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Interferon-alpha-(IFN) producing CHO cell lines are resistant to the antiproliferative activity of IFN: a correlation
M van Heuvel1, M Govaert-Siemerink, I J Bosveld
1Department of Pathology, Erasmus University, Rotterdam, The Netherlands.
Abstract:
CHO cell lines that constitutively produce the murine interferon-alpha (IFN-alpha) subspecies alpha 4 and alpha 6 were constructed. The producer cell lines were protected against viral (vesicular stomatitis virus) infection by the IFN species secreted, but were resistant to the growth inhibitory activity of the IFN species. As compared with alpha 4, the alpha 6 protein displayed a high antiproliferative activity when added to normal CHO cells, which correlates completely with the high antiviral activity of alpha 6 on these cells. Three messenger ribonucleic acid (mRNA) species, which are normally induced in CHO cells by IFN treatment (1-8, 2-5A synthetase, and ISG 15) were constitutively present in CHO producer cell lines. The level of another mRNA (ISG 54), however, was very low in the producer cells as compared with its expression in short-term IFN-treated cells. These data indicate that 1-8, 2-5A synthetase and ISG 15 are not involved in the antigrowth activity of IFN in this system, but rather suggest a function of ISG 54 in this respect.
Insights
Researchers engineered Chinese hamster ovary (CHO) cells to produce interferon-alpha (IFN-alpha). These cells showed protection against viral infection but resisted IFN-alpha
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Interferon-alpha (IFN-alpha) is crucial for antiviral defense.
- Understanding IFN-alpha's diverse effects on cell growth and gene expression is vital.
Purpose of the Study:
- To investigate the distinct roles of IFN-alpha subspecies (alpha 4 and alpha 6) in Chinese hamster ovary (CHO) cells.
- To determine the involvement of specific interferon-stimulated genes (ISGs) in IFN-alpha's antiproliferative effects.
Main Methods:
- Construction of CHO cell lines constitutively producing murine IFN-alpha 4 and alpha 6.
- Assessment of antiviral and antiproliferative activities of secreted IFNs.
- Quantification of interferon-stimulated gene (ISG) mRNA levels (1-8, 2-5A synthetase, ISG 15, ISG 54) in producer and control cells.
Main Results:
- CHO producer cells were protected from viral infection but resistant to growth inhibition by secreted IFNs.
- IFN-alpha 6 exhibited higher antiproliferative and antiviral activity than IFN-alpha 4 in normal CHO cells.
- Constitutive expression of 1-8, 2-5A synthetase, and ISG 15 mRNA was observed in producer cells, while ISG 54 mRNA levels were low.
Conclusions:
- Secreted IFN-alpha subspecies confer antiviral protection but not self-inhibition of growth in producer CHO cells.
- ISG 54 may play a role in mediating the antiproliferative effects of IFN-alpha, whereas 1-8, 2-5A synthetase, and ISG 15 do not appear to be involved in this specific context.