1. Effect of interferon-β1b on CXCR4-dependent chemotaxis in T cells from multiple sclerosis patients.
- Author
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Wostradowski T, Gudi V, Pul R, Gingele S, Lindquist JA, Stangel M, and Lindquist S
- Subjects
- Adult, Blotting, Western, Cell Movement drug effects, Cells, Cultured, Female, Gene Expression drug effects, Gene Expression immunology, Humans, Male, Middle Aged, Multiple Sclerosis, Relapsing-Remitting genetics, Multiple Sclerosis, Relapsing-Remitting immunology, Receptors, CXCR4 genetics, Reverse Transcriptase Polymerase Chain Reaction, Signal Transduction drug effects, T-Lymphocytes immunology, T-Lymphocytes metabolism, Time Factors, Young Adult, Chemotaxis drug effects, Interferon beta-1b pharmacology, Receptors, CXCR4 metabolism, T-Lymphocytes drug effects
- Abstract
Multiple sclerosis (MS) is an inflammatory, demyelinating and neurodegenerative disease triggered by infiltration of activated T cells into the central nervous system. Interferon (IFN)-β is an established, safe and effective treatment for patients with relapsing-remitting MS (RRMS). The cytokine can inhibit leucocyte infiltration into the central nervous system; however, little is known about the precise molecular mechanisms. Previously, in vitro application of IFN-β1b was shown to reduce CXCL12/CXCR4-mediated monocyte migration. Here, we analysed the effects of IFN-β1b on CXCR4-dependent T cell function. In vitro exposure to IFN-β1b (1000 U/ml) for 20 h reduced CXCR4-dependent chemotaxis of primary human T cells from healthy individuals and patients with RRMS. Investigating the IFN-β1b/CXCR4 signalling pathways, we found no difference in phosphorylation of ZAP70, ERK1/2 and AKT despite an early induction of the negative regulator of G-protein signalling, RGS1 by IFN-β1b. However, CXCR4 surface expression was reduced. Quantitative real time-PCR revealed a similar reduction in CXCR4-mRNA, and the requirement of several hours' exposure to IFN-β1b supports a transcriptional regulation. Interestingly, T cells from MS patients showed a lower CXCR4 expression than T cells from healthy controls, which was not reduced further in patients under IFN-β1b therapy. Furthermore, we observed no change in CXCL12-dependent chemotaxis in RRMS patients. Our results demonstrate clearly that IFN-β1b can impair the functional response to CXCR4 by down-regulating its expression, but also points to the complex in vivo effects of IFN-β1b therapy., (© 2015 British Society for Immunology.)
- Published
- 2015
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