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Related Concept Videos

Epilepsy and Seizures: Overview01:24

Epilepsy and Seizures: Overview

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Epilepsy is a chronic neurological disease marked by recurrent, unpredictable seizures. These seizures are caused by abnormal electrical discharges in the brain, leading to behavior, sensation, or consciousness alterations. They can also cause transient impairment of awareness, interfering with daily activities.
Various factors can trigger epilepsy, including genetic factors, brain damage, metabolic causes, and unknown etiology. Diagnosis of epilepsy involves electroencephalography (EEG), which...
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Antiepileptic Drugs: Glutamate Antagonists01:14

Antiepileptic Drugs: Glutamate Antagonists

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Glutamate is a fundamental neurotransmitter in the central nervous system, playing a vital role in neuronal communication and various cognitive processes. Glutamate stands as the principal excitatory neurotransmitter in the brain. Its presence is crucial for the communication between neurons, underpinning essential processes such as synaptic transmission, neuronal excitability, and plasticity. These functions are vital for higher-order cognitive processes, including learning and memory. The...
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Nervous Tissue: Myelin01:25

Nervous Tissue: Myelin

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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
Schwann cells begin to form myelin sheaths around axons during fetal development. They wrap around a small...
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Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

Antiepileptic Drugs: GABAergic Pathway Potentiators

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γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
The key GABA pathway potentiators used in epilepsy management are as follows.
Benzodiazepines are a well-known class of drugs used for...
710
Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein01:20

Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein

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Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
473
Seizures: Classification01:13

Seizures: Classification

629
Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
Seizures are typically classified into two main categories: focal and generalized seizures.
Focal Seizures
Focal seizures originate from specific regions of the brain. These seizures are further sub-classified into two types:
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Related Experiment Video

Updated: Sep 24, 2025

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Maladaptive myelination promotes generalized epilepsy progression.

Juliet K Knowles1, Haojun Xu2,3, Caroline Soane2

  • 1Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA, USA. Jkk1@stanford.edu.

Nature Neuroscience
|May 2, 2022
PubMed
Summary
This summary is machine-generated.

Absence seizures in epilepsy can drive abnormal myelination, worsening brain network hypersynchrony and disease progression. Blocking this activity-dependent myelination reduced seizure severity and network synchrony.

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Electroconvulsive Seizures in Rats and Fractionation of Their Hippocampi to Examine Seizure-induced Changes in Postsynaptic Density Proteins
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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Epilepsy Research

Background:

  • Activity-dependent myelination normally refines neural network function.
  • Aberrant neuronal activity, such as in epilepsy, may lead to maladaptive myelination, contributing to disease pathogenesis.
  • Absence seizures, characterized by generalized electroencephalography (EEG) spike-wave discharges, are a key feature of some epilepsy types.

Purpose of the Study:

  • To test if activity-dependent myelination from absence seizures promotes thalamocortical network hypersynchrony and epilepsy progression.
  • To investigate the role of myelination in the pathogenesis of generalized epilepsy with absence seizures.

Main Methods:

  • Examined oligodendrogenesis and myelination in the seizure network of Wag/Rij rats and Scn8a+/mut mice after epilepsy onset.
  • Utilized pharmacological seizure inhibition in Wag/Rij rats to assess the impact on myelination.
  • Blocked activity-dependent myelination to evaluate effects on seizure burden and EEG coherence (ictal synchrony).

Main Results:

  • Increased oligodendrogenesis and myelination were observed specifically within the seizure network in both epilepsy models post-onset.
  • Aberrant myelination was prevented by pharmacological seizure inhibition.
  • Blocking activity-dependent myelination led to decreased seizure burden and reduced ictal synchrony.

Conclusions:

  • Activity-dependent myelination driven by absence seizures contributes to epilepsy progression.
  • Maladaptive myelination may be a pathogenic mechanism in certain epilepsies and other neurological disorders.
  • Targeting activity-dependent myelination could be a therapeutic strategy for epilepsy.