Table 1. Uptake of M3G by ABCC1 in the Presence of the Nonhydrolyzable ATP Analog AMPPNP, Glibenclamide, Probenecid, and Vanadate on Ice (0°C).

Conditions	M3G Uptake (% Control)
ATP	100
AMPPNP (4 mM)	nd
Glibenclamide (150 µM)	1.3 ± 2.74**
Probenecid (1 mM)	4 ± 4.89**
Vanadate (1 mM)	nd
0°C	nd

With the exception of the 0°C condition, transport experiments were performed at room temperature. Results represent the means ± se of three independent uptake experiments from three independent microsome preparations. nd, not detectable. Asterisks indicate significance differences between conditions (Student’s t test; P < 0.01).