Association of toll-like receptors in malaria susceptibility and immunopathogenesis: A meta-analysis
Aína Danaisa Ramirez Ramirez,
Myrela Conceição Santos de Jesus,
Júlia Rossit,
Nathália Faria Reis,
Marcelo Cerilo Santos-Filho,
Adriana Pittella Sudré,
Joseli de Oliveira-Ferreira,
Andrea Regina de Souza Baptista,
Luciane Moreno Storti-Melo,
Ricardo Luiz Dantas Machado
Affiliations
Aína Danaisa Ramirez Ramirez
Center for Microorganisms' Investigation, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
Myrela Conceição Santos de Jesus
Center for Microorganisms' Investigation, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil; Laboratory of Molecular Genetics and Biotechnology, Department of Biology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
Júlia Rossit
Center for Microorganisms' Investigation, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
Nathália Faria Reis
Center for Microorganisms' Investigation, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
Marcelo Cerilo Santos-Filho
Center for Microorganisms' Investigation, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
Adriana Pittella Sudré
Laboratory of Parasites Molecular Biology, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
Joseli de Oliveira-Ferreira
Laboratory of Immunoparasitology, FIOCRUZ, Rio de Janeiro, Rio de Janeiro, Brazil
Andrea Regina de Souza Baptista
Center for Microorganisms' Investigation, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil
Luciane Moreno Storti-Melo
Laboratory of Molecular Genetics and Biotechnology, Department of Biology, Center for Biological and Health Sciences, Federal University of Sergipe, São Cristóvão, Sergipe, Brazil
Ricardo Luiz Dantas Machado
Center for Microorganisms' Investigation, Department of Microbiology and Parasitology, Biomedical Institute, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil; Corresponding author.
Toll-like receptors (TLRs) play a key role in the induced immune response in malaria. Although the potential roles of TLRs have been described, it is necessary to elucidate which of these receptors may actually have an impact on the immunopathogenesis of the disease. This article performed a meta-analysis adhered to the PRISMA statement on TLRs studied in malaria by Plasmodium falciparum and Plasmodium vivax and its impact on susceptibility and pathogenesis during malaria. A search of the literature was undertaken in PubMed, LILACS and SciELO published until June 30th, 2020. The risk of bias was calculated using the Joanna Briggs Institute's Critical Review Checklist. Later, based on the inclusion and/or exclusion criteria, 17 out of 296 articles were harvested for this systematic review, the meta-analysis included studies incorporating 6,747 cases and 8,983 controls. The results showed that only TLR1, TLR9 and TLR4 receptors were associated with parasitemia, TLR2 and TLR6 were related with severity and none TLR was correlated with susceptibility. The data described here should be taken with caution, since the current evidence is limited and inconsistent. More studies are needed given that the results may change depending on the region and genetic background of the populations.
