant Th1 cytokine response in immunized mice. The present study was performed to characterize natural cellular immunity against PvMSP1P-19 and PvDBP region II in acute and recovery P. vivax infection. Methods: Peripheral blood mononuclear cells (PBMCs) from acute and recovery P. vivax infection were obtained for lymphocyte proliferation assay upon PvMSP1P-19 and PvDBP region II antigen stimulation. The culture supernatant was examined for the presence of the cytokines IL-2, TNF, IFN-γ and IL-10 by enzyme-linked immunosorbent assay (ELISA). To determine whether Th1 or Th2 have a memory response against PvMSP1P-19 and PvDBPII protein antigen, PBMCs from subjects who had recovered from P. vivax infection 8-10 weeks prior to the study were obtained for lymphocyte proliferation assay. Cytokine-producing cells were analysed by flow cytometry. Results: IL-2 was detected at high levels in lymphocyte cultures from acutely infected P. vivax patients upon PvMSP1P-19 stimulation. Analysis of the Th1 or Th2 memory response in PBMC cultures from subjects who had recovered from P. vivax infection showed significantly elevated levels of PvMSP1P-19 and PvDBPII-specific IFN-γ-producing cells (P<∈<∈<0.05). Interestingly, the response of IFN-γ-producing cells in PvMSP1P stimulation was fourfold greater in recovered subjects than that in acute-infection patients. CD4+T cells were the major cell phenotype involved in the response to PvMSP1P-19 and PvDBPII antigen. Conclusions: PvMSP1P-19 strongly induces a specific cellular immune response for protection against P. vivax compared with PvDBPII as the antigen induces activation of IFN-γ-producing effector cells following natural P. vivax exposure. Upon stimulation, PvMSP1P-19 has the potential to activate the recall response of Th1 effector memory cells that play a role in killing the parasite.