Preparation of Positive Control Platelets for Detection of Canine Platelet Surface-Associated IgG, IgM and Complement (C3) by Flow Cytometry

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An assay for the detection of platelet surface-associated (PSA-) IgG, IgM and/or complement (C3) in dogs was modified by the preparation of artificial positive control platelets. Flow cytometry of fluorescein isothiocyanate (FITC)-conjugated anti-dog IgG, anti-dog IgM and anti-dog C3 antibodies was used to detect the PSA-proteins. IgM single, IgM/C3 double and IgG/IgM/C3 triple positive platelets were prepared. FITC-conjugated anti-IgG antibody bound strongly only to the triple positive platelets. Binding of FITC-conjugated anti-IgM or anti-C3 antibody to the double and triple positive platelets was specifically blocked by preincubation with the respective non-FITC-conjugated same-origin antibodies. These results confirm that FITC-conjugated antibodies specifically detect PSA-proteins and that the control platelets prepared in this study are appropriate positive controls for the detection of PSA-proteins by flow cytometry.