Association between axonal damage and molecular basis in demyelinating neuropathies: prognosis and response to treatment

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The association between axon-myelin interaction and functional several molecules which are distributed from node of Ranvie to juxtaparanode is well recognized. In this study, we analyzed immunohistochemically the distribution and expression of those molecules, including sodium channel, TAG-1, CNTN1, Caspr and Caspr2, using by teased-fiber preparation in patients with demyelinating neuropathies. The expression of sodium channel in demyelinating neuropathies showed markedly decrease compared with normal control although no morphological changes are observed in light microscopic study. In addition, we confirmed that homologous TAG-1 knockout mice resulted in significant ateliosis. These results may suggest that several molecules which is associated with axon-myelin interaction, including TAG-1, express their function in the development phase and play an important role in repair after demyelination.