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Malaria Journal
Published in: Malaria Journal 1/2020

Open Access 01-12-2020 | Malaria | Research

Immunogenicity analysis of conserved fragments in Plasmodium ovale species merozoite surface protein 4

Authors: Juliette Uwase, Ruilin Chu, Kokouvi Kassegne, Yao Lei, Feihu Shen, Haitian Fu, Yifan Sun, Yinghua Xuan, Jun Cao, Yang Cheng

Published in: Malaria Journal | Issue 1/2020

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Abstract

Background

There is an urgent need for an effective vaccine to control and eradicate malaria, one of the most serious global infectious diseases. Plasmodium merozoite surface protein 4 (MSP4) has been listed as a blood-stage subunit vaccine candidate for malaria. Infection with Plasmodium ovale species including P. ovale wallikeri and P. ovale curtisi, is also a source of malaria burden in tropical regions where it is sometimes mixed with other Plasmodium species. However, little is known about P. ovale MSP4.

Methods

The msp4 gene was amplified through polymerase chain reaction using genomic DNA extracted from blood samples of 46 patients infected with P. ovale spp. and amplified products were sequenced. Open reading frames predicted as immunogenic peptides consisting of 119 and 97 amino acids of P. ovale curtisi MSP4 (PocMSP4) and P. ovale wallikeri MSP4 (PowMSP4), respectively, were selected for protein expression. Recombinant proteins (rPoMSP4) were expressed in Escherichia coli, purified, analysed, and immunized in BALB/c mice. The specificity of anti-MSP4-immunoglobulin (Ig) G antibodies was evaluated by Western blot and enzyme-linked immunosorbent assays, and cellular immune responses were analysed via lymphocyte proliferation assays.

Results

Full peptide sequences of PocMSP4 and PowMSP4 were completely conserved in all clinical isolates, except in the epidermal growth factor-like domain at the carboxyl terminus where only one mutation was observed in one P. o. wallikeri isolate. Further, truncated PoMSP4 segments were successfully expressed and purified as ~ 32 kDa proteins. Importantly, high antibody responses with end-point titres ranging from 1:10,000 to 1:2,560,000 in all immunized mouse groups were observed, with high IgG avidity to PocMSP4 (80.5%) and PowMSP4 (92.3%). Furthermore, rPocMSP4 and rPowMSP4 cross-reacted with anti-PowMSP4-specific or anti-PocMSP4-specific antibodies. Additionally, anti-PoMSP4 IgG antibodies showed broad immuno-specificity in reacting against rPoMSP1 and rPoAMA1. Lastly, PocMSP4- and PowMSP4-immunized mice induced cellular immune responses with PocMSP4 (36%) and PowMSP4 cells (15.8%) during splenocyte proliferation assays.

Conclusion

Findings from this study suggest conservation in PoMSP4 protein sequences and high immunogenicity was observed in rPoMSP4. Furthermore, induction of immune responses in PocMSP4- and PowMSP4-immunized mice informed that both humoral and cellular immune responses play crucial roles for PoMSP4 in protection.
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Metadata
Title
Immunogenicity analysis of conserved fragments in Plasmodium ovale species merozoite surface protein 4
Authors
Juliette Uwase
Ruilin Chu
Kokouvi Kassegne
Yao Lei
Feihu Shen
Haitian Fu
Yifan Sun
Yinghua Xuan
Jun Cao
Yang Cheng
Publication date
01-12-2020
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2020
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/s12936-020-03207-7

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