GluK2 Kainate Receptor Neurons
Introduction
<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">GluK2 Kainate Receptor Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000197](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000197)</td>
</tr>
<tr>
<td class="label">Receptor Type</td>
<td>GluK2 (GRIK2, KAR2)</td>
</tr>
<tr>
<td class="label">Family</td>
<td>Ionotropic glutamate (kainate receptor)</td>
</tr>
<tr>
<td class="label">Signaling Mechanism</td>
<td>Ligand-gated ion channel, Ca2+ permeable (unedited)</td>
</tr>
<tr>
<td class="label">Primary Location</td>
<td>Hippocampus, cortex, amygdala</td>
</tr>
<tr>
<td class="label">Structure</td>
<td>Homomeric or heteromeric with GluK3/GluK5</td>
</tr>
<tr>
<td class="label">Calcium Permeability</td>
<td>High (Q/R unedited)</td>
</tr>
<tr>
<td class="label">Receptor Type</td>
<td>Composition</td>
</tr>
<tr>
<td class="label">GluK2 homomer</td>
<td>GluK2 × 4</td>
</tr>
<tr>
<td class="label">GluK2/K3</td>
<td>GluK2 + GluK3</td>
</tr>
<tr>
<td class="label">GluK2/K5</td>
<td>GluK2 + GluK5</td>
</tr>
<tr>
<td class="label">Region</td>
<td>GluK2 Expression</td>
</tr>
<tr>
<td class="label">Hippocampus CA3</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebral cortex</td>
<td>H
...GluK2 Kainate Receptor Neurons
Introduction
<table class="infobox infobox-cell">
<tr>
<th class="infobox-header" colspan="2">GluK2 Kainate Receptor Neurons</th>
</tr>
<tr>
<td class="label">Taxonomy</td>
<td>ID</td>
</tr>
<tr>
<td class="label">Cell Ontology (CL)</td>
<td>[CL:0000197](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000197)</td>
</tr>
<tr>
<td class="label">Receptor Type</td>
<td>GluK2 (GRIK2, KAR2)</td>
</tr>
<tr>
<td class="label">Family</td>
<td>Ionotropic glutamate (kainate receptor)</td>
</tr>
<tr>
<td class="label">Signaling Mechanism</td>
<td>Ligand-gated ion channel, Ca2+ permeable (unedited)</td>
</tr>
<tr>
<td class="label">Primary Location</td>
<td>Hippocampus, cortex, amygdala</td>
</tr>
<tr>
<td class="label">Structure</td>
<td>Homomeric or heteromeric with GluK3/GluK5</td>
</tr>
<tr>
<td class="label">Calcium Permeability</td>
<td>High (Q/R unedited)</td>
</tr>
<tr>
<td class="label">Receptor Type</td>
<td>Composition</td>
</tr>
<tr>
<td class="label">GluK2 homomer</td>
<td>GluK2 × 4</td>
</tr>
<tr>
<td class="label">GluK2/K3</td>
<td>GluK2 + GluK3</td>
</tr>
<tr>
<td class="label">GluK2/K5</td>
<td>GluK2 + GluK5</td>
</tr>
<tr>
<td class="label">Region</td>
<td>GluK2 Expression</td>
</tr>
<tr>
<td class="label">Hippocampus CA3</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebral cortex</td>
<td>High</td>
</tr>
<tr>
<td class="label">Amygdala</td>
<td>High</td>
</tr>
<tr>
<td class="label">Striatum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Brainstem</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Agent</td>
<td>Mechanism</td>
</tr>
<tr>
<td class="label">UBP-310</td>
<td>GluK2/3 antagonist</td>
</tr>
<tr>
<td class="label">LY377</td>
<td>GluK2 selective</td>
</tr>
<tr>
<td class="label">Concanavalin A</td>
<td>Increase desensitization</td>
</tr>
</table>
Gluk2 Kainate 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.
Overview
Mermaid diagram (expand to render)
GluK2 Kainate Receptor Neurons are neurons expressing the GluK2 (KAR2) receptor, a member of the Ionotropic glutamate receptor family. These receptor neurons play crucial roles in excitatory signaling, synaptic integration and are implicated in various neurological and neurodegenerative conditions. [@ionotropic]
<!-- multi-taxonomy-enrichment -->
Multi-Taxonomy Classification
Taxonomy Database Cross-References
External Database Links
- [Cell Ontology (CL:0000197)](https://www.ebi.ac.uk/ols4/ontologies/cl/classes/http%253A%252F%252Fpurl.obolibrary.org%252Fobo%252FCL_0000197)
- [OBO Foundry (CL:0000197)](http://purl.obolibrary.org/obo/CL_0000197)
- [Allen Brain Cell Atlas](https://portal.brain-map.org/atlases-and-data/bkp/abc-atlas)
- [CellxGene Census](https://cellxgene.cziscience.com/)
- [Human Cell Atlas](https://www.humancellatlas.org/)
Receptor Properties
Function
GluK2 Kainate Receptor Neurons are neurons expressing the [GluK2 receptor](/entities/grik2), a major subunit of the [Ionotropic glutamate receptor](/mechanisms/glutamate-receptors) family (kainate receptor subclass). These receptor neurons play crucial roles in [excitatory signaling](/mechanisms/excitotoxicity), [synaptic integration](/mechanisms/synaptic-integration), [epileptogenesis](/diseases/epilepsy), and are implicated in [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), and [depression](/diseases/depression-neurodegeneration).
