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Profile of T and B lymphocytes in individuals resistant to Schistosoma mansoni infection

  • Immunology and Host-Parasite Interactions - Original Paper
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Abstract

The mechanisms involved in the development of resistance to infection/reinfection by Schistosoma mansoni still arouse great interest and controversy. Some authors demonstrate that resistance to infection is attributed to a mixed Th1 and Th2 response and resistance to reinfection after repeated treatments through mechanisms associated with the Th2 response. Through flow cytometry, the phenotypic characterization of B and T lymphocytes in individuals residing in endemic areas with low parasite loads over 10 years was evaluated for the first time in humans. In this study, individuals with low parasite loads for Schistosoma mansoni had a higher proportion of Th1 and Th2 cells. In addition, lymphocytes from these individuals showed a higher degree of expression of costimulatory molecules CD28 and CTLA-4 and regulatory molecules FoxP3 and IL-10, when compared to individuals with high parasite loads. Our data indicate that the control of the parasite load of S. mansoni must be associated with a Th1, Th2, and regulatory response, and that further studies are needed to elucidate the possibility of mechanisms associated with the hyporesponsiveness of lymphocytes from individuals with high parasite loads.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This work was supported by the Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB), EDITAL 014/2013 – Apoio a Projetos de Pesquisa em Doenças Negligenciadas e do Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq/MST/INCT-DT, grant number 465229/2014-0.

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by all authors. The first draft of the manuscript was written by Robson da Paixão de Souza and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Luciana Santos Cardoso.

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Ethics approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. The study was approved by the Ethics Committee of the Gonçalo Moniz Research Center – CPqGM/Fiocruz/Ba (Opinion/Resolution n° 385.806 – 05/09/2013).

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Informed consent was obtained from all individual participants included in the study.

Conflict of interest

The authors declare no competing interests.

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Section Editor: Robin Flynn

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da Paixão de Souza, R., Araújo, M.I., Lopes, D.M. et al. Profile of T and B lymphocytes in individuals resistant to Schistosoma mansoni infection. Parasitol Res 121, 951–963 (2022). https://doi.org/10.1007/s00436-022-07435-5

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  • DOI: https://doi.org/10.1007/s00436-022-07435-5

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