Proteins were analyzed by SDS-PAGE using the NuPAGE system (ThermoFisher Scientific). Separated proteins were either identified by mass-spectrometric analysis or electrotransferred onto a nitrocellulose membrane by tank blotting with transfer buffer (ThermoFisher Scientific) according to the manufacturer’s instructions. The membranes were blocked with Universal Blot Buffer plus (Euroimmun) for 15 min and incubated with human serum or the polyclonal antibody against ITPR1 in Universal Blot Buffer plus for 3 h, followed by three washing steps with Universal Blot Buffer (Euroimmun), a second incubation for 30 min with anti-rabbit IgG-AP (Sigma-Aldrich), three washing steps, and staining with NBT/BCIP substrate (Euroimmun).
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