Related Experiment Videos
[Immune tolerance in pregnancy. Maternal-fetal interactions]
V Spina1, V Aleandri, A Pacchiarotti
1I Istituto di Clinica Ostetrica e Ginecologica, Università degli Studi di Roma La Sapienza.
Minerva Ginecologica
|March 9, 1999
Summary
Maternal immune tolerance prevents rejection of the semi-allogenic fetus during pregnancy. Key mechanisms include fetal-placental hormones like progesterone, altered immune cell activity, and specific molecular expressions.
Area of Science:
- Reproductive Immunology
- Maternal-Fetal Medicine
- Immunology
Context:
- The conceptus is a semi-allogenic graft, sharing paternal genetic material.
- Physiological rejection of the conceptus does not occur during pregnancy.
- Mechanisms of maternal immune tolerance to the fetus are complex and not fully understood.
Purpose:
- To explore the multifaceted mechanisms underlying maternal immune tolerance to the conceptus.
- To highlight key factors identified in animal and in vitro studies.
- To discuss the role of immune cells, molecular expressions, and hormones in preventing fetal rejection.
Summary:
- Maternal immune tolerance involves multiple interacting mechanisms.
- Factors include fetal anatomical position, lack of Major Histocompatibility Complex (MHC) expression on trophoblast, blocking antibodies, immune response modification, and immunosuppressive substances.
- Pregnancy-associated immune changes include reduced Natural Killer (NK) cell activity and a shift towards Th2 cytokines, altering the Th1/Th2 balance.
- Progesterone, via Progesterone Induced Blocking Factor (PIBF), is implicated in immunosuppression.
Impact:
- Understanding these mechanisms is crucial for managing pregnancy complications.
- Further research is needed to elucidate the precise contribution of each factor in humans.
- This knowledge can inform strategies for improving reproductive health outcomes.