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Related Experiment Videos

The maternal immune system's interaction with circulating fetal cells

E A Bonney1, P Matzinger

  • 1Laboratory of Cellular and Molecular Immunology, National Institute of Allergy and Infectious Disease, Bethesda, Maryland 20892, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|January 1, 1997
PubMed
Summary

Female mice tolerate fetuses from male donors, but past theories suggested fetal cells in maternal circulation. This study found fetal cell migration is infrequent and these cells are cleared by the mother's immune system.

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Area of Science:

  • Immunology
  • Reproductive Biology

Background:

  • Female mammals typically reject foreign tissue, including organ transplants from males.
  • Pregnancy involves a unique maternal-fetal relationship where rejection is avoided.

Purpose of the Study:

  • To investigate the frequency and extent of fetal cell migration into maternal circulation.
  • To understand the maternal immune system's interaction with fetal cells during pregnancy.

Main Methods:

  • Quantitative PCR (qPCR) used to detect and quantify male fetal cells in maternal tissues and blood.
  • Analysis of normal and SCID (severe combined immunodeficiency) mice during pregnancy.
  • Kinetic analysis of cell migration and clearance in syngeneic and allogeneic pregnancies.

Main Results:

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  • Fetal cell migration from fetus to mother is not a universal occurrence during pregnancy.
  • Migrating fetal cells are detected in a fraction of pregnancies.
  • The maternal immune system actively clears these fetal cells without harming the fetus.

Conclusions:

  • Fetal cell migration is not the primary mechanism for maternal immune tolerance of the fetus.
  • The maternal immune system possesses a capacity to eliminate circulating fetal cells.
  • Tolerance is established through mechanisms other than continuous fetal cell exposure.