Abstract
The electron-microscopic immunogold method was applied to Merkel cells of adult mice to demonstrate the subcellular localization of met-enkephalin-like immunoreactivity. Post-embedding incubation with metenkephalin antisera showed that the gold particles were associated with the dense-core granules of the Merkel cells. The majority, but not all, of the dense-core granules were strongly labelled. Osmication caused a significant reduction in the number of gold particles on these granules. The nerve terminal associated with the Merkel cell did not show met-enkephalin-like immunoreactivity. To the best of our knowledge, this is the first report of the ultrastructural localization of a positive met-enkephalin immunoreactivity in the dense-core granules of Merkel cells in mice.
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