Characterization Of Sendai Virus-Induced Human Placental Trophoblast Interferons

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Abstract
Human placental trophoblast cultures produce a mixture of interferons (IFNs) when challenged with Sendai virus. High-performance dye-ligand and immunoaffinity chromatography of a trophoblast IFN (tro-IFN) preparation enabled the isolation of three antigenically distinct IFNs, αI, αII1 and β, with M rs of 16K, 22K and 24K respectively, by reducing and non-reducing SDS-PAGE. The major IFN, responsible for 75% of the total antiviral activity, was tro-IFN-β, with the remaining activity being due to tro-IFN-αI and tro-IFN-αII1, as determined by an antiviral neutralization test using specific anti-human IFN antibodies. The antiviral activities of the tro-IFNs were stable at pH 2·0 for 24 h and tro-IFN-αII1 and -β were shown to be glycoproteins. The three tro-IFNs showed different antiviral activities when assayed on human and bovine cell species; tro-IFN-αI and -αII1 protected both human and bovine (MDBK) cells from virus infection, whereas tro-IFN-β showed a high degree of species specificity, protecting only the human cell types tested.

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