Serotonin 5-hydroxytryptamine 1E receptor (5-HT1E receptor)

The **Serotonin 5-hydroxytryptamine 1E receptor (5-HT1E receptor)** is a member of the serotonin 5-HT1 receptor subfamily, which includes 5-HT1A, 5-HT1B, 5-HT1D, 5-HT1E, and 5-HT1F types[2][6]. It is a **G protein-coupled receptor** (GPCR) that predominantly couples to **Gi/o proteins**, leading to inhibitory signaling in neurons[2][5]. The receptor is mainly expressed in the hippocampus and hypothalamus, as well as some immune cell types, suggesting roles in both neurological and inflammatory processes[3][6]. Structural studies—including high-resolution cryo-EM—have revealed details of ligand binding and receptor activation, notably the interaction with the selective agonist **BRL-54443**[1][2][5][7]. Other pharmacologically relevant agonists include the tetracyclic antidepressants **mianserin**, **setiptiline**, and **mirtazapine**, which can also activate 5-HT1E and 5-HT1F receptors[7]. Despite its potential therapeutic relevance—especially as a target in migraines—much about the physiological role of the 5-HT1E receptor remains unknown; unlike other serotonin receptors, its function in native tissues is less well established[7]. This uncertainty contributes to safety concerns regarding drug development and clinical targeting. Overall, the 5-HT1E receptor represents a structurally and pharmacologically distinct serotonin receptor subtype with promising but incompletely understood therapeutic potential[7][8].

Other names

5-HT1E receptorSerotonin receptor 1EHTR1E

Agonism: Drug binding to the receptor activates Gi/o protein signaling, leading to inhibition of adenylyl cyclase, decreased cAMP, and subsequent downstream effects Selectivity: Ligand selectivity is determined by specific residues in the binding pocket, especially E311^6.55, which interacts with agonists such as BRL-54443