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  • Title: The actions of serotonin on frog primary afferent terminals and cell bodies.
    Author: Holz GG, Anderson EG.
    Journal: Comp Biochem Physiol C Comp Pharmacol Toxicol; 1984; 77(1):13-21. PubMed ID: 6141866.
    Abstract:
    The actions of serotonin (5-HT) were studied in the isolated frog spinal cord and dorsal root ganglion preparations. In the spinal cord, 5-HT increased the spontaneous activity recorded from dorsal roots, facilitated evoked spinal reflexes and produced fast and slow primary afferent depolarization (PAD). A direct action of 5-HT on primary afferent terminals is likely since 5-HT induced PAD remained in the presence of 1 microM tetrodotoxin and 2 mM Mn2+. The direct action of 5-HT on primary afferent terminals was blocked by methysergide and attenuated by concentrations of Mn2+ in excess of that required to block transmitter release. Cell bodies of the dorsal root ganglion were also depolarized by 5-HT. A slow hyperpolarization occasionally followed the initial depolarization. The depolarizing action of 5-HT in the dorsal root ganglion was also attenuated by treatment with Mn2+. It is concluded that 5-HT acts directly on frog primary afferents and that this influence may involve a calcium sensitive process. The dorsal root ganglion response to 5-HT appears to be a suitable model of the afferent terminal response.
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