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Placental interferons

F W Bazer1, T E Spencer, T L Ott

  • 1Department of Animal Science, Texas A&M University, College Station, USA.

American Journal of Reproductive Immunology (New York, N.Y. : 1989)
|April 1, 1996
PubMed
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Ruminant embryos produce interferon tau (IFN tau) to signal pregnancy, preventing uterine luteolysis. Pigs utilize estrogen and interferons, possibly via shared JAK signaling pathways, to maintain pregnancy.

Area of Science:

  • Reproductive biology
  • Endocrinology
  • Developmental biology

Background:

  • Pregnancy recognition is crucial for maternal-fetal communication and successful gestation.
  • Interferons (IFNs) are key signaling molecules in early pregnancy in various species.
  • Species-specific mechanisms regulate pregnancy maintenance by preventing luteolysis.

Purpose of the Study:

  • To elucidate the role of conceptus-secreted interferons in pregnancy recognition in ruminants.
  • To investigate the signaling pathways involved in pregnancy maintenance in pigs.
  • To compare IFN roles in pregnancy across different mammalian species.

Main Methods:

  • Review of existing literature on interferon tau (IFN tau) in ruminant pregnancy.
  • Analysis of pig conceptus signaling molecules, including estrogen and interferons.

Related Experiment Videos

  • Exploration of shared cell-signaling pathways, such as Janus kinases (JAKs).

    • Main Results:

    • Ruminant conceptuses secrete IFN tau for pregnancy recognition, suppressing estrogen and oxytocin receptors to inhibit prostaglandin F2 alpha (PGF) release.
    • Pig conceptuses secrete IFN alpha and IFN gamma; estrogen increases endometrial prolactin receptors and PGF secretion.
    • Shared JAK signaling pathways may link IFNs and lactogenic hormones to prevent luteolysis in pigs.

    Conclusions:

    • Interferon tau is essential for pregnancy recognition in ruminants, ensuring corpus luteum maintenance.
    • Pigs employ distinct mechanisms involving estrogen and potentially IFNs for pregnancy maintenance.
    • Convergent signaling pathways highlight conserved strategies for establishing pregnancy across mammals.