The ATP flux was examined by luminometry, as previously described5 (link),16 (link). C2C12 cells stably expressing pEF1, pEF1/Panx3, or Ser68Ala were seeded at 1.0 × 104 cells/well in a 96-well plate, and cultured for 2 days in DMEM containing 10% FBS. The cells were then washed with PBS, followed by incubation in PBS for 2 min. The supernatant was collected and assayed with luciferase and luciferin (Promega). The luminescence was measured using a Mithras LB 940 multimode plate reader (Berthold).
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