Pathway candidateNCBI-verifiedprotein-coding

HTR2B

5-hydroxytryptamine receptor 2B

NCBI Gene: 3357 Ensembl GeneCards UniProt: P41595

Pathway candidate — not linked to PFS or PSSD by any record here

HTR2B is in the library because it belongs to the neurotransmission family. No study, report or commentary in the corpus names it, so a variant in HTR2B is not, by itself, evidence of anything related to post-drug syndromes.

Gene summary

A protein-coding gene on chromosome 2 (neurotransmission). Encodes one of the several different receptors for 5-hydroxytryptamine (serotonin) that belongs to the G-protein coupled receptor 1 family. Serotonin is a biogenic hormone that functions as a neurotransmitter, a hormone, and a mitogen.

Source: NCBI Gene, accessed 2026-10-07.

Protein reference (UniProt)

Protein: 5-hydroxytryptamine receptor 2B
Function (excerpt): G protein-coupled receptor for 5-hydroxytryptamine (serotonin). Also functions as a receptor for various ergot alkaloid derivatives and psychoactive substances. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of downstream effectors. HTR2B is coupled to G(q)/G(11) G alpha proteins and activates phospholipase C-beta, releasing diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) second messengers that modulate the activity of phosphatidylinositol 3-kinase and promote the release of Ca(2+) ions from intracellular stores, respectively. Beta-arrestin family members inhibit signaling via G proteins and mediate activation of alternative signaling pathways. Plays a role in the regulation of dopamine and 5-hydroxytryptamine release, 5-hydroxytryptamine uptake and in the regulation of extracellular dopamine and 5-hydroxytryptamine levels, and thereby affects neural activity.
Subcellular location: Cell membrane; Synapse, synaptosome.
Tissue specificity: Ubiquitous. Detected in liver, kidney, heart, pulmonary artery, and intestine. Detected at lower levels in blood, placenta and brain, especially in cerebellum, occipital cortex and frontal cortex.

Source: UniProtKB/Swiss-Prot P41595, release 2026_03, licensed CC BY 4.0. This is the protein’s normal biology, not evidence about post-drug syndromes; associated conditions are inherited disorders of the gene, not PFS, PSSD or PRSD.

Why its pathway is in the library

Monoamine, GABA, glutamate, and cholinergic systems are the direct pharmacologic targets of SSRIs/SNRIs (PSSD) and the downstream effectors of neurosteroid signaling (PFS).

Written for the whole neurotransmission family, not for HTR2B specifically.

Mentioned in 0 corpus records

No corpus record names HTR2B directly yet. It is in the library because it sits in a pathway the corpus tracks (Neurotransmission).

Also in neurotransmission

All 54 genes

Browse by family on the gene families page.

Gene summary

Source: NCBI Gene, accessed 2026-10-07.

Protein reference (UniProt)

Protein: 5-hydroxytryptamine receptor 2B
Function (excerpt): G protein-coupled receptor for 5-hydroxytryptamine (serotonin). Also functions as a receptor for various ergot alkaloid derivatives and psychoactive substances. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of downstream effectors. HTR2B is coupled to G(q)/G(11) G alpha proteins and activates phospholipase C-beta, releasing diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) second messengers that modulate the activity of phosphatidylinositol 3-kinase and promote the release of Ca(2+) ions from intracellular stores, respectively. Beta-arrestin family members inhibit signaling via G proteins and mediate activation of alternative signaling pathways. Plays a role in the regulation of dopamine and 5-hydroxytryptamine release, 5-hydroxytryptamine uptake and in the regulation of extracellular dopamine and 5-hydroxytryptamine levels, and thereby affects neural activity.
Subcellular location: Cell membrane; Synapse, synaptosome.
Tissue specificity: Ubiquitous. Detected in liver, kidney, heart, pulmonary artery, and intestine. Detected at lower levels in blood, placenta and brain, especially in cerebellum, occipital cortex and frontal cortex.