Expression of ABCA1 Transporter and LXRA/LXRB Receptors in Placenta of Women with Late Onset Preeclampsia

Abstract

Background: Appropriate levels of cholesterol are necessary for the mother and developing fetus, but theirexcess may cause preeclampsia. The ABCA1 transporter mediates the secretion of cholesterol and is highly regulated at the transcriptional level via the nuclear liver X receptors (LXRs).

Methods: Sixteen preeclamptic and 39 normotensives healthy women with uncomplicated pregnancies were involved in the case-control study. The placental levels of ABCA1, LXRA and LXRB mRNA were quantified by real-time quantitative PCR. The concentrations of ABCA1, LXRA and LXRB proteins from the placenta were determined using an enzyme-linked immunosorbent assay Results: We found in the logistic regression model significantly lower placental expression of LXRB mRNA (crude OR = 0.26, 95% CI: 0.07-0.94, p = 0.040) and LXRA protein level (crude OR = 0.19, 95% CI: 0.05-0.69, p = 0.012) in late-onset preeclamptic women compared to healthy pregnant women. The values remained statistically significant after adjustment for possible confounders.

Conclusions: Our results suggest that high placenta LXRA mRNA and LXRA protein expression levels decrease the risk of late-onset preeclampsia. These nuclear receptors could play a role in the development of preeclampsia through disturbances of lipid metabolism.

Keywords: adenosine triphosphate-binding cassette transporter A1 (ABCA1); gene expression; liver X receptors (LXRs); preeclampsia (PE); protein level.

Figure 1

Electrophoretic separation of intact total RNA on a 1.5% denaturing agarose gel. M–1KB DNA Ladder, 1,2–RNA samples. The 18S and 28S ribosomal RNA bands are clearly visible in the intact RNA sample.

Figure 2

Protein expression level of LXRA in placentas of women with preeclampsia and healthy pregnant women.