Journal
JOURNAL OF IMMUNOLOGY
Volume 196, Issue 4, Pages 1636-1645Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.1500516
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Funding
- Swedish Research Council [K2012-66X-14928-09-5, K2012-55X-13147-14-5]
- Cancerfonden
- Foundations of Osterlund
- Greta and Johan Kock Foundation
- Gustav V 80 Years Anniversary Foundation
- Knut and Alice Wallenberg Foundation
- Inga-Britt and Arne Lundberg Foundation
- Skane University Hospital
- ALF
- Anna-Greta Crafoord Foundation for Rheumatological Research
- Wellcome Trust Investigator Award
- Medical Research Council [MR/J006742/1]
- European Union
- National Institute for Health Research Biomedical Research Centre based at Guy's and St. Thomas' National Health Service Foundation Trust and King's College London
- MRC [G1002165] Funding Source: UKRI
- Medical Research Council [G1002165, MR/J006742/1] Funding Source: researchfish
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CD46 is a cell surface complement inhibitor widely expressed in human tissues, in contrast to mice, where expression is limited to the testes. In humans, it has been identified as an important T cell costimulatory receptor, and patients deficient in CD46 or its endogenous ligands are unable to mount effective Th1 T cell responses. Stimulation of human CD4(+) T cells with CD3 and CD46 also leads to the differentiation of a switched Th1 population, which shuts down IFN-gamma secretion and upregulates IL-10 and is thought to be important for negative feedback regulation of the Th1 response. In the present study, we show that CD46 costimulation leads to amplified microRNA (miR) expression changes in human CD4(+) T cells, with associated increases in activation more potent than those mediated by the classic costimulator CD28. Blockade of cell surface CD46 inhibited CD28-mediated costimulation, identifying autocrine CD46 signaling as downstream of CD28. We also identify a downregulation of miR-150 in CD46-costimulated T cells and identify the glucose transporter 1 encoding transcript SLC2A1 as a target of miR-150 regulation, connecting miR-150 with modulation of glucose uptake. We also investigated microRNA expression profiles of CD46-induced switched IL-10-secreting Th1 T cells and found increased expression of miR-150, compared with IFN-gamma-secreting Th1 cells. Knockdown of miR-150 led to a reduction in IL-10 but not IFN-gamma. CD46 therefore controls both Th1 activation and regulation via a miR-150-dependent mechanism.
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