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. 1982 Dec;2(12):1472–1480. doi: 10.1128/mcb.2.12.1472

Initial Characterization of a Spontaneous Interferon Secreted During Growth and Differentiation of Friend Erythroleukemia Cells

Miriam Friedman-Einat Michel Revel 1, Adi Kimchi 1
PMCID: PMC369956  PMID: 14582189

Abstract

A gradual increase in the level of 2′,5′-oligoadenylate synthetase takes place in Friend erythroleukemia cells after a shiftdown in the rate of cell growth. The increase is about 5-fold after entry of cells into the stationary phase of growth, but much higher (25-fold) when reduction in growth accompanies cell differentiation. In the latter case, the enzyme increase is similar to that which can be induced in these cells by exogenous interferon (IFN). The increase in 2′,5′-oligoadenylate synthetase was shown to be due to a spontaneous secretion of IFN by the cells themselves: it is completely abolished if antiserum to murine type I IFN is added to the culture medium. In attempts to isolate some of this spontaneously secreted IFN, we show that it is stable at pH 2, not neutralized by antiserum to type II IFN, and that it also differs from the known IFN species induced by Sendai virus in Friend cells. The major component of this spontaneously secreted IFN is 20,000 Mr and differs from the corresponding virus-induced 20,000-Mr IFN by its lower affinity for antiserum to type I IFN and its antigenic characterization as β-murine IFN. The major component of the spontaneous IFN also exhibits a higher ratio of antigrowth to antiviral activity than the Sendai-induced IFNs. We suggest that Friend cells produce this specific type of IFN for the regulation of their growth and differentiation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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