(a) Western analysis of MRP1 and Na/K-ATPaseα1 protein expression in plasma membranes from HEKpUSE, HEKMRP1, HEKR433S, and HEKG671V cells. (b) ATP-dependent transport of 100 nM [3H]LTC4 in plasma membrane vesicles from HEKMRP1, HEKR433S, and HEKG671V cells in the absence (closed bars) or presence (open bars) of 5 or 0.5 mM GSH. (c) ATP-dependent transport of [3H]GS-HNE (0 – 6 μM) in plasma membrane vesicles from HEKMRP1, HEKR433S, HEKG671V and HEKpUSE cells. Kinetic parameters for ATP-dependent [3H]GS-HNE transport calculated from transport studies. Data represent mean ± SE from triplicate determinations (n = 3 per group). *** P < 0.001. All data were normalized for expression of MRP1.