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Naturally acquired immune responses to thrombospondin-related adhesion protein (TRAP) of Plasmodium vivax in patients from areas of unstable malaria transmission.

Abstract：

:A key tool for the control, elimination, and eradication of Plasmodium vivax is the development of an effective vaccine. The thrombospondin-related adhesion protein (TRAP) is one of the major sporozoite antigens that plays an important role in the invasion of mosquito salivary glands and hepatocytes by sporozoites. The main goal of this study was to evaluate the naturally acquired antibodies to the P. vivax TRAP (PvTRAP) in patients from malaria-endemic areas of Iran (n=116), Afghanistan (n=50), and Pakistan (n=50). The PvTRAP gene was expressed in Escherichia coli Rosetta (DE3)-pET23a and used as antigen in enzyme-linked immunosorbent assay (ELISA). The profile of immunoglobulin G (IgG) isotype and the avidity of IgG, IgG1, and IgG3 to PvTRAP, as well as the association between anti-PvTRAP isotype responses and host age were evaluated. Only 42.24% of Iranian, 38% of Afghani, and 44% of Pakistani patients infected with P. vivax had positive anti-PvTRAP IgG, and the prevalence of responders in the three countries did not differ significantly (P>0.05). Moreover, the prevalence of IgG1 and IgG3 antibody responses to PvTRAP showed no significant correlation with age (P>0.05). Individuals exposed to vivax malaria in the unstable malaria transmission areas are able to produce antibodies to the TRAP antigen at all ages in response to P. vivax infections. Finally, the presence of mature IgG1 and IgG3 antibodies with high to intermediate avidity against PvTRAP antigen (>60%) provide more information to understand the interactions between the host and P. vivax parasite. In summary, the present study provides data that support the rational development of an effective pre-erythrocytic stage vaccine based on PvTRAP antigen.

journal_name

Acta Trop

journal_title

Acta tropica

authors

Nazeri S,Zakeri S,Mehrizi AA,Djadid ND

doi

10.1016/j.actatropica.2017.05.026

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

45-54

eissn

0001-706X

issn

1873-6254

pii

S0001-706X(17)30063-3

journal_volume

173

pub_type

杂志文章

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