Peripheral Inflammation, Apolipoprotein E4, and Amyloid-β Interact to Induce Cognitive and Cerebrovascular...

Area of Science:

• Neuroscience
• Cerebrovascular Biology
• Alzheimer's Disease Pathogenesis

Background:

• Cerebrovascular dysfunction is a key process in Alzheimer's disease (AD).
• Apolipoprotein E4 (APOE4), amyloid-beta (Aβ), and peripheral inflammation are known AD risk factors.
• The combined impact of these factors on cerebrovascular health is not fully understood.

Purpose of the Study:

• To investigate the interactive effects of APOE4, Aβ, and chronic peripheral inflammation on cerebrovascular and cognitive function.
• To determine if APOE4 exacerbates Aβ- and inflammation-induced neurovascular damage.

Main Methods:

• Utilized E4FAD mice expressing human APOE4 and overproducing Aβ42.
• Induced chronic peripheral inflammation using lipopolysaccharide (LPS) in E4FAD mice.
• Assessed cognitive function and cerebrovascular integrity, including vascular leakiness and Aβ deposition.

Main Results:

• Peripheral inflammation in E4FAD mice led to cognitive deficits and reduced post-synaptic proteins.
• LPS challenge in E4FAD mice induced cerebrovascular deficits, including leakiness and reduced vessel coverage.
• Cerebral amyloid angiopathy-like Aβ deposition was observed in LPS-challenged E4FAD+ mice.

Conclusions:

• APOE4, Aβ, and peripheral inflammation synergistically contribute to cerebrovascular damage.
• These interacting factors promote cognitive deficits and neuroinflammation in an AD mouse model.
• Understanding these interactions is crucial for developing effective AD therapies.