Older pregnant mice had impaired uterine blood vessel growth
A mouse experiment found impaired artery remodeling in older pregnant animals, alongside delayed embryo development and deficient blood vessel development in the placenta.
Limit: Later cardiovascular disease was not measured
Edited by Boris Djordjevic · AgingResearch.News
In an experiment using a mouse model of pregnancy at advanced maternal age, researchers examined blood vessel changes in the decidua, the uterine lining during pregnancy. These vessels normally expand and remodel rapidly to support pregnancy.
The older pregnant mice had impaired formation of new blood vessels in this lining. Their spiral arteries, blood vessels in the uterus, also remodeled poorly. The researchers found delayed embryo development and deficient blood vessel development in the placenta. They also found imbalances in molecules that regulate blood vessel growth, both throughout the body and locally in the uterus.
Why it matters
The researchers suggested that pregnancy may expose vascular aging mechanisms that contribute to declining reproductive success and increased cardiovascular risk later in life.
Caveats
This animal experiment does not establish effects in people or whether these changes contribute to later cardiovascular disease. The paper is a preprint and has not yet been peer-reviewed.
The paper
Advanced Maternal Age Impairs Decidual Angiogenesis and Spiral Artery Remodelling
University of Alberta
bioRxiv, Oct 23, 2026, Open access, CC BY, Preprint, not peer-reviewed
