Western blotting was performed by modifying a previously described procedure [26 (link)]. Briefly, platelets were lysed in buffer A and B and centrifuged at 20,000× g for 30 min, and the supernatant was collected to obtain the cell membrane lysate. Then, proteins were separated using sodium dodecyl sulfate polyacrylamide gel electrophoresis and reacted with anti-PKC-α antibody (1:500, Santa Cruz), anti-PKC-βI (1:500, Santa Cruz), anti-PKC-βII (1:500, Santa Cruz), anti-PKC-γ (1:500, Santa Cruz), anti-PKC-δ (1:500, Santa Cruz), or anti-actin (1:3000, Cell Signaling) overnight. All samples were analyzed using a LAS 4000 mini (Fuji Photo Film, Tokyo, Japan). This experiment was repeated a total of three times.
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