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. 1994 Nov;1(6):650–659. doi: 10.1128/cdli.1.6.650-659.1994

Production of interferons in human placental trophoblast subpopulations and their possible roles in pregnancy.

G Aboagye-Mathiesen 1, F D Tóth 1, M Zdravkovic 1, P Ebbesen 1
PMCID: PMC368383  PMID: 8556516

Abstract

The human cytotrophoblasts are the first fetal cells to arise during embryogenesis and are the progenitor cells to villous (noninvasive), syncytiotrophoblast (noninvasive), "intermediate" extravillous (invasive), and "anchoring" extravillous (invasive) trophoblast subpopulations. These trophoblast subpopulations were isolated from first- and third-trimester placentae and were stimulated with Sendai virus, granulocyte-macrophage colony-stimulating factors (GM-CSF), and platelet-derived growth factor (PDGF) to produce interferons (IFNs). GM-CSF and PDGF induced very low levels of IFN in first-trimester extravillous and villous trophoblast subpopulations. Highly proliferating and invasive intermediate extravillous trophoblast cultures produced five- to eightfold more IFNs than villous trophoblast cultures and two- to fivefold more IFN than the syncytiotrophoblast cultures when stimulated with Sendai virus. Syncytiotrophoblast cultures produced higher levels of IFNs (up to twofold) than villous trophoblast cultures when stimulated with the same virus. Pretreatment of first-trimester extravillous and villous trophoblast cultures with GM-CSF and PDGF followed by infection with Sendai virus resulted in greater IFN production than when the cultures were stimulated with virus alone. The levels of IFN produced were dependent on the type of trophoblast, the type of inducer, and the stage of differentiation of the trophoblasts. The purified trophoblast IFNs have potent antiviral activities when assayed on human amniotic WISH cells, and they inhibited proliferation of normal trophoblasts and trophoblast-derived malignant cells in vitro without any toxicity. Furthermore, the trophoblast IFNs activated NK cell activity and suppressed mitogen-stimulated lymphocyte proliferation at concentrations of between 10 and 1,000 IU/ml. The possible functions of the trophoblast IFNs during pregnancy are discussed with respect to human placental and fetal protection and development.

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Selected References

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