Abstract
Human leptomeningeal (arachnoid and pia mater) cells in culture have been demonstrated in replicated studies to express typical neuronal proteins such as neurofilament protein and neuron-specific enolase. In addition, they can express glial fibrillary acidic protein. The present study examines the possibility that neuronal and glial proteins might be present in rat and human leptomeningeal cells in situ. The neuronal proteins 160 kDa and 200 kDa neurofilaments, neuron-specific enolase and microtubule-associated protein 2 were, however, not immunolocalized in either the pia mater or arachnoid. Glial fibrillary acidic protein and galactocerebroside were also not detected, while fibronectin and vimentin immunoreactivities were robust in all layers of the leptomeninges. Together with the previously reported expression of some neuronal and astroglial markers in cultured human leptomeninges, these observations suggest that culture alters the properties of leptomeningeal cells.
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