Recent Progress in Therapeutic Strategies for Ischemic Stroke

Area of Science:

• Neuroscience
• Regenerative Medicine
• Stroke Research

Background:

• Stroke treatment strategies include acute neuroprotection and chronic stem cell therapy.
• Previous research identified a neuroprotection window (12-48h) post-ischemia.
• Investigated temporal and spatial expression of key proteins (c-fos, HIF-1α, HSP70, annexin V) after transient middle cerebral artery occlusion in rats.

Purpose of the Study:

• To evaluate the neuroprotective effects of glial cell line-derived neurotrophic factor (GDNF) and hepatocyte growth factor (HGF) in ischemic stroke models.
• To assess the potential of induced pluripotent stem cells (iPSCs) for neural regeneration after stroke.
• To explore combined therapeutic strategies for stroke treatment.

Main Methods:

• Administered GDNF via Sendai viral vector gene transfer into post-ischemic rat brains.
• Administered GDNF and HGF proteins into post-ischemic rat brains.
• Transplanted undifferentiated iPSCs into the ischemic striatum and cortex of rats.

Main Results:

• Sendai virus-mediated GDNF gene transfer demonstrated significant neuroprotection.
• GDNF and HGF reduced infarct size, apoptosis (TUNEL-positive cells), and autophagy (LC3-positive cells).
• iPSC transplantation yielded doublecortin-positive neuroblasts but also resulted in teratoma formation.

Conclusions:

• GDNF and HGF exhibit both anti-apoptotic and anti-autophagic effects, reducing stroke-induced damage.
• iPSCs hold potential for neural cell replacement after ischemic brain injury, provided tumorigenesis is managed.
• Combining neurotrophic factor therapy with stem cell transplantation may offer a more effective stroke treatment approach.