GABA in ischemic stroke. Proton magnetic resonance study.

Area of Science:

• Neuroscience
• Neurology
• Biochemistry

Background:

• Experimental studies suggest ischemic stroke alters gamma-aminobutyric acid (GABA) levels, potentially leading to GABA-ergic dysfunction.
• Animal models indicate excitatory neurotransmitter overactivity and reduced GABAergic tone in remote neocortical regions post-stroke.
• Human data on GABAergic changes in brain areas outside the stroke lesion are limited, yet these regions may be therapeutic targets.

Purpose of the Study:

• To assess GABA levels in structurally normal brain regions distant from the ischemic lesion using proton magnetic resonance spectroscopy ((1)H MRS).
• To investigate changes in GABAergic function outside the infarct in patients with ischemic stroke.

Main Methods:

• A comparative study involving 31 patients with first-ever ischemic stroke and 20 healthy subjects.
• Single-voxel (1)H MRS was employed to measure GABA/Creatine (GABA/Cr) ratios in prefrontal regions distant from the lesion.
• Metabolite levels (GABA, NAA, Cho, mI, Glx) were assessed in the acute phase and 3 months post-stroke.

Main Results:

• Patients exhibited lower GABA levels both early after stroke and at the 3-month follow-up.
• The reduction in GABA levels was specifically observed in the frontal cortex ipsilateral to the lesion during the second examination.
• No significant changes were noted in other measured metabolites.

Conclusions:

• Findings suggest a decrease in GABA function in brain areas remote from the ischemic lesion.
• The observed GABA alterations may play a role in stroke recovery and warrant further investigation.
• These results highlight the potential of targeting GABAergic dysfunction for therapeutic interventions in stroke patients.