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01.12.2017 | Research article | Ausgabe 1/2017 Open Access

Plasmodium falciparum malaria parasite var gene expression is modified by host antibodies: longitudinal evidence from controlled infections of Kenyan adults with varying natural exposure

Zeitschrift:: BMC Infectious Diseases > Ausgabe 1/2017

Autoren:: Abdirahman I. Abdi, Susanne H. Hodgson, Michelle K. Muthui, Cheryl A. Kivisi, Gathoni Kamuyu, Domtila Kimani, Stephen L. Hoffman, Elizabeth Juma, Bernhards Ogutu, Simon J. Draper, Faith Osier, Philip Bejon, Kevin Marsh, Peter C. Bull

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Abstract

Background

The PfEMP1 family of Plasmodium falciparum antigens play a key role in pathogenesis of severe malaria through their insertion into the surface of parasite infected erythrocytes, and adhesion to host cells. Previous studies have suggested that parasites expressing PfEMP1 subclasses group A and DC8, associated with severe malaria, may have a growth advantage in immunologically naïve individuals. However, this idea has not been tested in longitudinal studies.

Methods

Here we assessed expression of the var genes encoding PfEMP1, in parasites sampled from volunteers with varying prior exposure to malaria, following experimental infection by sporozoites (PfSPZ). Using qPCR, we tested for associations between the expression of various var subgroups in surviving parasite populations from each volunteer and 1) the levels of participants’ antibodies to infected erythrocytes before challenge infection and 2) the apparent in vivo parasite multiplication rate.

Results

We show that 1) expression of var genes encoding for group A and DC8-like PfEMP1 were associated with low levels of antibodies to infected erythrocytes (αIE) before challenge, and 2) expression of a DC8-like CIDRα1.1 domain was associated with higher apparent parasite multiplication rate in a manner that was independent of levels of prior antibodies to infected erythrocytes.

Conclusions

This study provides insight into the role of antibodies to infected erythrocytes surface antigens in the development of naturally acquired immunity and may help explain why specific PfEMP1 variants may be associated with severe malaria.

Trial registration

Pan African Clinical Trial Registry: PACTR201211000433272. Date of registration: 10th October 2012.

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Titel: Plasmodium falciparum malaria parasite var gene expression is modified by host antibodies: longitudinal evidence from controlled infections of Kenyan adults with varying natural exposure
Autoren:: Abdirahman I. Abdi
Susanne H. Hodgson
Michelle K. Muthui
Cheryl A. Kivisi
Gathoni Kamuyu
Domtila Kimani
Stephen L. Hoffman
Elizabeth Juma
Bernhards Ogutu
Simon J. Draper
Faith Osier
Philip Bejon
Kevin Marsh
Peter C. Bull
Publikationsdatum: 01.12.2017
DOI: https://doi.org/10.1186/s12879-017-2686-0
Verlag: BioMed Central
Zeitschrift: BMC Infectious Diseases BMC series – open, inclusive and trusted
Ausgabe 1/2017
Elektronische ISSN: 1471-2334

Springer Medizin

Abstract

Background

Methods

Results

Conclusions

Trial registration

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