HINT2-Mediated Mitochondrial Modulation Contributes to G-CSF Neuroprotection in Alcohol Use Disorder-Related Ischemic...

Area of Science:

• Neuroscience
• Mitochondrial Biology
• Pharmacology

Background:

• Alcohol use disorder (AUD) exacerbates ischemic stroke severity.
• Mitochondrial dysfunction and oxidative stress are key pathological mechanisms in stroke.
• The role of histidine triad nucleotide-binding protein 2 (HINT2) in AUD-related stroke is unclear.

Purpose of the Study:

• To investigate HINT2's role in mitochondrial dysfunction and oxidative stress during AUD-related ischemic stroke.
• To determine if granulocyte colony-stimulating factor's (G-CSF) neuroprotective effects are mediated by HINT2.

Main Methods:

• AUD was induced in rats using a two-bottle choice paradigm.
• Focal cerebral ischemia was induced via middle cerebral artery occlusion (MCAO).
• HINT2 expression was modulated using small interfering RNA; G-CSF was administered.
• Mitochondrial function (membrane potential, ROS), infarct volume, and neurological deficits were assessed.

Main Results:

• G-CSF significantly reduced infarct volume and improved neurological outcomes in AUD + MCAO rats.
• G-CSF partially restored mitochondrial membrane potential and reduced reactive oxygen species (ROS) production.
• HINT2 suppression attenuated G-CSF's beneficial effects on ROS and mitochondrial function.
• HINT2 expression was downregulated post-ischemia but restored by G-CSF.

Conclusions:

• HINT2 plays a crucial role in mediating G-CSF's neuroprotective effects against AUD-related ischemic stroke.
• The G-CSF-HINT2-mitochondrial axis is a potential therapeutic target for stroke patients with AUD.
• Modulating HINT2 may improve outcomes in ischemic stroke complicated by alcohol use disorder.