Ion Channel Properties
GluK2 receptors conduct sodium (Na+), potassium (K+), and calcium (Ca2+):
- Single-channel conductance: 10-20 pS
- Q/R editing site: Site Q/R in TMD2 — editing reduces Ca2+ permeability
- Desensitization: Slow, incomplete recovery
- RNA editing: ADAR2-mediated Q/R editing reduced in some diseases
Subunit Combinations
Distribution in Brain
Disease Implications
GluK2 receptor neurons are implicated in several conditions:
Alzheimer's Disease
- [Calcium dysregulation](/mechanisms/calcium-dysregulation-alzheimers): High Ca2+ influx via GluK2
- [Synaptic dysfunction](/mechanisms/synaptic-dysfunction-pathway): Aβ alters GluK2 trafficking
- [Excitotoxicity](/mechanisms/excitotoxicity): Enhanced Ca2+-mediated toxicity
- [Hippocampal CA3](/brain-regions/hippocampus): Vulnerable to Aβ-induced GluK2 dysregulation
Parkinson's Disease
- [Striatal signaling](/brain-regions/striatum): GluK2 modulates dopaminergic circuits
- [Excitotoxicity](/mechanisms/excitotoxicity): Enhanced in PD models
- [Subthalamic nucleus](cell-types/subthalamic-nucleus): High GluK2 expression
Amyotrophic Lateral Sclerosis (ALS)
- [Motor neuron vulnerability](/diseases/amyotrophic-lateral-sclerosis): GluK2 changes in motor neurons
- [Excitotoxicity hypothesis](/mechanisms/excitotoxicity): kainate receptor involvement
- [Riluzole interactions](/therapeutics/riluzole): Known to affect kainate receptors
Depression
- [Hippocampal plasticity](/mechanisms/synaptic-plasticity): GluK2 in mood regulation
- [Fast-spiking interneurons](/cell-types/parvalbumin-interneurons): GluK2 in inhibition
Epilepsy
- [Seizure genesis](/diseases/epilepsy): Unedited GluK2 increases seizure susceptibility
- [Q/R editing deficit](/mechanisms/rna-editing-deficit): Reduced editing in epileptic tissue
- [Kindling](/mechanisms/kindling-epilepsy): GluK2 plasticity in epileptogenesis
Therapeutic Targets
GluK2 Receptor Modulators
Q/R Editing as Target
- Enhance editing: Upregulate ADAR2 to reduce Ca2+ permeability
- Gene therapy: Increase GluK2 Q/R ratio
- Small molecules: Editing enhancers in development
Clinical Applications
- Epilepsy: GluK2 antagonists reduce seizure activity
- Neuroprotection: Block excessive Ca2+ influx
- Mood disorders: Modulation of hippocampal circuits
See Also
- [Hippocampus](/brain-regions/hippocampus)
- [Cerebral Cortex](/brain-regions/cerebral-cortex)
- [Amygdala](/brain-regions/amygdala)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Parkinson's Disease](/diseases/parkinsons-disease)
- [Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
- [Epilepsy](/diseases/epilepsy)
- [Depression](/diseases/depression-neurodegeneration)
- [Kainate Receptor Neurons](/cell-types/kainate-receptor-neurons)
- [GluK1 Kainate Receptor Neurons](/cell-types/gluk1-kainate-receptor-neurons)
- [Glutamate Receptors](/mechanisms/glutamate-receptors)
- [Ion Channel Function](/mechanisms/ion-channel-function)
- [Excitotoxicity](/mechanisms/excitotoxicity)
- [Calcium Dysregulation](/mechanisms/calcium-dysregulation-alzheimers)
- [Synaptic Integration](/mechanisms/synaptic-integration)
Background
The study of Gluk2 Kainate 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.
External Links
- [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
- [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
- [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
Pathway Diagram
The following diagram shows the key molecular relationships involving GluK2 Kainate Receptor Neurons discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)