Abstract
Background
The engagement of the complement regulatory proteins CD46 and CD3 in human CD4+ T cells induces the type 1 regulatory T cells (Tr1) and interleukin-10 (IL-10) secretion. This study aimed to elucidate the molecular changes of Tr1 cells through CD46 cytoplasmic Cyt1 tail in lupus nephritis (LN) respond to intravenous methylprednisolone (ivMP) therapy.
Methods
We enrolled 40 pediatric patients with LN and 30 healthy controls. Clinical characteristics and peripheral blood mononuclear cells were collected before and 3 days after the administration of ivMP. Kidney specimens were taken from five LN and five minimal-change nephrotic syndrome patients.
Results
We found that defective CD46-mediated T-helper type 1 contraction (IL-10 switching) is present in active LN patients. The ivMP therapy enhanced LN remission, restored the production of IL-10, increased the CD46-Cyt1/Cyt2 ratio, AKT, and cAMP-responsive element-binding protein phosphorylation, and induced migration with the expression of chemokine receptor molecules CCR4, CCR6, and CCR7 of CD3/CD46-activated Tr1 cells.
Conclusions
Pharmacologic interventions that alter the patterns of CD46-Cyt1/Cyt2 expression and the secretion of IL-10 by CD3/CD46-activated Tr1 cells can be used in patients with active LN.
Impact
-
In patients with LN, ivMP was associated with increased IL-10 production and increased CD46-Cyt1/Cyt2 ratio and AKT phosphorylation by Tr1 cells, with enhanced potential to migration in response to CCL17.
-
These results suggest that expression levels of CD46 isoforms Cyt1 and Cyt2 in CD4 + CD46 + Tr1 cells differ in patients with active LN but can be corrected by corticosteroid treatment.
-
Enhancing the expression of functional CD4 + CD46 + Tr1 cells may be a useful therapeutic approach for LN.
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Funding
This work was partially supported by grants from the Ministry of Science and Technology, Taiwan (MOST 106-2314-B-371-008 and MOST 107-2314-B-371-011-MY2), from Changhua Christian Hospital, Taiwan (110-CCH-IRP-030, 110-CCH-ICO-152, 106-CCH-IRP-079, 108-CCH-IRP-051; (Y_105_0246) (Y_105_0023) (Y_105_0050)), and from China Medical University Hospital, Taiwan (DMR-100-180), and Academia Sinica, Taiwan (AS-SS-111-02-1).
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Y.-G.T., J.-W.C., K.-H.H., and C.-Y.L.: conceptualized and designed the study, performed the experiments, drafted the initial manuscript, and approved the final manuscript as submitted. Y.-M.C., T.-C.S., and P.-F.C.: carried out the initial analyses, reviewed and revised the manuscript, and approved the final manuscript as submitted.
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Tsai, YG., Chien, JW., Chiu, YM. et al. Lupus nephritis with corticosteroid responsiveness: molecular changes of CD46-mediated type 1 regulatory T cells. Pediatr Res 92, 1099–1107 (2022). https://doi.org/10.1038/s41390-021-01882-z
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DOI: https://doi.org/10.1038/s41390-021-01882-z


