Dimethyl Fumarate and Monoethyl Fumarate Exhibit Differential Effects on KEAP1, NRF2 Activation, and Glutathione Depletion In Vitro
Fig 2
DMF and MEF Differentially Modify KEAP1 Cysteine Residues.
KEAP1 transfected HEK 293FT cells were treated with DMF and MEF salts (Ca2+, Mg2+, Zn2+) at 3 μg/mL (A, C) or 6 μg/mL (B, D). Resulting cysteine modifications on KEAP1 were analyzed using mass spectrometry. Percent modification of KEAP1 cysteine residues with DMF or MEF was determined relative to DMSO control treated cells. (A, B) Representation of percent cysteine modification of analyzed KEAP1 cysteine residues in the presence of 3 (A) or 6 (B) μg/mL DMF or MEF. Each bar represents the means of quadruplicate determinations (± SD). (C, D) Box-whisker plots demonstrate the means, quartiles, and max-min of KEAP1 cysteine residues modified by greater than 10 percent in A and B. *, p<0.05. ***, p<0.001. ****, p<0.0001. P values are based on two-way analysis of variance (ANOVA) with Sidak’s post-test for multiple comparisons.