期刊论文详细信息
Particle and Fibre Toxicology
Hemozoin activates the innate immune system and reduces Plasmodium berghei infection in Anopheles gambiae
Henrique Silveira2  Luzia Gonçalves1  Maria L Simões2 
[1] CEAUL, Centro de Estatística e Aplicações da Universidade de Lisboa, Lisboa, Portugal;UEI Parasitologia Médica, Centro de Malária e Outras Doenças Tropicais, Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Lisboa, Portugal
关键词: REL2;    Parasite-vector interaction;    Innate immunity;    Hemozoin;    Plasmodium;    Anopheles;   
Others  :  1148040
DOI  :  10.1186/s13071-014-0619-y
 received in 2014-04-20, accepted in 2014-12-21,  发布年份 2015
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【 摘 要 】

Background

Malaria is a worldwide infectious disease caused by Plasmodium parasites and transmitted by female Anopheles mosquitoes. The malaria vector mosquito Anopheles can trigger effective mechanisms to control completion of the Plasmodium lifecycle; the mosquito immune response to the parasite involves several pathways which are not yet well characterized. Plasmodium metabolite hemozoin has emerged as a potent immunostimulator of mammalian tissues. In this study, we aim to investigate the role of this parasite’s by-product as stimulator of Anopheles gambiae immunity to Plasmodium berghei.

Methods

Female mosquitoes were inoculated with hemozoin and the Plasmodium infection rate and intensity were measured. Differences between treatments were detected by Zero-inflated models. Microarray transcription analysis was performed to assess gene expression response to hemozoin. Genome-wide analysis results were confirmed by stimulation of Anopheles gambiae tissues and cells with hemozoin and silencing of REL2-F and its negative regulator Caspar.

Results

Gene expression profiles revealed that hemozoin activates several immunity genes, including pattern recognition receptors (PRRs) and antimicrobial peptides (AMPs). Importantly, we found that the Immune deficiency (Imd) pathway Nuclear Factor-kappaB (NF-κB) transcription factor REL2, in its full-length form REL2-F, was induced upon hemozoin treatment.

Conclusions

We have for the first time shown the impact of hemozoin treatment in Plasmodium infection, reducing both rate and intensity of the infection. We propose that hemozoin boosts the innate immunity in Anopheles, activating key effector genes involved in mosquito resistance to Plasmodium, and this activation is REL2-mediated.

【 授权许可】

   
2015 Simões et al.; licensee BioMed Central.

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