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Title: Naturally acquired humoral and cellular immune responses to Plasmodium vivax merozoite surface protein 8 in patients with P. vivax infection
Authors: Yang Cheng
Bo Wang
Siriruk Changrob
Jin Hee Han
Jetsumon Sattabongkot
Kwon Soo Ha
Patchanee Chootong
Feng Lu
Jun Cao
Myat Htut Nyunt
Won Sun Park
Seok Ho Hong
Chae Seung Lim
Takafumi Tsuboi
Eun Taek Han
Kangwon National University
Jiangnan University
Anhui Medical University
Mahidol University
Jiangsu Institute of Parasitic Diseases
Department of Medical Research
Korea University
Ehime University
Keywords: Immunology and Microbiology
Issue Date: 22-May-2017
Citation: Malaria Journal. Vol.16, No.1 (2017)
Abstract: © 2017 The Author(s). Background: Thirty-one glycosylphosphatidylinositol (GPI)-anchored proteins of Plasmodium vivax, merozoite surface protein 1 (MSP1), MSP1 paralogue, MSP4, MSP5, MSP8, and MSP10 have been reported from homologs of Plasmodium falciparum by gene annotation with bioinformatics tools. These GPI-anchored proteins contain two epidermal growth factor (EGF)-like domains at its C-terminus. Here, P. vivax merozoite surface protein 8 (PvMSP8) are considered as potential targets of protective immunity. Methods: Recombinant PvMSP8 (rPvMSP8) was expressed, purified, and used for the assessment of humoral and cellular immune responses in P. vivax-infected patients and immune mice. Moreover, the target epitope of ant-PvMSP8 antibodies and subcellular localization of PvMSP8 was also determined. Results: The rPvMSP8 was successfully expressed and purified as soluble form as ~55 kDa. PvMSP8 was localized to the outer circle of pigments associated with the food vacuole. The rPvMSP8 protein had a high antigenicity (73.2% in sensitivity and 96.2% in specificity) in patients infected with P. vivax. IgG2 antibody subtype was the predominantly responses to this antigen. Antibody response to PvMSP8 increased up to day 7 and after that slightly decreased within a month. The longevity of anti-PvMSP8 antibody was stably sustained up to 12-year recovery patient samples. Most anti-PvMSP8 antibodies recognized two epitopes that were located outside the C-terminal EGF-like domain. The cellular immune response in P. vivax-exposed individuals produced high levels of IFN-γ and IL-10 upon PvMSP8 antigen stimulation in vitro. Conclusions: All data in this study suggest that PvMSP8 antigen has a potential to induce both humoral and cellular immune responses in patients with P. vivax infection. The subcellular localization of PvMSP8 confirmed that it was associated with the parasite food vacuole in blood-stage parasites. A further characterization of this protein will be useful for blood stage P. vivax vaccine development.
ISSN: 14752875
Appears in Collections:Scopus 2016-2017

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