Abstract
Purpose
Immunological abnormalities have been hypothesized as a pathogenesis of biliary atresia (BA). We previously investigated the frequency and function of circulating regulatory T-cells (Tregs) and reported no differences compared to controls. However, the local Treg profile remains uncertain. We aimed to investigate the frequency of Tregs in BA liver tissues.
Methods
The number of lymphocytes, CD4+ cells, and CD4+FOXP3+ Tregs infiltrating the portal tract and the percentage of Tregs among CD4+ cells of BA and control patients were visually counted. The correlation between these data and clinical indicators was also examined.
Results
The number of lymphocytes, CD4+ cells, and CD4+FOXP3+ Tregs was higher in the BA group. However, the percentage of Tregs among CD4+ cells was similar in both groups. Each parameter was correlated with serum γ-GTP, but there was no clear association with liver fibrosis, jaundice clearance, and native liver survival.
Conclusion
The number of Tregs infiltrating the portal tract was higher in BA patients. However, the infiltration of lymphocytes was also generally increased. Tregs appear to be unsuccessful in suppressing progressive inflammation in BA patients, despite recruitment to local sites. Investigation of Treg function in the local environment is warranted.
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Data availability
The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors thank Ms. Takana Motoyoshi (K. I. Stainer, Inc.) for their technical assistance.
Funding
This work was supported by JSPS KAKENHI (Grant Numbers 15K10917 and 18K08535). None of the authors have any relevant financial or non-financial interests to disclose.
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Conceptualization: SO, TS; Methodology: SO, RH, J-II; Formal analysis and investigation: SO, RH, TF, YK; Writing—original draft preparation: SO; Writing—review and editing: KT, SK, AT, TH; Funding acquisition: TS; Supervision: J-II, TH. All authors read and approved the final manuscript.
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This study was performed in line with the principles of the Declaration of Helsinki. This study was approved by the Ethics Committee of the Graduate School of Medicine, Chiba University (approval number 908) and the Institutional Review Board of Chiba Children’s Hospital (2017–046).
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383_2023_5547_MOESM1_ESM.tiff
Online Resource 1: Correlation between fibrosis score and frequency of infiltrating cells to the portal tract (a) The number of lymphocytes/10,000 μm2 [mild (I): 26 ± 12; moderate (II): 34 ± 14; p = 0.22] (b) The mean number of CD4+ cells [mild (I): 11 ± 8.8; moderate (II): 2 4 ± 15; p = 0.05] (c) The mean number of CD4+FOXP3+ cells [mild (I): 3.2 ± 2.7; moderate (II): 8.0 ± 5.7; p = 0.05] (d) The percentage of Tregs among CD4+ cells (CD4+FOXP3+ Tregs/CD4+ cells) [mild (I): 0.30 ± 0.12; moderate (II): 0.32 ± 0.11; p = 0.66]. Supplementary file1 (TIFF 2209 KB)
383_2023_5547_MOESM2_ESM.tiff
Online Resource 2: Correlation between jaundice clearance and frequency of infiltrating cells to the portal tract (a) The number of lymphocytes/10,000μm2 (failed jaundice clearance: 30 ± 18; achieved jaundice clearance: 38 ± 11) (b) The mean number of CD4+ cells (failed: 31 ± 18; achieved: 25 ± 11) (c) The mean number of CD4+FOXP3+ cells (failed: 12±7.6; achieved: 7.4±3.7) (d) The percentage of Tregs among CD4+ cells (CD4+FOXP3+ Tregs/CD4+ cells) (failed: 0.37 ± 0.033; achieved: 0.30 ± 0.11). Supplementary file2 (TIFF 2313 KB)
383_2023_5547_MOESM3_ESM.tiff
Online Resource 3: Correlation between outcome at 3 years and frequency of infiltrating cells to the portal tract (a) The number of lymphocytes/10,000 μm2 [native liver: 35 ± 10; transplanted: 37 ± 18; p = 0.87] (b) The mean number of CD4+ cells [native liver: 21 ± 3.7; transplanted: 36 ± 16; p = 0.07] (c) The mean number of CD4+FOXP3+ cells [native liver: 6.2 ± 2.4; transplanted: 12 ± 5.5; p = 0.07] (d) The percentage of Tregs among CD4+ cells (CD4+FOXP3+ Tregs/CD4+ cells) [native liver: 0.30 ± 0.13; transplanted: 0.34 ± 0.051; p = 0.61]. Supplementary file3 (TIFF 2443 KB)
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Oita, S., Saito, T., Hashimoto, R. et al. Frequency of infiltrating regulatory T-cells in the portal tract of biliary atresia. Pediatr Surg Int 39, 259 (2023). https://doi.org/10.1007/s00383-023-05547-2
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DOI: https://doi.org/10.1007/s00383-023-05547-2