Naturally acquired immunity (NAI) to high-density parasitemia and clinical illness from P. falciparum (Pf) and P. vivax (Pv) infection develops slowly during childhood and wanes in the absence of periodic boosting from blood stage infection. Serum IgG antibodies are critical for development of this acquired immunity. The slow acquisition of NAI arises, in part, from an impaired ability to generate persisting malaria-specific memory 8 cells (MBC) and resulting long-lived Ab secreting plasma cells (LLPC) to a broad repertoire malaria Ags. Blood stage Pf and Pv may suppress generation and maintenance of malaria MBC and LLPC by virtue of their high Ag loads that elicit systemic pro-inflammatory responses, e.g. increased TNF-a, IFN-y which are eventually down-regulated (possibly explaining, in part, why many malaria infected children in endemic areas are asymptomatic). In the current proposal we examine the hypothesis that the inflammatory milieu elicited by repeated malaria infections among individuals with little or no NAI, e.g. young children and malaria naive adults, upregulates potent inhibitory feedback loops that impair generation and maintenance of MBC and LLPC. A central goal of research here is to establish a link between susceptibility to malaria infection and uncomplicated morbidity and the ability to generate and sustain malaria Ag-specific MBC. We will evaluate and compare these relationships with respect Pf and Pv since NAI to Pv develops more rapidly than to Pf under conditions of similar transmission in Papua New Guinea (PNG). The studies will be performed with collaborators from West Africa and NIH in order to determine whether these features of NAI are generalized across populations that diverge genetically and epidemiologically. While immune regulatory mechanisms will be considered broadly using gene microarray analysis of known or suspected feedback loops, inhibitory FcyRIIB that regulates the B cell receptor (BCR) activation threshold by binding malaria Ag immune complexes (IC) will be evaluated specifically. We will use biological samples and clinical/parasite data from children and adults exposed to Pv and Pf in PNG under the auspices of approved IRB protocols of the SW Pacific ICEMR. The specific objective of the project are: i) Correlate the degree of NAI with malaria Agspecific MBC frequency, breadth and durability; ii) Determine the immunoregulatory networks elicited by acute malaria and their relation to generation Pf MBC; (iii) Assess whether FCGR2B functional polymorphisms impact NAI and malaria Ag-specific MBC development.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Program--Cooperative Agreements (U19)
Project #
3U19AI089686-03S1
Application #
8477355
Study Section
Special Emphasis Panel (ZAI1-AWA-M (M1))
Project Start
Project End
Budget Start
2012-07-01
Budget End
2013-06-30
Support Year
3
Fiscal Year
2012
Total Cost
$235,750
Indirect Cost
$74,416
Name
Case Western Reserve University
Department
Type
DUNS #
077758407
City
Cleveland
State
OH
Country
United States
Zip Code
44106
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Koimbu, Gussy; Czeher, Cyrille; Katusele, Michelle et al. (2018) Status of Insecticide Resistance in Papua New Guinea: An Update from Nation-Wide Monitoring of Anopheles Mosquitoes. Am J Trop Med Hyg 98:162-165
White, Michael T; Karl, Stephan; Koepfli, Cristian et al. (2018) Plasmodium vivax and Plasmodium falciparum infection dynamics: re-infections, recrudescences and relapses. Malar J 17:170
Kurtovic, Liriye; Behet, Marije C; Feng, Gaoqian et al. (2018) Human antibodies activate complement against Plasmodium falciparum sporozoites, and are associated with protection against malaria in children. BMC Med 16:61
Koepfli, Cristian; Waltmann, Andreea; Ome-Kaius, Maria et al. (2018) Multiplicity of Infection Is a Poor Predictor of Village-Level Plasmodium vivax and P. falciparum Population Prevalence in the Southwest Pacific. Open Forum Infect Dis 5:ofy240
Liu, Eugene W; Skinner, Jeff; Tran, Tuan M et al. (2018) Protein-Specific Features Associated with Variability in Human Antibody Responses to Plasmodium falciparum Malaria Antigens. Am J Trop Med Hyg 98:57-66
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Hofmann, Natalie E; Karl, Stephan; Wampfler, Rahel et al. (2017) The complex relationship of exposure to new Plasmodium infections and incidence of clinical malaria in Papua New Guinea. Elife 6:
França, Camila Tenorio; White, Michael T; He, Wen-Qiang et al. (2017) Identification of highly-protective combinations of Plasmodium vivax recombinant proteins for vaccine development. Elife 6:
França, Camila T; Li Wai Suen, Connie S N; Carmagnac, Amandine et al. (2017) IgG antibodies to synthetic GPI are biomarkers of immune-status to both Plasmodium falciparum and Plasmodium vivax malaria in young children. Malar J 16:386

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