Abstract
Objective
At least 3 years of sublingual immunotherapy (SLIT) is required to achieve long-term clinical tolerance for allergens. However, immunological changes with more than 3 years of SLIT have not yet been elucidated in detail. The present study investigated whether the numbers of regulatory T (Treg) cells and regulatory B (Breg) cells increased with 4 years of SLIT and if these increases correlated with clinical effects for pollinosis.
Methods
Seven Japanese cedar pollinosis patients received SLIT in 2014 or 2015 and continued treatment until May 2019. In May 2017 and May 2019, peripheral blood mononuclear cells (PBMCs) were collected from the patients, and analyzed by flow cytometer.
Results
(1) The visual analogue scale (VAS) was significantly higher in 2019 than in 2017. (2) The percentages of Foxp3+ Treg cells, type 1 regulatory T (Tr1) cells, and Breg cells in PBMCs were significantly higher in 2019 than in 2017. (3) The percentage of Foxp3+ Treg cells in PBMCs positively correlated with VAS, whereas those of Tr1 cells and Breg cells did not.
Conclusions
These results suggest that 4 years of SLIT is needed to achieve sustained increases in Foxp3+ Treg cells, which are closely associated with the efficacy of SLIT.
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Acknowledgements
The present study was supported by research funding from JSPS KAKENHI grant number 17K11370 (to Tetsuya Terada and Takeshi Nabe) and Setsunan University (to Masaya Matsuda, Kazuyuki Kitatani and Takeshi Nabe). The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
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Tetsuya Terada, Masaya Matsuda, Kazuyuki Kitatani, Ryo Kawata, and Takeshi Nabe were involved in the study design, data collection, data interpretation, data analysis, and writing the manuscript. Miki Inaba, Junpei Hamaguchi, Naoki Takemoto, Harumi Sakae, Kennosuke Hashimoto and Hayato Shimora were involved in data collection, data interpretation, and data analysis. Yusuke Kikuoka and Yuko Inaka were involved in data collection. Takeshi Nabe has full access to the data, and is responsible for the integrity of data and final decision to submit this manuscript. All authors have approved the final version of this manuscript for submission.
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Terada, T., Matsuda, M., Inaba, M. et al. Sublingual immunotherapy for 4 years increased the number of Foxp3+ Treg cells, which correlated with clinical effects. Inflamm. Res. 70, 581–589 (2021). https://doi.org/10.1007/s00011-021-01460-3
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DOI: https://doi.org/10.1007/s00011-021-01460-3