Alterations in circulating T cell functional subpopulations in interferon-beta treated multiple sclerosis patients: A pilot study.

Our work consists of a pilot study to characterize circulating Th/c1, Th/c2, Th/c17, Treg and Tfh-like populations and IL-17 serum levels of relapsing-remitting (RR) MS patients treated with IFN-β, compared with healthy controls. In remission RRMS patients, we observe increased Th/c17 cells frequency committed to a Th1 profile and increased soluble IL-17 levels. Moreover, a shift toward Th/c2 with reduction of Tc1 cells and decrease in effector/terminal differentiated compartment of Th1 cells were also observed. Despite RRMS patients being an inactive disease phase, IL-17 and Th/c17 cells seemed to contribute to perpetuating chronic inflammation, besides the altered ratio Th1/Th2.