5-hydroxytryptamine receptor 1E (5-HT₁E receptor (gene symbol: HTR1E))

5-hydroxytryptamine receptor 1E is a human G protein-coupled receptor (GPCR) subtype for serotonin (5-HT), encoded by the **HTR1E** gene. It is predominantly expressed in the human and guinea pig brains, especially in the hippocampus, frontal cortex, and olfactory bulb. Functionally, 5-HT₁E couples to Gi proteins, inhibiting adenylate cyclase activity and reducing intracellular cAMP. Its physiological role is hypothesized to involve memory regulation given its expression in brain regions linked to memory processing, but its function is not definitively characterized due to the absence of selective pharmacological tools, specific antibodies, and suitable animal models (no gene in mouse/rat). 5-HT₁E shares structural and pharmacological similarities with the 5-HT₁F receptor but the two differ in brain expression and likely physiological roles. BRL-54443 is a known agonist, albeit with mixed receptor selectivity. There are currently no highly selective drugs, disease biomarkers, or established safety concerns related to 5-HT₁E targeting, making it an understudied but potentially important therapeutic target in neuropsychiatry and neurodegeneration.

Other names

5-HT₁E receptorSerotonin 1E receptorHTR1E (gene symbol)

Drugs targeting 5-HT₁E receptor will typically act as **agonists** to stimulate the receptor and inhibit adenylate cyclase (lowering cAMP signaling) No specific antagonists available Mixed selectivity with other serotonin receptors may influence off-target effects