Podocyte apoptosis was measured by flow cytometry using an annexin V-FITC apoptosis detection kit (Becton Dickinson, San Diego, CA, USA). Briefly, podocytes were collected and suspended in 500 µl binding buffer, followed by staining with annexin V-FITC and propidium iodide (PI) at room temperature for 5 min in the dark. After removing the unbound annexin V-FITC and PI by centrifugation, the cells were resuspended in excess binding buffer. For each measurement, at least 10,000 cells were analyzed by FACS flow cytometer (Becton Dickinson, San Diego, CA, USA).
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