Aging, serum estradiol levels, and pregnancy differentially affect vascular reactivity of the rat uterine artery

OBJECTIVE: To determine whether placenta and plasma of preeclamptic women women contain factors that cause endothelial cell damage. METHODS: Placental extracts and plasma from preeclamptic and normotensive women were added cultures of normal human umbilical vein endothelial cells and their effect and their viability, was determined by MTT reduction and (51)chromium release. RESULTS: Placental extracts from normotensive and preeclamptic women were cytotoxic to endothelial cells, but riot the plasma from bath groups. Mean +/- standard deviation values of cytotoxicity index in preeclamptic and normotensive placental extract ts using the MTT reduction were 70.3 +/- 6.76% and 51.4 +/- 8.81%, respectively, showing a significant difference (P < .0001). Using the (51)chromium-release assay, preeclamptic placental extracts showed cytotoxic effects of 87.6 +/- 13.47% compared with 17 +/- 20.60% in control patients. The cytotoxic activity decreased after trypsin digestion and heat treatment in both groups. CONCLUSIONS: A cytotoxic factor to endothelial cells in placental extracts of preeclamptic women was identified. This compounds is thermolabile and sensitive to trypsin digestion. Copyright (C) 2000 by the Society for Gynecologic Investigation.