Impairment of TNF-receptor-1 signaling but not fas signaling diminishes T-cell apoptosis in myelin oligodendrocyte glycoprotein peptide-induced chronic demyelinating autoimmune encephalomyelitis in mice.
T-cell apoptosis in inflammatory demyelinating lesions of chronic myelin oligodendrocyte glycoprotein peptide35-55 induced autoimmune encephalomyelitis was studied in several different gene knockout mice as well as their wild-type counterparts. The gene deletions included tumor necrosis factor (TNF) alpha, lymphotoxin, TNF receptor 1 or 2, Fas-L, inducible nitric oxide synthase, perforin, and interleukin1beta-converting enzyme. Impairment of the TNF receptor 1 pathway led to a 50% reduction of T-cell apoptosis in the central nervous system lesions, whereas the other genetic deletions showed no significant effect. Our study thus identified the TNF receptor 1 signaling pathway as one mechanism responsible for the removal of T lymphocytes from inflammatory demyelinating lesions of the central nervous system.
D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D053455:Caspase 10; D020169:Caspases / Q000378:metabolism; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000139:chemically induced / Q000503:physiopathology*; D053222:Fas Ligand Protein; D008562:Membrane Glycoproteins / Q000502:physiology; D051379:Mice; D018345:Mice, Knockout; D009185:Myelin Proteins; D018992:Myelin-Associated Glycoprotein / Q000737:chemistry / Q000633:toxicity*; D063308:Myelin-Oligodendrocyte Glycoprotein; D019001:Nitric Oxide Synthase / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II; D010446:Peptide Fragments / Q000633:toxicity*; D054353:Perforin; D052899:Pore Forming Cytotoxic Proteins; D018124:Receptors, Tumor Necrosis Factor / Q000502:physiology*; D015398:Signal Transduction / Q000502:physiology*; D013601:T-Lymphocytes / Q000473:pathology*; D019014:fas Receptor