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Immunohistochemical Study of Netrin-1 in the Spinal Cord with Rat Experimental Autoimmune Encephalomyelitis

To investigate whether netrin-1 is involved in autoimmune injury of the central nervous system, the expression of netrin-1 protein was analyzed in the spinal cord of Lewis rats with experimental autoimmune encephalomyelitis (EAE). Western blot analysis revealed significantly increased content of netrin-1 in the spinal cords of rats at the peak stage of EAE, as compared with the levels in normal control animals (p < 0.01). Immunohistochemistry detected the netrin-1 protein in neurons, oligodendrocytes, astrocytes and vascular endothelial cells in the spinal cords of normal controls. In EAE-affected spinal cords, netrin-1 immunoreactivity was detected in infiltrating inflammatory cells at the peak stage as well as in neurons, oligodendrocytes and astrocytes. These results suggest that netrin-1 is transiently increased in rat EAE lesions, where it contributes to the modulation of rat acute EAE.