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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
Tr1 and naturally occurring regulatory T cells induce IgG4 in B cells through GITR/GITR-L interaction, IL-10 and TGF-β
European Journal of Immunology, Volume 38, No. 11, Year 2008
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Description
Regulatory T cells exert their function through the modulation of both T and B cell responses. Our previous studies demonstrated that IL-10-producing Treg (Tr1) can induce B cells to secrete IgG4 in a cell-contact-dependent manner. The benefit of such non-inflammatory B-cell responses is apparent in the hyporesponsive state of patients with helminth infections such as Onchocerciasis. Here, we investigated the mechanisms involved to induce IgG4, within B:Tr-cell co-cultures, using IL-10-producing tetanus-toxoid-specific regulatory T cell lines and clones (Tr-TCC) from human PBMC. During the generation process, we found that increasing Foxp3 levels in regulatory T cell lines correlated with their ability to induce IgG4 in B cells. Using Tr-TCC, we found that blocking glucocorticoid-induced tumour necrosis factor receptor-related protein (GITR) molecules selectively prevented IgG4 production as did neutralizing Ab to glucocorticoid-induced tumour necrosis factor receptor-related protein ligand (GITR-L), IL-10 and TGF-β. Furthermore, the prevention of IgG4 induction by anti-GITR Ab was reversed by excess rIL-10 but not rTGF-β. In contrast, anti-ICOS and anti-CTLA-4 Abs had no effect. When compared with Tr-TCC, freshly isolated CD4+CD25+ T cells, but not effector T cell populations, induced low levels of IgG4, which were also blocked by anti-GITR and anti-GITR-L Ab. Thus, the mechanism of IgG4 induction by regulatory cells involves GITR-GITR-L interactions, IL-10 and TGF-β. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Authors & Co-Authors
Satoguina, Judith S.
Germany, Bonn
Universitätsklinikum Bonn
Gambia, Banjul
Medical Research Council Laboratories Gambia
Adjobimey, Tomabu
Germany, Bonn
Universitätsklinikum Bonn
Arndts, Kathrin
Germany, Bonn
Universitätsklinikum Bonn
Hoch, Jochen
Germany, Bonn
Universitätsklinikum Bonn
Oldenburg, Johannes
Germany, Bonn
Universitätsklinikum Bonn
Layland, Laura E.
Germany, Bonn
Universitätsklinikum Bonn
Hoerauf, Achim M.
Germany, Bonn
Universitätsklinikum Bonn
Statistics
Citations: 112
Authors: 7
Affiliations: 2
Identifiers
Doi:
10.1002/eji.200838193
e-ISSN:
15214141
Research Areas
Cancer
Infectious Diseases