RPTC were treated with 50 μm cisplatin and loaded with 10 μm JC-1 for 30 min at 37 °C, washed twice with ice-cold PBS, and overlaid with ice-cold PBS. The live RPTC monolayers were examined under Zeiss fluorescent microscope (Axioskop) using water-immersion objective. Original magnification, ×400. A, controls. B, RPTC treated with 50 μm cisplatin for 18 h. C, RPTC treated with 50 μm cisplatin for 24 h. Inset, a single cell (original magnification, ×800). D, mitochondrial depolarization in RPTC induced by FCCP (2 μm). These images are representative of three independent experiments (cell isolations).