Excessive Hypercholesterolemia in Pregnancy Impairs Later-Life Maternal Vascular Function in Rats

Area of Science:

• Reproductive biology
• Cardiovascular science
• Endocrinology

Background:

• Preeclampsia is a known risk factor for later-life cardiovascular disease, but underlying mechanisms remain unclear.
• Pregnancy hypercholesterolemia can induce preeclampsia-like symptoms.
• The long-term impact of pregnancy hypercholesterolemia on maternal vascular function requires further investigation.

Purpose of the Study:

• To investigate the long-term effects of excessive hypercholesterolemia during pregnancy on maternal vascular function.
• To characterize the specific vascular beds affected by pregnancy-induced hypercholesterolemia.

Main Methods:

• Sprague Dawley rats were fed a control or high-cholesterol diet during pregnancy.
• Maternal vascular function was assessed three months postpartum.
• Vascular responses, including vasodilation, vasoconstriction, myogenic response, and arterial stiffness, were measured in different arteries.

Main Results:

• High-cholesterol diet during pregnancy reduced endothelium-dependent vasodilation in carotid arteries.
• Increased vasoconstriction and reduced nitric oxide modulation were observed in carotid arteries.
• Carotid arteries showed decreased myogenic response, increased stiffness, and reduced elastin density.
• These vascular changes were specific to the carotid arteries and did not occur in mesenteric, coronary arteries, or aortas, nor in non-pregnant rats.

Conclusions:

• Excessive hypercholesterolemia during pregnancy has lasting detrimental effects on maternal vascular function, particularly in the carotid arteries.
• Understanding pregnancy-specific hypercholesterolemia mechanisms can inform interventions to mitigate cardiovascular disease risk in affected women.