A serotonin receptor subtype that is localized to the caudate nucleus; putamen; the nucleus accumbens; the hippocampus, and the raphe nuclei. It plays a role as a terminal autoreceptor that regulates the rate of serotonin release from nerve endings. This serotonin receptor subtype is closely related to and has similar drug binding properties as the 5-HT1B RECEPTOR, but is expressed at low levels. It is particularly sensitive to the agonist sumatriptan and may be involved in mediating the drug's antimigrane effect.


Symptoms and diagnosis

Symptoms:

    


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