PMID- 23011975 OWN - NLM STAT- MEDLINE DCOM- 20130408 LR - 20130116 IS - 1521-4141 (Electronic) IS - 0014-2980 (Linking) VI - 43 IP - 1 DP - 2013 Jan TI - Astrocytic Fas ligand expression is required to induce T-cell apoptosis and recovery from experimental autoimmune encephalomyelitis. PG - 115-24 LID - 10.1002/eji.201242679 [doi] AB - In T-cell-mediated autoimmune diseases of the CNS, apoptosis of Fas(+) T cells by FasL contributes to resolution of disease. However, the apoptosis-inducing cell population still remains to be identified. To address the role of astrocytic FasL in the regulation of T-cell apoptosis in experimental autoimmune encephalomyelitis, we immunized C57BL/6 glial fibrillary acid protein (GFAP)-Cre FasL(fl/fl) mice selectively lacking FasL in astrocytes with MOG(35-55) peptide. GFAP-Cre FasL(fl/fl) mice were unable to resolve EAE and suffered from persisting demyelination and paralysis, while FasL(fl/fl) control mice recovered. In contrast to FasL(fl/fl) mice, GFAP-Cre FasL(fl/fl) mice failed to induce apoptosis of Fas(+) activated CD4(+) T cells and to increase numbers of Foxp3(+) Treg cells beyond day 15 post immunization, the time point of maximal clinical disease in control mice. The persistence of activated and GM-CSF-producing CD4(+) T cells in GFAP-Cre FasL(fl/fl) mice also resulted in an increased IL-17, IFN-gamma, TNF, and GM-CSF mRNA expression in the CNS. In vitro, FasL(+) but not FasL(-) astrocytes induced caspase-3 expression and apoptosis of activated T cells. In conclusion, FasL expression of astrocytes plays an important role in the control and elimination of autoimmune T cells from the CNS, thereby determining recovery from EAE. CI - (c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. FAU - Wang, Xu AU - Wang X AD - Institute of Medical Microbiology, Otto-von-Guericke University Magdeburg, Magdeburg, Germany. FAU - Haroon, Fahad AU - Haroon F FAU - Karray, Saoussen AU - Karray S FAU - Martina Deckert AU - Martina Deckert FAU - Schluter, Dirk AU - Schluter D LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20121121 PL - Germany TA - Eur J Immunol JT - European journal of immunology JID - 1273201 RN - 0 (Cytokines) RN - 0 (Fas Ligand Protein) RN - 0 (Forkhead Transcription Factors) RN - 0 (Foxp3 protein, mouse) RN - 0 (Glial Fibrillary Acidic Protein) RN - 0 (Inflammation Mediators) RN - 0 (Myelin-Oligodendrocyte Glycoprotein) RN - 0 (Peptide Fragments) RN - 0 (myelin oligodendrocyte glycoprotein (35-55)) SB - IM MH - Animals MH - Apoptosis/genetics MH - Astrocytes/*immunology MH - CD4-Positive T-Lymphocytes/*immunology MH - Cells, Cultured MH - Cytokines/metabolism MH - Encephalomyelitis, Autoimmune, Experimental/genetics/*immunology MH - Fas Ligand Protein/genetics/*metabolism MH - Forkhead Transcription Factors/metabolism MH - Glial Fibrillary Acidic Protein/immunology MH - Humans MH - Inflammation Mediators/metabolism MH - Mice MH - Mice, Inbred C57BL MH - Mice, Knockout MH - Multiple Sclerosis/genetics/*immunology MH - Myelin-Oligodendrocyte Glycoprotein/immunology MH - Peptide Fragments/immunology MH - T-Lymphocytes, Regulatory/*immunology EDAT- 2012/09/27 06:00 MHDA- 2013/04/09 06:00 CRDT- 2012/09/27 06:00 PHST- 2012/05/14 00:00 [received] PHST- 2012/08/24 00:00 [revised] PHST- 2012/09/19 00:00 [accepted] PHST- 2012/09/27 06:00 [entrez] PHST- 2012/09/27 06:00 [pubmed] PHST- 2013/04/09 06:00 [medline] AID - 10.1002/eji.201242679 [doi] PST - ppublish SO - Eur J Immunol. 2013 Jan;43(1):115-24. doi: 10.1002/eji.201242679. Epub 2012 Nov 21.