The dentate gyrus is a critical hippocampal structure that serves as the gateway for cortical information flow into the hippocampus. In temporal lobe epilepsy (TLE), dentate gyrus neurons undergo substantial remodeling, including granule cell dispersion, mossy fiber sprouting, and progressive loss of inhibitory interneurons.
| Taxonomy |
ID |
Name / Label |
| Cell Ontology (CL) |
CL:4023062 |
dentate gyrus neuron |
- Morphology: dentate gyrus neuron (source: Cell Ontology)
- Morphology can be inferred from Cell Ontology classification
Excessive glutamate release leads to:
- NMDA receptor overactivation
- Calcium influx and intracellular overload
- Activation of pro-apoptotic pathways (caspase-3, PARP)
- Mitochondrial permeability transition
Aberrant reorganization of mossy fiber axons creates recurrent excitatory circuits:
- New synaptic connections between granule cells
- Enhanced excitability and seizure propagation
- Loss of dentate gyrus filtering function
- IL1B: Pro-inflammatory cytokine elevated in TLE
- TNF: TNF-alpha contributes to blood-brain barrier disruption
- GFAP: Astrocyte activation and reactive gliosis
- Microglial activation and phagocytosis of neurons
- Increased ROS production from mitochondrial dysfunction
- Reduced antioxidant defenses (glutathione, SOD)
- DNA damage and lipid peroxidation
- Impaired neurogenesis
- Reduced proliferation of neural stem cells
- Abnormal migration and integration of new neurons
- Contribution to epileptogenic circuit formation
¶ Key Genes and Proteins
| Gene/Protein |
Role in TLE |
Expression Change |
| GFAP |
Astrocyte marker |
Upregulated |
| IL1B |
Pro-inflammatory |
Increased |
| TNF |
Cytokine |
Elevated |
| BDNF |
Neurotrophin |
Increased |
| SST |
Somatostatin (interneuron marker) |
Decreased |
| CALB1 |
Calbindin (granule cell marker) |
Decreased |
- Temporal Lobe Epilepsy: Most common focal epilepsy in adults
- Hippocampal Sclerosis: Common pathological finding in TLE
- Mesial Temporal Sclerosis: Selective neuronal loss in hippocampus
- Febrile Seizures: Early-life seizures as risk factor for TLE
- Alzheimer's Disease: Comorbidity with TLE, shared mechanisms
- Levetiracetam: Targets SV2A synaptic vesicle protein
- Lacosamide: Enhances sodium channel slow inactivation
- Valproic acid: Broad-spectrum GABA enhancement
- Neuroprotective agents: Ceftriaxone (GLT-1 activator), minocycline
- Anti-inflammatory drugs: Targeting IL-1beta, TNF-alpha
- Antioxidant therapy: Coenzyme Q10, vitamin E
- Mitochondrial stabilizers: PGC-1alpha agonists
- Anterior temporal lobectomy for drug-resistant TLE
- Selective amygdalohippocampectomy
- Laser ablation of seizure focus