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Rabbit and rat platelets have been extensively investigated under in vitro or in vivo conditions to try to understand the pathology of thrombosis in man. Here, surface-labelling techniques have been used to find out if the platelet surface has a similar composition in these two animals and in man or not. Human, rabbit and rat platelets were isolated, washed and surface-labelled by techniques specific for protein or for sugars (sialic acid or penultimate galactose/N-acetyl galactosamine residues). Labelled platelets were solubilized in sodium dodecyl sulphate and separated under reducing conditions on 7.5 % Laemmli polyacrylamide gels. Dried gels were exposed to film by fluorography or indirect autoradiography. Terminal Gal/Gal NAc residues (no neuraminidase treatment) were strongly labelled with rat and rabbit platelets compared to human platelets which labelled very poorly. Terminal sialic acid labelling with rat and rabbit platelets showed a weak labelling of a glycoprotein (GP) with the same M.Wt. as GPIb which is the most intensely labelled GP in man. However two GP (with rabbits) and one GP (in rats) were intensely labelled at a M.Wt. similar to that of GPIa in man. These GP had a different M.Wt. with terminal Gal/Gal NAc labelling. Bands with a similar M.Wt. to GPIIb and IIIa in man were strongly iodinated with rabbit platelets but with rat platelets only a single band at the position of GPIIb was strongly iodinated. These results strongly indicate that there are considerable differences in surface composition between rabbit, rat and human platelets.

Comparison Of The Major Membrane Glycoproteins Of Human, Rabbit And Rat Platelets