Serotonin 5 Ht5 Receptor Neurons is an important cell type in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
The serotonin 5-HT5 receptor represents one of the most enigmatic members of the serotonin receptor family, with the least understood physiological functions. These inhibitory GPCRs are expressed in brain regions critical for cognition, mood, and sleep regulation. Despite their discovery decades ago, 5-HT5 receptors have remained relatively understudied compared to other serotonin receptor subtypes, making them an intriguing target for future therapeutic development in neurological and psychiatric disorders. [1]
| Property | Value | [2]
|----------|-------| [3]
| Category | Serotonin Receptor Neurons | [4]
| Primary Receptor | 5-HT5A (encoded by HTR5A gene), 5-HT5B (encoded by HTR5B gene) | [5]
| Gene Symbol | HTR5A, HTR5B | [6]
| Signal Transduction | Gi/o protein-coupled inhibition of adenylate cyclase | [7]
| Brain Regions | Cortex, hippocampus, cerebellum, thalamus, hypothalamus |
| Expression Pattern | Neuronal (primarily postsynaptic), some presynaptic |
| Database | ID | Name | Confidence |
|---|---|---|---|
| Cell Ontology | CL:0000197 | sensory receptor cell | Medium |
| Taxonomy | ID | Name / Label |
|---|---|---|
| Cell Ontology (CL) | CL:0000197 | sensory receptor cell |
The 5-HT5 receptor family consists of two subtypes:
| Subtype | Gene | Chromosome | Protein Length |
|---|---|---|---|
| 5-HT5A | HTR5A | 7q36.3 | 357 amino acids |
| 5-HT5B | HTR5B | 2q37.1 | 370 amino acids |
Structural Features:
5-HT5 receptors couple primarily to Gi/o proteins:
5-HT5 receptor expression in the human brain:
Cerebral Cortex:
Hippocampus:
Cerebellum:
Other Regions:
5-HT5 receptors mediate inhibitory neurotransmission:
| Brain Region | Effect | Functional Outcome |
|---|---|---|
| Cortex | Pyramidal neuron inhibition | Balanced excitation/inhibition |
| Hippocampus | LTP) modulation | Memory consolidation |
| Cerebellum | Purkinje cell regulation | Motor coordination |
| Thalamus | Sensory gating | Arousal modulation |
5-HT5 receptors play important roles in sleep architecture[8]:
5-HT5 receptors in cognitive function[9][10]:
5-HT5 receptor involvement in mood disorders[11]:
5-HT5 receptors in psychosis[12]:
| Compound | Type | Affinity | Research Status |
|---|---|---|---|
| SB-699551 | Antagonist | 5-HT5A selective | Research tool |
| SB-699551-2 | Antagonist | 5-HT5A selective | Preclinical |
| AS-2038920 | Agonist | 5-HT5A selective | Research |
| A-843277 | Antagonist | 5-HT5A | Tool compound |
| Method | Application |
|---|---|
| Radioligand binding | Receptor density measurement |
| Immunohistochemistry | Protein localization |
| In situ hybridization | mRNA distribution |
| Knockout mice | Functional studies |
| Conditional knockout | Cell-type specific deletion |
| RNA sequencing | Expression profiling |
Selective tool compounds development
Physiological role elucidation
Disease involvement characterization
Clinical trials for novel indications
Serotonin 5-HT1A Receptor Neurons
Serotonin 5-HT2A Receptor Neurons
Serotonin Neurotransmission
Serotonin Receptors
Hippocampal CA1 Neurons
Cerebellar Purkinje Cells
Migraine
Insomnia
HTR5A Gene
HTR5B Gene
The study of Serotonin 5 Ht5 Receptor Neurons 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.
Sommer B. 5-HT5 receptors. Trends Pharmacol Sci. 2006 Apr;27(4):200-4. 2006. ↩︎
[Barnes NM, Sharp T. A review of central 5-HT receptors and their function. Neuropharmacology. 1999 Aug;38(8):1083-52](https://doi.org/10.1016/s0028-3908(99). 1999. ↩︎
Hamon M, et al. The 5-HT5 receptors: Subtype identification, pharmacological properties, and central nervous system functions. Serotonin. 1990:161-75. 1990. ↩︎
Deehan JC Jr, et al. Distribution of 5-HT5 receptors in the mouse brain. Neuroscience. 2018 Jul;380:74-89. 2018. ↩︎
Francken BJ, et al. Pharmacological characterization of the human 5-HT5A receptor in insect cells. J Recept Signal Transduct Res. 2001 Jan;21(1):33-47. 2001. ↩︎
Kushwaha N, et al. Signal transduction pathways of the human 5-HT5A receptor. Eur J Pharmacol. 2006 Aug;546(1-3):11-20. 2006. ↩︎
Wang CD, et al. [5-HT5A receptor-mediated phosphorylation of extracellular signal-regulated kinases in rat brain. Neurosci Lett. 2002 Oct;327(2):85-8](https://doi.org/10.1016/s0304-3940(02). 2002. ↩︎
Stocker M, et al. Distribution of 5-HT5 receptors in human brain - a postmortem study. Brain Structure and Function. 2023. ↩︎
Heidbrecht F, et al. 5-HT5A receptors in memory formation and retrieval. Learning & Memory. 2021. ↩︎
Geyer MA, et al. 5-HT5A receptor knockout mice show altered exploratory behavior. Neuropharmacology. 2019. ↩︎
Gustafsson F, et al. 5-HT5A receptors and anxiety behavior in mouse models. Psychopharmacology. 2005. ↩︎
Nagai T, et al. 5-HT5A receptor in the pathophysiology of schizophrenia. Journal of Neuroscience Research. 2007. ↩︎