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Intravenous immunoglobulin therapy enhances suppressive regulatory T cells and decreases innate lymphoid cells in children with immune thrombocytopenia
Author(s) -
Wang ShihChung,
Yang Kuender D.,
Lin ChingYuang,
Huang Alex Y.,
Hsiao ChienChou,
Lin MingTsan,
Tsai YiGiien
Publication year - 2020
Publication title -
pediatric blood and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.116
H-Index - 105
eISSN - 1545-5017
pISSN - 1545-5009
DOI - 10.1002/pbc.28075
Subject(s) - medicine , immune thrombocytopenia , immunology , innate lymphoid cell , immune system , myeloid , platelet , il 2 receptor , peripheral blood mononuclear cell , antibody , t cell , immunity , in vitro , biochemistry , chemistry
Abstract Background This study aimed to investigate the relationship between CD4 + regulatory T cells (Tregs) and innate lymphoid cells (ILCs) in children with primary immune thrombocytopenia (ITP) undergoing high‐dose intravenous immunoglobulin (IVIG) therapy. Methods We enrolled a cohort of 30 children with newly diagnosed ITP and 30 healthy controls and collected blood samples for levels of Tregs, ILCs, relevant cytokines, and Treg suppression assay at the diagnosis, two days, four weeks, and one year (only platelet count) after high‐dose IVIG treatment. IVIG partial responders was defined by a platelet count less than 100 × 10 9 /L at 12 months after IVIG treatment. Results Children with newly diagnosed ITP exhibited elevated levels of ILC1, ILC2, ILC3, Th17, myeloid dendritic cells (DCs), plasmacytoid DCs, and serum IFN‐γ and IL‐17A levels, accompanied by a decrease in IL‐10‐producing Tregs. High‐dose IVIG therapy reversed these aberrations. Platelet counts positively correlated with Tregs ( rho = 0.72) and negatively correlated with both ILC1 ( rho = −0.49) and ILC3 ( rho = −0.60) ( P < 0.05). Significantly lower Tregs and higher ILC1, ILC3, DCs, and serum IL‐17A levels were noted in the partial responders ( n = 8) versus responders ( n = 22; P < 0.05). We found that Tregs suppressed proliferation of ILCs and CD4 + T cells in CD25‐depleted peripheral PBMCs and enhanced the apoptosis of CD4 + CD45RO + T cells in vitro following IVIG therapy. Conclusions Effective high‐dose IVIG therapy for children with newly diagnosed ITP appears to result in the induction of Tregs, which suppresses ILC proliferation in vitro and is associated with platelet response.