Antigenic compartmentation in the mouse cerebellar cortex: Zebrin and HNK-1 reveal a complex, overlapping molecular topography


  • Leonard M. Eisenman PhD.,

    Corresponding author
    1. Department of Anatomy, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
    • Department of Anatomy, Jefferson Medical Collage, Thomas Jefferson University, Philadelphia, PA 19107
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  • Richard Hawkes

    1. Department of Anatomy and Neuroscience Research Group, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada
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Two monoclonal antibodies-anti-zebrin I and anti-HNK-1-have been used to study the compartmentation of the mouse cerebellar cortex. As in other species, the pattern of localization of the Purkinje cell specific antigen zebrin I is confined to a subset of Purkinje cells that are organized into parasagittal bands. The basic pattern consists of two abutting paramedian bands (P1+) and up to three additional vermal bands on either side (P2+[BOND]P4+) This patern is altered in the vermal regions of lobules X and VI-VII where all Purkinje cells are immunoreactive. In the hemisphere there are three additional bands present (P5+[BOND]P7+) plus two shorter bands in the paravermal area (P4b+ and P5a+) that extend from the paramedian lobule through the lobulus simplex. This pattern is very similar, but perhaps not identical, to that previously described for the rat. These results suggest a common mammalian plan for the expression and localization of zebrin I.

By using a monoclonal antibody to an epitope associated with HNK-1, we have now identified a novel pattern of compartmentation in mouse cerebellum. The HNK-1 epitope is expressed most notably on Purkinje cells and Golgi cells. The molecular layer immunoreactivity associated with the Purkinje cell dendrites varies in intensity in a systematic and reproducible fashion. This reveals a novel cerebellar compartmentation that is sometimes complementary, sometimes overlapping, to that revealed by anti-zebrin. As a result, it is now possible to subdivide the cerebellar cortex into a still finer mosaic of antigenic patches and bands than was possible by using zebrins alone.© 1993 Wiley-Liss, Inc.