Summary
A specific formaldehyde-induced yellow fluorescence, suggesting the presence of serotonin-like monoamine has been demonstrated in the gustatory cells of the frog.
The fungiform papillae of frogs were examined fluorescence-histochemically after intraperitoneal injection of 5,6-dihydroxytryptamine. The results indicated that the fluorophore of gustatory cells was affected selectively by the drug injection: the yellow fluorescence was transiently enhanced 3 hours after the drug injection, thereafter being reduced rapidly. The effect of 5,6-dihydroxytryptamine was long-lasting with the reduction of the yellow fluorophore persisting at least for the experimental duration of 14 days. A single injection of 6-hydroxydopamine induced a complete depletion of noradrenaline fluorescence from adrenergic nerve terminals, while the fluorescence of gustatory cells was not affected by a high dose of the drug.
The present results with pharmacologic treatments further support the view that the gustatory cell of the frog contains a serotonin-like monoamine.
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Nada, O., Hirata, K. Specific effect of 5,6-dihydroxytryptamine on the monoamine fluorophore of the frog's gustatory cells. Histochemistry 45, 121–127 (1975). https://doi.org/10.1007/BF00495156
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DOI: https://doi.org/10.1007/BF00495156