Experimental autoimmune encephalomyelitis (EAE) models, in animals, many characteristics of multiple sclerosis, for which there is no adequate therapy. We investigated whether lithium, an inhibitor of glycogen synthase kinase-3 (GSK3), can ameliorate EAE in mice. Pretreatment with lithium markedly suppressed the clinical symptoms of EAE induced in mice by myelin oligodendrocyte glycoprotein peptide (MOG(35-55)) immunization and greatly reduced demyelination, microglia activation, and leukocyte infiltration in the spinal cord. Lithium administered postimmunization, after disease onset, reduced disease severity and facilitated partial recovery. Conversely, in knock-in mice expressing constitutively active GSK3, EAE developed more rapidly and was more severe. In vivo lithium therapy suppressed MOG(35-55)-reactive effector T cell differentiation, greatly reducing in vitro MOG(35-55). stimulated proliferation of mononuclear cells from draining lymph nodes and spleens, and MOG(35-55) induced IFN-gamma, IL-6, and IL-17 production by splenocytes isolated from MOG(35-55) immunized mice. In relapsing/remitting EAE induced with proteolipid protein peptide(139-151) lithium administered after the first clinical episode maintained long-term (90 days after immunization) protection, and after lithium withdrawal the disease rapidly relapsed. These results demonstrate that lithium suppresses EAE and identify GSK3 as a new target for inhibition that may be useful for therapeutic intervention of multiple sclerosis and other autoimmune and inflammatory diseases afflicting the CNS.
|Number of pages||8|
|Journal||Journal of Immunology|
|Publication status||Published - 1 Jul 2008|