Localization of IL-4 and IL-4 receptors in the human term placenta, decidua and amniochorionic membranes

Immunology. 1997 Jan;90(1):87-94. doi: 10.1046/j.1365-2567.1997.00139.x.

Abstract

There has been much recent interest in cytokine expression at the materno-fetal interface. Although T-helper 2 (Th2)-type cytokines have been described in the murine feto-placental unit, few studies have as yet been performed in human pregnancy. We have examined the production of interleukin-4 (IL-4) and expression of IL-4 receptors in the human term placenta, decidua and amniochorionic membranes. Immunohistochemical analyses revealed that cytotrophoblast, decidual macrophages and both maternal and fetal endothelial cells consistently expressed IL-4, whereas syncytiotrophoblast and placental macrophages showed an inconsistent pattern between specimens. High- and low-affinity IL-4 receptors were demonstrated by immunohistochemistry at the same cellular sites as stained for IL-4, and detection of IL-4 receptors was also variable in syncytiotrophoblast. Reverse-transcribed-polymerase chain reaction (RT-PCR) analysis showed that both IL-4 and its alternative splice variant, IL-482, are produced both in placental villi and in amniochorionic and decidual tissue. Ligand-binding assays identified the presence, on isolated term syncytiotrophoblast microvillous plasma membrane vesicle preparations, of functional high-affinity binding sites for IL-4 with a Kd in the range 102-112 pM and an apparent receptor density in the range 99-102 x 10(8) sites/mg protein. Three human choriocarcinoma (BeWo, JEG-3 and Jar) and one amnion-derived (AV3) cell lines expressed IL-4 and both high- and low-affinity IL-4 receptors. The constitutive expression of both IL-4 and IL-4 receptors, together with the novel finding of the alternative splice variant IL-482 in the immediate tissues at the materno fetal interface suggest an immunobiological role for IL-4 in human pregnancy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigens, CD / biosynthesis*
  • Cell Line
  • Decidua / immunology*
  • Extraembryonic Membranes / immunology*
  • Female
  • Gene Expression
  • Humans
  • Immunoenzyme Techniques
  • Interleukin-4 / biosynthesis*
  • Interleukin-4 / genetics
  • Placenta / immunology*
  • Polymerase Chain Reaction
  • Pregnancy
  • RNA, Messenger / genetics
  • Receptors, Interleukin / biosynthesis*
  • Receptors, Interleukin-4

Substances

  • Antigens, CD
  • RNA, Messenger
  • Receptors, Interleukin
  • Receptors, Interleukin-4
  • Interleukin-4