IL-17 has been researched quite a bit over the last couple of years at least. Here is some interesting evidence of its involvment in MS.
Interleukin-17 Production in Central Nervous System-Infiltrating T Cells and Glial Cells Is Associated with Active Disease in Multiple Sclerosis.
Am J Pathol. 2007 Dec 21
Tzartos JS, Friese MA, Craner MJ, Palace J, Newcombe J, Esiri MM, Fugger L.
From the Departments of Neuropathology* and Clinical Neurology, John Radcliffe Hospital, ...