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T helper cell responses to Opisthorchis viverrini infection associate with host susceptibility

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Abstract

Opisthorchis viverrini infection is endemic in the lower Mekong subregion. The liver is an organ that worms are drawn to and cause damage. However, the immune-related susceptibility in the liver is poorly understood. In this study, we investigated T helper (Th) cell responses in the liver of BALB/c mice and golden Syrian hamsters during 2–28 days post-infection (DPI). We found that Th cell responses were distinct between mice and hamsters in terms of dynamics and polarization. Mice exhibited the early induction of Th1, Th2, Th17, and regulatory T (Treg) cells responses after the presence of O. viverrini worms at 2 DPI. In hamsters, the late induction of Th1/Th17, downregulation of Th2/Treg responses and early elevation of suppressive cytokine interleukin (IL)-10 were found together with swift reduction of Th cell numbers. Interestingly, expressions of IL-4 (Th2 functional cytokine) and Foxp3 (Treg lineage) were completely different between mice and hamsters which elevated in mice but suppressed in hamsters. These results suggest that early induction and well-regulation are related to host resistance. In contrast, late induction of Th cell response might allow immature worms to develop in the host. Our findings provide a greater understanding in Th cell response-related susceptibility in O. viverrini infection which would be targeting immunity for the development of immune-based intervention such as vaccine.

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The authors confirm that the data supporting the findings of this study are available within the article.

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Acknowledgements

The authors would like to thank Professors Banchob Sripa and Yukifumi Nawa for their invaluable guidance throughout this study. The author would like to thank all staffs of the Northeast Laboratory Animal Center and the Animal Laboratory Unit, Faculty of Medicine, Khon Kaen University, who supported in animal experiments.

Funding

This research was supported by the Fundamental Fund of Khon Kaen University and the National Science, Research and Innovation Fund (NSRF)-FF2565. Pattaraporn Srisai was supported by a Postgraduate Study Support Grant of Faculty of Medicine, Khon Kaen University.

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Pattaraporn Srisai performed the experiments, data analysis and interpretation, and wrote the manuscript. Sujittra Chaiyadet and Amonrat Jumnainsong contributed to data interpretation, designed the experiments, and reviewed and edited the manuscript. Sutas Suttiprapa contributed to data interpretation and edited the manuscript. Chanvit Leelayuwat contributed to conceptual discussions and reviewed and edited the manuscript. Prasert Saichua initiated the conception and design of the research study, performed the experiments and data interpretation, and revised and edited the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Prasert Saichua.

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Ethical approval

Protocols for experimental practices of hamsters and mice in this study were approved by animal ethics committees of Northeast Laboratory Animal Center, Khon Kaen. The approval code is IACUC-KKU-70/64.

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The authors declare no competing interests.

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Srisai, P., Chaiyadet, S., Jumnainsong, A. et al. T helper cell responses to Opisthorchis viverrini infection associate with host susceptibility. Parasitol Res 123, 135 (2024). https://doi.org/10.1007/s00436-024-08154-9

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  • DOI: https://doi.org/10.1007/s00436-024-08154-9

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