Evidence map›Paper›PMID 31849326›Full record

ArticleMalaria journal2019

Optimization of an in vivo model to study immunity to Plasmodium falciparum pre-erythrocytic stages.

Yevel Flores-Garcia, Sonia M Herrera, Hugo Jhun, Daniel W Pérez-Ramos, C Richter King, Emily Locke, Ramadevi Raghunandan, Fidel Zavala

Open access · goldAbstract read
In one paragraph

Article in Malaria journal, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 58 papers.

0numbers the graph read from it
0cells of the map it votes in
58citing papers in PubMed
8.9field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

58 citing papers in PubMed, 84 citations in OpenAlex.

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  6. Deep learning-enabled scaffolding of spatial arrays of PfCSP epitopes.Proceedings of the National Academy of Sciences of the United States of America · 2026
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  13. iScience · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 2 institutions in 1 country.

Yevel Flores-GarciaDepartment of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA.
Sonia M HerreraDepartment of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA.
Hugo JhunDepartment of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA.
Daniel W Pérez-RamosDepartment of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA.
C Richter KingPATH Malaria Vaccine Initiative, 455 Massachusetts Avenue, NW, Suite 1000, Washington, DC, 20001, USA.
Emily LockePATH Malaria Vaccine Initiative, 455 Massachusetts Avenue, NW, Suite 1000, Washington, DC, 20001, USA.
Ramadevi RaghunandanPATH Malaria Vaccine Initiative, 455 Massachusetts Avenue, NW, Suite 1000, Washington, DC, 20001, USA.
Fidel ZavalaDepartment of Molecular Microbiology and Immunology, Malaria Research Institute, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, 21205, USA. fzavala1@jhu.edu.
Johns Hopkins University · USU.S. President's Malaria Initiative · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe circumsporozoite protein (CSP) of Plasmodium is a key surface antigen that induces antibodies and T-cells, conferring immune protection in animal models and humans. However, much of the work on CSP and immunity has been developed based on studies using rodent or non-human primate CSP antigens, which may not be entirely translatable to CSP expressed by human malaria parasites, especially considering the host specificity of the different species.

methodsUsing a genetically engineered strain of Plasmodium berghei that expresses luciferase, GFP and the Plasmodium falciparum orthologue of CSP, the effect of laboratory preparation, mosquito treatment and mouse factors on sporozoite infectivity was assessed using an in vivo bioluminescence assay on mice. This assay was compared with a PCR-based protection assay using an already described monoclonal antibody that can provide sterile protection against sporozoite challenge.

resultsBioluminescence assay demonstrated similar detection levels of the quantity and kinetics of liver-stage infection, compared to PCR-based detection. This assay was used to evaluate treatment of sporozoite and delivery method on mouse infectivity, as well as the effects of age, sex and strain of mice. Finally, this assay was used to test the protective capacity of monoclonal antibody AB317; results strongly recapitulate the findings of previous work on this antibody.

conclusionsThe PbGFP-Luc line and in vivo bioluminescence imaging provide highly sensitive read-outs of liver-stage infection in mice, and this method can be useful to reliably evaluate potency of pre-erythrocytic interventions.

Indexed as

AnimalsAnophelesFemaleHigh-Throughput Screening AssaysLiverLuciferasesMalariaMaleMiceMice, Inbred BALB CMicroorganisms, Genetically-ModifiedPlasmodium bergheiPlasmodium falciparumProtozoan ProteinsSporozoitescircumsporozoite protein, ProtozoanLuciferasesProtozoan ProteinsBioluminescenceMalariaPlasmodium falciparumTransgenic parasiteVaccine

Identifiers

PMID31849326
PMCPMC6918627
OpenAlexW2995069504

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.