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In multiple sclerosis and in its animal model experimental autoimmune encephalomyelitis (EAE), inflammatory cells migrate across the endothelial blood-brain barrier and gain access to the CNS. The involvement of P-selectin glycoprotein ligand 1 (PSGL-1) and of its major endothelial ligand P-selectin in this process have been controversial. In this study we demonstrate that although encephalitogenic T cells express functional PSGL-1, which can bind to soluble and immobilize P-selectin if presented in high concentrations, PSGL-1 is not involved T cell interaction with P-selectin expressing brain endothelial cells in vitro. Furthermore, neither anti-PSGL-1 Abs nor the lack of PSGL-1 in PSGL-1-deficient mice inhibits the recruitment of inflammatory cells across the blood-brain barrier or the development of clinical EAE. Taken together, our findings demonstrate that PSGL-1 is not required for the pathogenesis of EAE.

P-Selectin Glycoprotein Ligand 1 Is Not Required for the Development of Experimental Autoimmune Encephalomyelitis in SJL and C57BL/6 Mice