Abstract
Oral infection of mice with several strains of Toxoplasma gondii results in intestinal pathological lesions, which contributes to the invasion of this parasite. However, the exact mechanism is unclear, and only a few strains have been explored. Here, T. gondii TgSheepCHn5 and TgRedpandaCHn1 strains from sheep and red panda were evaluated. The TgSheepCHn5 and TgRedpandaCHn1 strains induced intestinal lesions, loss of Paneth cells, and gut commensal bacteria dysbiosis in Swiss Webster mice. The lesions and loss of Paneth cells were dependent on IFN-γ and gut commensal bacteria during T. gondii infection. Deleting IFN-γ or gut commensal bacteria suppressed the Th1 immune response, alleviated the lesions and parasite loading, and upregulated the number of Paneth cells. Loss of IFN-γ production accelerated mice death, whereas the deletion of gut commensal bacteria enhanced the survival time of the host. The Th1 cell immune responses have positive and negative effects on toxoplasmosis, resistance to T. gondii infection, and acceleration intestine lesions. Adjustment of Th1 cell responses and gut commensal bacteria may be effective treatments for toxoplasmosis.
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Data availability
The data supporting the findings of this study are available from the corresponding author upon reasonable request. The TgSheepCHn5, TgRedpandaCHn1, and VEG strains were cryopreserved and available for further analysis.
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Acknowledgements
We thank Jitender Prakash Dubey (US Department of Agriculture, Beltsville, MD, USA) for providing the VEG T. gondii strain and primary antibody against T. gondii. We are also grateful to Shimin Zheng (Northeast Agricultural University, China), Chunlei Su (University of Tennessee, Knoxville, USA), and Shuai Wang (Lanzhou Veterinary Research Institute, China) for their valuable suggestions. We thank Caili Zhang and Xianghua Liu of the TEM Center at the Henan University of Chinese Medicine for their assistance.
Funding
This study was financed by the Henan Province Modern Agricultural Industrial Technology System, China (mutton sheep: HARS-22-15-G1).
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SRJ performed the laboratory tests and data analysis and wrote the manuscript. YRY designed the study protocol, analyzed the results, and wrote the manuscript. Both authors have read and approved the final version of the manuscript.
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The experimental protocol was established according to the ethical guidelines of the Institutional Animal Use Committee of Henan Agricultural University (China). The protocol was approved by the Beijing Association for Science and Technology (SYXK [Beijing] 2007–0023).
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Su, R., Yang, Y. Gut commensal bacteria exacerbate toxoplasmosis associated with TgSheepCHn5 (ToxoDB#2) and TgRedpandaCHn1 (ToxoDB#20) through Th1 immune response. Parasitol Res 122, 2795–2806 (2023). https://doi.org/10.1007/s00436-023-07962-9
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DOI: https://doi.org/10.1007/s00436-023-07962-9