Upregulation of peroxiredoxin-thioredoxin system of lymphocytes and monocytes in preeclampsia

Elsevier

Available online 12 December 2022

Pregnancy HypertensionAuthor links open overlay panelAbstractObjectives

An imbalanced redox homeostasis resulting in oxidative stress is present in preeclampsia. Several antioxidant systems have been characterized, but not all were delineated in preeclampsia. Such are the peroxiredoxin-1 (PRDX1) and thioredoxin-1 (TRX1) regulatory enzymes that are also contributing to the redox homeostasis. We hypothesized that PRDX1 and TRX1 will be affected in preeclampsia. Thus, we have aimed to characterize PRDX1, TRX1 and oxidative stress biomarkers in blood samples of pregnant women with preeclampsia.

Study design: Twelve patients with preeclampsia (PE) were enrolled into the study. Seven third trimester healthy pregnant women (HP) were accepted as control group. Preeclampsia was defined as a new onset hypertension and significant proteinuria.

Main outcome measures: Peripheral venous blood samples of healthy and preeclamptic pregnant women were analyzed. Plasma level of advanced oxidation protein products (AOPP) was determined by spectrophotometry. The PRDX1 and TRX1 expression of lymphocytes and monocytes was detected by flow cytometry.

Results

The plasma AOPP level was significantly higher in preeclampsia compared to the healthy pregnant group. Significantly higher percentage of PRDX1 and TRX1 expressing lymphocytes and monocytes were detected in the blood samples of preeclamptic women compared to healthy pregnant controls. The ratio of circulating PRDX1 and TRX1 expressing lymphocytes and monocytes showed a significant inverse correlation with the birth weight of newborns.

Conclusions

We have revealed that the levels of advanced oxidation protein products are increased and peroxiredoxin-1 and thioredoxin-1 system in lymphocytes and monocytes is upregulated in preeclampsia. In addition, the ratio of peroxiredoxin-1 and thioredoxin-1 positive circulating lymphocytes and monocytes correlates inversely with the neonatal birth weight, which finding indicates that pregnancies complicated by intrauterine growth restriction are accompanied by a higher level of oxidative stress.

Keywords

preeclampsia

oxidative stress

advanced oxidation protein products

antioxidant mechanisms

immune cells

© 2022 The Author(s). Published by Elsevier B.V. on behalf of International Society for the Study of Hypertension in Pregnancy.

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