Htr4 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
The HTR4 gene encodes the 5-hydroxytryptamine receptor 4 (5-HT4), a G-protein coupled receptor that mediates the effects of serotonin in the central nervous system and peripheral tissues. The 5-HT4 receptor plays important roles in learning, memory, mood regulation, and gastrointestinal motility.
Key points:
5-Hydroxytryptamine Receptor 4
| Symbol | HTR4 |
| Full Name | 5-Hydroxytryptamine Receptor 4 |
| Chromosome | 5q31-q33 |
| NCBI Gene ID | 3365 |
| OMIM | 604354 |
| Ensembl | ENSG00000176049 |
| UniProt | Q9Y4XE8 |
| Associated Diseases | Alzheimer's Disease, Parkinson's Disease, Schizophrenia, Depression, Irritable Bowel Syndrome |
The HTR4 gene (5-Hydroxytryptamine Receptor 4) encodes a serotonin receptor that positively modulates adenylate cyclase activity through Gs protein coupling. This receptor is widely expressed in the brain, particularly in areas associated with memory, learning, and mood regulation. HTR4 has been implicated in Alzheimer's disease, Parkinson's disease, and various psychiatric disorders. The receptor is a promising target for cognitive enhancement and treatment of mood disorders associated with neurodegeneration.
The HTR4 gene encodes the 5-hydroxytryptamine receptor 4 (5-HT4), a G-protein coupled receptor that activates Gs proteins, stimulating adenylyl cyclase and increasing cAMP production. This receptor is widely expressed in the brain and peripheral tissues, where it plays important roles in learning, memory, mood, and gastrointestinal motility.
5-HT4 receptor activation triggers:
The receptor desensitizes rapidly upon prolonged agonist exposure through phosphorylation and beta-arrestin recruitment.
5-HT4 receptors are highly expressed in brain regions important for learning and memory, including the hippocampus and cortex. In AD, 5-HT4 receptor density is reduced, contributing to cognitive deficits. 5-HT4 agonists have shown promise in improving memory in animal models by enhancing synaptic plasticity and counteracting Aβ-induced cognitive impairment.
5-HT4 receptors modulate dopamine release in the striatum. Agonists may provide symptomatic benefits and potential neuroprotection. The receptor is also implicated in levodopa-induced dyskinesias.
Altered 5-HT4 receptor signaling may contribute to cognitive deficits in schizophrenia. Some atypical antipsychotics have 5-HT4 antagonist properties.
5-HT4 agonists have rapid antidepressant-like effects in animal models, potentially through increased hippocampal neurogenesis and BDNF expression.
In the gut, 5-HT4 receptors stimulate peristalsis. 5-HT4 agonists (tegaserod, prucalopride) are used to treat irritable bowel syndrome with constipation (IBS-C) and chronic constipation.
5-HT4 receptors are expressed in:
| Region | Expression | Function |
|---|---|---|
| Hippocampus | High | Learning, memory, synaptic plasticity |
| Cortex | High | Cognition, perception |
| Striatum | Moderate | Motor control, reward |
| Amygdala | Moderate | Emotion processing |
| Hypothalamus | Moderate | Homeostatic functions |
[1] Bockaert J, et al. (2004). 5-HT4 receptors: from molecular biology to clinical therapeutics. Curr Opin Pharmacol. PMID:15051168.
[2] Lucas G, et al. (2010). 5-HT4 receptor agonists as fast-acting antidepressants. Neuropsychopharmacology. PMID:20668453.
[3] Maillet M, et al. (2015). 5-HT4 receptors and hippocampal synaptic plasticity. Learn Mem. PMID:25609712.
The study of Htr4 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
[1] Bockaert J, et al. 5-HT4 receptors: from molecular biology to clinical therapeutics. Curr Opin Pharmacol. 2004;4(1):37-42. PMID:15051168.
[2] Lucas G, et al. 5-HT4 receptor agonists as fast-acting antidepressants: a new pharmacological strategy. Neuropsychopharmacology. 2010;35(1):235-236. PMID:20668453.
[3] Maillet M, et al. 5-HT4 receptors and hippocampal synaptic plasticity. Learn Mem. 2015;22(10):471-477. PMID:25609712.