Conditionally immortalized human podocytes were cultured as described previously36,37. Differentiated podocytes were serum-starved for 24 h and then pretreated with 100 nM ω-conotoxin (Peptide Institute, Osaka, Japan)38, 10 μM cilnidipine or 10 μM nitrendipine at 1 h before the stimulation of recombinant human TGF-β1 (R&D Systems, Minneapolis, MN). Cells were harvested after 24 h, and the expression level of nephrin was assayed by real-time RT-PCR analysis (n = 5–12).
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