Behind the Curtain of Abnormal Placentation in Pre-Eclampsia: From Molecular Mechanisms to Histological Hallmarks

Author:

Gusella Anna1ORCID,Martignoni Guido23,Giacometti Cinzia2ORCID

Affiliation:

1. Pathology Unit, Department of Diagnostic Services, ULLS 6 Euganea, 35131 Padova, Italy

2. Department of Pathology, Pederzoli Hospital, 37019 Peschiera del Garda, Italy

3. Department of Diagnostic and Public Health, Section of Pathology, University of Verona, 37129 Verona, Italy

Abstract

Successful human pregnancy needs several highly controlled steps to guarantee an oocyte’s fertilization, the embryo’s pre-implantation development, and its subsequent implantation into the uterine wall. The subsequent placenta development ensures adequate fetal nutrition and oxygenation, with the trophoblast being the first cell lineage to differentiate during this process. The placenta sustains the growth of the fetus by providing it with oxygen and nutrients and removing waste products. It is not surprising that issues with the early development of the placenta can lead to common pregnancy disorders, such as recurrent miscarriage, fetal growth restriction, pre-eclampsia, and stillbirth. Understanding the normal development of the human placenta is essential for recognizing and contextualizing any pathological aberrations that may occur. The effects of these issues may not become apparent until later in pregnancy, during the mid or advanced stages. This review discusses the process of the embryo implantation phase, the molecular mechanisms involved, and the abnormalities in those mechanisms that are thought to contribute to the development of pre-eclampsia. The review also covers the histological hallmarks of pre-eclampsia as found during the examination of placental tissue from pre-eclampsia patients.

Publisher

MDPI AG

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