Table 1.

Ratio of Intracellular Rhodamine-123 Concentration in the Presence and Absence of the pGP Inhibitor VPL (10 µM) in AT1 Cells Maintained under Acidic Conditions for Up to 24 Hours.

Time under Acidic Conditions (h)	n	Rhodamine-123 Concentration Ratio
0	12	1.72 ± 0.16
3	12	2.97 ± 0.28**
6	12	2.43 ± 0.26*
12	12	1.82 ± 0.15
24	12	1.81 ± 0.27

Values are expressed as mean ± SEM.

n, number of experiments.

^*P < .05 vs t = 0 hour.

^**P < .01 vs t = 0 hour.