DMF affects T cells subset

Gross CC, Schulte-Mecklenbeck A, Klinsing S, Posevitz-Fejfár A, Wiendl H, Klotz L. Dimethyl fumarate treatment alters circulating T helper cell subsets in multiple sclerosis.Neurol Neuroimmunol Neuroinflamm. 2015 Dec 10;3(1):e183. eCollection 2016 Feb

OBJECTIVE:To evaluate the effect of dimethyl fumarate (DMF; Tecfidera, Biogen, Weston, MA) on CD4+ and CD8+ T cell subsets in patients with multiple sclerosis (MS).
METHODS:Peripheral lymphocyte subsets, including CD4+ and CD8+ memory cells and T helper (TH) cells TH1, TH2, TH17, and peripheral regulatory T cell (pTreg) subpopulations were analyzed before and 6 months after onset of DMF treatment.
RESULTS:CD4+ and CD8+ memory T cells were preferentially decreased compared to naive CD4+ and CD8+ T cell populations. Within the CD4+memory T cell population, frequencies of TH1 cells were decreased, whereas those of TH2 cells were increased and those of TH17 cells remained unaltered. Accordingly, we observed decreased production of interferon γ, granulocyte-macrophage colony-stimulating factor, tumor necrosis factor α, and interleukin (IL)-22 by CD4+ T cells under DMF treatment, whereas the frequency of IL-4- and IL-17A-producing CD4+ T cells remained unchanged. With regard to regulatory T cells, proportions of pTreg increased following DMF treatment.
CONCLUSION:Our data demonstrate that DMF treatment of patients with MS affects predominantly memory T cells accompanied by a shift in THcell populations, resulting in a shift toward anti-inflammatory responses. These findings indicate that monitoring of memory subsets might enhance vigilance of impaired anti-viral immunity and that patients with TH1-driven disease might preferentially benefit from DMF treatment.

So this suggests that simply looking at a T cell subsets may be missing a trick when it comes to the risk of PML .

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