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European Journal of Immunology
Article . 2014 . Peer-reviewed
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Spatiotemporal requirements for IRF7 in mediating type I IFN‐dependent susceptibility to blood‐stage Plasmodium infection

Authors: Edwards, Chelsea L.; Best, Shannon E.; Gun, Sin Yee; Claser, Carla; James, Kylie R.; de Oca, Marcela M.; Sebina, Ismail; +6 Authors

Spatiotemporal requirements for IRF7 in mediating type I IFN‐dependent susceptibility to blood‐stage Plasmodium infection

Abstract

Type I IFN signaling suppresses splenic T helper 1 (Th1) responses during blood‐stage Plasmodium berghei ANKA (PbA) infection in mice, and is crucial for mediating tissue accumulation of parasites and fatal cerebral symptoms via mechanisms that remain to be fully characterized. Interferon regulatory factor 7 (IRF7) is considered to be a master regulator of type I IFN responses. Here, we assessed IRF7 for its roles during lethal PbA infection and nonlethal Plasmodium chabaudi chabaudi AS (PcAS) infection as two distinct models of blood‐stage malaria. We found that IRF7 was not essential for tissue accumulation of parasites, cerebral symptoms, or brain pathology. Using timed administration of anti‐IFNAR1 mAb, we show that late IFNAR1 signaling promotes fatal disease via IRF7‐independent mechanisms. Despite this, IRF7 significantly impaired early splenic Th1 responses and limited control of parasitemia during PbA infection. Finally, IRF7 also suppressed antiparasitic immunity and Th1 responses during nonlethal PcAS infection. Together, our data support a model in which IRF7 suppresses antiparasitic immunity in the spleen, while IFNAR1‐mediated, but IRF7‐independent, signaling contributes to pathology in the brain during experimental blood‐stage malaria.

Countries
Singapore, Australia, Singapore
Keywords

Immune regulation, Erythrocytes, Time Factors, Plasmodium berghei, Interferon Regulatory Factor-7, Malaria, Cerebral, Receptor, Interferon alpha-beta, Host-Parasite Interactions, T helper cells, Mice, 616, Animals, 2403 Immunology, Antibodies, Monoclonal, Brain, Th1 Cells, Malaria, Mice, Inbred C57BL, Gene Expression Regulation, Plasmodium chabaudi, 2723 Immunology and Allergy, Cytokines, Female, Interferons, Disease Susceptibility, Spleen, Signal Transduction

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    22
    popularity
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    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
22
Top 10%
Average
Top 10%
bronze