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Resting and activated subpopulations of CD4 + CD25 + CD127 lo T regulatory cells (Treg) and CD4 + CD25 + CD127 +  effector T cells in MS patients and in healthy individuals were compared. Peripheral blood mononuclear cells isolated using Ficoll Hypaque were stained with monoclonal antibodies and analysed by flow cytometer. CD45RA and Foxp3 expression within CD4 +  cells and in CD4 + CD25 + CD127 lo T cells identified Population I; CD45RA + Foxp3 + , Population II; CD45RA − Foxp3 hi  and Population III; CD45RA − Foxp3 +  cells. Effector CD4 + CD127 +  T cells were subdivided into Population IV; memory /effector CD45RA −  CD25 − Foxp3 −  and Population V; effector naïve CD45RA + CD25 − Foxp3 − CCR7 +  and terminally differentiated RA +  (TEMRA) effector memory cells. Chemokine receptor staining identified CXCR3 + Th1-like Treg, CCR6 + Th17-like Treg and CCR7 +  resting Treg. Resting Treg (Population I) were reduced in MS patients, both in untreated and treated MS compared to healthy donors. Activated/memory Treg (Population II) were significantly increased in MS patients compared to healthy donors. Activated effector CD4 +  (Population IV) were increased and the naïve/ TEMRA CD4 +  (Population V) were decreased in MS compared to HD. Expression of CCR7 was mainly in Population I, whereas expression of CCR6 and CXCR3 was greatest in Populations II and intermediate in Population III. In MS, CCR6 + Treg were lower in Population III. This study found MS is associated with significant shifts in CD4 + T cells subpopulations. MS patients had lower resting CD4 + CD25 + CD45RA + CCR7 +  Treg than healthy donors while activated CD4 + CD25 hi CD45RA − Foxp3 hi Treg were increased in MS patients even before treatment. Some MS patients had reduced CCR6 + Th17-like Treg, which may contribute to the activity of MS.

Multiple sclerosis patients have reduced resting and increased activated CD4+CD25+FOXP3+T regulatory cells