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. 1982 Nov;2(11):1436–1443. doi: 10.1128/mcb.2.11.1436

Induction and maintenance of 2',5'-oligoadenylate synthetase in interferon-treated chicken embryo cells.

D K West, L A Ball
PMCID: PMC369948  PMID: 6186904

Abstract

Treatment of primary cultures of chicken embryo cells with homologous interferon results in a substantial increase in the level of 2',5'-oligoadenylate synthetase activity that can be detected in cell extracts. This increase can be prevented by inhibitors of RNA or protein synthesis and is thus thought to represent the induction of an interferon-inducible gene, perhaps the 2',5'-oligoadenylate synthetase gene itself. To examine this response in greater detail, we studied its kinetics under the following conditions: (i) cessation of interferon treatment after different lengths of time, (ii) delayed inhibition of RNA or protein synthesis, and (iii) combinations of these treatments. The results showed that in cells treated continuously with interferon, the enzyme level reached a peak after 9 h of treatment and then decreased with a half-life of about 30 h, despite the continued presence of interferon. Removal of interferon during induction reduced the peak level of activity that was attained and somewhat accelerated its decline but did not otherwise affect the time-course of the response. On the other hand, removal of interferon after maximum induction clearly accelerated the decay of enzyme activity. This process could be delayed by inhibitors of protein synthesis, which effectively stabilized the induced enzyme. This behavior is reminiscent of other inducible enzymes, such as the steroid-induced tyrosine aminotransferase, and suggests that the level of 2',5'-oligoadenylate synthetase, which is also inducible by steroid hormones in some cell types, is subject to similar control mechanisms.

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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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