Hippocampal transcriptome profiling reveals common disease pathways in chronic hypoperfusion and aging

Area of Science:

• Neuroscience
• Genomics
• Vascular Biology

Background:

• Vascular dementia (VaD) is a progressive cognitive impairment linked to vascular issues like cerebral hypoperfusion.
• The aging population faces an increasing burden of VaD, with the hippocampus being particularly vulnerable.
• Understanding the molecular mechanisms of hypoperfusion-induced hippocampal damage is crucial for VaD research.

Purpose of the Study:

• To investigate the hippocampal gene expression profile in young and aged mice subjected to cerebral hypoperfusion.
• To identify common and distinct molecular pathways affected by hypoperfusion and aging in the hippocampus.
• To establish a genetic framework for hypoperfusion-induced hippocampal damage relevant to VaD.

Main Methods:

• Cerebral hypoperfusion induced via bilateral common carotid artery stenosis (BCAS) in young and aged mice.
• Transcriptomic analysis of hippocampal gene expression.
• Immunoblot analyses to confirm gene expression findings.

Main Results:

• Aging naturally reduces cerebral blood flow and alters hippocampal gene expression.
• BCAS in young mice induced hippocampal gene expression changes similar to those in aged mice.
• BCAS had minimal impact on aged mice's cerebral blood flow or hippocampal gene expression over 30 days.
• Common cell-specific genes were identified in young BCAS and aged sham mice.

Conclusions:

• Hypoperfusion-induced hippocampal damage shares molecular pathways with aging.
• The study provides a genetic basis for understanding VaD pathophysiology.
• Identified common cellular signaling pathways are key targets for future VaD research.