Experimental Preeclampsia Causes Long-Lasting Hippocampal Vascular Dysfunction and Memory Impairment

Area of Science:

• Neuroscience
• Cardiovascular Science
• Reproductive Medicine

Background:

• Preeclampsia (PE) is a pregnancy disorder linked to later-life cognitive decline and dementia.
• Long-term effects of PE on brain vasculature, particularly the hippocampus, are not well understood.

Purpose of the Study:

• To investigate the long-lasting effects of experimental PE (ePE) on hippocampal function and memory in a rat model.
• To determine if ePE impacts hippocampal arteriole (HA) function and neurovascular coupling later in life.

Main Methods:

• Experimental PE (ePE) was induced in rats using a high-cholesterol diet during gestation.
• Hippocampal-dependent memory and HA vasoreactivity were assessed 5 months after pregnancy in ePE and control groups.

Main Results:

• Rats with a history of ePE exhibited hypertension and impaired HA vasoreactivity.
• ePE rats showed deficits in long-term memory but not spatial memory.
• These findings suggest lasting endothelial and vascular smooth muscle dysfunction in HAs post-PE.

Conclusions:

• This ePE rat model replicates long-term cardiovascular and cognitive consequences observed in women post-PE.
• Dysfunction in hippocampal arterioles may represent a novel mechanism linking PE to early-onset dementia.
• PE can lead to persistent vascular and cognitive impairments affecting the brain's memory centers.