Summary
The tracheo-bronchial mucosa of the mouse has been found to contain an extensive system of argyrophilic epithelial cells. In the trachea the cells morphologically resemble enterochromaffin cells. Normally, these enterochromaffin-like cells contain no fluorogenic amine, as revealed by the Falck-Hillarp formaldehyde technique. On the other hand the cells have the capacity to take up and decarboxylate 3,4-dihydroxyphenylalanine (DOPA) or 5-hydroxytryptophan (5-HTP); the amine formed is stored in the cytoplasm in a reserpine-sensitive store. This capacity to produce and store amines under experimental conditions may reflect the presence in the tracheal enterochromaffin-like cells of an amine which can not be demonstrated with available fluorescence histochemical techniques. In the electron microscope the tracheal enterochromaffin-like cells were identified by a positive argyrophil reaction and by their capacity to accumulate radioactivity after administration of 3H-DOPA or 3H-5-HTP as revealed by autoradiography. The radioactive labelling was associated with cytoplasmic electron-dense granules (800–1000 Å), suggesting that the amine formed was stored in these granules. Accordingly, the granules stained argentaffin after DOPA-pre-treatment of the animal. It is suggested that, like similar cells in the gastric mucosa, these argyrophilic enterochromaffin-like cells constitute an endocrine system in which amines are of cytophysiological importance.
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Ericson, L.E., Håkanson, R., Larson, B. et al. Fluorescence and electron microscopy of amine-storing enterochromaffin-like cells in tracheal epithelium of mouse. Z. Zellforsch. 124, 532–545 (1972). https://doi.org/10.1007/BF00335256
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DOI: https://doi.org/10.1007/BF00335256