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Retrograde axonal transport of antibodies against synaptic membrane glycoproteins was studied in the hypoglossal nerve and several CNS pathways of the rat. Injection into the tongue of polyclonal antibodies against synaptic membrane glycoproteins produced immunocytochemically labeled cells in the hypoglossal nucleus 4-5 hr later. Immunoreactive staining increased through 48 hr after injection and then declined. Injections of Fab preparations of the antibody gave labeling patterns indistinguishable from those of the whole antibody. The specificity of this method is shown by control studies in which antibodies against antigens that are not known to be present on the surface of presynaptic membranes were injected and gave no retrograde labeling. Retrograde labeling was also demonstrated in CNS pathways. However, labeling was never as intense as that seen in the hypoglossal nucleus, and some CNS pathways failed to show any retrograde labeling. Furthermore, retrograde labeling after control injections could be demonstrated in some cases. To determine if antibodies were also transported anterogradely, injections were made into the vitreous body of the eye, and the superior colliculus was processed for immunocytochemistry. Unlike wheat-germ agglutinin and several other tracers, antibodies were not found to be anterogradely transported in the optic nerve.

Characterization of retrograde axonal transport of antibodies in central and peripheral neurons.