Neurobiology of Seizures and Epilepsy
Start with the big picture
Seizures involve hypersynchronous, hyperexcitable neuronal networks. A paroxysmal depolarization shift can trigger burst firing and recruit neighboring neurons, while increased glutamatergic activity and reduced GABAergic inhibition favor excitation. Ion-channel defects can further alter neuronal firing. The lesson links these mechanisms to drug targets: sodium-channel inactivation limits repetitive firing; thalamic T-type calcium channels are associated with absence-epilepsy spike-and-wave discharges; and other targets include high-voltage-activated calcium channels, SV2A, potassium channels, glutamate and GABA systems, and carbonic anhydrase. It also introduces mTOR pathway hyperactivity as a contributor to epileptogenesis and places these mechanisms in the context of seizure propagation and network remodeling.
What you'll learn
- Describe how hypersynchronous neuronal activity and paroxysmal depolarization shifts contribute to seizures.
- Explain the balance between glutamatergic excitation and GABAergic inhibition in seizure generation.
- Relate sodium, calcium, potassium, and chloride channel changes to neuronal excitability.
- Match major antiseizure drug targets with their effects on neurotransmission or membrane stability.
- Recognize the roles of SV2A and mTOR pathway activity in seizure mechanisms.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
