Postischemic diazepam is neuroprotective in the gerbil hippocampus

Area of Science:

• Neuroscience
• Pharmacology

Background:

• Ischemic stroke causes neuronal damage, particularly in the hippocampus.
• Gamma-aminobutyric acid (GABA) neurotransmission plays a crucial role in regulating neuronal excitability.

Purpose of the Study:

• To investigate if enhancing GABA neurotransmission post-ischemia offers neuroprotection in the hippocampus.
• To evaluate the neuroprotective effects of diazepam, a GABA-enhancing drug, in a gerbil model of transient forebrain ischemia.

Main Methods:

• Mongolian gerbils underwent transient forebrain ischemia.
• Diazepam was administered at different time points post-ischemia.
• Neuronal viability, brain temperature, hyperactivity, and GABA-gated chloride channel binding were assessed.

Main Results:

• Diazepam significantly reduced brain temperature and post-ischemic hyperactivity.
• Both single and double doses of diazepam provided substantial protection to CA1 pyramidal neurons.
• A correlation was found between reduced hyperactivity and decreased neuronal degeneration.
• Diazepam prevented the loss of [35S]TBPS binding to GABA-gated chloride channels.

Conclusions:

• Enhancing GABA neurotransmission following ischemia can mitigate neuronal excitability and prevent cell death.
• GABA-enhancing drugs like diazepam show potential as neuroprotective agents against ischemic brain injury.