In relation to seizure pathophysiology, what role does GABA play in seizures?

• A. GABA is the main excitatory neurotransmitter
• B. GABA is the main inhibitory neurotransmitter; decreased GABA activity or receptor dysfunction reduces inhibition and increases excitability
• C. GABA has no role in seizures
• D. GABA is only involved in peripheral nerves

Answer: (B)

GABA's role in seizures centers on inhibitory control in the brain. GABA is the main inhibitory neurotransmitter in the CNS; when its signaling is reduced or its receptors are dysfunctional, inhibition weakens and neuronal networks become more excitable, making seizures more likely. In normal circuits, GABAergic interneurons dampen activity and keep firing patterns from becoming synchronized across brain regions. When GABA-mediated inhibition is compromised, glutamatergic excitation can dominate, leading to the hypersynchronous discharge that defines seizures. Strengthening GABAergic transmission helps control seizures, which is why many antiseizure drugs enhance GABA activity. The other statements miss the mark: GABA is not the main excitatory transmitter (glutamate is); GABA has a central, not negligible, role in seizures; and its crucial function is in the CNS, not limited to peripheral nerves.