Serotoniinireseptori eli 5-HT-reseptori on monien eliölajien, muun muassa ihmisen reseptori, johon muun muassa välittäjäaineserotoniini voi kiinnittyä luonnollisena ligandina. Reseptoreita on seitsemää tyyppiä, 5-HT1–7, jotka jakautuvat edelleen lukuisiin alatyyppeihin. Niitä on sekä keskus- että ääreishermostossa. Osa reseptoreista toimii kiihdyttävinä ja osa vaimentavina eli hermosolun toimintaa estävinä.[1][2]
5-HT1C -nimistä reseptoria ei ole, koska sellaiseksi alun perin nimetty serotoniinireseptori kloonattiin ja sitä tutkittiin tarkemmin, jolloin sillä havaittiin olevan enemmän yhteistä 5-HT2 -tyypin reseptorien kanssa ja sen uudeksi nimeksi vakiintui 5-HT2C. 5-HT5B-reseptori on ainoastaan hiirillä ja rotilla, eikä lainkaan ihmisillä tai apinoilla.
Erittäin epäselektiivisiä serotoniiniagonisteja ovat muun maussa ergotamiini (migreenilääke), joka aktivoi 5-HT1A-, 5-HT1D-, 5-HT1B-, D2- ja noradrenaliinireseptoreita.[30] LSD (psykedeeli) on 5-HT1A-, 5-HT2A-, 5-HT2C-, 5-HT5A-, 5-HT5- ja 5-HT6-reseptoreiden agonisti.[30]
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