Canine neutrophil adhesion proteins and Fc-receptors in healthy dogs and dogs with adhesion protein deficiency, as studied by flow cytometry.

Murine monoclonal anti-human antibodies directed against neutrophil adhesion protein receptors CD35, CD18, CD11b, CD11c and the Fc-receptors CD64 (Fc gamma RI), CD32 (FC gamma RII) and CD16 (Fc gamma RIII) were evaluated regarding their ability to bind to the canine homologues. The antibodies against CD35, CD18, CD11b, CD11c and CD16 could be used to evaluate the expression of canine homologues. The routine of using frozen cells and thereby avoiding methodological errors, when samples are stained at different times, was evaluated by comparison of receptor expression in frozen and fresh samples from the same dogs. All receptors were expressed consistently on the cell surface on frozen and fresh neutrophils with the exception of CD16, which showed decreased expression in frozen cells. The expression of CD11c on neutrophils from dogs with canine leucocyte adhesion deficiency (CLAD) was analyzed and there was no difference in receptor expression between CLAD-puppies and healthy controls. CD11b/CD18 expression on neutrophil samples from three parents of CLAD-puppies, i.e. heterozygotes, did not differ from receptor expression in normal controls. Analysis of the Fc-receptor expression on neutrophils from CLAD-puppies showed that the expression of CD16 tended to be decreased in patients compared with controls.