Preclinical Models of Epilepsy and Seizure Disorders

Preclinical models of epilepsy and seizure disorders encompass a spectrum of in vitro, ex vivo and in vivo systems designed to recapitulate distinct aspects of seizure initiation, propagation and chronic epileptogenesis. In vitro platforms such as multi-electrode arrays and organotypic brain slices enable high-throughput screening of network hyperexcitability and assessment of novel compounds under controlled conditions. Ex vivo preparations afford detailed mechanistic insight into synaptic and cellular alterations but lack systemic pharmacokinetics. In vivo rodent models remain the cornerstone of translational research. Chemical induction paradigms using pilocarpine or kainic acid produce status epilepticus and progressive hippocampal sclerosis, modelling temporal lobe epilepsy and comorbid cognitive deficits. Electrical kindling protocols elicit gradual seizure sensitisation and facilitate evaluation of seizure thresholds and plasticity. Genetic rodent strains mirror monogenic epilepsies and channelopathies, offering targets for precision therapies. Large-animal models such as sheep or non-human primates provide closer approximation of human neuroanatomy and pharmacodynamics, albeit with higher cost and ethical complexity. Across all models, refinement of welfare measures, adoption of common data elements and integration of telemetry and optogenetics have enhanced validity and reproducibility. Together, these approaches underpin discovery of pathophysiological mechanisms, identification of biomarkers and preclinical evaluation of antiepileptic agents, with the ultimate goal of bridging the gap to clinical trials and personalised therapy.

Research from Nature Portfolio

Recent studies have explored circulating microRNAs as indicators of psychiatric comorbidities in rodent epilepsy models. In electrical post-status epilepticus paradigms, distinct microRNA signatures correlated with behavioural readouts such as social interaction and saccharin preference, as well as with plasma neurotrophic factors. Validation across multiple rat models revealed upregulation of specific microRNAs, highlighting their potential as translational biomarkers for early detection of anxiety and depressive features in epilepsy. These findings underscore the heterogeneous predictive validity of individual models and point towards model-specific panels of biomarkers for monitoring disease progression and therapeutic response.

Preclinical Models of Epilepsy and Seizure Disorders publication trend

The graph below shows the total number of articles in preclinical models of epilepsy and seizure disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Kindling: Repeated subthreshold electrical or chemical stimulation that progressively lowers seizure threshold, modelling epileptogenesis.

Status epilepticus: Prolonged seizure activity induced chemically or electrically in animals to initiate chronic epilepsy.

Multi-electrode array (MEA): In vitro device comprising multiple microelectrodes for simultaneous recording of neuronal network activity.

Optogenetics: Technique employing light-activated proteins to modulate electrical activity of genetically sensitised neurons in real time.

Biomarker: A quantifiable molecular or physiological indicator of pathological state, progression or therapeutic response.

References

1. Decoding Epileptic Seizures: Exploring In Vitro Approaches to Unravel Pathophysiology and Propel Future Therapeutic Breakthroughs. Biomedical Materials & Devices (2024).
2. An exploratory approach to identify microRNAs as circulatory biomarker candidates for epilepsy-associated psychiatric comorbidities in an electrical post-status epilepticus model. Scientific Reports (2023).
3. Opportunities for improving animal welfare in rodent models of epilepsy and seizures. Journal of Neuroscience Methods (2015).
4. EEG Radiotelemetry in Small Laboratory Rodents: A Powerful State‐of‐the Art Approach in Neuropsychiatric, Neurodegenerative, and Epilepsy Research. Neural Plasticity (2015).
5. Preclinical common data elements for general pharmacological studies (pharmacokinetic sample collection, tolerability, and drug administration). A report of the TASK3‐WG1A General Pharmacology Working Group of the ILAE/AES Joint Translational Task Force. Epilepsia Open (2023).
6. Toward evidence‐based severity assessment in rat models with repeated seizures: II. Chemical post–status epilepticus model. Epilepsia (2019).
7. Design of composite measure schemes for comparative severity assessment in animal-based neuroscience research: A case study focussed on rat epilepsy models. PLOS ONE (2020).
8. Cortical epileptogenesis of slowly kindled freely moving rats. Acta Marisiensis - Seria Medica (2014).