Hepatocyte growth factor improved learning and memory dysfunction of microsphere-embolized rats

Area of Science:

• Neuroscience
• Regenerative Medicine
• Cerebrovascular Research

Background:

• Hepatocyte growth factor (HGF) is known for its regenerative and protective effects in various organs.
• HGF can attenuate cell death induced by cerebral ischemia, but its impact on cognitive function post-ischemia is not well understood.
• Cerebral ischemia can lead to significant learning and memory deficits.

Purpose of the Study:

• To investigate the effect of human recombinant HGF (hrHGF) on learning and memory function following cerebral ischemia.
• To explore the underlying mechanisms of hrHGF's neuroprotective effects in the context of cerebral ischemia.

Main Methods:

• Cerebral ischemia was induced using microsphere embolism in a rodent model.
• Administration of hrHGF into the ventricle was performed.
• Water maze tasks were used to assess learning and memory (acquisition and retention).
• Histological analysis evaluated viable brain area, cerebral vessel density, and TUNEL-positive endothelial cells.

Main Results:

• hrHGF administration significantly reduced the prolongation of escape latency in water maze tests, indicating improved learning and memory.
• Treatment with hrHGF attenuated the reduction in viable brain area and the density/number of perfused cerebral vessels in the ischemic hemisphere.
• hrHGF treatment decreased the number of TUNEL-positive cerebral endothelial cells, suggesting protection against endothelial cell injury.

Conclusions:

• hrHGF administration effectively prevents learning and memory dysfunction after sustained cerebral ischemia.
• The protective effects of hrHGF appear to be mediated by safeguarding cerebral endothelial cells from ischemic injury.
• HGF treatment represents a promising therapeutic strategy for cerebrovascular diseases, including cerebral infarct and vascular dementia.