Summary
The urethra and prostate of the guinea-pig contain at least two types of endocrine-like cells in the epithelium. The predominant type is argentaffin and stores 5-hydroxytryptamine. Treatment with reserpine or a dopa decarboxylase inhibitor markedly reduces the 5-hydroxytryptamine content of this cell type. The other less numerous cell type, which is argyrophil but not argentaffin, is devoid of 5-hydroxytryptamine but can be induced to store dopamine if supplied with dopa. Both cell types occur disseminated in the urethral epithelium, whilst only the argyrophyl, non-argentaffin cell type devoid of 5-hydroxytryptamine is found in the prostate. At the ultrastructural level the argentaffin cell type contains numerous electron-dense cytoplasmic 800–1000 Å granules. These granules are argentaffin, suggesting that they are the storage site for 5-hydroxytryptamine. The cells sometimes reach the urethral lumen via a narrow neck, the apex being endowed with microvilli. This arrangement suggests that the cells are capable of responding to stimuli in the urethral lumen. Preliminary attempts to test the effect of depriving or loading guinea-pigs with water failed to induced changes in the 5-hydroxytryptamine content of the urethral endocrine-like cells.
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Håkanson, R., Larsson, L.I., Sjöberg, N.O. et al. Amine-producing endocrine-like cells in the epithelium of urethra and prostate of the guinea-pig a chemical, fluorescence histochemical, and electron microscopic study. Histochemistry 38, 259–270 (1974). https://doi.org/10.1007/BF00493124
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DOI: https://doi.org/10.1007/BF00493124