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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Transcytosis is the process in which molecules are internalized by endocytosis, transported across the cell, and released through exocytosis from the opposite end of the cell. Molecules such as insulin, immunoglobulins, and certain nutrients are transferred through the recycling endosomes by recycling and transcytosis.
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Updated: Nov 17, 2025

Human Placental and Decidual Organ Cultures to Study Infections at the Maternal-fetal Interface
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Molecular and immunological developments in placentas.

Akitoshi Nakashima1, Tomoko Shima1, Aiko Aoki1

  • 1Department of Obstetrics and Gynecology, Faculty of Medicine, University of Toyama, Toyama, Japan.

Human Immunology
|February 14, 2021
PubMed
Summary
This summary is machine-generated.

Maternal-fetal tolerance, crucial for normal pregnancy, involves specialized placental cells called trophoblasts interacting with maternal immune cells. Disruptions in this intricate placental development can lead to serious pregnancy complications.

Keywords:
AutophagyPlacentaRegulatory T cellsSenescenceSyncytialization

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Area of Science:

  • Reproductive Biology
  • Immunology
  • Developmental Biology

Background:

  • Trophoblasts, including syncytiotrophoblasts (STBs) and extravillous trophoblasts (EVTs), are key cells in early placental development.
  • The maternal-fetal interface is where trophoblasts interact with maternal immune cells.
  • Maternal-fetal tolerance prevents rejection of the semi-allogeneic fetus and placenta during pregnancy.

Purpose of the Study:

  • To review placental development from a molecular biology perspective.
  • To discuss the role of trophoblast differentiation and interaction with maternal immunity in establishing pregnancy tolerance.
  • To explore how disruptions in placental development can cause pregnancy complications.

Main Methods:

  • This is a review article, synthesizing existing knowledge.
  • Focuses on molecular biology mechanisms underlying placental development and maternal-fetal interactions.
  • Literature review on trophoblast differentiation, immune tolerance, and pregnancy disorders.

Main Results:

  • Normal placentation involves trophoblast differentiation and establishment of maternal-fetal tolerance.
  • Acquired maternal-fetal tolerance is essential for successful fetal development.
  • Disrupted placental development is linked to pregnancy complications like hypertensive disorders, fetal growth restriction, and miscarriage.

Conclusions:

  • Understanding placental development at the molecular level is key to comprehending maternal-fetal tolerance.
  • Aberrant placental development and immune interactions can precipitate adverse pregnancy outcomes.
  • Further research into these mechanisms may offer insights into managing pregnancy complications.