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RNA. Nov 2001; 7(11): 1578–1588.
PMCID: PMC1370200

Cellular mutants define a common mRNA degradation pathway targeting cytokine AU-rich elements.

Abstract

To functionally classify AU-rich elements (AREs) from six different cytokine mRNAs, we made use of two previously described HT1080-derived cellular mutants (slowA, slowC) that lack a function required for the rapid degradation of interleukin-3 (IL-3) mRNA. Here we show that the defect is specific for ARE-containing mRNAs, whereas nonsense-mediated decay is intact. Degradation of beta-globin reporter transcripts mediated by the AREs of IL-3, GM-CSF, and TNFalpha, as well as by the structurally different and less potent AREs of IL-2 and IL-6, is impaired in both mutants. All these reporter transcripts are also sensitive to decay induced by ectopic expression of the RNA-binding protein tristetraprolin in the slowC background. Thus, we concluded that the mutants slowA and slowC define a common mRNA degradation pathway that targets cytokine AREs. In NIH3T3 cells, this decay pathway becomes incapacitated by upstream signaling from p38 MAP- or PI3-kinases, which independently stabilize cytokine ARE-containing transcripts. In contrast, c-fos ARE-directed mRNA degradation proceeds through a different pathway not affected by these kinases.

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Selected References

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