DCA treatment inhibits MRP1 expression, thereby increasing the cytosolic accumulation of PENAO in GBM cells. (A) The expression of MRP1 in GBM cells (U87 and BAH1 cells) after 24 hr treatment with 20 mM DCA. Western blots presented are representative of 3 independent experiments. (B) Cellular levels of PENAO in U87 and BAH1 cells with/without 24 hr pre-treatment with 20 mM DCA. Results are presented as means ± s.d. of triplicate measurements. *p < 0.05.