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Updated: Aug 7, 2026
Assessment of Maternal Vascular Remodeling During Pregnancy in the Mouse Uterus
Published on: December 5, 2015
Hypervolemia of pregnancy is not maintained in mice chronically overexpressing angiotensinogen
Terry K Morgan1, Andreas Rohrwasser, Ling Zhao
1Department of Human Genetics, University of Utah Health Sciences Center, Salt Lake City, UT, USA. morgante@ohsu.edu
Objective:
Women who develop pre-eclampsia show significantly less hypervolemia of pregnancy, compared with controls. We have shown that chronically elevated angiotensinogen expression increases a woman's risk of developing pre-eclampsia. Our objective was to determine whether increased angiotensinogen expression is sufficient to cause failed hypervolemia.
Study Design:
To isolate the effects of elevated angiotensinogen expression, we studied transgenic mice with either 2 or 3 copies of the murine angiotensinogen gene. Plasma volume was measured by Evans blue dye dilution, and kidney sections were immunostained for angiotensinogen and renin.
Results:
Three-copy mice failed to maintain hypervolemia after midgestation (P < .01) and failed to up-regulate renin expression in the distal nephron, compared with 2-copy controls. Intrarenal angiotensinogen was up-regulated during pregnancy in both genotypes.
Conclusion:
Chronically elevated angiotensinogen expression is sufficient to cause failed hypervolemia of pregnancy. Whether this observation is related to failed up-regulation of distal tubule renin expression requires further study.
