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The signs of pre-eclampsia are thought to arise from maternal endothelial dysfunction caused by circulating factors of placental origin. Syncytiotrophoblast microvillous membranes (STBM) cause endothelial disruption and inhibit proliferation in vitro. Significantly increased amounts of STBM can be detected in blood from pre-eclamptic women and could contribute to endothelial dysfunction in vivo. This study purified a complex from STBM which inhibits the proliferation of cultured human endothelial cells. Integral membrane proteins were solubilized with sucrose monolaurate. Anion exchange chromatography yielded two peaks of anti-proliferative activity. Only the second peak was specific to STBM and was subjected to further separation by Sephacryl S-200 gel filtration chromatography (GFC). A single peak of specific activity eluted close to the void volume, at a position unaltered by added denaturing agents, guanidium chloride or urea. On Sephacryl S-300 GFC, two peaks were obtained of 410 and 820 kDa, with similar anti-proliferative activity and protein components (by SDS-polyacrylamide gel electrophoresis). The major protein bands were as integrins alpha5 and alpha v, dipeptidyl peptidase IV, alpha-actinin, transferrin, transferrin receptor, placental alkaline phosphatase and monoamine oxidase A.

Original publication

DOI

10.1053/plac.1998.0351

Type

Journal article

Journal

Placenta

Publication Date

01/1999

Volume

20

Pages

71 - 79

Keywords

Actinin, Alkaline Phosphatase, Cell Division, Cells, Cultured, Centrifugation, Density Gradient, Chromatography, Gel, Chromatography, Ion Exchange, Endothelium, Vascular, Female, Humans, Integrins, Membrane Proteins, Microvilli, Monoamine Oxidase, Pre-Eclampsia, Pregnancy, Sucrose, Transferrin, Trophoblasts, Umbilical Veins