Journal article
Plasmodium falciparum liver stage infection to stable blood stage infection in liver-humanized and blood-humanized FRGN KO mice enables testing of blood stage inhibitory antibodies (reticulocyte-binding protein homolog 5) in vivo
- Abstract:
- The invention of liver-humanized mouse models has made it possible to directly study the preerythrocytic stages ofPlasmodium falciparum. In contrast, the current models to directly study blood stage infectionin vivoare extremely limited. Humanization of the mouse blood stream is achievable by frequent injections of human red blood cells (hRBCs) and is currently the only system with which to study human malaria blood stage infections in a small animal model. Infections have been primarily achieved by direct injection ofP. falciparum-infected RBCs but as such, this modality of infection does not model the natural route of infection by mosquito bite and lacks the transition of parasites from liver stage infection to blood stage infection. Including these life cycle transition points in a small animal model is of relevance for testing therapeutic interventions. To this end, we used FRGN KO mice that were engrafted with human hepatocytes and performed a blood exchange under immune modulation to engraft the animals with more than 50% hRBCs. These mice were infected by mosquito bite with sporozoite stages of a luciferase-expressingP. falciparumparasite, resulting in noninvasively measurable liver stage burden byin vivobioluminescent imaging (IVIS) at days 5-7 postinfection. Transition to blood stage infection was observed by IVIS from day 8 onward and then blood stage parasitemia increased with a kinetic similar to that observed in controlled human malaria infection. To assess the utility of this model, we tested whether a monoclonal antibody targeting the erythrocyte invasion ligand reticulocyte-binding protein homolog 5 (with known growth inhibitory activityin vitro) was capable of blocking blood stage infectionin vivowhen parasites emerge from the liver and found it highly effective. Together, these results show that a combined liver-humanized and blood-humanized FRGN mouse model infected with luciferase-expressingP. falciparumwill be a useful tool to studyP. falciparumpreerythrocytic and erythrocytic stages and enables the testing of interventions that target either one or both stages of parasite infection.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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(Preview, Version of record, pdf, 765.1KB, Terms of use)
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- Publisher copy:
- 10.3389/fimmu.2018.00524
Authors
- Publisher:
- Frontiers Media
- Journal:
- Frontiers in Immunology More from this journal
- Volume:
- 9
- Pages:
- 524
- Publication date:
- 2018-03-14
- Acceptance date:
- 2018-02-28
- DOI:
- EISSN:
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1664-3224
- Language:
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English
- Keywords:
- Pubs id:
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pubs:832165
- UUID:
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uuid:4d104f3d-f549-4a62-9ca0-28257320b1cb
- Local pid:
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pubs:832165
- Source identifiers:
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832165
- Deposit date:
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2018-04-04
Terms of use
- Copyright holder:
- Draper et al
- Copyright date:
- 2018
- Notes:
- © 2018 Foquet, Schafer, Minkah, Alanine, Flannery, Steel, Sack, Camargo, Fishbaugher, Betz, Nguyen, Billman, Wilson, Bial, Murphy, Draper, Mikolajczak and Kappe. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
- Licence:
- CC Attribution (CC BY)
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