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Intracellular PSF-SOD1 protein is more stable than TAT-SOD1. (a, b) VERO and HK-2 cells were treated with 4 μM PSF-SOD1 or 4 μM TAT-SOD1 for 1 h, and then, the cultured medium was removed and replaced with fresh medium. Cells were harvested at the indicated time points to analyze SOD1 protein level by Western blot. ∗∗p < 0.01 and ∗∗∗p < 0.001 compared with TAT-SOD1-treated cells.
