Hepatocyte growth factor attenuates cerebral ischemia-induced learning dysfunction

Area of Science:

• Neuroscience
• Regenerative Medicine
• Vascular Biology

Background:

• Hepatocyte growth factor (HGF) is known for organ regeneration and protection, including mitigating cell death from cerebral ischemia.
• The impact of HGF on cognitive functions, specifically learning and memory, following cerebral ischemic events remains unexplored.

Purpose of the Study:

• To investigate the therapeutic potential of human recombinant HGF (hrHGF) in restoring learning and memory deficits after cerebral ischemia.
• To elucidate the underlying mechanisms of hrHGF action, focusing on blood-brain barrier integrity and endothelial cell survival.

Main Methods:

• Microsphere embolism was used to induce cerebral ischemia in a rodent model.
• Learning and memory were assessed using the water maze task at various time points post-ischemia.
• Blood-brain barrier integrity was evaluated by measuring FITC-albumin leakage.
• Apoptotic death of cerebral endothelial cells was quantified.

Main Results:

• Intraventricular administration of hrHGF significantly reduced the prolongation of escape latency in both acquisition and retention phases of the water maze test.
• hrHGF treatment markedly decreased blood-brain barrier disruption, evidenced by reduced FITC-albumin leakage.
• This protective effect on the blood-brain barrier was linked to the prevention of apoptotic death in cerebral endothelial cells.

Conclusions:

• hrHGF administration can ameliorate learning and memory dysfunction occurring soon after sustained cerebral ischemia.
• The neuroprotective effects of hrHGF are mediated, in part, by preserving the integrity of cerebral endothelial cells and the blood-brain barrier.
• HGF represents a promising therapeutic strategy for cerebrovascular diseases such as cerebral infarct and vascular dementia.