Abstract
Experimental autoimmune neuritis (EAN) is a well-known animal model of human demyelinating polyneuropathies. Here we have studied the spatiotemporal accumulation of interleukin (IL)-17(+) cells in sciatic nerves of EAN rats and effects of FTY720, an agonist of sphingosine-1-phosphate (S1P) receptors. In this study, we examined the spatiotemporal expression of IL-17 using immunohistochemistry and RT-PCR, and analysed the IL-17(+) cell proportion in blood and lymph nodes using flow cytometry. In sciatic nerves of EAN rats, IL-17(+) cells were mainly found to concentrate around blood vessels and IL-17(+) cell accumulation was temporally correlated with severity of neurological signs. FTY720, which has been shown to reduce severity of EAN, attenuated accumulation of IL-17(+) cells in sciatic nerves, decreased IL-17(+) cell proportion in peripheral blood, but increased IL-17(+) cell proportion in lymph nodes, suggesting the involvement of S1P signal pathway in regulating IL-17(+) cell trafficking. our data are consistent with the possibility that IL-17(+) cells might contribute to the pathogenesis of EAN and the S1P signal pathway may be involved in the in vivo trafficking of IL-17(+) cells.
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