Confluent hPT cells grown on collagen-coated, T-25 flasks were incubated up to 48 hr with PBS (= Control, Con), the indicated concentrations of DCVC, or 1 μM staurosporine (Sts). At the indicated times, cells were released from flasks by brief treatment with trypsin/EDTA, resuspended in PBS at a cell concentration of 2 × 106/ml, and were added to the Oxygraph electrode chamber for measurement of succinate-stimulated O2 consumption. Results are means ± SEM of measurements from 4 separate cell cultures, each deriving from a different kidney, except for incubation with Sts, which were averages of measurements from 2 separate cell cultures. *Significantly different (P < 0.05) from corresponding control values.